JPH0633802A - Throttle valve open/close device - Google Patents

Abstract

PURPOSE:To miniaturize a throttle valve open/close device having a non-linear characteristic. CONSTITUTION:A leaf spring 3 is locked perpendicularly to an axial direction of a shaft 2, between an accelerator lever 5 arranged at the shaft 2 turnably and an open/close lever 1 fixed on the shaft 2. The turning amount of an open/ close Lever 1 becomes smaller than that of the accelerator lever 5 because the leaf spring 3 is bent when an accelerator is pressed down. Furthermore, when the accelerator is pressed down more the bent condition of the leaf spring 3 becomes the largest, and thereby the accelerator lever 5 and the open/close lever 1 are turned together. Therefore, the characteristic is obtained that variation in the opening of a throttle valve 9 to that of the accelerator varies non- linearly corresponding to the control of the accelerator. Furthermore, the axial size is reduced with the laminated spring 3 adopted, resulting of in downsizing device itself.

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 adjusting the intake air amount of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, as this type of throttle valve opening / closing device, for example, an "intake throttle valve opening / closing device for an engine" disclosed in Japanese Utility Model Laid-Open No. 3-23622 is known.

In this throttle valve opening / closing device, an accelerator lever that is rotatably supported by a shaft that rotates the throttle valve and that rotates according to an accelerator operation amount, and a throttle valve that is fixed to the shaft and that rotates. A spring whose both ends are supported by the opening / closing lever and a return spring for urging the opening / closing lever in the throttle valve closing direction are provided.

Due to the balance of the elastic forces of the two springs, the rotation amount of the opening / closing lever becomes smaller than the rotation amount of the accelerator lever in the region where the accelerator operation amount is small.
When the accelerator lever rotates by a predetermined angle or more, both levers rotate by the same angle. Therefore, the change amount of the throttle valve opening with respect to the change amount of the accelerator operation amount is
The amount of rotation of the accelerator lever is smaller when it is up to a predetermined angle than when it is at a predetermined angle or more. Therefore, this throttle valve opening / closing device has a characteristic that the opening of the throttle valve changes non-linearly with respect to the change of the accelerator operation amount. Due to this non-linear characteristic, the change in the intake air amount is small in the region where the accelerator operation amount is small, so that the driver can easily control the output of the engine.

[0005]

However, in the above-mentioned throttle valve opening / closing device, the spring engaged with the accelerator lever and the opening / closing lever is provided on the shaft between the two levers, so that there is a gap between the two levers. Will be longer. Therefore, the shaft becomes long,
There is a problem in that the size of the device is increased.

In view of the above problems, it is an object of the present invention to reduce the size of a throttle valve opening / closing device having a non-linear characteristic.

[0007]

In order to achieve the above object, the present invention provides an opening / closing lever which is rotatably supported and opens / closes a throttle valve in accordance with the turning angle, and coaxially with the opening / closing lever. An accelerator lever that is provided in close proximity so as to interfere with the rotation of the opening / closing lever and that rotates according to the amount of operation of the accelerator; and a spring that biases the opening / closing lever in a predetermined rotation direction, Between the accelerator lever and the opening / closing lever, the two levers are vertically locked with respect to the rotation axis thereof, and are deformed by the balance with the elastic force of the spring to rotate the accelerator lever and the opening / closing lever. A throttle valve opening / closing device, comprising: a plate-shaped spring that changes a distance in a moving direction to increase / decrease a rotation amount of the accelerator lever and the opening / closing lever,
Adopt the technical means of.

[0008]

According to the above-described structure of the throttle valve opening / closing device of the present invention, the accelerator operation is performed coaxially with the rotatably provided opening / closing lever so as to interfere with the rotation of the opening / closing lever. An accelerator lever that rotates according to the amount is provided. Further, a plate-shaped spring installed perpendicularly to the rotation axis of both levers is provided between the opening / closing lever and the accelerator lever.

The plate-like spring is deformed by a balance with the elastic force of the spring for urging the opening / closing lever in a predetermined rotation direction, and changes the gap in the rotation direction between the accelerator lever and the opening / closing lever. . Therefore, the amount of rotation of the opening / closing lever with respect to the accelerator lever can be increased or decreased.
Therefore, it is possible to obtain a non-linear characteristic that the characteristic of the change amount of the throttle valve opening with respect to the change amount of the accelerator operation amount changes according to the accelerator operation amount. Further, since a plate-shaped spring that is locked between two levers provided coaxially is installed perpendicularly to the rotation axis of the lever, both levers can interfere with each other's rotation. It is possible to bring them close to each other. Therefore, the axial distance between both levers is shortened.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the throttle valve opening / closing device of the present invention will be described. FIG. 1 is a partial cross-sectional view of the throttle valve opening / closing device of this embodiment, and FIG. 2 is a view on arrow A of FIG.

An intake passage is formed inside the throttle body 11, and a throttle valve 9 is provided in the intake passage. The throttle valve 9 is fixed to a shaft 2 that is rotatably attached to a throttle body 11. The throttle valve 9 is also rotated by the rotation of the shaft 2, and the amount of intake air passing through the intake passage is adjusted. Here, the arrow direction in FIG. 2 is the opening direction of the throttle valve 9.

One end of the shaft 2 has a throttle body 11
Stick out from. An accelerator lever 5 is rotatably attached to the shaft 2 by a nut 12 at the tip of the protruding shaft 2.

The accelerator lever 5 is a fan-shaped member, and is connected to an accelerator (not shown) via a wire 6. Then, depending on the operation amount of the accelerator, the wire 6
Is pulled, and the accelerator lever 5 rotates. Further, an end portion of the accelerator lever 5 on the opening direction side of the throttle valve 9 is bent vertically toward the throttle body 11 side to form a plate-shaped engaging portion 5a. Further, on the arcuate outer periphery of the accelerator lever 5, there is formed an extension portion 5c extending a predetermined amount toward the opening direction side of the throttle valve 9. And this extension 5
The tip of c is bent vertically in the direction of the shaft 2 to form a protrusion 5b.

An opening / closing lever 1 for opening / closing the throttle valve 9 is fixed to the shaft 2. When the accelerator lever 5 rotates, the opening / closing lever 1 is so close as to interfere with the rotation. Also, the opening / closing lever 1
Is provided on the throttle lever 9 opening direction side of the accelerator lever 5, and is formed so that the tip of the opening / closing lever 1 can abut the protrusion 5b. Further, one end of a leaf spring 3 is attached to the opening / closing lever 1 on the throttle valve 2 closing direction side with a rivet 4. On the other hand, the other end of the leaf spring 3 contacts the locking portion 5 a of the accelerator lever 5. Therefore, the tip end of the opening / closing lever 1 is constantly pressed against the projection 5b of the accelerator lever 5 by the urging force of the leaf spring 3.

Further, a return spring 10 is attached between the opening / closing lever 1 of the shaft 2 and the body 11. One end of the return spring 10 is locked to the body 11, and the other end is locked to the opening direction side of the opening / closing lever 1. The return spring 10 urges the opening / closing lever 1 in the closing direction of the throttle valve 9. Further, when the accelerator pedal is not depressed, the opening / closing lever 1 is rotated by the return spring 10 in the closing direction of the throttle valve 9. At this time, the throttle body 11 is provided with a stopper (not shown) so that the opening / closing lever 1 stops at the position where the throttle valve 9 is fully closed. The elastic coefficient of the return spring 10 is set to be higher than that of the leaf spring 3. However, when the accelerator lever 5 is pulled by the wire 6, both the leaf spring 3 and the return spring 10 are displaced. .

The operation of the throttle valve opening / closing device having the above structure will be described. When an accelerator (not shown) is depressed,
The wire 6 is pulled according to the operation amount, and the accelerator lever 5
Rotates. At this time, since the elastic coefficient of the leaf spring 3 is equal to or less than the elastic coefficient of the return spring 10, the leaf spring 3 bends when the accelerator lever 5 rotates. Further, the opening / closing lever 1 is also rotated via the plate spring 3, and the throttle valve 2 is rotated to an opening in which the elastic force of the plate spring 3 and the elastic force of the return spring 10 are balanced. When the accelerator is further stepped on and the amount of deflection of the leaf spring 3 is maximized, the accelerator lever 5 and the opening / closing lever 1 rotate integrally.

That is, when the accelerator operation amount is small, the leaf spring 3 bends when the accelerator lever 5 rotates. Therefore, the distance between the accelerator lever 5 and the opening / closing lever 1 in the rotating direction is the same as when the throttle valve 9 is fully closed. It is smaller than the distance between both levers. Therefore, the amount of rotation of the opening / closing lever 1 decreases with respect to the amount of rotation of the accelerator lever 5. And
When the deflection of the leaf spring 3 is maximized, the accelerator lever 5 and the opening / closing lever 1 rotate together. Therefore, regarding the opening change amount of the throttle valve 9 with respect to the change amount of the accelerator operation amount until the deflection of the leaf spring 3 becomes maximum, the deflection of the leaf spring 3 becomes maximum and the opening / closing lever 1 and the accelerator lever 5 rotate integrally. It becomes smaller than when moving.

Therefore, as shown in FIG. 3, it is possible to obtain a non-linear characteristic that the amount of change in the throttle valve opening with respect to the amount of change in the accelerator operation amount changes according to the amount of accelerator operation.

Further, FIG. 3 shows the torque characteristic with respect to the valve opening of a normal engine. If the throttle valve opening / closing device having the above-mentioned non-linear characteristic is applied to the engine having this torque characteristic, the change amount of the opening degree of the throttle valve 9 becomes smaller with respect to the change amount of the accelerator operation amount in the region where the accelerator operation amount is small. , The torque rises smoothly as shown in FIG. Therefore, the torque suddenly rises just by depressing the accelerator a little,
For example, it is possible to solve a problem that causes wheel spin. Therefore, the driver can easily control the output of the engine.

As described above, by installing the leaf spring 3 perpendicularly to the rotation axes of the levers 1 and 5 and between the levers 1 and 5, the opening / closing lever 1 and the accelerator lever 5 are
The closer they can interfere with each other's rotation, the closer they can be on the shaft 2. Therefore, the length of the shaft 2 can be shortened, and the device size in the axial direction of the shaft 2 can be significantly reduced. Therefore, the device can be downsized, and the mountability on the engine can be improved.

As shown in FIG. 5, a long leaf spring 3a
And the short leaf spring 3b may be attached. At this time,
When the accelerator lever 5 rotates, the long leaf spring 3a bends first, and when the accelerator lever 5 rotates, the short leaf spring 3b also bends, so that a non-linear characteristic as shown in FIG. 6 is obtained. As shown in this figure, the valve opening can be changed more smoothly with respect to the accelerator operation amount. Therefore, the change in the engine torque with respect to the accelerator operation amount is improved, so that the drivability can be improved.

Further, in the case of an engine having a torque characteristic with respect to the valve opening as shown in FIG. 7, and in the case of an automatic transmission, the increase in the engine torque may be slow even if the valve is opened, and the acceleration may be poor. Therefore, the nonlinear characteristic as shown in FIG. 7 may be required. As shown in FIG. 8, the radius R of the accelerator lever 5 is reduced and the leaf spring 7 is added so as to satisfy the requirement of such a non-linear characteristic. Reference numeral 8 denotes a stopper attached to the throttle body 11, which comes into contact with the leaf spring 7 when the accelerator operation amount reaches a predetermined amount. Further, the elastic coefficient of the leaf spring 3 is made sufficiently larger than that of the return spring 10 so that the leaf spring 3 does not bend even when the wire 6 is pulled, and the opening / closing lever 1 and the accelerator lever 5 are not bent.
Make sure that and rotate together. Further, regarding the relationship of the elastic coefficients of the leaf spring 7 and the leaf spring 3,
It is set so that both the leaf spring 7 and the leaf spring 3 can bend when they abut.

In the throttle valve opening / closing device having the above-mentioned structure, when the accelerator is depressed, the opening / closing lever 1 and the accelerator lever 5 rotate integrally, and further the accelerator lever 5
Since the radius R of the valve is small, the valve opening change amount increases with respect to the accelerator operation amount change amount. Next, when the leaf spring 7 comes into contact with the stopper 8, both the leaf spring 7 and the leaf spring 3 bend, so that the return spring 1
The throttle valve 9 is opened to an opening where the elastic forces of 0, the leaf spring 7, and the leaf spring 3 are balanced. Therefore, since the rotation amount of the opening / closing lever 1 decreases with respect to the rotation amount of the accelerator lever 5, the non-linear characteristic shown in FIG. 6 can be obtained.

Various non-linear characteristics can be obtained by changing the number of leaf springs as in the second embodiment or by changing the elastic coefficient of the leaf springs as in the third embodiment. Further, the leaf spring 3 may be fixed to the accelerator lever 5 instead of being fixed to the opening / closing lever 1.

Further, as shown in FIG. 9, an opening / closing lever 1 may be provided on the throttle lever 9 closing direction side of the accelerator lever 5. At this time, unlike the first embodiment, a locking portion 5a is formed at the throttle valve 9 closing direction side end of the accelerator lever 5, and an extending portion 5c is formed on the arcuate outer periphery toward the throttle valve 9 closing direction side. To do. Then, the opening / closing lever 1 comes into contact with the locking portion 5 a, and the rivet 4 is attached to the opening / closing lever 1.
The leaf spring 3 fixed by means of the projection 5b at the tip of the extending portion 5c.
Lock on. In addition, the leaf spring 3 and the return spring 10
The elastic coefficients of and are set to be larger for the return spring 10, but are set so that both can be displaced when the accelerator lever 5 rotates.

When the accelerator is depressed, the accelerator lever 5 is rotated, the leaf spring 3 is bent and the opening / closing lever 1 is also rotated through the leaf spring 3, so that the elastic force of the leaf spring 3 and the return spring 10 are balanced. Throttle valve 9 opens up to 4 degrees. Further, when the accelerator lever 5 is rotated and the amount of deflection of the leaf spring 3 is maximized, the accelerator lever 5 and the opening / closing lever 1 are integrally rotated thereafter.

Therefore, the non-linear characteristic as shown in FIG. 3 can be obtained. Moreover, since the size of the device can be reduced by fixing the leaf springs perpendicularly to the rotating shafts of both levers, even if an opening / closing lever is provided on the valve closing direction side of the accelerator lever, the same as in the above embodiment. The effect of can be obtained.

Further, another shaft is formed in the throttle body in parallel with the shaft supporting the throttle valve, and a lever for rotating the throttle valve, a lever for connecting with an accelerator and a leaf spring are provided on this shaft. Good. In this case, both levers are rotatably provided with respect to this shaft, and the lever that rotates the throttle valve and the shaft that supports the throttle valve are linked by a link, and the throttle valve is rotated by the lever rotation. It can be so.

In the above-described embodiments, a non-linear characteristic is obtained in which the change amount of the throttle valve opening with respect to the change amount of the accelerator operation amount changes according to the accelerator operation amount. The non-linear characteristic is not limited to the polygonal line characteristic as shown in the above embodiment, and the characteristic that the amount of change in the throttle valve opening with respect to the amount of change in the accelerator operation amount changes smoothly according to the amount of operation of the accelerator. May be For example, if the leaf spring of the above-mentioned embodiment is of a progressive rate whose elastic coefficient changes in accordance with the amount of flexure, it is possible to obtain a non-linear characteristic that smoothly changes in a curved shape.

As described above, in the above-described embodiments, the change characteristic of the accelerator operation amount and the throttle valve opening degree is a non-linear characteristic, so that the accelerator operation amount and the throttle valve opening degree are related to each other. As compared with the linear characteristic that changes proportionally over the entire operating range, the desired characteristic that meets the application of the engine or the needs of the driver can be obtained.

[0031]

According to the structure and operation of the throttle valve opening / closing device of the present invention described above, a non-linear characteristic is obtained, and the opening / closing lever and the accelerator lever can be brought close enough to interfere with each other's rotation. it can. Therefore, the distance between both levers can be shortened, and the throttle valve opening / closing device having a non-linear characteristic can be downsized.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment to which the present invention is applied.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a characteristic diagram showing a relationship between an accelerator opening, a valve opening, and an engine torque.

FIG. 4 is a characteristic diagram showing a relationship between an accelerator operation amount and an engine torque.

FIG. 5 is a side view showing another embodiment.

FIG. 6 is a characteristic diagram showing a non-linear characteristic of another embodiment.

FIG. 7 is a characteristic diagram showing a non-linear characteristic of another embodiment.

FIG. 8 is a side view showing another embodiment.

FIG. 9 is a side view showing another embodiment.

[Explanation of symbols]

 1 Open / close lever 2 Shaft 3 Leaf spring 5 Accelerator lever 9 Throttle valve

Claims (1)

[Claims] 1. An opening / closing lever that is rotatably supported and that opens and closes a throttle valve in accordance with a turning angle of the opening and closing lever. An accelerator lever that is provided to rotate according to the amount of operation of the accelerator, a spring that urges the opening / closing lever in a predetermined rotation direction, and the spring between the accelerator lever and the opening / closing lever
Locked vertically with respect to the rotation axis of the two levers, and deformed due to the balance with the elastic force of the spring to change the distance in the rotation direction between the accelerator lever and the opening / closing lever. A throttle valve opening / closing device, comprising: a plate-shaped spring for increasing / decreasing a rotation amount of an opening / closing lever.