JPS6145377Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lever device that interlocks an actuator that operates in response to a clutch pedal depression operation and a clutch release shaft that includes a release yoke.

For example, in medium-sized trucks, etc., by connecting a clutch slave cylinder to the main cylinder operated by the clutch petal, the clutch release shaft is rotated against the return spring by the driving force generated in the clutch slave cylinder. I'm trying to make it move. Therefore, the base of the lever is connected to the end of the shaft, and the tip of the lever is connected to the tip of the rod extending from the slave cylinder.

However, in medium-sized trucks such as those mentioned above, a clutch booster may be optionally used in place of the clutch slave cylinder at the user's request in order to reduce clutch operation force and reduce driver fatigue. When installing a clutch booster in place of the slave cylinder in this way, the tip of the rod extending from the booster is connected to the tip of the lever, but the stroke ratio between the main cylinder and the clutch slave cylinder , the stroke ratios of the main cylinder and clutch booster are not necessarily the same.

Also, since the clutch booster has a larger shape (diameter) than the clutch slave cylinder,
Rod's position changes. Therefore, in combination with the above-mentioned change in stroke ratio, it has been impossible to directly use the lever for the clutch slave cylinder as the lever for the clutch booster.

In order to deal with these problems, conventionally, levers with lever ratios corresponding to the stroke amount of actuators such as clutch slave cylinders or clutch boosters have been prepared, and A lever was attached to the end of the clutch release shaft. however,
When installing this lever, due to the relationship between the workability of attaching and detaching the lever and the strength of the connection between the lever and the shaft, the two were connected via an interlocking mechanism such as a spline or serration, which reduced the processing cost of the clutch release shaft. It has the disadvantage of being high.

In addition, in order to eliminate such drawbacks, it may be possible to use a variable length lever (link) as described in, for example, Japanese Utility Model Publication No. 50-41417, but in this case, the lever ratio Since a pair of licks are always required regardless of the size of the lever, the weight of the lever device increases, and furthermore, simply changing the length of the lever cannot cope with changes in the rod position caused by changing the actuator. The problem was that I couldn't do it.

The present invention was developed in view of the above, and the base of the lever body, which is configured with a lever ratio that matches the stroke amount of the standard type actuator that is produced in the largest number of units, is fixed to the end of the clutch release shaft by welding. While reducing the manufacturing cost of mass-produced clutch devices, an auxiliary lever is attached to the lever main body to accommodate actuators such as clutch boosters that are installed as options, making it possible to adapt the lever ratio and shape of the lever. . Another object of the present invention is to provide a lever device for a clutch release shaft that has excellent workability and does not require replacing the return spring even when changing the lever ratio by causing the return spring to act on the lever body.

In order to achieve such an object, the present invention provides a lever device that interlocks a clutch release shaft with an actuator that operates in response to a depression operation of a clutch pedal, in which a base of a lever body is welded to an end of the clutch release shaft. fixed,
An auxiliary lever is detachably attached to the lever body. Further, coupling holes are formed in the tip portions of the lever main body and the auxiliary lever, respectively, for coupling the tips of rods extending from the actuator. The present invention is characterized in that by engaging a return spring with the lever body, the clutch release shaft is rotatably attached in the return direction of the actuator via the lever body.

Therefore, if the auxiliary lever is attached or detached as the actuator is changed, the lever ratio of the lever device and the connection position (shape) with the rod will change accordingly.
Furthermore, since the return spring is configured to act on the lever body, there is no need to replace (rehang) the return spring even if the auxiliary lever is attached or detached, improving the workability of replacing the actuator.

The present invention will be described below with reference to an illustrated embodiment.

A clutch release shaft 3 provided with a clutch release yoke 2 is pivotally supported in a clutch housing 1 which includes a clutch fitting (not shown).
The transmission case 4 is tightened and fixed to the rear end of the clutch housing 1, but the front end of the clutch housing 1 is connected to the rear end surface of the engine cylinder block (not shown) through a flywheel housing (not shown). It is tightened and fixed.

Further, a clutch booster 5 is attached to the outer surface of the transmission case 4 to which hydraulic pressure from a main cylinder (not shown), which is operated by a clutch pedal (not shown), is supplied as control hydraulic pressure. A lever device 8 is used as a means for converting the reciprocating linear motion of the rod 7, whose base end is abutted and locked to the hydraulic piston 6 of the hydraulic cylinder portion of the clutch booster 5, into rotational motion of the clutch release shaft 3. It is set up.

Here, the lever device 8 includes a lever body 9 whose base is fixed to the end of the clutch release shaft 3 by welding, and a bolt 1 on the outer surface of the lever body 9.
It consists of an auxiliary lever 11 which is tightened and fixed at 0a and 10b. Then, coupling holes 12 and 13 are formed at the tip of the lever body 9 and the tip of the auxiliary lever 11, respectively, and from the axis of the clutch release shaft 3 to the center of the coupling hole 13 of the auxiliary lever 11. By making the distance from the shaft center to the center of the coupling holes 12 and 13 of the lever body 9, the coupling hole 1
2 and 13 are selectively used to change the lever ratio of the lever device 8.

On the other hand, by drilling an engagement hole 14 independently of the coupling hole 12 at the tip of the lever main body 9 in which the coupling hole 12 that reduces the lever ratio is formed, the engagement hole 14 and the transformer Mission case 4
A return spring 16 is tensioned and locked between a bracket 15 that fixes the booster 5 to the clutch booster 5, thereby biasing the lever device 8 toward the clutch booster 5.

As shown in Figures 1 to 4,
When the clutch booster 5 with a large stroke is used as the actuator, the clevis 17 fixed to the tip of the rod 7 is pivotally connected to the coupling hole 13 of the auxiliary lever 11 with a pin 18 to increase the lever ratio of the lever device 8. . On the other hand, if a slave cylinder 19 with a small stroke amount is used as the actuator as shown in FIGS. 5 and 6,
The clevis 17 is pivotally attached to the coupling hole 12 of the lever body 9 by a pin 18, but in this case, the weight of the lever device 8 can be reduced by removing the auxiliary lever 11 which does not hold any special function. In addition, when the slave cylinder 19 is adopted as the actuator as shown in FIGS. 5 and 6, the bracket 15
Since the slave cylinder 19 can be mounted directly on the outer surface of the transmission case 4 without using a 20 and the engagement hole 1 of the lever body 9
4, a return spring 16 may be provided between the two.

That is, according to the present invention, the basic structure of the lever device 8 is formed by fixing the base of the lever body 9 to the shaft end of the clutch release shaft 3 by welding, and the auxiliary lever 11 is attached to and detached from the lever body 9 to form the lever. device 8
The lever ratio can be changed.
Therefore, the length of the auxiliary lever 11 (the position of the coupling hole) can be adjusted depending on the stroke amount of the clutch booster or slave cylinder, which is the actuator that responds to the depression operation of the clutch pedal. ), the lever ratio of the lever device 8 can be changed in accordance with the stroke characteristics of the actuator.

For this purpose, by welding and fixing the lever body 9 to the shaft end of the clutch release shaft 3, which has a lever ratio that matches the stroke characteristics of the actuator that is produced in the largest number of units, it is possible to use the lever body 9 for small-volume production actuators other than mass-produced models. On the other hand, by adding an auxiliary lever 11 to the lever main body 9, a lever device 8 having a desired lever ratio and shape can be obtained. As a result, there is no need to engage and connect the clutch release shaft and lever with splines or serrations as in the past, and the lever ratio of the lever device can be easily changed when changing the actuator model after the clutch device is assembled. can.

Further, no matter how the lever ratio of the lever device is changed, the tip of the return spring 16 is always locked to the lever body 9, so there is no need to replace the return spring 16 when replacing the actuator. For this reason, there is no need to prepare various types of return springs corresponding to actuators produced in small quantities, and parts management is facilitated.

In the embodiment, the base of the auxiliary lever 11 is extended to the clutch release shaft 3, and the end of the shaft 3 is positioned and fitted to the end of the shaft 3 to improve the assembly accuracy of the auxiliary lever 11. However, the auxiliary lever 11 may be attached to the tip of the lever body 9. Further, in the embodiment, bolt holes are formed in the lever main body 9 and the auxiliary lever 11, respectively, and the bolts 10a and 10 are connected to each other.
b, and one bolt 10a is screwed in from the inner surface of the lever body 9, and the other bolt 10b is screwed in from the outside surface of the auxiliary lever 11 to tighten and fix both levers. The positioning mechanism and coupling structure are not necessarily limited to the embodiments. 21 grease nipple.

As explained above, according to the present invention, although the lever body is fixed to the clutch release shaft by welding and the processing cost of the shaft etc. can be reduced,
The lever ratio of the lever device can be changed simply by attaching and detaching the auxiliary lever to the lever body, and the shape of the lever can also be changed in accordance with the rod position of the actuator. Additionally, when an actuator is replaced, if an auxiliary lever corresponding to the actuator is attached to the lever body, the lever can have a lever ratio and shape that matches the new actuator without any special adjustment or measurement work. Since the device can be obtained immediately, the actuator replacement work efficiency is improved. Moreover, since the return spring acts on the lever body, there is no need to replace the return spring even if the lever ratio is changed by attaching or detaching the auxiliary lever, and even if there are various types of actuators, the return spring The number of types can be reduced, and parts management can be simplified. Furthermore, since there is no need to provide an auxiliary lever in the case of the standard type lever device, which is the most produced, the weight and cost of the standard type lever device are reduced compared to the case where a variable length lever is used. be able to.

[Brief explanation of drawings]

The figure shows one embodiment of the lever device according to the present invention, and FIG. 1 is a front view of the lever device employing a clutch booster as the actuator;
Figure 2 is a plan view of Figure 1, Figure 8 is A- of Figure 1.
A sectional view, FIG. 4 is an enlarged sectional view of the main part, FIG. 5 is a front view of a lever device employing a slave cylinder as an actuator, and FIG. 6 is a plan view of FIG. 5. 3... Clutch release shaft, 5... Clutch booster, 7... Rod, 8... Lever device, 9... Lever body, 10a, 10b... Bolt, 11... Auxiliary lever, 12, 13... Connection hole , 14... Engagement hole, 16... Return spring, 17... Clevis, 18... Pin, 19...
slave cylinder.

Claims (1)

[Scope of utility model registration request] A lever device that interlocks a clutch release shaft with an actuator that operates in response to a depression operation of a clutch pedal, the base of a lever body being fixed to the end of the clutch release shaft by welding, and an auxiliary lever being attached to the lever device. The lever body is removably attached, and coupling holes for coupling the tips of rods extending from the actuator are formed in the distal ends of the lever main body and the auxiliary lever, respectively, and a return spring is coupled to the lever main body, so that the lever main body is fixed. A lever device for a clutch release shaft, characterized in that the clutch release shaft is rotationally biased in the return direction of the actuator.