JPH0343632A - Suction throttle valve opening/closing device of internal combustion engine - Google Patents

Abstract

PURPOSE:To downsize both levers, and to reduce a rotating region by pivotally supporting a relay lever on a periphery of a relay shaft fixed on a throttle valve main body, and by arranging a throttle valve provided with a throttle valve opening/closing lever on the inside of the relay shaft. CONSTITUTION:On an external end of a throttle valve shaft 2 rotating freely on a throttle valve main body 1, a throttle valve opening/closing lever 3 is fixed by a nut 26. On a bottomed hole formed on a boss part of the throttle valve main body 1, a relay shaft 4 is fixed by a screw. On a periphery of the relay shaft 4, a relay lever 5 is supported rotating freely. According to the applying of an accelerator pedal, the relay lever 5 is rotated in an A direction, while the throttle valve opening/closing lever 3 and the throttle valve shaft 2 are rotated through a cam groove 32 that abuts on a roller 53 provided on an arm 52 of the relay lever 5, whereby the throttle valve is opened and closed. Interference of the throttle valve shaft 2 with the relay lever 5 is thus prevented, and the relay lever 5 and the throttle valve opening/closing lever 3 are made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake throttle valve opening/closing device used for output control of an internal combustion engine.

[Conventional technology]

The normal structure of an intake throttle valve opening/closing device for an internal combustion engine is that the amount of accelerator pedal depression by the vehicle driver is directly transmitted to the shaft of the throttle valve via a link mechanism or cable installed in the vehicle, and the throttle valve opens. It was configured to adjust the angle. When such a throttle valve is used, the relationship between the amount of depression of the accelerator and the opening degree of the throttle valve is uniquely determined, and it may not be possible to respond to various requests from the driver when the vehicle is accelerating.

Therefore, the applicant provided a relay lever between the throttle valve opening/closing lever and the mechanism connected to the accelerator to form a link.
He proposed a device that could arbitrarily set the relationship between the movement of the accelerator and the opening of the throttle valve (for example, in Japanese Patent Publication No. 61-5
(Disclosed in Publication No. 3537).

[Problem to be solved by the invention]

In this device, the rotation center of the relay lever connected to the link or cable that transmits the movement of the accelerator and the rotation center of the throttle valve opening/closing lever connected to the relay lever via a cam are arranged eccentrically from each other. However, in the conventional device described above, both levers are made of plate-like members, so the levers are enlarged to avoid interference due to eccentric movement, and their swing range is also large. , it was necessary to provide sufficient clearance with surrounding equipment. This has made it difficult to increase the mounting capacity of the internal combustion engine and to reduce the overall height of the bonnet.

SUMMARY OF THE INVENTION The present invention provides an intake throttle valve opening/closing device in which the lever constituting the link is made smaller and the swing radius of the link is reduced to eliminate interference with surrounding devices and increase clearance. It is.

[Means to solve the problem]

In order to solve the above problems, the intake throttle valve opening/closing device of the present invention has a relay shaft that is fixed to the throttle valve body formed into a cylindrical shape with a bottom. In addition to rotatably supporting the lever, a throttle valve shaft with a throttle valve opening/closing lever attached is disposed inside the cylindrical portion of the relay shaft, and the two levers are connected by a roller and a cam groove to form a link.

[Effect]

With the above configuration, the relay lever and the throttle valve lever are made smaller, and when the throttle valve lever and the relay lever swing, they do not interfere with each other's rotation center axis, so the entire link is made smaller. The range of movement required for the rocking motion is also small.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

Fig. 1 is a front view of the intake throttle valve opening/closing device of the present invention, and Fig. 2 is a right side view, in which the throttle valve main body 1 has a throttle valve shaft 2 rotatably supported by two bearings (not shown). Be prepared.

A throttle valve 23 is fixed to the throttle valve shaft 2 by a bolt 24, and the throttle valve 23 is configured to open and close as the throttle valve shaft 2 rotates. A throttle valve opening/closing lever 3 is press-fitted into one end of a throttle valve shaft 2 protruding outside of the throttle valve main body 1 and fixed with a nut 26. The throttle valve opening/closing lever 3 is plate-shaped, and a cam groove 32 is formed at one end thereof.

On the other hand, a bottomed hole is formed in the boss portion 12 provided in the throttle valve main body 1, and a bottomed cylindrical relay shaft 4 is press-fitted into this bottomed hole and fixed with a screw 41. The center O of this relay shaft 4 is arranged eccentrically with respect to the center 02 of the throttle valve shaft 2. That is, the throttle valve shaft 2 is disposed so as to pass through the inside of the cylindrical portion of the relay shaft 4, which has a cylindrical shape with a bottom.

A relay lever 5 is attached to the outer periphery of the cylindrical portion of the relay shaft 4, which has a cylindrical shape with a bottom.
Supports rotatably. This relay lever 5 is an arm 52
A roller shaft 54 having a roller 53 attached thereto is installed at the tip of the arm 52.

Further, the relay lever 5 is formed with bent parts 55, 56, etc., and a spring 46 is formed between the relay lever 5 and the relay shaft 4.
is wound, one end 46a of the spring 46 is locked to the bent portion 55 of the relay lever, and the other end 46b of the spring 46 is fixed onto the throttle valve body by the screw 18.

A flange portion 42 is formed at the tip of the relay shaft 4 and locks the relay lever 5 by holding a resin washer 43 therebetween. A resin bushing 47 is also inserted between the spring 46 and the boss portion 12 of the throttle valve body to ensure smooth rotation of the relay lever 5.

The relay lever 5 is connected to a cable or link of an accelerator (not shown) via a mounting portion 57, and the relay lever 5 is always urged by a spring 46 in the direction of returning the accelerator. The bent portion 56 of the relay lever 5 is connected to the arm portion 1 of the throttle valve body 1.
The position of the return side is regulated by contacting the screw 4 screwed into 3. Similarly, the bent portion 55 is connected to the throttle valve body 1.
The maximum opening degree of the accelerator is regulated by coming into contact with a stopper 16 provided at.

The roller 53 attached to the arm 52 of the relay lever 5 is
It engages with the cam groove 32 of the throttle valve opening/closing lever 3 to form a link. A spring 27 is attached to the other end of the throttle valve shaft 2 to which the throttle valve opening/closing lever 3 is fixed, and always urges the throttle valve shaft 2 in a direction to close the throttle valve 23. An end 34 of the throttle valve opening/closing lever 3 on the side opposite to the cam groove 32 contacts a screw 15 screwed into the upper arm 3 of the throttle valve main body 1, thereby regulating the fully open position of the throttle valve 23.

Since the intake throttle valve opening/closing device of the present invention is constructed as described above, the relay lever 5 rotates in the direction shown by arrow A in FIG. 1 against the spring 46 in accordance with the amount of depression of the accelerator pedal. . In response to this rotation, the roller 53 attached to the arm portion 52 of the relay lever 5 also rotates in the direction of arrow A, thereby opening the throttle valve opening/closing lever 3 and the throttle valve shaft 2 integrated therewith via the cam groove 32 in contact with the roller 53. It rotates against the spring 27.

The throttle valve 23 opens and closes in accordance with the rotation of the throttle valve shaft 2.

By changing the shape of this cam groove 32, the relationship between the rotation angle of the relay lever 5 and the rotation angle of the throttle valve shaft 2 can be changed as appropriate. Thereby, the functional relationship between the amount of depression of the accelerator pedal and the opening degree of the intake throttle valve 23 can also be arbitrarily controlled.

〔Effect of the invention〕

As described above, in the present invention, the relay shaft, which is arranged eccentrically with respect to the throttle valve shaft to which the intake throttle valve is attached, has a cylindrical shape with a bottom, and the throttle valve shaft is arranged to penetrate through this cylindrical portion. be.

The outer periphery of the cylindrical part of the relay shaft rotatably supports the relay lever, and the roller attached to the relay lever engages with the cam groove of the throttle valve opening/closing lever attached to the throttle valve shaft. Adopts a structure in which the valve opening/closing levers are linked.

With this configuration, there is no risk of interference between the relay lever and the throttle valve shaft during rotation, so the relay lever and throttle valve opening/closing lever can be configured compactly, and the range of movement required for rotation can be reduced. I can do it.

This reduces the size of the intake throttle valve opening/closing device and saves space in the engine compartment.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a right side view. 1... Throttle valve body 12... Boss portion 14.15... Screw 16... Stopper 2... Throttle valve shaft 23... Throttle valve 27... Spring 3 ... Relay lever 32 ... Cam groove 4 ... Relay shaft 42 ... Flange 43 ... Synthetic resin washer 46 ... Spring 47 ... Synthetic resin bushing 5... Throttle valve opening/closing lever 53... Roller 54... Roller shaft 55.56... Bent part

Claims (1)

[Claims] 1. A link mechanism is constructed by connecting a throttle valve opening/closing lever and a relay lever connected to an accelerator via a cam groove provided on one lever and a roller provided on the other lever. In an intake throttle valve opening/closing device for output control of an internal combustion engine, the functional relationship between the amount of depression of the accelerator pedal of a vehicle and the opening amount of the intake throttle valve can be arbitrarily changed by changing the shape of the cam groove. It is equipped with a bottomed cylindrical relay shaft that is fixed to the valve body, and a relay lever that is rotatably supported by the outer circumference of the cylindrical portion of the relay shaft. An intake throttle valve opening/closing device for an internal combustion engine, characterized in that the intake throttle valve opening/closing device is disposed inside the internal combustion engine.