KR950004963B1 - Motor-driven throttle valve assembly - Google Patents

Abstract

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Description

Throttle Valve Assembly for Electric Driven Throttle Valve

1 is a partial cross-sectional view of a throttle valve assembly according to an embodiment of the present invention, showing a restricting member installed inside the throttle valve assembly for restricting rotation of the throttle valve shaft with respect to the closed position.

FIG. 2 is a partially enlarged view of FIG. 1 showing the regulating member and the adjusting screw. FIG.

3 is a partial cross-sectional view of a throttle valve assembly according to another embodiment of the present invention, showing a restricting member installed outside the throttle valve assembly.

The present invention relates to a throttle valve assembly for an internal combustion engine, and more particularly, to a throttle valve assembly for a motor-driven throttle valve for controlling the opening and closing degree of a throttle valve by the rotational output of the motor.

This type of conventional device disclosed in Japanese Patent Application Publication No. 1983-25853, entitled "Throttle Valve of Internal Combustion Engine," issued on May 30, 1983, amplifies the torque of an electric motor with a gear to produce a throttle valve. Passing on.

Since the conventional throttle valve assembly is configured in this manner, when the throttle valve is rotated to the fully closed position, the throttle valve is driven to the fully closed position by a strong force by the rotational inertia force of the motor, and the throttle valve is moved to the wall side of the intake cylinder. There was a problem digging in.

An object of the present invention is to provide a throttle valve assembly for an electric motor-driven throttle valve which can prevent the throttle valve from penetrating into the inner wall of the throttle valve intake cylinder in the fully closed position.

The present invention is characterized in that a restricting member is installed on the throttle valve shaft to restrict the rotation of the throttle valve to the fully closed position.

That is, the throttle valve assembly for the electric motor-driven throttle valve of the present invention is rotatably supported by the throttle valve housing (1) and the throttle valve housing (1) having an air suction passage therein, and penetrates the air suction passage. A throttle valve shaft (3) fixed to the throttle valve shaft (3), an throttle valve (2) for adjusting the amount of air flowing through the air stop passage, and the throttle valve shaft in a closing direction of the throttle valve A return spring 13 for imparting rotational force to rotate, an electric motor 5 for rotationally driving the throttle valve shaft 3 to open and close the throttle valve 2 according to the stepping amount of the accelerator pedal 9, and the A gear 10 provided between the output shaft 11 of the electric motor 5 and the throttle valve shaft 3 in order to reduce the rotation of the electric motor 5 and transmit it to the throttle valve shaft 3, A gear housing 1a accommodating the gear 10; Regulating member 14, which is operated together with the rotation of the throttle valve shaft 3, and the regulating member 14 when the throttle valve 2 is in a fully closed state. A throttle valve assembly for a motor-driven throttle valve having a stop member (12) which mechanically maintains the opening and closing position at a predetermined value, wherein the stop member (12) and the regulating member (14) are connected to the throttle valve ( 2) the gear housing portion 1a which is balanced on the side of the gear 10 and houses the gear 10 therein is integrally formed therewith as a part of the throttle valve housing 1, and The stop member 12 is characterized in that mounted on the gear housing (1a).

According to the present invention, when the throttle valve is diffracted in the closed position direction, its rotation is prevented shortly before being closed by the action of the regulating member, and as a result, the throttle valve is prevented from penetrating into the wall surface of the throttle valve intake cylinder.

Next, an embodiment of the present invention will be described with reference to FIG. When the accelerator pedal 9 is stepped on, the accelerator opening / closing detector 8 which is an accelerator operation amount detection means detects the driver who presses the accelerator pedal of the driver 7 and inputs a signal to the control circuit 6 through the means 19. . The control circuit 6 judges the intention of the driver 7 by the means 19, sends an instruction through the means 23 to the stepping motor 5 which is an electric motor, rotates it, and rotates the rotation of the throttle valve assembly. The throttle valve 2 is controlled by transmitting to the throttle valve shaft 3 built in the housing 1.

At this time, the throttle valve opening and closing detection device 4, which is a throttle valve opening and closing detection means, is installed in order to confirm the operating position of the throttle valve 2. This detection device 4 sends a failsafe signal to the control circuit 6 via means 24. The throttle valve 2 which controls the rotation speed of an engine is connected to the output shaft 11 of the stepping motor 5 and the gear 10, and is also controlled.

In general, the output shaft 11 of the stepping motor and the throttle valve shaft 3 are connected via the gear 10 on the way. The gear 10 is part of the housing 1 and is stored in the gear housing portion 1a integrally formed therewith. Since the throttle valve does not return to the idle state due to the rotational force generated in the stepping motor 5, a feedback spring 13 is provided to overwhelm this rotational force. In addition, the regulating plate 14, which serves as a regulating member fixed to the portion 20 of the throttle valve shaft 3, adjusts the role of the stop member so that the throttle vane can be idled by the return spring 13. It is supported by a screw 12. The adjusting screw 12 is part of the housing 1, and is mounted on the side where the gear housing portion 1a is formed. When the vehicle is decelerated, the throttle valve shaft 3 is rotated to the closed position with a strong force due to the inertia of the motor. When the vehicle is decelerated and the throttle valve is returned by the electric motor to a specific idle position, for example, 1 ° open position from the fully closed position, the end portion 18 of the regulating member 14 is attached to the housing 1 of the throttle valve assembly. Contact the end 17 of the adjustment screw 12. Therefore, further rotation of the throttle valve due to inertia is prevented, and the throttle valve is prevented from penetrating into the inner wall of the intake cylinder.

What is important here is that the position of the regulating member 14 and the position of the gear 10 are installed in close proximity. Accordingly, when the regulating member 14 is in contact with the adjusting screw 12, and the regulating member is formed in the throttle valve shaft portion on the other bearing side opposite to the motor, a torsion force is generated in the throttle valve shaft 3. Therefore, a phenomenon occurs in which the throttle valve shaft 3 is broken or bent, or the throttle valve penetrates into the intake cylinder inner wall.

However, according to the present invention, since the regulating member 14 is provided between the bearing 16 and the gear 10 of the electric motor side, the throttle valve shaft 3 even if the regulating member 14 is in contact with the adjusting screw 12. There is no torsional force.

As described above, in the throttle valve assembly for the electric motor-driven throttle valve of the present invention, the stop member 12 and the regulating member 14 are disposed on the side of the gear 10 with respect to the throttle valve 2, and the inside thereof is disposed. The gear housing portion 1a for accommodating the gear 10 is integrally molded with the gear housing portion 1a as part of the throttle valve housing 1, and the stop member 12 is attached to the gear housing portion 1a.

It is assumed that a conventional throttle valve is used under the following conditions.

(1) When an electric motor constituted by a stepping motor or a direct current motor rotates, energy of the electric motor is transmitted to the electric motor shaft. Energy transmitted to the motor shaft is transmitted to the throttle valve shaft through the reduction gear mechanism.

(2) It is necessary to narrow the gap as much as possible between the throttle valve and the air flow wall to reduce the amount of air leaking from the gap between the throttle valve and the air flow wall. The opening and closing degree of the throttle valve is set to about 1 ° from the fully closed state.

(3) The regulating member is located on the other side where the motor is not installed and is installed near the return spring so as to overwhelm the torque of the motor.

In the case of using a throttle valve assembly that satisfies the above conditions (1) to (3), the motor of the throttle valve shaft is moved through the reduction gear mechanism by the moment of inertia of the motor (this moment acts in the direction of closing the throttle valve). It is stopped by the regulating member installed on the side not attached. At this time, a torsion force is generated in the throttle valve, and a torsion force is also generated in the portion where the throttle valve is attached. At this time, the gap between the throttle valve and the air flow wall is not only narrowed as described in paragraph (2) above, but also the gap between the throttle valve and the air flow wall is narrowed in proportion to the torsional force of the throttle valve. The throttle valve comes into contact with the airflow wall and digs into the airflow wall.

In the present invention, in order to solve the above-mentioned drawback, that is, the restricting member is provided on the motor 5 side from the end of the throttle valve 2 so that the torsion in the throttle valve 2 is not generated by the moment of inertia of the motor 5. Install.

In order to reduce the wear of the adjusting screw 12 and the regulating member 14, the surface may be hardened by quenching, or the like, and the abrasive member assembly may be installed inside the throttle valve assembly as shown in FIG. have. When abrasion powder is generated by the contact between the regulating member and the screw, metal powder enters the gear 10, which adversely affects the operation of the gear. Therefore, even if the regulating member assembly is installed outside the throttle valve assembly, as shown in FIG. good. In addition, the effect is the same even if a motor such as a DC motor or a pulse motor having an inertia force other than a stepping motor is used as the motor.

As shown in FIG. 2, the projection 25 of the adjusting screw 12 has a screw groove 22 so that the screw 12 moves back and forth through the housing 1 of the throttle valve assembly when the screw 12 is rotated. The plate can be positioned with high precision.

As described above, according to the throttle valve assembly for the electric motor-driven throttle valve of the present invention, when the throttle valve is rotated, its rotation is prevented shortly before being closed by the action of the restricting member, and the throttle valve is the throttle valve intake cylinder. It can be prevented from digging into the wall of the house.

Claims (5)

A throttle valve housing (1) having an air suction passage therein, a throttle valve shaft (3) rotatably supported by the throttle valve housing (1) and passing through the air suction passage, and the throttle valve shaft (3). Fixed to the throttle valve (2) for adjusting the amount of air flowing through the air suction passage, a return spring (13) for imparting a rotational force for rotating the throttle valve shaft in the closing direction of the throttle valve, and an accelerator pedal ( 9) the motor 5 for rotating and driving the throttle valve shaft 3 to open and close the throttle valve 2 according to the stepped amount, and the rotation of the motor 5 is decelerated to reduce the throttle valve shaft 3. Gear 10 provided between the output shaft 11 of the electric motor 5 and the throttle valve shaft 3, a gear housing 1a for receiving the gear 10, A regulating member 14 operating together with the rotation of the throttle valve shaft 3, and An electric motor driven type having a stop member 12 that engages with the regulating member 14 when the throttle valve 2 is approximately closed, and mechanically maintains the opening and closing position of the throttle valve 2 to a predetermined value. In a throttle valve assembly for a throttle valve, the stop member 12 and the regulating member 14 are disposed on the side of the gear 10 with respect to the throttle valve 2, and the gear 10 is disposed therein. An electrically driven throttle characterized in that the gear housing portion 1a to be accommodated is integrally molded as part of the throttle valve housing 1, and the stop member 12 is mounted to the gear housing portion 1a. Throttle valve assembly for valve. 2. The motor-driven throttle valve according to claim 1, wherein the restricting member (14) is provided on the throttle valve shaft (3) on the side of the motor (5) with respect to the throttle valve (2). Throttle Valve Assembly 3. The regulating member (14) according to claim 2, wherein said regulating member (14) is a regulating plate mounted on said throttle valve shaft (3), and said stop member (12) is said regulating when said throttle valve (2) is in a substantially closed state. A throttle valve assembly for an electric motor-driven throttle valve, characterized in that it comprises an adjustable screw (12) mounted to the gear housing (1a) to engage the plate (14). A control circuit 6 connected to the electric motor 5, an accelerator operation amount detection means 8 for detecting an operation amount of an accelerator pedal 9 by a driver, and the accelerator operation detection means (2). A throttle valve assembly for an electric motor-driven throttle valve, characterized in that it has a means (19) for supplying the output of 8) to said control circuit (6). 5. The control circuit (6) according to claim 4, further comprising an output of the throttle valve opening and closing detection means (4) for detecting the opening and closing degree of the throttle valve (2) and the throttle valve opening and closing detection means (4). A throttle valve assembly for an electric motor-driven throttle valve, characterized by having a supply unit (24).