JP2001329868A - Throttle valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throttle valve control device capable of ensuring stable gear motion of a reduction gear mechanism connected to a servomotor. SOLUTION: A connecting pin 11a for positioning is provided so as to project in parallel with a throttle valve stem 2 toward a connecting chamber 6 from a throttle body 1, and assembling position is regulated by fitting the connecting pin 11a into a fitting hole 13a provided in a cover 7 and a through hole 13a formed in a flange 12 of the servomotor 4. The servomotor 4 and the cover 7 can be thereby accurately positioned and secured to the throttle body 1, and stable gear motion of the reduction gears 22, 23, 25 can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve control device suitable for electrically controlling the opening of a throttle valve of an internal combustion engine, for example.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Application Laid-Open No. 09-03 / 09
There is a throttle valve control device disclosed in Japanese Patent No. 2588.

However, this conventional throttle valve control device does not include a device for accurately positioning and fixing the servomotor and the cover with respect to the throttle body, and therefore, the motor drive shaft is misaligned due to manufacturing variations when the motor is assembled. There was something.

For this reason, in the conventional throttle valve control device, the meshing of the reduction gear connected to the servomotor is deteriorated, or in the electrical connection between the servomotor and the cover, when the cover is assembled, the servomotor is not connected. There is a possibility that the motor-side contact, the cover-side contact or the cover may be damaged or the electrical connection of the contact may be poor due to the relative displacement between the contact and the cover provided on the cover.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a throttle valve control device capable of ensuring a stable gear operation of a gear reduction mechanism connected to a servomotor.

[0006]

In order to solve the above-mentioned problems, the present invention adopts the technical means of claims 1 to 3.

According to the first aspect of the present invention, the servomotor is housed in the housing formed in the throttle body facing the connection chamber, and the servomotor projects from the throttle body toward the connection chamber in parallel with the throttle valve shaft. A pin is provided, and a cover is provided with a fitting hole for fixing one end of the coupling pin,
A first connecting portion that is a part of the electrical connection portion, wherein the coupling pin passes through a through hole formed in the flange of the servomotor, and one end is fitted into a fitting hole provided in the cover;
Since the connecting portion is detachably connected to the second connecting portion which is the other portion of the electrical connecting portion provided on the servomotor side, the connecting pin is formed in the fitting hole provided in the cover and the flange of the servomotor. As a result, the servomotor and the cover can be accurately positioned and fixed with respect to the throttle body, and a stable gear operation can be ensured.

According to the second aspect of the present invention, two connecting pins are provided and fitted in the same manner as in the first aspect.
The servo motor and the cover can be uniquely and accurately positioned and fixed to the throttle body, and a more stable gear operation can be secured as compared with the case of the first aspect.

According to the third aspect of the present invention, with regard to the electrical connection portion, a contact from the servo motor side is projected from the servo motor as a second connecting portion in parallel with the center axis of the coupling pin, The contact from the cover side is made to protrude from the cover in parallel with the center axis of the connecting pin with the cover closed as a first connection portion, and the second connection portion and the first connection portion face each other with the cover closed, Since the electrical connection is made elastically by the relay terminal which is a conductive elastic member fixed to a part of the cover, the servo motor and the cover are connected to the throttle body as in the case of the invention according to claim 1. Can be accurately positioned and fixed
In the electrical connection between the servomotor and the cover, the relative displacement between the contact from the servomotor and the contact from the cover provided on the cover during assembly of the cover is eliminated, and a stable electrical connection is obtained.

[0010]

1 to 3 relate to an embodiment of a throttle valve control device according to the present invention.
FIG. 2 is a front sectional view of the throttle valve control device (a sectional view taken along line II of FIG. 2), FIG. 2 is a right side view in a state where the cover 7 of FIG. 1 is removed, and FIG. Relay terminals 17a, 17b and protrusion 18 of cover 7 looking at the inner surface side
It is an inside front view near a and 18b.

The throttle valve control device includes a servo motor 4
It can be used in any internal combustion engine where it is desired to influence the output of the internal combustion engine using the throttle valve 3 which can be adjusted by the internal combustion engine.

1 and 2, a gas passage 19 extends through the throttle body 1. This gas passage 1
9 leads, for example, from an air filter (not shown) to one or more combustion chambers (not shown) of the internal combustion engine (not shown).

The cross section shown in FIG. 1 is a plane orthogonal to the longitudinal direction of the gas passage 19. Through the gas passage 19, for example, air or a fuel / air mixture flows.

The throttle valve shaft 2 extends laterally through the gas passage 19. The throttle valve shaft 2 has a gas passage 19
Are pivotally supported by two bearings 20a, 20b on both sides. The throttle valve shaft rotates around the bearings 20a and 20b.

The throttle valve 3 has fixing screws 21a, 21
It is fixed to the throttle valve shaft 2 using b.

The throttle valve shaft 2 is rotatable by about 90 °, and one end thereof is connected to the throttle sensor 5 outside the gas passage 19 and the other end is connected to the sector gear 22 outside the gas passage 19 so as to be relatively non-rotatable. Have been.

The sector gear 22 is a fan-shaped gear for reducing and increasing the driving force of the servomotor 4. The sector gear 22 has a central axis parallel to the central axis of the throttle valve shaft 2, and is parallel to the central axis of the throttle valve shaft 2. The torque of the servo motor 4 is transmitted to the throttle valve shaft 2 via an intermediate gear 25 rotatably fitted to an intermediate gear pin shaft 24 driven into the throttle body 1 so as to have a proper center axis. The combination of these gears 22, 23, 25 constitutes a gear reduction mechanism.

When the cover 7 is closed, the electrical connection portions 8a are connected to each other. A storage unit 9 in which the servomotor 4 is stored is provided in the throttle body 1 facing the connection chamber 6.
Is provided, and at least one throttle body 1 (2 in this embodiment) is provided in a part of the throttle body 1 near the entrance of the storage unit 9.
) Is provided with a hole 10a parallel to the center axis of the throttle valve shaft 2. A straight connecting pin 11 is inserted into this hole 10a.
a and the tip of the coupling pin 11a is projected from the hole 10a. Further, a flange 12 is provided in a part of the servomotor 4, and a through hole 13a for positioning the motor is formed in the flange 12 so that the coupling pin 11a is slidably fitted. The servomotor 4 is housed in the housing part 9 while fitting the coupling pin 11a into the through hole 13a, and the screws 26a, 26b, 26
It is fixed by three of c. On the other hand, at a position facing the coupling pin 11a, a fitting hole 1 into which a tip of the pin 11a fits with a projection 18a which is a part of the cover 7 with the cover 7 closed.
4a has been opened. Therefore, the servo motor 4 and the cover 7 can be accurately positioned and fixed with respect to the throttle body 1 by fitting the servo motor 4 and the cover 7 to the coupling pin 11a, and the reduction gears 22, 23, and 25 connected to the servo motor 4 can be provided. Becomes appropriate and stable gear operation can be ensured.

Also, two connecting pins (11a, 11b)
Since the two motors were fitted in the same manner,
And the cover 7 can be uniquely and accurately positioned and fixed without special positioning work with respect to the throttle body 1, and the reduction gear further connected to the servomotor 4 as compared with the case of one coupling pin (11a). The meshing of the gears 22, 23, 25 is stable, and more stable gear operation can be ensured.

As for the electrical connection portions 8a and 8b, the contacts from the servo motor 4 side are the motor side contacts 15
As a and 15b, they protrude from the servomotor 4 in parallel with the central axes of the coupling pins 11a and 11b. Also, the contacts from the cover 7 side are covered with cover terminals 28a, 28b protruding into the cover connector 27 attached to the cover 7.
From the coupling pins 11 as cover side contacts 16a and 16b.
The projections protrude from the cover 7 in parallel with the central axes of the a and 11b. When the cover 7 is closed, the motor-side contacts 15a, 15b and the cover-side contacts 16a, 16b face each other, and the motor contact insertion port 29, which is a part of the cover 7,
The relay terminals 17a and 17b, which are electrically conductive elastic members fixed to the terminals a and 29b, are detachably connected to each other. Therefore, the servomotor 4 and the cover 7 can be accurately positioned and fixed with respect to the throttle body 1, and when the cover 7 is electrically connected to the servomotor 4 at the time of assembling the cover 7, a contact from the servomotor 4 side is formed. The relative displacement of the contacts from the cover 7 provided on the cover 7 is eliminated, and the motor-side contacts 15a, 15
b, damage to the cover-side contacts 16a, 16b and the cover 7 and poor electrical connection of the contacts 15a, 15b, 16a, 16b are eliminated.

The signal line of the throttle sensor 5 is taken out from a connector (not shown) separate from the cover connector 27 integrated with the side surface of the throttle sensor 5.

Next, how to assemble the embodiment of the throttle valve control device shown in FIGS. 1 to 3 will be described.

First, a bearing 20a is attached to the throttle body 1,
Press-fit 20b.

Next, the throttle valve shaft 2 is connected to the bearings 20a, 2a
0b, a throttle sensor 5 is attached to one end of the throttle valve shaft 2, and a sector gear 22 is attached to the other end.
The throttle valve 3 is mounted and fixed substantially in the vicinity of the center with fixing screws 21a and 21b.

Next, in the vicinity of the entrance of the storage portion 9 opened in the throttle body 1, straight coupling pins 1 are inserted into holes 10 a and 10 b formed in parallel with the center axis of the throttle valve shaft 2.
1a and 11b are press-fitted.

The flange 12 of the servomotor 4 having a motor gear 23 press-fitted on a cylindrical motor shaft has:
The connecting pin 11 is parallel to the central axis of the motor gear 23 and
Through holes 13a and 13b are provided so as to be slidably fitted to the outer diameters of a and 11b.

Next, the servo motor 4 is inserted into the housing 9 while the two through holes 13a and 13b formed in the flange 12 are fitted to the two connecting pins 11a and 11b press-fitted into the throttle body 1. Accommodated, three screws 26a,
At 26b and 26c, the throttle body 1 is fixed.

Next, an intermediate gear pin shaft 24 is press-fitted into the throttle body 1 in parallel with the throttle valve shaft 2, and an intermediate gear 25 is rotatably fitted into the intermediate gear pin shaft 24 by a clearance fit, and the sector gear 22 and the motor gear Engage with 23.

Next, two projections 18 provided inside the cover 7 are provided at the tips of the two coupling pins 11a and 11b.
a, fitting holes 14a, 14b at the tip of 18b,
The two connecting pins 11a and 11b are loosely and vertically fitted to the central axes of the two connecting pins 11a and 11b. Then, two conductive relays elastically fitted and fixed to the two cover-side contacts 16a, 16b protruding from the two motor contact insertion ports 29a, 29b provided inside the cover 7 are provided. The two motor-side contacts 15a, 15 are connected to the terminals 17a, 17b.
b is inserted elastically. In this state, the two connecting pins 11a and 11b are tightly fitted until the mating surface of the cover 7 and the throttle body 1 come into contact with each other, and the cover 7 is tightened and fixed with five bolts (not shown). Since the axis is parallel to the throttle valve axis 2,
The meshing of the gears becomes appropriate, and stable gear operation can be ensured, and at the same time, the motor side contacts 15a, 15b
And the relay terminals 17a and 17b are securely inserted, and a stable electric connection is obtained.

[Brief description of the drawings]

FIG. 1 relates to one embodiment of a throttle valve control device of the present invention, and is a front sectional view (II sectional view of FIG. 2) of the throttle valve control device.

FIG. 2 is a right side view of the throttle valve control device according to the embodiment of the present invention, with a cover 7 shown in FIG. 1 being removed.

FIG. 3 relates to an embodiment of the throttle valve control device of the present invention, and is an inner surface near relay terminals 17a, 17b and protrusions 18a, 18b of cover 7 as viewed from the left side in FIG. It is a side front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throttle body 2 Throttle valve shaft 3 Throttle valve 4 Servo motor 5 Throttle sensor 6 Connection chamber 7 Cover 8a, 8b Electrical connection part 9 Storage parts 11a, 11b Connection pin 12 Flange 13a, 13b Through hole 14a, 14b Fitting hole 15a , 15b Second connection part (motor side contact) 16a, 16b First connection part (cover side contact) 17a, 17b Relay terminal

Claims (3)

[Claims] A throttle valve fixed to a throttle valve shaft rotatably supported on a throttle body; and a throttle valve shaft connected to the throttle valve shaft and supported by the throttle body for rotationally adjusting the throttle valve shaft. A servo motor for detecting an adjustment angle of the throttle valve shaft; an electrical connection portion connected to at least the servo motor in a connection chamber; a servo motor provided in the connection chamber; And a cover that closes the connection chamber, and a gear reduction mechanism that reduces the rotational force of the throttle body and transmits the rotation force to the throttle valve, wherein the throttle body is formed on the throttle body facing the connection chamber. The servomotor is housed in a housing, and the throttle is directed from the throttle body toward the connection chamber. A coupling pin protruding in parallel with an axis is provided; the cover is provided with a fitting hole for fixing one end of the coupling pin, and a first coupling portion which is a part of the electrical connection portion is provided; The pin penetrates a through hole formed in a flange of the servomotor, the one end is fitted in the fitting hole provided in the cover, and the first connection portion is provided on the servomotor side. A throttle valve control device, which is detachably connected to a second connection portion which is another portion of the dynamic connection portion. 2. The throttle valve control device according to claim 1, wherein two connecting pins are provided and fitted in the same manner. 3. With respect to the electrical connection portion, a contact from the servo motor side is projected from the servo motor as the second connection portion in parallel with a center axis of the coupling pin, and a contact from the cover side is When the cover is closed as the first connection portion, the cover protrudes from the cover in parallel with the center axis of the coupling pin. When the cover is closed, the second connection portion and the first connection portion face each other. 3. The throttle valve control according to claim 1, wherein the relay terminal is an electrically conductive elastic member fixed to a part of the cover, and the relay terminal is elastically connected to the relay terminal. apparatus.