JP2000145482A - Throttle control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the problem of a throttle valve deviating from its required position of opening in a system in which motor power drive is transmitted via a drive transmission means to open and close the throttle valve by installing between a housing and the motor an engagement means that restricts the position of the motor body in its turning direction. SOLUTION: A circular movement of an output shaft 10 either in a forward or backward direction as a result of a motor 6 turning is changed to an open/ close motion of a throttle valve 4 via an arm 11 and a link 12 to control the opening of the throttle valve 4. In this system, an elastic grommet 24 is secured to a case 6a of the motor 6 with a screw 21 so that an outer peripheral surface of the grommet 24 can abut against an inner side surface of a recessed portion 5a of a housing 5 when the motor turns. That is, the motor 6 is free floating with respect to the housing 5 via vibration damping rubbers 8a to 8c and the grommet 24, thereby preventing the motor 6 from being damaged by vibration. In addition, the grommet 24 prevents the motor 6 body from moving circularly either forward or backward and enhances accuracy in control of the opening of the throttle valve 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle control device, and more particularly, to a mounting structure of a motor supported by using a floating structure using a vibration isolating member.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional throttle control device 1. In the throttle body 2, an intake passage 3 communicating with a combustion chamber of the engine is formed. In the intake passage 3, a throttle valve 4 for opening and closing the passage 3 is rotatably supported by a shaft (not shown). A housing 5 of a motor 6 for opening and closing the throttle valve 4 is formed integrally with the throttle body 2. The housing 5 is formed in a bottomed cylindrical shape.

[0003] A substantially columnar motor 6 is mounted on the housing 5.
After the insertion, a lid 7 is attached to the opening of the housing 5 so that the motor 6 cannot be pulled out. As shown in FIGS. 8 and 9, ring-shaped anti-vibration rubbers 8 a and 8 b are interposed between the motor 6, the housing 5 and the lid 7 at two predetermined positions. When the motor 6 is inserted, the vibration isolating rubbers 8a and 8b are elastically deformed (compressed) by the outer peripheral surface of the case 6a of the motor 6 and the inner peripheral surface of the housing 5 and attached. That is, the motor 6
By interposing anti-vibration rubbers 8a and 8b between the housing 5 and the lid 7, it is attached to the housing 5 and the lid 7 in a floating state.

[0004] The motor 6 is integrally assembled with a reduction section 9 composed of a planetary gear or the like. This deceleration unit 9
The rotation of the motor 6 is decelerated and converted into a rotational motion of the output shaft 10. As shown in FIG.
1 is fixed to the base end, and a link 12
Is rotatably supported at one end. The other end of the link 12
It is connected to the throttle valve 4. That is, the rotational movement of the output shaft 10 by the operation of the motor 6 is
And the link 12 is converted into the opening and closing movement of the throttle valve 4. Then, the motor 6 is controlled by a control circuit (ECU) (not shown) so that the throttle valve 4 is at the optimum rotation position at that time.

In the throttle control device 1 configured as described above, excessive vibration generated in the engine or the like is transmitted to the housing 5 and the lid 7 through the throttle body 2. However, since the motor 6 is attached to the housing 5 and the lid 7 in a floating state by the vibration isolating rubbers 8a and 8b, the vibration from the housing 5 and the lid 7 is attenuated and transmitted to the motor 6. Is done.
Such a vibration-proof structure prevents the motor 6 from being damaged by vibration.

[0006]

However, the motor 6
Are vibration-proof rubbers 8a, 8 compressed against the housing 5.
It is held so as not to rotate by the frictional force b. Therefore, when the vibration transmitted to the housing 5 and the lid 7 exceeds the compression load of the vibration isolating rubbers 8a and 8b, the motor 6 is unevenly distributed with respect to the housing 5 and the case 6 of the motor 6
a The outer peripheral surface may not contact the vibration isolating rubbers 8a and 8b equally over the entire circumference. In such a case, between the motor 6 and the vibration isolating rubbers 8a and 8b (or
a, 8b, and between the housing 5 and the lid 7).

At this time, the motor 6 operates and the arm 11
When the motor 6 rotates, a reaction force accompanying the rotation of the arm 11 acts on the motor 6 in the rotation direction of the motor 6 main body. For this reason, there is a problem that the main body of the motor 6 rotates with respect to the housing 5, the relative position between the motor 6 and the throttle valve 4 shifts, and the opening amount of the throttle valve 4 shifts from a desired opening amount. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor supported by a vibration isolating member on a housing using a floating structure. An object of the present invention is to provide a throttle control device using a motor mounting structure capable of preventing rotation of the motor.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention rotatably supports a throttle valve for opening and closing a throttle body having an intake passage. A substantially columnar motor supported by a vibration isolating member using a floating structure with respect to a housing provided integrally with the throttle body, and the rotational movement of the motor is controlled by drive transmission means to open and close the throttle valve. In the throttle control device for converting into motion, between the housing and the motor,
Engaging means are provided for engaging each other to regulate the position of the motor body in the rotation direction.

According to a second aspect of the present invention, in the throttle control device according to the first aspect, the engagement means includes a projection provided on one of the housing or the motor and a recess provided on the other. is there.

According to a third aspect of the present invention, in the throttle control device according to the second aspect, the protrusion is provided on the motor, and the recess is provided on the housing. Claim 4
According to a third aspect of the present invention, in the throttle control device according to the third aspect, the protrusion is a screw and is fixed to the case of the motor.

According to a fifth aspect of the present invention, in the throttle control device of the third aspect, the protrusion is formed integrally with a case of the motor. The invention according to claim 6 is
The throttle control device according to any one of claims 1 to 5, wherein the engagement means includes a vibration damping member interposed at a portion to be engaged.

According to a seventh aspect of the present invention, in the throttle control device according to the sixth aspect, the vibration damping member includes:
It is assembled integrally with the engaging means. Therefore, according to the first aspect of the present invention, the housing and the motor are engaged with each other by the engagement means, and the engagement means regulates the position of the motor body in the rotation direction. Therefore, since the rotation of the motor body is prevented, there is no relative displacement between the motor and the throttle valve, and the throttle valve is always controlled to a desired opening amount by the motor.

According to the second aspect of the present invention, the projection is provided on one of the housing and the motor, and the recess is provided on the other. The engagement between the projection and the recess restricts the position of the motor body in the rotation direction, thereby preventing the rotation of the motor body.

According to the third aspect of the present invention, the motor is provided with a projection, and the housing is provided with a recess.
The engagement between the projection and the recess restricts the position of the motor body in the rotation direction, thereby preventing the rotation of the motor body.

According to the fourth aspect of the present invention, the screw is fixed to the motor case, and the screw engages with the recess of the housing. Thus, the position of the motor body in the rotation direction is regulated, and the rotation of the motor body is prevented.

According to the fifth aspect of the present invention, the projection is integrally formed with the case of the motor, and this projection engages with the recess of the housing. Thus, the position of the motor body in the rotation direction is regulated, and the rotation of the motor body is prevented.

According to the sixth aspect of the present invention, the vibration damping member provided in the engaging means is interposed at the portion to be engaged. Since this housing is provided integrally with the throttle body, excessive vibration generated by an engine or the like is transmitted to the housing similarly to the throttle body. Therefore, the engagement means regulates the position of the motor body in the rotational direction,
A vibration damping member provided in the engagement means attenuates vibration transmitted from the housing to the motor via the engagement means.
As a result, the rotation of the main body of the motor is prevented, and the motor is reliably supported by the vibration isolating member and the vibration damping member in a floating state with respect to the housing.

According to the seventh aspect of the present invention, the vibration damping member is assembled integrally with the engagement means, so that the motor can be easily assembled to the housing.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. For convenience of description, the same components as those of the conventional example shown in FIGS. 8 to 10 are denoted by the same reference numerals, and the description thereof is partially omitted.

FIGS. 1 to 5 show a throttle control device 20 according to this embodiment. Throttle control device 20 of this embodiment
Has a structure for preventing the rotation of the motor 6 body with respect to the housing 5. In this embodiment, ring-shaped anti-vibration rubbers 8a to 8c are interposed between the motor 6, the housing 5, and the lid 7 at predetermined three places. That is, the motor 6 is attached to the housing 5 and the lid 7 in a floating state using the three vibration-proof rubbers 8a to 8c.

A recess 5a is formed in the opening of the housing 5 and extends radially outward. The recess 5 a has a substantially rectangular cross section and extends in the axial direction from the opening end of the housing 5. Further, the lid 7 is formed with an extension 7a for closing the opening of the recess 5a.

On the other hand, a screw hole 6b extending in the radial direction is formed in the case 6a of the motor 6 at a position corresponding to the concave portion 5a. A screw 21 is screwed into the screw hole 6b. At the time of the screwing, a washer 22, a cylindrical collar 23, and a substantially cylindrical grommet 24 arranged outside the collar 23 are attached to the screw 21. In this embodiment, the screw 2
1 is screwed into the screw hole 6b before screwing, and the case 6
The screw 21 is securely fixed to a.

The grommet 24 is made of rubber having elasticity, and is formed of the same material as the vibration-proof rubbers 8a to 8c. The material is, for example, EPDM, nitrile rubber, butyl rubber, fluorine rubber, silicon rubber, or the like. Incidentally, according to an experiment conducted by the present applicant, it is considered that the grommet 24 is desirably formed with a thickness of 0.5 mm or more and a hardness of 30 degrees or more.

The collar 23 has a screw 21 attached to the case 6a of the motor 6 so that when the motor 6 is inserted into the housing 5, the outer peripheral surface of the grommet 24 abuts at a predetermined position on the inner surface of the recess 5a. So-called grommet 2
Used as a size 4

The washer 22 contacts the end surface of the grommet 24 on the side opposite to the case 6a, and
4 is prevented from coming off. As described above, in the present embodiment, the elastic grommet 24 is fixed to the case 6 a of the motor 6 with the screw 21, and the outer peripheral surface of the grommet 24 contacts the inner surface of the recess 5 a of the housing 5 at least in the rotation direction of the motor 6. It is configured to touch. At this time, screw 21
Does not come into contact with the recess 5a. That is, the motor 6 is attached to the housing 5 and the lid 7 in a floating state by the vibration isolating rubbers 8a to 8c and the grommet 24, that is, the elastic member. Therefore, the vibration from the housing 5 and the lid 7 is attenuated and transmitted to the motor 6, and the motor 6 is prevented from being damaged by the vibration. In addition, since the grommet 24 abuts on the inner surface of the recess 5a in the rotation direction of the motor 6, the position of the motor 6 in the rotation direction is regulated, and the rotation of the motor 6 is prevented. Therefore, in this embodiment, there is no relative displacement between the motor 6 and the throttle valve 4, and the throttle valve 4 can always be controlled to a desired opening amount.

As shown in FIG. 4, the length of the inner surface of the recess 5a in the insertion direction (axial direction) of the motor 6 is formed to be slightly larger than the outer diameter of the grommet 24. In this way, when the motor 6 is mounted on the housing 5, errors in the position of the screw holes 6b and dimensional errors of the grommet 24 are absorbed, and the mounting of the motor 6 is facilitated.

As shown in FIG. 1, the anti-vibration rubber 8c disposed at the central position in the axial direction has a substantially square cross section. Therefore, when the motor 6 is inserted into the housing 5, the motor 6 is inserted while being supported at two points in the axial direction by the anti-vibration rubber 8c. That is, the motor 6 can be inserted without a large deviation of the central axis of the motor 5 from the central axis of the housing 5. Therefore, even if there is a step on the inner peripheral surface of the housing 5, the motor 6 is guided and inserted by the vibration isolating rubber 8c, so that the motor 6 is prevented from being caught on the step. As a result, the motor 6 can be easily inserted into the housing 5 by the vibration-proof rubber 8c.

As described above, in the present embodiment, the following functions and effects can be obtained. (1) The elastic grommet 24 is attached to the case 6a of the motor 6.
Are fixed by screws 21, and the outer peripheral surface of the grommet 24 abuts on the inner surface of the concave portion 5 a of the housing 5 in the rotation direction of the motor 6. That is, the motor 6 is attached to the housing 5 and the lid 7 with the vibration isolating rubbers 8 a to 8 c and the grommet 2.
4, that is, mounted in a floating state by an elastic member. Therefore, the vibration from the housing 5 and the lid 7 is attenuated and transmitted to the motor 6, so that the motor 6 can be prevented from being damaged by the vibration. In addition, since the grommet 24 abuts on the inner surface of the recess 5a in the rotation direction of the motor 6, the position of the motor 6 in the rotation direction is regulated, and the rotation of the motor 6 is prevented. Therefore, there is no relative displacement between the motor 6 and the throttle valve 4, and the throttle valve 4 can always be controlled to a desired opening amount.

(2) The rotation of the main body of the motor 6 can be prevented by the recess 5a formed in the housing 5, the screw 21, and the like. Therefore, the means for preventing the rotation can have a relatively simple configuration.

(3) Since the grommet 24 is fixed to the case 6a of the motor 6 with the screw 21, the assembling of the motor 6 to the housing 5 can be facilitated. Note that the embodiment of the present invention may be modified as follows.

In the above embodiment, the grommet 24 is fixed to the case 6a of the motor 6 with the screw 21.
As shown in FIGS. 6 and 7, a protrusion 6c extending radially outward may be formed on the case 6a, and a grommet 25 made of the same material as the grommet 24 may be attached to the protrusion 6c. By doing so, the screw 21, the washer 22, and the collar 23 can be omitted as compared with the above embodiment, so that the number of parts can be reduced. In addition, as shown in FIG.
d may be formed.

In the above embodiment, a protrusion (including the screw 21) is provided on the motor 6 side so that the recess 5a is formed in the housing 5.
Is provided, but the reverse is also possible. Further, the elastic grommets 24 and 25 may be omitted, and only the screw 21 or only the protrusion 6c may be used. In other words, the configuration is not limited to these as long as the engagement means that engages with the housing 5 and the motor 6 is provided and the position of the motor 6 can be regulated in the rotation direction.

In the above embodiment, the outer peripheral surface of the grommet 24 is brought into contact with the inner side surface of the concave portion 5a, but the size of the grommet 24 or the concave portion 5a is adjusted so that the concave portion 5a
May be assembled so that the grommet 24 is compressed. That is, it is only necessary that the grommet 24 is at least in contact with the inner surface of the recess 5a.

In the above embodiment, the grommet 24 made of rubber is used. However, a member other than rubber which attenuates vibration may be used instead of the grommet 24. For technical ideas other than the claims that can be grasped from the above embodiments,
The effect is described below.

(A) In the throttle control device according to claim 6 or 7, the vibration damping member is an elastic member. With this configuration, the engaging means regulates the position of the motor body in the rotational direction, and the elastic member provided in the engaging means attenuates vibration transmitted from the housing to the motor via the engaging means. As a result, the motor can be reliably supported in a floating state by the elastic member and the vibration damping member with respect to the housing while preventing the rotation of the motor body, so that a reliable vibration proof structure can be achieved.

[0037]

As described in detail above, according to the present invention,
It is possible to provide a throttle control device that uses a motor mounting structure that is a motor supported by a vibration isolating member with respect to a housing using a floating structure and that can prevent rotation of the motor body.

[Brief description of the drawings]

FIG. 1 is a plan view showing a throttle control device according to an embodiment.

FIG. 2 is a plan view showing a motor part.

FIG. 3 is a side view showing a motor portion.

FIG. 4 is a sectional view taken along line AA of FIG. 1 showing a main part of a motor portion.

FIG. 5 is a sectional view taken along the line BB of FIG. 1 showing a main part of a motor portion.

FIG. 6 is a sectional view showing a main part of another example of a motor portion.

FIG. 7 is a sectional view showing a main part of a motor part according to another example.

FIG. 8 is a plan view showing a conventional throttle control device.

FIG. 9 is a plan view showing a motor portion.

FIG. 10 is a side view showing a motor portion.

[Explanation of symbols]

2 ... Throttle body, 3 ... Intake passage, 4 ... Throttle valve, 5 ... Housing, 5a ... Concave portion forming engagement means, 6 ... Motor, 6a ... Case, 6c ... Protrusion forming engagement means, 8A- 8c: anti-vibration rubber as anti-vibration member, 9
... 12: a deceleration unit, an output shaft, an arm, and a link, which constitute drive transmission means; and 21, a screw, which constitutes engagement means;
5... A grommet as a vibration damping member constituting the engagement means.

Claims (7)

[Claims] 1. A throttle valve (4) for opening and closing a passage (3) is rotatably supported with respect to a throttle body (2) having an intake passage (3). A substantially columnar motor (6) supported using a floating structure by a vibration isolating member (8a to 8c) with respect to the housing (5) provided integrally is provided. In a throttle control device for converting a rotational movement of a motor (6) into an opening and closing movement of the throttle valve (4),
Engaging means (5a, 6c, 21, 24, 25) engaged with each other to regulate the position of the motor (6) body in the rotation direction.
A throttle control device comprising: 2. The throttle control device according to claim 1, wherein the engagement means includes a protrusion provided on one of the housing and the motor.
And a concave portion (5a) provided on the other side. 3. The throttle control device according to claim 2, wherein the protrusion (6c, 21, 24, 25) is provided on the motor (6), and the recess (5a) is provided on the housing (5). A throttle control device. 4. The throttle control device according to claim 3, wherein the protrusion is a screw (21) and is fixed to a case (6a) of the motor (6). Control device. 5. The throttle control device according to claim 3, wherein the protrusion (6c) is connected to a case (6) of the motor (6).
A throttle control device, which is integrally formed in a). 6. The throttle control device according to claim 1, wherein the engagement means (5a, 6c, 21, 24, 25) includes:
Vibration damping member (24, 25) interposed at the part to be engaged
A throttle control device comprising: 7. The throttle control device according to claim 6, wherein said vibration damping member (24, 25) is provided with said engaging means (5).
a, 6c, 21).