JPS62203934A - Electrical throttle valve opening controller - Google Patents

Abstract

PURPOSE:To prevent malcontrols owing to the lock of a gear, in an apparatus which controls the opening of a throttle valve with a motor via a speed reducing mechanism, by restricting a gap between the axis of the output shaft of a motor and the rotational center of a reduction gear not to become less than a prescribed value. CONSTITUTION:When an accelerator 9 is pressed, an accelerator opening detector 8 detects the pressing condition of the accelerator and input it to a control circuit 6. Then, the control circuit 6 drives and controls a stepping motor 5 so as to close and control a throttle valve 2 via a throttle axis 3. And the throttle valve 2 is connected with the output shaft 11 of the motor 5 by a gear 10. In this case, a bracket 17 is provided for an assembly body 1, and a screw 14 is provided for the bracket 17. And when the motor 5 is assembled, an adjusting portion 12b which is provided for the bracket 12 of the motor 5 is pressed by the screw 14, and the screw 14 is fixed by a nut 15 after the screw 14 is adjusted so as to eliminate the dislocation of the motor 5. Thus, a gap between the gear 10 and the output shaft 11 is sufficiently ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve opening control device for an internal combustion engine. The present invention relates to a device for controlling temperature.

[Conventional technology]

This type of device uses a motor to electrically control the opening of the throttle valve.
Japanese Patent Publication No. 58-25853 or U.S. Patent No. 42
It is well known from the specification of No. 12272, etc. Conventional devices of this type use gears as means for interlocking the output shaft of the motor and the throttle valve shaft.

That is, a gear is attached to the output shaft of the motor, and the throttle valve shaft is operated via a reduction mechanism having a gear that meshes with the gear.

[Problem that the invention seeks to solve]

In the conventional electric throttle valve opening control device described above, when the motor is fixed to the body where the throttle valve is installed, variations in the dimensional accuracy of the fixing point and the accuracy of the positional relationship between the output shaft of the motor and the reduction mechanism However, there was a problem in that the gear attached to the motor was pressed against the gear of the reduction mechanism, causing both gears to become jammed and locked.

If a lock occurs while the vehicle is in motion, the vehicle may become uncontrollable, leading to a serious accident.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a device of this type in which the gears of the motor and the gears of the speed reduction mechanism are prevented from being unnecessarily close to each other, and accidents caused by locking of the gears do not occur. .

[Means for solving problems]

The above object is achieved by providing a distance regulating means for regulating the distance between the shaft of the motor and the rotating shaft of the gear of the reduction mechanism to a predetermined value or more.

[Effect]

When the motor is fixed to the body to which the throttle valve is attached, the gear attached to the motor may not reach a certain value to the gear of the reducer due to variations in the dimensions of the fixed parts and variations in the positional relationship between the reduction mechanism and the motor shaft. If an attempt is made to approach beyond the distance, the spacing regulating means will prevent this and prevent locking.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Conventionally, when the accelerator 9 is stepped on, the throttle valve 2 can be freely moved by a link mechanism (not shown in the drawings of the present invention) linked to the accelerator. However, in order to maximize the engine's output, it became necessary to electrically control the opening and closing of the throttle valve and operate it in synchronization with the engine's rotation speed. For this reason, when the accelerator 9 is stepped on, the accelerator opening degree detector 8 senses the accelerator depression state by the driver 7 and inputs it to the control circuit 6. The control circuit 6 determines the accelerator pedal depression status of the driver 7, instructs the stepping motor 5 (hereinafter referred to as motor 5), and transmits the instruction to the throttle valve shaft 3 incorporated in the throttle valve assembly 1, and controls the throttle valve. Control 2. At this time, a throttle valve detection device 4 is provided to confirm the operating position of the throttle valve 2. The throttle valve 2 that controls the engine speed is the output shaft 11 of the motor 5.
Since the motor 5 is connected and controlled by the gear 10, the motor 5
The mounting dimensions of the throttle valve assembly must be precisely controlled and strictly controlled.

However, in order to attach the gear 1o to the throttle valve shaft 3, it is necessary to make the coaxiality of the output shaft 11 of the motor 5 and the motor 5 highly accurate. As a means to improve the accuracy, generally a protrusion 12a is provided on the bracket 12 that holds the motor 5, a groove 1a of the other throttle valve assembly 1 is manufactured with a fitting tolerance, and the protrusion 12a is inserted therein. The positions of the gear 10 attached to the output shaft 11 of the motor 5 and the throttle valve shaft 3 are maintained correctly. However, as the gear 10 becomes larger, the outer circumference of the groove 1a of the throttle valve assembly decreases relatively, and the motor moves beyond the fit tolerance of the guide section of the motor protrusion 12a.As a result, as shown by the dotted line in FIG. Motor 5 is out of alignment. gear 10
If the gap exceeds the allowable value, the output shaft 11 of the motor 5 will bite into the gear 1°, resulting in unsmooth operation. In the worst case, it will lock up.

In order to prevent this, the embodiment shown in FIG. 4 is provided with a highly rigid bracket 1-17 on the assembly main body 1.
7 is provided with a screw 14, and the tip of the screw is connected to the adjustment part 12b provided on the motor bracket 12 when the motor is assembled.
Press and adjust the screw 14 to eliminate the displacement of the motor shown in FIG. 3. After adjustment, fix with the nut 15. At this time, the motor is installed in a position such that it is not pushed toward the gear 10.

FIG. 5 shows another embodiment, in which a spring is provided in place of the screw, and the pushing force of the spring prevents the gear from always moving toward the gear.

In this embodiment, an external part is added to the stepping motor to forcibly press the protrusion of the guide part. In addition to these embodiments, for example, a method of moving a lever provided with an eccentric pin may also be considered.

As explained in the examples above, in the conventional technology, when the engine is operating and the distance between the shafts becomes short due to engine vibration, the S/M locks and stops operating, and the throttle valve remains locked. In order to supply the amount of air to the engine, a problem arises in that the engine speed does not reach idle speed.

In general, motors that require precision such as center-to-center distance must have a guide part that has a fitting tolerance with the other side. In the case of a throttle valve assembly in which another mechanism (in this case, a throttle link) is also installed on the guide part depending on the fit-eye tolerance, it is difficult to secure the guide part completely, and this consideration has not been taken. Ta.

According to these embodiments, one end of the motor is forcibly pushed in the direction away from the side of the deceleration ia by a screw or spring, so that the distance between the shafts becomes narrow and the gears do not interfere with each other and malfunction occurs. can be secured sufficiently.

Furthermore, in order to reduce the distance between the motor shaft and the throttle valve shaft of the throttle valve assembly and to ensure smooth operation, one end of the motor is fixed to the assembly body and a rigid lever or assembly body is used. It is also possible to put a screw in the part that is integrally molded and push it directly with this screw. Also, in consideration of engine vibration, the dimensional accuracy of the center distance can be improved by using a spring that has a relatively high spring constant and is removed from the resonant frequency of the engine. It becomes possible to fit within the fit-eye tolerance determined at the initial stage of the guiding part.

〔Effect of the invention〕

According to the present invention, the distance regulating means allows a sufficient distance V8 between the gear of the reducer and the output shaft of the motor.
This eliminates the problem of the two locking together and making it impossible to control the throttle valve.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view of the structure of the present invention, FIG. 2 is an external perspective view thereof, FIG. 3 is a diagram showing the attachment relationship between the gears used in this embodiment and the motor output shaft, and FIG. FIG. 5 is an external perspective view showing another embodiment of the present invention. 1... Throttle valve assembly, 2... Throttle valve, 3... Throttle valve shaft,
4... Throttle valve opening detector, 5... Stepping motor, 6... Control circuit, 7... Driver, 8... Accelerator opening detector. 9...Accelerator pedal, 10...Gear, 11...
Output shaft of stepping motor, 12...bracket.

Claims (1)

[Scope of Claims] 1. A reduction mechanism comprising a motor driven by an electric signal corresponding to the amount of depression of an accelerator pedal, a gear attached to the output shaft of the motor, a reduction gear meshing with the gear, and a reduction gear of the reduction mechanism. In a device equipped with a throttle valve whose opening degree is controlled according to the movement of the output shaft, the dimension between the axis of the output shaft of the motor and the rotation center of the reduction gear does not fall below a predetermined value. An electrically operated throttle valve opening control device characterized in that an interval regulating means is provided. 2. In the invention set forth in claim 1, the interval regulating means includes means for applying a force to the output shaft of the motor in a direction away from the reduction gear, and the motor itself is controlled by the throttle valve. An electric throttle valve opening degree control device, characterized in that the operation of fixing the attached device to the body is performed under the action of the above-mentioned force.