WO2019021762A1 - Dispositif de mesure de quantité physique et dispositif de commande de mesure - Google Patents

Dispositif de mesure de quantité physique et dispositif de commande de mesure Download PDF

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Publication number
WO2019021762A1
WO2019021762A1 PCT/JP2018/025186 JP2018025186W WO2019021762A1 WO 2019021762 A1 WO2019021762 A1 WO 2019021762A1 JP 2018025186 W JP2018025186 W JP 2018025186W WO 2019021762 A1 WO2019021762 A1 WO 2019021762A1
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WO
WIPO (PCT)
Prior art keywords
housing
detection unit
physical quantity
measurement
passage
Prior art date
Application number
PCT/JP2018/025186
Other languages
English (en)
Japanese (ja)
Inventor
順三 山口
昇 北原
寛 田川
真樹 井上
基 眞下
崇 榎本
Original Assignee
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017247429A external-priority patent/JP2019023610A/ja
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to DE112018003773.8T priority Critical patent/DE112018003773T5/de
Publication of WO2019021762A1 publication Critical patent/WO2019021762A1/fr
Priority to US16/749,504 priority patent/US20200158550A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow

Definitions

  • the disclosure of this specification relates to a physical quantity measuring device and a measurement control device.
  • Patent Document 1 discloses a physical quantity measuring apparatus for measuring the flow rate of intake air drawn into an internal combustion engine as a physical quantity measuring apparatus for measuring a physical quantity of fluid.
  • the physical quantity measuring device has a main passage for passing the inflowing fluid and a bypass passage branched from the main passage, and a flow rate detection unit for outputting a detection signal according to the flow rate of the intake air serves as a bypass passage. It is provided.
  • the main object of the present disclosure is to provide a physical quantity measuring device and a measurement control device capable of enhancing the measurement accuracy of the physical quantity.
  • a first aspect of the present disclosure is a physical quantity measuring device that measures a physical quantity of fluid.
  • the physical quantity measuring device forms a measurement flow path through which the fluid to be measured flows, and a measurement flow path, and a housing that is attached to the installation target while at least a part of the flow enters the inside of the predetermined installation target,
  • a physical quantity detection unit that detects the physical quantity of fluid in the flow path, and a physical quantity of the same type as the physical quantity detected by the physical quantity detection unit is detected inside the housing as a correction parameter used to correct the detection result of the physical quantity detection unit
  • the physical quantity detection unit is provided at a position included in the entry portion.
  • the same type detection unit is a physical quantity measuring device provided at a position closer to the protruding part than the physical quantity detecting unit in the direction in which the entering part and the protruding part are aligned.
  • the same kind detection unit is provided at a position closer to the external heat source than the physical quantity detection unit, application of heat indicating how much heat is applied from the external heat source The degree is likely to differ between the homogeneous detection unit and the physical quantity detection unit. Further, by using the detection result of the same type detection unit as a correction parameter to correct the detection result of the physical amount detection unit, it is possible to obtain the measured value of the physical amount. In this case, the difference between the heat application degree is easily reflected in the difference between the detection result of the same type detection unit and the detection result of the physical amount detection unit, thereby making an error between the measured value of the physical amount and the actual physical amount. Can be made smaller. Therefore, the measurement accuracy of the physical quantity can be enhanced.
  • a second aspect of the present disclosure is a measurement control device that controls a physical quantity measurement device.
  • the physical quantity measuring device forms a measurement flow path through which a fluid to be measured flows, and a measurement flow path, and a housing that can be attached to a mounting target in a state in which at least a part is inserted into the inside of a predetermined mounting target
  • a physical quantity detection unit that detects a physical quantity of fluid in the flow channel, a homogeneous detection unit that detects a physical quantity of the same type as the physical quantity detected by the physical quantity detection unit, inside the housing; And a protruding portion that protrudes outside the mounting object without entering the mounting object.
  • the physical quantity detection unit is provided at a position included in the entry portion.
  • the same type detection unit is provided at a position closer to the protruding portion side than the physical quantity detection unit in the direction in which the entering portion and the protruding portion are aligned.
  • the measurement control device includes a physical quantity correction unit that corrects the detection result of the physical quantity detection unit based on the detection result of the homogeneous detection unit.
  • the detection result of the physical quantity detection unit is corrected based on the correction result of the same type detection unit, the measurement accuracy of the physical quantity can be enhanced as in the first embodiment.
  • a third aspect of the present disclosure is a measurement control device that controls a physical quantity measurement device.
  • the physical quantity measuring device forms a measurement flow path through which a fluid to be measured flows, a measurement flow path, a housing attached to a predetermined attachment target, and a physical quantity detection unit that detects a physical quantity of fluid in the measurement flow path And.
  • the measurement control device includes a change correction unit that corrects the detection result of the physical amount detection unit based on the change mode of the detection result of the physical amount detection unit.
  • the detection result of the physical quantity detection unit corresponds to the actual physical quantity
  • the change correction unit predicts the change mode of the detection result. . Therefore, compared to the time required for the detection result of the physical quantity detection unit to correspond to the actual physical quantity, the time required for the correction result of the change correction unit to correspond to the actual physical quantity is shortened. be able to. Therefore, the response delay of physical quantity measurement can be suppressed, and as a result, the measurement precision of physical quantity can be raised.
  • the schematic diagram for demonstrating the structure of the combustion system in 1st Embodiment The front view of the air flow meter of the state attached to the intake pipe. The top view of the air flow meter of the state attached to the intake pipe. The perspective view of the airflow meter which looked at the upstream end surface of the airflow meter. The perspective view of the airflow meter which looked at the downstream end surface of the airflow meter. The side view which looked at the air flow meter from the connector part side. The side view which looked at the air flow meter from the opposite side to the connector part. VIII-VIII sectional view taken on the line of FIG. The enlarged view of the measurement flow path periphery of FIG. The front view which shows the structure of sensor SA.
  • FIG. 10 is a cross-sectional view of the sensor SA showing a state before being inserted into the housing.
  • the longitudinal cross-sectional view which shows the internal structure of sensor SA.
  • the perspective view which shows the internal structure of a sealing area
  • mold apparatus The figure for demonstrating shaping
  • FIG. 1 The XXXI-XXXI sectional view taken on the line of FIG.
  • FIG. The figure for demonstrating shaping
  • FIG. 2 is a block diagram showing an electrical configuration of a temperature correction unit. The figure for demonstrating the process in a 1st correction
  • the figure which shows the relationship between a flow signal and a time constant The figure which shows each time change when the flow rate is large about the 1st correction signal, and when the flow rate is small.
  • the figure which shows each time change of a 1st temperature signal and a 1st correction signal The figure which shows each time change of the 1st temperature signal and the 2nd temperature signal.
  • the figure which shows each time change of a temperature difference signal and a difference correction signal The figure which shows the relationship between a temperature difference signal and a difference correction signal.
  • FIG. 10 is a cross-sectional view of a housing around a detection diaphragm in a second embodiment. The cross-sectional view of the housing around a vertical partition wall. The cross-sectional view of the airflow meter around housing protrusion in 3rd Embodiment.
  • FIG. 18 is a perspective view of a first restricting portion in the configuration group C. The enlarged view of the flow volume detection part periphery in FIG. FIG.
  • FIG. 70 is a cross-sectional view taken along line LXXI-LXXI of FIG. 70; The longitudinal cross-sectional view of the air flow meter in the component groups E and F.
  • FIG. The front view of the air flow meter in the configuration group G.
  • FIG. The LXXV-LXXV line sectional view of FIG. 74.
  • FIG. 6th Embodiment and structural group E The figure which shows the state which removed the measurement shaping
  • FIG. shows the state which removed the passage type
  • FIG. The figure for demonstrating attachment of sensor SA to a housing.
  • molding part in a modification D2, and a passage mold part The longitudinal cross-sectional view of the housing around the passage channel in modification D4.
  • the longitudinal cross-sectional view of the housing in the modification E6 The side view of a housing.
  • the longitudinal cross-sectional view of a housing. The enlarged view of the lip periphery in the modification F2.
  • the enlarged view of the lip periphery in the modification F5. Enlarged view around the lip.
  • FIG. 13 is a block diagram showing an electrical configuration of a temperature correction unit in a modified example H2.
  • FIG. 16 is a block diagram showing an electrical configuration of a temperature correction unit in a modified example H3.
  • FIG. 16 is a block diagram showing an electrical configuration of a temperature correction unit in a modified example H4.
  • FIG. 18 is a block diagram showing an electrical configuration of a temperature correction unit in modification H5, H7.
  • FIG. 18 is a block diagram showing an electrical configuration of a temperature correction unit in Modifications H6 and H7.
  • the combustion system 10 shown in FIG. 1 has an internal combustion engine 11 such as a gasoline engine, an intake passage 12, an exhaust passage 13, an air flow meter 14 and an ECU 20, and is mounted on a vehicle, for example.
  • the air flow meter 14 is provided in the intake passage 12 and has a function of measuring a physical quantity such as the flow rate, temperature, humidity, and pressure of the intake air supplied to the internal combustion engine 11.
  • the airflow meter 14 corresponds to a physical quantity measuring device that measures intake air as a fluid.
  • the intake air is a gas supplied to the combustion chamber 11 a of the internal combustion engine 11. In the combustion chamber 11 a, the mixture of the intake air and the fuel is ignited by the spark plug 17.
  • the ECU (Engine Control Unit) 20 is a control device that controls the operation of the combustion system 10.
  • the ECU 20 is an arithmetic processing circuit configured by a processor, a storage medium such as a RAM, a ROM, and a flash memory, a microcomputer including an input / output unit, a power supply circuit, and the like.
  • the ECU 20 receives sensor signals output from the air flow meter 14, sensor signals output from a number of on-vehicle sensors, and the like.
  • the ECU 20 performs engine control on a fuel injection amount, an EGR amount, and the like of the injector 16 using a measurement result by the air flow meter 14.
  • the ECU 20 is a control device that controls the operation of the internal combustion engine 11, and the combustion system 10 can also be referred to as an engine control system. Also, the ECU 20 corresponds to an external device.
  • the airflow meter 14 is one of many measurement units included in the combustion system 10.
  • an air-fuel ratio sensor 18 or the like is provided as a measurement unit in the intake system and the exhaust system of the internal combustion engine 11.
  • the air flow meter 14 is disposed downstream of the air cleaner 19 in the intake passage 12 and upstream of the throttle valve 15.
  • the air cleaner 19 side of the air flow meter 14 in the intake passage 12 is on the upstream side
  • the combustion chamber 11a side is on the downstream side.
  • the air flow meter 14 shown in FIGS. 2 and 3 is detachably attached to the intake pipe 12 a forming the intake passage 12.
  • the air flow meter 14 is inserted into an air flow insertion hole 12 b formed to penetrate the cylindrical wall of the intake pipe 12 a, and at least a part of the air flow meter 14 is positioned in the intake passage 12.
  • the intake pipe 12a has a pipe flange 12c extending outward from the airflow insertion hole 12b, and includes a pipe formed of a synthetic resin material or the like.
  • the tube flange 12c extends along the peripheral edge of the airflow insertion hole 12b, and has, for example, an annular shape.
  • the tip end surface of the pipe flange 12c extends in a direction perpendicular to the center line of the pipe flange 12c. In this case, the tip end surface of the pipe flange 12 c extends in the longitudinal direction of the intake passage 12, that is, in the direction in which the intake air flows in the intake passage 12.
  • the intake pipe 12a corresponds to the mounting object.
  • the air flow meter 14 has a housing 21, a flow rate detection unit 22 (see FIG. 8), and an intake air temperature sensor 23.
  • the housing 21 is formed of, for example, a resin material or the like. In the air flow meter 14, the housing 21 is attached to the intake pipe 12 a so that the flow rate detection unit 22 can be in contact with the intake air flowing through the intake passage 12.
  • the housing 21 has a housing body 24, a ring holding portion 25, a flange portion 27, a connector portion 28, a root portion 29 a and a protection projection 29 b, and the O ring 26 is attached to the ring holding portion 25.
  • the housing main body 24, the ring holding portion 25, the flange portion 27, the connector portion 28, the root portion 29a and the protective projection 29b are manufactured by one resin molding process described later in order to realize cost reduction.
  • the housing body 24 is formed in a cylindrical shape as a whole, and in the housing 21, the ring holding portion 25, the flange portion 27, the connector portion 28, the root portion 29a and the protection projection 29b It is in a state of being provided integrally with 24.
  • the housing body 24 extends in the height direction Y when the width direction X, the height direction Y and the depth direction Z of the air flow meter 14 are defined, and the ring holding portion 25 and the flange portion 27 extend in the width direction from the housing body 24. It extends in the X and depth directions Z.
  • the ring holding portion 25, the flange portion 27, and the connector portion 28 are disposed on the proximal end side of the housing 21 with respect to the housing main body 24.
  • the proximal end side of the housing 21 is also referred to as a housing proximal end side
  • the distal end side of the housing 21 is also referred to as a housing distal end side. That is, in the height direction Y, the housing base end surface 192 (figure) side described later is referred to as the housing base end side, and the housing tip end surface 191 side is referred to as the housing tip end side.
  • the housing proximal end surface 192 can be referred to as the proximal end or proximal end of the housing 21, and the housing distal end surface 191 can be referred to as the distal end or distal end of the housing 21.
  • the width direction X, the height direction Y and the depth direction Z are orthogonal to each other.
  • the ring holding portion 25 is a portion that is internally fitted to the airflow insertion hole 12 b via the O-ring 26.
  • the ring holding portion 25 has a holding groove 25a which is made along the circumference of the housing main body 24, and holds the O ring 26 in a state where the O ring 26 is inserted into the holding groove 25a.
  • the ring holding portion 25 has a pair of groove forming portions projecting in the width direction X and the depth direction Z, and these groove forming portions are separated in the height direction Y, so that there is a space between these groove forming portions.
  • the holding groove 25a is formed in the.
  • a pair of groove formation part can also be called a seal
  • the O-ring 26 is a member that seals the intake passage 12 and the outside of the intake pipe 12 a.
  • the O-ring 26 is externally fitted to the ring holding portion 25 and is interposed between the ring holding portion 25 and the airflow insertion hole 12 b in a state where the O-ring 26 enters the inner peripheral side of the pipe flange 12 c.
  • the flange portion 27 is disposed closer to the housing base end than the ring holding portion 25 and covers the airflow insertion hole 12b from the outer peripheral side of the intake pipe 12a. In addition, the flange portion 27 can be caught on the tip end portion of the pipe flange 12 c of the intake pipe 12 a, thereby restricting the housing 21 from excessively entering the intake passage 12.
  • the connector portion 28 is a portion surrounding the plurality of connector terminals 28a (see FIG. 6), and corresponds to a terminal protection portion that protects the connector terminals 28a.
  • the plug portion is inserted into the connector portion 28.
  • the plug portion is provided at an end of a connection line electrically connected to the ECU 20 directly or indirectly, and is fitted with the connector portion 28.
  • the housing 21 is provided with a plurality of light theft portions 41 for improving the dimensional accuracy after molding and reducing the weight.
  • the meat theft portion 41 is provided, for example, in the flange portion 27, the housing main body 24, and the ring holding portion 25. Further, when the housing 21 is resin-molded, the thickness of the housing 21 is appropriately reduced by the meat theft portion 41, which makes it difficult to generate a portion where the molten resin does not rotate in the mold portion such as a mold. In addition, it is possible to suppress the deterioration in the dimensional accuracy that occurs due to the resin component cooling and shrinking after molding.
  • a plurality of screw holes 42 are formed in the flange portion 27, and the housing 21 is fixed to the intake pipe 12 a using the screw holes 42.
  • the intake pipe 12a is provided with a boss 12d to which a screw member (not shown) penetrating the screw hole 42 is attached, and the flange portion 27 is supported by the boss 12d.
  • the boss 12 d extends from the outer peripheral surface of the intake pipe 12 a along the pipe flange 12 c and is disposed at a position separated from the pipe flange 12 c.
  • the boss 12 d may be integrally provided on the pipe flange 12 c.
  • the root portion 29a protrudes from the ring holding portion 25 toward the front end of the housing in the height direction Y, and from the housing main body 24 in the width direction X to avoid the influence of heat of the housing main body 24 receiving heat from the engine and temperature rise. It is disposed at a position spaced apart.
  • the intake air temperature sensor 23 has a temperature sensitive element 23a for sensing the temperature of intake air, a pair of lead wires 23b extending from the temperature sensitive element 23a, and a pair of intake air temperature terminals 23c connected to the lead wire 23b. ing.
  • the pair of intake air temperature terminals 23c extends from the root portion 29a, and the temperature sensing element 23a is in a state of being passed over the pair of intake air temperature terminals 23c via the pair of lead wires 23b.
  • the lead wire 23b and the intake air temperature terminal 23c both have conductivity, and the intake air temperature terminal 23c is electrically connected to a connector terminal 28a (see FIG. 18) provided in the connector portion 28.
  • the intake air temperature terminal 23c may be connected to a bridge terminal 86 described later.
  • the lead wire 23b and the intake air temperature terminal 23c may be integrated as another embodiment.
  • the intake air temperature sensor 23 outputs a detection signal corresponding to the intake air temperature sensed by the temperature sensing element 23a.
  • the protective projection 29 b protrudes laterally from the housing main body 24 in the width direction X, and is disposed closer to the front end of the housing than the intake air temperature sensor 23.
  • the protrusion dimension of the protection projection 29 b from the housing main body 24 is larger than the separation distance of the intake air temperature sensor 23 from the housing main body 24.
  • the intake air temperature sensor 23 appears to overlap with the back side of the protective protrusion 29 b. Therefore, when the air flow meter 14 is attached to the intake pipe 12a and the housing 21 is inserted into the air flow insertion hole 12b, the outer peripheral surface of the intake pipe 12a is protected even if the insertion position of the housing 21 deviates in the width direction X.
  • the projection 29b will hit. Therefore, damage to the intake air temperature sensor 23 due to the intake air temperature sensor 23 hitting the outer peripheral surface of the intake pipe 12a is suppressed.
  • the housing body 24 forms a bypass flow passage 30 into which a part of the intake air flowing through the intake passage 12 flows.
  • the bypass flow passage 30 has a passage flow passage 31 and a measurement flow passage 32.
  • the passage flow passage 31 and the measurement flow passage 32 are formed by the internal space of the housing main body 24.
  • the passage channel 31 penetrates the housing main body 24 in the depth direction Z, and has an inlet 33a which is an upstream end and an outlet 33b which is a downstream end.
  • the measurement flow channel 32 is a branch flow channel branched from the middle portion of the passage flow channel 31, and has a measurement outlet 33c which is a downstream end.
  • the intake passage 12 may be referred to as a main passage
  • the bypass passage 30 may be referred to as a sub passage. Further, in FIG. 8, the illustration of the O-ring 26 is omitted.
  • the inlet 33a is provided on the upstream end surface thereof, and the outlet 33b is provided on the downstream end surface thereof. Further, in the housing main body 24, one measurement outlet 33c is provided on each of the both side surfaces.
  • the measurement outlets 33 c are elongated in the height direction Y and arranged in the width direction X.
  • the side surface of the housing body 24 has a flat surface 44 extending straight in the height direction Y and the depth direction Z, and the upstream end surface has a curved surface 45 curved so as to expand upward. ing.
  • the flat surface 44 and the curved surface 45 are adjacent to each other in the depth direction Z, and the measurement outlet 33 c is a position across the boundary between the flat surface 44 and the curved surface 45 in the depth direction Z on the side surface of the housing main body 24. It is arranged.
  • the measurement outlets 33 c in the configuration in which all of the measurement outlets 33 c are opened to the curved surface 45 of the upstream end surface, the measurement outlets 33 c easily receive the dynamic pressure on the upstream side of the intake passage 12. As a result, there is a concern that the flow rate flowing into the measurement flow passage 32 from the passage flow passage 31 may unintentionally decrease, or foreign matter such as dust may enter the measurement flow passage 32 from the measurement outlet 33 c.
  • the direction in which the intake air flowing along the flat surface 44 at the upstream end portion changes changes in the flat surface 44.
  • Peeling of intake air is likely to occur.
  • the measurement outlet 33 c receives the flow velocity in the measurement flow channel 32 to become unstable.
  • the dynamic pressure and intake air upstream of the intake passage 12 there is an advantage that the measurement outlet 33c is less susceptible to the influence of peeling.
  • the measurement outlet 33c is disposed at a position where the influence of the dynamic pressure received from the upstream side of the intake passage 12 and the influence of the gas flowing through the intake passage 12 are balanced. Further, the above merit is further increased by shortening the measurement outlet 33c in the depth direction Z as much as possible, and from the viewpoint of increasing this merit, the measurement outlet 33c is in the height direction as in the present embodiment. It is preferable that Y has an elongated shape.
  • the passage 31 includes an inflow passage 31a extending straight from the inlet 33a and an outflow passage 31b extending straight from the outlet 33b.
  • the inflow passage 31 a extends in the depth direction Z
  • the outflow passage 31 b extends in a direction inclined with respect to the depth direction Z.
  • the outflow passage 31b is inclined toward the housing proximal end toward the outlet 33b, whereby the outlet 33b is disposed at a position shifted to the housing proximal side relative to the inlet 33a. .
  • the passage 31 is narrowed as it approaches the outlet 33 b.
  • the passage 31 is configured so as not to be throttled even when it approaches the inlet 33 a from the outlet 33 b in the depth direction Z.
  • the flow passage area of the inflow passage 31 a is uniform in the depth direction Z.
  • both the height dimension in the height direction Y and the width dimension in the width direction X are uniform in the depth direction.
  • the cross-sectional area of the outflow passage 31 b gradually decreases as it approaches the outlet 33 b.
  • the width dimension gradually decreases as the width dimension approaches the outflow port 33b.
  • the flow passage area of the passage flow passage 31 is a cross-sectional area of the passage flow passage 31 in a direction perpendicular to the center line of the passage flow passage 31 or the direction in which the passage flow passage 31 extends.
  • the center line of the inflow passage 31 a extends in the depth direction Z, and the center line of the outflow passage 31 b is slightly inclined with respect to the depth direction Z.
  • the housing main body 24 has a passage throttling portion 47 for narrowing the width dimension of the outflow passage 31 b, and the throttling configuration of the passage 31 is realized by the passage throttling portion 47. ing. Further, the housing main body 24 has a constriction portion 48 in which the side surface and the downstream end surface are gradually narrowed toward the passage throttling portion 47. By providing the constricted portion 48, the inner wall surface of the passing throttle portion 47 and the inner wall surface of the introduction path 32b can be connected without any step. As a result, generation of separation flow at the connection between the outflow passage 31 b and the introduction passage 32 b can be suppressed, and measurement accuracy is improved.
  • the flow path boundary portion 34 which is the boundary between the passage flow path 31 and the measurement flow path 32 is the boundary between the outflow passage 31 b and the measurement flow path 32.
  • the flow path boundary portion 34 includes a measurement inlet which is an upstream end portion of the measurement flow path 32.
  • the length dimension of the flow path boundary portion 34 is the same as the length dimension of the outflow passage 31 b. In this case, the flow path boundary portion 34 is not exposed from the inflow port 33 a in the depth direction Z because the flow path boundary portion 34 on the side of the inflow port 33 a is disposed on the housing distal end side.
  • the surface on the housing base end side is referred to as a ceiling surface
  • the surface on the tip side is referred to as a bottom surface.
  • the flow path boundary portion 34 is located at a position hidden behind the ceiling surface of the inflow passage 31a.
  • the measurement channel 32 has a folded shape that is folded back at an intermediate position.
  • the measurement flow path 32 has a detection path 32a provided with the flow rate detection unit 22, an introduction path 32b for introducing intake air into the detection path 32a, and a discharge path 32c for discharging intake air from the detection path 32a.
  • the introduction path 32b extends from the flow path boundary portion 34 toward the housing proximal side
  • the discharge path 32c extends from the measurement outlet 33c toward the housing proximal side.
  • the introduction path 32 b and the discharge path 32 c extend in parallel with each other in the height direction Y, and the flow passage area of each is uniform in the height direction Y.
  • both the width dimension in the width direction X and the depth dimension in the depth direction Z are uniform in the height direction.
  • the introduction passage 32b and the discharge passage 32c are not narrowed even when they approach the proximal end of the housing.
  • the flow passage area of the measurement flow passage 32 is a cross-sectional area of the measurement flow passage 32 in the direction orthogonal to the center line of the measurement flow passage 32.
  • the center lines of the introduction path 32b and the discharge path 32c extend in the height direction Y, and the center line of the detection path 32a extends in the depth direction Z.
  • the height direction Y in which the introduction path 32b and the discharge path 32c extend corresponds to the alignment direction of the detection path 32a and the housing opening 61, and the alignment direction of the measurement flow path 32 and the sensor SA50.
  • the detection path 32a is disposed closer to the housing proximal side than the introduction path 32b and the discharge path 32c, and the downstream end portion of the introduction path 32b and the discharge path are passed between the introduction path 32b and the discharge path 32c. It connects with the upstream end of 32c.
  • the introduction passage 32b is disposed downstream of the discharge passage 32c in the depth direction Z.
  • the intake air flows in the opposite direction to the intake passage 12 and the passage passage 31.
  • the measurement flow path 32 after the intake air flowing in from the passage flow path 31 once flows toward the housing proximal end side, it passes through the detection path 32a to make a U-turn and flow toward the housing distal end side.
  • the measurement outlet 33 c opens the discharge passage 32 c in the width direction X.
  • the total opening area of the two measurement outlets 33c is substantially the same as the flow passage area of the discharge passage 32c.
  • the total opening area of the two measurement outlets 33c is larger than the flow passage area of the discharge passage 32c.
  • the total opening area is smaller than the flow path area, the intake air flowing through the measurement flow path 32 is less likely to flow out from the measurement outlet 33c, and the flow rate of the intake air passing through the flow rate detection unit 22 decreases to cause the flow rate detection unit There is a concern that the detection accuracy of 22 may be reduced.
  • the total opening area is substantially the same as the flow passage area, the entry of foreign matter from the measurement outlet 33 c and the reduction in the flow velocity in the measurement flow passage 32 are suppressed. Can.
  • the flow rate detection unit 22 includes a detection board 22a as a circuit board and a detection element 22b mounted on the detection board 22a.
  • the detection substrate 22a forms an outline of the flow rate detection unit 22, and the detection element 22b is disposed at the center of the substrate surface of the detection substrate 22a. In this case, the detection element 22 b is disposed at the center of the flow rate detection unit 22.
  • the detection board 22a is electrically connected to the connector terminal 28a (see FIG. 18).
  • the detection element 22b has a heat generating portion such as a heat generating resistor or the like and a temperature detection portion, and the flow rate detection portion 22 outputs a detection signal according to a change in temperature caused by the heat generation in the detection element 22b.
  • the flow rate detection unit 22 can also be referred to as a sensor chip.
  • the temperature change in the temperature detection unit accompanying the intake air flow rate in the detection element 22b needs to be large to some extent. It is preferable that the flow velocity of the fluid touching 22b be somewhat high. This is to eliminate the influence of the temperature change acting on the detection element 22b by natural convection with respect to the temperature change of the detection element 22b according to the flow velocity of the fluid. The temperature change due to natural convection changes according to the installation angle of the detection element 22b, and an error is given to the detection signal of the temperature change due to the fluid. By increasing the flow velocity of the fluid touching the detection element 22b, the influence of natural convection caused by the installation angle of the detection element 22b and the air flow meter 14 can be eliminated, and the detection of the fluid can be properly maintained.
  • the flow rate detection unit 22 corresponds to a physical quantity detection unit that detects the flow rate of intake air as a physical quantity. Further, the flow rate detection unit 22 is not limited to the thermal flow rate sensor, and may be an ultrasonic flow rate sensor, a Karman vortex flow rate sensor, or the like.
  • the air flow meter 14 has a sensor subassembly configured to include a tip type flow rate detection unit 22, and this sensor subassembly is referred to as a sensor SA50.
  • the sensor SA50 can be referred to as a sensor unit, and the air flow meter 14 can also be referred to as a tip type flow rate measuring device.
  • the sensor SA50 corresponds to a detection unit.
  • the sensor SA 50 has a circuit accommodating portion 51, a relay portion 52, a sensing portion 53 and a lead terminal 54, and has a plate shape extending in the depth direction Z and the height direction Y as a whole. ing.
  • the relay portion 52 is provided between the circuit housing portion 51 and the sensing portion 53, and the lead terminal 54 has conductivity, and the circuit housing is performed toward the opposite side to the sensing portion 53.
  • a plurality of parts extend from the part 51.
  • the relay portion 52 is thinner than the circuit accommodation portion 51 and the sensing portion 53 is thinner than the relay portion 52 in both the width direction X and the depth direction Z.
  • the relay portion 52 is smaller than the circuit accommodation portion 51 and the sensing portion 53 is smaller than the relay portion 52 in both the width dimension in the width direction X and the depth dimension in the depth direction Z.
  • a circuit step surface 55 is formed between the circuit accommodation portion 51 and the relay portion 52
  • a sensing step surface 56 is formed between the relay portion 52 and the sensing portion 53.
  • Each of the step surfaces 55, 56 extends annularly along the periphery of the relay portion 52 and faces the tip side of the sensor SA50.
  • the sensing unit 53 includes at least a part of the detection substrate 22a and the detection element 22b in the flow rate detection unit 22, and the sensing support unit 57 supporting the included portion is also included in the sensing unit 53. .
  • the sensing support portion 57 forms an outer shell of the sensing portion 53, and extends from the relay portion 52 toward the tip end of the flow rate detection portion 22.
  • the sensor SA 50 is disposed at a position where the sensing unit 53 enters the detection path 32 a.
  • the sensing unit 53 is disposed at an intermediate position of the detection path 32 a in the width direction X, and extends in the depth direction Z and the height direction Y.
  • the sensing unit 53 divides the middle region of the detection path 32a in the width direction X, and the flow passage area of the detection path 32a is provided at the position facing the flow rate detection unit 22 on the inner peripheral surface of the detection path 32a.
  • a detection throttling portion 59 is provided to squeeze the detection path 32 a by reducing The detection throttling portion 59 protrudes from the inner peripheral surface of the detection path 32 a toward the flow rate detecting portion 22, and the depth dimension D 1 of the detection throttling portion 59 in the depth direction Z is the depth of the flow rate detecting portion 22 in the depth direction Z It is larger than the depth dimension D2. Further, in the region where the flow rate detection unit 22 is present in the height direction Y, the depth dimension D3 of the sensing support unit 57 in the depth direction Z is larger than the depth dimension D1 of the detection diaphragm unit 59.
  • the detection diaphragm 59 has a tapered shape in the width direction X. Specifically, the base end of the detection throttling portion 59 projecting in the width direction X from the inner wall of the housing body 24 is the widest part, and the tip is the narrowest part. The width dimension of the base end of the detection diaphragm 59 is set to the depth dimension D1.
  • the detection throttling portion 59 has a curved surface that bulges toward the flow rate detection portion 22.
  • the detection throttling portion 59 may have a tapered shape that bulges toward the flow rate detecting portion 22.
  • the surface on the housing tip end side of the inner peripheral surface of the detection path 32a is referred to as a bottom surface, and the surface on the housing base end side is referred to as a ceiling surface.
  • the bottom surface of the detection path 32a is formed by the housing main body 24
  • the surface is formed by the sensing step surface 56 of the sensor SA50. That is, the detection path 32 a is partitioned by the sensing step surface 56.
  • the relay portion 52 is accommodated in the accommodation area PB1 as a part of the sensor SA50, and the boundary between the accommodation area PB1 and the measurement area PB2 coincides with the sensing step surface 56.
  • this gap may lead to the detection path 32a.
  • the detection diaphragm 59 extends from the bottom surface of the detection path 32 a toward the ceiling surface.
  • the outer peripheral surface of the detection diaphragm 59 extends straight in the height direction Y. In the height direction Y, the detection throttling portion 59 and the sensing step surface 56 of the sensor SA 50 are separated, and the space between the tip of the detection throttling portion 59 and the sensing step surface 56 is also included in the detection path 32a. It will be.
  • the separation distance between the sensing support portion 57 and the detection stop portion 59 gradually decreases as the flow rate detection portion 22 is approached in the depth direction Z.
  • the flow velocity of the intake air increases as it approaches the detection element 22b of the flow rate detection portion 22. Prone. In this case, since the intake air is applied to the detection element 22b at an appropriate flow rate, the detection accuracy of the flow rate detection unit 22 can be enhanced.
  • the housing main body 24 is formed in a tubular shape as a whole.
  • the housing body 24 has a housing opening 61 that opens the internal space 24 a, and the housing opening 61 is formed in one end face of the housing body 24.
  • the other end of the housing body 24 is closed, and when the closed portion is referred to as a housing bottom 62, the housing bottom 62 forms the bottom of the passage 31.
  • the housing body 24 has holes forming an inlet 33a and an outlet 33b, and the holes extend from the housing bottom 62 toward the proximal end of the housing.
  • the air flow meter 14 has a potting portion 65 as a closing portion for closing the housing opening 61.
  • the potting portion 65 seals the internal space 24 a by filling the internal space 24 a of the housing main body 24 with a molten resin material such as potting resin.
  • the potting portion 65 can also be referred to as a sealing portion or a sealing portion.
  • the potting portion 65 is not a portion integrally molded with the housing 21 in the air flow meter 14 but a portion formed independently of the housing 21.
  • the inner space 24 a includes a sealing area PA sealed by the potting portion 65 and an open area PB not sealed by the potting portion 65.
  • the sealing area PA extends from the housing opening 61 toward the housing front end, and the open area PB is disposed on the housing front end of the sealing area PA.
  • the open area PB extends from the sealing area PA toward the distal end of the housing, and the open area PB includes the measurement flow path 32.
  • the boundary between the sealing area PA and the open area PB extends in a direction perpendicular to the height direction Y.
  • the sealing area PA corresponds to a potting area.
  • the open area PB includes an accommodation area PB1 in which a part of the sensor SA50 is accommodated, and a measurement area PB2 in which the measurement flow path 32 is formed.
  • the housing area PB1 extends from the sealing area PA toward the front end of the housing, and the measurement area PB2 is provided on the housing front end of the housing area PB1.
  • the boundary between the accommodation area PB1 and the measurement area PB2 extends in a direction perpendicular to the height direction Y.
  • the accommodation area PB1 and the measurement area PB2 divide the open area PB into two in the height direction Y. .
  • An area step surface 66 is formed on the inner circumferential surface of the housing main body 24 between the inner circumferential surface of the sealing area PA and the inner circumferential surface of the open area PB.
  • the area step surface 66 extends annularly around the inner space 24 a and faces the proximal side of the housing.
  • the housing main body 24 is provided with a projecting portion 66 a that protrudes to the outer peripheral side in accordance with the area step surface 66.
  • the area step surface 66 and the projecting portion 66 a are disposed closer to the front end of the housing than the ring holding portion 25.
  • the area step surface 66 corresponds to the hooking portion.
  • a sealing step surface 67 provided closer to the housing base end than the region step surface 66 is provided on the inner peripheral surface of the sealing region PA.
  • the sealing step surface 67 like the region step surface 66, extends annularly so as to go around the periphery of the sealing region PA, and faces the housing proximal end side.
  • the sensor SA 50 is entirely housed in the internal space 24 a of the housing 21 in a state of straddling the sealing area PA and the open area PB in the height direction Y.
  • the circuit step surface 55 of the sensor SA 50 is in a state of being caught by the area step surface 66 of the housing 21, whereby the sensor SA 50 is further restricted from entering the internal space 24 a.
  • the circuit step surface 55 and the region step surface 66 are in contact with each other in close contact with each other, and when the potting portion 65 is formed, entry of molten resin into the open region PB is restricted by the contact portion. .
  • the boundary between the sealing area PA and the open area PB coincides with the boundary between the circuit accommodating portion 51 of the sensor SA 50 and the relay portion 52.
  • the depth dimension D5 of the sealing region PA in the region step surface 66 in the depth direction Z is larger than the depth dimension D6 of the open region PB.
  • the depth dimension D7 of the circuit housing portion 51 at the circuit step surface 55 in the sensor SA50 is smaller than the depth dimension D5 of the sealing area PA and larger than the depth dimension D6 of the open area PB.
  • the width dimension W1 of the sealing region PA in the region step surface 66 is larger than the width dimension W2 of the open region PB.
  • the width dimension W3 of the circuit accommodating portion 51 at the circuit step surface 55 in the sensor SA50 is smaller than the width dimension W1 of the sealing area PA and larger than the width dimension W2 of the open area PB.
  • the width direction X and the depth direction Z are perpendicular to the direction in which the circuit accommodating portion 51 and the flow rate detection portion 22 are aligned, and to the direction in which the sensing support portion 57 protrudes from the relay portion 52. become.
  • the lead terminal 54 also extends in a direction perpendicular to the direction in which the lead terminal 54 protrudes from the circuit housing 51.
  • the depth direction Z is the direction in which the intake air flows in the passage 31 and the detection passage 32 a.
  • the housing main body 24 has a horizontal partition wall 68 and a vertical partition wall 69, and these partition walls 68 and 69 are provided horizontally in the depth direction Z.
  • the lateral partition wall 68 defines the end portion of the open region PB on the housing distal end side by partitioning the internal space 24 a in a direction orthogonal to the height direction Y.
  • the lateral partition wall 68 extends from the upstream outer peripheral portion of the housing body 24 toward the downstream side, and divides the open area PB and the inflow passage 31 a into upper and lower portions.
  • the lateral partition wall 68 is disposed closer to the housing proximal end than the inflow port 33a, and forms a ceiling surface of the inflow passage 31a.
  • the vertical partition wall 69 extends from the horizontal partition wall 68 toward the proximal end of the housing, and separates the introduction passage 32b and the discharge passage 32c of the measurement flow passage 32, and forms a floor surface of the detection passage 32a.
  • the horizontal partition wall 68 can also be called a horizontal partition part
  • the vertical partition wall 69 can also be called a vertical partition part.
  • the horizontal partition wall 68 corresponds to a passage partition part
  • the vertical partition wall 69 corresponds to a measurement partition part.
  • the housing body 24 is configured so as not to constrict the internal space 24a even when approaching the housing opening 61 from the proximal end side of the housing than the inlet 33a and the outlet 33b. In this configuration, even if there is a step surface facing the proximal end of the housing like the area step surface 66 on the inner peripheral surface of the housing main body 24, there is no step surface facing the front end of the housing. Further, in the inner peripheral surface of the housing 21, the separation distance of the parts facing each other across the internal space 24a becomes smaller as the housing opening 61 becomes larger or unchanged in the height direction Y. There is nothing to do.
  • the vertical partition wall 69 is configured so as not to become thick even when approaching the housing opening 61 in the height direction Y.
  • the depth dimension of the vertical partition wall 69 in the depth direction Z does not increase or decrease although it may decrease or not as it approaches the housing opening 61 in the height direction Y.
  • the depth dimension D1 of the detection diaphragm 59 is equal to or smaller than the depth dimension D8 of the portion where the vertical partition wall 69 is narrow in the depth direction Z.
  • the internal space 24 a is narrowed as it approaches the housing opening 61 in the region on the housing distal end side with respect to the horizontal partition wall 68 in the height direction Y. It may be done. That is, the width dimension of the passage channel 31 in the width direction X may be gradually smaller as it approaches the housing opening 61 in the height direction Y. Further, on the inner peripheral surface of the passage flow path 31, a stepped surface facing the front end side of the housing may be formed.
  • the passage 31 is configured so as not to be narrowed even if it approaches the inlet 33 a in the depth direction Z.
  • the inner circumferential surface of the passage 31 may have a step surface facing the inflow port 33a, but there is no step surface facing the outflow port 33b.
  • the relay portion 52 of the sensor SA 50 is fitted to the inner peripheral surface of the housing body 24, whereby the circuit step surface 55 of the sensor SA 50 and the area step surface 66 of the housing body 24 are obtained. Is held in the position where it abuts.
  • the plate surface of the sensor SA50 the surface provided with the flow rate detection unit 22 is referred to as the front surface, and the surface opposite to the front surface is referred to as the back surface.
  • FIG. 8 and FIG. It has front SA protrusion 71a which protruded, and back SA protrusion 71b which protruded on the back side.
  • Each of the front SA protrusion 71 a and the rear SA protrusion 71 b is provided two each in the relay portion 52.
  • the housing body 24 has a width housing protrusion 72 a protruding in the width direction X from the inner peripheral surface thereof, and a depth housing protrusion 72 b protruding in the depth direction Z.
  • Each of the housing projections 72 a and 72 b protrudes from the inner peripheral surface of the housing main body 24 toward the inner peripheral side.
  • Two width housing projections 72a are provided at positions facing the surface of the sensor SA50.
  • One depth housing protrusion 72 b is provided at a position facing the side surface of the sensor SA 50 on the upstream outer peripheral portion of the housing main body 24, and is separated from the curved surface 45 of the housing main body 24 in the direction inclined with respect to the depth direction Z It extends in the direction
  • the housing protrusions 72a and 72b are disposed on the inner peripheral surface of the open area PB, and thus are provided closer to the front end of the housing than the ring holding portion 25.
  • the housing protrusions 72a and 72b are disposed at positions separated from the ring holding portion 25 toward the housing distal end side, the influence of resin distortion in the ring holding portion 25 causes the housing protrusions 72a, It is hard to be given to 72b. Therefore, the dimensions and positions of the housing protrusions 72a and 72b can be realized with high accuracy as designed.
  • the front SA protrusion 71 a and the width housing protrusion 72 a are in contact with each other at their front end surfaces, and the back SA protrusion 71 b is in contact with the flat portion of the inner peripheral surface of the housing main body 24.
  • the distal end surface of the depth housing projection 72b is in contact with the side end surface of the relay body 52 on the curved surface 45 side of the housing main body 24, and the side end surface of the relay portion 52 opposite to the curved surface 45 is the housing body 24. Is in contact with the flat portion of the inner circumferential surface of Thereby, relative movement of the sensor SA50 with respect to the housing main body 24 in the depth direction Z is restricted.
  • the sensor SA 50 is not wider than the center of the internal space 24 a in the width direction X due to the absence of a protrusion corresponding to the back SA protrusion 71 b on the inner peripheral surface of the housing main body 24. And is located at the opposite side. That is, the sensor SA50 is disposed at a position close to the back surface side of the sensor SA50.
  • the housing projections 72a and 72b before the sensor SA50 is fitted to the inner peripheral surface of the housing main body 24 at the time of manufacturing the air flow meter 14 will be described with reference to FIGS.
  • the projection dimensions of the housing protrusions 72a and 72b from the inner peripheral surface of the housing main body 24 are larger than those after the sensor SA50 is fitted.
  • the housing protrusions 72a and 72b before the sensor SA50 is fitted have a tapered shape in the protruding direction, and the tip is pointed.
  • the inner peripheral surface of the housing body 24 has a projection support surface 73 for supporting the housing projections 72a and 72b.
  • the projection covering surface 74 for covering the housing projections 72a and 72b from the housing front end side is the housing main body 24 in order to prevent the end surfaces of the housing projections 72a and 72b from being the step surface facing the housing front end. It is included in the inner surface.
  • the protrusion covering surface 74 is provided closer to the front end of the housing than the protrusion supporting surface 73, and is disposed on the inner peripheral side in the width direction X and the depth direction Z than the protrusion supporting surface 73.
  • a covering stepped surface 75 facing the proximal end of the housing is formed.
  • the SA protrusions 71a and 71b of the sensor SA50 have both shapes and dimensions before and after being fitted to the inner circumferential surface of the housing main body 24. There is no big change. This is due to the fact that the SA protrusions 71a and 71b are formed of a material having higher hardness and strength than the housing protrusions 72a and 72b.
  • the effective dimension W4 of the internal space 24a in the width direction X excluding the SA protrusions 71a and 71b is the sensor SA50 in the width direction X Smaller than the width dimension W5 of the thickest part of The width dimension W5 is a distance between the tips of the SA protrusions 71a and 71b.
  • the front end portion of the width housing protrusion 72a is scraped off by the front SA protrusion 71a, and the side end surface of the relay portion 52 The tip is scraped off.
  • the sensor SA50 is pressed toward the back surface of the inner peripheral surface of the housing main body 24 and the opposite side to the curved surface 45, so that the sensor SA50 in the internal space 24a in the width direction X Positioning is performed accurately.
  • the housing protrusions 72a and 72b are pressed by the front SA protrusion 71a and the relay portion 52 and deformed rather than the tip portions of the housing protrusions 72a and 72b are scraped off. Doing is more likely to occur.
  • the protrusion size of the housing protrusions 72a and 72b is reduced.
  • the width dimension W5 of the sensor SA50 is defined by the SA protrusions 71a and 71b
  • the width dimension W5 is smaller than the width dimension W5, for example, compared to the configuration defined by the front and back surfaces of the relay portion 52. Manufacturing variations are less likely to occur. For this reason, compared with the structure which sensor SA50 does not have SA protrusion 71a, 71b, the positioning accuracy of sensor SA50 with respect to the housing main body 24 can be further improved regarding the width direction X and the depth direction Z.
  • the SA protrusions 71a and 71b and the housing protrusions 72a and 72b are both elongated in the height direction Y.
  • the SA protrusions 71a and 71b extend from the circuit step surface 55 toward the front end of the housing to an intermediate position of the relay portion 52, and the housing protrusions 72a and 72b extend from the region step surface 66 toward the housing front end. Extends to an intermediate position of In the present embodiment, the housing protrusions 72a and 72b extend further to the housing tip than the SA protrusions 71a and 71b, and the tip of the width housing protrusion 72a is not scraped off at the housing tip than the front SA protrusion 71a.
  • the SA protrusions 71 a and 71 b may extend to the end of the relay portion 52 on the housing distal end side. Also, the housing protrusions 72a and 72b may extend to the end of the open area PB on the housing tip end side. In this case, since the end faces of the housing projections 72a and 72b do not face the proximal end of the housing in the open area PB, there is no need to provide the projection covering surface 74 and the covering step surface 75.
  • FIGS. 12 and 13 and FIGS. 14 and 15 are all diagrams related to the air flow meter 14 of FIG.
  • the SA protrusions 71a and 71b and the housing protrusions 72a and 72b are omitted, and in FIG. 14, the protrusion covering surface 74 and the covering step surface 75 are omitted.
  • the sensor SA 50 includes a circuit chip 81 that performs various processes, a lead frame 82 that supports the circuit chip 81, a relay substrate 83, and bonding wires. And 84.
  • the relay board 83 relays the signal from the flow rate detection unit 22 to the circuit chip 81.
  • a plurality of bonding wires 84 are provided so that the detection substrate 22 a and the lead terminals 54 are electrically connected.
  • the sensor SA50 has a mold portion 76 that forms an outer shell of the sensor SA50.
  • the mold portion 76 is formed of a resin material such as a mold resin, and fixed while protecting the flow rate detection portion 22, the lead terminal 54, the circuit chip 81, the lead frame 82, the relay substrate 83, the bonding wire 84 and the like. There is.
  • the bonding wire 84 passed between the relay substrate 83 and the detection substrate 22a is protected by a protection portion 77 formed of a resin material such as potting resin.
  • the detection substrate 22 a is provided with a dam material 78 extending along the peripheral edge of the protection part 77, and the dam material 78 plays a role in defining the shape of the molten resin when forming the protection part 77.
  • the mold portion 76 has a support surface 76 a for supporting the detection substrate 22 a.
  • the plate surface of the detection substrate 22a is bonded to the support surface 76a in a state of being overlapped, and the detection substrate 22a is supported in a state of being sandwiched by the support surface 76a and the protection portion 77.
  • the support surface 76a and the circuit chip 81 are disposed at positions separated as much as possible from the circuit step surface 55 which is a fixed part with the housing main body 24.
  • the support surface 76 a and the circuit chip 81 are not arranged at positions parallel to the circuit step surface 55 in the width direction X and the height direction Y. In this case, even if the sensor SA 50 is deformed by an external force applied to the circuit step surface 55, the flow rate detection unit 22 and the circuit chip 81 are not easily deformed, so the operating accuracy of 50 can be maintained properly.
  • the lead terminal 54 of the sensor SA 50 is electrically connected to the connector terminal 28 a of the connector portion 28 via the terminal unit 85 in the sealing area PA of the housing main body 24.
  • a plurality of lead terminals 54 and connector terminals 28 a are arranged at predetermined intervals in the depth direction Z, respectively.
  • the lead terminals 54 and the connector terminals 28 a corresponding to each other are disposed as a pair of terminals at positions opposed to each other in the width direction X, and the terminals 28 a and 54 are connected via a terminal unit 85.
  • the terminal unit 85 has a plurality of bridge terminals 86 and a terminal fixing portion 87 for fixing the bridge terminals 86.
  • the bridge terminal 86 is electrically conductive and is a U-shaped elongated member as a whole.
  • the bridge terminal 86 has a first connection portion 86a to which the connector terminal 28a is connected and a second connection portion 86b to which the lead terminal 54 is connected.
  • the connection portions 86a and 86b are portions where a part of the bridge terminal 86 curves and protrudes in the thickness direction, and the protruding portions are connected to the terminals 28a and 54 by welding or the like.
  • the plurality of bridge terminals 86 are arranged at predetermined intervals in the depth direction Z, and the terminal fixing portion 87 connects the middle portions of the bridge terminals 86 in a state of extending in the depth direction Z.
  • the terminal fixing portion 87 is formed of an electrically insulating resin material or the like.
  • the connector terminal 28a, the lead terminal 54, and the bridge terminal 86 all extend in the height direction Y at portions connected to one another. In this case, since it is not necessary to perform bending processing such as back bending according to the actual positional relationship when connecting the terminals 28a, 54, 86, the workload on manufacturing the air flow meter 14 is reduced. it can.
  • the terminals 28a, 54, 86 are connected by spot welding, the electrodes of the welding jig and the terminals 28a, 54, 86 can be stably brought into contact with each other, so that the welding strength can be easily enhanced.
  • welding for connecting the terminals 28a, 54, 86 laser welding or the like may be used in addition to spot welding. Further, the electrical connection of the terminals 28a, 54, 86 may be realized by wire bonding, soldering or the like.
  • the terminal unit 85 is fixed to the housing main body 24 by the terminal fixing portion 87 being hooked to the sealing step surface 67 or the like. In this case, in the height direction Y, positioning of the terminal unit 85 with respect to the housing main body 24 is performed by the sealing step surface 67.
  • the housing main body 24 is not shown, and the housing opening 61 and the potting portion 65 are shown by imaginary lines. Although the housing main body 24 is shown in FIG. 19, the potting portion 65 is not shown. Also, the bridge terminal 86 may have a fitting portion for fitting the connector terminal 28 a and the lead terminal 54. In this configuration, it is not necessary to perform spot welding on the terminals 28a, 54, 86.
  • a signal from the temperature sensing element 23a is output from the connector 28 in the following order: intake air temperature terminal 23c ⁇ bridge terminal 86 ⁇ lead terminal 54 ⁇ circuit chip 81 ⁇ lead terminal 54 ⁇ bridge terminal 86 ⁇ connector terminal 28a.
  • a flow rate signal corresponding to the flow rate of intake air flowing through the measurement flow path 32 is output from the flow rate detection unit 22 to the circuit chip 81, and the flow rate signal is processed by the circuit chip 81.
  • the flow rate of intake air in the intake passage 12 is calculated.
  • the flow rate calculated by the circuit chip 81 is transmitted to the ECU 20 by signal transmission through the lead terminal 54 and the connector terminal 28 a.
  • the air flow meter 14 detects the flow rate of the intake air flowing through the intake passage 12 by the flow rate detection unit 22.
  • the housing body 24 has a lip 89 extending along the periphery of the housing opening 61.
  • the lip 89 has an annular shape around the housing opening 61 and has a function of restricting the outflow of the molten resin from the housing opening 61 when the potting portion 65 is formed.
  • the flange portion 27 is present on the outer peripheral side of the lip 89.
  • the surface of the potting portion 65 is at a position spaced apart from the housing opening 61 in the height direction Y toward the front end of the housing. This surface does not extend straight in the width direction X and the depth direction Z, and is disposed closer to the housing opening 61 as the portion closer to the inner peripheral surface of the housing body 24 is. This is because when the potting portion 65 is formed, a phenomenon occurs in which the molten resin filled in the sealing area PA creeps up on the inner peripheral surface of the housing main body 24. The creeping up phenomenon of the molten resin is likely to occur particularly at the corner portion. On the other hand, in the present embodiment, as shown in FIG.
  • the epoxy resin can increase the positioning accuracy of the sensor SA50 due to its hardness compared to, for example, a urethane resin.
  • a thermosetting resin which can form the potting part 65 urethane resin, a silicone resin, etc. are mentioned other than an epoxy resin.
  • the mold apparatus 90 includes an inner peripheral mold portion 91 for molding the inner peripheral surface of the housing main body 24, outer peripheral mold portions 102 and 103 for molding the outer peripheral surface of the housing 21, and a passage flow path 31. It has a pass-through mold portion 104 for molding, and root mold portions 105 and 106 for molding the root portion 29a.
  • the inner peripheral mold portion 91 has a mold main body portion 92 and an insertion portion 93.
  • the die body 92 has a body recess 92 a for forming the outer peripheral surface of the flange portion 27 and the connector portion 28, and the ingress 93 is a body recess for forming the internal space 24 a of the housing body 24. It extends from the bottom of 92a.
  • the main body recess 92 a is recessed in the height direction Y, and the intruding portion 93 extends in the height direction Y.
  • the surface of the inner circumferential surface of the main body recess 92 a facing in the height direction Y is referred to as a bottom surface.
  • the intruding portion 93 has a sealing and molding portion 94 for forming the sealing area PA and an opening and molding portion 95 for forming the opening area PB.
  • the opening and molding portion 95 is a sealing and molding portion 94. Extends in the height direction Y from the The open molding section 95 has a housing molding section 96 for forming the housing area PB1, and a measurement molding section 97 for forming the measurement area PB2, and the measurement molding section 97 is higher than the housing molding section 96. It extends in the vertical direction Y.
  • the measurement and molding unit 97 includes a detection and molding unit 97a for forming the detection passage 32a, an introduction and molding unit 97b for forming the introduction passage 32b, and a discharge for forming the discharge passage 32c. And a molding portion 97c.
  • the introduction molding portion 97 b and the discharge molding portion 97 c extend from the detection molding portion 97 a in the height direction Y, and both are long pillars.
  • the introduction molding portion 97b and the discharge molding portion 97c are arranged side by side in the depth direction Z in a state of being separated from each other, and the detection molding portion 97a connects the introduction molding portion 97b and the discharge molding portion 97c.
  • the introduction molding portion 97 b corresponds to an introduction pillar portion
  • the discharge molding portion 97 c corresponds to a discharge pillar portion
  • the detection molding portion 97 a corresponds to a pillar connection portion.
  • the inner peripheral mold portion 91 is configured such that when the housing 21 is resin-molded, the entry portion 93 can be removed from the housing opening 61. Specifically, in the entry part 93, the sealing and forming part 94, the housing and forming part 96, the detection and molding part 97a, the introduction and molding part 97b, and the discharge and forming part 97c become thinner toward the tip of the entry part 93. Even though it does not change, it is not thick. In addition, even if a step surface facing the tip end side of the entering portion 93 is formed on the outer peripheral surface of the entering portion 93, a step surface facing the base end side of the entering portion 93 is not formed.
  • the width dimension in the width direction X and the depth dimension in the depth direction Z do not increase, although they may decrease or not as they approach the tip of the intruding portion 93.
  • the tip end portion of the inner peripheral mold portion 91 is a side which is not connected to the detection molding portion 97 a in the introduction molding portion 97 b and the discharge molding portion 97 c.
  • the separation distance L 1 thereof is small as it approaches or does not change as it approaches the tip end portion of the penetration portion 93. It has not been done.
  • the separation distance L2 between the outer side surfaces of the introduction molding portion 97b and the discharge molding portion 97c is not large although it may be smaller or unchanged as it approaches the leading end portion of the insertion portion 93.
  • the distance between the rightward facing right surface of the outer peripheral surface of the introduction molding portion 97b and the leftward facing left surface of the outer peripheral surface of the discharge molding portion 97c is As the tip end of the intruding portion 93 is approached, it does not become large. Similarly, the separation distance between the left surface of the introductory molding portion 97 b and the right surface of the discharge molding portion 97 c does not increase as it approaches the tip of the intruding portion 93.
  • the passage mold portion 104 when the housing 21 is resin-molded, the passage mold portion 104 can be removed from the inflow port 33a.
  • the pass-through portion 104 is an elongated pillar member extending in the depth direction Z.
  • the portion for forming the outlet 33b is referred to as a tip portion of the pass-through portion 104
  • the pass-through portion 104 is thickened even if it becomes thinner or unchanged as it approaches the tip. Absent.
  • a step surface facing the tip end side of the pass-through portion 104 is formed on the outer peripheral surface of the pass-through portion 104, a step surface facing the base end side of the pass-through portion 104 is not formed. Therefore, in the pass-through mold portion 104, the width dimension in the width direction X and the height dimension in the height direction Y decrease or do not change as they approach the tip end portion of the pass-through mold portion 104; is not.
  • the pair of outer peripheral mold portions 102 and 103 are arranged side by side in the width direction X.
  • the width direction X is a direction orthogonal to the depth direction Z, which is the alignment direction of the introduction molding portion 97 b and the discharge molding portion 97 c in the inner peripheral mold portion 91.
  • a housing recess 111 for molding the housing 21 and a mold recess 112 for accommodating the passage die 104 and the root die 105 and 106 are formed in the pair of outer peripheral dies 102 and 103.
  • portions different from each other are molded between the main body recessed portion 92a of the inner peripheral mold portion 91 and the housing recessed portion 111 of the outer peripheral mold portions 102 and 103.
  • the outer peripheral molds 102 and 103 have an outlet extension 113 for forming the measurement outlet 33 c, and the outlet extension 113 is from the bottom surface of the mold recess 112 for the housing 21. It extends in the width direction X.
  • first outer peripheral mold portion 102 is for forming a protective projection 29b and a mold portion (not shown) which enters into the main body recess 92a of the inner peripheral mold portion 91 to form the inner peripheral surface of the connector portion 28. And a recess.
  • the first outer peripheral mold portion 102 corresponds to a first mold portion
  • the second outer peripheral mold portion 103 corresponds to a second mold portion.
  • the width direction X in which the outlet extension portion 113 extends is also the alignment direction of the first outer peripheral mold portion 102 and the second outer peripheral mold portion 103.
  • the pair of root mold portions 105 and 106 are arranged in the depth direction Z between the first outer peripheral mold portion 102 and the second outer peripheral mold portion 103. Recesses for molding the root portion 29a are formed in the tip end surfaces of the root mold portions 105 and 106, respectively.
  • the concave portion of the first root mold portion 105 is shaped to match the upstream end surface of the root portion 29a, and the concave portion of the second root mold portion 106 is shaped to match the downstream end surface of the root portion 29a There is.
  • the method of manufacturing the air flow meter 14 corresponds to the method of manufacturing the physical quantity measuring device.
  • each of the mold parts 91 and 102 to 106 is prepared. Then, the mold portions 91 and 102 to 106 are assembled. For example, the first outer peripheral mold portion 102 and the second outer peripheral mold portion 103 are fixed to each other in a state in which the respective concave portions face each other, and the opening formed between the outer peripheral mold portions 102 and 103 is an inner peripheral mold. The insertion part 93 of the part 91, the passage mold part 104, and the root mold parts 105 and 106 are inserted.
  • This opening is formed by the mold recesses 112 of the outer peripheral molds 102 and 103, and the entry 93, the passage mold 104, the root mold 105, and the like of the inner peripheral mold 91 inserted from the opening. 106 will slide in the mold recess 112.
  • the first outer periphery mold 102 is placed on a work bench or the like, and the ingress part 93 of the inner periphery mold 91, the passage mold 104, and the root mold 105, 105 are placed in the recess.
  • the second outer periphery mold portion 103 may be placed on the first outer periphery mold portion 102. The point is that the mold apparatus 90 can be assembled.
  • the outlet extension 113 of the outer peripheral molds 102 and 103 is in contact with the discharge molding 97 c of the inner peripheral mold 91, whereby the measurement outlet 33 c is in the housing 21.
  • a configuration that penetrates the outer peripheral portion is realized.
  • the front end surface of the passage mold portion 104 is in contact with at least one of the inner peripheral surfaces of the housing recess 111 of the outer peripheral mold portions 102 and 103, whereby the outflow port 33 b is the outer peripheral portion of the housing 21.
  • a configuration that penetrates is realized.
  • a configuration in which the tip end portion of the pass-through mold portion 104 extends beyond the introduction molding portion 97 b and this tip end surface abuts on both of the outer peripheral mold portions 102 and 103 can be called inlay structure.
  • this spigot structure it is possible to exhibit the effect of suppressing burrs around the outlet 33b.
  • the intake air temperature terminal 23c and the connector terminal 28a are attached in advance to the inner peripheral mold portion 91 and the outer peripheral mold portions 102 and 103 in a state of being connected to each other at a stage before assembling the mold device 90. Thereby, even when the housing 21 is integrally molded, the configuration in which the terminals 23 c and 28 a are embedded in the housing 21 can be realized.
  • molten resin is injected into the mold assembly 90 from only one inlet formed in the mold assembly 90.
  • the injection port is formed, for example, in the first outer peripheral mold portion 102, and the molten resin for integrally molding the entire housing 21 is entirely filled in the mold device 90 by one injection.
  • the resin injection may be performed a plurality of times, all of the molten resin divided into the plurality of injections are used to integrally mold the housing 21.
  • the housing is integrated. It is considered impossible to say that it was molded.
  • the mold parts 91 and 102 to 106 are removed from the housing main body 24 by disassembling the mold apparatus 90.
  • the entry part 93 of the inner peripheral mold 91, the passage mold 104, and the root molds 105 and 106 are removed to separate the outer peripheral molds 102 and 103 from each other.
  • the housing 21 is removed from the outer peripheral molds 102 and 103.
  • the inner mold portion 91, the passage mold portion 104, and the root mold portions 105, 106 may be removed from the housing 21 after the outer mold portions 102, 103 are separated from each other. The point is that the mold device 90 can be disassembled and the housing 21 can be taken out.
  • the configuration capable of extracting the intruding portion 93 from the housing opening 61 is realized, thereby integrally molding the inner peripheral surface of the housing main body 24.
  • the measurement flow path 32 is integrally molded by detaching the measurement and molding portion 97 from the inner peripheral surface of the housing main body 24.
  • the pass-through portion 104 as described above, the configuration capable of extracting the pass-through portion 104 from the inflow port 33a is realized, and as shown in FIG. Can be integrally molded.
  • the introduction molding portion 97 b extends beyond the flow path boundary portion 34 and reaches the outflow passage 31 b.
  • the passage die portion 104 is caught by the vertical partition wall 69 and flows through the passage die portion 104. It can be avoided that it can not be removed from the inlet 33a.
  • the outer peripheral surface of the housing 21 is formed by using at least two mold portions of the first outer peripheral mold portion 102 and the second outer peripheral mold portion 103, the degree of freedom regarding the outer peripheral shape of the housing 21 can be obtained. It can be enhanced. Further, in the mold apparatus 90, since the width direction X in which the outer peripheral mold portions 102 and 103 are aligned is orthogonal to the depth direction Z in which the introduction path 32b and the discharge path 32c are arranged, for example, the outer peripheral mold portions 102 and 103 in the depth direction Z The depth dimension of the housing recess 111 is smaller than that in the side-by-side configuration. In this case, since the molten resin easily spreads over the entire housing recess 111, it is possible to suppress the occurrence of a product failure in which a part of the resin-molded housing 21 is missing.
  • the outlet extension 113 of the first outer peripheral mold 102 is in contact with the inner peripheral mold 91 in the mold device 90, the measurement outlet 33c penetrating the outer peripheral portion of the housing 21 is molded It can be molded by the apparatus 90. For this reason, for example, the working load for forming the measurement outlet 33c can be reduced as compared with the method of forming the measurement outlet 33c by forming a hole in the outer peripheral portion of the housing 21 after molding the housing 21.
  • the outlet extension portion 113 may be extended from the first outer peripheral mold portion 102 in the width direction X.
  • the manufacturing cost of the mold apparatus 90 can be reduced by the amount of non-use of the dedicated mold part, and furthermore, the work load in assembling the mold apparatus 90 can be reduced by not using the dedicated mold part.
  • the open configuration can be realized by resin molding.
  • the housing 21 from the first outer peripheral mold portion It becomes difficult to remove 102 in the width direction X.
  • the flange portion 27 and the connector portion extended in the width direction X and the depth direction Z from the housing body 24 by combining the mold main body 92 of the inner peripheral mold 91 and the outer peripheral molds 102 and 103. 28 are molded.
  • the mold body portion 92 and the outer peripheral mold portions 102 and 103 are combined in the height direction Y, whereby the flange portion 27 to the mold body portion 92 and the outer peripheral mold The parts 102 and 103 can be easily removed.
  • the ingression portion 93 of the inner peripheral mold portion 91 is in a state of being inserted into the respective housing concave portions 111 of the outer peripheral mold portions 102 and 103.
  • the operator can remove the inner peripheral mold portion 91 from the housing 21 by pulling out the insertion portion 93 from the housing opening 61 while gripping the mold main body portion 92. .
  • the mold apparatus 90 which realizes the integral molding of the housing 21 and to easily remove the mold apparatus 90 from the housing 21.
  • the internal space 24 a is not narrowed. For this reason, when the housing 21 is resin-molded using the mold device 90, it is possible to withdraw the entry portion 93 of the inner peripheral mold portion 91 from the housing opening 61. Therefore, it is not necessary to divide the part which forms interior space 24a in housing 21 into a plurality of members.
  • the entering portion 93 is caught in the inner peripheral surface of the narrowed portion and enters from the housing opening 61 It becomes difficult to remove the part 93.
  • the portion forming the internal space 24a is divided into a plurality of members, and the internal space 24a is manufactured by assembling these members. As a result, the above-described manufacturing variation is likely to occur. I will.
  • the fact that the internal space 24a is not narrowed toward the proximal end of the housing means that the internal space 24a is narrowed toward the distal end of the housing.
  • the housing 21 can be miniaturized. Further, when the miniaturization of the housing 21 is realized, the resin material used for manufacturing the housing 21 is reduced, so that the material cost required for manufacturing the housing 21 can be reduced. That is, the manufacturing cost of the air flow meter 14 can be reduced.
  • the area step surface 66 where the sensor SA 50 is hooked faces the housing opening 61 side. Therefore, positioning of the sensor SA 50 in the height direction Y can be performed by the area step surface 66 while realizing a configuration in which the inner space 24 a is not narrowed toward the housing opening 61 by the area step surface 66. Therefore, when manufacturing the air flow meter 14, the operator can perform accurate positioning of the sensor SA50 by performing an easy operation of inserting the sensor SA50 into the housing opening 61 to a position where the sensor SA50 is hooked on the area step surface 66. it can.
  • the sealing region PA and the open region PB can be divided.
  • the molten resin filled in the sealing area PA is restricted from flowing into the open area PB when the potting portion 65 is manufactured, the size and the shape of the open area PB and the measurement flow path 32 are intended by the molten resin It is possible to avoid changing without changing it.
  • the vertical partition wall 69 that divides the introduction passage 32 b and the discharge passage 32 c in the open area PB is not thickened even if it approaches the housing opening 61 in the height direction Y. For this reason, in the entry portion 93 of the inner peripheral mold portion 91, the introduction molding portion 97b and the discharge molding portion 97c can be removed from the introduction path 32b and the discharge path 32c. Therefore, it is possible to realize a configuration capable of extracting the intruding portion 93 of the inner peripheral mold portion 91 from the housing opening 61.
  • the detection throttle portion 59 is provided in the detection path 32a of the measurement flow path 32, so that the flow rate of the intake air passing through the flow rate detection portion 22 tends to be large. Detection accuracy can be enhanced. Further, the detection throttling portion 59 does not become thick even when approaching the housing opening 61 in the height direction Y, and further extends from the vertical partition wall 69 toward the housing opening 61 and from the vertical partition wall 69 Not too thick. For this reason, at the time of resin molding of the housing 21, it is possible to remove the entry portion 93 of the inner peripheral mold portion 91 from the vertical partition wall 69 and the detection throttle portion 59.
  • the passage flow passage 31 is provided on the housing distal end side than the measurement region PB2
  • the measurement flow passage 32 is molded by the entry portion 93 of the inner peripheral mold portion 91
  • the passage flow passage 31 is The configuration of molding by the passage mold portion 104 can be realized.
  • the depth direction Z in which the passage mold portion 104 is extracted from the passage flow path 31 must be orthogonal to the height direction Y in which the entry portion 93 is extracted from the housing opening 61.
  • the horizontal partition wall 68 that divides the detection path 32 a and the passage flow path 31 extends in the depth direction Z, the horizontal partition wall 68 can be divided by the passage mold portion 104 and the intruding portion 93 of the inner circumferential mold portion 91. It can be molded. Therefore, even if the horizontal partition wall 68 extending in the depth direction Z is included in the housing 21, it is possible to integrally mold the housing 21.
  • a physical quantity measuring device in which a measurement flow path is formed by a combination of a plurality of members.
  • the physical quantity measuring device has a pair of covers facing each other, and a main body provided between the covers.
  • a sub passage is formed between the cover and the main body portion or between the pair of covers, and a flow rate detecting portion for detecting the flow rate of intake air is provided in the sub passage.
  • the pair of covers and the main body portion are formed independently of each other by a resin molding process of injecting a thermoplastic resin into a mold, and by being assembled to each other, a sub passage is formed.
  • the subpassage is formed by a plurality of members such as a pair of covers and a main body
  • shape, size, etc. of the subpassage will vary from product to product due to positional deviation of these members.
  • the attachment position of the pair of covers with respect to the main body portion is shifted in the thickness direction of the housing, the flow passage area of the sub-passage will vary from product to product.
  • the upstream end of the outer peripheral surface of the housing 21 is referred to as an outer peripheral upstream end 132a, and the downstream end is referred to as an outer peripheral downstream end 132b.
  • the curved surface 45 is formed by the housing 21 gradually decreasing in thickness in the width direction X from the flat surface 44 toward the outer peripheral upstream end 132 a in the depth direction Z.
  • the width dimension in the width direction X gradually decreases toward the outer peripheral upstream end 132a.
  • the outer peripheral surface of the housing 21 has boundaries 131 a and 131 b between the flat surface 44 and the curved surface 45.
  • the vertical boundary 131a extends in the height direction Y
  • the horizontal boundary 131b extends in the depth direction Z.
  • the surface on the connector portion 28 side of the outer peripheral surface of the housing 21 is referred to as the front surface
  • the surface opposite to the front surface is referred to as the back surface.
  • These front and back surfaces are aligned in the width direction X. It is a pair of side surface contained in an outer peripheral surface.
  • the outer peripheral upstream end 132 a is a boundary between the curved surface 45 on the front side and the curved surface 45 on the back side, and extends in the height direction Y.
  • the outer peripheral downstream end 132 b is a flat surface extending in the width direction X and the height direction Y.
  • the outflow port 33b is provided in the outer peripheral downstream end 132b.
  • the flat surface 44, the curved surface 45, and the measurement outlet 33c are all vertically elongated in the height direction Y.
  • the measurement outlet 33 c has a flat shape extending along the vertical boundary 131 a in the state of straddling the vertical boundary 131 a in the depth direction Z.
  • the vertical dimension in the height direction Y is larger than the horizontal dimension in the depth direction Z.
  • the open area of the measurement outlet 33c is smaller than the open area of the inlet 33a.
  • the height dimension H11 of the flat surface 44 is larger than any of the height dimension H12 of the curved surface 45 and the height dimension H13 of the measurement outlet 33c, and the height dimension H12 of the curved surface 45 is measured It is larger than the height dimension H13 of the outlet 33c.
  • the curved surface 45 and the measurement outlet 33 c are disposed at an intermediate position of the flat surface 44, and the measurement outlet 33 c is disposed at an intermediate position of the flat surface 44. In this case, both the end on the housing distal end side and the end on the housing proximal end of the curved surface 45 are included in the lateral boundary portion 131 b.
  • the vertical boundary 131a between the outer peripheral upstream end 132a and the outer peripheral downstream end 132b, and the vertical boundary 131a is located near the outer peripheral upstream end 132a.
  • the length dimension L11 of the flat surface 44 is larger than the length dimension L12 of the curved surface 45.
  • the length dimension L13 of the measurement outlet 33c is smaller than any of the length dimension L11 of the flat surface 44 and the length dimension L12 of the curved surface 45.
  • the depth direction Z is the alignment direction of the outer peripheral upstream end 132a and the outer peripheral downstream end 132b, and the flat surface 44 extends in the alignment direction.
  • the height direction Y corresponds to the direction orthogonal to the alignment direction.
  • the measurement outlet 33 c is disposed at a position near the outer peripheral upstream end 132 a in the depth direction Z.
  • the separation distance L14 between the measurement outlet 33c and the outer peripheral upstream end 132a is smaller than the separation distance L15 between the measurement outlet 33c and the outer peripheral downstream end 132b.
  • the upstream end is referred to as an outlet upstream end 134a
  • the downstream end is referred to as an outlet downstream end 134b.
  • the longitudinal boundary 131a is a position closer to the outlet upstream end 134a in the depth direction Z It is in.
  • the separation distance L16 between the outlet upstream end 134a and the longitudinal boundary 131a is smaller than the separation distance L17 between the outlet downstream end 134b and the longitudinal boundary 131a.
  • the inner circumferential surface of the measurement flow channel 32 has formation surfaces 135a to 135c forming the measurement outlet 33c.
  • the outer peripheral portion of the housing 21 is provided with a through hole for forming the measurement outlet 33c, and the forming surfaces 135a to 135c are included in the inner peripheral surface of the through hole.
  • the upstream formation surface 135a forms an outlet upstream end 134a of the measurement outlet 33c, and is orthogonal to the flat surface 44 by facing the downstream side in a state orthogonal to the depth direction Z.
  • the downstream forming surface 135b forms an outlet downstream end 134b, and is inclined with respect to the flat surface 44 by being inclined to the outer peripheral side and facing the upstream side.
  • connection forming surface 135c connects the upstream forming surface 135a and the downstream forming surface 135b, and is provided in a pair with the forming surfaces 135a and 135b interposed therebetween.
  • Each connection formation surface 135c is orthogonal to the height direction Y, respectively.
  • the downstream forming surface 135b is an inclined surface that extends straight from the outlet downstream end 134b toward the inner circumferential side of the housing 21 and is not orthogonal to the downstream flat portion 137a.
  • the downstream forming surface 135b provided on each of the front and back sides of the housing 21 is a tapered surface in which the housing 21 is thinned toward the outlet upstream end 134a of the measurement outlet 33c.
  • the inclination angle ⁇ 1 of the downstream forming surface 135b with respect to the flat surface 44 such as the downstream flat portion 137a is, for example, 30 degrees.
  • the inclination angle ⁇ 1 may be larger or smaller than 30 degrees, but is preferably 30 degrees or less.
  • the flat surface 44 has a downstream flat portion 137a, a distal flat portion 137b, and a proximal flat portion 137c.
  • the downstream flat portion 137a extends in the depth direction Z from the measurement outlet 33c toward the outer peripheral downstream end 132b.
  • the distal flat portion 137b extends from the downstream flat portion 137a toward the housing distal end, and the proximal flat portion 137c extends from the downstream flat portion 137a toward the housing proximal end.
  • the downstream flat portion 137a is disposed between the distal flat portion 137b and the proximal flat portion 137c.
  • the distal flat portion 137b also includes a portion of the measurement outlet 33c and the curved surface 45 that wraps around the housing distal end, and this portion extends from the measurement outlet 33c and the curved surface 45 toward the housing distal end.
  • the proximal flat portion 137c also includes a portion of the measurement outlet 33c and the curved surface 45 that wraps around the housing proximal side, and this portion is directed from the measurement outlet 33c and the curved surface 45 toward the housing proximal side. It extends.
  • the curved surface 45 does not necessarily have a uniform degree of bending, and in the curved surface 45, the portion with the largest degree of bending is disposed at a position near the outer peripheral upstream end 132a in the depth direction Z. For this reason, the measurement outlet 33c is disposed at a position straddling the vertical boundary portion 131a, so that the measurement outlet 33c is disposed at the downstream end portion of the curved surface 45 with the smallest degree of bending. When viewed from the upstream side, it looks like an elongated shape extending in the depth direction Z.
  • the measurement outlet 33c is wider in the width direction X than the configuration in which the measurement outlet 33c is disposed at a position separated from the downstream end of the curved surface 45 toward the outer peripheral upstream end 132a.
  • the width dimension W11 is smaller.
  • the curved surface 45 includes an upstream curved portion 138a, a distal curved portion 138b, and a proximal curved portion 138c.
  • the upstream curved portion 138a extends from the measurement outlet 33c toward the outer peripheral upstream end 132a in the depth direction Z.
  • the distal curved portion 138b extends from the upstream curved portion 138a toward the housing distal end, and the proximal curved portion 138c extends from the upstream curved portion 138a toward the housing proximal end.
  • the upstream curved portion 138a is disposed between the distal curved portion 138b and the proximal curved portion 138c.
  • the distal end side curved portion 138b has a portion which goes around the housing distal end side of the measurement outlet 33c, and this portion enters between the measurement outlet 33c and the distal end side flat portion 137b, and the housing from the measurement outlet 33c It extends to the tip side.
  • the proximal end curved portion 138c has a portion which is wound around the housing proximal end side of the measurement outlet 33c, and this portion enters between the measurement outlet 33c and the proximal flat portion 137c, and the measurement outlet It extends from 33c towards the proximal end of the housing.
  • the flat surface 44 corresponds to the outer peripheral flat surface
  • the curved surface 45 corresponds to the outer peripheral inclined surface inclined with respect to the outer peripheral flat surface.
  • the distal flat portion 137b and the proximal flat portion 137c correspond to an extending flat portion
  • the upstream curved portion 138a corresponds to an upstream inclined portion
  • the distal curved portion 138b corresponds to the extension slope
  • the vertical boundary portion 131a corresponds to the outer peripheral boundary portion.
  • the width direction X is referred to as a first direction
  • the respective surfaces located on both sides of the housing 21 in the first direction are referred to as a first surface and a second surface, respectively.
  • a flat surface 44 and a curved surface 45 are included.
  • the outer peripheral upstream end 132a is referred to as the third surface
  • the outer peripheral downstream end 132b is referred to as the fourth surface
  • the third and fourth surfaces are both sides of the housing 21 in the second direction. It is located in
  • the measurement outlet 33 c is provided on each of the first surface and the second surface, and is opened toward the outside of the housing 21 so as not to face the fourth surface side in the second direction.
  • the air AF1 that has reached the outer peripheral upstream end 132a of the housing 21 among the intake air that flows forward through the intake passage 12 travels along the upstream curved portion 138a of the curved surface 45 and reaches the measurement outlet 33c while changing the flow direction Do.
  • the flow direction of the air AF1 is already close to the alignment direction of the outlet upstream end 134a and the outlet downstream end 134b, and the air AF1 does not easily flow into the measurement outlet 33c. ing. Therefore, it is difficult for the backflow that the air AF1 flows into the measurement outlet 33c to occur, and in the forward flow, the measurement outlet 33c is less likely to receive the dynamic pressure from the air AF1.
  • the air AF2 flowing along the downstream flat portion 137a of the flat surface 44 peels from the outer peripheral surface of the housing 21 by advancing in the depth direction Z even after passing through the downstream end of the downstream flat portion 137a.
  • turbulence of the air flow such as a vortex flow easily occurs around the outer peripheral downstream end 132b and the like downstream of the downstream flat portion 137a.
  • Due to the disturbance of the air flow air AF3 that flows backward toward the outer peripheral downstream end 132b may be generated around the outer peripheral downstream end 132b.
  • the backflow of only a part of the air is referred to as a part of the backflow.
  • the measurement outlet is provided at the outer peripheral downstream end 132b or the like downstream of the downstream flat portion 137a
  • the backflow that the air AF3 flows into the measurement outlet tends to occur.
  • the measurement outlet 33c of this embodiment is not disposed downstream of the downstream flat portion 137a, the air AF3 does not flow into the measurement outlet 33c.
  • the outer peripheral downstream end 132b receives dynamic pressure from the air AF4.
  • the measurement outlet receives dynamic pressure from the air AF4.
  • the measurement outlet 33c of this embodiment is not provided at the outer peripheral downstream end 132b and is not a configuration opened toward the downstream side, it does not receive dynamic pressure from the air AF4. Further, there is no backflow that the air AF4 flows into the measurement outlet 33c into which the air AF4 flows.
  • the air AF5 flowing out from the measurement outlet 33c through the measurement channel 32 flows along the downstream forming surface 135b, and after flowing out from the measurement outlet 33c, easily flows along the downstream flat portion 137a. It has become. In this case, it is difficult for the air AF5 to separate from the downstream flat portion 137a after flowing out from the measurement outlet 33c, and the air flow such as a vortex around the measurement outlet 33c along with the separation of the air AF5 from the downstream flat portion 137a. Disturbance is less likely to occur.
  • the air AF6 flowing out from the measurement outlet 33c is orthogonal to the flat surface 44. I will go in the direction. In this case, the turbulence of the air flow such as the vortex flow around the measurement outlet 33 c due to a large difference between the traveling direction of the air AF 6 and the traveling direction of the air forwardly flowing in the depth direction Z on the outer peripheral side of the housing 21. It is thought that it is easy to occur. Further, in this case, the air AF 6 is separated from the downstream flat portion 137 a by flowing out from the measurement outlet 33 c, and the air flow tends to be disturbed around the measurement outlet 33 c due to the separation. I can think of it.
  • the measurement outlet 33 c is not open toward the outer peripheral downstream end 132 b. Therefore, even if partial backflow of air AF3 or the like or total backflow of air AF4 or the like occurs in the intake passage 12, it is difficult for the intake air to flow into the measurement outlet 33c along with the backflow. In this case, since the flow of the intake air in the measurement flow path 32 is less likely to be disturbed by the backflow or the total backflow, it is possible to suppress the decrease in the accuracy of the flow detection by the flow detection unit 22.
  • the measurement outlet 33 c is less likely to receive the dynamic pressure due to the total backflow, so that the flow of intake air in the measurement flow path 32 is less likely to be disturbed by the total backflow. Also from this point, it is possible to suppress the decrease in the accuracy of flow rate detection by the flow rate detection unit 22. Therefore, the measurement accuracy of the intake air amount by the air flow meter 14 can be improved.
  • the downstream flat portion 137a extends from the measurement outlet 33c toward the downstream side, so that the configuration in which the measurement outlet 33c is not opened toward the downstream side can be realized.
  • the measurement outlet 33c and the outer peripheral downstream end 132b are separated in the depth direction Z by the downstream flat portion 137a. For this reason, even if air turbulence due to partial or total reverse flow occurs in the intake passage 12 around the outer peripheral downstream end 132b, the downstream flat portion 137a can suppress the disturbance from reaching the measurement outlet 33c.
  • the distal end side flat portion 137b and the proximal end flat portion 137c are also disposed between the measurement outlet 33c and the outer peripheral downstream end 132b on the outer peripheral surface of the housing 21. ing. For this reason, even if the turbulence of the air flow occurs at the positions on the housing distal end side and the housing proximal end side of the measurement outlet 33c among the positions around the outer peripheral downstream end 132b, the turbulence reaches the measurement outlet 33c. This can be suppressed by the flat portions 137b and 137c.
  • the upstream curved portion 138a extends from the measurement outlet 33c toward the upstream side. Therefore, the downstream air such as the air AF1 that has reached the outer peripheral upstream end 132a of the housing 21 easily flows along the measurement outlet 33c by flowing along the upstream curved portion 138a, and is difficult to flow into the measurement outlet 33c. ing. In this case, since the dynamic pressure due to the forward air is hard to be applied to the measurement outlet 33c, it is possible to suppress that the air flow in the measurement flow path 32 is disturbed by the dynamic pressure and the detection accuracy of the flow rate detection unit 22 decreases.
  • the measurement outlet 33 c is disposed at the downstream end of the curved surface 45 in the curved surface 45 in which the portion with the largest degree of bending in the depth direction Z is disposed closer to the outer peripheral upstream end 132 a.
  • the measurement outlet 33c is hardly opened toward the upstream side, the probability that the air flowing straight in the depth direction Z in the forward flow air directly reaches the measurement outlet 33c is low. . For this reason, it is difficult for the downstream air to flow into the measurement outlet 33c and the downstream air to apply dynamic pressure to the measurement outlet 33c.
  • the air flowing obliquely along the depth direction Z among the downstream air flowing along the curved surface 45 also has a width such that it is difficult to flow into the measurement outlet 33c by flowing along the curved portions 138b and 138c.
  • the traveling direction of the direction X is to be changed. In this case, the dynamic pressure due to the downstream air can be made more difficult to be applied to the measurement outlet 33c.
  • the downstream formation surface 135b forming the outlet downstream end 134b of the measurement outlet 33c is not orthogonal to the depth direction Z but inclined toward the outer peripheral side of the housing 21. .
  • the traveling direction of the air tends to approach the traveling direction of the downstream air flowing through the intake passage 12.
  • the air AF 5 is less likely to be peeled off from the downstream flat portion 137 a, the disturbance of the air flow due to the peeling is less likely to occur around the measurement outlet 33 c. Therefore, it can suppress that the detection precision of the flow volume detection part 22 falls because the air which flows through the measurement flow path 32 becomes difficult to flow out out of the measurement exit 33c.
  • the measurement outlet 33 c is disposed at a position near the outer peripheral upstream end 132 a in the depth direction Z.
  • the separation distance between the outer peripheral downstream end 132b and the measurement outlet 33c in the housing 21 is as large as possible, even if the air flow is disturbed due to the backflow around the outer peripheral downstream end 132b, the disturbance is measured outlet 33c. Can be more reliably suppressed.
  • the open area of the measurement outlet 33c is smaller than the open area of the inflow port 33a, forward flow air such as the air AF1 is more likely to flow into the measurement outlet 33c than the inflow port 33a. ing. Therefore, it is possible to suppress the flow of the forward air into the measurement outlet 33c.
  • the measurement outlet 33 c has a flat shape extending in the height direction Y. For this reason, even if the insertion depth of the air flow meter 14 into the air flow insertion hole 12b varies somewhat for each vehicle by setting an arrangement area where the measurement outlet 33c is necessarily arranged in the intake passage 12, the measurement outlet 33c Can be placed reliably in the placement area. Further, in this case, unlike in the present embodiment, for example, the separation distance between the measurement outlet 33c and the outer peripheral downstream end 132b in the depth direction Z is smaller than in the configuration in which the measurement outlet 33c has a flat shape extending in the depth direction Z. growing. Therefore, even if turbulence of the air flow occurs around the outer peripheral downstream end 132b, the turbulence can be suppressed from reaching the measurement outlet 33c.
  • the region step surface 66 is disposed closer to the housing distal end than the ring holding portion 25.
  • the housing main body 24 has a housing wall 121 forming the housing area PB1 and a sealing wall 122 forming the sealing area PA, and these walls 121 and 122 are both in the height direction Y. It is an extended tubular part.
  • the sealing wall portion 122 is provided closer to the housing base end than the housing wall portion 121, and the sealing wall portion 122 and the housing wall portion 121 are connected by the projecting portion 66a.
  • the overhanging portion 66a is also included in the housing main body 24, and the overhanging portion 66a corresponds to the housing connection portion.
  • the housing wall 121 corresponds to the housing wall.
  • the inner circumferential surface is disposed on the outer circumferential side than the inner circumferential surface of the housing wall portion 121, and the outer circumferential surface is disposed on the outer circumferential side of the outer circumferential surface of the housing wall portion 121.
  • an intermediate portion between the housing wall portion 121 and the sealing wall portion 122 bulges to the outer peripheral side.
  • the projecting portion 66a has a laterally extending portion 66b extending outward from the accommodation wall portion 121 and a longitudinally extending portion 66c extending from the sealing wall portion 122 toward the front end of the housing,
  • the connecting portions of the extension portions 66b and 66c are chamfered by a curved surface.
  • the laterally extending portion 66 b corresponds to an orthogonal extending portion extending in a direction orthogonal to the height direction Y.
  • a housing attachment portion attached to the intake pipe 12 a is configured by the ring holding portion 25, the flange portion 27 and the sealing wall portion 122.
  • the ring holding portion 25, the flange portion 27 and the sealing wall portion 122 have a shape in which the housing attachment portion extends in the width direction X and the depth direction Z along the peripheral portion of the housing 21 as a whole.
  • the height direction Y is orthogonal to the direction in which the housing attachment portion extends.
  • the ring holding portion 25 is fixed to the intake pipe 12a via an O-ring 26, and the flange portion 27 is fixed to the intake pipe 12a via a boss 12d.
  • a load for fixing the air flow meter 14 to the intake pipe 12 a is applied to the sealing wall portion 122 via the ring holding portion 25 and the flange portion 27. Then, the strength of the sealing wall portion 122 is enhanced by the sealing wall portion 122 being formed thick as a whole.
  • the outer peripheral end of the cross section is circular as a whole, while the inner peripheral end is rectangular as a whole.
  • the sealing wall portion 122 is in a state of entering into the airflow insertion hole 12b of the intake pipe 12a, and the outer peripheral surface of the sealing wall portion 122 such as the ring holding portion 25 is the inner peripheral surface of the airflow insertion hole 12b or the pipe flange 12c.
  • the airflow insertion hole 12b is formed in a circular shape
  • the outer peripheral end of the sealing wall portion 122 is formed in a circular shape in accordance with the shape of the airflow insertion hole 12b.
  • the O-ring 26 is used for the airtightness between the outer peripheral surface and the inner peripheral surface. It is easy to secure.
  • the sensor SA50 is inserted into the inner space 24a formed by the inner peripheral surface of the housing main body 24, and the inner peripheral surface of the sealing wall 122 faces the outer peripheral surface of the sensor SA50.
  • the cross section of the sensor SA50 is flat due to the plate shape as a whole, and the inner peripheral end of the sealing wall 122 is flat according to the cross sectional shape of the sensor SA50. It is formed in the shape of a circle.
  • the cross section of the sealing wall part 122 is a cross section extended in the direction orthogonal to the height direction Y.
  • the internal space 24 a corresponds to a housing space in which the sensor SA 50 is housed.
  • the thickness dimension D21 of the sealing wall portion 122 in the circumferential direction is attributable to the fact that the inner periphery is flat.
  • a pair of SA plate surfaces 125 which are a pair of plate surfaces are included in the outer peripheral surface of the sensor SA 50 which is plate-shaped as a whole, and a pair of SA side surfaces 126 which are a pair of side surfaces.
  • the SA plate surface 125 extends in the depth direction Z as a whole, and the SA side surface 126 extends in the width direction X as a whole.
  • the portion facing the SA plate surface 125 of the sensor SA 50 is thicker as a whole than the portion facing the SA side surface 126.
  • the portion where the thickness dimension D21 is the largest is included in the portion facing the SA plate surface 125.
  • the SA plate surface 125 is also a plate surface extending in the height direction Y in the sensor SA50.
  • the ring holding portion 25 is formed by a holding groove 25 a provided in the sealing wall portion 122.
  • the holding groove 25 a is formed by a pair of groove forming portions, the tip surfaces of these groove forming portions are included in the outer peripheral surface of the sealing wall portion 122. Therefore, the thickness dimension D21 of the sealing wall 122 is the distance between the inner circumferential surface of the sealing wall 122 and the tip surface of the groove forming portion.
  • the pair of groove forming portions may be configured to protrude from the outer peripheral surface of the sealing wall portion 122.
  • the thickness dimension D21 of the sealing wall portion 122 corresponds to the inner peripheral surface of the sealing wall portion 122 and the bottom surface of the holding groove 25a. It becomes the separation distance.
  • the O-ring 26 is a seal member that restricts intake air from leaking out of the airflow insertion hole 12 b by being in close contact with the sealing wall 122 side and the intake pipe 12 a side, and the O-ring 26 26 can also be referred to as a packing member.
  • the ring holding portion 25 corresponds to the seal holding portion.
  • both the outer peripheral end and the inner peripheral end of the cross section are generally flat. This differs from the sealing wall portion 122 in that the outer peripheral surface of the housing wall portion 121 does not face the inner peripheral surface of the airflow insertion hole 12b, and the outer peripheral end of the sealing wall portion 122 has the shape of the airflow insertion hole 12b. It is not necessary to match the shape of. Due to the fact that both the outer peripheral end and the inner peripheral end of the housing wall 121 are flat as described above, in the housing wall 121, the thickness dimension D22 is substantially uniform in the circumferential direction. In other words, in the accommodation wall portion 121, in order to make the thickness dimension D22 uniform in the circumferential direction, the shape of the outer peripheral surface is set according to the shape of the inner peripheral surface.
  • the housing wall 121 is thinner than the sealing wall 122 as a whole. Comparing the thickness of the housing wall 121 and the sealing wall 122, although there is a portion where the sealing wall 122 is thicker than the housing wall 121, the sealing wall 122 is a housing wall. There is no portion thinner than 121. That is, the thickness dimension D21 of the thickest portion of the sealing wall portion 122 is larger than the thickness dimension D22 of any portion of the housing wall portion 121, and the thickness dimension D21 of the thinnest portion of the sealing wall portion 122 is It is not smaller than the thickness dimension D22 of any part of the wall 121.
  • the overhanging portion 66 a is thinner as a whole than the sealing wall portion 122, and of course, thinner as a whole as compared to the housing wall portion 121. Comparing the thickness of the overhanging portion 66a and the accommodation wall portion 121, although there is a portion where the accommodation wall portion 121 is thicker than the overhanging portion 66a, the accommodation wall portion 121 becomes thinner than the overhanging portion 66a There is no part that exists.
  • the area step surface 66 is formed by the end face of the housing wall 121 on the housing base end side.
  • the circuit step surface 55 of the sensor SA 50 is hooked on the region step surface 66, and the region step surface 66 is in contact with the sensor SA 50 so that the sensor SA 50 is not moved to the housing side.
  • the position is held in the vertical direction Y.
  • the region step surface 66 is a surface orthogonal to the height direction Y, and corresponds to a third holding portion.
  • the circuit step surface 55 corresponds to a unit contact portion in contact with the region step surface 66.
  • the area step surface 66 can be referred to as a positioning surface that determines or positions the sensor SA 220.
  • the area step surface 66 is also formed by an end face of the housing wall 121 on the housing base end side and a surface of the laterally extending part 66 b on the housing base end side. Therefore, if the circuit step surface 55 of the sensor SA 50 is caught on the area step surface 66, it may be in contact with not only the housing wall portion 121 but also the laterally extending portion 66b.
  • the housing main body 24 has the housing protrusions 72a and 72b for holding the sensor SA50 in position (see FIGS. 14 and 15), and the housing protrusions 72a and 72b are included in the housing wall 121.
  • the SA side surface 126 of the sensor SA 50 includes inclined surfaces 126 a and 126 b which are inclined without being orthogonal to the depth direction Z.
  • the inclined surfaces 126a and 126b are included in the outer peripheral surface of the relay portion 52 of the sensor SA50.
  • the front inclined surface 126a faces the front side of the sensor SA50
  • the back inclined surface 126b faces the back of the sensor SA50.
  • the width housing projection 72a When the width direction X corresponds to the first direction, the width housing projection 72a is in contact with the SA plate surface 125, thereby holding the sensor SA50 in the width direction X, and corresponds to the first holding portion. . This is because the SA plate surface 125 is orthogonal to the width direction X.
  • the depth housing projection 72b contacts the front inclined surface 126a, thereby holding the sensor SA50 in both the width direction X and the depth direction Z.
  • the sensor SA50 is held in position in all in the width direction X, height direction Y and depth direction Z by being in contact with the area step surface 66 of the housing wall 121 and the housing protrusions 72a and 72b.
  • the housing wall portion 121 has a first holding portion, a second holding portion, and a third holding portion, and corresponds to a position holding portion.
  • At least a part of the contact portion between the housing wall 121 and the sensor SA50 is joined by adhesion using an adhesive or welding using a molten resin.
  • the area step surface 66 of the housing wall 121 and the circuit step surface 55 of the sensor SA 50 are joined, and this joint portion extends annularly along the peripheral portion of the sensor SA 50.
  • thermosetting resin acts as the area step surface 66 and the circuit step surface 55 when the potting portion 65 is formed. Leakage from the sealing area PA is suppressed.
  • unintended deformation may occur in the housing 21 as the molten resin is cured.
  • Unintended deformations include sink marks and warps, and sink marks are depressions and dents etc. that occur as the molten resin cures, and warps are caused by residual stress or residual strain due to temperature differences when the molten resin cures. This is deformation or the like after injection that occurs.
  • the housing wall 121 is thinner as a whole than the sealing wall 122, deformation due to resin molding is less likely to occur compared to the sealing wall 122.
  • step difference surface 66 and housing protrusion 72a, 72b are contained in the accommodation wall part 121 instead of the sealing wall part 122. As shown in FIG. That is, the area step surface 66 and the housing projections 72 a and 72 b are provided closer to the front end of the housing than the ring holding portion 25 and the flange portion 27. In this case, positional deviation of the sensor SA 50 and the flow rate detection unit 22 is less likely to occur due to unintended deformation accompanying resin molding, and the detection accuracy of the flow rate detection unit 22 is less likely to decrease.
  • the separation distance L3 between the flow rate detection unit 22 and the circuit step surface 55 is the separation distance L4 between the end on the housing base end side and the circuit step surface 55. It is smaller. That is, in the height direction Y, the circuit step surface 55 is provided at a position closer to the flow rate detection unit 22.
  • the sensor SA 50 rotates with the contact portion with the housing wall portion 121 as a fulcrum, as the rotation radius of the flow rate detection unit 22 is smaller, the positional shift of the flow rate detection unit 22 in the width direction X and the depth direction Z The amount is smaller.
  • the separation distance L3 between the circuit step surface 55 and the flow rate detection unit 22 in the height direction Y the smaller the displacement amount of the flow rate detection unit 22, and the detection accuracy of the flow rate detection unit 22 is less likely to decrease. Become.
  • the separation distance between the central portion of the detection element 22b of the flow amount detection unit 22 and the circuit step surface 55 in the height direction Y is the separation distance L3.
  • the separation distance L3 may be a value indicating the degree of separation between the flow rate detection unit 22 and the circuit step surface 55.
  • the circuit base step end portion of the flow rate detection unit 22 and the circuit step The distance from the surface 55 may be set.
  • the volume V1 of the accommodation area PB1 is smaller than the volume V2 of the sealing area PA because the separation distance L3 is smaller than the separation distance L4.
  • the circuit step surface 55 may be provided closer to the flow rate detection unit 22 in the height direction Y Is high.
  • a region between the region step surface 66 in the height direction Y and the end on the housing tip end of the sensor SA50 is referred to as a detection region PB3 containing the flow rate detection unit 22.
  • the volume V3 of the detection area PB3 is smaller than the volume V2 of the sealing area PA.
  • the volume V3 of the detection area PB3 is larger than the volume V1 of the accommodation area PB1.
  • the detection area PB3 is an area including the entire accommodation area PB1 and the portion on the housing proximal end side of the measurement area PB2.
  • the sensor SA50 When deformation caused by resin molding occurs even in the housing wall 121, if the operator inserts the sensor SA50 into the inside of the housing wall 121 when manufacturing the air flow meter 14, the sensor according to the deformation of the housing wall 121 There is a concern that the SA50 may be distorted. For example, when the upstream side portion and the downstream side portion of the area stepped surface 66 are displaced in the height direction Y, the upstream side portion and the downstream side portion of the circuit stepped surface 55 are located in the height direction Y There is a concern that the sensor SA 50 may distort. In this case, if the position of the flow rate detection unit 22 deviates from the designed position due to the distortion of the sensor SA50, the detection accuracy of the flow rate detection unit 22 tends to be degraded.
  • the flow volume detection part 22 is arrange
  • the SA protrusions 71a and 71b are provided between the circuit step surface 55 and the flow rate detection unit 22 in the height direction Y. Also from this, the flow rate detection unit 22 is a circuit step surface. It can be said that it is arranged as far as possible from 55.
  • the SA protrusions 71a and 71b extend in the height direction Y, and the distance dimension between the circuit step surface 55 and the flow rate detection unit 22 in the height direction Y is larger than the longitudinal dimension of the SA protrusions 71a and 71b. There is. Therefore, even if deformation due to resin molding occurs in the area step surface 66, it is difficult for the strain to reach the flow rate detection unit 22 in the sensor SA50.
  • the flow rate detection unit 22 is separated from the ring holding unit 25 by being located as far as possible from the circuit step surface 55. In this case, even if heat is applied from the internal combustion engine 11 or the like outside the intake pipe 12a to the housing main body 24, the flange portion 27, and the potting portion 65 in the air flow meter 14, this heat is hardly transmitted to the flow rate detection portion 22 It has become. For this reason, the heat from the outside of the intake pipe 12a is less likely to cause the detection accuracy of the flow rate detection unit 22 to decrease.
  • the flow rate detection unit 22 is disposed at a position far from the accommodation wall 121 in the depth direction Z as much as possible.
  • the separation distance L5 between the flow rate detection unit 22 and the accommodation wall 121 in the depth direction Z is larger than the thickness dimension D23 of the accommodation wall 121.
  • the separation distance L5 is larger than the thickness dimension D23 of the thickest portion of the housing wall 121.
  • the flow rate detection unit 22 is disposed at the center position of the accommodation area PB1 in the depth direction Z. Therefore, the separation distance L5 is 1/2 of the depth dimension D6 (see FIG. 8) of the accommodation area PB1 in the depth direction Z. It has become.
  • the projecting dimension of the housing projections 72a and 72b is included in the thickness dimension D23 in the portion where the housing projections 72a and 72b are present.
  • the separation distance between the central portion of the flow rate detection unit 22 and the inner peripheral surface of the accommodation wall 121 in the depth direction Z is the separation distance L5.
  • the separation distance L5 may be a value indicating the degree of separation between the flow rate detection unit 22 and the accommodation wall 121 in the depth direction Z.
  • the separation distance L5 may be different between the flow rate detection unit 22 and the accommodation wall 121 in the depth direction Z It may be a gap dimension.
  • the sensor SA50 is inserted from the housing opening 61 into the internal space 24a.
  • the front SA protrusion 71a deforms the width housing protrusion 72a
  • the relay portion 52 deforms the depth housing protrusion 72b.
  • the housing opening 61 corresponds to a housing opening for housing the sensor SA 50 in the internal space 24 a.
  • the tip end surface of the width housing protrusion 72a is in contact with the tip end surface of the front SA protrusion 71a, so that movement of the sensor SA50 in the width direction X to the side approaching the width housing protrusion 72a is restricted.
  • movement of the sensor SA50 away from the width housing protrusion 72a is restricted by the fact that the back SA protrusion 71b of the sensor SA50 is in contact with the inner circumferential surface of the housing wall 121.
  • the tip end surface of the width housing protrusion 72a or the portion in contact with the back SA protrusion 71b on the inner circumferential surface of the housing wall 121 can be referred to as a positioning surface.
  • the tip surface of the depth housing protrusion 72b is in contact with the upstream end surface of the relay portion 52, so that the sensor SA50 approaches the depth housing protrusion 72b in both the width direction X and the depth direction Z It is regulated to move.
  • movement of the sensor SA50 away from the depth housing protrusion 72b is restricted by the fact that the downstream side surface of the sensor SA50 is in contact with the inner circumferential surface of the accommodation wall 121.
  • the distal end surface of the depth housing projection 72b or the portion of the inner peripheral surface of the housing wall 121, which is in contact with the downstream end surface of the sensor SA50 can be referred to as a positioning surface.
  • the circuit step surface 55 of the sensor SA 50 is in contact with the region step surface 66 of the housing 21, movement of the sensor SA 50 in the height direction Y to the front end side of the housing is restricted.
  • the movement of the sensor SA50 to the proximal end side of the housing is restricted by the fact that the relay portion 52 of the sensor SA50 is fitted inside the accommodation wall portion 121.
  • thermosetting resin such as a potting resin is injected into the internal space 24a, and the potting portion 65 is formed by curing the thermosetting resin. In this case, movement of the sensor SA 50 to the proximal side of the housing is also restricted by the potting portion 65.
  • the housing wall 121 of the housing 21 is separated from the ring holding portion 25 toward the front end of the housing. For this reason, while the ring holding portion 25 can be made thicker to improve its strength, the housing wall portion 121 can be made thinner so as not to cause deformation due to resin molding. As described above, since the thickness of the housing wall 121 is reduced, the shape of the housing wall 121 is less likely to vary among products. Therefore, the position of the sensor SA 50 positioned by the housing wall 121 It also becomes less likely to occur. Therefore, it can be suppressed that the detection accuracy of the flow rate detection unit 22 varies from product to product.
  • the housing opening 61 is provided closer to the housing proximal end than the region step surface 66.
  • the housing 21 there is a concern that the housing main body 24 is unintentionally deformed due to the relatively low strength of the portion where the housing opening 61 is formed.
  • the strength of the housing 21 is enhanced by the sealing wall portion 122, the ring holding portion 25 and the flange portion 27 on the housing base end side of the area step surface 66 in the housing 21. Therefore, by forming the housing opening 61 in the portion of the housing 21 that can easily ensure the strength on the housing proximal side rather than the area step surface 66, the housing main body 24 is unintentionally deformed due to the presence of the housing opening 61. Can be suppressed. As a result, it is possible to suppress the occurrence of the positional deviation of the sensor SA50 due to the deformation of the housing main body 24.
  • both the width housing protrusion 72 a that restricts the movement of the sensor SA 50 in the width direction X and the depth housing protrusion 72 b that restricts the movement of the sensor SA 50 in the depth direction Z Is included in
  • the housing wall portion 121 deformation due to resin molding is difficult to occur also in the housing projections 72a and 72b, so that the position of the sensor SA50 varies in each product in the width direction X and the depth direction Z Can be suppressed.
  • most of the inner circumferential surface of the housing wall 121 is not in contact with the outer circumferential surface of the sensor SA50, but a limited portion called the tip of the housing protrusions 72a and 72b is the sensor SA50. It is in contact with the outer peripheral surface.
  • this deformation does not necessarily cause the positions of the housing protrusions 72a and 72b to shift and the housing protrusions 72a and 72b themselves to be deformed.
  • the variation in position hardly causes variation in the position of the sensor SA50. Therefore, the variation in the position of the sensor SA50 for each product can be suppressed more reliably.
  • the housing wall portion 121 includes the area step surface 66 that restricts the movement of the sensor SA 50 in the height direction Y to the housing tip end side.
  • the accommodation wall portion 121 deformation due to resin molding is less likely to occur in the area step surface 66 as well, so that the position of the sensor SA50 in the height direction Y can be prevented from being dispersed among products.
  • the circuit step surface 55 is provided between the lead terminal 54 and the flow amount detection unit 22 at a position closer to the flow amount detection unit 22.
  • the sensor SA 50 is displaced so as to pivot about the contact portion with the area step surface 66 as compared with the configuration in which the circuit step surface 55 is provided at a position near the lead terminal 54, for example.
  • the positional displacement amount of the flow rate detection unit 22 can be reduced. For this reason, the fall of the detection accuracy of flow rate detection part 22 can be controlled.
  • the housing wall portion 121 can be separated from the ring holding portion 25 toward the front end of the housing.
  • the deformation is absorbed by the overhanging portion 66a, whereby the position of the housing wall portion 121 or the deformation of the ring holding portion 25 or It is less likely that the shape changes. For this reason, it can suppress that the positioning accuracy of sensor SA50 by area
  • the separation distance L3 between the flow rate detection unit 22 and the area step surface 66 is larger than the thickness dimension D22 of the laterally extending portion 66b, the flow rate detection unit 22 in the height direction Y is A configuration as far as possible can be realized. According to this configuration, even if deformation due to resin molding occurs in the area step surface 66, distortion caused in the sensor SA50 by being fitted to the inside of the accommodation wall 121 is not detected until the flow rate detection unit 22. It becomes difficult to reach. For this reason, even if distortion of sensor SA50 arises when assembling sensor SA50 to housing 21, it can control that position shift of flow rate detection part 22 arises.
  • the flow rate detection unit 22 is made as far as possible from the accommodation wall 121 in the depth direction Z. Can be realized. According to this configuration, even if deformation due to resin molding occurs in the housing protrusions 72a and 72b, the distortion generated in the sensor SA50 by being fitted inside the accommodation wall portion 121 is up to the flow rate detection portion 22. Will be difficult to reach. For this reason, it can suppress that the position shift of the flow volume detection part 22 arises by distortion of sensor SA50.
  • the senor SA 50 is inserted into the internal space 24 a through the housing opening 61. As described above, even when the sensor SA 50 is retrofitted to the resin-molded housing 21, the sensor by the housing wall 121 is less likely to cause the deformation due to the resin molding in the housing wall 121. The positioning accuracy of the SA 50 can be enhanced.
  • the passage 31 does not extend further downstream than the passage boundary 34 in the depth direction Z.
  • the portion between the passage boundary portion 34 and the inflow port 33 a in the depth direction Z is the inflow passage 31 a, while the passage boundary portion 34 and the flow in the depth direction Z
  • a portion of the flow path boundary portion 34 and a portion of the outflow port 33 b overlap, and the flow path boundary portion 34 extends from the outflow port 33 b toward the inflow port 33 a in the depth direction Z.
  • the flow path boundary portion 34 corresponds to a branch boundary portion.
  • the inner circumferential surface of the passage 31 includes a passing ceiling surface 151, a passing floor surface 152, and a passing wall surface 153.
  • the passage ceiling surface 151 and the passage floor surface 152 are opposed to each other across the passage flow path 31 in the height direction Y, and the passage ceiling surface 151 is disposed closer to the housing proximal end than the passage flow path 31.
  • the passing ceiling surface 151 faces the housing distal end, and the passing floor surface 152 faces the housing proximal end.
  • the passage wall surface 153 is provided in a pair in the width direction X with the passage ceiling surface 151 and the passage floor surface 152 interposed therebetween, and the passage wall surfaces 153 face each other in the direction of the width direction X.
  • the inner circumferential surface of the passage channel 31 has throttling surfaces 152a and 153a which squeeze the passage channel 31 from the inlet 33a to the outlet 33b.
  • the flow passage area of the passage 31 is gradually reduced toward the outlet 33 b.
  • the throttling surfaces 152a and 153a are included in the inner circumferential surface of the outflow passage 31b, and extend from the outlet 33b toward the inflow passage 31a.
  • the throttling surfaces 152a and 153a are inclined with respect to the depth direction by facing the inlet 33a.
  • the throttling surfaces 152a and 153a extend over the upstream end and the downstream end of the outflow passage 31b, but are not included in the inner circumferential surface of the inflow passage 31a.
  • the cross section of the passage 31 is smaller as it approaches the outlet 33b in the outflow passage 31b.
  • the floor throttling surface 152 a is included in the passage floor surface 152, and the wall throttling surface 153 a is included in the passage wall surface 153.
  • the floor throttling surface 152 a is an inner circumferential surface of a portion of the housing bottom 62 that is inclined with respect to the depth direction Z.
  • the wall throttling surface 153a is an inner peripheral surface of the passage throttling portion 47, and a pair of wall throttling surfaces 153a is provided across the floor throttling surface 152a in the width direction X.
  • the floor throttling surface 152a and the wall throttling surface 153a correspond to the passage throttling surface.
  • the flow path boundary portion 34 is inclined with respect to the depth direction Z by facing the outlet 33 b. That is, the flow path boundary portion 34 is inclined with respect to the passing ceiling surface 151.
  • the flow path boundary portion 34 faces the floor squeezing surface 152 a with the outlet 33 b interposed therebetween, and extends parallel to the floor squeezing surface 152 a.
  • the outer peripheral surface of the housing 21 includes a wedging surface 154 extending outward from the overlapping portion of the inlet 33 a and the flow path boundary portion 34.
  • the weir surface 154 is disposed on the opposite side of the passage ceiling surface 151 across the flow path boundary portion 34 in the depth direction Z, and extends in the depth direction Z in the same manner as the passage ceiling surface 151. For this reason, the floor throttling surface 152a is also inclined with respect to the weir surface 154. Note that the weir surface 154 does not form the passage channel 31 due to the fact that the passage wall surface 153 is not connected to the weir surface 154.
  • the outer peripheral surface of the passage mold portion 104 has a floor draw forming surface 156 for forming the floor draw down surface 152a and a wall draw forming surface 157 for forming the wall draw down surface 153a. have.
  • the passage mold portion 104 has an outer passage surface 158 which abuts on the outer peripheral mold portions 102 and 103 in a state where the mold device 90 is assembled. It is a face.
  • the floor draw molding surface 156 and the wall draw molding surface 157 extend in the depth direction Z from the outer passage surface 158 of the passage mold part 104.
  • the provision of the molding surfaces 156 and 157 causes the pass-through mold portion 104 to be thinner as it approaches the outer pass-through surface 158.
  • a pair of wall draw forming surfaces 157 is provided across the floor draw forming surface 156 in the width direction X.
  • the floor drawing forming surface 156 and the wall drawing forming surface 157 correspond to a die drawing part.
  • the outer peripheral surface of the passage mold portion 104 has an inner passage surface 159 that abuts on the introductory molding portion 97b in a state where the mold apparatus 90 is assembled.
  • the inner passage surface 159 is disposed on the opposite side of the wall draw molding surface 157 and the outer passage surface 158 in the passage mold portion 104, and is orthogonal to the outer passage surface 158.
  • the floor draw molding surface 156 is inclined relative to the inner passage surface 159.
  • the introduction molding unit 97 b is included in the measurement molding unit 97
  • the measurement molding unit 97 is included in the inner peripheral mold unit 91.
  • the inner peripheral mold portion 91 corresponds to a measurement mold portion and a branch mold portion for molding the inner peripheral surface of the measurement flow channel 32.
  • the measurement and molding unit 97 is in contact with both the passing mold portion 104 and the outer peripheral mold portions 102 and 103.
  • the outer peripheral surface of the measurement and molding portion 97 has an outer measurement surface 161 in contact with the outer peripheral mold portions 102 and 103 in the mold apparatus 90 and an inner measurement surface 162 in contact with the inner passage surface 159 of the pass mold portion 104.
  • the tip end portion of the measurement molding portion 97 enters the passage 31, so the outer measurement surface 161 and the inner measurement surface 162 are the passage It is arranged inside 31.
  • the outer passage surface 158 of the passage die unit 104 and the outer measurement surface 161 of the measurement molding unit 97 form the same plane, and this plane is included in the outlet 33 b.
  • a portion that has entered to enter the passage 31 is referred to as an entry portion 163, and this entry portion 163 is illustrated by dot hatching in FIG.
  • a mold boundary 165 is formed, which is a boundary between The mold boundary portion 165 extends in the width direction X, and the mold boundary portion 165 includes the boundary portion between the outer measurement surface 161 and the inner measurement surface 162 of the measurement and molding portion 97.
  • the mold boundary portion 165 is disposed in the housing 21 at the outlet 33 b of the passage 31.
  • the boundary between the three mold portions of the measurement molding portion 97, the passage mold portion 104 and the second outer peripheral mold portion 103 is a mold boundary. It can be referred to as part 165.
  • the outer peripheral mold portions 102 and 103 are removed from the outer peripheral surface of the housing 21 after the passage mold portion 104 is removed from the inlet 33 a of the housing 21. Either of the operation for removing the inner peripheral mold portion 91 from the housing 21 and the operation for removing the passage mold portion 104 from the housing 21 may be performed first.
  • the inner peripheral surface of the passage flow path 31 is integrally molded by using the mold device 90 in resin molding of the housing 21. For this reason, there is no need to form the passage channel 31 by combining a plurality of members separately after resin molding. In this case, at the boundary between the members, a step is not easily generated on the inner circumferential surface of the passage flow passage 31 and the shape and size of the passage passage 31 are less likely to vary for each product. By thus suppressing the manufacturing variation, the detection accuracy of the flow rate detection unit 22 can be enhanced.
  • the outer peripheral mold portions 102 and 103 are removed from the outer peripheral surface of the housing 21 after the passage mold portion 104 is removed from the inlet 33 a of the housing 21. Remove.
  • the outer peripheral portion of the housing 21 is protected by the outer peripheral mold portions 102 and 103. For this reason, even if it is pulled out from the inflow port 33a while pricking the passing mold portion 104 so that the tip portion of the passing mold portion 104 swings in the width direction X and the height direction Y, the housing 21 is removed by the passing mold portion 104. It is less likely to cause deformation from the inner circumferential side. Therefore, it is possible to prevent the housing 21 from being deformed or broken unintentionally when the pass-through portion 104 is removed from the housing 21.
  • the entry portion 163 of the measurement and molding unit 97 is in the state of entering the passage flow path 31. That is, the mold boundary portion 165 is formed inside the passage 31.
  • the shape of the passage 31 is formed in the mold device 90 in which the passage die unit 104 is not extracted from the outlet 33 b by molding a part of the inner peripheral surface of the passage 31 by the measurement molding unit 97.
  • the degree of freedom in designing and manufacturing can be increased. Therefore, as in the present embodiment, it is possible to realize the housing 21 in which the flow path boundary portion 34 faces the outlet 33 b side.
  • the pass-through portion 104 gradually narrows toward the end portion forming the outer passing surface 158. That is, the passage mold portion 104 is shaped so as not to increase in thickness. For this reason, when resin molding of the housing 21 is performed in a state where the passage mold portion 104 and the outer peripheral mold portions 102 and 103 are assembled to each other, the passage mold portion 104 is directed to the opposite side to the outer passage surface 158 and the housing 21 is Can be extracted from the inflow port 33a. In this case, the inner peripheral surface of the passage 31 can be integrally molded using the passage mold portion 104.
  • the passage die part 104 since the floor draw forming surface 156 and the wall draw form forming surface 157 are included in the outer peripheral surface of the passage die part 104, the passage die part 104 gradually narrows toward the outer passage face 158. Can be realized. In this case, the area of the portion extending in parallel to the depth direction Z, which is the drawing direction of the passage mold portion 104, on the inner peripheral surface of the passage flow passage 31 is reduced by the floor drawing surface 156 and the wall drawing surface 157 . Therefore, the passage mold portion 104 can be easily pulled out from the inside of the passage flow path 31.
  • the passage 31 in the depth direction Z, is not narrowed from the outlet 33 b toward the inlet 33 a.
  • the passage mold portion 104 can be removed from the inflow port 33a, so it is necessary to form the passage flow path 31 by combining a plurality of members.
  • the passage die 104 is caught on the inner peripheral surface of the passage 31 and the like, and the passage die 104 is formed into the inlet 33a. It becomes difficult to pull it out.
  • the passage channel 31 is formed by combining a plurality of members, the manufacturing variation of the passage channel 31 as described above is likely to occur.
  • the degree of throttling of the passage flow path 31 can be increased toward the outlet 33b. it can.
  • the floor throttling surface 152a and the wall throttling surface 153a extend from the outlet 33b toward the inlet 33a, the degree of throttling of the outlet 33b in the passage 31 can be maximized.
  • the flow velocity of air in the measurement flow path 32 can be appropriately increased by squeezing the outlet 33 b.
  • the passage mold portion 104 since the outflow port 33b extends from the flow path boundary portion 34, when the resin molding of the housing 21 is performed, the passage mold portion 104 needs to be extended to the outflow port 33b side from the flow path boundary portion 34 Absent. In this case, a portion of the passage flow passage 31 aligned in the height direction Y with the flow passage boundary portion 34 can be molded not only by the passage mold unit 104 but also by the measurement molding unit 97. For this reason, when forming the housing 21 using the mold apparatus 90 which does not extract the pass-through mold part 104 from the outflow port 33b, the degree of freedom in design and manufacture regarding the positional relationship between the flow path boundary portion 34 and the outflow port 33b. Can be enhanced.
  • the flow path boundary portion 34 extends from the outflow port 33 b, in the configuration in which the inner peripheral surface of the passage flow path 31 is integrally molded, the flow path boundary portion 34 faces the outflow port 33 b side Can be inclined relative to the depth direction Z. In this case, the foreign matter which has entered the passage 31 from the inflow port 33a can not reach the flow path boundary portion 34 only by proceeding straight to the outflow port 33b. For this reason, it can suppress that a foreign material approachs into measurement channel 32 from passage channel 31.
  • the connector portion 28 of the air flow meter 14 has a connector recess 171 formed by recessing the tip end surface.
  • the connector opening 171a opens the internal space of the connector recess 171 in the depth direction Z.
  • the height direction Y corresponds to the direction in which the detection unit and the housing opening are arranged.
  • the connector opening 171 a may open the internal space of the connector recess 171 in the width direction X or the height direction Y.
  • the connector terminal 28a is bridged between the connector recess 171 and the inner space 24a.
  • the connector terminal 28a includes a first terminal portion 172a disposed inside the connector recess 171, a second terminal portion 172b disposed in the internal space 24a, and a connection terminal portion 172c connecting the terminal portions 172a and 172b.
  • a connection terminal portion 172c connecting the terminal portions 172a and 172b.
  • the first terminal portion 172 a extends toward the connector opening 171 a inside the connector recess 171.
  • the second terminal portion 172 b extends toward the housing opening 61 in the internal space 24 a, but does not protrude from the housing opening 61 to the outside.
  • the portion protruding from the inner peripheral surface of the housing 21 to the inside of the connector recess 171 is the first terminal portion 172a
  • the portion protruding from the inner peripheral surface of the housing 21 to the inner space 24a is the second terminal portion 172b. Therefore, the entire connection terminal portion 172 c is embedded in the housing 21 between the internal space 24 a and the connector recess 171.
  • the connection terminal portion 172 c may be at least partially embedded in the housing 21. Even in this case, the connection terminal portion 172c can be fixed to the housing 21.
  • the SA main body 170 includes the flow rate detection portion 22.
  • the lead terminal 54 extends from the SA main body 170 toward the housing opening 61 in the height direction Y, but does not protrude from the housing opening 61 to the outside.
  • the SA main body 170 corresponds to a unit main body.
  • the internal space 24a has a main body area PC1 in which the SA main body 170 is accommodated, and a connector area PC2 in which the second terminal portion 172b of the connector terminal 28a is accommodated.
  • the main body area PC1 and the connector area PC2 are disposed side by side in the width direction X which is a direction orthogonal to the height direction Y, and both extend from the housing opening 61 toward the front end of the housing.
  • the main body area PC1 includes an area extending over the area step surface 66 and the housing opening 61 in the height direction Y, and the connector area PC2 has the sealing step surface 67 and the housing opening in the height direction Y. It is the area passed over with the part 61.
  • the boundary between the area step surface 66 and the sealing step surface 67 in the width direction X which is a direction orthogonal to the height direction Y, is included in the boundary between the main body area PC1 and the connector area PC2.
  • a pair of region step surfaces 66 is provided across the internal space 24 a in the width direction X.
  • the connector area PC2 is disposed at a position spaced apart from the SA main body 170 toward the housing opening 61 in the height direction Y. This is because the sealing step surface 67 is disposed between the housing opening 61 and the SA main body 170 in the height direction Y.
  • the second terminal portion 172b of the connector terminal 28a extends from the sealing step surface 67 toward the housing opening 61.
  • the connection terminal portion 172c is not exposed to the connector area PC2.
  • a portion of the portion extending from the connection terminal portion 172c toward the housing opening 61 and disposed in the connector area PC2 forms a second terminal portion 172b.
  • the second terminal portion 172b corresponds to the protruding terminal portion and the vertical terminal portion.
  • the connector terminal 28 a does not enter between the housing opening 61 and the sensor SA 50 in the height direction Y. This is because the second terminal portion 172b does not protrude from the connector area PC2 to the main body area PC1. That is, the connector terminal 28a does not protrude into the main body region PC1.
  • the circuit step surface 55 of the sensor SA 50 is caught on the area step surface 66 from the side of the housing opening 61. Further, the bridge terminal 86 of the terminal unit 85 is hooked to the sealing step surface 67 from the housing opening 61 side.
  • both the area step surface 66 and the sealing step surface 67 are included in the inner peripheral surface of the housing 21.
  • the area step surface 66 corresponds to a unit holding surface that holds the position of the sensor SA 50 in the height direction Y
  • the sealing step surface 67 corresponds to a terminal holding surface that holds the position of the bridge terminal 86 in the height direction Y Do.
  • the bridge terminal 86 corresponds to the connection terminal.
  • the bridge terminal 86 has a first bridge portion 173a connected to the lead terminal 54, a second bridge portion 173b connected to the connector terminal 28a, and a connection bridge portion 173c connecting the bridge portions 173a and 173b. There is.
  • the bridge terminal 86 straddles the boundary between the main body area PC1 and the connector area PC2 in the width direction X.
  • the first bridge portion 173a extends along the lead terminal 54 in the body region PC1
  • the second bridge portion 173b extends along the second terminal portion 172b of the connector terminal 28a in the connector region PC2.
  • the connection bridge portion 173c is in a state of being passed over the main body area PC1 and the connector area PC2.
  • the second bridge portion 173 b is inserted between the sealing step surface 67 and the housing opening 61, and at least one of the second bridge portion 173 b and the connection bridge portion 173 c is in contact with the sealing step surface 67.
  • the sealing step surface 67 supports the connection portion between the second bridge portion 173b and the second terminal portion 172b.
  • the first bridge portion 173a includes a second connection portion 86b (see FIG. 18 and the like), and a portion including the second connection portion 86b is a connection portion between the first bridge portion 173a and the lead terminal 54.
  • the second bridge portion 173b includes a first connection portion 86a (see FIG. 18 and the like), and a portion including the first connection portion 86a is a connection between the second bridge portion 173b and the second terminal portion 172b. It is a part.
  • the plurality of lead terminals 54 included in the sensor SA 50 include terminals electrically connected to the intake air temperature terminal 23c.
  • the intake air temperature terminal 23c is also connected to the lead terminal 54 through the bridge terminal 86.
  • the intake air temperature terminal 23c has an intake air temperature terminal portion 175 which protrudes from the sealing step surface 67 to the connector area PC2 and extends toward the housing opening 61.
  • the intake air temperature terminal portion 175 is also disposed in the connector region PC2 in a state of not protruding into the main body region PC1.
  • FIG. 36 illustrates the mold device 90 when the outer peripheral surface of the second outer peripheral mold portion 103 is viewed from the side opposite to the first outer peripheral mold portion 102.
  • the mold device 90 has a connector mold portion 177 assembled to the inner peripheral mold portion 91 and the second outer peripheral mold portion 103.
  • the connector mold portion 177 is assembled to the outer peripheral surface of the second outer peripheral mold portion 103 in a state where it enters into the inner peripheral mold portion 91, thereby molding the inner peripheral surface of the connector portion 28.
  • the connector mold portion 177 of the present embodiment is formed as a separate member with respect to the inner peripheral mold portion 91 and the second outer peripheral mold portion 103.
  • the connector mold portion 177 may be integrally attached to the inner peripheral mold portion 91 or the second outer peripheral mold portion 103. In this case, the connector mold portion 177 may be connected to the inner peripheral mold portion 91 or the second outer peripheral mold portion 103. Part 177 will be included.
  • the mold device 90 has a temporary support 178 for temporarily supporting the connector terminal 28a and the intake air terminal 23c, and can temporarily attach the connector terminal 28a and the intake air terminal 23c to the temporary support 178.
  • the temporary support portion 178 is included in, for example, the connector mold portion 177, and the connector terminal 28a and the intake air temperature terminal 23c can be attached and detached.
  • the temporary support 178 is capable of transitioning to a supported state capable of supporting the terminals 28 a and 23 c and a released state in which the terminals 28 a and 23 c are released from support.
  • the connector terminal 28a is accommodated inside the connector mold portion 177, while the intake air temperature terminal 23c extends between the connector mold portion 177, the second outer peripheral mold portion 103, and the root mold portions 105, 106. It has been passed.
  • insert molding is performed to resin-mold the housing in which the connector terminal 28a and the intake air temperature terminal 23c are embedded.
  • the connector terminal 28a and the intake air temperature terminal 23c are temporarily attached to the temporary support 178 of the connector mold 177.
  • the connector mold portion 177 in this state is assembled to the inner peripheral mold portion 91, the outer peripheral mold portions 102, 103, and the like.
  • a molten resin is injected into the inside of the mold device 90, and the molten resin is cured to mold the housing 21.
  • the mold device 90 is removed from the housing 21.
  • the connector terminal 28a and the intake air temperature terminal 23c are removed from the temporary support 178 by moving the temporary support 178 to a released state or the like, and the connector mold 177 is removed from the connector 28 of the housing 21.
  • the inner peripheral mold portion 91 and the outer peripheral mold portions 102 and 103 are also removed from the housing 21.
  • a part of each of the connector terminal 28 a and the intake air terminal 23 c is embedded in the housing 21.
  • the process of installing the sensor SA 50 in the internal space 24 a of the housing 21 is performed.
  • the sensor SA50 is inserted from the housing opening 61 into the main body area PC1 of the internal space 24a, and the sensor SA50 is pushed until the circuit step surface 55 of the sensor SA50 is caught on the area step surface 66 of the housing 21.
  • the lead terminal 54 is disposed in the sealing area PA of the internal space 24a.
  • the housing 21 is resin-molded so that the entire connection terminal portion 172c of the connector terminal 28a is embedded in the housing 21. Therefore, in the configuration in which the inner peripheral surface of body region PC1 and connector region PC2 is molded by the inward portion 93 of the inner circumferential mold portion 91, the inward portion 93 is simply extracted from the housing opening 61 to obtain these body region PC1 and connector The area PC2 can be molded.
  • connection terminal portion 172c and the sealing step surface 67 are used. There is a need to wrap around a part of the interposition part 93. In this configuration, it becomes difficult to extract the intruding portion 93 from the housing opening 61, so that it is necessary to assemble and manufacture a plurality of members instead of integrally molding the housing 21.
  • the second terminal portion 172b of the connector terminal 28a and the intake air temperature terminal portion 175 are disposed in the connector area PC2 so as not to protrude into the main body area PC1. Therefore, when the sensor SA50 is inserted into the main body region PC1, the sensor SA50 does not easily come in contact with the second terminal portion 172b or the intake air temperature terminal portion 175.
  • the region step surface 66 faces the housing opening 61 side. Therefore, the operator aims at the space between the pair of area step surfaces 66 and inserts the sensor SA50 so that the sensor SA50 is not in contact with the second terminal portion 172b or the intake air temperature terminal portion 175 in the main body area PC1. It becomes easy to install.
  • the terminal unit 85 is inserted into the internal space 24a from the housing opening 61, and pushed between the lead terminal 54 and the second terminal portion 172b of the connector terminal 28a.
  • the bridge terminal 86 is temporarily attached to the housing 21 by bringing the bridge terminal 86 into contact with the sealing step surface 67.
  • an operation of joining the bridge terminal 86 to each of the lead terminal 54 and the connector terminal 28a by welding or the like is performed using a joint such as a welding device having a pair of welding electrodes.
  • a pair of welding electrodes are inserted into the internal space 24a from the housing opening 61 so that the lead terminals 54 and the first bridge portion 173a are sandwiched by the welding electrodes, and these lead terminals 54 and the first bridge portion 173a Do welding.
  • a connection portion between the lead terminal 54 and the bridge terminal 86 is formed.
  • the second terminal portion 172 b and the second bridge portion 173 b are welded so as to sandwich the second terminal portion 172 b and the second bridge portion 173 b by the pair of welding electrodes. By such a joining operation, a connection portion between the connector terminal 28 a and the bridge terminal 86 is formed.
  • thermosetting resin such as potting resin is applied from the housing opening 61 to the sealing area PA of the internal space 24a. Injection resin. Then, the potting portion 65 is formed by applying heat to the thermosetting resin and curing it.
  • the lead terminal 54, the bridge terminal 86 and the connector terminal 28a are covered with the thermosetting resin as well as the SA main body 170 is covered with the thermosetting resin. In this case, the connection portion between the lead terminal 54 and the bridge terminal 86 and the connection portion between the bridge terminal 86 and the connector terminal 28 a are protected by the potting portion 65.
  • the connector terminal 28 a in the internal space 24 a of the housing 21, the connector terminal 28 a does not enter between the housing opening 61 and the sensor SA 50 in the height direction Y. Therefore, after the connector terminal 28 a is attached to the housing 21, the sensor SA 50 can be inserted into the internal space 24 a from the housing opening 61. In this case, there is no need to perform the operation of attaching the connector terminal 28 a to the housing 21 after the sensor SA 50 is installed in the internal space 24 a. For this reason, it can suppress that position shift of sensor SA50 arises by the impact accompanying attachment of the connector terminal 28a to the housing 21, etc.
  • the position of the flow rate detection unit 22 in the measurement flow channel 32 is also unintentionally displaced.
  • the detection accuracy of the flow rate detection unit 22 is likely to decrease due to the amount and the speed of the intake air flowing along the flow rate detection unit 22 in the measurement flow path 32 deviating from the design values.
  • the positional deviation of the sensor SA 50 is less likely to occur, it is possible to suppress variation in detection accuracy of the flow rate detection unit 22 among products.
  • the second terminal portion 172b of the connector terminal 28a is accommodated in the connector area PC2 in a state where the second terminal section 172b does not protrude into the main body area PC1. Therefore, it is possible to realize a configuration in which the second terminal portion 172b does not enter between the housing opening 61 and the sensor SA50 in the height direction Y.
  • the sensor SA50 is brought into contact with the second terminal portion 172b by simply not advancing the sensor SA50 into the connector area PC2. Can be avoided. Therefore, it is possible to suppress that the sensor SA 50 and the connector terminal 28 a are damaged or deformed due to the contact with each other when the sensor SA 50 is attached to the housing 21.
  • the connector area PC2 is disposed at a position closer to the housing opening 61 than the SA main body 170 of the sensor SA50.
  • the second terminal portion 172 b of the connector terminal 28 a is also disposed closer to the housing opening 61 than the SA main body 170.
  • the connector can be prevented from coming into contact with the SA main body 170 or the housing 21 to damage or deform the SA main body 170 or the housing 21. .
  • the second terminal portion 172 b of the connector terminal 28 a is supported by the sealing step surface 67 from the opposite side to the housing opening 61.
  • the second terminal portion 172b is unlikely to be displaced unintentionally. Therefore, the second terminal portion 172b is displaced relative to the second bridge portion 173b at the time of joining operation, and it is difficult to properly join the second terminal portion 172b and the second bridge portion 173b. Can be suppressed.
  • the bridge terminal 86 is supported by the sealing step surface 67 from the opposite side to the housing opening 61.
  • the bridge terminal 86 is temporarily attached to the housing 21, it is possible to create a state in which the bridge terminal 86 is held in position. For this reason, when joining the bridge terminal 86 to the lead terminal 54 and the connector terminal 28a, the work load can be reduced by the amount that does not require the work of holding the bridge terminal 86 in position.
  • the sealing step surface 67 supporting the second terminal portion 172 b of the connector terminal 28 a is closer to the housing opening 61 than the area step surface 66 supporting the sensor SA 50. It is placed close.
  • the joint portion between the connector terminal 28a and the bridge terminal 86 is disposed between the sealing step surface 67 and the housing opening 61, so the inner space 24a is deeper than the sealing step surface 67.
  • the second terminal portion 172 b extends from the sealing step surface 67 toward the housing opening 61.
  • a bonding tool such as a welding electrode
  • the housing 21 in a state in which the connector terminal 28a is embedded is resin-molded. For this reason, it can suppress that position shift of connector terminal 28a to housing 21 arises.
  • the senor SA 50, the connector terminal 28 a and the bridge terminal 86 are covered with the thermosetting resin injected from the housing opening 61 into the internal space 24 a. Therefore, the positional displacement of the sensor SA 50 and the deformation or breakage of the lead terminal 54, the connector terminal 28a and the bridge terminal 86 can be suppressed by the potting portion 65 formed of the thermosetting resin.
  • the inner peripheral surface of the lip 89 and the inner peripheral surface of the housing main body 24 are flush with each other, and the inner peripheral surface 180 of the sealing area PA It extends straight in the height direction Y from the step surface 67 toward the housing opening 61.
  • the lip 89 extends along the peripheral edge of the internal space 24 a to form a housing opening 61, and corresponds to an opening rib.
  • the sealing area PA including the housing opening 61 is formed in a rectangular shape in plan view as a whole, but the four corners are curved.
  • the inner circumferential surface 180 of the sealing area PA connects the flat inner circumferential surface 181 extending in the width direction X and the depth direction Z to the housing opening 61 and the inner circumferential flat surface 181 intersecting each other.
  • the inner peripheral curved surface 182 is curved so as to expand toward the outer peripheral side so that the housing opening 61 is not formed with an acute angle or a right angled corner portion.
  • the inner peripheral curved surface 182 corresponds to an inner peripheral curved surface which is curved to expand toward the outer peripheral side of the sealing region PA.
  • the inner peripheral flat surface 181 is disposed at the position corresponding to the four sides of the housing opening 61, and the inner peripheral curved surface 182 is disposed at the position corresponding to the four corners. Since the inner circumferential flat surface 181 and the inner circumferential curved surface 182 are continuous with each other, no step is formed at the boundary between the inner circumferential flat surface 181 and the inner circumferential curved surface 182. The inner circumferential flat surface 181 and the inner circumferential curved surface 182 extend from the housing opening 61 toward the area step surface 66 and the sealing step surface 67.
  • the flange portion 27 extends from the housing body 24 in the width direction X and the depth direction Z, and the ring holding portion 25 is disposed closer to the housing tip than the flange portion 27.
  • the lip 89 extends from the housing body 24 toward the proximal end of the housing.
  • the housing attachment portion is configured to include the ring holding portion 25 and the flange portion 27, the lip 89 is disposed on the opposite side of the bypass flow passage 30 and the inlet 33a across the housing attachment portion. It will be.
  • the housing opening 61 is disposed on the opposite side of the sensor SA 50 from the inflow port 33 a.
  • connection portion 183 includes each portion of the lead terminal 54 connected to the bridge terminal 86, a portion of the connector terminal 28a connected to the bridge terminal 86, and the entire bridge terminal 86.
  • the connection portion 183 may include the entire second terminal portion 172 b (see FIG. 34) of the connector terminal 28 a and the entire lead terminal 54.
  • the potting portion 65 corresponds to the filling portion.
  • the sensor SA 50 is installed in the internal space 24 a of the housing 21, and the lead terminal 54 and the connector terminal 28 a are connected using the terminal unit 85. Then, as shown in FIG. 42, a step of injecting the potting material 185, which is a thermosetting resin, into the internal space 24a through the housing opening 61 is performed so as not to overflow the internal space 24a.
  • the inner space 24 a is sealed by filling the inner space 24 a with a liquid or fluid potting material 185.
  • the potting material 185 can also be referred to as a sealing material.
  • an epoxy resin for example, is used as the potting material 185, and the potting material 185 corresponds to a filler.
  • the potting material 185 corresponds to the potting resin and the curable resin.
  • a urethane resin or a silicone resin may be used as the potting material 185.
  • the potting portion 65 is likely to be softer than when the epoxy resin is used as the potting material 185.
  • the injection operation is performed so that air potions such as voids and gaps are not formed in the potting material 185 filled in the sealing area PA.
  • the inner peripheral curved surface 182 is configured such that an acute angle or a right angled corner portion does not exist.
  • a gap is less likely to be generated between the potting material 185 and the inner circumferential surface 180 of the sealing area PA, and the potting material 185 extends along the inner circumferential surface 180 of the sealing area PA. It is less likely that the phenomenon of crawling up toward will occur.
  • the potting material 185 is filled in the sealing area PA such that the sensor SA 50, the connection portion 183, and the connector terminal 28a are covered from the housing opening 61 side.
  • the potting material 185 is positioned so that the center of the surface of the potting material 185 is slightly inward from the housing opening 61 so that the potting material 185 does not overflow from the housing opening 61 even if a creeping phenomenon occurs. Set the injection volume.
  • connection between the lead terminal 54 and the intake air terminal 23 c is also covered with the potting material 185.
  • the connection between the lead terminal 54 and the intake air terminal 23 c includes the connection between the lead terminal 54 and the bridge terminal 86 at the intake air terminal 23 c and the entire bridge terminal 86.
  • the potting material 185 is injected, the potting material 185 is cured by heating to form the potting portion 65.
  • the hardness such as the hardness of the potting portion 65 differs depending on the component of the potting material 185 and the like. Regardless of the hardness of the potting portion 65, the occurrence of positional deviation of the sensor SA50 in the internal space 24a can be suppressed by the potting portion 65, but the harder the potting portion 65 is, the suppression effect against positional deviation of the sensor SA50 Get higher. Further, as the potting portion 65 is softer, the potting portion 65 is more easily in intimate contact with the sealing area PA, the sensor SA 50, and the connection portion 183, so the sealing performance by the potting portion 65 can be enhanced.
  • the potting portion 65 covers the sensor SA50 from the housing opening 61 side, and corresponds to a covering portion. In this case, the potting portion 65 covers the connection portion between the lead terminal 54 and the connector terminal 28 a from the housing opening 61 side. In addition, the potting material 185 corresponds to a covering material.
  • the potting portion 65 is formed by injecting the potting material 185 into the internal space 24a, pressure is applied to the internal space 24a when the internal space 24a is sealed. Being less likely to occur.
  • the pressure applied to the internal space 24 a prevents the unintended displacement of the sensor SA 50, it is less likely that the position of the sensor SA 50 varies among products. Therefore, it can be suppressed that the detection accuracy of the flow rate detection unit 22 varies from product to product.
  • the housing opening 61 is formed by the lip 89 projecting from the housing main body 24. Therefore, even if the shape or size of the housing main body 24 is not changed, the depth dimension of the internal space 24a or the sealing area PA in the height direction Y is changed simply by changing the projecting dimension of the lip 89. be able to.
  • the depth dimensions of the internal space 24 a and the sealing area PA can be appropriately set according to the length dimension of the sensor SA 50 in the height direction Y without reducing the versatility of the housing main body 24. Therefore, it is possible to avoid that the sensor SA50 is too long with respect to the internal space 24a and the sensor SA50 is partially protruded from the potting material 185 even though the internal space 24a is sealed by the potting material 185. .
  • the inner circumferential curved surface 182 is included in the inner circumferential surface 180 of the sealing area PA. Therefore, it is possible to suppress the formation of a gap between the potting material 185 and the inner circumferential surface 180, and the possibility that the potting material 185 creeps up along the inner circumferential surface 180 and overflows from the housing opening 61. Therefore, the sealing performance of the internal space 24 a by the potting material 185 can be properly exhibited.
  • the housing opening 61 is disposed on the opposite side of the ring holding portion 25 from the inflow port 33 a. Therefore, a configuration can be realized in which the housing opening 61 is disposed outside the intake pipe 12 a instead of the intake passage 12.
  • the potting portion 65 is not always exposed to the intake air flowing through the intake passage 12, damage or deterioration of the potting portion 65 can be suppressed. Thereby, the sealing performance of the internal space 24 a by the potting portion 65 can be exhibited over a long period of time.
  • the connecting portion 183 between the lead terminal 54 and the connector terminal 28 a is covered by the potting portion 65 in addition to the sensor SA 50. Therefore, the sealing performance of the potting portion 65 can protect not only the sensor SA 50 but also the connecting portion 183.
  • one end surface is referred to as a housing front end surface 191, and the other end surface is referred to as a housing base end surface 192.
  • the housing opening 61 is provided in the housing base end surface 192.
  • the housing base end surface 192 is formed by the outer peripheral surfaces of the housing main body 24, the flange portion 27, and the connector portion 28, and the housing opening 61 is disposed on the outer peripheral surface of the housing main body 24.
  • the housing base end face 192 is provided with a plurality of light theft portions 41 and screw holes 42 in addition to the housing opening 61, and these light theft portions 41 and screw holes 42 are arranged on the outer peripheral surface of the flange portion 27. It is done.
  • the housing base end surface 192 corresponds to a housing surface which is one surface of the housing. Further, the housing front end surface 191 and the housing base end surface 192 are aligned in the height direction Y.
  • the housing opening 61 is an open end of the internal space 24 a, and as described above, the internal space 24 a is sealed from the housing opening 61 by the potting portion 65.
  • the potting surface 193 which is the outer surface, faces the opposite side to the sensor SA50 in the height direction Y, similarly to the housing proximal surface 192.
  • the potting material 185 filled in the internal space 24 a creeps up on the inner peripheral surface 180 of the sealing area PA, so that the peripheral portion of the potting surface 193 is easily curved.
  • the potting surface 193 as a whole is almost flat except for the peripheral portion.
  • the potting portion 65 corresponds to the sealing portion
  • the potting surface 193 corresponds to the outer surface of the sealing portion.
  • the housing opening 61 is disposed on the opposite side of the sensor SA 50 to the inlet 33a.
  • the inlet 33a is disposed in the intake passage 12 inside the intake pipe 12a, while the potting portion 65 is disposed outside the intake pipe 12a.
  • the potting surface 193 faces the opposite side to the intake pipe 12a in the height direction Y.
  • the housing opening 61 is formed in a rectangular shape as a whole as described above.
  • the housing opening 61 has a pair of first side portions 195 which are long sides and a pair of second side portions 196 which are short sides, and has a flat shape extending in the depth direction Z as a whole. It has become.
  • the first side 195 extends in the depth direction Z
  • the second side 196 extends in the width direction X.
  • the housing opening 61 is chamfered at four corners, and the chamfered portion is curved toward the outer peripheral side in a state in which the first side 195 and the second side 196 are connected.
  • the first side portion 195 corresponds to the opposite side.
  • the chamfered portion may extend straight instead of being curved or may be bent. The chamfered portions may not be disposed at all four corners of the housing opening 61.
  • the potting surface 193 is provided with an information unit 194 indicating predetermined information set in advance.
  • the information unit 194 has numbers, characters, marks, and the like.
  • the marks include symbols, logos, storage marks, and the like, and the storage marks include a two-dimensional code, and the like.
  • Various kinds of information are stored in the memory mark, and correction information used for the correction when the detection signal of the flow rate detection unit 22 or the intake air temperature sensor 23 is corrected by the circuit chip 81 or the ECU 20 is stored in the various information. It is included.
  • the various information includes a characteristic map indicating characteristics of the flow rate detection unit 22, the intake air temperature sensor 23, the air cleaner 19, and the like.
  • the information unit 194 is formed of ink, paint, and unevenness applied to the potting surface 193. Examples of a method for applying the information portion 194 to the potting surface 193 include laser marking and ink marking.
  • the information unit 194 includes a number sequence or a character string formed of a plurality of numbers or characters to indicate various information, and the number sequence or the character string is arranged along the first side portion 195. In this case, since the user or the like may read the information displayed by the information unit 194 along the first side 195, it is less likely that the content of the information unit 194 will be read erroneously.
  • the information unit 194 is disposed in a wide area of the potting surface 193 but is basically disposed in the flat portion of the potting surface 193.
  • the potting portion 65 is formed by injecting the potting material 185 into the internal space 24a, and therefore, it is possible to flatten most of the potting surface 193. Moreover, since the housing opening 61 and the internal space 24 a are large enough to allow the sensor SA 50 to be inserted, the potting surface 193 is less likely to be insufficient for displaying the information part 194. . Thus, since the flattening and enlargement of the potting surface 193 are achieved, the visibility of the information portion 194 provided to the potting surface 193 can be enhanced.
  • the SA main body 170 of the sensor SA 50 and the connector terminal 28 a are arranged horizontally in the width direction X.
  • the width dimension of the internal space 24 a and the width dimension of the housing opening 61 in the width direction X are increased to such an extent that the SA main body 170 and the connector terminal 28 a can be arranged side by side. That is, the width dimension of the potting surface 193 in the width direction X is large. In this case, by making it possible to increase the size of the information unit 194 on the potting surface 193, the visibility of the information unit 194 can be enhanced.
  • the potting surface 193 is disposed outside the intake pipe 12a. become.
  • the worker can visually recognize the potting surface 193 and the information portion 194 while the air flow meter 14 is attached to the intake pipe 12a. Therefore, when visually recognizing the information part 194, the effort of removing the air flow meter 14 from the intake pipe 12a can be omitted.
  • the housing opening 61 is flat as a whole such that the pair of first sides 195 is a long side, so that the arranging direction of the information portions 194 can be clarified.
  • the number strings and character strings of the information unit 194 are arranged along the first side 195, so that the operator can be prevented from misreading the number strings and character strings.
  • the visibility of the information unit 194 can be enhanced by the shape of the potting surface 193.
  • the housing base end face 192 is provided with a meat theft portion 41.
  • the housing base end face 192 is provided with a meat theft portion 41.
  • the housing base end face 192 is insufficient, the housing 21 becomes thick, which may cause unintended deformation of the housing 21 along with curing of the molten resin when the housing 21 is resin-molded. Be done.
  • the information section 194 is added to the potting surface 193, it is not necessary to secure a flat surface suitable for display on the information section 194 in the housing base end surface 192.
  • the sufficient thickness theft portion 41 on the housing base end surface 192, the deformation of the housing 21 caused by the resin molding can be suppressed, and the visibility of the information portion 194 on the potting surface 193 can be enhanced.
  • the senor SA 50 is covered by the potting portion 65.
  • the lid member in a configuration in which a lid member resin-molded as a separate member from the housing 21 is attached to the housing opening 61, the lid member also becomes larger as the housing opening 61 becomes larger. It will be enlarged.
  • the lid member is enlarged, it is necessary to make the lid member thick so that the lid member can hold its own shape, but the thickness of the lid member is to prevent deformation due to resin molding. It is believed that the need to form a punch also arises. For this reason, in the lid member, it becomes difficult to secure a flat surface to the extent that the information portion 194 can be provided.
  • the information portion 194 can be disposed almost all over the potting surface 193 by utilizing the phenomenon that the potting surface 193 is necessarily flattened. become. Therefore, the visibility of the information unit 194 on the potting surface 193 can be enhanced.
  • ⁇ Configuration group H> A configuration group H related to correcting the detection result of the physical quantity detection unit will be described with reference to FIGS. 44 to 57 and the like.
  • the air flow meter 14 has an inflow portion 501 which has entered the inside of the intake pipe 12a, and an overhang portion 502 which has protruded to the outside of the intake pipe 12a by not entering the inside of the intake pipe 12a.
  • the entry portion 501 includes the bypass flow passage 30 and the ring holding portion 25, and the protruding portion 502 includes the housing opening 61, the flange portion 27, and the connector portion 28.
  • the air flow meter 14 is divided into two by aligning in the height direction Y with the intruding portion 501 and the protruding portion 502, and the boundary portion between these portions 501 and 502 coincides with the open end of the pipe flange 12c. .
  • the housing main body 24 and the sensor SA 50 straddle the boundary between the intruding portion 501 and the protruding portion 502 in the height direction Y.
  • the projecting portion 502 includes the housing proximal end surface 192
  • the intruding portion 501 includes the housing distal end surface 191.
  • the housing base end surface 192 may be referred to as an end on the side of the protruding portion 502
  • the housing tip end surface 191 may be referred to as an end on the entering portion 501 side.
  • the intruding portion 501 and the protruding portion 502 are aligned in the height direction Y, and the height direction Y corresponds to the direction in which the intruding portion 501 and the protruding portion 502 are aligned.
  • the air flow meter 14 includes temperature detection units 505 and 506 that detect the temperature of intake air flowing through the intake passage 12.
  • the temperature detection units 505 and 506 are sensors including elements such as a temperature detection element mounted on a circuit board, and detect the internal temperature of the intake pipe 12a.
  • the first temperature detection unit 505 is provided in the measurement flow channel 32, and detects the temperature of the intake air in the measurement flow channel 32.
  • the first temperature detection unit 505 detects the temperature of the intake air flowing through the measurement passage 32 to detect the temperature of the intake air flowing through the intake passage 12.
  • the first temperature detection unit 505 is disposed in the sensing unit 53 of the sensor SA 50, and more specifically, is mounted on the detection substrate 22a together with the detection element 22b.
  • the detection board 22a corresponds to a circuit board on which the element of the first temperature detection unit 505 is mounted.
  • the second temperature detection unit 506 is disposed at a position closer to the housing opening 61 than the first temperature detection unit 505 in the height direction Y, and detects the internal temperature of the air flow meter 14.
  • the second temperature detection unit 506 detects the internal temperature of the air flow meter 14 to detect the internal temperature of the intake pipe 12a even if the second temperature detection unit 506 is disposed at a position not touching the intake air.
  • the second temperature detection unit 506 is disposed between the housing base end surface 192 and the first temperature detection unit 505 in the height direction Y by being disposed at a position closer to the housing opening 61 than the measurement flow channel 32. It is done.
  • the second temperature detection unit 506 is disposed in the circuit housing unit 51 of the sensor SA 50, and more specifically, is mounted on the lead frame 82 together with the circuit chip 81.
  • the lead frame 82 corresponds to a circuit board on which the element of the second temperature detection unit 506 is mounted.
  • the first temperature detection unit 505 is disposed in the sealed area PA (see FIG. 8 etc.), and the second temperature detection unit 506 is disposed in the open area PB (see FIG. 8 etc.) ing.
  • the internal combustion engine 11 or the like that generates heat outside the intake pipe 12a is referred to as an external heat source
  • heat is applied to the air flow meter 14 from this external heat source.
  • the air flow meter 14 it is considered that the heat from the external heat source is first applied to the protruding portion 502, and the heat is transmitted from the protruding portion 502 to the entering portion 501.
  • the temperature detection units 505 and 506 detect the detected value that is the detection result of the temperature detection units 505 and 506 and the intake due to the addition of the heat from the external heat source in addition to the heat from the intake air. An error is likely to occur between the actual temperature of the intake air flowing through the passage 12 and the temperature.
  • the actual temperature of the intake air flowing through the intake passage 12 is also referred to as the actual temperature of the intake air. Note that this actual temperature can also be referred to as a steady state value.
  • the first temperature detection unit 505 is disposed at a position farther from the protruding portion 502 than the second temperature detection unit 506. Further, while the second temperature detection unit 506 is disposed at a position where it is difficult to touch the intake air, the first temperature detection unit 505 is disposed at a position where the measurement flow path 32 easily touches the intake air. . Due to these things, the detection value of the first temperature detection unit 505 is less susceptible to the influence of an external heat source than the detection value of the second temperature detection unit 506, and is closer to the actual temperature of the intake air. Prone. In other words, the error of the first temperature detection unit 505 with respect to the actual temperature of the intake air tends to be smaller than the error of the second temperature detection unit 506 with respect to the actual temperature of the intake air.
  • the circuit chip 81 performs processing for acquiring a temperature correction value obtained by correcting the detection value of the first temperature detection unit 505 as a temperature measurement value.
  • the circuit chip 81 corresponds to a measurement control device that controls the air flow meter 14 such as acquiring a temperature correction value as a measurement value.
  • the circuit chip 81 is an arithmetic processing circuit configured by a microcomputer including a processor, a RAM, a ROM, a storage medium such as a ROM and a flash memory, an input / output unit, a power supply circuit and the like.
  • the circuit chip 81 is electrically connected to the flow rate detection unit 22, the intake air temperature sensor 23, and the temperature detection units 505 and 506, and detection signals of the detection units 22, 505 and 506 and the sensor 23 are input.
  • the circuit chip 81 measures the flow rate and temperature of the intake air flowing in the measurement flow path 32 using detection signals of the detection units 22, 505, 506 and the sensor 23.
  • the plurality of connector terminals 28a of the air flow meter 14 include a signal terminal 521, a power supply terminal 522, a ground terminal 523 and an adjustment terminal 524.
  • the terminals 521 to 524 are all electrically connected to the circuit chip 81, and the circuit chip 81 outputs measurement values of temperature and flow rate from the signal terminal 521 to the ECU 20 and the like.
  • the circuit chip 81 stores information related to the temperature correction value in the storage medium in association with time information such as correction timing.
  • An adjustment device as an external device capable of adjusting the correction accuracy of the circuit chip 81 can be connected to the adjustment terminal 524. In the state where the adjusting device is electrically connected to the adjusting terminal 524, it is possible to rewrite the information on the temperature correction value stored in the storage medium.
  • the circuit chip 81 includes a temperature correction unit 510 that acquires a temperature correction value by correcting the detection value of the first temperature detection unit 505.
  • the temperature correction unit 510 has a plurality of functions including a first correction unit 511, a temperature difference unit 512, a second correction unit 513, a characteristic conversion unit 514, a correction amount calculation unit 515, and a correction value calculation unit 516. I have a block.
  • the detection results of the flow rate detection unit 22 and the temperature detection units 505 and 506 are input to the first correction unit 511, the temperature difference unit 512, and the characteristic conversion unit 514. Further, in the temperature correction unit 510, the detection value of the flow rate and the detection value of the temperature are acquired based on the detection signals of the flow rate detection unit 22 and the temperature detection units 505 and 506.
  • the first temperature signal Sa1 including the detection value of the first temperature detection unit 505, the second temperature signal Sa2 including the detection value of the second temperature detection unit 506, and the detection value of the flow rate detection unit 22.
  • the first temperature signal Sa1 is corrected using the flow rate signal Sa3.
  • the temperature correction unit 510 the first temperature signal Sa1 is input to the first correction unit 511 and the temperature difference unit 512, the second temperature signal Sa2 is input to the temperature difference unit 512, and the flow rate signal Sa3 is input to the characteristic conversion unit 514. It is input.
  • the first temperature detection unit 505 corresponds to a physical quantity detection unit that detects a physical quantity called temperature
  • the first temperature signal Sa1 corresponds to the detection result of the physical quantity detection unit.
  • the second temperature detection unit 506 corresponds to a homogeneous detection unit that detects a temperature that is the same type of physical quantity as the first temperature detection unit 505, and the second temperature signal Sa2 corresponds to the detection result of the homogeneous detection unit.
  • the flow rate detection unit 22 corresponds to a heterogeneous detection unit that detects a flow rate that is a physical quantity of a type different from that of the first temperature detection unit 505, and the flow rate signal Sa3 corresponds to the detection result of the heterogeneous detection unit.
  • the second temperature signal Sa2 and the flow rate signal Sa3 correspond to correction parameters used for correcting the first temperature signal Sa1.
  • the first correction unit 511 calculates the first correction signal Sb1 by performing the response correction of the first temperature signal Sa1.
  • the temperature difference unit 512 calculates a difference that is the difference between the first temperature signal Sa1 and the second temperature signal Sa2 as a temperature difference signal Sb2.
  • the second correction unit 513 calculates a difference correction signal Sb3 by performing response correction on the temperature difference signal Sb2.
  • the characteristic conversion unit 514 calculates the flow rate conversion signal Sb4 by performing characteristic conversion of the flow rate signal Sa3.
  • the correction amount calculation unit 515 calculates the correction amount signal Sb5 using the difference correction signal Sb3 and the flow rate conversion signal Sb4.
  • the correction value calculation unit 516 calculates the correction value signal Sc using the first correction signal Sb1 and the correction amount signal Sb5.
  • the first correction unit 511 corrects the first temperature signal Sa1 based on the change mode of the first temperature signal Sa1, and acquires the correction value as a first correction signal Sb1.
  • the first correction unit 511 corresponds to a change correction unit.
  • the first correction signal Sb1 is obtained by performing first-order delay correction on the first temperature signal Sa1 as shown in FIG. For example, for the first temperature signal Sa1, the detected value Sa1 (tn) at the timing tn, the gradient m in the past, and the time constant A are acquired, and the product of the gradient m and the time constant A is detected value Sa1 (tn Correction value Sb1 (tn) at timing tn is calculated.
  • the first correction signal Sb1 is obtained by calculating the correction value Sb1 (tn) in each case using the following (Expression 1).
  • the time constant A is set in accordance with the flow rate of intake air in the intake passage 12. For example, as shown in FIG. 48, the time constant A is set to a larger value as the flow rate signal Sa3 is smaller.
  • information indicating the relationship between the flow rate signal Sa3 and the time constant A is stored as flow information such as maps, data, and mathematical expressions.
  • the first correction unit 511 reads this inflow information from a storage medium or the like, and uses this inflow information or the like to calculate a time constant A according to the flow rate signal Sa3. In this case, the first correction unit 511 corrects the first temperature signal Sa1 using a flow rate that is a physical quantity of a type different from the temperature, and corresponds to a different type correction unit.
  • the first temperature signal Sa1 converges to a convergence value corresponding to the actual temperature of the intake air and is stabilized at the convergence value even if the correction based on the change mode is not performed.
  • the first temperature signal Sa1 tends to converge on the convergence value, and the response is improved. high. Therefore, as shown in FIG. 49, when the flow rate of intake air in the intake passage 12 is relatively large, the first correction signal Sb1 tends to converge to the convergence value even if the correction amount is relatively small.
  • the time constant A corresponds to the flow rate correction amount.
  • Responsiveness of the first correction signal Sb1 is enhanced by performing response compensation of the first temperature signal Sa1 using the change mode as the time change information included in the first temperature signal Sa1.
  • the first temperature signal Sa1 has the first convergence value Ev1. Is shorter than the time Tb required to reach. For example, if the first temperature signal Sa1 and the first correction signal Sb1 start to change at timing t0 with the change of the actual temperature of the intake air, the first temperature signal Sa1 becomes the first convergence value Ev1 at timing t2. To reach.
  • the first correction signal Sb1 reaches the first convergence value Ev1 at a timing t1 earlier than the timing t2.
  • the response of the first correction signal Sb1 is higher than that of the first temperature signal Sa1.
  • the error with the first convergence value Ev1 is smaller in the first correction signal Sb1 than in the first temperature signal Sa1
  • the accuracy of the first correction signal Sb1 is high. This is because the first correction unit 511 sets the time constant A to a larger value as the flow rate signal Sa3 decreases as the actual temperature changes.
  • the first temperature signal when the actual temperature of the intake air changes Responsivity of Sa1 also tends to decrease. This is because it is considered that the heat from the external heat source is transmitted from the housing 21 to the first temperature detection unit 505 via the mold portion 76 of the sensor SA 50 and the intake air in the measurement flow path 32.
  • the response of the first temperature signal Sa1 is reduced due to the heat from the external heat source, the response of the first correction signal Sb1 is improved by the first correction unit 511.
  • the correction value signal Sc is output from the circuit chip 81 to the ECU 20 as information on the temperature of the intake air, and is used for controlling the combustion system 10 by the ECU 20. For this reason, when the responsiveness of the correction value signal Sc is enhanced, it is possible to realize improvement in fuel consumption and emission and to suppress misdiagnosis of a failure diagnosis apparatus such as OBD (On-board diagnostics).
  • OBD On-board diagnostics
  • the temperature difference unit 512 calculates a temperature difference signal Sb2 based on one of the first temperature signal Sa1 and the second temperature signal Sa2.
  • the temperature difference unit 512 of the present embodiment is based on the first temperature signal Sa1, and as shown in FIG. 51, a value obtained by subtracting the first temperature signal Sa1 from the second temperature signal Sa2 is used as the temperature difference signal Sb2.
  • the second convergence value Ev2 which is the convergence value for the second temperature signal Sa2 is larger than the first convergence value Ev1.
  • the heat applied from the external heat source to the first temperature detection unit 505 is the first temperature from the intake air flowing through the measurement flow path 32 There is a case where the heat is larger than the heat given to the detection unit 505.
  • the temperature difference signal Sb2 When the responsiveness of the second temperature signal Sa2 is higher than that of the first temperature signal Sa1, as shown in FIG. 52, the temperature difference signal Sb2 gradually increases, and the first convergence value Ev1 and the second convergence value The near difference ⁇ Ev, which is the difference from Ev2, is eventually reached.
  • the first temperature signal Sa1 due to the error between the first temperature signal Sa1 and the first convergence value Ev1 being larger than the error between the second temperature signal Sa2 and the second convergence value Ev2, the first temperature signal Sa1
  • the temperature difference signal Sb2 as a reference gradually increases toward the proximity difference ⁇ Ev.
  • the second correction unit 513 corrects the temperature difference signal Sb2 based on the change mode of the temperature difference signal Sb2, and acquires the correction value as a difference correction signal Sb3.
  • the second correction unit 513 performs first-order lag correction on the temperature difference signal Sb2 using, for example, the current value and the past value, as in the first correction unit 511.
  • the response of the difference correction signal Sb3 is higher than the response of the temperature difference signal Sb2.
  • the time required for the difference correction signal Sb3 to reach the proximity difference ⁇ Ev is shorter than the time required for the temperature difference signal Sb2 to reach the proximity difference ⁇ Ev. This is because, as shown in FIG. 53, the second correction unit 513 sets the difference correction amount such as the correction amount signal Sb5 to a larger value as the temperature difference signal Sb2 becomes larger at the transition time of the actual temperature. is there.
  • the second correction unit 513 reads the warm-up information from the storage medium or the like, and uses the warm-up information or the like to calculate a difference correction signal Sb3 according to the temperature difference signal Sb2.
  • the second correction unit 513 corresponds to the difference correction unit
  • the difference correction signal Sb3 corresponds to the difference correction amount.
  • the temperature correction unit 510 calculates the difference correction signal Sb3 by performing the response correction of the difference after calculating the difference between the first temperature signal Sa1 and the second temperature signal Sa2.
  • a configuration may be considered in which the difference between the first correction signal Sb1 and the second temperature signal instead of the first temperature signal Sa1 is calculated as the difference correction signal Sx.
  • the difference correction signal Sx reaches the proximity difference .DELTA.Ev by gradually decreasing after becoming greater than the proximity difference .DELTA.Ev. That is, in the difference correction signal Sx, an overshoot occurs at the initial stage of the response.
  • the correction value signal when the difference correction signal Sx includes an overshoot, the correction value signal also includes an overshoot. Assuming that the correction value signal is used by the ECU 20 to control the combustion system 10, there is a concern that the fuel efficiency and the emission may be reduced, and the diagnostic accuracy of the failure diagnosis apparatus may be reduced.
  • the time information of the difference correction signal Sb3 acquired by the second correction unit 513 matches the time information of the first correction signal Sb1 acquired by the first correction unit 511.
  • the first correction unit 511, the temperature difference unit 512, and the second correction unit 513 cause some response delay by performing various processes on the first temperature signal Sa1, the second temperature signal Sa2, and the temperature difference signal Sb2.
  • the response delay time generated in the first correction unit 511 and the total time of the response delay times generated in the temperature difference unit 512 and the second correction unit 513 are the same.
  • the first correction signal Sb1 and the difference correction signal Sb3 included in the correction value signal Sc have the same time information.
  • time information different between the first correction signal Sb1 and the difference correction signal Sb3 is The measurement accuracy of the correction value signal Sc is improved as compared with the configuration.
  • the time information of the first correction signal Sb1 and that of the difference correction signal Sb3 do not have to match each other. Even in this case, the measurement accuracy of the correction value signal Sc is maintained in the appropriate range if the shift amount of these time information is a slight shift amount or the like so as to be included in the appropriate range. Ru.
  • the characteristic conversion unit 514 causes the response correction in the first correction unit 511 to reflect the content of the flow rate signal Sa3, and causes the response correction in the second correction unit 513 to reflect the content of the flow rate signal Sa3. Characteristic conversion of the flow rate signal Sa3 is performed to calculate a flow rate conversion signal Sb4.
  • the characteristic conversion unit 514 is connected to each of the first correction unit 511 and the second correction unit 513, and outputs the flow rate conversion signal Sb4 to the correction units 511 and 513. For example, in the flow rate conversion signal Sb4, the flow rate signal Sa3 is converted into an aspect that is easy to apply to the first temperature signal Sa1 and the flow information as shown in FIG.
  • the correction amount calculator 515 acquires a multiplication signal obtained by multiplying the difference correction signal Sb3 and the flow rate conversion signal Sb4 as a correction amount signal Sb5. In this case, the correction amount calculation unit 515 calculates, as the correction amount signal Sb5, a value obtained by increasing or decreasing the difference correction signal Sb3 in accordance with the flow rate of the intake air in the measurement flow path 32.
  • the correction value calculation unit 516 acquires, as a correction value signal Sc, an integrated signal obtained by integrating the first correction signal Sb1 and the correction amount signal Sb5. In this case, the correction value calculation unit 516 outputs the first correction signal Sb1 according to both the temperature difference between the first temperature detection unit 505 and the second temperature detection unit 506 and the flow rate of the intake air in the measurement channel 32. The increased or decreased value is calculated as the correction value signal Sc.
  • the correction value signal Sc can also be referred to as a temperature correction value or a temperature measurement value.
  • the correction convergence value Ev3 which is a convergence value for the correction value signal Sc is closer to the actual temperature Sd of the intake air than the first convergence value Ev1 for the first temperature signal Sa1. It is a value.
  • the error between the correction value signal Sc and the actual temperature Sd is the difference between the corrected convergence value Ev3 and the actual temperature Sd, which is smaller than the difference between the first convergence value Ev1 and the actual temperature Sd.
  • the time required for the correction value signal Sc to reach the correction convergence value Ev3 is the same as the time Tb required for the first correction signal Sb1 to reach the first convergence value Ev1. Therefore, both the measurement accuracy and the response of the correction value signal Sc are higher than those of the first temperature signal Sa1.
  • the circuit chip 81 has a function of executing processing of each functional block in the temperature correction unit 510.
  • the function of executing the processing of the temperature correction unit 510 corresponds to the physical quantity correction unit
  • the function of executing the processing of the first correction unit 511 corresponds to the change correction unit and the dissimilar correction unit
  • the function of the second correction unit 513 The function to execute the process corresponds to the difference correction unit.
  • the circuit chip 81 has a flow rate correction unit as a function of enhancing the measurement accuracy of the flow rate correction value by correcting the flow rate signal Sa3 of the flow rate detection unit 22.
  • the flow rate correction unit is electrically connected to the intake air temperature sensor 23, and acquires a detection signal of the intake air temperature sensor 23.
  • the flow rate correction unit uses a detection signal of the intake air temperature sensor 23 as a correction parameter to correct the flow rate signal Sa3.
  • the degree of heat application from the external heat source tends to be smaller than that of the flow rate detection unit 22.
  • the intake air temperature sensor 23 is exposed to the intake passage 12 so that heat is easily applied from the intake air flowing through the intake passage 12 to the intake air temperature sensor 23, while the heat applied to the housing 21 from an external heat source Is difficult to be transmitted to the intake air temperature sensor 23. Therefore, the correction accuracy of the flow rate signal Sa3 can be enhanced by using the detection signal of the intake air temperature sensor 23, which is less affected by the heat from the external heat source, as the correction parameter.
  • the second temperature detection unit 506 is disposed between the housing base end surface 192 and the first temperature detection unit 505 in the height direction Y.
  • the degree of application of heat from the external heat source is likely to be different between the first temperature detection unit 505 and the second temperature detection unit 506.
  • the correction of the temperature signal Sa1 can be performed by the second temperature signal Sa2. Therefore, the measurement accuracy of the correction value signal Sc, which is a temperature measurement value, can be enhanced.
  • the first temperature detection unit 505 and the second temperature detection unit 506 are both disposed in the entry portion 501 of the air flow meter 14. Therefore, the heat applied from the external heat source to the temperature detection units 505 and 506 does not become too large compared to the heat applied from the intake air flowing through the intake passage 12. That is, the difference between the first temperature signal Sa1 and the second temperature signal Sa2 and the actual temperature Sd of the intake air does not become too large.
  • the first temperature signal Sa1 tends to be an appropriate value as a detection value
  • the second temperature signal Sa2 tends to be an appropriate value as a correction value, so that the measurement accuracy of the correction value signal Sc can be enhanced.
  • the first temperature detection unit 505 and the second temperature detection unit 506 are both included in the sensor SA50.
  • the detection substrate 22a in the sensor SA 50, the lead frame 82, and the like can be used as circuit boards for installing the temperature detection units 505 and 506, and the dedicated substrate does not need to be installed in the housing 21. For this reason, compared with the configuration in which at least one of the temperature detection units 505 and 506 is not mounted on the sensor SA 50, the design burden and the cost burden can be reduced.
  • the air flow meter 14 includes the flow rate detection unit 22 in addition to the temperature detection units 505 and 506. For this reason, it is possible to correct the first temperature signal Sa1 using the correction parameter of the flow rate which is a physical quantity different from air. For example, using the phenomenon that the ease of convergence of the first temperature signal Sa1 to the first convergence value Ev1 is likely to change according to the flow rate signal Sa3 indicating the amount of intake air flowing through the intake passage 12, the first The flow rate signal Sa3 can be used to correct the temperature signal Sa1. The measurement accuracy of the correction value signal Sc can be enhanced by the flow rate signal Sa3.
  • both the first temperature detection unit 505 and the flow rate detection unit 22 are provided in the measurement flow channel 32.
  • the circuit board and the circuit board on which the flow rate detection unit 22 is mounted can be shared when the first temperature detection unit 505 is mounted, the cost burden on the sensor SA 50 can be reduced.
  • both the first temperature signal Sa1 and the flow rate signal Sa3 detect the intake air flowing through the measurement flow path 32, the detection target of the first temperature signal Sa1 and the detection target of the flow rate signal Sa3 are It is easy to become common intake air. Therefore, in the configuration in which the first temperature signal Sa1 to be corrected is corrected by the flow rate signal Sa3 which is the correction parameter, the correction accuracy can be enhanced.
  • the correction accuracy of the correction value signal Sc can be enhanced.
  • the temperature difference signal Sb2 is used as the correction parameter, the correction accuracy of the correction value signal Sc can be enhanced by utilizing the relative change mode of the second temperature signal Sa2 with respect to the first temperature signal Sa1.
  • the temperature difference signal Sb2 is corrected such that the difference correction signal Sb3 increases as the temperature difference signal Sb2 increases. Therefore, the error of the correction value signal Sc with respect to the actual temperature Sd of the intake air can be made smaller than the error of the first temperature signal Sa1 with respect to the actual temperature Sd. That is, the measurement accuracy of the correction value signal Sc can be enhanced.
  • the flow rate signal Sa3 is used for the correction of the first temperature signal Sa1 together with the second temperature signal Sa2. Therefore, while the measurement accuracy of the correction value signal Sc can be enhanced by the second temperature signal Sa2, the responsiveness of the correction value signal Sc can be enhanced by the flow rate signal Sa3.
  • the temperature is detected as the same type of physical quantity by two detection units, the first temperature detection unit 505 and the second temperature detection unit 506. Therefore, the first temperature signal Sa1 can be corrected with high accuracy after appropriately grasping the application degree of heat from the external heat source by the temperature signals Sa1 and Sa2. That is, the measurement accuracy of the correction value signal Sc can be enhanced.
  • the correction of the first temperature signal Sa1 is performed based on the change mode of the first temperature signal Sa1.
  • the time required for the first correction signal Sb1 to reach the first convergence value Ev1 is the first temperature signal Sa1 is the first time.
  • the time required to reach the convergence value Ev1 can be reduced. Therefore, the responsiveness of the correction value signal Sc can be enhanced.
  • both the responsiveness and the measurement accuracy of the correction value signal Sc can be enhanced.
  • the flow rate signal Sa3 is used for the correction of the first temperature signal Sa1 together with the change mode of the first temperature signal Sa1. Therefore, the responsiveness of the correction value signal Sc enhanced by the change aspect of the first temperature signal Sa1 can be further enhanced by the flow rate signal Sa3.
  • the change mode of the first temperature signal Sa1 is used together with the second temperature signal Sa2 for the correction of the second temperature signal Sa2, thereby enhancing the responsiveness of the correction value signal Sc that is difficult to improve with the second temperature signal Sa2. Can.
  • the shape of the vertical partition wall 69 is set irrespective of the shape of the detection throttle portion 59, but in the second embodiment, the shape of the vertical partition wall 69 corresponds to the shape of the detection throttle portion 59. Is set. In the present embodiment, differences from the first embodiment will be mainly described.
  • the vertical partition wall 69 has a wall main body 69a and a wall bulging portion 69b.
  • the wall body 69a and the wall bulging portion 69b are arranged in the width direction X, and the wall bulging portion 69b is arranged on the front side of the sensor SA50 in the width direction X.
  • the wall bulging portion 69 b extends from the detection throttling portion 59 in the height direction Y toward the front end of the housing, and has the same shape as the shape of the portion on the front side of the wall main body 69 a in the detection throttling portion 59.
  • the depth dimension D9 of the wall main body 69a is smaller than the depth dimension D1 of the detection diaphragm 59, and the depth dimension D10 of the wall bulging portion 69b is the same as the depth dimension D1 of the detection diaphragm 59 or It is bigger than that.
  • the vertical partition wall 69 and the detection throttling portion 59 are an integral portion, the portion does not become thick even when approaching the housing opening 61 as a whole. Therefore, when resin molding of the housing 21, the entry 93 of the inner peripheral mold 91 entering the internal space 24 a is removed from the detection throttle 59 and the vertical partition wall 69, and the entry 93 is removed from the housing opening 61 be able to.
  • the width housing protrusion 72a of the housing main body 24 is provided at a position facing the front surface of the sensor SA50.
  • the position where the width housing protrusion 72a faces the back surface of the sensor SA50 is provided in the present embodiment.
  • the width housing projection 72a is in contact with the back SA projection 71b instead of the front SA projection 71a of the sensor SA50. Therefore, the front SA protrusion 71 a of the sensor SA 50 is in contact with the front surface of the inner peripheral surface of the housing main body 24.
  • the flow rate detection unit 22 is exposed on the left side of the sensor SA50, the left side is referred to as the front, and the right side is referred to as the back.
  • the flow rate detection unit 22 is exposed on the right side of the sensor SA50, the right side is referred to as the front, and the left side is referred to as the back.
  • the distance between the front surface and the flow rate detection unit 22 is the front surface SA It is defined by the projecting dimension of the projection 71a.
  • the separation distance between the inner circumferential surface of the detection path 32a and the flow rate detection unit 22 is defined irrespective of the width housing protrusion 72a. Therefore, even if the back SA projection 71b deforms the width housing projection 72a in accordance with the insertion of the sensor SA50 into the internal space 24a, the inner peripheral surface and the flow rate of the detection path 32a regardless of the degree of deformation of the width housing projection 72a.
  • a distance from the detection unit 22 is set. In this case, manufacturing variations are less likely to occur in the separation distance between the inner circumferential surface of the detection path 32 a and the flow rate detection unit 22, so that variation in detection accuracy by the flow rate detection unit 22 can be suppressed.
  • the depth housing projection 72b of the present embodiment is provided at a position facing the sensor SA50 at the downstream outer peripheral portion of the housing main body 24, not the upstream outer peripheral portion.
  • the depth housing projection 72 b extends toward the curved surface 45 of the housing body 24 in a direction inclined with respect to the depth direction Z.
  • the depth housing projection 72b is pressed and deformed by the end face of the relay portion 52 of the sensor SA50, whereby the sensor SA50 is pressed toward the curved surface 45 in the internal space 24a.
  • the positioning accuracy of the sensor SA50 with respect to the housing 21 is enhanced.
  • the housing opening 61 is open in the height direction Y. However, in the fourth embodiment, the housing opening 61 is open in the width direction X.
  • an air flow meter 200 is included in the combustion system in place of the air flow meter 14 as a physical quantity measurement device, and differences from the first embodiment will be mainly described.
  • an air flow meter 200 is provided in the intake passage 12.
  • the air flow meter 200 is a physical quantity measuring device similar to the air flow meter 14 of the first embodiment, and is attached to the intake pipe 12 a (see FIGS. 2 and 8).
  • the airflow meter 200 includes a housing 201, a flow rate detection unit 202, and a seal member 206.
  • the housing 201 includes a housing main body 204, a seal holding unit 205, a flange portion 207, and a connector portion 208. These members and portions correspond to the members and portions having the same names in the first embodiment.
  • housing front end surface 215 one end surface is referred to as a housing front end surface 215, the other end surface is referred to as a housing base end surface 216, and the housing front end surface 215 side in the height direction Y is referred to as a housing front end side. Is referred to as the housing proximal side.
  • the housing main body 204, the seal holding portion 205, the flange portion 207, and the connector portion 208 are arranged in this order from the housing distal end side, and the housing main body 204 extends from the seal holding portion 205 toward the housing distal end. There is.
  • the housing main body 204 and a part of the seal holding portion 205 are included in the intruding portion which has entered the inside of the intake pipe 12a, and the housing front end surface 215 is further included. Further, a part of the seal holding portion 205, the flange portion 207, and the connector portion 208 are included in the protruding portion which protrudes to the outside of the intake pipe 12a, and further, the housing base end surface 216 is included.
  • the housing base end face 216 may be referred to as an end on the protruding part side
  • the housing tip end face 215 may be referred to as an end on the entering part side.
  • the seal member 206 is provided between the seal holding portion 205 and the pipe flange 12c of the intake pipe 12a, and is in close contact with the seal holding portion 205 and the pipe flange 12c.
  • the seal member 206 is a member for restricting the leakage of the intake air to the outside from the airflow insertion hole 12b like the O-ring 26 in the first embodiment, and has a rectangular ring shape in accordance with the shape of the seal holding portion 205. It is formed. In this case, the outer peripheral end of the seal member 206 is rectangular.
  • the flange portion 207 extends from the seal holding portion 205 toward the outer peripheral side, and the state where the seal member 206 is pressed also to the flange portion 207 It has become. Therefore, even if the seal holding portion 205 itself does not have the function of holding the seal member 206, the seal holding portion 205 and the flange portion 207 can hold the seal member 206.
  • the seal member 206 in this case can also be referred to as a pressing packing.
  • the housing body 204 has a bypass flow passage 210.
  • the bypass flow channel has a passage flow channel 211, a measurement flow channel 212, an inlet 213a, an outlet 213b, and a measurement outlet 213c.
  • the flow rate detection unit 202 is included in the sensor SA220. These members and portions correspond to the members and portions having the same names in the first embodiment.
  • the sensor SA 220 includes an SA base 221, a detection support 223, and a lead terminal 224 (see FIG. 63).
  • the detection support portion 223 supports the flow rate detection portion 202, and the SA base portion 221 supports the detection support portion 223 and the lead terminal 224.
  • the SA base unit 221 corresponds to the circuit housing unit 51 and the relay unit 52 in the first embodiment, and the detection support unit 223 and the lead terminal 224 are members and portions corresponding to the sensing unit 53 and the lead terminal 54.
  • the sensor SA 220 can also be referred to as a sensor module, a sensor assembly, or a sensor unit.
  • the flow rate detection unit 202, the SA base unit 221, and the detection support unit 223 constitute an SA main body 225.
  • the sensor SA 220 includes an SA body 225 and a lead terminal 224.
  • the SA main body 225 is a portion having the flow rate detection unit 202, and the lead terminal 224 extends from the SA main body 225.
  • the detection support 223 extends from the SA base 221 toward the distal end of the housing, and the lead terminal 224 extends from the SA base 221 toward the proximal end of the housing.
  • the detection support section 223 has a size and a shape capable of arranging the flow rate detection section 202 in the measurement flow channel 212, and the lead terminal 224 electrically connects the connector terminal 208a (see FIG. 63) provided in the connector section 208. Connected.
  • the connector terminal 208a is electrically connected to the ECU 20 by inserting the plug portion into the connector portion 208 as in the connector terminal 28a of the first embodiment.
  • the housing main body 204 has an internal space 204 a accommodating the sensor SA 220 and a housing opening 241 opening the internal space 204 a.
  • the housing main body 204 has wall portions 231 to 235 which form an internal space 204a, and the wall portions 231 to 235 are all plate-shaped.
  • the upstream wall portion 231 upstream of the internal space 204 a and the downstream wall portion 232 downstream of the internal space 204 a are arranged in the depth direction Z, and the respective plate surfaces are directed in the depth direction Z They face each other across the internal space 204a.
  • the front wall portion 233 facing the front surface of the sensor SA220 and the back wall portion 234 facing the back surface of the sensor SA220 are arranged in the width direction X, and the internal space with the respective plate surfaces directed in the width direction X They face each other across 204 a.
  • the distal end wall portion 235 forms a distal end surface of the housing main body 204, and connects the wall portions 231 to 234.
  • the front end wall portion 235 is in a state of being stretched over the front wall portion 233 and the back wall portion 234 in the width direction X, and is in a state of being stretched over the upstream wall portion 231 and the downstream wall portion 232 in the depth direction Z It has become.
  • the opening direction of the housing opening 241 is different from the opening direction of the housing opening 61 of the first embodiment, and is in the width direction X.
  • the housing opening 241 is formed in the front wall 233.
  • the housing opening portion 241 is provided at a position near the seal holding portion 205 in the height direction Y, and extends from the seal holding portion 205 toward the front end of the housing.
  • the upstream wall portion 231, the downstream wall portion 232 and the back wall portion 234 extend from the seal holding portion 205 toward the front end of the housing, while the back wall portion 234 extends from the seal holding portion 205 to the housing It is arrange
  • an inlet 213a is provided in the upstream wall 231
  • an outlet 213b is provided in the downstream wall 232
  • a measurement outlet 213c is provided in each of the front wall 233 and the back wall 234.
  • the air flow meter 200 has a potting portion 242 for closing the housing opening 241.
  • the potting portion 242 covers the sensor SA 220 from the housing opening 241 side, and corresponds to a covering portion.
  • the potting portion 242 is formed by curing a thermosetting resin such as a potting resin filled in the inner space 204a, as in the potting portion 65 of the first embodiment.
  • the thermosetting resin seals the internal space 204a by being injected from the housing opening 241 into the internal space 204a in a fluid state.
  • the thermosetting resin may be made of an epoxy resin, a urethane resin, a silicon resin, or the like.
  • the sensor SA 220 is held in position in the internal space 204 a so as not to be displaced.
  • the housing main body 204 has restricting portions 251 and 255 which restrict the positional deviation of the sensor SA220.
  • the restricting portions 251 and 255 are both formed in a plate shape, and are provided at predetermined intervals in the height direction Y in a state where the respective plate surfaces are directed in the height direction Y.
  • the restricting portions 251 and 255 are provided at an intermediate position of the housing main body 204 in the height direction Y.
  • the restricting portions 251 and 255 are opposed to each other, and the sensor SA 220 is in a state in which the restricting portions 251 and 255 enter.
  • the SA base portion 221 of the sensor SA 220 is fitted between the restricting portions 251 and 255, and the movement of the sensor SA 220 in the height direction Y is restricted by the hooking of the SA base portion 221 on the restricting portions 251 and 251.
  • a first restricting portion 251 is provided on the housing distal end side of the SA base portion 221, and a second restricting portion 255 is provided on the housing base end side of the SA base portion 221.
  • the sensor SA 220 is less likely to move in the width direction X or the depth direction Z because the SA base portion 221 is sandwiched between the restricting portions 251 and 255.
  • Internal space 204a includes a flow path area QA forming bypass flow path 210 (see FIG. 61), a support area QB accommodating SA base portion 221, and a connector accommodating a connection portion between connector terminal 208a and lead terminal 224. And an area QC.
  • the support area QB is disposed between the flow path area QA and the connector area QC.
  • the flow path area QA and the support area QB are partitioned by the first restricting portion 251, and the support area QB and the connector area QC are partitioned by the second restricting portion 255.
  • the end face on the housing base end side of the seal holding portion 205 faces the second restricting portion 255 across the connector region QC, and the connector region QC is also partitioned by the seal holding portion 205.
  • the boundary between the flow passage area QA and the support area QB is disposed at the center of the first restriction portion 251, and the boundary between the support area QB and the connector area QC is at the center of the second restriction portion 255. It is arranged.
  • the potting portion 242 is not filled in the entire area of the internal space 204a, and is filled in the support area QB and the connector area QC, but not in the flow path area QA.
  • the support area QB and the connector area QC are areas opened to the outside through the housing opening 241, and the operator injects a thermosetting resin from the housing opening 241 into the support area QB and the connector area QC. Is possible.
  • the first restricting portion 251 is provided between the front wall portion 233 and the back wall portion 234 in the width direction X, and is passed to the wall portions 233 and 234. Further, the first restricting portion 251 is provided between the upstream wall portion 231 and the downstream wall portion 232 in the depth direction Z, and is passed over the wall portions 231 and 232.
  • the first restricting portion 251 is provided with a first insertion portion 252 through which the detection support portion 223 of the sensor SA 220 is inserted.
  • the first insertion portion 252 is a notch that penetrates the first restricting portion 251 in the height direction Y, and at the middle position of the first restricting portion 251 in the depth direction Z, from the front end portion of the first restricting portion 251 to the back. It extends towards the wall 234.
  • the first insertion portion 252 may be a through hole penetrating the first restricting portion 251.
  • the sensor SA 220 and the first restricting portion 251 have a thermosetting resin injected into the support area QB and the connector area QC, and the flow path area from between the sensor SA 220 and the first restricting section 251 It adheres to QA so as not to leak.
  • the end face on the housing tip end side of the SA base portion 221 abuts against the outer peripheral surface of the first restricting portion 251 so that the inner peripheral surface of the first insertion portion 252 and the outer peripheral surface of the detection support portion 223 Are in contact so that they overlap.
  • the thermosetting resin does not leak out from the gap between the detection support portion 223 and the front wall portion 233.
  • the second restricting portion 255 is provided between the upstream wall portion 231 and the downstream wall portion 232 in the depth direction Z, and is passed over the wall portions 231 and 232.
  • the second restricting portion 255 extends from the back wall portion 234 toward the housing opening 241 in the width direction X, and is not connected to the front wall portion 233.
  • the second restricting portion 255 is provided with a second insertion portion 256 into which the lead terminal 224 of the sensor SA 220 is inserted.
  • the second insertion portion 256 is a notch that penetrates the second restricting portion 255 in the height direction Y, and at the intermediate position of the second restricting portion 255 in the depth direction Z, from the front end portion of the second restricting portion 255 to the back It extends towards the wall 234.
  • the movement of the sensor SA 220 toward the proximal end of the housing is restricted by the contact of the SA base portion 221 with the second restricting portion 255.
  • the SA base portion 221 is sandwiched between the front wall portion 233 and the back wall portion 234. In this case, the front surface of the SA base portion 221 contacts the front wall portion 233, and the back surface of the SA base portion 221 contacts the back wall portion 234, whereby movement of the sensor SA220 in the width direction X is restricted. There is.
  • the back wall portion 234 is provided with a housing recess 264 for housing the back side surface of the SA base portion 221.
  • the housing recess 264 is formed by recessing the inner peripheral surface of the back wall 234 toward the outer periphery, and is disposed at an intermediate position between the upstream wall 231 and the downstream wall 232 in the depth direction Z.
  • the SA base portion 221 is fitted in the housing recess 264, and the movement of the sensor SA 220 in the depth direction Z is restricted by the inner peripheral surface of the housing recess 264.
  • the housing 201 is formed by assembling a plurality of parts.
  • the housing 201 has a base member 261 and a cover member 262.
  • the cover member 262 includes at least the front wall portion 233 of the housing main body 204, and is integrally molded as a separate member from the base member 261.
  • the base member 261 has a portion of the housing body 204 excluding the cover member 262, the seal holding portion 205, the flange portion 207, and the connector portion 208, and these portions are integrally molded.
  • the internal space of the base member 261 is different from the back wall portion 234 with the upstream wall portion 231, the downstream wall portion 232, and the tip wall portion 235 interposed therebetween because the base member 261 does not have the front wall portion 233. It is open to the other side.
  • the open portion is referred to as a base opening 263
  • the base opening 263 is closed by the cover member 262 and the potting portion 242 when the housing 201 is completed.
  • An accommodation cutout portion 265 accommodating the cover member 262 is provided in the base member 261 so that a step is not generated at the boundary between the base member 261 and the cover member 262 on the surface of the housing main body 204.
  • the housing notch portion 265 straddles the upstream wall portion 231, the downstream wall portion 232, the tip wall portion 235, and the first restricting portion 251, and cuts out the front end portion of the base member 261.
  • a portion formed by the upstream wall portion 231 and the downstream wall portion 232 on the surface of the housing main body 204 and the cover member 262 are formed.
  • the part is coplanar.
  • the flow rate detection unit 202 corresponds to a physical quantity detection unit
  • the sensor SA 220 corresponds to a detection unit.
  • illustration of the bypass flow path 210 is abbreviate
  • FIG. 63 is a partial cross-sectional view showing a cross section of the housing 201 only at a portion on the housing distal end side than the seal holding portion 205.
  • FIG. 64 is a view of the housing 201 from the open side of the base member 261 with the potting portion 242 and the cover member 262 removed.
  • the base member 261 and the cover member 262 are formed by resin-molding the housing body 204.
  • the connector terminal 208a is detachably mounted on a mold device such as a mold, and the molten resin is injected into the mold device in this state, whereby the base in a state in which the connector terminal 208a is embedded.
  • the member 261 is resin-molded.
  • the temporary attachment of the connector terminal 208a to the mold device is released and the mold device is removed from the base member 261.
  • one end of the connector terminal 208a protrudes from the seal holding portion 205 toward the front end of the housing.
  • the cover member 262 is attached to the base member 261 such that a part of the base opening 263 is closed by the cover member 262.
  • the housing 201, the housing main body 204, and the housing opening 241 are created.
  • the base member 261 and the cover member 262 are joined by adhesion or welding at a portion where the base member 261 and the cover member 262 are in contact with each other.
  • the sensor SA 220 is attached to the housing main body 204 by inserting the sensor SA 220 from the housing opening 241 into the internal space 204 a.
  • the SA base portion 221 is fitted between the first restricting portion 251 and the second restricting portion 255 while inserting the detection support portion 223 into the first insertion portion 252, and further, the SA base portion 221 is accommodated.
  • the sensor SA 220 is pushed so that the recess 264 is also fitted. Thereafter, the lead terminal 224 and the connector terminal 208a are electrically connected by welding or the like.
  • thermosetting resin in a fluid state from the housing opening 241 to the support area QB and the connector area QC. Inject into.
  • the support area QB and the connector area QC are filled with a thermosetting resin so that the connector terminal 208a, the lead terminal 224, and the sensor SA 220 are not exposed from the housing opening 241.
  • the potting portion 242 is formed by curing the thermosetting resin by heating.
  • the seal holding portion 205 is thicker than the housing main body 204.
  • the outer peripheral end of the cross section is circular, while the housing main body 204 extends from the end surface of the housing of the seal holding portion 205. Is rectangular in cross section.
  • the seal holding portion 205 is thick so as to ensure the strength necessary to support the air flow meter 200.
  • a housing attachment portion attached to the intake pipe 12a is constituted by the seal holding portion 205 and the flange portion 207.
  • the first restricting portion 251 and the second restricting portion 255 restrict the movement of the sensor SA 220, and each of the restricting portions 251 and 255 corresponds to a position holding portion.
  • the upstream wall portion 231, the downstream wall portion 232 and the back wall portion 234 connect the seal holding portion 205 and the restricting portions 251 and 255, and these wall portions 231, 232 and 234 are housing connecting portions.
  • the internal space 204a corresponds to a housing space in which the sensor SA220 is housed.
  • the plate surface 251a on the housing base end side is in contact with the SA base portion 221, and the movement of the sensor SA220 to the housing distal end side is restricted by the plate surface 251a.
  • the plate surface 255a on the housing distal end side is in contact with the SA base portion 221, and the movement of the sensor SA220 to the housing proximal end side is restricted by the plate surface 255a.
  • the plate surfaces 251a and 255a are held so that the sensor SA220 does not move in the height direction Y.
  • the plate surface 251a of the first restricting portion 251 corresponds to the third holding portion.
  • the end face 221 a on the housing distal end side is in contact with the plate surface 251 a of the first restricting portion 251
  • the end face 221 b on the housing proximal end is in contact with the plate surface 255 a of the second restricting portion 255.
  • the end faces 221a and 221b of the SA base portion 221 correspond to a unit contact portion in contact with the third holding portion.
  • the movement of the sensor SA 220 in the width direction X and the depth direction Z is restricted by the outer peripheral surface of the detection support portion 223 being in contact with the inner peripheral surface of the first insertion portion 252.
  • the inner peripheral surface of the first insertion portion 252 includes a front inner surface 252a, a back inner surface 252b, an upstream inner surface 252c, and a downstream inner surface 252d.
  • the front inner surface 252a and the back inner surface 252b are arranged in the width direction X, the front inner surface 252a is in contact with the front surface of the detection support portion 223, and the back inner surface 252b is in contact with the back surface of the detection support portion 223.
  • the front inner surface 252a and the back inner surface 252b hold the sensor SA 220 so as not to move in the width direction X, and correspond to a first holding unit.
  • the upstream inner surface 252c and the downstream inner surface 252d are arranged in the depth direction Z, the upstream inner surface 252c is disposed on the upstream wall portion 231 side of the housing main body 204, and the downstream inner surface 252d is disposed on the downstream wall portion 232 side.
  • the upstream inner surface 252 c and the downstream inner surface 252 d both hold the position of the sensor SA 220 so as not to move in the depth direction Z by being in contact with the side surface of the detection support portion 223 and corresponds to a second holding portion.
  • the width direction X corresponds to the first direction
  • the depth direction Z corresponds to the second direction.
  • the plate surface 251a of the first restricting portion 251 and the inner surfaces 252a to 252d of the first insertion portion 252 can also be referred to as positioning surfaces.
  • the housing main body 204 has the throttling portions 271 and 272 for throttling the measurement flow channel 212 by reducing the flow channel area of the measurement flow channel 212.
  • the front throttle portion 271 is a convex portion extending from the front wall portion 233 toward the back wall portion 234, and the back throttle portion 272 is a convex portion extending from the rear wall portion 234 toward the front wall portion 233.
  • the front throttling portion 271 and the back throttling portion 272 face each other with the detection support portion 223 interposed therebetween, and the flow rate detection portion 202 is disposed between the throttle portions 271 and 272. In this case, the flow rate detection unit 202 faces the front throttle unit 271.
  • the area around the flow rate detection unit 202 is narrowed by the expansion units 271 and 272, whereby the intake air reaching the flow rate detection unit 202 is rectified.
  • turbulence is less likely to occur in the flow of intake air around the flow rate detection unit 202, and it is possible to suppress a decrease in detection accuracy of the flow rate detection unit 202 due to this disturbance.
  • the flow rate detection unit 202 is a detection unit that utilizes the amount of heat released from the heat generation unit, as in the flow rate detection unit 22 of the first embodiment, and the flow rate is maintained in order to properly maintain the detection accuracy of the flow rate detection unit 202. It is preferable that the flow velocity of the intake air around the detection unit 202 be somewhat high.
  • the flow rate of the intake air is easily increased by narrowing the measurement flow passage 212 toward the flow rate detection unit 202 by the throttling units 271 and 272, so the flow rate detection The detection accuracy of the unit 202 can be optimized.
  • the front surface forming portion 233a is thicker than other portions of the front wall portion 233.
  • the back forming portion 234 a is thicker than other portions in the back wall portion 234.
  • the back wall portion 234 there is a concern that deformation due to resin molding may occur in the back forming portion 234a at the time of manufacture of the air flow meter 200 due to the thickness of the back forming portion 234a.
  • the back restricting portion 272 is separated from the first restricting portion 251 in the height direction Y toward the housing distal end. .
  • this deformation is absorbed in back wall part 234 in the portion between first regulation part 251 and back formation part 234a. Be Therefore, it is difficult for the position and the shape of the first restricting portion 251 to change with the deformation of the back surface forming portion 234a, and as a result, the positional deviation of the flow rate detecting portion 202 is suppressed.
  • the surface forming portion 233a is thicker than the back surface forming portion 234a.
  • the projection dimension D31 of the front throttle portion 271 from the front wall portion 233 is larger than the projection dimension D32 of the back throttle portion 272 from the back wall portion 234. Therefore, even if the surface forming portion 233a is made as thin as possible so as not to cause deformation due to resin molding, the detection accuracy of the flow rate detecting portion 202 can be optimized by adjusting the thickness of the surface forming portion 233a. The degree of throttling of the measurement flow channel 212 can be appropriately increased.
  • the cover member 262 having the surface forming portion 233a and the base member 261 having the first restricting portion 251 are separate members. In this case, even if deformation due to resin molding occurs in the surface forming portion 233a, this deformation does not change the position or the shape of the first restricting portion 251. Therefore, thickening of the surface forming portion 233a There is no possibility that the displacement of the flow rate detection unit 202 will occur.
  • the separation distance D33 between the surface of the detection support portion 223 and the front throttle portion 271 is smaller than the separation distance D34 between the back surface of the detection support portion 223 and the back throttle portion 272.
  • the degree of throttling is larger in the region between the detection support portion 223 and the front throttle portion 271 than in the region between the detection support portion 223 and the back throttle portion 272.
  • the back throttle unit 272 may not necessarily be provided.
  • the first restricting portion 251 and the second restricting portion 255 are separated from the seal holding portion 205 toward the front end of the housing. Therefore, the thickness of the seal holding portion 205 can be increased to improve the strength, while the thickness of the restriction portions 251 and 255 can be reduced.
  • the thickness of the restricting portions 251 and 255 is reduced, the shape of the restricting portions 251 and 255 does not easily vary from product to product. Therefore, the sensor positioned by the restricting portions 251 and 255 It also becomes less likely that the position of SA 220 will vary. Therefore, it can be suppressed that the detection accuracy of the flow rate detection unit 202 varies from product to product.
  • the front inner surface 252a and the back inner surface 252b restrict the movement of the sensor SA220 in the width direction X, and the upstream inner surface 252c and the downstream inner surface 252d are sensors in the depth direction Z. Regulate the movement of SA220.
  • deformation due to resin molding is difficult to occur also on the inner surfaces 252a to 252d, so that the position of the sensor SA220 varies in each product in the width direction X and the depth direction Z. Can be suppressed.
  • the plate surface 251a on the housing base end side restricts the movement of the sensor SA220 to the housing distal end side.
  • deformation due to resin molding is less likely to occur on the plate surface 251a as well, so that variation in the position of the sensor SA 220 in the height direction Y can be suppressed for each product.
  • the end face 221 a on the front end side of the housing is provided between the lead terminal 224 and the flow rate detection unit 202 at a position closer to the flow rate detection unit 202.
  • the sensor SA 220 is displaced so as to pivot about the contact portion with the first regulating portion 251 as a fulcrum, for example, as compared with the configuration in which the end face 221a is provided at a position near the lead terminal 224, The amount of displacement of the flow rate detection unit 202 can be reduced. For this reason, the fall of the detection accuracy of the flow rate detection part 202 can be suppressed.
  • the seal holding portion 205 and the first restricting portion 251 and the second restricting portion 255 are connected by the upstream wall portion 231, the downstream wall portion 232 and the back wall portion 234, the seal holding portion 205 Can be realized apart from the restricting portions 251 and 255.
  • the deformation is absorbed by the wall portions 231, 232, 234, whereby the restriction portion 251 is caused along with the deformation of the seal holding portion 205. It is less likely that the positions and shapes of the points 255 change. For this reason, it can suppress that the positioning accuracy of sensor SA220 by the control parts 251 and 255 falls.
  • the sensor SA 220 is inserted into the inside of the base member 261 through the base opening 263 when the air flow meter 200 is manufactured.
  • sensor SA220 by the 1st control part 251 originates in the fact that the deformation accompanying resin molding becomes difficult to occur in the 1st control part 251 of base member 261. Positioning accuracy can be enhanced.
  • the connector terminal 208a extends between the connector portion 208 and the internal space 204a.
  • the connector terminal 208a has a first terminal portion 282a disposed in the connector portion 208, a second terminal portion 282b disposed in the internal space 204a, and a connection terminal portion 282c connecting the terminal portions 282a and 282b. ing.
  • one end is included in the first terminal portion 282a, and the other end is included in the second terminal portion 282b.
  • the first terminal portion 282 a extends away from the housing body 204 inside the connector portion 208.
  • the second terminal portion 282b extends away from the connector portion 208 in the inner space 24a.
  • the second terminal portion 282 b is disposed between the housing opening 241 and the back wall 234.
  • connection terminal portion 282 c is embedded in the housing 201.
  • the connector terminal 208 a is fixed to the housing 201 by the embedded portion. Further, the connector terminal 208a does not extend into the support area QB, and the entire second terminal portion 282b is accommodated in the connector area QC.
  • the second terminal portion 282b corresponds to the protruding terminal portion.
  • the lead terminal 224 corresponds to a detection terminal
  • the SA main body 225 corresponds to a unit main body.
  • the width direction X corresponds to the direction in which the detection unit and the housing opening are arranged.
  • the SA main body 225 is disposed at a position crossing the flow path area QA and the support area QB in the height direction Y, and the lead terminal 224 forms the boundary between the support area QB and the connector area QC in the height direction Y It is arranged in the position which straddles.
  • the flow passage area QA and the support area QB constitute the main body area.
  • the lead terminal 224 and the connector terminal 208 a are connected in the connector area QC, and in this connection portion, the connector terminal 208 a does not enter between the lead terminal 224 and the housing opening 241 in the width direction X.
  • the lead terminal 224 is disposed between the connector terminal 208 a and the housing opening 61 in the width direction X.
  • the lead terminals 224 and the connector terminals 208a may be arranged side by side in the depth direction Z. In any case, in the inner space 204a, the connector terminal 208a does not enter between the sensor SA 220 and the housing opening 241 in the width direction X.
  • the sensor SA 220 is inserted into the internal space 204 a from the housing opening 241.
  • the sensor SA 220 is pushed until the SA main body 225 is caught by the back wall 234 and the first restricting portion 251.
  • the lead terminal 224 comes in contact with the connector terminal 208a before the SA main body 225 gets caught in the back wall portion 234 or the first restricting portion 251.
  • deformation of at least one of the lead terminal 224 and the connector terminal 208a enables the sensor SA 220 to be pushed deeper into the inner space 204a.
  • a step of connecting the lead terminal 224 and the connector terminal 208 a using a connector is performed.
  • the lead terminal 224 and the second terminal portion 282b are sandwiched between the pair of welding electrodes, and the lead terminal 224 and the second terminal portion 282b are directly joined.
  • a thermosetting resin is injected into the inner space 204a to form the potting portion 242.
  • the connector terminal 208 a in the internal space 204 a of the housing 201, the connector terminal 208 a does not enter between the housing opening 241 and the sensor SA 220 in the width direction X in the internal space 204 a of the housing 201. Therefore, after the connector terminal 208a is attached to the housing 201, the sensor SA 220 can be inserted into the internal space 204a from the housing opening 241. In this case, there is no need to perform the work of attaching the connector terminal 208a to the housing 201 after the sensor SA 220 is installed in the internal space 204a. For this reason, it can suppress that position shift of sensor SA220 arises by the impact accompanying attachment of connector terminal 208a to housing 201, etc.
  • the second terminal portion 282b of the connector terminal 208a is accommodated in the flow passage area QA and the support area QB in a state where it does not protrude into the connector area QC. Therefore, it is possible to realize a configuration in which the second terminal portion 282b does not enter between the housing opening 241 and the sensor SA220 in the width direction X.
  • the SA main body 225 does not enter the connector area QC so that the SA main body 225 contacts the second terminal 282b. Can avoid doing so. Therefore, it is possible to suppress that the SA main body 225 and the connector terminal 208a are damaged or deformed with the mutual contact with the attachment of the sensor SA 220 to the housing 201.
  • the lead terminal 224 of the sensor SA 220 is disposed at a position straddling the boundary between the support area QB and the connector area QC. In this case, it becomes possible to connect the lead terminal 224 directly to the connector terminal 208a. Therefore, the number of welding operations performed in the inner space 204a for electrically connecting the lead terminal 224 and the connector terminal 208a can be minimized. Therefore, it can suppress that position shift of sensor SA220 arises by welding work in interior space 204a.
  • the connector terminal 208a by temporarily attaching the connector terminal 208a to a mold apparatus used for resin molding of the base member 261, it is possible to mold the base member 261 in a state in which at least a part of the connector terminal 208a is embedded. For this reason, it can suppress that position shift of connector terminal 208a to base member 261 arises.
  • the senor SA 220 and the connector terminal 208 a are covered with the thermosetting resin injected from the housing opening 241 into the internal space 204 a. Therefore, the positional displacement of the sensor SA 220 and the deformation or breakage of the lead terminal 224 and the connector terminal 208 a can be suppressed by the potting portion 242 formed of the thermosetting resin.
  • the housing opening 241 is disposed between the seal holding portion 205 and the inflow port 213a in the height direction Y.
  • the housing mounting portion is configured to include the seal holding portion 205 and the flange portion 207
  • the housing opening portion 241 is disposed between the housing mounting portion and the inflow port 213a.
  • the lead terminal 224 of the sensor SA 220 and the connector terminal 208a are connected to each other, and the connection portion 291 is accommodated in the connector area QC.
  • a sealing area is configured by the support area QB and the connector area QC, and the potting portion 242 corresponds to the filling portion.
  • the thermosetting resin that forms the potting portion 242 by being filled in the internal space 204 a and then hardened corresponds to a filler.
  • the potting portion 242 is formed by injecting the thermosetting resin into the internal space 204a, pressure is applied to the internal space 204a when the internal space 204a is sealed. It is less likely to occur. In this case, since the pressure applied to the internal space 204a suppresses unintentional displacement of the sensor SA220, variations in the position of the sensor SA220 among products are less likely to occur. Therefore, it can be suppressed that the detection accuracy of the flow rate detection unit 202 varies from product to product.
  • connection portion 291 between the lead terminal 224 and the connector terminal 208 a is covered by the potting portion 242 in addition to the sensor SA 220. Therefore, the sealing performance of the potting portion 242 can protect not only the sensor SA 220 but also the connection portion 291.
  • the housing opening portion 241 is disposed between the seal holding portion 205 and the inflow port 213a in the height direction Y. For this reason, it is possible to realize a configuration in which the housing opening portion 241 is disposed not in the outside of the intake pipe 12a but in the intake passage 12 which is the inside. In this case, direct application of heat from the heat source such as the internal combustion engine 11 to the potting portion 242 is less likely to occur, so that the deterioration of the potting portion 242 due to heat can be suppressed. Thereby, the sealing performance of the internal space 204a by the potting part 242 can be exhibited over a long period of time.
  • the outer surface of the front wall portion 233 is referred to as the housing surface 301
  • the outer surface of the back wall portion 234 is referred to as the housing back surface.
  • the housing surface 301 is provided with a plurality of meat theft portions 302 recessed toward the back wall 234 side.
  • the meat theft portion 302 will be provided on the cover member 262 forming the housing surface 301.
  • the housing surface 301 corresponds to a housing surface which is one surface of the housing.
  • the housing opening 241 is an open end of the internal space 204 a, and as described above, the internal space 204 a is sealed from the housing opening 241 by the potting part 242.
  • the potting surface 303 which is the outer surface, faces the opposite side to the sensor SA50 in the width direction X, similarly to the housing surface 301.
  • the potting material filled in the internal space 204a creeps up the inner peripheral surface of the support area QB and the connector area QC, so that the peripheral portion of the potting surface 303 is easily curved.
  • the potting surface 303 as a whole is almost flat except for the peripheral portion.
  • the potting portion 242 corresponds to the sealing portion
  • the potting surface 303 corresponds to the outer surface of the sealing portion.
  • the housing opening 241 is disposed between the seal holding portion 205 and the inflow port 213a in the height direction Y.
  • both the inflow port 213a and the potting portion 242 are disposed in the intake passage 12 inside the intake pipe 12a.
  • the housing opening 241 is formed in a rectangular shape as a whole.
  • the housing opening 241 has a pair of first side portions 305 which are long sides and a pair of second side portions 306 which are short sides, and the flat portion extends in the height direction Y as a whole. It is in the form of In this case, the first side 305 extends in the height direction Y, and the second side 306 extends in the depth direction Z.
  • the four corners of the housing opening 241 are not chamfered, and the first side 305 and the second side 306 are directly connected.
  • the first side 305 corresponds to the opposite side.
  • the potting surface 303 is provided with an information unit 304 similar to the information unit 194 of the first embodiment.
  • information unit 304 numerical sequences and character strings are arranged along the first side 305.
  • the potting portion 242 is formed by injecting the potting material into the internal space 204a, it is possible to flatten the majority of the potting surface 303. Moreover, since the housing opening 241 and the internal space 204a are large enough to allow the sensor SA 220 to be inserted from the surface of the SA main body 225, the potting surface 303 is insufficient for displaying the information portion 304. Is less likely to occur. Thus, since the flattening and upsizing of the potting surface 303 are achieved, the visibility of the information unit 304 applied to the potting surface 303 can be enhanced.
  • the SA main body 225 of the sensor SA 220 and the connector terminal 208a are arranged horizontally in the height direction Y. Therefore, the width dimension of the internal space 204a and the width dimension of the housing opening 241 in the height direction Y are increased to such an extent that the SA main body 225 and the connector terminal 208a can be arranged side by side. That is, the width dimension of the potting surface 303 in the height direction Y is large. In this case, by making it possible to increase the size of the information unit 304 on the potting surface 303, the visibility of the information unit 304 can be improved.
  • the housing opening portion 241 is generally flat so that the pair of first side portions 305 is the long side, so that the arranging direction of the information portions 304 can be clarified.
  • the number sequences and character strings of the information unit 304 are arranged along the first side portion 305, so that the operator can be prevented from misreading the number strings and character strings.
  • the visibility of the information unit 304 can be enhanced by the shape of the potting surface 303.
  • the housing surface 301 is provided with a meat theft portion 302.
  • a meat theft portion 302. if it is attempted to secure a large flat surface on the housing surface 301 to such an extent that the visibility of the information unit 304 is not insufficient, there is a concern that the light theft portion 302 on the housing surface 301 will be insufficient.
  • the cover member 262 becomes thick, whereby unintended deformation occurs in the cover member 262 as the molten resin is cured when the cover member 262 is resin-molded. Are concerned.
  • the information section 304 is provided on the potting surface 303, it is not necessary to secure on the housing surface 301 a flat surface suitable for display on the information section 304.
  • the sufficient thickness theft portion 302 is arranged on the housing surface 301, it is possible to improve the visibility of the information portion 304 on the potting surface 303 while suppressing the deformation of the cover member 262 accompanying the resin molding. .
  • the senor SA 220 is covered by the potting portion 242.
  • the lid member in the internal space 204 a of the housing 201, the sensor SA 220 is covered by the potting portion 242.
  • the lid member in the configuration in which the lid member resin-molded as a separate member from the housing 201 is attached to the housing opening 241, the lid member also becomes larger as the housing opening 241 becomes larger. It will be enlarged.
  • the lid member is enlarged, it is necessary to form the light stealing portion 302 on the lid member as well as the cover member 262, and it is difficult to secure a flat surface to which the information portion 304 can be provided by the lid member. turn into.
  • the meat theft portion 302 it is not necessary to form the meat theft portion 302 for the potting portion 242 to which the information portion 304 is provided, due to the fact that resin molding is not performed.
  • the information portion 304 can be disposed almost all over the potting surface 303 by utilizing the phenomenon that the potting surface 303 is necessarily flattened. become. Therefore, the visibility of the information unit 304 on the potting surface 303 can be enhanced.
  • the passage 31 extends in the depth direction Z further downstream than the passage boundary 34.
  • the passage 31 in addition to the inflow passage 31a and the outflow passage 31b, the passage 31 includes a connection passage 331 that connects the inflow passage 31a and the outflow passage 31b.
  • the connection passage 331 is provided between the inflow passage 31 a and the outflow passage 31 b and extends from the flow passage boundary portion 34 toward the passage floor surface 152.
  • the outflow passage 31 b is between the flow path boundary portion 34 and the outlet 33 b in the depth direction Z.
  • the entire passage floor surface 152 is a floor throttling surface 152a.
  • the floor constricting surface 152a is in the state of being spread over the inflow port 33a and the outflow port 33b.
  • the floor constricted surface 152a corresponds to the floor inclined surface.
  • the wall constricted surface 153a is provided between the flow path boundary portion 34 and the outlet 33b in the depth direction Z, and is disposed in the entire outflow passage 31b in the depth direction Z. In this case, the wall throttling surface 153a is in a state of being bridged over the connection passage 331 and the outlet 33b.
  • the passing ceiling surface 151 has an inflow ceiling portion 332 a provided closer to the inflow port 33 a than the flow path boundary portion 34 and an outflow ceiling portion 332 b provided closer to the outflow port 33 b than the flow path boundary portion 34. ing.
  • the inflow ceiling portion 332a is in a state of being spread over the inflow port 33a and the flow path boundary portion 34, and extends in the depth direction Z in which the inflow port 33a and the outflow port 33b are aligned.
  • the outflow ceiling portion 332 b is in a state of being spread across the flow path boundary portion 34 and the outflow port 33 b, and is inclined with respect to the inflow ceiling portion 332 a by facing the inflow port 33 a side.
  • the flow path boundary portion 34 is inclined with respect to the inflow ceiling portion 332 a by facing the outlet 33 b as in the first embodiment.
  • the floor constriction surface 152a is also inclined with respect to the inflow ceiling portion 332a.
  • the inclination angle ⁇ 3 of the floor throttling surface 152a with respect to the inflow ceiling portion 332a is the same as or larger than the inclination angle ⁇ 2 of the flow path boundary portion 34 with respect to the inflow ceiling portion 332a.
  • the flow path boundary portion 34 corresponds to a branch boundary portion. Further, as in the first embodiment, the flow path boundary portion 34 is hidden behind the ceiling surface of the inflow passage 31a even if a person looks into the passage 31 from the inflow port 33a in the depth direction Z.
  • the introductory molding portion 97b of the measurement and molding portion 97 does not reach the outflow port 33b and does not abut on the outer peripheral mold portions 102 and 103. Therefore, unlike the first embodiment, the introductory molding portion 97 b does not have the outer measurement surface 161 in contact with the outer peripheral mold portions 102 and 103.
  • the inner measurement surface 162 of the measurement and molding unit 97 and the inner passage surface 159 of the passage die unit 104 are in contact with each other as in the first embodiment, and are caught on each other.
  • the measurement and molding portion 97 has a mold convex portion 334 in which the inner measurement surface 162 protrudes toward the inner passage surface 159 side, and the inner mold passage surface 104 faces the side opposite to the inner measurement surface 162 And has a recessed mold recess 335.
  • the mold convex portion 334 is disposed at an intermediate position of the inner measurement surface 162 and the mold concave portion 335 is disposed at an intermediate position of the inner passage surface 159 in both the width direction X and the depth direction Z.
  • the mold convex portion 334 is fitted into the mold concave portion 335 so that four sides of the mold convex portion 334 are surrounded by the inner circumferential surface of the mold concave portion 335. Therefore, relative movement in the width direction X or the depth direction Z of the measurement molding portion 97 and the passage mold portion 104 is restricted by the mold convex portion 334 being caught on the inner circumferential surface of the mold concave portion 335.
  • the inner measurement surface 162 of the measurement and molding unit 97 and the inner passage surface 159 of the passage mold unit 104 are in contact with each other at the flow path boundary portion 34.
  • the mold convex portion 334 is in a state of entering the passage flow path 31 beyond the flow path boundary portion 34, and the mold convex portion 334 and the mold concave portion 335 are fitted in the flow path 31. ing.
  • the pass-through portion 104 does not have a portion which goes beyond the flow path boundary portion 34 and enters the measurement flow path 32 side.
  • the measurement and molding section 97 is removed from the measurement flow channel 32 of the housing 21 before the passage mold section 104. This is because the mold convex portion 334 is in a state where the mold convex portion 334 is in the inside of the mold concave portion 335, so that the passage mold portion 104 can not be moved in the depth direction Z with respect to the measurement molding portion 97. As shown in FIG. 79, after the measurement molding section 97 is removed from the housing 21, the passage mold section 104 is removed from the inflow port 33a of the housing 21.
  • the passage mold portion 104 When the passage mold portion 104 is extracted from the inflow port 33 a, the passage mold portion 104 is moved to the inflow port 33 a side so as to be along the floor throttling surface 152 a of the passage flow path 31.
  • the inner passage surface 159 is caught on the upstream end of the inflow ceiling part 332a. It can not be removed from the inlet 33a. This is because at least a part of the inner passage surface 159 of the passage mold portion 104 is disposed on the housing proximal side of the inlet 33 a in the height direction Y.
  • the pass-through mold portion 104 becomes thicker toward the outer passage surface 158. It will For this reason, even if it is attempted to move the passing die part 104 toward the inflow port 33a side along the floor constriction surface 152a of the passing flow passage 31, the passing die part 104 can not be extracted from the inflow port 33a. In this case, in the through mold portion 104, the separation distance between the floor drawing molding surface 156 and the inner passing surface 159 is gradually increased toward the outer passing surface 158.
  • the passage mold portion 104 is the outer passage surface 158. The shape becomes fattering towards the end. For this reason, it is not possible to withdraw the passing mold portion 104 from the inflow port 33a.
  • the mold convex portion 334 is embedded in the mold concave portion 335 in the mold device 90, the relative positional deviation between the measurement and molding portion 97 and the pass mold portion 104 can be restricted. Moreover, since the four sides of the mold convex portion 334 are surrounded by the inner peripheral surface of the mold concave portion 335, the relative positional deviation between the measurement molding portion 97 and the passage mold portion 104 in both the width direction X and the depth direction Z Can be regulated. Therefore, on the inner circumferential surface of the passage 31 and the measurement passage 32, the measurement molding portion 97 and the passage die portion 104 are displaced, and a step is formed at the boundary between the mold portions 97 and 104.
  • the inclination angle ⁇ 3 of the floor stop surface 152a is the same as or larger than the inclination angle ⁇ 2 of the flow path boundary portion 34. Therefore, even if the flow path boundary portion 34 is inclined with respect to the depth direction Z so as to face the outlet 33b in order to suppress the entry of foreign matter into the measurement flow path 32, the passage mold portion 104 is A configuration that can be extracted from the inlet 33a can be realized.
  • the lead terminal 54 of the sensor SA 50 is connected to the connector terminal 28 a without via the bridge terminal 86.
  • differences from the first embodiment are mainly described with reference to FIGS. 80 and 81.
  • the lead terminal 54 connects the first lead portion 341 extending from the SA main body 170, the second lead portion 342 extending along the second terminal portion 172b of the connector terminal 28a, and the lead portions 341 and 342. And 3 lead portions 343.
  • the first lead portion 341 extends from the SA main body 170 toward the housing opening 61.
  • the second lead portion 342 is disposed closer to the connector terminal 28 a than the first lead portion 341, and extends from the third lead portion 343 toward the housing opening 61.
  • the first lead portion 341 and the second lead portion 342 extend in the height direction Y in parallel with each other.
  • the third lead portion 343 extends in the width direction X from the first lead portion 341 toward the connector terminal 28 a side.
  • the first lead portion 341 corresponds to a detection lead portion.
  • the second lead portion 342 and the third lead portion 343 constitute a connection lead portion connected to the first lead portion 341.
  • the lead terminal 54 straddles the boundary between the main body area PC1 and the connector area PC2 in the width direction X.
  • the first lead portion 341 is disposed in the body region PC1
  • the second lead portion 342 is disposed in the connector region PC2
  • the third lead portion 343 is a boundary between the body region PC1 and the connector region PC2. It is arranged in the position which straddles the section in the width direction X.
  • the lead terminal 54 corresponds to a detection terminal.
  • the second lead portion 342 is inserted between the sealing step surface 67 and the housing opening 61 in the height direction Y, and at least one of the second lead portion 342 and the third lead portion 343 is the sealing step surface 67. In contact with In this case, the sealing step surface 67 supports the connection portion between the second lead portion 342 and the second terminal portion 172b.
  • a highly versatile sensor SA is referred to as a versatile SA
  • the versatile SA includes the SA main body 170 and the first lead portion 341 while having the second lead portion 342 and the third lead portion 343.
  • the sensor SA 50 is manufactured by connecting the second lead portion 342 and the third lead portion 343 to the first lead portion 341 of the general purpose SA by welding or the like.
  • the sensor SA50 is not manufactured by attaching the lead portions 342 and 343 to the general purpose SA, but the lead terminal 54 having the first lead portion 341, the second lead portion 342 and the third lead portion 343 is a main body of the SA. It may be manufactured by attaching it to 170. Further, the first lead portion 341 of the general purpose SA is a portion corresponding to the lead terminal 54 of the sensor SA50 of the first embodiment, and the sensor SA50 of the first embodiment may also be referred to as a general purpose SA with high versatility. it can.
  • the sensor SA 50 is inserted into the internal space 24 a of the housing 21.
  • the sensor SA 50 inserted from the housing opening 61 is pushed in until the circuit step surface 55 is caught on the area step surface 66.
  • the second lead portion 342 and the third lead portion 343 of the lead terminal 54 are hooked on the sealing step surface 67 before the SA main body 170 is hooked on the area step surface 66.
  • the lead terminal 54 in a state of being caught by the sealing step surface 67 is deformed as a whole, so that the sensor SA 50 can be pushed deeper into the internal space 24 a.
  • a step of connecting the lead terminal 54 and the connector terminal 28a using a connector is performed.
  • a pair of welding electrodes are inserted into the internal space 24a from the housing opening 61, and the second bridge portion 173b and the second terminal portion 172b are sandwiched by these welding electrodes, and the second bridge portion 173b and the second terminal portion Perform welding with 172b.
  • the number of bonding portions requiring bonding work after installing the sensor SA 50 in the internal space 24a is minimized. There is.
  • the welding operation for the lead terminal 54 and the welding operation for the connector terminal 28a are performed separately.
  • the lead terminal 54 and the connector terminal 28a are directly joined, the number of junctions requiring joining operation after the sensor SA 50 is installed in the internal space 24a is It is reduced to half.
  • the lead terminal 54 extends toward the housing opening 61 as a whole even though the lead terminal 54 does not extend straight toward the housing opening 61.
  • the part 342 is disposed in the connector area PC2. That is, the second lead portion 342 is disposed at a position closer to the housing opening 61 than the SA main body 170. In this case, since it is not necessary to insert the bonding tool for bonding the second lead portion 342 and the second terminal portion 172b deep into the internal space 24a, the work load at the time of bonding can be reduced.
  • the lead terminal 54 of the sensor SA 50 is disposed at a position straddling the boundary between the main body area PC 1 and the connector area PC 2.
  • the lead terminal 54 can be directly connected to the connector terminal 28a, the number of welding operations performed in the internal space 24a for electrically connecting the lead terminal 54 and the connector terminal 28a can be reduced. It can be reduced as much as possible. For this reason, it can suppress that position shift of sensor SA50 arises by the welding operation in interior space 24a.
  • the second terminal portion 172b of the connector terminal 28a is supported by the sealing step surface 67, when the second terminal portion 172b and the second lead portion 342 are joined, an unintended The displacement of the terminal portion 172b can be suppressed. For this reason, the second terminal portion 172b is displaced relative to the second lead portion 342 at the time of joining operation, and it is difficult to properly join the second terminal portion 172b and the second lead portion 342. Can be suppressed.
  • the second lead portion 342 inserted between the sealing step surface 67 and the housing opening 61 is supported by the sealing step surface 67 from the opposite side to the housing opening 61 It is done.
  • the second lead portion 342 is easily displaced due to the first lead portion 341 supporting the second lead portion 342 and the third lead portion 343 in a cantilever manner. It has become.
  • the second lead portion 342 is displaced relative to the second terminal portion 172b, thereby increasing the difficulty of the joining operation. There is a concern that bonding may not be properly performed.
  • the first lead portion 341 is a piece of the second lead portion 342 and the third lead portion 343.
  • the state of holding and supporting is eliminated. For this reason, the joining operation of the second lead portion 342 and the second terminal portion 172b can be facilitated.
  • the sealing step surface 67 supporting the second lead portion 342 of the sensor SA 50 is disposed at a position closer to the housing opening 61 than the region step surface 66.
  • the joining tool is Unintended contact with the SA main body 170 can be suppressed.
  • the second terminal portion 172 b and the second lead portion 342 extend from the sealing step surface 67 toward the housing opening 61.
  • a bonding tool such as a welding electrode
  • bonding is performed on the back side of the second terminal portion 172b or the second lead portion 342 as viewed from the housing opening 61
  • this joining operation can be made easy.
  • the lead terminal 54 is created by connecting the second lead portion 342 and the third lead portion 343 to the first lead portion 341 extending from the SA main body 170.
  • the sensor SA 50 can be manufactured using a general-purpose SA that does not have the second lead portion 342 and the third lead portion 343. Therefore, after the connector SA is fixed to the housing 21 and then the sensor SA 50 can be installed in the internal space 24 a of the housing 21, the cost burden for manufacturing the sensor SA 50 can be reduced.
  • the housing 21 may not have the passage 31.
  • the bypass flow passage 30 may have only the measurement flow passage 32.
  • the vertical partition wall 69 extends to the housing bottom 62.
  • all the intake air flowing in from the inflow port 33a is guided to the introduction path 32b of the measurement flow path 32 and discharged from the measurement outlet 33c.
  • the tip end portion of the passage mold portion 104 is not in contact with the outer peripheral mold portions 102 and 103. There is.
  • the flow rate detection unit 22 may be provided in the introduction path 32b or the discharge path 32c.
  • the detection path 32a serves as a connection path connecting the introduction path 32b and the discharge path 32c.
  • the flow rate detection unit 22 is provided in the introduction passage 32b, a configuration in which the sensing support unit 57 in the sensor SA 50 extends toward the front end of the housing to the extent that the sensing support unit 57 reaches the introduction passage 32b.
  • the flow rate detection unit 22 is provided at a position close to the tip end portion of the sensing support unit 57, so that the flow rate detection unit 22 can be disposed in the introduction path 32b.
  • the introduction path 32b and the discharge path 32c may be arranged in the width direction X instead of the depth direction Z.
  • the detection path 32a extends in the width direction X.
  • the flow detection unit 22 properly detects the flow rate simply by saying that the flow direction of the intake air in the detection path 32a is not the depth direction Z. It can be done.
  • the boundary between the sealing area PA and the open area PB may coincide with the sensing step surface 56 instead of the circuit step surface 55 of the sensor SA 50.
  • the area step surface 66 of the housing 21 is disposed at a position in contact with the sensing step surface 56 of the sensor SA 50, and the sealing area PA and the accommodation area PB1 are sealed by the potting portion 65. In this configuration, no gap is formed between the outer peripheral surface of the relay portion 52 of the sensor SA 50 and the inner peripheral surface of the accommodation area PB1 of the housing main body 24.
  • the detection throttling portion 59 may be provided on both sides of the sensing support portion 57 in the width direction X.
  • the housing 21 has a pair of detection throttling portions 59 aligned in the width direction X, and the sensing support portion 57 and the flow rate detection portion 22 are disposed between the detection throttling portions 59.
  • the pair of detection throttling portions 59 and the vertical partition walls 69 do not become thick even if they approach the housing opening 61 as a whole. Thereby, the inner peripheral surface of the housing 21 can be integrally molded.
  • the first outer peripheral mold portion 102 and the second outer peripheral mold portion 103 may be arranged in the depth direction Z instead of the width direction X.
  • the number of molds for molding the outer peripheral surface of the housing 21 may be three or more instead of two as in the case of the outer peripheral molds 102 and 103.
  • the number of mold portions for molding the outer peripheral surface of the housing 21 may be one.
  • the number of mold parts extracted from the housing opening 61 is not limited to one as in the inner peripheral mold part 91, and may be plural.
  • the first inner peripheral mold portion having the introduction molding portion 97b and the second inner peripheral mold portion having the discharge molding portion 97c are formed independently of each other, and in the mold apparatus 90, these inner peripheral mold portions In a state where they are combined with each other, they enter the inside of the outer peripheral molds 102 and 103.
  • the outlet extension 113 for molding the measurement outlet 33c is not included in the outer peripheral molds 102 and 103, but is included in a dedicated mold independent of the outer peripheral molds 102 and 103. It may be done.
  • a dedicated mold portion including the outlet extension portion 113 is provided between the first outer peripheral mold portion 102 and the second outer peripheral mold portion 103 in the mold apparatus 90 in the same manner as the pass-through mold portion 104.
  • the measurement outlet 33c may be provided not in the discharge passage 32c but in the detection passage 32a.
  • the measurement outlet 33 c is provided downstream of the flow rate detection unit 22.
  • the discharge path 32c may not be provided.
  • the entry portion 93 of the inner peripheral mold portion 91 is molded during resin molding of the housing 21. It can be removed from the housing opening 61. In this configuration, the entry portion 93 does not have the discharge molding portion 97c.
  • the configuration that exerts the function as a control device of the combustion system may not be the ECU 20, but may be various arithmetic devices mounted on a vehicle, and a plurality of arithmetic devices cooperate with each other as a control device.
  • the function may be exhibited.
  • various programs may be stored in a non-transitional tangible storage medium such as a flash memory or a hard disk provided in each arithmetic device.
  • the measurement outlet 33c may not be provided on each of the front surface and the rear surface of the housing 21, but the measurement outlet 33c may be provided on one of the front surface and the rear surface. .
  • the measurement outlet 33c is provided on the surface of the housing 21.
  • the housing 21 has an asymmetrical shape on the front side and the back side, and the outlet 33b is also provided on the surface of the housing 21 like the measurement outlet 33c instead of the outer peripheral downstream end 132b.
  • the outlet 33 b and the measurement outlet 33 c are not rectangular but circular.
  • the surface of the housing 21 has, in addition to the flat surface 44 and the curved surface 45, a downstream tapered surface 401 which extends straight from the outer peripheral downstream end 132b toward the upstream with an inclination with respect to the depth direction Z. .
  • the flat surface 44 and the curved surface 45 are arranged horizontally in the depth direction Z, so that the longitudinal boundary portion 131 a is linear in the height direction Y from the flange portion 27 to the tip of the housing 21. And the vertical boundary 131a is not formed.
  • both the flat surface 44 and the downstream tapered surface 401 are arranged horizontally in the depth direction Z, and the tapered boundary 402 which is the boundary between the flat surface 44 and the downstream tapered surface 401 is parallel to the vertical boundary 131 a. It extends.
  • the rear surface of the housing 21 does not have the downstream tapered surface 401, and the flat surface 44 extends in the depth direction Z from the outer peripheral downstream end 132b toward the curved surface 45.
  • the measurement outlet 33c is disposed at a position straddling the vertical boundary portion 131a in the depth direction Z.
  • the outlet 33 b is provided not on the outer peripheral downstream end 132 b but on the flat surface 44 between the longitudinal boundary portion 131 a and the tapered boundary portion 402.
  • the outlet 33b may be provided on the curved surface 45 or the downstream tapered surface 401, or may be provided at a position across the vertical boundary portion 131a in the depth direction Z, similarly to the measurement outlet 33c.
  • the curved surface 45 of the housing 21 may be an outer peripheral inclined surface inclined with respect to the depth direction Z.
  • the outer peripheral inclined surface may be a tapered surface which extends straight from the flat surface 44 toward the outer peripheral upstream end 132a.
  • the outer peripheral inclined surface may be a curved surface so as to be recessed toward the inner peripheral side of the housing 21.
  • the measurement outlet may be provided only on the outer peripheral inclined surface among the outer peripheral flat surface and the outer peripheral inclined surface.
  • the measurement outlet 33 c is provided on the curved surface 45 so as not to protrude to the flat surface 44.
  • the measurement outlet 33c does not straddle the vertical boundary 131a in the depth direction Z, but extends from the vertical boundary 131a toward the outer peripheral upstream end 132a in the depth direction Z, and the outlet downstream end of the measurement outlet 33c 134 b is included in the vertical boundary 131 a.
  • the measurement outlet 33 c is provided on the upstream tapered surface 404 as the outer peripheral inclined surface so as not to protrude to the flat surface 44.
  • the upstream tapered surface 404 is included in the outer peripheral surface of the housing 21 instead of the curved surface 45, and the boundary between the upstream tapered surface 404 and the flat surface 44 is the vertical boundary 131a.
  • the upstream tapered surface 404 extends straight from the longitudinal boundary portion 131a toward the outer peripheral upstream end 132a, and is inclined with respect to the depth direction Z.
  • the outlet downstream end 134b of the measurement outlet 33c is included in the vertical boundary 131a.
  • the measurement outlet 33c is disposed on the outer peripheral inclined surface, and therefore, is not opened downstream. For this reason, even if turbulence of the air flow occurs around the outer peripheral downstream end 132b in the intake passage 12, the flat surface 44 can suppress the disturbance from reaching the measurement outlet 33c. Further, as in the first embodiment, the forward flow air such as the air AF1 flows along the outer peripheral inclined surface before reaching the measurement outlet 33c, whereby the traveling direction is substantially orthogonal to the opening direction of the measurement outlet 33c. Because it changes to the direction, it becomes difficult to flow into the measurement outlet 33c.
  • the measurement outlet 33c is arranged between the outer peripheral upstream end 132a and the vertical boundary 131a.
  • the upstream end of the upstream tapered surface 404 is included in the outer peripheral upstream end 132a
  • the downstream end of the upstream tapered surface 404 is included in the longitudinal boundary 131a
  • the measurement outlet 33c is longitudinal in the depth direction Z It is disposed at a position near the boundary portion 131a.
  • the forward flow air hardly flows into the measurement outlet 33c by flowing along the upstream tapered surface 404 as the outer peripheral inclined surface before reaching the measurement outlet 33c.
  • the measurement outlet 33c is preferably as far as possible from the upstream end of the upstream tapered surface 404 and the outer peripheral upstream end 132a. Therefore, in the depth direction Z, the separation distance L18 between the vertical boundary 131a and the measurement outlet 33c is preferably smaller than the length dimension L13 of the measurement outlet 33c.
  • the measurement outlet 33 c may be disposed at a position near the outer peripheral upstream end 132 a in the depth direction Z. Even in this case, if the measurement outlet 33c and the outer peripheral upstream end 132a are separated in the depth direction Z, it is possible to make the forward air less likely to flow into the measurement outlet 33c.
  • the measurement outlet may be provided only on the outer peripheral flat surface among the outer peripheral flat surface and the outer peripheral inclined surface.
  • the measurement outlet 33 c is provided on the flat surface 44 so as not to protrude to the curved surface 45.
  • the measurement outlet 33c does not straddle the vertical boundary 131a in the depth direction Z, but extends from the vertical boundary 131a toward the outer peripheral downstream end 132b in the depth direction Z, and the outlet upstream end of the measurement outlet 33c 134 a is included in the vertical boundary 131 a.
  • the measurement outlet 33c is provided on the flat surface 44 so as not to protrude to the upstream tapered surface 404 as the outer peripheral inclined surface.
  • the upstream tapered surface 404 is included in the outer peripheral surface of the housing 21 instead of the curved surface 45, and the boundary between the upstream tapered surface 404 and the flat surface 44 is the vertical boundary 131a. It has become.
  • the outlet upstream end 134 a of the measurement outlet 33 c is included in the vertical boundary portion 131 a.
  • the measurement outlet 33 c is disposed at an intermediate position of the flat surface 44 in the depth direction Z.
  • the measurement outlet 33c is disposed between the longitudinal boundary 131a and the outer peripheral downstream end 132b.
  • the upstream end of the flat surface 44 is included in the vertical boundary 131a
  • the downstream end of the flat surface 44 is included in the outer peripheral downstream end 132b
  • the measurement outlet 33c is the vertical boundary in the depth direction Z It is arranged at a position near 131a.
  • the modification B13 even if turbulence of the air flow occurs around the downstream end of the flat surface 44 or around the outer peripheral downstream end 132b, the turbulence can be prevented from reaching the measurement outlet 33c. .
  • the measurement outlet 33c is as far as possible from the downstream end of the flat surface 44 or the outer peripheral downstream end 132b from the viewpoint of suppressing the turbulence of the air flow generated downstream of the measurement outlet 33c from reaching the measurement outlet 33c. . Therefore, in the depth direction Z, the separation distance L19 between the vertical boundary 131a and the measurement outlet 33c is preferably smaller than the length dimension L13 of the measurement outlet 33c.
  • the discharge path 32c of the measurement flow path 32 may be narrowed toward the housing proximal end side in the height direction Y.
  • the measurement flow path 32 is configured to include a bulging area 406 in which a part of the discharge path 32 c is bulging in the depth direction Z.
  • the bulging area 406 is expanded toward the introduction path 32b so that the discharge path 32c and the introduction path 32b are separated by the vertical partition wall 69, and the end of the discharge path 32c on the housing tip side is expanded. It is arranged.
  • the measurement outlet 33c has a portion 407a that opens the entire bulging area 406 in the width direction X, and a portion 407b that protrudes from the vertical partition wall 69 in the opposite direction to the introduction path 32b.
  • the open area of the measurement outlet 33c is larger than in the configuration in which the measurement flow passage 32 does not have the bulging region 406, so the amount of intake air discharged from the measurement outlet 33c Can be increased.
  • the measurement accuracy of the flow rate detection unit 22 can be enhanced by increasing the flow velocity of air in the measurement flow passage 32.
  • the flat surface 44 and the curved surface 45 are included in the end face of the housing distal end side and the end face of the housing proximal end in the outer peripheral face of the housing 21 It is also good.
  • the measurement outlet 33 c is provided on the end face of the housing 21 on the distal end side of the housing or the end face of the housing proximal end.
  • the flat surface 44 may have at least one of the downstream flat portion 137a, the distal flat portion 137b, and the proximal flat portion 137c.
  • the curved surface 45 may have at least one of the upstream curved portion 138a, the distal curved portion 138b, and the proximal curved portion 138c. The point is that the flat surface 44 and the curved surface 45 may be disposed such that the vertical boundary portion 131 a extends in the height direction Y.
  • the vertical boundary portion 131a may be inclined with respect to the height direction Y.
  • the measurement outlet 33c may be disposed at a position across the outer peripheral upstream end 132a in the width direction X on the outer peripheral surface of the housing 21. Even in this case, the open area of the measurement outlet 33c is smaller than the open area of the inflow port 33a, etc., so that it is possible to realize a configuration in which the forward air does not easily flow into the measurement outlet 33c.
  • the flat portion 44 may be provided with a meat theft portion 41. Even in this case, if the measurement outlet 33c and the meat stealing unit 41 are separated in the depth direction Z, even if the air flow is disturbed around the meat stealing unit 41, the disturbance reaches the measurement outlet 33c. Can be suppressed.
  • the downstream formation surface 135b may be a curved surface instead of a tapered surface.
  • the downstream formation surface 135 b may be an inclined surface inclined with respect to the flat surface 44.
  • this curved surface may be curved so as to protrude toward the outer peripheral side of the housing 21, and be recessed toward the inner peripheral side of the housing 21. It may be curved.
  • the housing wall 121 may not be the position holder.
  • the housing main body 24 has a positioning portion 411, and the positioning portion 411 is configured to protrude from the accommodation wall portion 121 toward the inner peripheral side.
  • the housing main body 24 does not have the projecting portion 66a, and the housing wall portion 121 extends from the sealing wall portion 122 toward the front end of the housing. Therefore, in the height direction Y, the boundary between the housing wall 121 and the sealing wall 122 coincides with the boundary between the sealing area PA and the housing area PB1.
  • the positioning portion 411 extends along the inner peripheral surface of the housing wall 121 and is disposed at the end of the housing wall 121 on the proximal end side of the housing.
  • the positioning portion 411 is formed in a plate shape, and the plate surface 411a on the housing base end side of the positioning portion 411 is formed on the circuit step surface 55 of the sensor SA50, similarly to the area step surface 66 of the first embodiment. It is in contact.
  • the plate surface 411a restricts the movement of the sensor SA50 to the front end side of the housing, and corresponds to a third holding unit.
  • the tip end surface 411b of the positioning portion 411 is in contact with the outer peripheral surface of the relay portion 52 of the sensor SA50 in the same manner as the tip end surfaces of the housing protrusions 72a and 72b in the first embodiment, so that the width direction X and the depth are obtained.
  • the movement of the sensor SA 50 in the direction Z is restricted.
  • a portion facing in the width direction X corresponds to a first holding portion
  • a portion facing in the depth direction Z corresponds to a second holding portion.
  • the positioning portion 411 is provided at a position spaced apart from the ring holding portion 25 on the front end side of the housing. In this case, even if deformation due to resin molding occurs in the ring holding portion 25 or the sealing wall portion 122, this deformation is absorbed in the portion between the ring holding portion 25 and the positioning portion 411 in the housing main body 24. It can be thought that. For this reason, it is difficult for the position and shape of the positioning part 411 to change with the deformation of the ring holding part 25 and the sealing wall part 122, and as a result, the positional deviation of the flow rate detection part 22 is suppressed. Be done.
  • the positioning part 411 may be formed of a member different from the housing main body 24.
  • the positioning member 412 forming the positioning portion 411 is attached to the housing main body 24.
  • the positioning member 412 is formed of a conductive metal material or the like. The conductive property of the positioning member 412 in this way makes it easy for the positioning member 412 to discharge the static electricity charged on the insulating housing body 24. For this reason, it can suppress that the detection precision of the flow volume detection part 22 falls with static electricity.
  • the positioning member 412 has a depth portion 412a extending in the depth direction Z and a pair of width portions 412b extending in the width direction X, and each width portion 412b extends in the same direction from both ends of the depth portion 412a There is.
  • a plate surface 411a in contact with the circuit step surface 55 of the sensor SA50 is formed by the plate surfaces of the depth portion 412a and the width portion 412b.
  • a front end surface 411 b in contact with the outer peripheral surface of the relay portion 52 of the sensor SA 50 is formed by the inner peripheral surface of the positioning member 412.
  • a support recess 413 for supporting the positioning member 412 is formed on the inner peripheral surface of the housing body 24.
  • the support recess 413 is a recess recessed toward the outer peripheral side, and extends in a groove shape along the end of the housing wall 121 on the proximal end side of the housing.
  • the positioning member 412 is fitted in the support recess 413 with its outer peripheral end entering the support recess 413, and the positioning member 412 and the housing main body 24 are joined by an adhesive or the like.
  • the depth portion 412 a of the positioning member 412 is disposed on the front surface side of the sensor SA 50 and is not disposed on the back surface side.
  • the housing 21 is not integrally molded as in the first embodiment but is formed by assembling a plurality of members as in the fourth embodiment. For example, after resin-molding the plurality of members and metal-forming the positioning member 412, the plurality of members are assembled to each other so that the positioning member 412 is accommodated in the internal space 24a.
  • the positioning member 412 is a separate member from the housing main body 24, it is possible to increase the freedom of selection of the material forming the positioning portion 411. Further, even when the design and the shape of the sensor SA 50 are changed in accordance with the specification change of the sensor SA 50, the existing housing 21 can be diverted by changing the shape and the size of the positioning member 412.
  • the sensors SA50 and 220 as detection units may have a plurality of physical quantity detection units.
  • the sensor SA 220 includes two physical quantity detection units that detect physical quantities different from one another.
  • the sensor SA220 of this configuration includes a first detection unit 421 that detects the flow rate of air and a second detection unit 422 that detects the temperature of air as physical quantity detection units. Similar to the flow rate detection unit 202 of the fourth embodiment, the first detection unit 421 detects the flow rate of intake air in the measurement flow path 32 by being provided in the measurement flow path 32. Similar to the intake air temperature sensor 23 according to the first embodiment, the second detection unit 422 is provided outside the housing 201 to detect the temperature of the intake air in the intake passage 12.
  • the sensor SA 220 includes a first support portion 423 that supports the first detection portion 421 and a second support portion 424 that supports the second detection portion 422.
  • the first support portion 423 extends from the SA base portion 221 toward the front end of the housing, similarly to the detection support portion 223 of the fourth embodiment.
  • the second support portion 424 extends from the SA base portion 221 toward the upstream wall portion 231 in the depth direction Z, and is disposed at a position near the end of the SA base portion 221 on the housing tip end side.
  • An outer peripheral insertion portion 426 through which the second support portion 424 is inserted is provided on the outer peripheral portion of the housing main body 204, and the second detection portion 422 is exposed to the outside of the housing through the outer peripheral insertion portion 426 in the second support portion 424.
  • the housing main body 204 is provided with a housing recess 427 formed by recessing its outer peripheral surface toward the downstream side.
  • the housing recess 427 is disposed at an intermediate position of the housing main body 204 in the height direction Y.
  • the portion connecting the first restricting portion 251 and the second restricting portion 255 in the fourth embodiment is not provided.
  • a restricting connection portion 428 connecting the first restricting portion 251 and the second restricting portion 255 is provided at a position closer to the downstream wall portion 232 than the upstream wall portion 231, and the restricting connection portion 428
  • the bottom surface of the housing recess 427 is formed by the outer peripheral surface of the housing.
  • the restricting connection portion 428 is included in the base member 261 similarly to the first restricting portion 251 and the second restricting portion 255, and is integrally molded with the restricting portions 251, 255 and the like.
  • the outer periphery insertion portion 426 is provided in the restriction connection portion 428.
  • the outer periphery insertion portion 426 is a through hole penetrating the restriction connection portion 428 in the depth direction Z, and the inner peripheral surface 426a of the outer periphery insertion portion 426 is in contact with the outer peripheral surface of the second support portion 424.
  • the movement of the second support portion 424 in the width direction X and the height direction Y is restricted by the inner peripheral surface 426a of the outer peripheral insertion portion 426, and the inner peripheral surface 426a may be referred to as a positioning surface.
  • the downstream side plate surface of the restricting connection portion 428 is in contact with the outer peripheral surface of the SA base portion 221. In this case, movement of the sensor SA 220 toward the upstream side is restricted by the downstream side plate surface of the restriction connection portion 428, and this downstream side plate surface can be referred to as a positioning surface.
  • the housing 201 may not have the seal member 206.
  • the housing mounting portion is constituted by the flange portion 207, and the thickness of the housing mounting portion is not changed.
  • the housing attachment portion may not necessarily be thicker than the accommodation wall portion 121.
  • the first restricting portion 251 and the second restricting portion 255 may be formed as separate members from the housing main body 204.
  • the first restricting member forming the first restricting portion 251 is attached to the housing main body 204.
  • the first regulating member is formed in a plate shape.
  • a support recess for supporting the first regulating member is formed on the inner peripheral surface of the housing main body 204, and the outer peripheral end of the first regulating member is fitted in the support recess.
  • the first regulating member is formed of a conductive metal material or the like.
  • the depth housing projection 72b of the housing main body 24 may have a function of only one of the first holding portion and the second holding portion.
  • the depth housing protrusion 72b is in contact with a portion orthogonal to the depth direction Z.
  • the depth housing projection 72b of this configuration holds the sensor SA50 in the depth direction Z, and has the function of the first holding portion but does not have the function of the second holding portion.
  • the width housing projection 72a may have the functions of both the first holding portion and the second holding portion.
  • the width housing projection 72a in the outer peripheral surface of the sensor SA 50, the width housing projection 72a is in contact with a portion inclined in both the width direction X and the depth direction Z.
  • the width housing projection 72a of this configuration holds the sensor SA50 in both the width direction X and the depth direction Z, and has the functions of both the first holding portion and the second holding portion.
  • the third holding unit may have at least one function of the first holding unit and the second holding unit.
  • the region step surface 66 of the housing main body 24 is configured to be inclined with respect to the height direction Y without being orthogonal to the height direction Y.
  • the area step surface 66 is inclined with respect to the width direction X and the depth direction Z so as to face the inner peripheral side, and the width direction X and the depth such that the circuit step surface 55 of the sensor SA 50 faces the outer side. It is inclined with respect to the direction Z.
  • the circuit step surface 55 is in a state in which the circuit step surface 55 has entered the inside of the region step surface 66, and the circuit step surface 55 is in contact with the region step surface 66.
  • the movement of the sensor SA 50 is also restricted in the X and depth directions Z.
  • the area step surface 66 has the functions of the first holding unit and the second holding unit.
  • the circuit step surface 55 and the area step surface 66 may be inclined by a tapered surface or may be inclined by a curved surface.
  • the portion of the detection unit which is the sensor SA 50 or 220 and contacts the position holding unit of the housing may not be located near the physical quantity detection unit such as the flow rate detection unit 22 or 202 in the detection unit.
  • the separation distance L3 between the flow rate detection unit 22 and the circuit step surface 55 may be larger than the separation distance L4 between the base end of the sensor SA50 and the circuit step surface 55.
  • the physical quantity measuring device may be fixed to the intake pipe 12a without interposing the seal member such as the O-ring 26 or the seal member 206.
  • the housing has a housing fitting portion that fits into the airflow insertion hole 12b, and the outer peripheral surface of the housing fitting portion is in close contact with the inner peripheral surface of the airflow insertion hole 12b.
  • the housing fitting portion is included in the housing mounting portion, and the position holding portions such as the housing wall portion 121 and the first restricting portion 251 are provided closer to the front end of the housing than the housing fitting portion.
  • the entire part of the housing not entering the intake passage 12 may be the housing attachment portion.
  • a portion of the housing 201 which does not enter the intake passage 12 is also included in the housing attachment portion.
  • a portion of the housing main body 204 facing the inner peripheral surface of the airflow insertion hole 12 b and the inner peripheral surface of the pipe flange 12 c is included in the housing attachment portion.
  • the first restricting portion 251 as the position holding portion is closer to the front end of the housing than the housing attaching portion, even if deformation due to resin molding occurs in the housing attaching portion, the first restricting portion 251 is deformed by the deformation. Unintended changes in the position or shape of can be suppressed.
  • the housing opening may be opened in the depth direction Z.
  • the housing opening 241 is provided in the upstream wall 231 or the downstream wall 232 of the housing body 204. Also in this configuration, it is possible to insert the sensor SA 220 into the internal space 204 a from the housing opening 241 or inject a thermosetting resin from the housing opening 241 into the internal space 204 a.
  • three or more members may be assembled to each other when forming the housing.
  • two cover members of a front cover member and a back cover member are assembled to the base member 261.
  • the front cover member is the cover member 262
  • the back cover member is a member having at least a part of the back wall portion 234 of the housing main body 204.
  • all of the detection units which are the sensors SA 50 and 220 may not be accommodated in the internal space of the housing. That is, at least a part of the detection unit may be accommodated in the internal space.
  • the tip of the lead terminal 54 of the sensor SA 50 is configured to protrude to the outside through the housing opening 61. Also in this configuration, by attaching a member covering the lead terminal 54 to the housing 21, the lead terminal 54 and the connector terminal 28a can be protected.
  • the position holding portions such as the housing wall portion 121 and the first restricting portion 251 may be provided closer to the housing proximal end than the housing mounting portion, as long as the housing is a position separated from the housing mounting portion. Good. Even in this configuration, since the position holding portion and the housing attachment portion are separated, even if the deformation due to resin molding occurs in the housing attachment portion, the position and the shape of the position holding portion change due to this deformation. It can be suppressed.
  • a physical quantity detection unit that detects a physical quantity different from the flow rate of the intake air may be provided in the measurement flow path.
  • the physical quantity detection unit provided in the measurement flow path include a detection unit that detects a temperature, a detection unit that detects a humidity, and a detection unit that detects a pressure. These detection units may or may not be mounted on the sensors SA 50 and 220 as detection units.
  • the physical quantity detection unit that is not mounted on the detection unit may be attached to the inner circumferential surface of the measurement flow channel, or may be attached to a protrusion or the like that protrudes from the inner circumferential surface of the measurement flow channel.
  • the physical quantity detection unit may be provided in the bypass flow channels 30, 210 without being the measurement flow channel. That is, the physical quantity detection unit may be provided in the passage.
  • the mold apparatus may have a plurality of passage mold parts for molding the passage flow path.
  • the passage passage 31 of the housing 21 is formed by the passage mold portions 431a and 431b.
  • the passage 31 of this configuration has a throttle passage portion 433 provided between the inflow passage 31a and the outflow passage 31b. While the throttling passage 433 squeezes the passage 31 toward the outlet 33b, the outlet passage 31b does not squeeze the passage 31 toward the outlet 33b.
  • the wall throttling surface 153 a is included in the inner peripheral surface of the diaphragm passage portion 433, the wall diaphragm surface 153 a is not included in the inner peripheral surface of the outflow passage 31 b.
  • the passage 31 is not narrowed from the throttling boundary portion 434 toward any of the inlet 33a and the outlet 33b. .
  • the mold apparatus 90 has an inflow passage type portion 431a and an outflow passage type portion 431b in place of the passage mold portion 104 of the first embodiment.
  • the passage mold parts 431a and 431b abut on each other and also abut on the measurement and molding part 97, respectively.
  • the inflow passage mold 431a and the outflow passage mold 431b are in contact with each other at their front end faces, and the front end face of the measurement molding unit 97 has a surface on the housing proximal side of each of the passage molds 431a and 431b. It abuts.
  • the inflow passage type part 431a and the outflow passage type part 431b are not thickened toward the respective tip surfaces. Therefore, when removing the mold device 90 from the resin-molded housing 21, it is possible to withdraw the inflow passage mold portion 431a from the inflow port 33a, and withdraw the outflow passage mold portion 431b from the inflow port 33b. It is possible.
  • the inflow-passing part 431a corresponds to the inflow-type part
  • the outflow-passing part 431b corresponds to the outflow-type part.
  • the portion closer to the inlet 33 a than the throttling boundary 434 is molded by the inflow passage die 431 a, and the portion closer to the outlet 33 b than the throttling boundary 434 is an outflow passage It is molded by 431b. Therefore, there is no need to withdraw the inflow passage portion 431a from the outflow port 33b, and there is no need to withdraw the outflow passage portion 431b from the inflow port 33a. Can be enhanced.
  • the inflow passage mold portion 431a can be extracted from the inflow port 33a and the outflow passage mold portion 431b can be extracted from the outflow port 33b, the inner peripheral surface of the passage flow path 31 can be integrally molded.
  • either the pass mold portion or the measurement mold portion has the mold convex portion. It may be done.
  • the measurement and molding unit 97 has the mold protrusion 334 and the pass-through mold unit 104 has the mold recess 335, but the measurement and molding unit 97 has the mold recess 335 and passes The mold portion 104 may have a mold protrusion 334.
  • the front end surface of the passage mold portion 104 is in contact with the measurement molding portion 97 instead of the outer peripheral mold portions 102 and 103.
  • the measurement molding unit 97 intrudes between the passage mold portion 104 and the outer peripheral mold portions 102 and 103 in the passage flow path 31.
  • the tip end surface of the passage mold portion 104 is in contact with the side surface of the measurement molding portion 97.
  • a die protrusion 334 is provided on the tip end surface of the passage die portion 104, and a die recess 335 is provided on the side surface of the measurement molding portion 97.
  • the measurement and molding unit 97 is removed from the housing 21 after the passage die unit 104 is removed from the inflow port 33a.
  • the configuration in which the mold convex portion fits in the mold concave portion may be applied to the modification D1.
  • a die recess 335 is provided in each of the inflow passage die portion 431a and the outflow passage die portion 431b, and in the measurement molding portion 97, a die protrusion 334 which fits in each die recess portion 335 of the passage die portions 431a and 431b is provided. It is assumed to be provided.
  • one of the mold convex portion and the mold concave portion may be provided in the inflow passage mold portion 431a, and the other may be provided in the outflow passage mold portion 431b. In this case, it is possible to restrict the positional deviation between the inflow passage type part 431a and the outflow passage type part 431b in the width direction X or the height direction Y.
  • the mold concave portion 335 may not surround four sides of the mold convex portion 334.
  • the mold recess 335 is opened in the width direction X.
  • the mold recess 335 is a groove extending in the width direction X in the inner passage surface 159, and the mold protrusion 334 has a shape extending along the groove.
  • the mold convex portion 334 enters the inside of the mold concave portion 335, relative movement between the pass-through mold portion 104 and the measurement and molding portion 97 in the depth direction Z is restricted.
  • the inflow port may be opened in a direction inclined with respect to the depth direction Z.
  • the inlet may be opened obliquely to the side opposite to the housing proximal side.
  • the upstream end of the passage floor surface 152 is disposed closer to the outlet 33b than the upstream end of the passage ceiling surface 151. I assume.
  • the length dimension of the passage floor surface 152 in the depth direction Z is smaller than that in the fifth embodiment, and the passage floor surface 152 is also shortened in the height direction Y by the smaller portion. There is. For this reason, the height dimension of the inflow port 33a in the height direction Y is smaller than that of the fifth embodiment, and foreign matter is less likely to enter from the inflow port 33a by the smaller size.
  • the flow path boundary portion 34 may not face the outlet 33b side.
  • the flow path boundary portion 34 extends in the depth direction Z in the same manner as the passing ceiling surface 151. In this configuration, in the mold device 90, the boundary between the measurement and molding unit 97 and the passage die unit 104 coincides with the flow channel boundary.
  • the pass-through may be withdrawn from the outlet instead of the inlet.
  • the passage mold portion 104 is configured to be extracted from the outlet 33 b. In this configuration, it is the same as the first embodiment that the passing die portion 104 is not thickened toward the tip end portion, but the direction in which the passing die portion 104 is assembled to the outer peripheral die portions 102 and 103 is the above The opposite to the one embodiment. Further, contrary to the first embodiment, the passage 31 is configured so as not to be narrowed from the inflow port 33a to the outflow port 33b.
  • the inclination angle ⁇ 3 in the passage floor surface 152 may not be uniform depending on the place. Also in this case, assuming an imaginary line connecting the upstream end and the downstream end of the passage floor surface 152 straight, the inclination angle of the imaginary line with respect to the inflow ceiling portion 332 a is larger than the inclination angle ⁇ 2 of the flow path boundary portion 34 Thus, it is possible to realize a configuration in which the passage mold portion 104 can be extracted from the inlet 33a.
  • the air flow meter 200 may have a terminal support that supports the connector terminal 208a in the connector area QC.
  • a back support 441 as a terminal support is provided between the second terminal 282 b and the back wall 234.
  • the back support portion 441 is formed in a plate shape of a synthetic resin material, and is bonded to the back wall portion 234 by an adhesive or the like in a state of being superimposed on the inner peripheral surface of the back wall portion 234.
  • the second terminal portion 282 b is in contact with the plate surface on the side of the housing opening portion 241 in the back support portion 441.
  • the back support 441 supports the second terminal 282 b from the side opposite to the housing opening 241.
  • the back support portion 441 is in a state of being passed over the second terminal portion 282 b and the lead terminal 224 in the height direction Y. That is, the back support 441 is provided at a position across the boundary between the second terminal 282 b and the lead terminal 224 in the height direction Y.
  • the lead terminal 224 is in contact with the plate surface on the side of the housing opening 241 in the back support 441 as in the second terminal 282 b. In this case, the back support 441 supports the lead terminal 224 from the side opposite to the housing opening 241 in addition to the second terminal 282 b.
  • the SA main body 225 of the sensor SA220 is caught on the back wall 234, and the wall surface 283 on the side of the housing opening 241 in the back wall 234 holds the position of the sensor SA220.
  • the lead terminal 224 of the sensor SA 220 is hooked on the back support 441, and the plate surface 441 a on the housing opening 241 side of the back support 441 holds the position of the lead terminal 224.
  • the wall surface 283 corresponds to a unit holding surface
  • the plate surface 441a corresponds to a terminal holding surface.
  • the back support 441 may be formed of a metal material. Further, the back support portion 441 may be formed by a part of the housing 201. For example, the back support portion 441 is formed by a convex portion in which the back wall portion 234 of the housing 201 protrudes toward the housing opening 241 side. In this configuration, the tip end surface of the convex portion is the plate surface 411 a of the back support portion 441 and corresponds to the terminal holding surface.
  • the second terminal portion 172 b is supported by the back support portion 441 from the opposite side to the housing opening 241. For this reason, the second terminal portion 172b is less likely to be deformed or displaced unintentionally. In this case, it is possible to suppress that the second terminal portion 282b and the lead terminal 224 can not be properly joined by the positional deviation of the second terminal portion 282b with respect to the lead terminal 224.
  • the lead terminal 224 inserted between the housing opening 241 and the back support 441 is supported by the back support 441 from the opposite side to the housing opening 241. For this reason, it is difficult for the lead terminal 224 to be deformed or displaced unintentionally. In this case, the positional displacement of the lead terminal 224 with respect to the second terminal portion 282 b can suppress that the second terminal portion 282 b and the lead terminal 224 can not be properly joined.
  • the plate surface 441 a of the back support 441 supporting the lead terminal 224 of the sensor SA 220 is disposed closer to the housing opening 241 than the wall surface 283 of the back wall 234 supporting the SA body 225. It is done. In this case, when joining the second lead portion 342 and the lead terminal 224, the joint does not have to be inserted at a position deeper than the plate surface 441a, so the joint unintentionally contacts the housing 201. Etc. can be suppressed.
  • the connector terminal 208a and the lead terminal 224 are not in the width direction X or the depth direction Z but in the height direction Y It may be lined with.
  • each of the second terminal portion 282 b and the lead terminal 224 is extended toward the housing opening 241.
  • the second terminal portion 282b of this configuration includes a terminal extension portion 443a extending from the seal holding portion 205 and a terminal rising portion 443b rising from the terminal extension portion 443a toward the housing opening 241.
  • the lead terminal 224 has a lead extension portion 444 a extending from the SA main body 225 and a lead upright portion 444 b standing from the lead extension portion 444 a toward the housing opening 241.
  • the lead standing portion 444b extends in the width direction X along the terminal standing portion 443b, and is joined to the terminal standing portion 443b by welding or the like.
  • the terminal standing portion 443b corresponds to the vertical terminal portion.
  • the terminal rising portion 443b extends from the back support portion 441 toward the housing opening 241.
  • a joint such as a welding electrode
  • the lead terminal 224 and the connector terminal 208a may have a vent 445 as a bend.
  • each of the lead extension part 444a of the lead terminal 224 and the terminal extension part 443a of the connector terminal 208a has a vent 445.
  • each of the lead terminal 224 and the second terminal portion 282 b has a vent 445. In any configuration, the stress applied to the lead terminal 224 and the connector terminal 208 a can be relieved by the vent 445.
  • the sensors SA50 and 220 as detection units may have a plurality of physical quantity detection units.
  • the modification C3 the configuration in which the first detection unit 421 is provided inside the housing 201 and the second detection unit 422 is provided outside the housing 201 is illustrated in the fourth embodiment.
  • the present modification a configuration in which the first detection unit 421 and the second detection unit 422 are both provided inside the housing 201 is illustrated.
  • the first detection portion 421 is disposed on the plate surface on the housing opening 241 side, and the plate on the opposite side to the housing opening 241
  • the second detection unit 422 is disposed on the surface.
  • the first detection portion 421 faces the front wall portion 233
  • the second detection portion 422 faces the back wall portion 234.
  • the sensor SA 220 and the cover member 262 may be attached together to the base member 261 in a state where the sensor SA 220 and the cover member 262 are assembled to each other.
  • the cover unit 447 is formed by assembling the sensor SA 220 and the cover member 262 to each other, and the cover unit 447 is attached to the base member 261. According to this configuration, the number of parts can be reduced and the structure of the air flow meter 200 can be simplified.
  • the internal space of the housing may be sealed by a cover member.
  • the internal space 24 a of the housing 21 is sealed by the cover member 448.
  • the potting portion 65 is not formed because the internal space 24 a is not filled with the thermosetting resin.
  • the cover member 448 is a separate member resin-molded independently of the housing 21, and is fitted to the housing opening 61.
  • the internal space 24 a may be sealed by both the potting portion 65 and the cover member 448.
  • the cover member 448 is attached to the housing opening 61.
  • the internal space 204 a of the housing 201 is sealed by the cover member 449.
  • the opening portion of the base member 261 is not closed by the cover member 262 as in the fourth embodiment, but the entire opening portion of the base member 261 is not the housing opening 241. It is a housing opening 241.
  • the cover member 449 is fitted in the housing opening 241 to close the entire housing opening 241.
  • the internal space 204a may be sealed by both the potting portion 242 and the cover member 449. For example, after the potting portion 242 is formed by filling the interior space 204 a with a thermosetting resin, the cover member 262 is attached to the housing opening 241.
  • the connector terminal may protrude into the main body region. Even in this case, if the connector terminal does not enter between the detection unit and the housing opening in the direction in which the detection unit and the housing opening are aligned, the connector when inserting the detection unit into the internal space of the housing Terminal does not interfere.
  • the second terminal portion 172b is disposed in the main body area PC1 by the connector terminal 28a protruding into the main body area PC1. Also in this configuration, the second terminal portion 172b may not be inserted between the housing opening 61 and the sensor SA50 in the height direction Y.
  • connection terminal portion 172c of the connector terminal 28a may be exposed to the connector region PC2 side.
  • the connection terminal portion 172 c is separated from the sealing step surface 67 toward the housing opening 61. Even in this configuration, if the connection terminal portion 172c and the second terminal portion 172b do not protrude into the main body region PC1, it is possible to suppress that the terminal portions 172b and 172c interfere with the insertion of the sensor SA50 into the internal space 24a.
  • the second terminal portion 172b may extend not in the height direction Y but in the width direction X or the depth direction Z.
  • the connector region in the inner space of the housing, may not be disposed between the housing opening and the unit body in the alignment direction of the housing opening and the detection unit.
  • the sealing step surface 67 is arranged at a position farther from the housing opening 61 than the lead terminal 54 in the height direction Y.
  • the connector area PC2 in the width direction X, is disposed side by side with the sensor SA50.
  • a part of the connector terminal may not necessarily be embedded in the housing.
  • the connector terminal is attached to the housing.
  • the detection unit may be installed in the internal space of the housing after the connector terminal is attached to the housing. it can.
  • the detection unit installed in the internal space of the housing may be covered and covered by the cover member from the housing opening side.
  • the cover member 448 in this configuration also covers the connection portion 183.
  • the cover member 448 has a portion which has entered the internal space 24a and a portion which is superimposed on the end face of the lip 89, and the portion which has entered the internal space 24a fits on the inner circumferential surface 180 of the sealing area PA. It is united.
  • both the potting portion 65 and the cover member 448 are provided with respect to the internal space 24a, and the cover member 448 is disposed on the opposite side of the potting portion 65 to the sensor SA50. In this case, at least one of the potting portion 65 and the cover member 448 may seal the internal space 24 a.
  • the cover member 448 is resin-molded using a mold apparatus or the like as a separate member from the housing 21. Then, after the sensor SA 50 is installed in the internal space 24 a of the housing 21 and the potting portion 65 is formed by injecting a thermosetting resin into the internal space 24 a or the like, the cover member 448 is attached to the housing 21. In this case, the cover member 448 is fixed to the inner circumferential surface 180 of the sealing area PA and the end face of the lip 89 using an adhesive, a molten resin or the like.
  • the sensor SA 220 installed in the internal space 204 a is covered and covered with the cover member 449 from the housing opening 241 side. .
  • the cover member 448 formed as a separate member from the housing 21 is attached to the housing 21 so that the sensor SA 50 installed in the internal space 24 a is covered and covered by the cover member 448.
  • the cover member 448 is attached to the housing 21, pressure is hard to be applied to the internal space 24 a, so that the positional deviation of the sensor SA 50 is difficult to occur. Therefore, it can be suppressed that the detection accuracy of the flow rate detection unit 22 varies from product to product.
  • the housing may have a storage groove for storing the thermosetting resin when the thermosetting resin overflows from the housing opening.
  • the housing 21 is configured to have a storage groove 461 for storing the potting material 185 overflowing from the housing opening 61.
  • the storage groove 461 extends annularly along the peripheral edge of the housing opening 61, and is disposed at a position spaced apart from the lip 89 on the outer peripheral side on the opposite side to the sealing area PA with the lip 89 interposed therebetween.
  • the storage groove 461 is provided on a housing base end surface 192 which is a base end surface of the housing 21 and is opened in the height direction Y.
  • the housing base end surface 192 is formed by the outer peripheral surface of the housing main body 24, the outer peripheral surface of the flange portion 27, etc.
  • the storage groove 461 is provided in a portion formed by the outer peripheral surface of the housing main body 24 in the housing base end surface 192. ing. Reservoir groove 461 may be provided on a portion of housing base end surface 192 formed by the outer peripheral surface of flange portion 27.
  • the overflowing potting material 185 is stored in the storage groove 461. Ru. Therefore, the potting material 185 spreads more widely than the storage groove 461, and adhesion of the potting material 185 to unintended portions such as the air flow meter 14 and the work bench can be suppressed.
  • the housing may not have the opening rib portion.
  • the lip 89 as the opening rib does not extend from the housing main body 24 and is stored on the outer peripheral side of the housing opening 61 as in the modification F2.
  • the groove 461 is provided.
  • the housing opening 61 is formed not by the lip 89 but by the housing body 24, and the reservoir groove 461 is disposed at the housing proximal end 192.
  • the potting material 185 overflowing from the housing opening 61 is stored in the storage groove 461 as in the modification F2.
  • the housing 21 may not have both the lip 89 and the storage groove 461. Even in this configuration, the potting material 185 is moved from the housing opening 61 by adjusting the amount of the potting material 185 injected into the internal space 24 a so that the liquid surface or fluid surface of the potting material 185 does not reach the housing opening 61. It can suppress overflow.
  • the inner circumferential surface of the opening rib portion and the inner circumferential surface of the housing main body are not flush with each other, and a step is formed between the inner circumferential surface of the opening rib portion and the inner circumferential surface of the housing main body It may be done.
  • the inner peripheral surface of the lip 89 is disposed on the outer peripheral side of the inner peripheral surface of the housing main body 24 Do.
  • an opening step surface 463 facing the housing opening 61 is formed between the inner peripheral surface of the lip 89 and the inner peripheral surface of the housing main body 24.
  • the opening step surface 463 annularly extends along the peripheral edge of the housing opening 61 similarly to the lip 89.
  • the worker injects the potting material 185 into the internal space 24a
  • the potting material 185 even if the potting material 185 reaches the opening step surface 463, the potting material 185 has not yet reached the housing opening 61, and the potting material 185 overflows the housing opening 61 beyond the lip 89. Can be suppressed.
  • an inner circumferential recess formed by recessing the inner circumferential surface of the housing may be provided at the open end of the inner space.
  • a position where the inner peripheral recess 464 in which the inner peripheral surface 180 of the sealing area PA is recessed extends over the inner peripheral surface 180 and the housing base end surface 192.
  • the configuration provided in The inner circumferential recess 464 is also open toward the housing opening 61 and extends annularly along the periphery of the housing opening 61.
  • the inner circumferential surface of the inner circumferential recess 464 forms an inner circumferential surface 180.
  • the worker injects the potting material 185 into the inner space 24 a
  • the potting material 185 has not yet reached the housing opening 61, and the potting material 185 passes from the housing opening 61 beyond the inner circumferential recess 464. It can control that it overflows.
  • an inner recessed groove 465 for storing the potting material 185 which has entered the inside of the inner peripheral recess 464 is provided in the inner peripheral recess 464.
  • the concave inner groove 465 is formed on a surface of the inner peripheral surface of the inner circumferential concave portion 464 facing the housing opening 61 and is opened toward the housing opening 61.
  • the recessed inner groove 465 extends annularly along the inner circumferential recess 464.
  • the volume of the inner circumferential recess 464 is increased by the volume of the concave inner groove 465. For this reason, even if the potting material 185 injected into the internal space 24 a reaches the inner circumferential recessed portion 464, the amount of the potting material 185 required to be injected before the potting material 185 reaches the housing opening 61 increases. There is. Accordingly, the potting material 185 overflowing the housing opening 61 beyond the inner circumferential recess 464 is less likely to occur due to the volume of the inner recess 465.
  • a chamfered portion obtained by chamfering the inner peripheral end of the housing base end surface may be provided at the open end of the inner space.
  • a chamfered portion 466 obtained by chamfering the protruding corner portion of the housing 21 is provided so as to extend across the housing base end surface 192 and the inner peripheral surface 180.
  • the chamfered portion 466 is a chamfered surface obtained by chamfering the protruding corner portion where the housing base end surface 192 and the inner circumferential surface 180 of the sealing region PA intersect, and the sealing region PA is directed to the housing base end surface 192 in the height direction Y. It extends straight in a direction to gradually expand.
  • the chamfer 466 extends annularly along the peripheral edge of the housing opening 61.
  • the potting material 185 be injected into the inner space 24a until reaching the chamfered portion 466 within the range where the potting material 185 does not overflow from the inner space 24a.
  • the potting material 185 is likely to crawl up the chamfered portion 466, and the potting surface 193 is expanded by an amount corresponding to the potting material 185 crawling up the chamfered portion 466. It can be enlarged. Thereby, the visibility of the information unit 194 can be enhanced.
  • the chamfered portion 466 may be a curved surface.
  • the curved surface include a curved surface in which the chamfered portion 466 bulges toward the housing base end surface 192 in the height direction Y, and a curved surface in which the chamfered portion 466 is recessed toward the housing distal end surface 191 side.
  • the inner peripheral curved surface of the inner peripheral surface of the housing may not necessarily be curved as long as it is curved to expand to the outer peripheral side.
  • the inner circumferential curved surface may be bent at a plurality of points so as to bulge outward. Even in this case, when the thermosetting resin is injected into the inner space of the housing, the thermosetting resin is contained in the inside of the housing by connecting the two inner peripheral flat surfaces intersecting each other with the inner peripheral curved surface. It is possible to suppress crawling around the surface.
  • the filler when forming the filling portion such as the potting portion 65 with a filler such as the potting material 185, the filler is slowly cured at normal temperature instead of forcibly curing the filler by applying heat. It may be cured.
  • thermosetting resin such as the potting material 185 is not used as a filler to be filled in the internal space of the housing, but is cured by irradiation of a photocurable resin or ultraviolet light which is cured by light irradiation.
  • An ultraviolet curable resin may be used.
  • an adhesive that cures when exposed to air or provided with water may be used. The point is that a curable resin which is cured by the application of heat, light, air, water or the like may be filled in the internal space as a filler. Even in this case, the filler can be formed by curing the filler filled in the inner space. In addition, a filler will form the filling part by hardening to such an extent that own shape can be hold
  • the internal space of the housing may be sealed by a cover member.
  • the cover member is resin-molded as a separate member from the housing 21, and the cover member is attached to the housing 21 so as to close the internal space 24a from the housing opening 61 side.
  • the cover member corresponds to the sealing portion, and the information portion 194 is provided on the outer surface of the cover member. Even with this configuration, the outer surface of the cover member is enlarged by increasing the size of the housing opening 61 and the internal space 24a, so that the visibility of the information portion 194 can be improved.
  • the SA main body 170 of the sensor SA 50 and the connector terminal 28a may be arranged in the depth direction Z. Even in this case, when the sensor SA50 is inserted into the internal space 24a from the housing opening 61, it is possible to suppress that the connector terminal 28a becomes an obstacle.
  • the housing opening 61 may not be in the height direction Y, but may be in the width direction X or the depth direction Z. Even in this case, in the height direction Y, it is preferable that the housing opening 61 be disposed on the opposite side of the sensor SA 50 and the ring holding portion 25 to the inflow port 33 a. That is, it is preferable that the potting surface 193 be disposed outside the intake pipe 12 a in a state where the air flow meter 14 is attached to the intake pipe 12 a. Thereby, the worker can visually recognize the information portion 194 of the potting surface 193 without removing the air flow meter 14 from the intake pipe 12a.
  • the second temperature detection unit 506 is not mounted on the lead frame 82 if it is disposed between the housing base end surface 192 and the first temperature detection unit 505. It is also good.
  • the second temperature detection unit 506 is mounted on the circuit chip 81.
  • the substrate of the circuit chip 81 corresponds to the circuit substrate on which the element of the second temperature detection unit 506 is mounted.
  • the second temperature detection unit 506 may be mounted on the relay substrate 83, the lead terminal 54, or the like.
  • the difference between the second correction signal and the first correction signal Sb1 is calculated. It may be done.
  • the second correction unit 513 is configured not to perform response correction of the temperature difference signal Sb2, but to perform response correction of the second temperature signal Sa2.
  • the second correction unit 513 performs response correction of the second temperature signal Sa2 to calculate a second correction signal Sb11, and outputs the second correction signal Sb11 to the temperature difference unit 512.
  • the second correction unit 513 uses the change mode of the second temperature signal Sa2 in the same manner as the first correction unit 511 corrects the first temperature signal Sa1 using the change mode of the first temperature signal Sa1. 2 Correct the temperature signal Sa2. Further, the second correction unit 513 corrects the second temperature signal Sa2 in the same manner as the first correction unit 511 uses the flow rate signal Sa3 or the flow rate conversion signal Sb4 to correct the first temperature signal Sa1.
  • the flow rate conversion signal Sb4 is used.
  • the temperature difference unit 512 does not calculate the difference correction signal Sb3, but calculates a corrected difference signal Sb12 that is the difference between the first correction signal Sb1 and the second correction signal Sb11. Then, the correction amount calculation unit 515 calculates the correction amount signal Sb5 using the corrected difference signal Sb12 and the flow rate conversion signal Sb4.
  • the second temperature signal Sa2 is used as a correction parameter for the correction of the first temperature signal Sa1. Therefore, even if the correction amount signal Sb5 is calculated using the corrected difference signal Sb12 instead of the difference correction signal Sb3, the error of the correction value signal Sc with respect to the actual temperature Sd can be reduced. Therefore, the measurement accuracy of the correction value signal Sc can be enhanced as compared with a configuration in which the second correction signal Sb11 is not used to correct the first temperature signal Sa1.
  • the response correction of the temperature difference signal Sb2 may not be performed.
  • the temperature correction unit 510 does not have the second correction unit 513.
  • the temperature difference signal Sb2 calculated by the temperature difference unit 512 is directly input to the correction amount calculation unit 515.
  • the second temperature signal Sa2 is used as a correction parameter for the correction of the first temperature signal Sa1. Therefore, even if the correction amount signal Sb5 is calculated using the temperature difference signal Sb2 instead of the difference correction signal Sb3, an error of the correction value signal Sc with respect to the actual temperature Sd can be reduced. Therefore, as in the modification H2, the measurement accuracy of the correction value signal Sc can be enhanced.
  • the second temperature signal Sa2 may not be used to correct the first temperature signal Sa1.
  • the temperature correction unit 510 does not have the temperature difference unit 512, the second correction unit 513, the correction amount calculation unit 515, and the correction value calculation unit 516.
  • the first correction signal Sb1 output from the first correction unit 511 is acquired as the correction value signal Sc.
  • the change mode of the first temperature signal Sa1 and the flow rate signal Sa3 are used as correction parameters for the correction of the first temperature signal Sa1. Therefore, even if the second temperature signal Sa2 is not used to correct the first temperature signal Sa1, the responsiveness of the correction value signal Sc to the actual temperature Sd can be enhanced.
  • the air flow meter 14 may not have the second temperature detection unit 506.
  • the flow rate signal Sa3 may not be used to correct the first temperature signal Sa1.
  • the temperature correction unit 510 does not have the second correction unit 513, the characteristic conversion unit 514, and the correction amount calculation unit 515.
  • the correction value calculation unit 516 calculates the correction value signal Sc using the second temperature signal Sa2 instead of the correction amount signal Sb5.
  • the second temperature signal Sa2 is used to correct the first temperature signal Sa1. Therefore, even if the flow rate signal Sa3 is not used to correct the first temperature signal Sa1, an error of the correction value signal Sc with respect to the actual temperature Sd can be reduced.
  • the airflow meter 14 may not have the flow rate detection unit 22.
  • the response correction of the first temperature signal Sa1 may not be performed.
  • the temperature correction unit 510 does not have the first correction unit 511, the correction amount calculation unit 515, and the correction amount calculation unit 515.
  • the correction value calculation unit 516 calculates the correction value signal Sc using the first temperature signal Sa1 instead of the first correction signal Sb1.
  • the second temperature signal Sa2 is used to correct the first temperature signal Sa1. Therefore, even if the change mode of the first temperature signal Sa1 is not used to correct the first temperature signal Sa1, the error of the correction value signal Sc with respect to the actual temperature Sd can be reduced.
  • the correction value calculation unit 516 integrates the signal based on the first temperature signal Sa1 and the signal based on the second temperature signal Sa2 and the flow rate signal Sa3.
  • the correction value signal Sc may be calculated by multiplication or the like. For example, as shown in FIG. 118, the correction value calculation unit 516 calculates the correction value signal Sc by multiplying the first correction signal Sb1 and the temperature difference signal Sb2. Further, as shown in FIG. 119, the correction value calculation unit 516 calculates the correction value signal Sc by multiplying the first temperature signal Sa1 by the difference correction signal Sb3.
  • the flow rate is It does not have to be mounted on the detection substrate 22 a of the detection unit 22.
  • the first temperature detection unit 505 is mounted on the relay substrate 83 or the lead frame 82.
  • At least one of the first temperature detection unit 505 and the second temperature detection unit 506 may not be mounted on the sensor SA50.
  • the first temperature detection unit 505 may be embedded in the vertical partition wall 69 of the housing 21 or the second temperature detection unit 506 may be mounted on the connector terminal 28a.
  • the flow rate detection unit 22 and the first temperature detection unit 505 may be mounted on mutually independent substrates as long as they are provided in the measurement flow channel 32. Further, the flow rate detection unit 22 and the first temperature detection unit 505 may be disposed at positions separated in the height direction Y from each other. Even in this case, since the detection targets of the flow rate detection unit 22 and the first temperature detection unit 505 are the intake air flowing through the measurement flow path 32, the responsiveness of the first temperature signal Sa1 using the flow rate signal Sa3 can be enhanced. it can.
  • the physical quantity corrected based on the change mode of itself is the temperature, but the correction target is a physical quantity different from the temperature such as the flow rate of the intake air, humidity, and pressure. It may be taken.
  • a first pressure detection unit that detects pressure as a physical quantity detection unit is provided in the measurement flow channel 32, and a second pressure detection unit functions as a homogeneous pressure detection unit that detects a physical quantity of the same type as the first pressure detection unit.
  • the first pressure detection unit is disposed at a position closer to the housing base end surface 192. In this configuration, in the measurement control device, the first pressure signal that is the detection result of the first pressure detection unit is corrected using the second pressure signal that is the detection result of the second pressure detection unit.
  • the physical quantity measuring apparatus has a temperature detecting part for detecting temperature as a heterogeneous detecting part for detecting a physical quantity of a type different from pressure, and in the measurement control apparatus, the temperature which is the detection result of the temperature detecting part The signal is used to correct the first pressure signal. Furthermore, in the measurement control device, the correction of the first pressure signal is performed using the change aspect of the first pressure signal. According to these configurations, with regard to measurement of pressure as a physical quantity, it is possible to enhance the measurement accuracy of pressure and the responsiveness of pressure measurement.
  • the measurement control device that performs the correction process of the first temperature signal Sa1 may be configured by another control device included in the air flow meter 14 instead of the circuit chip 81. .
  • the measurement control device may be provided separately from the air flow meter 14 in an external device such as the ECU 20.
  • the first temperature signal Sa1, the second temperature signal Sa2, and the flow rate signal Sa3 are input from the first temperature detection unit 505, the second temperature detection unit 506, and the flow rate detection unit 202 to the ECU 20 via the circuit chip 81.
  • the measurement control device may be various arithmetic devices mounted on a vehicle, and a plurality of arithmetic devices may cooperate to exhibit a function as a control device.
  • various programs may be stored in a non-transitional tangible storage medium such as a flash memory or a hard disk provided in each arithmetic device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre d'air (14) qui comprend une partie d'insertion (501) qui est insérée dans un tuyau d'admission (12a), et une partie saillante (502) qui fait saillie sans entrer dans le tuyau d'admission. En outre, le débitmètre d'air comprend une première unité de détection de température (505) prévue sur la partie d'insertion, et une seconde unité de détection de température (506) prévue dans une position plus proche de la surface de base de boîtier (192) que la première unité de détection de température. Les unités de détection de température contiennent chacune un capteur (SA50), et la première unité de détection de température détecte la température de l'air d'admission s'écoulant à travers le trajet d'écoulement de mesure (32), et la seconde unité de détection de température détecte la température interne du débitmètre d'air dans le capteur. De cette manière, il est possible d'améliorer la précision de la mesure de quantité physique.<u /> <u />
PCT/JP2018/025186 2017-07-24 2018-07-03 Dispositif de mesure de quantité physique et dispositif de commande de mesure WO2019021762A1 (fr)

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DE112018003773.8T DE112018003773T5 (de) 2017-07-24 2018-07-03 Messvorrichtung für eine physikalische Größe und Messsteuerungsvorrichtung
US16/749,504 US20200158550A1 (en) 2017-07-24 2020-01-22 Physical quantity measurement device and measurement control device

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JP2017142855 2017-07-24
JP2017-142855 2017-07-24
JP2017-247429 2017-12-25
JP2017247429A JP2019023610A (ja) 2017-07-24 2017-12-25 物理量計測装置及び計測制御装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11448543B2 (en) 2017-07-24 2022-09-20 Denso Corporation Quantity measurement device with detection unit contacting housing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59203931A (ja) * 1983-05-04 1984-11-19 Kawasaki Steel Corp 流体温度計の補正方法
WO2004113848A1 (fr) * 2003-06-18 2004-12-29 Hitachi, Ltd. Air-metre thermique
JP2016109625A (ja) * 2014-12-09 2016-06-20 株式会社デンソー エアフロメータ
US20160178446A1 (en) * 2014-12-22 2016-06-23 Abb Technology Ag Device for measuring the temperature of a medium through a wall
JP2016523368A (ja) * 2013-06-25 2016-08-08 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング 測定センサを通過する気体の温度を決定するための方法及び装置
JP2016170135A (ja) * 2015-03-16 2016-09-23 三菱電機株式会社 流量測定装置に一体に設けられた物理量測定装置および物理量測定方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59203931A (ja) * 1983-05-04 1984-11-19 Kawasaki Steel Corp 流体温度計の補正方法
WO2004113848A1 (fr) * 2003-06-18 2004-12-29 Hitachi, Ltd. Air-metre thermique
JP2016523368A (ja) * 2013-06-25 2016-08-08 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング 測定センサを通過する気体の温度を決定するための方法及び装置
JP2016109625A (ja) * 2014-12-09 2016-06-20 株式会社デンソー エアフロメータ
US20160178446A1 (en) * 2014-12-22 2016-06-23 Abb Technology Ag Device for measuring the temperature of a medium through a wall
JP2016170135A (ja) * 2015-03-16 2016-09-23 三菱電機株式会社 流量測定装置に一体に設けられた物理量測定装置および物理量測定方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11448543B2 (en) 2017-07-24 2022-09-20 Denso Corporation Quantity measurement device with detection unit contacting housing

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