WO2021255990A1

WO2021255990A1 - Electrically controlled throttle device

Info

Publication number: WO2021255990A1
Application number: PCT/JP2021/004274
Authority: WO
Inventors: 健治臼井; 秀行山口; 拓也田中
Original assignee: 日立Astemo株式会社
Priority date: 2020-06-16
Filing date: 2021-02-05
Publication date: 2021-12-23
Also published as: JPWO2021255990A1; CN115667687A

Abstract

The purpose of the present invention is to simplify the electrical connection between a brushless motor and a drive circuit board.　This electrically controlled throttle device comprises a body 1 in which a throttle valve 5 is accommodated, a plastic gear cover 14 that is connected to the body 1 and that forms an accommodation space for gears 8, 12, 13 together with the body 1, a brushless motor 200 provided on the outer-wall side of the gear cover 14, an inverter circuit board 18 provided to the inner-wall side of the gear cover 14, and a bearing 31 that supports a rotating shaft 29 of the brushless motor 200. The gear cover 14 has a bearing-securing part 14D that is provided between the brushless motor 200 and the inverter circuit board and that secures the bearing 31. In the bearing-securing part 14D, there are formed a plurality of through-holes 14C for allowing passage of a plurality of coil-leading wires 26A led out from a drive coil 26 of the brushless motor 200.

Description

Electronic throttle device

The present invention relates to an electronically controlled throttle device.

As a background technique in this technical field, the throttle device described in Japanese Patent Application Laid-Open No. 2007-278275 (Patent Document 1) is known. As described in paragraph 0023 of Patent Document 1, this throttle device is composed of a throttle body provided with a throttle valve and a cover module provided with a motor or the like, and the cover module is attached to the throttle body. The main body of the cover module is made of synthetic resin, and a motor, a drive circuit, a TPS (opening detection device), and the like are arranged on the main body. Further, paragraph 0027 of Patent Document 1 describes a configuration in which the motor is composed of a brushless motor and power is supplied to a drive coil wound around a stator core of the brushless motor via a conductive plate.

Japanese Unexamined Patent Publication No. 2007-278275

In the throttle device of Patent Document 1, a brushless motor is used as the motor, and the drive circuit of the brushless motor is integrated in the throttle body. Compared to DC motors with brushes, brushless motors improve EMC (Electromagnetic Compatibility) performance and durability of in-vehicle parts. Hereinafter, a throttle device in which a drive circuit is integrated in a throttle body will be referred to as an electronically controlled throttle device and will be described.

Since the electronically controlled throttle device is mounted on the engine, vibration resistance of the motor winding (drive coil of Patent Document 1) is required. Further, in the brushless motor, it is necessary to pull out a total of three motor windings of the UVW 3-phase wire from the motor and connect them to the drive circuit board provided in the electronically controlled throttle device. That is, a brushless motor requires more windings to be routed over a longer distance than a brushed DC motor. Therefore, in the brushless motor, the wiring of the motor winding becomes complicated, and the vibration resistance tends to decrease. In a configuration in which a metal conductive plate inserted into a resin cover module body is electrically connected as in the electronically controlled throttle device of Patent Document 1, the vibration resistance of the motor winding can be improved. Therefore, it is necessary to connect the motor winding and the conductive plate and the conductive plate and the drive circuit board, which causes a problem that the number of connection points increases and the structure becomes complicated.

An object of the present invention is to simplify the electrical connection between the brushless motor and the drive circuit board.

In order to achieve the above object, the electronically controlled throttle device of the present invention includes a body for accommodating a throttle valve and a resin gear cover connected to the body and forming a gear accommodating space between the body. A brushless motor provided on the outer wall side of the gear cover and rotating the gear, an inverter circuit board provided on the inner wall side of the gear cover and controlling the drive of the brushless motor, and a rotation shaft of the brushless motor. The gear cover is provided between the brushless motor and the inverter circuit board and has a bearing fixing portion for fixing the bearing, and the bearing fixing portion is of the brushless motor. An electronically controlled throttle device in which a plurality of through holes are formed for passing a plurality of coil leader wires drawn from a drive coil.

According to the present invention, the wiring between the brushless motor and the drive circuit board can be simplified.

Issues, configurations and effects other than those mentioned above will be clarified by the explanation of the following examples.

It is sectional drawing of the electronically controlled throttle apparatus 500 which concerns on Example 1 of this invention. It is sectional drawing of the cover module 100 which concerns on Example 1 of this invention. It is an exploded perspective view of the cover module 100 which concerns on Example 1 of this invention. It is a top view (inner wall side) of the gear cover 14 which concerns on Example 1 of this invention. It is a perspective view (outer wall side) of the gear cover 15 which concerns on Example 1 of this invention. It is an enlarged sectional view of the motor 200 and the motor gear assembly 201 which concerns on Example 1 of this invention. It is an exploded perspective view of the cover module 100 which concerns on Example 2 of this invention. It is an exploded perspective view of the cover module 100 which concerns on Example 3 of this invention.

Hereinafter, embodiments of the electronically controlled throttle device 500 according to the present invention will be described with reference to the drawings. In the embodiment of the present invention, the electronically controlled throttle device 500 electrically controls the intake air amount of the vehicle-mounted engine. The electronically controlled throttle device 500 can also be applied to a negative pressure control throttle valve for controlling the hydrogen concentration and the amount of air in the fuel cell.

[Example 1] FIG. 1 is a cross-sectional view of an electronically controlled throttle device 500 according to a first embodiment of the present invention.

As shown in FIG. 1, the body 1 has an intake flow path 2 having a circular cross section. The throttle shaft 3 is arranged so as to penetrate the intake flow path 2. Further, the throttle shaft 3 is supported by two bearings 4 with the intake flow path interposed therebetween. The two bearings 4 are press-fitted into holes provided in the body 1. Thus, the throttle shaft 3 is rotatably supported with respect to the body 1.

The throttle valve 5 is arranged in the intake flow path 2 of the body 1 and is composed of a metal disk. The throttle valve 5 is fixed to the throttle shaft 3 by two screws 6. The throttle valve 5 opens and closes the intake flow path 2 with the rotation of the throttle shaft 3 in the intake flow path 2. When the throttle shaft 3 rotates, the throttle valve 5 rotates, and as a result, the opening area of the intake flow path 2 changes and the intake air flow rate to the engine is controlled.

A protruding portion 1A for attaching the cover module 100 is provided on the surface of the body 1 on the side of the gear storage portion.

FIG. 2 is a cross-sectional view of the cover module 100 according to the first embodiment of the present invention.
As shown in FIG. 2, the cover module 100 includes a driving motor 200 on the outer wall side of the gear cover 14, and an inverter circuit board 18 for driving the motor 200 and a throttle valve on the inner wall side of the gear cover 14. It is provided with a throttle sensor 20 for detecting the opening degree of 5. The inverter circuit board 18 is a circuit board having an inverter circuit for driving the motor 200.

The gear cover 14 is a resin molded product, and the metal connector terminal 15 and the metal insert nut 16 are integrally molded. Further, the shape of the connector 17 is integrally formed with the gear cover 14 on the outer wall side of the gear cover 14, and one end of the connector terminal 15 projects inside the shape of the connector 17 (FIG. 6), and the ECU (Engine) is formed. The connector of the wiring from Control Unit) etc. is fitted.

The motor case 23 of the motor 200 is made of a resin molded product or metallic, and a flange portion 23A for attaching to the gear cover 14 is formed on the peripheral edge of the opening. Further, the flange portion 23A is provided with a plurality of through holes 23B for passing a plurality of screws 34 for attaching the motor case 23 to the gear cover 14. An annular recess 33A is formed in the flange portion 23A, and the motor case packing 33 is held in the annular recess 33A.

A metal sleeve 25 made of metal is arranged on the inner wall of the motor case 23, and a stator core 27 around which a drive coil 26 is wound is arranged inside the metal sleeve 25. Inside the stator core 27, a rotor 30 composed of a motor shaft 29, which is a rotation shaft of the motor 200, and a rotor magnet 28 is arranged. The motor shaft 29 is supported by a bearing 24 and a bearing 31. The rotor magnet 28 is composed of a permanent magnet fixed to the outer periphery of the motor shaft 29. The rotor 30 is rotatably supported by

bearings

24 and 31.
The motor 200 has an inner rotor type brushless motor configuration.

The outer ring of the bearing 24 that supports the opposite gear side of the motor shaft 29 is press-fitted into the inside of the motor case 23, and the motor shaft 29 is press-fitted into the inner ring of the bearing 24.
On the other hand, on the motor gear 13 side of the rotor magnet 28 of the rotor 30, the outer ring of the bearing 31 that supports the motor gear 13 side of the motor shaft 29 is press-fitted into the inner diameter of the bearing fixing portion 14D of the gear cover 14, and the motor shaft 29 is a bearing. It is press-fitted into the inner ring of 31.

A sensor magnet 32 for detecting the rotation of the motor 200 is press-fitted to the motor gear 13 side of the bearing 31 of the motor shaft 29, and the motor gear 13 is press-fitted to the tip of the motor shaft 29. The sensor magnet 32 is arranged together with the bearing 31 on the radial inside (inside the inner diameter) of the bearing fixing portion 14D. As a result, the positional relationship between the sensor magnet 32 and the inverter circuit board 18 can be made appropriate, and waste in the arrangement space of the sensor magnet 32 can be eliminated.

The wire diameter of the drive coil 26 of the motor 200 is as thin as about 0.2 mm to about 0.3 mm in diameter. Therefore, it is difficult to resin-mold the coil wire as it is. Further, since the drive coil 26 has a small wire diameter, it is easily shaken by the vibration of the engine, and there is a problem that the vibration resistance is low as it is.

The plurality of coil wires 26A drawn from the drive coil 26 of the motor 200 are fused to the plurality of coil wire connection portions 18A on the inverter circuit board 18 through the plurality of through holes 14C provided in the gear cover 14. It is electrically connected by a method such as soldering or welding. The coil wire 26A is pulled out from the drive coil 26 and is inserted into the through hole 14C without interposing a component (relay member) such as a bus bar or a conductive plate, and is inserted into the inner wall side of the gear cover 14, that is, the side of the inverter circuit board 18. Is pulled out to. The coil wire 26A directly inserted through the through hole 14C is directly connected to the coil connection portion 18A on the inverter circuit board 18. With this configuration, the number of parts can be reduced and the number of electrical connection points can be reduced.

The coil wire 26A is a portion drawn out from the drive coil (winding portion) 26, and three coil wires 26A are drawn out from the three-phase drive coil (winding portion) 26. The coil wire 26A is composed of one wire rod continuous from the drive coil (winding portion) 26. The coil wire 26A may be referred to as a coil leader wire.

A plurality of through holes 14C corresponding to the three phases (U, V, W) of the drive coil 26 of the motor 200 are provided. Since the diameter of the through hole 14C may be sufficient for one coil wire 26A to pass through, it is not necessary to provide a large hole for passing the coil wire 26A in the gear cover 14. Therefore, it is possible to prevent the strength of the gear cover 14 from being lowered.

When the drive coil 26 treats the three-phase (U, V, W) drive coil as a separate drive coil, it can be considered that there are a plurality of (three) drive coils, and the three-phase (U, V, W) drive coil 26 can be considered to exist. When the drive coils of V, W) are collectively treated as a drive coil, they can be regarded as one drive coil.

Further, since the through hole 14C holds the coil wire 26A at its inner diameter, it prevents the coil wire 26A from being shaken by vibration and improves the vibration resistance of the coil wire 26A. Further, the vibration resistance can be further improved by injecting an adhesive or the like into the gap between the coil wire 26A and the through hole 14C. Further, vibration may be prevented by passing a cylindrical sleeve made of an elastic member such as rubber between the coil wire 26A and the through hole 14C. On the other hand, the motor case 23 is fixed to the gear cover 14 by screwing a plurality of screws 34 into the insert nut 16 integrally embedded in the gear cover 14.

When an adhesive or the like is injected into the gap between the coil wire 26A and the through hole 14C, a substance different from the resin material of the gear cover 14 is filled around the coil wire 26A of the through hole 14C.

As shown in FIG. 1, the motor shaft 29, which is the rotation axis of the motor 200, is arranged in parallel with the throttle shaft 3. Further, the motor 200 constitutes a two-stage reduction mechanism by the motor gear 13, the intermediate gear 12, and the throttle gear 8, whereby the torque generated by the motor 200 is transmitted to the throttle shaft 3 fastened to the throttle gear 8.

The throttle sensor rotor 10 is press-fitted into the tip of the throttle shaft 3. A throttle sensor 20 fixed to the gear cover 14 is arranged at the position of the gear cover 14 facing the throttle sensor rotor 10, and the throttle sensor 20 rotates the throttle sensor rotor 10, that is, the rotation angle of the throttle valve 5. Is detected, the opening degree information of the throttle valve 5 is transmitted to the ECU.

One end of the return spring 7 is locked to a spring hook locking portion (not shown) of the body 1, and the other end is locked to a locking portion (not shown) provided on the throttle gear 8. , A rotational torque in the valve opening direction is applied to the throttle gear 8. A stopper (not shown) formed at a fixed angle is provided on the gear storage portion side of the body 1, and by contacting the end of the throttle gear 8, the throttle gear 8 opens in a certain angle or more. It is designed not to rotate. As a result, when no current is supplied to the motor 200, the throttle valve 5 returns to a predetermined default angle. Note that FIG. 1 illustrates an electronically controlled throttle device for a diesel engine, and the throttle valve 5 opens at an angle substantially perpendicular to the cross section of the intake flow path 2.

A thread groove is partially engraved on the outer circumference on the tip side of the throttle shaft 3, which is screwed with the nut 9 to fix the throttle gear 8 to the throttle shaft 3.

The gear shaft 11 is press-fitted and fixed in the hole 1B provided in the body 1 to rotatably support the intermediate gear 12.

In the cover module 100, the protruding portion 1A of the body 1 and the opening edge portion 14A of the gear cover 14 are in contact with each other, and the skirt portion 14B of the gear cover 14 and the protruding portion 1A of the body 1 are fitted to each other to fit the cover module 100. Positioning with respect to the body 1 of 100 is performed. The opening edge portion 14A of the gear cover 14 is formed with a recess 22A forming an annular shape along the opening edge portion 14A, and the gear cover packing 22 is held in the recess 22A.

The method of positioning the cover module 100 is not limited to the method described here, and various methods can be applied. Various methods can be applied to the method of fixing the cover module 100 to the body 1, and a method of fixing with a plurality of metal clips, a method of fixing with a plurality of screws, and the like are generally known. In this embodiment, any one of these methods shall be applied.

In this embodiment, the brushless motor type electronically controlled throttle device 500 is realized by the above-described configuration.

Next, a method of manufacturing the cover module 100 of the electronically controlled throttle device 500 will be described.

A method of manufacturing a product in which the motor gear 13 is press-fitted into the motor 200 (hereinafter, motor / gear assembly 201) shown in FIG. 2 will be described.

First, the bearing 24 is press-fitted into the motor case 23 made of metal or resin. Next, the metal sleeve 25 and the stator core 27 around which the drive coil 26 is wound are press-fitted into the motor case 23. This assembly is referred to as assembly A.

On the other hand, in the rotor 30, the bearing 31, the sensor magnet 32, and the motor gear 13 are press-fitted and fixed to the motor shaft 29 in this order. This assembly is referred to as assembly B. The assembly B is inserted into the assembly A, and the end portion of the motor shaft 29 of the assembly B is press-fitted into the inner ring of the bearing 24 of the assembly A. With the above, the motor / gear assembly 201 in which the motor gear 13 is press-fitted and fixed to the motor 200 is completed as a part of the electronically controlled throttle device 500.

Next, it will be described with reference to FIGS. 3 to 5. FIG. 3 is an exploded perspective view of the cover module 100 according to the first embodiment of the present invention. FIG. 4 is a plan view (inner wall side) of the gear cover 14 according to the first embodiment of the present invention. FIG. 5 is a perspective view (outer wall side) of the gear cover 15 according to the first embodiment of the present invention.

As shown in FIG. 3, the inverter circuit board 18 to which the lead terminal 21 is welded in advance and the throttle sensor 20 to which the lead terminal 21 is welded are connected to the through holes 18C and 20B provided in the respective boards 18 and 20A and the gear cover. The pins (protruding portions) 14x and 14y formed on the inner wall of the 14 are fixed to the gear cover 14 by thermal caulking. Alternatively, the respective substrates 18 and 20A may be fixed to the gear cover 14 with an adhesive.

Next, in FIGS. 3 and 4, a lead terminal welded to the inverter circuit board 18 and the throttle sensor 20 to the welding protrusion 15A provided at the end of the connector terminal 15 opposite to the connector 17 side. One end of 21 is resistance welded to electrically connect each lead terminal 21 and the connector terminal 15.

In these operations, in the electronically controlled throttle device 500 of the present embodiment, the inverter circuit board 18 and the throttle sensor 20 are arranged in a plane on the inner wall of the gear cover 14, and the welded portion is one toward the inner wall side of the gear cover 14. Since the arrangement is such that work can be performed from the direction, it is possible to fix the inverter circuit board 18 and the throttle sensor 20 to the gear cover 14 and to electrically connect all the lead terminals 21 by welding in a series of steps. Is. Therefore, in the case of this embodiment, when constructing the production equipment, it is easy to construct the equipment as an automated equipment for executing a series of processes. The product manufactured by this process is a partial assembly of the gear cover 14 and the substrates 18 and 20A (hereinafter referred to as the gear cover / Kiban assembly 101).

Next, the motor / gear assembly 201 is assembled to the gear cover / kiban assembly 101 to manufacture the cover module 100. At this time, in the same direction as shown in FIG. 2, the gear cover Kibanmi 101 is fixed so as to be located on the lower side with respect to the gear cover 14, and the motor / gear assembly 201 is fixed with respect to the gear cover 14 from above. It is good to assemble. At the time of assembly, first, the coil wire 26A hanging from the motor / gear assembly 201 is inserted into a plurality of through holes 14C provided in the bearing fixing portion 14D (FIG. 5) of the gear cover 14. In order to facilitate the work at this time, a tapered opening 14E (FIG. 5) may be provided at the inlet portion of the through hole 14C.

The bearing fixing portion 14D is a thick cylindrical portion (boss portion) having a thick wall thickness t2 in the plane direction of the flat surface portion 14h with respect to a wall thickness t1 of the flat surface portion 14h of the gear cover 14 on which the connector 17 and the motor 200 are provided. ). That is, the bearing fixing portion 14D forms a cylindrical protruding portion protruding toward the outside of the gear cover 14, and the radial wall thickness t2 of the bearing fixing portion 14D is the wall pressure of the flat surface portion 14h of the gear cover 14. Thicker than t1.

The plurality of through holes 14C are arranged side by side in the circumferential direction centered on the rotation axis center LC of the motor 100, and penetrate from the upper end surface of the protruding side of the boss portion 14D to the inner wall side of the gear cover 14. The outer peripheral surface of the boss portion 14D is positioned in the radial direction of the motor case 23 so that the coil wire 26A is inserted into the through hole 14C when the motor case 23 is assembled to the boss portion 14D.
Further, the boss portion 14D has a thick wall thickness t2 in the radial direction (planar direction of the flat surface portion 14h), and sufficient rigidity is ensured even when the through hole 14C is provided.

FIG. 6 is an enlarged cross-sectional view of the motor 200 and the motor / gear assembly 201 according to the first embodiment of the present invention.

The bearing holding inner diameter db of the bearing fixing portion 14D is set to a dimension (db≈Db) so as to be an intermediate fit with the outer diameter Db of the bearing 31. In this embodiment, the sensor magnet 32 that detects the rotation of the motor 200 is arranged inside the bearing fixing portion 14D in the radial direction.
Therefore, the outer diameter Dm of the sensor magnet 32 is smaller than db (Dm <db), and the size is such that the sensor magnet 32 can rotate inside the inner diameter of the bearing fixing portion 14D. Further, the outer diameter Dm of the sensor magnet 32 is larger than the inner diameter ds of the first board hole 18B (FIG. 3) provided in the inverter circuit board 18 (Dm <ds), and the hole IC 19 mounted on the back surface of the inverter circuit board 18 The outer diameter is set so that the sensor magnet 32 and the sensor magnet 32 are close to each other in the radial direction of the first substrate hole 18B. Further, the tooth tip circle diameter Dg of the motor gear 13 is made smaller than ds so that the motor gear 13 can be assembled through the first substrate hole 18A in a state where the motor / gear assembly 201 is used.

Summarizing the above, this implementation is carried out by designing or selecting the gear cover 14, bearing 31, sensor magnet 32, inverter circuit board 18, and motor gear 13 in the dimensional relationship of db≈Db> Dm> ds> Dg. The example cover module 100 can be easily assembled.

The electronically controlled throttle device 500 of this embodiment is configured as follows.

A body 1 that houses the throttle valve 5, a resin gear cover 14 that is connected to the body 1 and forms a storage space for the

gears

8, 12, and 13 between the body 1 and a gear cover 14 provided on the outer wall side of the gear cover 14. A brushless motor 200 that rotates the gear, an inverter circuit board 18 that is provided on the inner wall side of the gear cover 14 and controls the drive of the brushless motor 200, and a bearing 31 that supports the rotating shaft 29 of the brushless motor 200. The gear cover 14 has a bearing fixing portion 14D provided between the brushless motor 200 and the inverter circuit board and fixing the bearing 31, and the bearing fixing portion 14D is pulled out from the drive coil 26 of the brushless motor 200. A plurality of through holes 14C for passing the plurality of coil leader wires 26A are formed.

[Example 2] Example 2 will be described with reference to FIG. 7. FIG. 7 is an exploded perspective view of the cover module 100 according to the second embodiment of the present invention. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. If there is a difference between the configuration with the same reference numerals as that of the first embodiment and the first embodiment, the difference will be described.

In the second embodiment, in the electronically controlled throttle device 500 described in the first embodiment, the plurality of through holes 14C provided in the gear cover 14 are arranged in the circumferential direction centered on the rotation axis center LC of the motor (brushless motor) 200. Placed in. In this embodiment, the plurality of through holes 14C are arranged at the same radius (on the circle C1) centered on the rotation axis center LC of the motor (brushless motor) 200.

As a result, a plurality of coil wires 26A drawn from positions equal to the circumferential direction from the rotation axis center LC of the motor 200 are passed through the through holes 14C of the gear cover 14 in the same drawing method, and the coil connection of the inverter circuit board 18 is made. It can be connected to the unit 18A.

Other configurations and effects are the same as in Example 1.

[Example 3] Example 2 will be described with reference to FIG. FIG. 8 is an exploded perspective view of the cover module 100 according to the third embodiment of the present invention. In the third embodiment, the same configurations as those of the first and second embodiments are designated by the same reference numerals as those of the first and second embodiments, and the description thereof will be omitted. If there is a difference between the configurations with the same reference numerals as those of Example 1 and Example 2 and those of Example 1 and Example 2, the difference will be described.

In the third embodiment, in the electronically controlled throttle device 500 described in the second embodiment, the plurality of through holes 14C provided in the gear cover 14 are arranged point-symmetrically with respect to the rotation axis center LC of the motor (brushless motor) 200. To. That is, as in the gear cover 14 shown in FIG. 8, the through holes 14C are arranged point-symmetrically with respect to the center of the rotation axis of the motor 200. In particular, in this embodiment, four through holes 14C are formed, and the four through holes 14C are arranged at intervals such that the central angle around the center LC of the rotation axis is 90 °.

In the case of this embodiment, three coil wires 26A are drawn out from the three-phase drive coil 26, and three through holes 14C are sufficient. That is, three through holes 14C out of the four through holes 14C are used, and one through hole 14C is a dummy that is not used as an insertion hole for the coil wire 26A. In other words, the plurality of through holes 14C include a coil leader wire insertion hole through which the coil wire (coil leader wire) 26A is inserted and a dummy coil leader wire insertion hole through which the coil wire (coil leader wire) 26A is not inserted. ..

As a result, in the bearing fixing portion (boss portion) 14D, the resin flow during molding of the resin cover is point-symmetrical with respect to the rotation axis center LC of the motor 200, and deformation in one direction after molding and bias in strength are prevented. Can be prevented.

Other configurations and effects are the same as in Examples 1 and 2.

According to the embodiment of the present invention, the wiring between the brushless motor 200 and the drive circuit board 18 can be simplified, the number of electrical connection points can be reduced, and the number of parts can be reduced at the same time.
Further, since the wiring (coil wire) 26A is held by the through hole 14C, the vibration resistance is also improved. Further, the throttle sensor board 20 and the drive circuit board 18, which are arranged so as to overlap each other in the prior art, can be arranged in a plane, and therefore the thickness of the cover module 100 can be reduced.

The present invention is not limited to the above-described embodiments, but includes various modifications. 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 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.

1 ... Body, 5 ... Throttle valve, 8, 12, 13 ... Gear, 14 ... Gear cover, 14C ... Through hole, 14D ... Bearing fixing part, 14h ... Gear cover 14 flat part, 18 ... Inverter circuit board, 26 ... Drive coil, 26A ... Coil leader wire, 29 ... Rotating shaft of

brushless motor

200, 31 ... Bearing, 32 ... Sensor magnet, 200 ... Brushless motor.

Claims

The body that houses the throttle valve and
A resin gear cover that is connected to the body and forms a storage space for the gear between the body and the body.
A brushless motor provided on the outer wall side of the gear cover and rotating the gear,
An inverter circuit board provided on the inner wall side of the gear cover and controlling the drive of the brushless motor, and
With a bearing that supports the rotating shaft of the brushless motor,
The gear cover has a bearing fixing portion provided between the brushless motor and the inverter circuit board and for fixing the bearing.
The bearing fixing portion is an electronically controlled throttle device in which a plurality of through holes for passing a plurality of coil leader wires drawn from the drive coil of the brushless motor are formed.
The electronically controlled throttle device according to claim 1.
The plurality of through holes are electronically controlled throttle devices arranged side by side in the circumferential direction about the center of the rotation axis of the brushless motor.
The electronically controlled throttle device according to claim 2.
The plurality of through holes are electronically controlled throttle devices arranged at the same radius around the center of the rotation axis of the brushless motor.
The electronically controlled throttle device according to claim 1.
The plurality of through holes are electronically controlled throttle devices arranged point-symmetrically with respect to the center of the rotation axis of the brushless motor.
The electronically controlled throttle device according to claim 4.
The plurality of through holes are an electronically controlled throttle device including a coil leader wire insertion hole through which the coil leader wire is inserted and a dummy coil leader wire insertion hole through which the coil leader wire is not inserted.
The electronically controlled throttle device according to claim 1.
The bearing fixing portion forms a cylindrical protruding portion that protrudes toward the outside of the gear cover.
An electronically controlled throttle device in which the radial wall thickness of the bearing fixing portion is thicker than the wall pressure of the flat surface portion of the gear cover.
The electronically controlled throttle device according to claim 1.
An electronically controlled throttle device in which a sensor magnet for detecting the rotation of the brushless motor is arranged inside the bearing fixing portion in the radial direction.