JPH07293282A - Opening/closing device for throttle valve for internal combustion engine - Google Patents

Abstract

PURPOSE:To improve the productivity and service performance by forming an accelerator lever which is formed integrally from several kinds of cam shapes. CONSTITUTION:An acceleration wire 2 is partially wound up on an accelerator lever which is formed integrally by joining the first, second, and the third cam shapes 51-53 having each different profile of a cam groove 55, by fixing the end part with a fixing pin 54. A fixing screw 21 and the fixing pin 54 are taken out, and the profile of the cam groove 55 is changed to an another shape by the recombination through the turn of an accelerator lever 5, and the coping with three kinds of output characteristics of the internal combustion engine is enabled by one accelerator lever 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve opening / closing device for an internal combustion engine for adjusting the intake air amount of the internal combustion engine.

[0002]

2. Description of the Related Art Normally, the output of an internal combustion engine is controlled by a throttle valve that adjusts the intake air amount. The opening of the throttle valve is adjusted by a combination mechanism such as an accelerator lever and an accelerator wire of a throttle valve opening / closing device for an internal combustion engine.

An example of such a throttle valve opening / closing device for an internal combustion engine is disclosed in Japanese Patent Application Laid-Open No. 62-19163.

According to this, there is shown a throttle valve opening characteristic in which the relationship of the change of the throttle valve opening with respect to the stroke amount of the accelerator wire is a curve. The characteristic of this curve is obtained as a predetermined change of the throttle valve opening with respect to the stroke amount of the accelerator wire from the predetermined cam shape of the accelerator lever, and finally, the predetermined output characteristic of the internal combustion engine. Is tied to.

In accordance with the required output characteristics, generally, the switchgear is provided with a fan-shaped accelerator lever having one cam shape for one internal combustion engine.

[0006]

As described above, in the prior art, a fan-shaped accelerator lever having one cam shape corresponds to one output characteristic. Therefore, for example, in order to obtain three types of output characteristics, three types of fan-shaped accelerator levers having cam shapes corresponding to the respective characteristics are required.

That is, three parts are manufactured. This leads to many types of parts to be manufactured, which is disadvantageous in terms of productivity and part management, resulting in high cost and deterioration of serviceability.

Therefore, an object of the present invention is to provide a throttle valve opening / closing device for an internal combustion engine, which can cope with several kinds of output characteristics, by forming one accelerator lever in which several kinds of cam shapes are integrally formed and recombining them. To do.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a throttle valve opening / closing device for an internal combustion engine in which the opening characteristic of the throttle valve is set by the profile of the cam groove portion of the accelerator lever. At least 2 with a profile corresponding to the degree characteristic
This is achieved by connecting different types of cam groove portions and integrally molding them.

Further, in an opening / closing device for a throttle valve for an internal combustion engine, which includes an accelerator lever having a cam groove and setting an opening characteristic of the throttle valve by a profile of the cam groove, and a shaft fitted with the accelerator lever, The accelerator lever has an even number of cam grooves that have profiles corresponding to different opening characteristics and are integrally formed, and an even or even number of cam grooves for fitting the accelerator lever and shaft. Or a boss portion having positioning, or the accelerator lever has a cam groove portion integrally formed by connecting one or more odd number of cam grooves having profiles corresponding to different opening characteristics, 1 for fitting the accelerator lever and shaft
It is also achieved by being configured with a boss portion having a double positioning of the above odd number or one or more odd number.

[0011]

The operation of the accelerator lever is made of a substantially disk-shaped body in which cam-shaped portions of several types of fan-shaped accelerator levers are connected and integrally formed.

That is, if the two types are integrally molded, the cam shape is an elliptic plate-shaped accelerator lever which is exactly divided into two 180 ° back to back. Further, if there are three types, it is a disk-shaped accelerator lever having a deformed rice ball shape divided into three at 120 °.

By removing the accelerator lever integrally formed as described above from the axis of the accelerator shaft and rotating the fitting with the accelerator shaft by 180 ° or 120 ° to change the combination, the output characteristic of several kinds of internal combustion engine can be obtained. It can be handled with one accelerator lever.

The ease and certainty of the reassembling work can be achieved by providing, for example, a hexagonal fitting positioning on the boss portion of the accelerator lever and the shaft portion of the accelerator shaft.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an opening / closing device for a throttle valve for an internal combustion engine according to an embodiment of the present invention.

The structure and operation are as follows. Depending on the amount of depression of the accelerator pedal 1 by the driver, the accelerator wire 2 is wound or unwound in the cam groove of the accelerator lever 5 by the force of the tension spring 3 and the rotation spring 4.

Accordingly, the throttle shaft 7 and the throttle valve 9 are rotated via the intermediate mechanism portion 6 connected to the accelerator lever 5. The intermediate mechanism section 6, which is depicted in a simplified manner because it has no direct relation to the present invention, is composed of a link, a lever, a shaft, etc., and transmits the rotation of the accelerator lever 5 to the throttle shaft 7.

With such a configuration and operation, the rotation angle of the throttle valve 9, that is, the throttle valve opening degree is changed according to the depression amount of the accelerator pedal 1, and the intake air amount flowing through the intake air passage 8 is adjusted. The output of the internal combustion engine is controlled.

FIG. 2 is a partially enlarged view of the throttle lever of one embodiment according to the present invention. FIG. 2A is a view showing a plane, and FIG. 2B is a view showing a side surface. The structure and operation are as follows.

The accelerator lever 5 has a first cam shape 51 and a second cam 52 in which the cam grooves 55 have different profiles.
And a third cam shape 53 are joined together to form a deformed rice ball shape disk.

With the rotation of the accelerator lever 5, the accelerator wire 2 whose end is fixed by the fixing pin 54 is partially wound around or rewound on the accelerator lever 5. In this embodiment, the case where it is wound up or rewound about 1/3 is shown.

The accelerator lever 5 is fitted on the accelerator shaft 22 and fastened with a fixing screw 21. And the accelerator lever 5 is the accelerator shaft 2
Rotate with 2 to wind up accelerator wire 2,
Rewind.

The accelerator shaft 22 has an intermediate mechanism portion 6
Are connected. A throttle shaft 7 is connected to the intermediate mechanism section 6. Finally, the rotation of the accelerator lever 5 is linked to the rotation of the throttle valve 9 (not shown), that is, the change of the throttle valve opening.

Here, the type of the cam groove 55 and the output characteristic will be briefly described. If the cam groove 55 has a semicircular or ⅓ circular profile, the radii are the same. Therefore, the accelerator wire 2 is wound around the cam groove 55 of the accelerator lever 5 as the accelerator lever 5 rotates. The stroke is proportional to the rotation angle of the accelerator lever 5. Due to such a relationship between the wire stroke and the rotation angle that is in direct proportion, the required output characteristics may not be obtained.

Therefore, for example, the cam groove 55 having a profile in which the central portion bulges like the first cam shape 51 is used.
By doing so, the wire stroke of the accelerator wire 2 is small in a region where the rotation angle of the accelerator lever 5 is small, becomes maximum at a medium rotation angle, and is large in a region where the rotation angle is large.
In addition, it may return to the original size and become smaller, so that the output characteristics required may be met.

As described above, the difference in the profile of the cam groove 55 is linked to the difference in the change in the wire stroke of the accelerator wire 2, that is, the change in the throttle valve opening and the intake air amount of the internal combustion engine. Various types of output characteristics are obtained by connecting to the amount of change.

The accelerator lever 5 of this embodiment is an integrally-molded lever having first, second and third cam shapes.
It is designed to support different types of output characteristics.

That is, in FIG. 2, if the fixing screw 21 and the fixing pin 54 are removed, and the accelerator lever 5 is appropriately rotated and reassembled, the profile of the cam groove 55 can be easily changed to another shape. It is possible to obtain output characteristics of the following types.

FIG. 3 is a view showing an embodiment of an accelerator lever divided into 120 °. FIG. 4 is a diagram showing an embodiment of an accelerator shaft fitted with the accelerator lever shown in FIG. In these examples, it is shown that they can be recombined by rotating them by 120 °.

The first cam shape 51, the second cam shape 52, and the third cam shape 53 are different in profile of the cam groove 55.
Are divided by 120 °, and one accelerator lever 5 having three cam shapes is formed. Then, in order to improve the dimensional accuracy of the wire stroke and the assemblability, a hexagonal fitting portion 31 as shown in the drawing is provided as positioning.

As described above, the boss portion of the accelerator lever 5 has a hexagonal fitting hole for recombination, and the accelerator shaft 22
There is a hexagonal fitting shaft part in the, which makes it easy to fit each other.

In order to distinguish the profiles,
Engraved characters 32 such as A and B are provided on the side surface of the accelerator lever 5 to facilitate the rearrangement. It is desirable that the accelerator lever 5 having such a shape is integrally formed of resin from the viewpoint of productivity.

FIG. 5 is a diagram showing an embodiment of an accelerator lever divided into 180 °. This embodiment is an example of one accelerator lever 5 having two cam shapes, and it is shown that the accelerator lever 5 can be reassembled by rotating it by 180 °.

Further, the fitting of the accelerator lever 5 and the accelerator shaft 22 is carried out by the square fitting portion 33. Although not shown, it is also possible to manufacture four cam-shaped accelerator levers divided by 90 °, and in this case, the square fitting portion 33 is also used.

FIG. 6 is a view showing another embodiment of the refitting fitting hole of the accelerator lever boss portion. FIG. 6A shows
The accelerator lever boss portion 60 has a fitting hole for changing the oval fitting portion 61. Figure 6
(B) has a refitting fitting hole for the star-shaped fitting part 62 in which three oval shapes are combined. The cross section of the fitting shaft portion of the accelerator shaft 22 that fits into these replacement fitting holes is oval.

FIG. 6C shows a fitting part 63 with two grooves having two key grooves. FIG. 6D shows a fitting portion 64 with three grooves having three key grooves. There is a key groove on the accelerator shaft 22 that fits into these rearrangement fitting holes.

The following can be said from FIGS. 3, 5, and 6.

When connecting an even number of cam shapes having different cam groove profiles, the number of positioning of the fitting hole of the accelerator shaft is the even number or a double number of the even number. For example, with two cam shapes, two, four, eight
Positioning such as one is provided. With four cam shapes, there are four, eight, etc.

When connecting an odd number of cam shapes, the fitting holes are positioned by the odd number or two of the odd number.
Double the number. For example, 3 cam shapes
One, six, twelve, etc. positionings are provided. However, odd number 1 is excluded.

The positioning shape is a polygonal surface, an oval shape, or a keyway.

With these fitting shapes, 60 °, 90 °
It can be used for ゜, 120 ゜, 180 ゜, etc., and it is possible to secure the dimensional accuracy of the wire stroke and easily change the accelerator lever.

[0042]

According to the present invention, since the parts of the accelerator lever can be unified, the production amount is increased, which is suitable for mass production. In addition, the number of types of parts inventory is reduced and production management is improved.

Furthermore, it also leads to improvement of after-service. That is, it becomes easy to supply and obtain the parts, and the inventory management is also improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an opening / closing device for a throttle valve for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of a throttle lever according to an embodiment of the present invention.

FIG. 3 is a view showing an example of an accelerator lever divided into 120 °.

FIG. 4 is a view showing an embodiment of an accelerator shaft fitted with the accelerator lever shown in FIG.

FIG. 5 is a view showing an example of an accelerator lever divided into 180 °.

FIG. 6 is a view showing another embodiment of the fitting hole for recombining the accelerator lever boss portion.

[Explanation of symbols]

1. Accelerator pedal 2. Accelerator wire 3. Extension spring 4. Rotating spring 5. Accelerator lever
6. Intermediate mechanism section 7. Throttle shaft 8. Intake air passage 9. Throttle valve 21. Fixing screw 2
2. Accelerator shaft 51. First cam shape 52. Second cam shape 53. Third cam shape 54. Fixed pin 5
5. Cam groove 31. Hexagonal fitting part 32. Stamped character 3
3. Square fitting part

Claims (8)

[Claims] 1. A throttle valve opening / closing apparatus for an internal combustion engine, wherein an opening characteristic of a throttle valve is set by a profile of a cam groove portion of an accelerator lever, wherein the accelerator lever has the profiles corresponding to different opening characteristics. An opening / closing device for a throttle valve for an internal combustion engine, characterized in that at least two types of the cam groove portions are joined together and integrally formed. 2. The opening / closing apparatus for a throttle valve for an internal combustion engine according to claim 1, wherein the accelerator lever has a rearrangement fitting hole for positioning the accelerator lever. 3. The opening / closing device for an internal combustion engine throttle valve according to claim 1, wherein the accelerator lever has a stamp character for distinguishing the type of the profile. 4. The opening / closing device for an internal combustion engine throttle valve according to claim 2, wherein the refitting fitting hole is a polygonal hole. 5. A throttle valve opening / closing device for an internal combustion engine according to claim 2, wherein the refitting fitting hole is an oval hole. 6. The opening / closing device for an internal combustion engine throttle valve according to claim 2, wherein the rearrangement fitting hole is a hole having a key groove. 7. A throttle valve opening / closing apparatus for an internal combustion engine, comprising: an accelerator lever having a cam groove and setting an opening characteristic of a throttle valve by a profile of the cam groove; and a shaft fitted to the accelerator lever. The accelerator lever has an even number of cam grooves that are integrally formed by connecting the even number of cam grooves having the profiles corresponding to different opening characteristics, and the even number for fitting the accelerator lever and the shaft. An opening / closing device for a throttle valve for an internal combustion engine, comprising: an even number of boss portions having double the positioning. 8. An opening / closing device for a throttle valve for an internal combustion engine, comprising: an accelerator lever having a cam groove for setting an opening characteristic of a throttle valve by a profile of the cam groove; and a shaft fitted with the accelerator lever. The accelerator lever has a cam groove portion in which one or more odd-numbered cam grooves having the profiles corresponding to different opening characteristics are connected and integrally formed, and a portion for fitting the accelerator lever and the shaft. An opening / closing device for a throttle valve for an internal combustion engine, comprising: a boss portion having a double positioning of the one or more odd number or the one or more odd number.