JPH11294204A - Throttle valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent resin gears from seizing by doing away with backlash of an axis direction of an intermediate gear or a gear at final reduction stage, reducing abrasion of a gear caused by engine vibration, and improving the accuracy of a throttle valve opening control. SOLUTION: A motor 1 rotates by a signal from CPU. Rotation of the motor 1 is transmitted from a pinion 2 of an output shaft of the motor 1 to an intermediate gear of a countershaft 3. The intermediate gear is composed of a wheel 4 engaging in the pinion 2, and a pinion 5, which is energized to left by a spring washer 15 so as to do away with axis direction backlash. Rotation of the pinion 5 is transmitted to a wheel 7 of a throttle shaft 6. A spring washer 20 energizes the throttle shaft 6 to left so as to do away with the axis direction backlash of the wheel 7. Each pinion and each wheel is made of a resin and engages in a glassed 66 nylon and an aromatic nylon. Power of the spring washer 20 is stronger than that of the spring washer 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a throttle valve control device for driving a throttle valve with a motor.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 63-191249 discloses a throttle actuator provided with a control device for adjusting the opening of a throttle valve to a required value.

In this prior art, the rotation of an output shaft of a motor as an actuator is transmitted from a gear of the output shaft to a gear of a transmission shaft via an intermediate gear provided on the intermediate shaft, and the transmission shaft and the throttle shaft are connected by a joint. Are engaged.

[0004] The rotation of the output shaft of the motor is transmitted to the throttle shaft through meshing of two sets of gears.

[0005]

In the above prior art,
There is a play in the axial direction of the gear provided on the intermediate shaft and the gear provided on the transmission shaft. If the gears vibrate and wear due to engine vibration, it becomes difficult to precisely control the valve opening. There was a point. Further, when the gear is made of resin, there is a problem that seizure easily occurs due to operation.

Accordingly, it is an object of the present invention to provide a throttle valve control device which can solve these problems.

[0007]

According to a first aspect of the present invention, there is provided a control device for adjusting a valve opening by reducing the rotation of a motor by a gear and transmitting the rotation to a throttle shaft. A first spring washer that eliminates axial play of a gear provided on an intermediate shaft disposed between the output shaft and the throttle shaft, and a second spring washer that eliminates axial play of a gear provided on the throttle shaft. And a throttle valve control device.

According to a second aspect of the present invention, in the throttle valve control device of the first aspect, the force of the second spring washer is made larger than the force of the first spring washer.

According to a third aspect of the present invention, in the throttle valve control device according to the first or second aspect, the gears provided on the output shaft, the intermediate shaft, and the throttle shaft of the motor are made of resin and have different properties from each other. It is characterized by being engaged with a resin.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. The rotation of the drive motor 1 that rotates upon receiving a signal from an ECU (electronic control unit) at the request of the engine (not shown)
A pinion (small gear) 2 provided on the output shaft, a large gear 4 and a pinion (small gear) 5 provided on the intermediate shaft 3, and a throttle shaft 6.
Is transmitted to the required speed via a large gear 7 provided on the throttle shaft 6 and a throttle arm 8 having a U-shaped cross section.
And a relief spring 9 opens and closes a throttle valve 10 which rotates integrally.

The large gear 7 is formed in a sector gear shape.
The collar 11 is insert molded and the throttle shaft 6
To be rotatable. The pinion 2 and the large gear 7 are formed of 66 nylon with glass, and the large gear 4 and the pinion 5 are integrally formed of aromatic nylon. This is to prevent seizure due to meshing between nylon gears.

One end of the intermediate shaft 3 is fixedly press-fitted to the body 12 and a stopper 13 is press-fitted to the other end. The large gear 4 and the pinion 5 are integrally formed as described above to constitute an intermediate gear. This intermediate gear rotatably engages with the intermediate shaft 3.

A shim (plate) 14 fitted to the intermediate shaft 3 and a spring washer 15 are inserted between the intermediate gear and the body 12, and the spring washer 15 serves as an intermediate gear shown in FIGS. It is biased to the left. As the spring washer 15, a wave washer is used, and one end of the intermediate gear is always in contact with the stopper 13. By doing so, the axial direction of the intermediate gear is eliminated.

16 is an oil seal, 17 is a cage, 18
Is a ball bearing. A ball bearing 18 is pressed into the throttle shaft 6, and a spring washer 2 made of a wave washer is provided between the ball bearing 18 and the retainer 17.
By inserting 0 and pressing the retainer 17 into the body 12, the throttle shaft 6 integrated with the inner ring of the bearing 18 is urged in the axial direction (to the left in FIGS. 1 and 4). By assembling the large gear 7 connected to the throttle arm 8 with a relief spring 9, the axial direction of the large gear 7 is eliminated by one piece 8 a of the throttle arm 8.

Reference numeral 21 denotes another ball bearing (fitted to the throttle shaft 6) for supporting the throttle shaft 6, reference numeral 22 denotes an oil seal, and reference numeral 23 denotes a back spring, which are well known.

Intermediate gear (pinion 5) caused by engine vibration
The axial vibration of the gear 4) is suppressed by the spring washer 15. Further, axial vibration of the large gear 7 due to engine vibration is suppressed by the spring washer 20.

The large gear 7 tends to vibrate integrally with the throttle shaft 6, the throttle valve 10, and the like. However, since the total mass that tends to vibrate integrally is much larger than that of the intermediate gear, The force of the spring washer 20 for suppressing the vibration is set to be larger than the force of the spring washer 15 so that the vibration caused by the backlash is reliably eliminated. Also, 66
Since resin gears such as nylon are meshed with materials having different properties, seizure due to operation is eliminated.

[0018]

Since the throttle valve control device of the present invention is constructed as described above, it is possible to absorb the axial play of the intermediate gear and the large gear, thereby eliminating the relative vibration of the gear due to engine vibration. Therefore, wear of gears due to engine vibration can be reduced, and generation of vibration noise can be suppressed. And the accuracy of valve opening control can be improved.

According to the second aspect of the present invention, the backlash on the throttle valve side having a large mass can be reliably absorbed.
The axial play can be sufficiently absorbed without unnecessarily increasing the strength of the spring washer for absorbing the play of the small intermediate gear.

Further, according to the third aspect of the present invention, the weight of the gears can be reduced, the play in the axial direction can be effectively suppressed, and sticking due to seizure between the resin gears can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a side view of a main part of the embodiment of FIG. 1;

FIG. 3 is a partially enlarged view of the embodiment of FIG. 1;

FIG. 4 is an enlarged view of another part of the embodiment of FIG. 1;

5A and 5B are spring washers used in FIG. 4, wherein FIG. 5A is a front view and FIG. 5B is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Pinion 3 Intermediate shaft 4 Large gear 5 Pinion (small gear) 6 Throttle shaft 7 Large gear 10 Throttle valve 12 Body 15 First spring washer 18 Ball bearing 20 Second spring washer

Claims (3)

[Claims] 1. A control device for adjusting the valve opening by transmitting the rotation of a motor to a throttle shaft by decelerating the rotation of the motor by a gear, wherein a gear provided on an intermediate shaft disposed between an output shaft of the motor and the throttle shaft is provided. A first spring washer for eliminating axial play,
A throttle valve control device comprising: a second spring washer that eliminates play in the axial direction of a gear provided on a throttle shaft. 2. The throttle valve control device according to claim 1, wherein the force of the second spring washer is made larger than the force of the first spring washer. 3. A gear provided on an output shaft, an intermediate shaft and a throttle shaft of a motor is made of resin, and is meshed with resins having different properties from each other.
The throttle valve control device according to any one of the preceding claims.