JP2020079568A - Intake air quantity control device - Google Patents

Abstract

To miniaturize and firmly integrate a throttle lever and an adjustment arm.SOLUTION: An intake air quantity control device 10 includes a throttle body 12 having an intake passage 11, a valve shaft 13 rotatably disposed on the throttle body 12, a butterfly-type throttle valve 14 fixed to the valve shaft 13, and opening and closing the intake passage 11, a drum-type throttle lever 15 disposed on one end portion 13a of the valve shaft 13, and a return spring 16 of a torsional coil spring, wound on the valve shaft 13, disposed between the throttle body 12 and the throttle lever 15, and energizing the throttle lever 15. The throttle lever 15 is composed of a resin molding having an adjustment arm 20 for adjusting an idle opening of the throttle valve 14. The adjustment arm 20 is composed of a metallic plate having a bent anchor portion 22, and insert-molded to the throttle lever 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intake air amount control device for an engine.

  An intake air amount control device for an engine is known from Patent Document 1, for example. The intake air amount control device disclosed in Patent Document 1 has a configuration in which a drum-type throttle lever is provided at one end of a valve shaft having a butterfly-type throttle valve. The throttle lever is connected to the throttle grip of the motorcycle by a wire cable. Further, the throttle lever has an adjusting arm for adjusting the idle opening degree of the throttle valve.

  Generally, such a throttle lever and an adjusting arm are integrated by a combination of two metal plates. However, the combined structure of metal plates requires a large number of manufacturing steps, and there is room for improvement in order to reduce costs. Therefore, it is conceivable that the throttle lever and the adjusting arm are integrally molded with resin. However, in order to secure the strength, it is inevitable to increase the size of the resin molded product alone. Therefore, there is room for improvement in order to downsize the intake air amount control device while ensuring the space for arranging the return spring.

  In order to solve this problem, it is possible to adopt the technique of Patent Document 2. The throttle valve lever having the fuel flow rate adjusting function disclosed in Patent Document 2 is a resin molded product, and a metal reinforcing plate is insert-molded inside. By adopting the technique of Patent Document 2, for example, a configuration in which a metal adjustment arm is insert-molded to a resin throttle lever can be considered. However, if the insert molding is simply performed, there is a concern that a part of the resin-made throttle lever in which the adjustment arm is embedded may be peeled off. There is a problem from the viewpoint of firmly integrating the resin throttle lever and the adjusting arm.

JP, 2010-223049, A JP, 2001-012304, A

  It is an object of the present invention to provide a technique capable of compactly and firmly integrating a throttle lever and an adjusting arm, and also miniaturizing an intake air amount control device.

The intake air amount control device of the present invention,
A throttle body having an intake passage,
A valve shaft rotatably provided on the throttle body,
A butterfly-type throttle valve fixed to this valve shaft to open and close the intake passage;
A drum type throttle lever provided at one end of the valve shaft,
And a return spring made of a torsion coil spring, which is wound around the valve shaft, is interposed between the throttle body and the throttle lever, and biases the throttle lever in a direction to close the throttle valve. ,
The throttle lever has an adjustment arm for adjusting the idle opening degree of the throttle valve,
The throttle lever is a resin molded product,
The adjusting arm is formed of a metal plate having a bent anchor portion, and is insert-molded on the throttle lever.

  In the present invention, the adjustment arm formed of the metal plate having the bent anchor portion is insert-molded on the resin throttle lever. Since the anchor portion is embedded in the resin throttle lever, the adjusting arm can be firmly embedded in the resin throttle lever. Moreover, the adjustment arm (including the anchor portion) embedded in the resin throttle lever also serves as a reinforcing member for the resin portion. Therefore, the resin portion can be downsized. Therefore, the throttle lever and the adjusting arm can be made compact and strong. As a result, it is possible to reduce the size of the intake air amount control device while ensuring the space for arranging the return spring.

It is sectional drawing which abbreviate|omitted a part of intake amount control apparatus by this invention. FIG. 3 is a perspective view of a throttle lever and an adjustment arm shown in FIG. 1.

  A mode for carrying out the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the intake air amount control device 10 controls the combustion intake air amount of an engine of a motorcycle. The intake air amount control device 10 includes a throttle body 12 having an intake passage 11, a valve shaft 13 rotatably provided in the throttle body 12, and a throttle body fixed to the throttle shaft 13 to open and close the intake passage 11. A valve 14, a throttle lever 15 provided at one end 13a of the valve shaft 13, and a return spring 16 that biases the throttle lever 15 in the rotational direction are provided.

  The throttle valve 14 is a butterfly type valve that can rotate together with the valve shaft 13. The throttle lever 15 has a drum-type structure that is rotatable together with the valve shaft 13, and is connected to a throttle grip of a motorcycle by a wire cable 17. The return spring 16 is made of a torsion coil spring, is wound around the valve shaft 13, is interposed between the throttle body 12 and the throttle lever 15, and is provided with the throttle lever 15 in a direction to close the throttle valve 14. Energize.

  Hereinafter, the throttle lever 15 will be described in detail with reference to FIGS. 1 and 2. The throttle lever 15 is a resin molded product and has an adjusting arm 20. The adjusting arm 20 is for adjusting the idle opening degree of the throttle valve 14. More specifically, the adjustment arm 20 is made of a metal plate and includes a base portion 21, an anchor portion 22, and an arm portion 23.

  The base portion 21 has a substantially flat plate shape, and the plate surface thereof is superposed and fixed on the tip end surface of the one end portion 13 a of the valve shaft 13. The anchor portion 22 is bent from a part of the outer periphery of the base portion 21 to the side opposite to the valve shaft 13. The anchor portion 22 further extends in the rotation direction of the adjustment arm 20 from the bent tip. That is, the anchor portion 22 has a substantially L shape (see FIG. 2) when viewed in the radial direction of the valve shaft 13.

  The arm portion 23 is bent from the outer periphery of the base portion 21 toward the throttle body 12. That is, a part of the base portion 21 extends in the radial direction from the outer peripheral surface of the throttle lever 15, and the arm portion 23 extends from the tip end thereof toward the throttle body 12 along the valve shaft 13. A movable stopper 24 is formed at the tip of the arm portion 23. The movable stopper 24 is a portion bent from the tip of the arm portion 23 so that the plate surface faces the rotation direction.

  A fixed stopper 31 extending from the throttle body 12 toward the throttle lever 15 is located on the rotation trajectory of the movable stopper 24. An adjusting bolt 32 is screwed into the fixed stopper 31 so as to be able to move forward and backward toward the movable stopper 24. By adjusting the adjustment bolt 32 to move back and forth, the rotational displacement angle of the movable stopper 24, that is, the rotational displacement angle of the throttle lever 15 can be adjusted. As a result, the idle opening degree of the throttle valve 14 can be adjusted. The adjusting arm 20, the fixed stopper 31, and the adjusting bolt 32 constitute an idle adjusting mechanism 30.

  The adjustment arm 20 is insert-molded on the resin throttle lever 15. As a result, the throttle lever 15 and the adjusting arm 20 are integrated. More specifically, a portion of the base portion 21 of the adjusting arm 20 that is fixed to the valve shaft 13 is exposed to the resin throttle lever 15 without being insert-molded. By fixing the base portion 21 to the valve shaft 13, the throttle lever 15 is fixed to the valve shaft 13.

  Since the anchor portion 22 is embedded in the resin throttle lever 15, the adjustment arm 20 can be firmly embedded in the resin throttle lever 15. There is no fear that a part of the resin-made throttle lever 15 in which the adjusting arm 20 is embedded is peeled off. Moreover, the adjusting arm 20 (including the anchor portion 22) embedded in the resin throttle lever 15 also serves as a reinforcing member for the resin portion. In particular, since the anchor portion 22 has a substantially L-shape when viewed from the radial direction of the valve shaft 13, the anchor portion 22 fully digs into the resin throttle lever 15 in the axial direction and the radial direction. Therefore, the thickness Th (thickness Th in the axial direction) of the throttle lever 15 can be reduced. That is, the resin portion can be downsized. The throttle lever 15 and the adjusting arm 20 can be made compact and strong.

  As a result, while securing the arrangement space of the return spring 16 (range of the set length L1 of the return spring 16) shown in FIG. 1, from the center of the intake passage 11 to the wire winding groove center of the throttle lever 15 (so-called wire The length L2 up to the line) can be reduced. Therefore, the intake air amount control device 10 can be downsized.

  The intake air amount control device 10 of the present invention is suitable for use in an engine of a motorcycle.

  10... Intake amount control device, 11... Intake passage, 12... Throttle body, 13... Valve shaft, 13a... One end part, 14... Throttle valve, 15... Throttle lever, 16... Return spring, 17... Wire cable, 20... Adjustment Arm, 22... Anchor part, 23... Arm part.

Claims (1)

A throttle body having an intake passage,
A valve shaft rotatably provided on the throttle body,
A butterfly-type throttle valve fixed to the valve shaft to open and close the intake passage,
A drum type throttle lever provided at one end of the valve shaft,
A return spring made of a torsion coil spring, which is wound around the valve shaft, is interposed between the throttle body and the throttle lever, and biases the throttle lever in a direction to close the throttle valve. ,
In the intake air amount control device, the throttle lever has an adjustment arm for adjusting the idle opening degree of the throttle valve,
The throttle lever is a resin molded product,
The intake air amount control device, wherein the adjusting arm is formed of a metal plate having a bent anchor portion, and is insert-molded on the throttle lever.

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