JP2006307869A - Throttle valve control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throttle valve control device capable of enhancing vibration-resistance of a motor. <P>SOLUTION: This device includes a throttle body 1 forming an intake passage 1a, a throttle valve 13 enabling the intake passage 1a to be opened or closed, and a motor 3 driving the throttle valve 13. One end of the motor 3 is fixed at the throttle body 1 in an over hang state. The other end 31b of the motor 3 is supported by a support member 20 to the throttle body 1. The support member 20 is formed of a plate spring member. The support member 20 is disposed in an almost flat plate extending in a radial direction with respect to the motor 3. The support member 20 is formed so that the other end 31b of the motor 3 can be fitted into the support member 20 by using the deflection of only the contact side thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a throttle valve control device for driving a throttle valve of an automobile engine by a motor, for example.

  As a conventional example of the throttle valve control device, for example, there is one described in Patent Document 1. The throttle valve control device of the publication includes a throttle body that forms an intake passage, a throttle valve that can open and close the intake passage, and a motor that drives the throttle valve. The throttle valve is driven by a motor, that is, is opened and closed, whereby the amount of intake air flowing through the intake passage is adjusted, and the output of the engine is controlled based on this.

JP-A-5-180006

  By the way, in the conventional throttle valve control apparatus, only one end of the motor is fixed to the throttle body in a cantilever manner. Therefore, the other end portion of the motor is likely to vibrate in the radial direction due to vibration of the engine or the like, and thus the motor is not satisfied with vibration resistance.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a throttle valve control device capable of improving the vibration resistance of a motor.

The above-mentioned problem can be solved by a throttle valve control device having a configuration described in the appended claims.
That is, according to the throttle valve control device of the first aspect, the amount of intake air flowing through the intake passage is adjusted by driving the throttle valve by the motor.
By the way, one end of the motor is cantilevered to the throttle body. At the same time, the other end of the motor is supported on the throttle body by a support member made of a material having good thermal conductivity.
Therefore, since the motor is supported by the throttle body in a doubly supported manner, vibrations in the radial direction at the other end of the motor are suppressed, so that the vibration resistance of the motor can be improved.
Further, the support member is made of a material having good thermal conductivity. For this reason, using the support member, heat generated by the motor can be efficiently conducted to the throttle body, and the heat can be dissipated. Thereby, the failure of the motor due to the high temperature of the motor can be avoided.

According to the throttle valve control device described in claim 2, the amount of intake air flowing through the intake passage is adjusted by driving the throttle valve with a motor.
By the way, one end of the motor is cantilevered to the throttle body. At the same time, the other end of the motor is supported by a support member formed of a leaf spring on the throttle body.
Therefore, since the motor is supported by the throttle body in a doubly supported manner, vibrations in the radial direction at the other end of the motor are suppressed, so that the vibration resistance of the motor can be improved.
Furthermore, since the support member is formed of a leaf spring, there is no rubber sag or the like as compared with a support member made of elastic rubber or the like, and a reduction in vibration resistance of the motor can be prevented.

  Further, according to the throttle valve control device of the third aspect, since the support member is a material having good thermal conductivity, the support member is used to efficiently conduct heat generated by the motor to the throttle body, The heat can be dissipated. Thereby, the failure of the motor due to the high temperature of the motor can be avoided.

  According to the throttle valve control device described in claim 4, since the support member is arranged in a substantially flat plate shape extending in the radial direction with respect to the motor, the motor is supported with high support rigidity in the radial direction. Can do. Further, the support member can be arranged compactly with respect to the axial direction of the motor.

  According to the throttle valve control device described in claim 5, the other end of the motor is fitted into the support member using the bending deformation of only the end on the contact side thereof. The portion can be easily supported with high support rigidity in the radial direction.

  According to the throttle valve control device of the present invention, the vibration resistance of the motor can be improved by the motor being supported by the throttle body in a doubly supported manner.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the following examples.

[Example 1]
A first embodiment of the present invention will be described with reference to the drawings. 1 is a sectional view of the throttle valve control device, FIG. 2 is a sectional view of the main part of FIG. 1, FIG. 3 is a front view of the support member, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

In FIG. 1, the throttle body 1 is formed with a substantially cylindrical intake passage 1a. The intake passage 1a communicates with the intake passage of the engine. The throttle body 1 is formed of a metal material such as aluminum die cast.
Both ends of a throttle shaft 2 that penetrates the intake passage 1a in the radial direction are rotatably supported by the throttle body 1 via bearings (reference numerals omitted).
A substantially disc-shaped throttle valve 13 that can open and close the intake passage 1a by turning is attached to the throttle shaft 2. The intake air amount flowing through the intake passage is adjusted by opening and closing the intake passage 1a by the throttle valve 13.

  A gear housing portion 1e is formed on a peripheral portion of one side surface (left side surface in FIG. 1) of the throttle body 1. A gear cover 8 that closes the opening is attached to the opening end surface of the gear housing portion 1e. The gear housing portion 1e and the gear cover 8 form an accommodation space 8a such as a gear.

One end portion (left end portion in FIG. 1) of the throttle shaft 2 protrudes into the housing space 8a through the boss portion 1b of the throttle body 1. An engagement shaft portion 2a having a substantially square cross section is formed at the end of the throttle shaft 2 in the accommodation space 8a. A throttle gear 5 made of a sector gear is fixed on the engagement shaft portion 2a.
Further, a small diameter shaft portion 2 b projects from the engagement shaft portion 2 a of the throttle shaft 2. The small diameter shaft portion 2 b penetrates the gear cover 8.

A motor case portion 1c having a substantially bottomed cylindrical shape is formed on one side portion (upper portion in FIG. 1) of the throttle body 1. The motor case part 1c is open to the accommodation space 8a.
For example, a motor 3 made of a DC motor or the like is inserted into the motor case 1c. The motor 3 has an output shaft 3A that protrudes to the opposite insertion side (left side in FIG. 1). A drive gear 3a is fixed on the output shaft 3A.

  The motor 3 has a motor housing 31 that forms the outline of the motor 3. The motor housing 31 has a mounting flange portion 31a that protrudes in the radial direction (the front and back direction in FIG. 1) at the end on the opposite side to the insertion side, that is, the output side (left side in FIG. 1). Further, the motor housing 31 has a motor end portion 31b having a small-diameter shaft that protrudes from an end surface on the insertion side (the right end surface in FIG. 1). The motor end portion 31b corresponds to “the other end portion of the motor” in this specification.

  Therefore, prior to the insertion of the motor 3 into the motor case portion 1c, a support member 20 described below is attached to the bottom of the motor case portion 1c. The bottom surface of the motor case 1c is formed with a small diameter stepped hole 1d.

The support member 20 will be described. As shown in FIGS. 3 and 4, the support member 20 is formed in a substantially ring-shaped flat plate shape using a metal leaf spring material having good thermal conductivity such as iron or copper. The support member 20 is formed with a substantially circular support hole 21 concentrically. An appropriate number (three are shown in FIG. 3) of cut grooves 22a are formed radially on the edge portion 22 of the support hole 21 of the support member 20. Thereby, the bending deformation of only the mouth edge part 22 is attained. The mouth edge portion 22 corresponds to the “end portion on the contact side with respect to the other end portion of the motor” in the present specification.
The rim portion 22 of the support member 20 is bent in an inclined manner toward one side (rightward in FIG. 4). The support hole 21 of the support member 20 is formed with a diameter slightly smaller than the outer diameter of the motor end portion 31 b of the motor 3.

  In addition, a substantially cylindrical fitting edge 24 that is bent in the opposite direction of the mouth edge 22 is formed on the outer periphery of the support member 20. The outer diameter of the fitting edge 24 is formed to be slightly larger than the inner diameter of the concave hole 1d at the bottom of the motor case 1c.

  As shown in FIG. 2, the above-described support member 20 is fitted into the concave hole 1d at the bottom of the motor case portion 1c. At this time, the support member 20 is attached in the motor case part 1c by press-fitting the fitting edge part 24 of the support member 20 into the concave hole 1d.

Next, the motor 3 is inserted into the motor case portion 1c. Then, the motor end portion 31 b of the motor housing 31 of the motor 3 is fitted into the support hole 21 of the support member 20 by using the bending deformation of only the edge portion 22, so that the motor end portion 31 b is supported by the support member 20. Has been. As a result, the support member 20 is disposed in a substantially flat plate shape extending in the radial direction with respect to the motor 3.
Thereafter, as shown in FIG. 1, the mounting flange portion 31 a of the motor housing 31 of the motor 3 is fixed to the opening side end surface of the motor case portion 1 c by fastening the screw member 28.

  As shown in FIG. 1, a counter shaft 15 is installed between the throttle body 1 and the gear cover 8 so as to cross the accommodation space 8 a. A counter gear 4 positioned in the accommodation space 8a is rotatably supported on the counter shaft 15. The large-diameter gear portion 4a of the counter gear 4 is meshed with the drive gear 3a. Further, the small-diameter gear portion 4 b of the counter gear 4 is engaged with the throttle gear 5.

  Although not shown, the motor 3 is driven and controlled by a known control circuit (not shown). The control circuit outputs a drive signal for driving and controlling the motor 3 in accordance with the operating state of an engine (not shown). The driving force of the motor 3 is transmitted to the throttle shaft 2 through the driving gear 3a, the counter gear 4 and the throttle gear 5, whereby the throttle valve 13 is driven, that is, opened and closed.

  A relief lever 9 located in the accommodation space 8a is rotatably supported on the throttle shaft 2. Between the relief lever 9 and the throttle body 1, a back spring 11 that urges the relief lever 9 toward the valve closing direction with respect to the throttle body 1 is interposed. Further, a relief spring 10 is provided between the relief lever 9 and the throttle gear 5 to urge the throttle gear 5 toward the valve opening direction with respect to the relief lever 9 at all times. The relief lever 9 and the throttle gear 5 are engaged with each other by the urging force of the back spring 11 and the relief spring 10. Note that a description of the relief lever 9 is well known and will be omitted (for example, see JP-A-3-271528).

A sensor housing portion 8b is formed on the outer side surface (left side surface in FIG. 1) of one end portion (lower end portion in FIG. 1) of the gear cover 8. A sensor substrate 7 is attached in the sensor housing portion 8b. The opening end surface of the sensor housing portion 8 b is closed by the sensor cover 16.
A sensor lever 6 positioned in the sensor housing portion 8b is fixed to the small diameter shaft portion 2b of the throttle shaft 2. The sensor lever 6 and the sensor substrate 7 constitute a throttle sensor that detects the opening degree of the throttle valve 13 as is well known.

  In the throttle valve control device described above, when the engine is started, the motor 3 is driven and controlled by a control circuit (not shown). By driving the motor 3, the throttle valve 13 is opened and closed as described above, so that the amount of intake air flowing through the intake passage 1a of the throttle body 1 is adjusted.

  According to the throttle valve control device described above, since the motor 3 is supported by the throttle body 1 in a double-sided manner, vibrations in the radial direction of the motor end portion 31b of the motor 3 are suppressed. Can be improved.

Incidentally, when the motor end portion 31b is directly supported by the motor case portion 1c of the throttle body 1, it is necessary to press-fit the motor end portion 31b into the motor case portion 1c. In this case, the rigidity of the motor case portion 1c is higher than the rigidity of the motor end portion 31b, and the deformation of the interference amount due to the press-fitting is larger in the motor end portion 31b. Then, it is predicted that the deformation of the motor end portion 31b may cause problems such as unstable rotation of the output shaft 3A and locking of the output shaft 3A.
However, as described above, by supporting the motor end portion 31b on the motor case portion 1c via the support member 20 (see FIG. 2), the deformation of the motor end portion 31b is avoided and the problems due to the deformation are eliminated. be able to.

  Further, the support member 20 is made of a material having good thermal conductivity. For this reason, the support member 20 can be used to efficiently conduct the heat generated by the motor 3 to the throttle body 1 and dissipate the heat. Thereby, the failure of the motor 3 resulting from the high temperature of the motor 3 can be avoided.

  Further, since the support member 20 is formed of a leaf spring, there is no rubber sag or the like as compared with a support member made of elastic rubber or the like, and a reduction in vibration resistance of the motor 3 can be prevented.

  Further, since the support member 20 is disposed in a substantially flat plate shape extending in the radial direction with respect to the motor 3, the motor 3 can be supported with high support rigidity in the radial direction. Further, the support member 20 can be arranged compactly with respect to the axial direction of the motor 3.

  Further, by fitting the motor end portion 31b of the motor 3 into the support member 20 by using the bending deformation of only the end portion on the contact side, the motor end portion 31b of the motor 3 can be easily and high in the radial direction. It can be supported with support rigidity.

  Further, the support member 20 is fitted into the motor case portion 1c of the throttle body 1 by press fitting. For this reason, the support member 20 can be easily attached to the throttle body 1.

[Example 2]
A second embodiment of the present invention will be described. Since Example 2 shows another example of the support member 20 in Example 1, it will be described in detail, and overlapping description will be omitted. FIG. 5 is a front view of the support member 20, and FIG. 6 is a sectional view taken along line VI-VI in FIG.

  The support member 20 in this embodiment is replaced with the fitting edge 24 in the first embodiment, and an appropriate number (six in FIG. 3) of fitting protrusions 25 are provided on the outer peripheral portion of the support member 20. Projecting radially. The fitting protrusion 25 is formed so as to be able to bend and deform.

  The support member 20 described above is fitted into the recessed hole 1d at the bottom of the motor case portion 1c, similarly to the support member 20 (see FIG. 1) in the first embodiment. At this time, the support member 20 is mounted in the motor case portion 1c by being fitted into the concave hole 1d using the deformation of the fitting protrusion 25.

Also by the support member 20 described above, substantially the same function and effect as those of the first embodiment can be obtained.
Further, the support member 20 is fitted into the motor case portion 1 c of the throttle body 1 using the bending deformation of the fitting protrusion 25. For this reason, the support member 20 can be easily attached to the throttle body 1.

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the support member 20 can be provided in the throttle body 1 without providing the motor case portion 1c. The support member 20 can be formed of a material other than the leaf spring material or a material having poor thermal conductivity. Further, the support member 20 may elastically support the motor end portion 31b of the motor 3 using its elasticity. Further, the support member 20 may support a main portion of the motor housing 31 instead of the motor end portion 31 b of the motor 3.

It is sectional drawing which shows the throttle valve control apparatus concerning Example 1 of this invention. It is sectional drawing which shows the principal part of FIG. It is a front view which shows a supporting member in FIG. It is the IV-IV sectional view taken on the line of FIG. It is a front view which shows the support member concerning Example 2 of this invention. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throttle body 1a Intake passage 3 Motor 13 Throttle valve 20 Support member 21 Support hole 31b Motor end part (the other end part of a motor)

Claims (3)

A throttle body that forms an intake passage, a throttle valve that can open and close the intake passage, and a motor that drives the throttle valve,
A first support member that supports one end of the motor in the longitudinal direction and fixes the longitudinal and radial positions of the end, and elastically supports the other end of the motor in the longitudinal direction. A second support member,
The second support member is a ring having a first fitting portion on its inner peripheral portion and a second fitting portion on its outer peripheral portion,
The first fitting portion is in contact with the motor;
The second fitting portion is in contact with the throttle body;
The first fitting portion has cuts formed at predetermined intervals on the inner peripheral portion of the ring,
The throttle valve control device, wherein a diameter of the first fitting portion is set to be slightly smaller than an outer diameter of a motor portion in contact with the second support member. A throttle body that forms an intake passage, a throttle valve that can open and close the intake passage, and a motor that drives the throttle valve,
A first support member that supports one end of the motor in the longitudinal direction and fixes the longitudinal and radial positions of the end, and elastically supports the other end of the motor in the longitudinal direction. A second support member,
The second support member is a ring having a first fitting portion on its inner peripheral portion and a second fitting portion on its outer peripheral portion,
The first fitting portion is in contact with the motor;
The second fitting portion is in contact with the throttle body;
The second fitting portion is formed in a cylindrical shape having a peripheral wall,
The throttle valve control device, wherein the second fitting portion is fitted to the throttle body, and the peripheral wall is in pressure contact with the inner wall of the throttle body. A throttle body that forms an intake passage, a throttle valve that can open and close the intake passage, and a motor that drives the throttle valve,
A first support member that supports one end of the motor in the longitudinal direction and fixes the longitudinal and radial positions of the end, and elastically supports the other end of the motor in the longitudinal direction. A second support member,
The second support member is a ring having a first fitting portion on its inner peripheral portion and a second fitting portion on its outer peripheral portion,
The first fitting portion is in contact with the motor;
The second fitting portion is in contact with the throttle body;
The second fitting portion has a plurality of projecting pieces,
The plurality of projecting pieces are arranged at predetermined intervals in the circumferential direction, and extend in the radial direction of the ring,
The plurality of projecting pieces are elastically bent in the axial direction of the motor and are in pressure contact with the inner wall of the throttle body.

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