CN117605580A

CN117605580A - Throttle valve device

Info

Publication number: CN117605580A
Application number: CN202310542487.5A
Authority: CN
Inventors: 関口眞一; 佐藤志生; 北冈竜也
Original assignee: Mikuni Corp
Current assignee: Mikuni Corp
Priority date: 2022-08-22
Filing date: 2023-05-15
Publication date: 2024-02-27
Also published as: JP2024029374A

Abstract

The present invention provides a throttle valve device capable of improving formability, reducing cost, improving freedom degree in assembly, miniaturizing, etc., and detecting temperature and pressure of intake air with high accuracy. Comprising the following steps: a throttle body having a main passage through which intake air passes, a mounting surface formed on the outer wall, and a communication passage that opens at the mounting surface and communicates with the main passage; a throttle valve for opening and closing the main passage; and a sensor unit coupled to the mounting surface, the sensor unit including: a housing having a joint surface joined to the mounting surface, and a recess recessed from the joint surface and communicating with the communication path; a circuit substrate embedded in the housing; a pressure sensor electrically connected to the circuit board and detecting a pressure of the intake air guided to the recess; and a temperature sensor electrically connected to the circuit board and detecting a temperature of the intake air guided to the recess.

Description

Throttle valve device

Technical Field

The present invention relates to a throttle device that is applied to an intake system of an internal combustion engine mounted on a motorcycle or the like and includes a sensor that detects the pressure and temperature of intake air.

Background

In an intake system of a conventional motorcycle or the like, as a sensor unit attached to a throttle body (throttle body), there is known a sensor unit including: a unit case including a joint surface joined to a mounting surface of the throttle body and a hollow cylindrical body protruding from the joint surface; the circuit substrate is buried in the unit shell; a temperature detecting element such as a thermistor connected to the circuit board and disposed inside the cylindrical body; and a resin sealing agent that embeds the circuit board so as to cover the circuit board from the outside (for example, refer to patent document 1 and patent document 2).

However, in the above-described sensor unit, since the cylindrical body housing the intake air temperature sensor is formed so as to protrude from the joint surface of the unit case, it is necessary to operate the cylindrical body so as not to collide with another object, resulting in an increase in the size of the entire sensor unit.

Further, since the cylindrical body is disposed so as to protrude into the intake passage of the throttle body, the intake resistance increases, and the degree of freedom in assembly to the throttle body decreases. Further, since the cylindrical body is integrally formed with the unit case, in the case of molding the unit case using a resin material, complication of a mold or the like, reduction in formability, increase in cost, and the like are caused.

As a throttle device including an intake air temperature sensor that detects a temperature of intake air, there is known a throttle device including: a throttle body defining an intake passage; and a throttle valve that opens and closes an intake passage, the throttle body including a bypass passage that bypasses the throttle valve and an attachment hole that opens to the outside in the middle of the bypass passage, the intake air temperature sensor being configured by a cylindrical body that is inserted into the attachment hole of the throttle body, and a temperature detection element that is disposed inside the cylindrical body (for example, refer to patent document 3).

However, in the throttle device, since the intake air temperature sensor is disposed in the passage formed in the throttle body, the degree of freedom in assembly to the throttle body is reduced, and in the case where a sensor (for example, a pressure sensor or the like) different from the intake air temperature sensor is disposed, the degree of freedom in assembly is further reduced, and further, the operation is complicated.

[ Prior Art literature ]

[ patent literature ]

Patent document 1 Japanese patent laid-open publication No. 2019-20251

[ patent document 2] Japanese patent No. 3914128 publication

[ patent document 3] Japanese patent laid-open No. 5-17138 publication

Disclosure of Invention

[ problem to be solved by the invention ]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a throttle valve device capable of improving formability, reducing cost, improving degree of freedom in assembly, miniaturizing, and the like, and detecting the pressure and temperature of intake air with high accuracy.

[ means of solving the problems ]

The throttle valve device of the invention has the following structure: a throttle body having a main passage through which intake air passes, a mounting surface formed on the outer wall, and a communication passage that opens at the mounting surface and communicates with the main passage; a throttle valve for opening and closing the main passage; and a sensor unit that is joined to the mounting surface, and includes: a housing having a joint surface joined to the mounting surface, and a recess recessed from the joint surface and communicating with the communication path; a circuit substrate embedded in the housing; a pressure sensor electrically connected to the circuit board and detecting a pressure of the intake air guided to the recess; and a temperature sensor electrically connected to the circuit board and detecting a temperature of the intake air guided to the recess.

In the throttle device, the communication passage may be configured such that the recess communicates with the main passage on a downstream side of the throttle valve.

In the throttle device, the housing may include an annular groove formed on the joint surface so as to surround the periphery of the recess, and a seal member that is tightly joined to the mounting surface of the throttle body may be disposed in the annular groove.

In the throttle device, the following structure may be adopted, including: a bypass passage branching from the main passage, introducing intake air and bypassing the throttle valve to introduce the intake air into the main passage; and an adjustment valve that adjusts a passage area of the bypass passage.

In the throttle device, the communication path may include a first communication path and a second communication path that communicate the concave portion with the main path, respectively.

In the throttle device, the pressure sensor may be disposed so as to face the recess near the first communication path, and the temperature sensor may be disposed so as to face the recess near the second communication path.

In the throttle device, the temperature sensor may be a lead sensor connected to the circuit board via a lead.

In the throttle device, the casing may include a protruding wall protruding in the recess, and the lead sensor as the temperature sensor may be covered with the protruding wall.

In the throttle device, the temperature sensor may be a chip-type sensor surface-mounted on a circuit board.

In the throttle device, the housing may include a protection wall formed at a position deeper than the recess from the joint surface, and an extension passage extending from the recess to the protection wall, and the chip-type sensor as the temperature sensor may be covered with the protection wall.

In the throttle device, the extension passage may include a first extension passage and a second extension passage.

In the throttle device, a passage member that is fitted into the housing to define the second extension passage may be provided.

In the throttle device, the first extension passage may be in communication with the recess, and the second extension passage may be in communication with the second communication passage.

In the throttle device, the second extension passage may include a straight passage facing the protection wall, and a curved passage interposed between the straight passage and the second communication passage.

In the throttle device, a passage member that is fitted into the housing may be provided to define a second extension passage including a straight passage and a curved passage.

[ Effect of the invention ]

According to the throttle device having the above-described structure, it is possible to improve the formability, reduce the cost, improve the degree of freedom in assembly, reduce the size, and the like, and detect the pressure and the temperature of intake air with high accuracy.

Drawings

Fig. 1 is a view showing a throttle device according to a first embodiment of the present invention, and is an external perspective view when viewed from an upstream side oblique direction of a main passage through which intake air passes.

Fig. 2 is a view showing the throttle device according to the first embodiment, and is an external perspective view when viewed from the downstream side oblique direction of the main passage through which intake air passes.

Fig. 3 is an exploded perspective view of the throttle device according to the first embodiment, as seen from the upstream side of the main passage.

Fig. 4 is an exploded perspective view of the throttle device of the first embodiment, as seen from another oblique direction on the upstream side of the main passage.

Fig. 5 is a cross-sectional view of the throttle valve device according to the first embodiment, cut by a surface passing through the center of the stem and the main passage.

Fig. 6 is a partial cross-sectional perspective view showing a bypass passage (upstream-side passage) through which intake air is introduced from an upstream-side main passage in the throttle device according to the first embodiment.

Fig. 7 is a partial cross-sectional perspective view showing a bypass passage (downstream-side passage) that leads intake air to a downstream-side main passage in the throttle device according to the first embodiment.

Fig. 8 is a partial cross-sectional view partially showing a region of a communication path (first communication path and second communication path) in which a recess portion in which a temperature sensor and a pressure sensor are arranged so as to face each other communicates with a main path in the throttle device according to the first embodiment.

Fig. 9 is a perspective cross-sectional view of a sensor unit mounted in the throttle device according to the first embodiment, the sensor unit being cut by a plane passing through the center of the pressure sensor.

Fig. 10 is a perspective cross-sectional view of a sensor unit mounted in the throttle device according to the first embodiment, the sensor unit being cut by a plane passing through the center of the temperature sensor.

Fig. 11 is a cross-sectional view of a sensor unit mounted in the throttle device according to the first embodiment, the sensor unit being cut by a plane passing through the center of the temperature sensor and the center of the pressure sensor.

Fig. 12 is an exploded perspective view of a housing and a circuit board to which a temperature sensor and a pressure sensor are connected, in a sensor unit mounted in the throttle device according to the first embodiment.

Fig. 13 is a schematic view showing a main passage, a bypass passage, communication passages (first communication passage and second communication passage), and a sensor unit in the throttle device according to the first embodiment.

Fig. 14 is an external perspective view showing a sensor unit mounted in the throttle device according to the second embodiment.

Fig. 15 is a perspective cross-sectional view of a sensor unit mounted in the throttle device according to the second embodiment, the sensor unit being cut off by a plane passing through the center of an extension passage that leads intake air to a temperature sensor.

Fig. 16 is a cross-sectional view of a sensor unit mounted in the throttle device according to the second embodiment, the sensor unit being cut by a plane passing through the centers of the temperature sensor and the extension passage and the center of the pressure sensor.

Fig. 17 is an exploded perspective view of a housing, a passage member fitted into the housing, and a circuit board to which a temperature sensor and a pressure sensor are connected, in a sensor unit mounted in a throttle valve device according to a second embodiment.

Fig. 18 is a partial cross-sectional view partially showing a region of a communication path (first communication path and second communication path) in which a recess portion in which a temperature sensor and a pressure sensor are arranged so as to face each other communicates with a main path in the throttle device according to the second embodiment.

Fig. 19 is a schematic view showing a main passage, a bypass passage, communication passages (first communication passage and second communication passage), and a sensor unit in the throttle device according to the second embodiment.

Fig. 20 is a cross-sectional view of a sensor unit mounted in the throttle device according to the third embodiment, the sensor unit being cut by a plane passing through the centers of the temperature sensor and the extension passage and the center of the pressure sensor.

Fig. 21 is a partial cross-sectional view partially showing a region of a communication path (first communication path and second communication path) in which a recess portion in which a temperature sensor and a pressure sensor are arranged so as to face each other communicates with a main path in the throttle device according to the third embodiment.

Fig. 22 is a schematic view showing a main passage, a bypass passage, communication passages (first communication passage and second communication passage), and a sensor unit in the throttle device according to the third embodiment.

[ description of symbols ]

10: throttle valve body

12: main passage

14: bypass passage

16: mounting surface

17: communication path

17a: first communication path

17b: second communication path

20: valve rod

30: throttle valve

40: driving unit

50: adjusting valve

U: sensor unit

R: resin sealant

60: shell body

62: junction surface

63: concave part

64: protruding wall

65: annular groove

Sr2: sealing member

70: circuit substrate

80: pressure sensor

90: temperature sensor (lead type sensor)

91: temperature sensing element

92: lead wire

U2: sensor unit

160: shell body

164: protective wall

165: extension passage

M1: passage member

165a: first extension passage

165b: second extension passage

190: temperature sensor (chip type sensor)

U3: sensor unit

260: shell body

265: extension passage

M2: passage member

265a: first extension passage

265b: second extension passage

265b ₁ : straight line passage

265b ₂ : curved passage

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The throttle device of the present invention is a device that is incorporated in the middle of an intake pipe on the downstream side of an air cleaner in an intake system of an engine mounted on a motorcycle.

As shown in fig. 1 to 13, the throttle device of the first embodiment includes: the throttle valve includes a throttle body 10, a valve stem 20 having an axis S, a throttle valve 30, a driving unit 40 for opening and closing the throttle valve 30, an adjusting valve 50, and a sensor unit U.

Here, the sensor unit U includes: a housing 60, a circuit board 70, a pressure sensor 80, and a temperature sensor 90.

The throttle body 10 is formed of a metal material such as aluminum, and includes: an upstream side connecting portion 11a, a downstream side connecting portion 11b, a locking portion 11c, an adjusting screw 11d, a main passage 12, a stem hole 13 through which a stem 20 passes, a bypass passage 14, a housing portion 15 housing an adjusting valve 50, a mounting surface 16 formed on an outer wall, a communication passage 17, and two boss portions 18.

The upstream connecting portion 11a is connected to an intake duct forming an intake system of the engine.

The downstream connecting portion 11b is connected to a joint surface of a cylinder head of an engine forming an intake system of the engine via a seal member Sr 1.

The locking portion 11c is a member for locking one end 42a of the coil spring 42 included in the drive unit 40.

The adjustment screw 11d is a member that abuts against a part of the locking lever 41c of the drum 41 included in the driving unit 40.

The main passage 12 is a member through which intake air directed to a combustion chamber of the engine passes, and is formed in a cylindrical shape extending in the direction of a straight line L around the straight line L perpendicular to the axis S. As shown in fig. 5, the main passage 12 is formed in a conical surface shape in which the passage area increases from the area where the throttle valve 30 is disposed toward the upstream side, that is, in a conical surface shape in which the passage area decreases from the upstream side connecting portion 11a toward the area where the throttle valve 30 is disposed.

As shown in fig. 5, the stem hole 13 is formed as a circular hole through which the stem 20 rotatably passes, and an annular recess 13a into which the lip seal Rs is fitted is formed on the outer side in the axis S direction.

As shown in fig. 6, 7, and 13, the bypass passage 14 is constituted by: the upstream-side passage 14a branches from the main passage 12 upstream of the throttle valve 30; the downstream-side passage 14b merges with the main passage 12 downstream of the throttle valve 30; the communication passage 14c is interposed between the upstream side passage 14a and the downstream side passage 14b, and the passage area is regulated by the regulating valve 50.

That is, the bypass passage 14 is located at an opening 14a located upstream of the throttle valve 30 ₁ The intake air is branched from the main passage 12 and introduced so as to bypass the throttle valve 30, and the intake air is introduced into the opening 14b located downstream of the throttle valve 30 ₁ Where the intake air is led out to the main passage 12.

As shown in fig. 4, 6, and 7, the housing portion 15 is a region in which the valve body 51 of the adjustment valve 50 is housed so that the valve body 51 of the adjustment valve 50 can reciprocate, and a screw hole 15a into which a screw b3 is screwed is provided in an end surface of the housing portion 15, and the screw b3 fastens a pressing member 54 that fixes the electromagnetic actuator 53 of the adjustment valve 50. The housing portion 15 also functions as a communication path that communicates the upstream passage 14a with the downstream passage 14 b.

As shown in fig. 4 and 5, the mounting surface 16 is formed as a plane perpendicular to the axis S so as to mount the sensor unit U.

Further, two screw holes 16a for fastening the sensor unit U with screws b1, and an annular recess 16b into which the fitting portion 61 of the sensor unit U fits are formed in the mounting surface 16, and the communication path 17 is opened.

As shown in fig. 2 and 8, the communication path 17 is constituted by a first communication path 17a and a second communication path 17b which are opened to the mounting surface 16 and communicate with the main path 12, respectively, so that the main path 12 communicates with the recess 63 of the housing 60 constituting the sensor unit U on the downstream side of the throttle valve 30.

By forming the communication passage 17 as two passages (the first communication passage 17a and the second communication passage 17 b) in this manner, the flow of the intake air from the main passage 12 toward the recess 63 via one of the first communication passage 17a and the second communication passage 17b and the flow of the intake air from the recess 63 toward the main passage 12 via the other of the first communication passage 17a and the second communication passage 17b can be positively generated by the pulsation of the intake air, and the scavenging action of the intake air can be obtained. Thereby, stagnation of intake air can be prevented in the recess 63.

The boss portion 18 has a circular hole for passing a screw (not shown) for fastening the throttle body 10 with the sealing member Sr1 interposed therebetween, with respect to a joint surface of the cylinder head of the engine.

As shown in fig. 5, the valve stem 20 is formed of a metal material or the like having a circular cross section and extending in the axis S direction, and includes a slit 21 into which the throttle valve 30 is fitted and two screw holes 22 in a central region, a coupling portion 23 that couples the driving unit 40 is provided on one end side, a disk-shaped member 24 is provided on the other end side, and an annular groove (not shown) that fits a retainer ring W adjacent to the gasket on the inner side than the disk-shaped member 24 is provided.

The coupling portion 23 includes a double-sided wide portion so as to integrally rotatably fit the drum 41 of the driving unit 40.

The disk-shaped member 24 is disposed inside the cylindrical fitting portion 61 of the sensor unit U. Therefore, the present invention can be applied as a member to be detected in a case where a rotational position detection sensor including a hall element or the like is embedded in the bottom wall of the fitting portion 61 of the sensor unit U.

Then, the throttle valve 30 fitted into the slit 21 is fastened by the screw b2 in a state where the valve stem 20 passes through the valve stem hole 13 of the throttle body 10, whereby the throttle valve 30 is held openable and closable. The stem 20 is sealed on the outer side of the stem hole 13 in the axis S direction by a lip seal Rs, and a gasket and a retainer W are attached to the outer peripheral surface so as to cooperate with the drum 41 attached to the coupling portion 23 to restrict movement in the axis S direction.

The throttle valve 30 is formed in a substantially circular plate shape from a metal material or the like, and includes a circular hole 31 through which the screw b2 passes, as shown in fig. 2 and 5.

The throttle valve 30 is disposed so that the valve stem 20 passes through the stem hole 13, and then is fixed to the valve stem 20 by a screw b2 through the slit 21, thereby opening and closing the main passage 12.

The throttle valve 30 opens the main passage 12 to a desired opening degree in accordance with the rotation of the valve stem 20.

As shown in fig. 1, 2, 5, and 7, the driving unit 40 is a member that rotationally drives the valve stem 20 about the axis S, and includes: a roller 41 connected and fixed to the connecting portion 23 of the valve rod 20; the coil spring 42 is disposed between the roller 41 and the throttle body 10 around the valve rod 20.

The drum 41 includes: the locking hole 41a and the locking hole 41b lock the line connected with the throttle handle; the locking lever 41c locks the coil spring 42.

The locking lever 41c is brought into contact with an adjustment screw 11d provided in the throttle body 10 by the rotation urging force of the coil spring 42. Accordingly, the amount of feed of the adjustment screw 11d is appropriately adjusted, and the valve opening of the throttle valve 30 in the stop position is set to a desired position.

As shown in fig. 1, 2 and 7, one end 42a of the coil spring 42 is locked to the locking portion 11c of the throttle body 10, and the other end 42b is locked to the locking lever 41c of the drum 41, and applies a rotational force in the direction in which the throttle valve 30 is closed.

As shown in fig. 3, 4, 6, and 7, the regulator valve 50 includes: a valve body 51; a coil spring 52 for biasing the valve body 51 in the valve opening direction; an electromagnetic actuator 53 that drives the valve body 51 so that the valve body 51 can reciprocate freely in a direction parallel to the axis S; the pressing member 54 fixes the electromagnetic actuator 53 to the throttle body 10.

The regulator valve 50 increases or decreases the passage area of the bypass passage 14 (the communication passage 14 c) in the idling region of the engine, and regulates the flow rate of the intake air flowing through the bypass passage 14.

The sensor unit U is a member attached to the attachment surface 16 of the throttle body 10, and includes a housing 60, a circuit board 70, a pressure sensor 80, and a temperature sensor 90, as shown in fig. 3, 4, and 8 to 12.

The housing 60 is a member molded using a resin material, and includes a fitting portion 61, a joint surface 62, a recess 63, a protruding wall 64 protruding in the recess 63, an annular groove 65, an outer accommodating recess 66, two boss portions 67 through which the screw b1 passes, and a connector 68.

The fitting portion 61 is formed in a cylindrical shape centered on the axis S so as to be fitted into an annular recess 16b formed in the mounting surface 16 of the throttle body 10. The fitting portion 61 is fitted into the annular recess 16b, thereby positioning the sensor unit U and the throttle body 10.

The engagement surface 62 is a member that is tightly engaged with the mounting surface 16 of the throttle body 10, and is formed as a plane perpendicular to the axis S.

As shown in fig. 3, 8, 11, and 12, the concave portion 63 is formed to be recessed from the joint surface 62 in the direction of the axis S and to form a substantially triangular contour. The intake air in the main passage 12 is guided to the recess 63 via the first communication passage 17a or the second communication passage 17 b. An opening 63a is formed in the bottom wall of the recess 63, and the opening 63a faces the end surface (the protective cover 83) of the pressure sensor 80 on the same plane.

As shown in fig. 8, 9, and 11, the protruding wall 64 is formed of a thin wall that protrudes hemispherical from the bottom wall of the recess 63 so as not to protrude outward from the joint surface 62.

Further, a temperature sensing element 91 of the temperature sensor 90 is disposed adjacent to the inside of the protruding wall 64.

The annular groove 65 is formed on the joint surface 62 so as to surround the recess 63 in order to fit the seal member Sr 2.

As shown in fig. 9 to 11, the outer accommodating recess 66 is formed to be recessed from an outer end surface on the opposite side to the joint surface 62, the circuit board 70 is disposed on the inner side thereof, and the resin sealing agent R is filled so as to embed the circuit board 70 from the outer side thereof.

The boss portion 67 includes a circular hole through which a screw b1 that fastens the sensor unit U to the throttle body 10 passes.

The connector 68 is formed to surround terminals electrically connected with the circuit substrate 70, and is connected to an external connector.

The circuit board 70 is a component in which various electronic components and printed wiring are mounted on the surface thereof and a plurality of terminals are electrically connected, and as shown in fig. 9 to 11, leads 82 of the pressure sensor 80 and leads 92 of the temperature sensor 90 are electrically connected.

As shown in fig. 8, 9, 11, and 12, the pressure sensor 80 includes: the semiconductor strain gauge includes a pressure receiving portion 81 such as a diaphragm of a semiconductor strain gauge, a lead 82 extending from the pressure receiving portion 81, and a protective cover 83.

That is, the pressure sensor 80 is arranged such that the lead 82 is electrically connected to the circuit board 70, and the protective cover 83 is exposed on the same plane as the bottom wall of the recess 63 at the position of the opening 63a of the recess 63. In this state, as shown in fig. 8, the pressure sensor 80 is disposed in the vicinity of the first communication path 17a so as to face the recess 63.

The pressure sensor 80 detects the pressure of the intake air guided from the main passage 12 to the concave portion 63 through the communication passage 17 (the first communication passage 17a, the second communication passage 17 b) via the small-diameter hole 83a of the protection cover 83 in a state of facing the concave portion 63 so as not to protrude to the outside from the joint surface 62.

As shown in fig. 8, 10, 11, and 12, the temperature sensor 90 is a lead sensor including a temperature sensing element 91 such as a thermistor, and a lead 92 extending from the temperature sensing element 91.

That is, in the temperature sensor 90, the temperature sensing element 91 is disposed adjacent to the inner side of the protruding wall 64 protruding in the recess 63, and the lead 92 is electrically connected to the circuit board 70. In this state, as shown in fig. 8, the temperature sensor 90 is disposed in the vicinity of the second communication path 17b so as to face the recess 63.

The temperature sensor 90 detects the temperature of the intake air guided from the main passage 12 to the concave portion 63 through the communication passage 17 (the first communication passage 17a, the second communication passage 17 b) via the protruding wall 64 in a state where the concave portion 63 is covered with the protruding wall 64 so as not to protrude to the outside from the joint surface 62.

In this way, since the pressure sensor 80 and the temperature sensor 90 are disposed so as not to protrude from the joint surface 62, the formability of the case 60 can be improved, the sensor unit U can be miniaturized, and interference with external parts and the like can be prevented, and therefore, breakage and the like of the pressure sensor 80 and the temperature sensor 90 can be prevented.

Further, since the pressure receiving portion 81 of the pressure sensor 80 is covered with the protective cover 83 having the small diameter hole 83a, carbon or the like brought in by blowing back of the intake air or the like can be prevented from directly adhering to the pressure receiving portion 81. Thus, the pressure of the intake air can be detected with high accuracy. Similarly, since the temperature sensing element 91 of the temperature sensor 90 is covered with the protruding wall 64, which is a protective wall of a resin material or the like, carbon or the like brought in by blowing back or the like of the intake air can be prevented from directly adhering to the temperature sensing element 91. This allows the temperature of the intake air to be detected with high accuracy.

As described above, since the sensor unit U accommodates the pressure sensor 80 and the temperature sensor 90 so as not to protrude from the joint surface 62, the temperature sensor 90 can be prevented from interfering with external components or the like, and therefore, the temperature sensor 80 can be prevented from being broken, and the size can be reduced. In addition, the form of the throttle body 10 can be simplified and the degree of freedom in assembly to the throttle body 10 can be increased, as compared with the conventional form in which the temperature sensor protrudes from the joint surface and is inserted into the throttle body. Further, the formability of the case 60 is improved, and the cost can be reduced.

Next, an assembling operation of the throttle device having the above-described structure will be described.

First, the throttle body 10, the valve stem 20, the throttle valve 30, the driving unit 40, the regulator valve 50, the sensor unit U, the lip seal Rs, the seal member Sr2, the washer, the retainer W, the screw b1, the screw b2, and the screw b3 are prepared.

The sensor unit U is prepared as a module in which the circuit board 70 to which the pressure sensor 80 and the temperature sensor 90 are connected is embedded in the case 60.

Then, the lip seal Rs is fitted into the annular recess 13a of the throttle body 10, and the stem 20 to which the disk member 24, the gasket, and the retainer ring W are attached is passed through the stem hole 13 from the mounting surface 16 side. Then, the throttle valve 30 is inserted into the slit 21 of the valve stem 20, and is fixed to the valve stem 20 with the screw b 2.

Then, the driving unit 40 is coupled to the coupling portion 23 of the stem 20. Specifically, the coil spring 42 is disposed around the valve stem 20, and the coupling portion 23 of the valve stem 20 is coupled to the drum 41 from the outside of the coil spring 42 and fixed by a nut.

Then, one end 42a of the coil spring 42 is locked to the locking portion 11c of the throttle body 10, and the other end 42b of the coil spring 42 is locked to the locking lever 41c of the drum 41.

The feeding amount of the adjustment screw 11d abutting against the locking lever 41c is appropriately adjusted, and the rotational angle position of the drum 41 is set to a predetermined angle. Furthermore, the adjustment may also be performed after the assembly of all the parts is completed.

Then, the adjustment valve 50 is mounted to the housing 15 of the throttle body 10. That is, the coil spring 52 is inserted into the housing 15, and then the valve body 51 is inserted into the housing 15 in a state of being coupled to the electromagnetic actuator 53. Then, the pressing member 54 is engaged with the end surface of the housing portion 15 and fastened to the throttle body 10 with the screw b3 so as to fix the electromagnetic actuator 53.

Then, the sensor unit U is joined to the mounting surface 16 of the throttle body 10 and fastened with the screw b 1. That is, in a state in which the seal member Sr2 is fitted into the annular groove 65, the fitting portion 61 of the housing 60 is fitted into the annular recess 16b of the throttle body 10, and the joint surface 62 is joined to the mounting surface 16. Then, the housing 60 is fastened to the throttle body 10 with the screw b1, and the sensor unit U is fixed to the throttle body 10.

Accordingly, the main passage 12 communicates with the recess 63 via the communication passage 17 (the first communication passage 17a and the second communication passage 17 b) opened to the mounting surface 16 on the downstream side of the throttle valve 30.

Here, since the pressure sensor 80 and the temperature sensor 90 are arranged to detect the pressure and the temperature of the intake air guided into the recess 63 formed so as to be recessed from the joint surface 62 of the housing 60, that is, are arranged so as not to protrude from the joint surface 62, it is not necessary to pay attention so that the pressure sensor 80 and the temperature sensor 90 do not interfere with other components, and the sensor unit U can be easily attached to the throttle body 10.

The assembly work of the throttle device is not limited to the above method, and may be assembled by other methods.

Next, an operation of the throttle device in a state mounted on the engine will be described.

First, when the engine is in the idle operation region, the throttle valve 30 is in a state in which the main passage 12 is closed, and the intake air flowing through the main passage 12 flows through the bypass passage 14 so as to bypass the throttle valve 30 and flows out again to the main passage 12 on the downstream side.

In this state, the regulator valve 50 regulates the passage area of the bypass passage 14 (the communication passage 14 c) to maintain the idling operation of the engine in a stable state.

On the other hand, when the engine is in an operation region other than the idle operation region, the throttle valve 30 is in a predetermined opening range, and the main passage 12 is opened.

Therefore, the intake air flowing in the main passage 12 does not pass through the bypass passage 14, but flows in the main passage 12 and is sucked into the engine. At this time, the adjustment valve 50 is not used to adjust the amount of intake air flowing in the bypass passage 14.

As shown in fig. 13, the intake air flowing through the main passage 12 is guided into the recess 63 via the first communication passage 17a or the second communication passage 17 b. In this state, the pressure sensor 80 detects the pressure of the intake air that is guided to the recess 63. In addition, the temperature sensor 90 detects the temperature of the intake air guided to the recess 63.

In this way, the pressure of the intake air is detected by the pressure sensor 80, the temperature of the intake air is detected by the temperature sensor 90, and the information detected by each is taken in as control information of the control means, so that the engine is appropriately controlled.

The throttle device of the first embodiment includes: the throttle body 10 includes a main passage 12 through which intake air passes, a mounting surface 16 formed on an outer wall, and a communication passage 17 that opens to the mounting surface 16 and communicates with the main passage 12; a throttle valve 30 that opens and closes the main passage 12; and a sensor unit U that is joined to the mounting surface 16, and includes: a housing 60 having a joint surface 62 joined to the mounting surface 16 and a recess 63 recessed from the joint surface 62 and communicating with the communication path 17; a circuit board 70 embedded in the case 60; a pressure sensor 80 electrically connected to the circuit board 70 and detecting a pressure of the intake air guided to the recess 63; and a temperature sensor 90 electrically connected to the circuit board 70 and detecting the temperature of the intake air guided to the recess 63.

Accordingly, the sensor unit U accommodates the pressure sensor 80 and the temperature sensor 90 so as not to protrude from the joint surface 62, and therefore, in particular, interference between the temperature sensor 90 and external components and the like can be prevented, breakage thereof can be prevented, and miniaturization can be achieved. In addition, the degree of freedom in assembling the sensor unit U to the throttle body 10 is also improved, and the formability of the case 60 is improved, so that the cost can be reduced.

The communication passage 17 is formed so as to communicate the main passage 12 with the recess 63 on the downstream side of the throttle valve 30, and is formed so as to include a first communication passage 17a and a second communication passage 17b that communicate the recess 63 with the main passage 12, respectively.

Accordingly, the intake air can be positively guided to the recess 63 by the pulsation of the intake air, and scavenging of the intake air can be performed, so that the pressure and temperature of the intake air can be detected with high accuracy.

The housing 60 includes an annular groove 65 formed in the joint surface 62 so as to surround the recess 63, and a seal member Sr2 that is tightly joined to the mounting surface 16 of the throttle body 10 is disposed in the annular groove 65.

Accordingly, since the periphery of the one concave portion 63 to which the pressure sensor 80 and the temperature sensor 90 face may be sealed by the one sealing member Sr2, the number of parts can be reduced, the cost can be reduced, and the housing 60 can be simplified as compared with a configuration in which the pressure sensor and the temperature sensor are disposed so as to face different concave portions and sealed by different sealing members.

The pressure sensor 80 is disposed near the first communication path 17a so as to face the recess 63, and the temperature sensor 90 is disposed near the second communication path 17b so as to face the recess 63.

Accordingly, as indicated by an arrow (solid line) in fig. 13, the intake air by the main passage 12 is guided to the recess 63 via the first communication passage 17a and the intake air in the recess 63 is returned to the scavenging action of the main passage 12 via the second communication passage 17b, or as indicated by an arrow (broken line) in fig. 13, the intake air by the main passage 12 is guided to the recess 63 via the second communication passage 17b and the intake air in the recess 63 is returned to the reverse scavenging action of the main passage 12 via the first communication passage 17a, whereby the intake air of the recess 63 can be detected without stagnation of the pressure and the temperature of the intake air.

Further, since the temperature sensor 90 is a lead sensor connected to the circuit board 70 via the lead 92, the temperature of the intake air can be detected in the area near the recess 63. In particular, since the case 60 includes the protruding wall 64 protruding in the recess 63, and the temperature sensor 90 is disposed so as to be covered with the protruding wall 64, it is possible to prevent carbon or the like brought in by blowing back or the like of the intake air from directly adhering to the temperature sensing element 91. This allows the temperature of the intake air to be detected with high accuracy.

Fig. 14 to 19 are views showing a throttle device according to a second embodiment of the present invention, which is the same as the first embodiment except that the sensor unit U of the throttle device according to the first embodiment is changed to the sensor unit U2. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

The throttle device of the second embodiment includes: the throttle valve includes a throttle body 10, a valve stem 20 having an axis S, a throttle valve 30, a driving unit 40 for opening and closing the throttle valve 30, an adjusting valve 50, and a sensor unit U2.

Here, the sensor unit U2 includes: a housing 160, a circuit board 70, a pressure sensor 80, and a temperature sensor 190.

The case 160 is a member molded using a resin material, and includes: the fitting portion 61, the engagement surface 62, the recess 63, the annular groove 65, the outer accommodating recess 66, two boss portions 67 through which the screw b1 passes, the connector 68, the protection wall 164, the extension passage 165, and the tubular passage member M1.

As shown in fig. 15 and 16, the protective wall 164 is formed in a thin plate shape at a position deeper than the recess 63 from the joint surface 62, and is interposed between the temperature sensor 190 surface-mounted on the circuit board 70 and the extension path 165 so as to cover the temperature sensor 190.

As shown in fig. 14, 16, and 18, the extension passage 165 is formed to extend from the recess 63 to the protection wall 164 at a position away from the small-diameter hole 83a facing the recess 63 and in the vicinity of the second communication passage 17 b.

The passage member M1 is fitted so as to occupy a part of the extension passage 165, and divides the extension passage 165 into a first extension passage 165a and a second extension passage 165b.

That is, the extension passage 165 is formed to include a first extension passage 165a defined around the passage member M1, and a second extension passage 165b defined by the passage member M1.

Here, one end opening of the passage member M1 communicates with the second communication passage 17b, and the other end opening of the passage member M1 faces the protection wall 164 with the gap area Ga therebetween.

As shown in fig. 17, the temperature sensor 190 is a chip-type sensor surface-mounted on the circuit board 70, and is, for example, a chip-type negative temperature coefficient (Negative Temperature Coefficient, NTC) thermistor or the like.

Thus, by using a chip-type sensor as the temperature sensor, miniaturization and cost reduction can be achieved.

In this configuration, the extension passage 165 is formed as two passages, i.e., the first extension passage 165a and the second extension passage 165b, and thus, as indicated by arrows (broken lines) in fig. 19, a scavenging action is obtained in which the intake air of the main passage 12 is guided to the gap region Ga facing the protection wall 164 via the second communication passage 17b and the second extension passage 165b, and the scavenging action is returned from the gap region Ga to the main passage 12 via the first extension passage 165a, the recess 63, and the first communication passage 17 a. As indicated by the arrow (solid line) in fig. 19, the scavenging action is obtained in which the intake air of the main passage 12 is guided to the gap region Ga facing the protection wall 164 via the first communication passage 17a and the recess 63 and the first extension passage 165a, and the reverse scavenging action is returned from the gap region Ga to the main passage 12 via the second extension passage 165b and the second communication passage 17 b.

In this way, the intake air of the main passage 12 can be guided to the gap region Ga near the protection wall 164. Thus, the pressure of the intake air can be detected with high accuracy by the pressure sensor 80, and the temperature of the intake air can be detected with high accuracy by the temperature sensor 190.

In addition, by using the passage member M1 defining the second extension passage 165b, the formability of the housing 160 is improved.

According to the throttle device of the second embodiment, the formability, the cost, the degree of freedom in assembly, the size, and the like can be improved as in the first embodiment, and the pressure and the temperature of intake air can be detected with high accuracy.

Fig. 20 to 22 are views showing a throttle device according to a third embodiment of the present invention, which is the same as the first and second embodiments except that the sensor unit U2 of the throttle device according to the second embodiment is changed to the sensor unit U3. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

The throttle device of the third embodiment includes: the throttle valve includes a throttle body 10, a valve stem 20 having an axis S, a throttle valve 30, a driving unit 40 for opening and closing the throttle valve 30, an adjusting valve 50, and a sensor unit U3.

Here, the sensor unit U3 includes: a housing 260, a circuit board 70, a pressure sensor 80, and a temperature sensor 190.

The housing 260 is a member molded using a resin material, and includes: the fitting portion 61, the engagement surface 62, the recess 63, the annular groove 65, the outer accommodating recess 66, two boss portions 67 through which the screw b1 passes, the connector 68, the protection wall 164, the extension passage 265, and the tubular passage member M2.

As shown in fig. 20 and 21, the extension passage 265 is formed at a position distant from the small-diameter hole 83a facing the recess 63 and near the second communication passage 17b so as to extend from the recess 63 to the protection wall 164.

The passage member M2 is fitted so as to occupy a part of the extension passage 265, and divides the extension passage 265 into a first extension passage 265a and a second extension passage 265b.

That is, the extension passage 265 is formed to include a first extension passage 265a defined around the passage member M2, and a second extension passage 265b defined by the passage member M2.

Also, the second extended passage 265b is formed to include a straight passage 265b facing the protection wall 164 ₁ And between the straight line passage 265b ₁ A curved passage 265b with the second communication passage 17b ₂ 。

Here, one end opening of the passage member M2 (curved passage 265b ₂ ) Communicates with the second communication passage 17b, and the other end opening of the passage member M2 (the linear passage 265b ₁ ) Facing the protection wall 164 with a gap area Ga therebetween.

In this configuration, the extension passage 265 is formed as two passages, i.e., the first extension passage 265a and the second extension passage 265b, whereby, as indicated by arrows (broken lines) in fig. 22, a scavenging action is obtained in which the intake air of the main passage 12 is guided to the gap region Ga facing the protection wall 164 via the second communication passage 17b and the second extension passage 265b, and is returned from the gap region Ga to the main passage 12 via the first extension passage 265a and the recess 63 and the first communication passage 17 a. As indicated by the arrow (solid line) in fig. 22, the scavenging action is obtained in which the intake air of the main passage 12 is guided to the gap region Ga facing the protection wall 164 via the first communication passage 17a and the recess 63 and the first extension passage 265a, and the reverse scavenging action of the main passage 12 is returned from the gap region Ga via the second extension passage 265b and the second communication passage 17 b.

Here, in particular, since the second extension passage 265b is formed to include a curved passage 265b ₂ Therefore, when carbon or the like is mixed in the intake air introduced from the main passage 12 through the second communication passage 17b, the curved passage 265b can be used ₂ Carbon or the like is trapped and prevented from entering the gap region Ga. On the other hand, when carbon or the like is mixed in the intake air introduced from the main passage 12 through the first communication passage 17a, the passage leading from the concave portion 63 to the first extension passage 265a forms a curved passage, so that carbon or the like can be captured in the region of the concave portion 63 and prevented from entering the gap region Ga.

In addition, by using the passage member M2 defining the second extension passage 265b, the formability of the housing 260 is improved as described above.

According to the throttle device of the third embodiment, the improvement of formability, the reduction of cost, the improvement of freedom in assembly, the miniaturization, and the like can be achieved as in the first and second embodiments, and the pressure and temperature of intake air can be detected with high accuracy.

In the above embodiment, the sensor units U, U2, U3 including the pressure sensor 80, the temperature sensor 90, and the temperature sensor 190 are shown as the sensor units, but the present invention is not limited thereto, and a position detection sensor that detects the rotation angle of the valve rod 20 may be included.

In this case, as the position detection sensor, a noncontact magnetic sensor including a hall element or the like embedded in the inner region of the fitting portion 61 may be used.

In the above embodiment, the structure in which the passage member M1 and the passage member M2 are inserted into one of the extension passages 165 and 265 to define two passages (the first extension passage 165a, the first extension passage 265a, the second extension passage 165b, and the second extension passage 265 b) is shown as the extension passage extending from the recess 63 to the protection wall 164, but the present invention is not limited thereto, and the passage member M1 and the passage member M2 may be omitted as long as they are allowed in the production of the housing, and the two passages (the first extension passage and the second extension passage) may be directly formed in the housing.

In the above embodiment, the structure in which the opening at one end of the passage member M1 or the passage member M2 communicates with the second communication passage 17b is shown, but the present invention is not limited to this, and the structure may be such that the opening communicates with the recess 63 in the vicinity of the second communication passage 17 b.

Specifically, as a configuration in which the extension passage includes the first extension passage and the second extension passage, the first extension passage defined around the passage member M1 and the passage member M2 may be configured in the same manner as described above, and the following configuration may be adopted: an opening of the second extension passage defined by the passage member M1 and the passage member M2 is not directly communicated with the second communication passage 17b, but is opened in the recess 63, and is communicated with the second communication passage 17b via the recess 63.

In the above embodiment, the structure including two passages (the first extension passage 165a, the first extension passage 265a, the second extension passage 165b, and the second extension passage 265 b) is shown as the extension passage extending from the recess 63 to the protection wall 164, but the present invention is not limited thereto. For example, in the case where the intake air can be easily introduced into the vicinity of the protection wall 164 through one extension passage, one extension passage may be used as the extension passage extending from the recess 63 to the protection wall 164.

In the above embodiment, the communication passage 17 including the first communication passage 17a and the second communication passage 17b is shown as the communication passage that opens to the mounting surface 16 and communicates with the main passage 12, but the present invention is not limited thereto, and one communication passage may be used as long as the scavenging action of guiding the intake air of the main passage 12 to the concave portion 63 and returning the intake air in the concave portion 63 to the main passage 12 can be easily obtained.

As described above, the throttle device according to the present invention can be used for a motorcycle or the like, and can be effectively used for other vehicles, since it can be used for detecting the temperature and pressure of intake air with high accuracy while improving the formability, reducing the cost, improving the degree of freedom in assembly, reducing the size, and the like.

Claims

1. A throttle device, characterized by comprising:

a throttle body having a main passage through which intake air passes, a mounting surface formed on an outer wall, and a communication passage that opens at the mounting surface and communicates with the main passage;

a throttle valve for opening and closing the main passage; and

a sensor unit coupled to the mounting surface,

the sensor unit includes: a housing having a joint surface joined to the mounting surface, and a recess recessed from the joint surface and communicating with the communication path; a circuit board embedded in the housing; a pressure sensor electrically connected to the circuit board and detecting a pressure of the intake air guided to the recess; and a temperature sensor electrically connected to the circuit board and detecting a temperature of the intake air guided to the recess.

2. The throttle device according to claim 1, wherein the communication passage communicates the recess with the main passage at a downstream side of the throttle valve.

3. A throttle device as defined in claim 2, wherein,

the housing includes an annular groove formed in the joint surface so as to surround the periphery of the recess,

A sealing member is disposed in the annular groove and is in close contact with the throttle body mounting surface.

4. A throttle device as defined in claim 3, including:

a bypass passage branching from the main passage, introducing intake air, bypassing the throttle valve, and introducing intake air to the main passage; and

and an adjustment valve for adjusting the passage area of the bypass passage.

5. A throttle device according to any one of claims 1 to 4, characterized in that,

the communication path includes a first communication path and a second communication path that communicate the concave portion with the main path, respectively.

6. A throttle device as defined in claim 5, wherein,

the pressure sensor is disposed in the vicinity of the first communication path so as to face the recess,

the temperature sensor is disposed in the vicinity of the second communication path so as to face the recess.

7. A throttle device as defined in claim 5, wherein,

the temperature sensor is a lead sensor connected to the circuit board via a lead.

8. A throttle device as defined in claim 7, wherein,

the housing includes a protruding wall protruding within the recess,

The temperature sensor is covered by the protruding wall.

9. A throttle device as defined in claim 5, wherein,

the temperature sensor is a chip-type sensor surface-mounted to the circuit substrate.

10. A throttle device as defined in claim 9, wherein,

the housing includes a protection wall formed at a position deeper than the recess from the engagement surface, and an extension passage extending from the recess to the protection wall,

the temperature sensor is covered by the protective wall.

11. A throttle device as defined in claim 10, wherein,

the elongate passage includes a first elongate passage and a second elongate passage.

12. A throttle apparatus as defined in claim 11, including:

and a passage member fitted to the housing to define the second extension passage.

13. A throttle device as defined in claim 11, wherein,

the first elongate passage communicates with the recess,

the second extension passage communicates with the second communication passage.

14. A throttle device as defined in claim 13, wherein,

The second extension passage includes a straight passage facing the protection wall, and a curved passage interposed between the straight passage and the second communication passage.

15. A throttle apparatus as defined in claim 14, including: