JP2020201053A - Physical quantity measuring device - Google Patents

Abstract

To provide a physical quantity measuring device capable of providing a communication passage through which additives are exposed.SOLUTION: A physical quantity measuring device 1 includes: a sensor 13 for detecting a physical quantity of gas; and a housing 10 that is formed of a resin to which an additive 113 is mixed and that covers the sensor. The housing is provided with a communication passage 111 that communicates the inside and the outside. The additive is exposed to the communication passage. The physical quantity measuring device has a non-woven fabric-like structure formed by the exposed additive. Due to the non-woven structure, the communication passage is waterproof and moisture permeable.SELECTED DRAWING: Figure 1

Description

The present invention relates to a physical quantity measuring device.

Conventionally, in an automobile engine using an electronic control system, a temperature measuring device, a humidity measuring device, or the like is arranged in addition to a flow rate measuring device for measuring an intake air amount. In recent years, automobile manufacturers or suppliers are required to reduce the man-hours for assembling parts to vehicles and reduce the cost of each device.

In the technique of Patent Document 1, the environment sensor is mounted on the second surface of the circuit board and arranged in the measurement room. Environmental sensors include a temperature measuring device, a humidity measuring device, and a pressure measuring device. The measurement room has a communication port that communicates with the main passage. As a result, it is possible to reduce the number of processes by integrating the flow rate measuring device and the environment sensor. A waterproof / breathable filter is provided at the communication port.

Japanese Unexamined Patent Publication No. 2016-75506

In Patent Document 1, a waterproof / breathable filter is provided at a communication port that communicates inside and outside the measurement chamber. However, since a structure for fixing the waterproof / breathable filter is required, the number of parts of the measuring device increases. In the case where there is no filter, a step of assembling the filter and the fixed portion of the filter is added.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a physical quantity measuring device provided with a communication passage through which additives are exposed.

The physical quantity measuring device includes a sensor for detecting the physical quantity of gas and a housing formed of a resin mixed with an additive and covering the sensor, and the housing includes a communication passage for communicating the inside and the outside. Additives are exposed in the corridors.

According to the present invention, it is possible to provide a communication passage through which the additive is exposed.

The schematic diagram of the physical quantity measuring apparatus in 1st Example. Enlarged view of area A. Flow chart of manufacturing of physical quantity measuring device. Explanatory drawing of additive at the time of resin molding. Explanatory drawing of the formation method of the communication passage. Explanatory drawing of the modification of the physical quantity measuring apparatus. The schematic diagram of the physical quantity measuring apparatus in 2nd Example. Explanatory drawing of the modification of the physical quantity measuring apparatus. Top view of the physical quantity measuring device in the third embodiment. The explanatory view of the engine in 4th Example. An explanatory view of the outside of the physical quantity measuring device. Explanatory drawing of the internal structure of a physical quantity measuring device. FIG. 5 is a schematic cross-sectional view of the physical quantity measuring device shown in FIG. 11 cut along the line XIII-XIII. The explanatory view of the physical quantity measuring apparatus in 5th Example. FIG. 6 is a schematic cross-sectional view of the physical quantity measuring device shown in FIG. 14 cut along the XV-XV line.

The present embodiment relates to a physical quantity measuring device having a waterproof and breathable communication passage in the housing. Hereinafter, examples will be described with reference to the drawings, but the present invention is not limited to the examples described in the drawings.

The direction in which the cover portion is located with respect to the sensor may be indicated as an upward direction. The direction in which the support portion is located with respect to the sensor may be indicated as the downward direction. The "physical quantity" indicates a gas state. The gas state is, for example, temperature, humidity, pressure, or the like.

FIG. 1 (1) is a schematic view of the physical quantity measuring device 1 in the first embodiment. FIG. 1 (2) is a schematic cross-sectional view of the physical quantity measuring device 1 of FIG. 1 (1) cut along the line I-I. The physical quantity measuring device 1 measures the temperature or pressure of the intake air of the engine. The physical quantity measuring device 1 includes a housing 10 and a temperature / humidity sensor 13 as an example of a “sensor”. The space formed inside the housing 10 may be referred to as a circuit chamber 14.

The housing 10 is formed of a resin 112 (see FIG. 2) in which the additive 113 is mixed, and covers the temperature / humidity sensor 13. The housing 10 includes, for example, a cover portion 11 and a support portion 12 that supports the temperature / humidity sensor 13. The cover portion 11 is provided on a predetermined surface 121 of the support portion 12 on which the temperature / humidity sensor 13 is provided, and covers the temperature / humidity sensor 13. The cover portion 11 includes an upper surface 116 located upward from the temperature / humidity sensor 13, and a side surface 117 provided at an end of the upper surface 116 and facing the support portion 12.

The upper surface 116 includes a communication passage 111 for ventilating the circuit chamber 14 and the outside air. The communication passage 111 is formed so as to penetrate from the first surface 114 on the inner surface of the housing 10 to the second surface 115 on the outer surface of the housing 10. The communication passage 111 will be described later in FIG.

An electronic component that drives the temperature / humidity sensor 13 is mounted on the support portion 12. The end portion 1171 in the downward direction of the side surface 117 abuts on the end portion of the support portion 12. In addition, waterproofness may be ensured between the support portion 12 and the side surface 117 by a seal member or the like. The support 12 may be provided with a connector that is electrically connected to the vehicle circuit.

The temperature / humidity sensor 13 detects the temperature and humidity of the gas. The sensor included in the physical quantity measuring device 1 is not limited to the temperature / humidity sensor 13, and may be at least one of a pressure sensor, a temperature sensor, and a humidity sensor. That is, the sensor included in the physical quantity measuring device 1 detects the physical quantity of the gas. The sensor included in the physical quantity measuring device 1 is not limited to the pressure sensor, the temperature sensor or the humidity sensor, and may be another sensor.

The temperature / humidity sensor 13 may be provided substantially in the center of the support portion 12. The communication passage 111 may be provided coaxially with the temperature / humidity sensor 13. The communication passage 111 is not limited to being provided coaxially with the temperature / humidity sensor 13, and may be provided at another position.

FIG. 2 is an enlarged view of region A. The communication passage 111 is formed by missing the resin 112 constituting the housing 10. That is, the continuous passage 111 is formed by melting the resin 112 using a laser or the like. The additive 113 added at the time of resin molding is exposed in the communication passage 111.

The additive 113 is fibrous and entangles with each other to form a non-woven fabric-like structure 1131. The communication passage 111 is formed at a position where the non-woven fabric-like structure 1131 is exposed. As a result, the communication passage 111 has waterproof property for preventing external water droplets and the like from entering the circuit chamber 14, and moisture permeability for passing external water vapor. The additive 113 is, for example, glass or carbon. In the figure, a plurality of additives 113 are shown, but one additive 113 may be designated by a reference numeral and the other additives 113 may be omitted from the reference numerals.

The width w1 of the communication passage 111 is set shorter than the fiber length m of the additive 113. That is, the width w1 of the communication passage 111 is set to a length at which the additive 113 does not separate from the resin 112. The width w1 of the communication passage 111 is set, for example, between 0.05 mm and 1 mm. The width w1 of the communication passage 111 is not limited to being set between 0.05 mm and 1 mm, and may be set to another length.

FIG. 3 is a manufacturing flow chart of the physical quantity measuring device 1. In the manufacturing step of the physical quantity measuring device 1, the support portion 12 is molded (S1), and the temperature / humidity sensor 13 is mounted on the support portion 12 (S2). The manufacturing step manufactures the housing 10 (S3). In the manufacturing step (S3) of the housing 10, the parts of the resin 112 are molded (S31), and the parts molded in step S31 are heated (S32) in order to form the communication passage 111. Step S31 and step S32 will be described later in FIG.

After the steps (S2) and the manufacturing step (S3) of the housing 10 are completed, the housing 10 is mounted on the support portion 12 (S4). As a result, the physical quantity measuring device 1 is manufactured. The physical quantity measuring device 1 is not limited to the steps (S1) to (S4) described above, and may be manufactured by another manufacturing method.

FIG. 4 (1) is an explanatory view of the additive 113 at the time of resin molding. At the time of resin molding in the step (S31), the additive 113 is required to have a non-woven fabric-like structure 1131. Additive 113 is added to the liquid resin 112 before resin molding for the purpose of improving strength or heat resistance. The resin 112 to which the additive 113 is added is injected from the gate 21 into the mold 41 (1). The resin 112 injected from the gate 21 flows so as to fill the cavity of the mold 41 (1).

The mold 41 (1) includes a gate side wall surface 42, a facing wall surface 43 facing the gate side wall surface 42, and a convex portion 44 (1) formed on the facing wall surface 43 side. When the mold 41 (1) and the molds 41 (2) to 41 (4) described later in FIG. 5 are not particularly distinguished, they may be referred to as the mold 41.

The resin 112 injected from the gate 21 reaches the facing wall surface 43. The resin 112 flows along the gate side wall surface 42 and the facing wall surface 43 so as to fill the mold 41 (1).

The movement of the resin 112 that has reached the convex portion 44 (1) is different depending on whether the resin 112 flows along the side wall surface 42 of the gate or flows around the convex portion 44 (1). That is, for example, the resin 112 that flows along the gate side wall surface 42 moves without staying because there are no obstacles in the flow direction. On the other hand, in the resin 112 that flows along the facing wall surface 43, the convex portion 44 (1) becomes an obstacle in the flow direction, so that the resin 112 may stay or flow while wrapping around the convex portion 44 (1). is there. The flow of the resin 112 that has passed through the convex portion 44 (1) becomes more complicated than that before passing through the convex portion 44 (1). As a result, in the region 1121 (1) after passing through the convex portion 44 (1), the fiber direction of the additive 113 mixed with the resin 112 becomes complicated.

That is, the mold 41 includes a stirring portion that disturbs the flow direction of the resin 112 between the portion to be provided with the communication passage 111 and the gate 21. The stirring unit disturbs the flow of the resin 112 by widening or narrowing the flow path of the resin 112. The stirring portion is, for example, a convex portion 44 (1), 44 (2), a concave portion 44 (3), a bent portion 44 (4), or the like. The fiber direction of the additive 112 is complicated by the stirring portion, and a non-woven fabric-like structure 1131 can be formed.

FIG. 4 (2) is an explanatory diagram of heating the resin 112 in step S32. In order to form the communication passage 111, the region 1121 (1) of the resin 112 is heated by, for example, the laser 23. Since the melting point of the additive 113 is higher than the melting point of the resin 112, the heating temperature is set between the melting temperature of the resin 112 and the melting temperature of the additive 113. That is, the laser 23 precipitates the additive 113 by heating the resin 112 in the region 1121 (1) at a heating temperature that deforms or volatilizes the resin 112.

As a result, the structure 1131 of the non-woven fabric can be exposed while providing the communication passage 111 in which the resin is missing in the housing 10. In addition, glass flakes other than fibrous, inorganic fillers such as mica, talc or glass beads, other additives or modifiers and the like may be blended to the extent that the effects of the present invention are not impaired.

The mold 41 is not limited to being provided with the convex portion 44 (1), and as shown in FIG. 5, the convex portion 44 (2), the concave portion 44 (3), the bent portion 44 (4), etc. , The additive 113 may be provided with a structure for complicating the fiber direction. FIG. 5 (1) shows a mold 41 (2) provided with a convex portion 44 (2). The convex portion 44 (2) is provided on the gate side wall surface 42 of the mold 41 (2). When the resin 112 injected into the mold 41 (2) passes through the convex portion 44 (2), the flow becomes more complicated than before passing through the convex portion 44 (2). As a result, in the region 1121 (2) after passing through the convex portion 44 (2), the fiber direction of the additive 113 becomes complicated.

FIG. 5 (2) shows a mold 41 (3) provided with a recess 44 (3). The recess 44 (3) is provided on the gate side wall surface 42 of the mold 41 (3). When the resin 112 injected into the mold 41 (3) passes through the recess 44 (3), the flow becomes more complicated than before passing through the recess 44 (3). As a result, in the region 1121 (3) after passing through the recess 44 (3), the fiber direction of the additive 113 becomes complicated.

FIG. 5 (3) shows a mold 41 (4) including a bent portion 44 (4). When the resin 112 injected into the mold 41 (4) passes through the bent portion 44 (4), the flow becomes more complicated than before passing through the bent portion 44 (4). As a result, in the region 1121 (4) after passing through the bent portion 44 (4), the fiber direction of the additive 113 becomes complicated (region 1121 (4)).

The physical quantity measuring device 1 shown above can expose the non-woven fabric-like additive 113 by providing the communication passage 111. The non-woven fabric-like additive 113 exposed from the communication passage 111 functions as a porous body. As a result, the communication passage 111 can be provided with moisture permeability through which water vapor particles pass and waterproofness for preventing water such as rain from entering the housing 10. As a result, the physical quantity measuring device 1 can be provided with waterproof and breathable properties without using an additional member such as a filter, so that the cost at the time of manufacturing can be suppressed.

The size of water vapor particles contained in the gas is smaller than the size of raindrops and drizzle particles. The size of the raindrops may be considered, for example, to be about 2000 μm. The magnitude of water drizzle may be considered, for example, to be about 200 μm. The size of the vapor particles may be considered, for example, to be about 0.0004 μm. If the gap between the fibers of the additive 113 is between the size of the water vapor particles and the size of the drizzle, the communication passage 111 can be provided with waterproof and breathable properties. It is considered that the gap between the fibers of the additive 113 constitutes, for example, a vent having a size of about 0.5 to 3 μm. As a result, the physical quantity measuring device 1 can be provided with waterproof and breathable properties.

Since the waterproof / breathable filter is in the form of a thin film, there is a problem that it is easily damaged when it is attached to the device. For example, when the filter is artificially attached to the device, it is conceivable that the filter can be broken by human force. The physical quantity measuring device 1 in this embodiment can be provided with waterproof and breathable properties by means of a continuous passage 111 without using a filter. As a result, the physical quantity measuring device 1 can be manufactured more easily than using a filter.

The communication passage 111 is not limited to the upper surface 116 of the housing 10, but may be provided on the side surface 117. As shown in FIG. 6, the support portion 12a may be provided with a communication passage 111a. The physical quantity measuring device 1a includes a housing 10a and a temperature / humidity sensor 13. The housing 10a includes a cover portion 11a and a support portion 12a. The cover portion 11a includes an upper surface 116a and a side surface 117. In this case, the support portion 12a is formed of the resin 112 to which the additive 113 is mixed. When the communication passage 111a is formed in the support portion 12a, the cover portion 11a may be formed of metal.

Since this embodiment corresponds to a modified example of the first embodiment, the differences from the first embodiment will be mainly described. FIG. 7 (1) is a schematic view of the physical quantity measuring device 1b. FIG. 7 (2) is a diagram showing the physical quantity measuring device 1b shown in FIG. 7 (1) from the “B” direction. In the physical quantity measuring device 1b, the communication passage 111b is formed by the cover portion 11b and the support portion 12. The physical quantity measuring device 1b includes, for example, a housing 10b and a temperature / humidity sensor 13.

The housing 10b is formed of a resin 112 in which the additive 113 is mixed, and covers the temperature / humidity sensor 13. The housing 10b includes, for example, a cover portion 11b and a support portion 12. The cover portion 11b is provided on a predetermined surface 121 of the support portion 12 and covers the temperature / humidity sensor 13. The cover portion 11b includes an upper surface 116b located upward from the temperature / humidity sensor 13 and a side surface 117b provided at the end of the upper surface 116. The side surface 117b includes a recess 1172 at an end portion 1171b that comes into contact with the support portion 12.

The recess 1172 is formed by missing the resin 112 that constitutes the housing 10b. That is, the recess 1172 is formed by melting the resin 112 with the laser 23 or the like. The additive 113 added at the time of resin molding is exposed in the recess 1172. The exposed additive 113 is in the form of a non-woven fabric.

When the end portion 1171b of the side surface 117b comes into contact with the support portion 12, a communication passage 111b that communicates the outside with the circuit chamber 14 is formed. That is, by closing the opening of the recess 1172 with a predetermined surface 121 of the support portion 12, a continuous passage 111b filled with the non-woven fabric-like additive 113 is formed.

The physical quantity measuring device 1b shown above can be provided with the communication passage 111b by providing the recess 1172 at the end portion 1171b of the side surface 117b. As a result, the physical quantity measuring device 1b can be provided with the communication passage 111b even when it is difficult to form a through hole in the housing 10b.

As shown in FIG. 8, the physical quantity measuring device 1c may form a continuous passage 111c by providing a recess 1211 on a predetermined surface 121c of the support portion 12c. FIG. 8 (2) is a view of the physical quantity measuring device 1c shown in FIG. 8 (1) as viewed from the “C” direction. The physical quantity measuring device 1c includes a housing 10c and a temperature / humidity sensor 13. The housing 10c includes a cover portion 11c and a support portion 12c. A recess 1211 is formed on the predetermined surface 121c of the support portion 12c from the end portion of the support portion 12c toward the center. The recess 1211 is formed longer than the thickness of the side surface 117.

The recess 1211 is formed by missing the resin 112 that constitutes the support portion 12c. That is, the recess 1211 is formed by melting the resin 112 with the laser 23 or the like. The recess 1211 exposes the additive 113 added during resin molding. The exposed additive 113 is in the form of a non-woven fabric.

When the end portion 1171 of the side surface 117 abuts on the predetermined surface 121c of the support portion 12c, a communication passage 111c that communicates the outside with the circuit chamber 14 is formed. That is, by closing the opening of the recess 1211 with the end portion 1171 of the side surface 117, a continuous passage 111c filled with the non-woven fabric-like additive 113 is formed.

The physical quantity measuring device 1c shown above can form the communication passage 111c by providing the support portion 12c with the recess 1211. As a result, in the physical quantity measuring device 1c, the housing 10c can be made of metal, so that the heat dissipation of the internal circuit can be improved.

Since this embodiment corresponds to a modified example of the first embodiment, the differences from the first embodiment will be mainly described. FIG. 9 is a top view of the physical quantity measuring device 1d. FIG. 8 (2) is a schematic cross-sectional view of the upper surface 116d shown in FIG. 8 (1) cut along an IX-IX line. The physical quantity measuring device 1d includes a plurality of communication passages 111d. Although a plurality of passages 111d are shown in the figure, reference numerals may be omitted.

The physical quantity measuring device 1d includes a housing 10d and a temperature / humidity sensor 13. The housing 10d includes a cover portion 11d and a support portion 12. A plurality of communication passages 111d are formed on the upper surface 116d of the cover portion 11d. The communication passages 111d are not limited to the upper surface 116d of the cover portion 11d, but may be formed on the side surface of the cover portion 11d, the support portion 12, or the like.

Each communication passage 111d is formed by missing the resin 112 constituting the housing 10d. That is, each passage 111d is formed by melting the resin 112 by the laser 23 or the like. The additive 113 added at the time of resin molding is exposed in each passage 111d. The exposed additive 113 is in the form of a non-woven fabric. As a result, each passage 111d is waterproof and breathable.

The fiber length m of the additive 113 is considered to be, for example, about 0.5 mm, and it is considered that about 1 to 2 mm of the long fiber may stay in the resin. The fiber length m of the additive 113 is not limited to the above-mentioned length.

Laser processing is one of the means for volatilizing the resin 112, and the productivity changes depending on the thickness of the housing 10d and the width w2 of the communication passage 111d. Considering the productivity, it is considered that the processing diameter has an aspect ratio of 1:10 between the processing diameter and the resin thickness. Thereby, the width w2 of the communication passage 111d is set to a length between, for example, 0.05 mm and 1 mm.

The aspect ratio between the processing diameter and the resin thickness is not limited to 1:10, and may be other values. Not limited to laser machining, the communication passage 111d may be formed in the housing 10d by another method. A suitable processing diameter may be set depending on the thickness of the resin 112 or the fiber length m of the additive 113 used. The width w2 of the communication passage 111d is not limited to the range of 0.05 mm to 1 mm, and may be set to another length.

As the width of the passage is larger, more external gas can be taken into the housing. As a result, the physical quantity measuring device can measure the physical quantity of the gas more efficiently. However, when the width of the communication passage larger than the fiber length of the additive is set, it is conceivable that the additive is separated from the resin. As a result, it is considered that the continuous passage impairs the non-woven fabric structure and it is difficult to maintain the waterproof and breathable property. Further, the additive separated from the resin may become dust and come into contact with the sensor circuit. Therefore, there is a limit to improving the gas uptake efficiency by increasing the width of the communication passage.

By providing the plurality of communication passages 111d, the physical quantity measuring device 1d shown above can increase the total cross-sectional area of the communication passages 111 in a state where the additive 113 is attached to the resin 112. As a result, the physical quantity measuring device 1d can improve the efficiency of taking in the external gas. As a result, the physical quantity measuring device 1d can efficiently measure the physical quantity of the gas.

Since this embodiment corresponds to a modified example of the first embodiment, the differences from the first embodiment will be mainly described. FIG. 10 is an explanatory diagram of the engine 50. The physical quantity measuring device 1e provided in the engine 50 measures the physical quantity of the inhaled gas 62. The engine 50 includes, for example, a cylinder 60, a piston 59, a spark plug 57, an injector 55, an intake valve 56, an intake manifold 54, a throttle valve 53, a main passage 52, a physical quantity measuring device 1e, and intake air. It includes a filter 51 and an exhaust valve 61. The operation of the engine 50 is controlled by an electronic control unit (ECU: Electronic Control Unit) 64.

The gas 62 sucked into the engine 50 is dust-removed by the intake filter 51. The gas 62 passes through the main passage 52, and the humidity, the flow rate, and the like are measured by the physical quantity measuring device 1e. The physical quantity measuring device 1e transmits the information of the gas 62 to the electronic control device 64. The electronic control device 64 controls the throttle valve 53 to adjust the flow rate of the gas 62.

The gas 62 passes through the intake manifold 54, and fuel is injected by the injector 55. When the intake valve 56 is opened, the gas 62 mixed with fuel flows into the combustion chamber 58. The gas 62 is compressed by raising the piston 59. The gas 62 is burned by the spark plug 57. The gas 62 burns and expands to lower the piston 59. By opening the exhaust valve 61, the gas 63 after combustion is exhausted.

FIG. 11 is an explanatory view of the outside of the physical quantity measuring device 1e. FIG. 11 (2) is a diagram showing the physical quantity measuring device 1e shown in FIG. 11 (1) from the “E” direction. The physical quantity measuring device 1e measures the physical quantity of the gas 62. The physical quantity measuring device 1e is inserted into the main passage 52 through a mounting hole provided in the passage wall of the main passage 52. The physical quantity measuring device 1e includes a housing 201 and a cover 202 attached to the housing 201. The housing 201 is constructed, for example, by injection molding a synthetic resin material. The cover 202 is made of, for example, a plate-shaped resin. A fibrous additive 113 (see FIG. 13) is mixed with the resin constituting the housing 201 and the cover 202.

The housing 201 includes a flange 211, a connector 212, and a measuring unit 213. The flange 211 fixes the measuring unit 213 to the intake body which is the main passage 52. The connector 212 electrically connects the internal circuit of the physical quantity measuring device 1e and the electronic circuit of the electronic control device 64 or the like. The connector 212 is formed so as to project from the flange 211 in a predetermined direction.

The measuring unit 213 is provided with various sensors and measures the information of the gas 62. The measuring unit 213 is formed so as to project from the flange 211 toward another direction facing the predetermined direction. When the physical quantity measuring device 1e is attached to the main passage 52, the measuring unit 213 projects from the inner wall of the main passage 52 toward the center of the main passage 52.

The measurement unit 213 includes a support surface 222 facing the cover 202 and supporting the circuit board 207 described later, an upstream surface 223 located on the upstream side of the gas 62, and a downstream surface 224 located on the downstream side of the gas 62. .. The upstream surface 223 and the downstream surface 224 are narrower than the support surface 222. In the protruding direction of the measuring unit 213, the upstream surface 223 is shorter than the downstream surface 224.

An opening 231 is provided on the tip end side of the measuring unit 213. The opening 231 opens in the upstream direction and takes in the gas 62 flowing from the upstream. The cover 202 is provided with a communication passage 111e. The communication passage 111e will be described later with reference to FIG.

FIG. 12 is an explanatory diagram of the internal configuration of the physical quantity measuring device 1e. The measurement unit 213 includes a circuit chamber 235 that houses the circuit board 207, and a first sub-passage passage 251 and a second sub-passage passage 252 that allow air taken in from the opening 231 to pass through. The circuit chamber 235 is provided on the upstream side of the measuring unit 213. The first sub-passage passage 251 is formed so as to allow the gas 62 taken in from the opening 231 to pass toward the downstream side. The second sub-passage passage 252 is formed so as to branch from the middle of the first sub-passage passage and allow the gas 62 to pass toward the downstream side.

The circuit board 207 has, for example, a rectangular shape extending along the longitudinal direction of the measuring unit 213. The circuit board 207 is provided with, for example, a chip package 208, a pressure sensor 204, a temperature / humidity sensor 206, and an intake air temperature sensor 203. The chip package 208, the pressure sensor 204, the temperature / humidity sensor 206, and the intake air temperature sensor 203 may be provided on the surface of the circuit board 207 facing the communication passage 111e.

The pressure sensor 204 detects the pressure of the gas 62. The flow rate sensor 205 detects the flow rate of the gas 62. The temperature / humidity sensor 13 detects the humidity of the gas 62. The intake air temperature sensor 203 detects the temperature of the gas 62. As will be described later, the pressure sensor 204, the flow rate sensor 205, the temperature / humidity sensor 206, and the intake air temperature sensor 203 are arranged in this order on the circuit board 207, for example, from the base end side to the tip end side of the measurement unit 213. ..

For example, a flow rate sensor 205 and an LSI (Large-Scale Integration), which is an electronic component that drives the flow rate sensor 205, are mounted on the chip package 208. The chip package 208 is provided on the circuit board 207 at a central position in the longitudinal direction of the circuit board 207, for example. The chip package 208 arranges the flow rate sensor 205 in the second sub-passage groove 252, for example. That is, it is provided on the circuit board 207 with a part of the chip package 208 protruding into the second sub-passage groove 252. The chip package 208 is not limited to the mounting state described above, and may be provided on the circuit board 207 in other states.

The pressure sensor 204 is located, for example, on the proximal end side of the measuring unit 213 with respect to the chip package 208. The temperature / humidity sensor 206 is located, for example, on the tip side of the measuring unit 213 with respect to the chip package 208. The pressure sensor 204 and the temperature / humidity sensor 206 are not limited to the above-mentioned positions, but may be provided on the circuit board 207 at other positions.

The intake air temperature sensor 203 is electrically connected to the circuit board 207 by a lead. The mounting portion of the intake air temperature sensor 203 is located, for example, on the tip side of the measuring unit 213 with respect to the temperature / humidity sensor 206. The intake air temperature sensor 203 is mounted so as to project in the other direction from the circuit board 207. The intake air temperature sensor 203 is arranged at a position exposed to the outside of the measuring unit 213.

FIG. 13 is a schematic cross-sectional view of the physical quantity measuring device 1e shown in FIG. 11 cut along the line XIII-XIII. The communication passage 111e communicates the circuit chamber 235 and the main passage 52, and takes in the gas 62 of the main passage 52 into the circuit chamber 235. The temperature / humidity sensor 206 and the pressure sensor 204 measure the gas 62 taken in from the communication passage 111e.

The communication passage 111e is formed in a direction substantially perpendicular to the direction of the gas 62 flowing through the main passage 52. That is, the communication passage 111e is formed so as to penetrate from the first surface 2021 to the second surface 2022 of the cover 202 located substantially parallel to the flow direction of the gas 62. The first surface 2021 indicates the surface of the cover 202 on the circuit chamber 235 side. The second surface 2022 indicates a surface facing the first surface 2021.

The communication passage 111e may be provided coaxially with the temperature / humidity sensor 206. The communication passage 111e is not limited to being provided coaxially with the temperature / humidity sensor 206, and may be provided at another position.

The communication passage 111e may be formed at a position that suppresses the deterioration of waterproofness. Examples of the position where the waterproof property is impaired include a position where the water droplets on the flow of the gas 62 directly hit the opening of the communication passage 111e, a position where the water droplets stay, and the like. That is, the communication passage 111e may be formed in the cover 202 so as to open toward the downstream side of the gas 62, for example.

The communication passage 111e is formed by missing the resin constituting the cover 202. That is, the continuous passage 111e is formed by melting the resin using a laser 23 or the like. The additive 113 added at the time of resin molding is exposed in the communication passage 111e. The communication passage 111e may be formed in the housing 201.

The additive 113 is fibrous and becomes a non-woven fabric by being entangled with each other. The additive 113 exposed by the communication passage 111e is in the form of a non-woven fabric. As a result, the communication passage 111e has a waterproof property that prevents external water droplets and the like from entering the circuit chamber 235, and a moisture permeability that allows external water vapor to pass through.

By providing the cover 202 with the communication passage 111e, the physical quantity measuring device 1e shown above can form the communication passage 111e in a direction substantially perpendicular to the flow of the gas 62. As a result, the physical quantity measuring device 1e can prevent the water droplets on the flow of the gas 62 from directly hitting the opening of the communication passage 111e. Since the water droplets adhering to the communication passage 111e move by the flow of the gas 62 passing through the main passage 52, the physical quantity measuring device 1e can suppress the retention of the water droplets. As a result, the continuous passage 111e can improve the waterproof property.

Since this embodiment corresponds to a modified example of the fourth embodiment, the differences from the fourth embodiment will be mainly described. FIG. 14 is an explanatory diagram of the physical quantity measuring device 1f. The physical quantity measuring device 1f provided in the engine 50 measures the physical quantity of the gas 62.

The physical quantity measuring device 1f includes a housing 201 and a cover 202f attached to the housing 201. The cover 202f is made of, for example, a plate-shaped resin. A fibrous additive is mixed with the resin constituting the cover 202f. The cover 202f includes a communication passage 111e and a groove portion 31.

FIG. 15 is a schematic cross-sectional view of the physical quantity measuring device 1f shown in FIG. 14 cut along the XV-XV line. The groove portion 31 is formed in an annular shape around the communication passage 111e, for example. The groove portion 31 is not limited to the annular shape, and may have other shapes.

In the physical quantity measuring device 1f shown above, by providing the groove portion 31 around the communication passage 111e, water droplets transmitted to the communication passage 111e can be diverted along the groove portion 31. As a result, the physical quantity measuring device 1f can prevent water droplets from reaching the communication passage 111. Thereby, the waterproof property of the physical quantity measuring device 1f can be improved.

When molding the cover 202, for example, a mold 41 (2) provided with a convex portion 44 (2) may be used. A groove 31 is formed on the cover 202 by the convex portion 44 (2). By injecting the resin 112 from the outside of the groove portion 31, the resin containing the additive 113 passes through the convex portion 44 (2). Since the flow of the resin 112 is disturbed by passing through the convex portion 44 (2), a non-woven fabric-like additive is generated in the region surrounded by the groove portion 31. As a result, the physical quantity measuring device 1f can generate the non-woven fabric-like additive 113 in the range surrounded by the groove portion 31.

Vehicles are expected to be used in a variety of environments. The physical quantity measuring device is required to correspond to the environment to which the vehicle belongs. For example, in a low temperature environment, it may be difficult for a physical measuring device to measure a gas due to freezing of water droplets adhering to a continuous passage.

The physical quantity measuring device 1f can guide water droplets to the groove portion 31 by providing the groove portion 31. As a result, the physical quantity measuring device 1f can prevent the communication passage 111e from being blocked due to freezing of water droplets. As a result, the physical quantity measuring device 1f can be operated normally in a low temperature environment.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs are designed without departing from the spirit of the present invention described in the claims. You can make changes. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

The disclosure of this embodiment includes the following inventions. "A sensor that detects the physical quantity of gas and a housing that covers the sensor are provided. The housing is molded from a resin in which a fibrous additive is mixed, and by heating the resin, a non-woven fabric-like additive is produced. A method for manufacturing a physical quantity measuring device that forms a communication passage that connects the outside and the inside so as to be exposed. "

1 ... Physical quantity measuring device, 10 ... Housing, 11 ... Cover part, 12 ... Support part, 13 ... Temperature / humidity sensor, Circuit room ... 14,111 ... Communication passage , 113 ... Additive, 114 ... First surface, 115 ... Second surface, 116 ... Top surface, 117 ... Side surface, 1171 ... End, 121 ... Predetermined surface

Claims (10)

A sensor that detects the physical quantity of gas and
It is formed of a resin mixed with additives and includes a housing that covers the sensor.
The housing is provided with a communication passage that communicates the inside and the outside.
A physical quantity measuring device in which the additive is exposed in the communication passage. A non-woven fabric-like structure is formed by the exposed additives.
The physical quantity measuring device according to claim 1, wherein the continuous passage is waterproof and breathable due to the non-woven fabric-like structure. The physical quantity measuring device according to claim 1, wherein the communication passage is formed so as to penetrate from a first surface on the inner surface of the housing to a second surface on the outer surface of the housing. The housing is
A support portion that supports the sensor and
A cover portion that comes into contact with a predetermined surface of the support portion and covers the sensor is provided.
The physical quantity measuring device according to claim 1, wherein the communication passage is formed in at least one of the support portion and the cover portion. The physical quantity measuring device according to claim 1, wherein the housing includes a plurality of the communication passages. The physical quantity measuring device according to claim 1, wherein the width of the communication passage is set shorter than the length of the fiber of the additive. The physical quantity measuring device according to claim 6, wherein the width of the communication passage is set between 0.05 mm and 1 mm. The physical quantity measuring device according to claim 1, wherein the communication passage is formed in a direction substantially perpendicular to the direction of the gas flowing outside. The physical quantity measuring device according to claim 3, wherein the second surface of the housing is provided with a groove around the communication passage. The physical quantity measuring device according to claim 1, wherein the sensor is at least one of a pressure sensor, a temperature sensor, and a humidity sensor.

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