JPH055296Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a clutch booster, and in particular, the invention relates to a clutch booster, in particular, between the hydraulic piston, which is in contact with the working fluid from the master cylinder, and the clutch lever.
This invention relates to a clutch booster with an interposed elastic member.

b. Prior Art A conventional general clutch booster 1 is shown in FIG. This clutch booster 1 is composed of an air cylinder section 2 and a hydraulic cylinder section 3, and the air cylinder section 2 has a power piston 4.
Further, a hydraulic piston 5 is disposed in each of the hydraulic cylinder sections 3. An oil chamber 6 is formed behind the hydraulic piston 5, and this oil chamber 6 is connected to a master cylinder 8 by a pipe 7. On the other hand, a pressure chamber 9 is formed behind the power piston 4, and this pressure chamber 9 is connected to an air tank 12 via a pipe line 10 and a relay valve 11. relay valve 1
1 is connected to an oil chamber 6 via a pipe 13, and the pressure in the oil chamber 6 is used as control fluid pressure to control the relay valve 11.
is configured to act on the When the clutch pedal 14 is depressed, oil from the master cylinder 8 is supplied to the oil chamber 6 of the clutch booster 1, and in response to the resulting increase in pressure in the oil chamber 6, compressed air in the air tank 12 is relayed. Valve 1
1 to the pressure chamber 9. And the forward force of the power piston 4 is the piston rod 15,
The clutch is disengaged by being transmitted to the clutch lever 17 via the hydraulic piston 5 and push rod 16.

c. Problems to be Solved by the Invention Although the conventional clutch booster 1 is generally constructed as described above, the following problems have been pointed out in this clutch booster 1. In other words, the clutch device is generally susceptible to engine vibrations,
Furthermore, the clutch device itself tends to generate vibrations due to the friction of the clutch plate each time it is engaged or disengaged, and this vibration is caused by the clutch lever 17 and push rod 1.
6 to the hydraulic piston 5, the vibration is transmitted to the master cylinder 8 via the conduit 7, which may deteriorate the durability of the sealing device of the master cylinder 8 or cause the clutch pedal 14 to vibrate. There is a risk that such problems may occur.

Therefore, a technique for solving such problems has been proposed in Japanese Patent Application Laid-Open No. 54-53740. As shown in FIG. 4, this technique is an example applied to a normal clutch operation cylinder 21, and a hydraulic vibration absorber 23 is installed in the middle of a pipe line 22 leading from the master cylinder 8 to the clutch operation cylinder 21. This is what was installed. This device 23 connects the clutch operating cylinder 21 to the master cylinder 8.
The vibration of the hydraulic pressure propagated to the piston 24 is absorbed by the elastic member 25 via the piston 24.

However, arranging such a device 23 in the middle of the conduit 22 poses problems in terms of cost and the need to secure new installation space.

The present invention was developed in view of the above circumstances, and its purpose is to provide a clutch booster that has an extremely simple configuration and can absorb vibrations from the clutch device without requiring additional installation space. be.

d Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a power piston and a hydraulic piston that can be moved into and out of contact with each other, and a power piston and a hydraulic piston that are formed behind the hydraulic piston and actuate the master cylinder. It has an oil chamber into which fluid is supplied and discharged, converts the increment of pressure in the oil chamber into driving pressure via a relay valve, and applies this driving pressure to the power piston to move it forward. In a clutch booster configured to drive a clutch lever by this forward force, the hydraulic piston is disposed behind the power piston, and an elastic member is interposed between the power piston and the hydraulic piston. It was established.

e Effect: According to the clutch booster configured as described above, the vibrations of the clutch device are absorbed by the elastic member, so it is possible to prevent hydraulic vibrations from occurring in the hydraulic system from the oil chamber to the master cylinder. It is possible to prevent deterioration of the durability of the cylinder sealing device and unpleasant vibrations of the clutch pedal.

f. Example An example of the present invention will be described below in detail with reference to FIG. FIG. 1 shows an embodiment in which the present invention is applied to the conventional clutch booster 1 shown in FIG. An elastic member 28 is arranged between the power piston 4 and the hydraulic piston 5. Specifically, a storage hole 32 is formed at the rear of the power piston 4, and the elastic member 28 is fitted into this storage hole 32. Note that a preload may be applied to the elastic member 28 by a presser member 30 and a stopper ring 31 as shown in FIG. 2, thereby preventing loss of stroke due to deformation of the elastic member 28. On the other hand, a rod portion 5a is integrally formed at the front portion of the hydraulic piston 5, and the tip of the rod portion 5a abuts on the presser member 30 so as to be able to come into contact with and separate from it. A hydraulic oil chamber 6 is formed behind the hydraulic piston 5, and this hydraulic oil chamber 6 is connected to a master cylinder 8 via a conduit 7. Note that 33 is a relay piston. Other parts corresponding to those in FIG. 3 are designated by the same reference numerals, and redundant explanation thereof will be omitted.

In the clutch booster described above, the vibration propagated from the clutch device to the push rod 16 is further propagated from the relay piston 33 to the power piston 4, but is then absorbed by the elastic member 28, so that the vibration is not transmitted to the hydraulic piston 5. It doesn't get across. Therefore, the above-described problem can be solved without vibration occurring in the hydraulic system extending from the fluid chamber 6 to the master cylinder 8. In addition, in this clutch booster, since the forward force of the power piston 4 does not act on the elastic member 28, the load resistance of the elastic member 28 can be relaxed and its size can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the gist thereof.

g. Effects of the invention In the present invention, as mentioned above, the hydraulic piston is disposed behind the power piston, and an elastic member is interposed between the power piston and the hydraulic piston, so that vibrations from the clutch device are prevented. This is absorbed by the elastic member and prevents hydraulic vibrations from occurring in the hydraulic system from the oil chamber behind the hydraulic piston to the master cylinder, resulting in deterioration of the durability of the sealing device of the master cylinder and damage to the clutch. Not only can unpleasant vibration noise of the pedal be prevented, but also the forward force of the power piston does not act on the elastic member, so the load bearing capacity of the elastic member is relaxed, and the size of the elastic member can be reduced and damage can be prevented. It has the effect of being able to Further, since the present invention has a simple structure using an elastic member, it can be realized at low cost, and does not particularly require a new space for arranging the elastic member.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a clutch booster according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a modification of the main part of FIG. 1. Further, FIG. 3 is a longitudinal sectional view of a conventional clutch booster, and FIG. 4 is a longitudinal sectional view of a conventional hydraulic vibration absorber. 4... Power piston, 5... Hydraulic piston, 6... Oil chamber, 8... Master cylinder, 11... Relay valve, 14... Clutch pedal, 16... Bush rod, 17... Clutch lever, 28 ...Elastic member.

Claims (1)

[Scope of utility model registration request] It has a power piston and a hydraulic piston that can be moved toward and away from each other, and an oil chamber that is formed behind and in contact with the hydraulic piston to supply and discharge the working fluid of the master cylinder. The clutch booster converts the increment into driving pressure via a relay valve, applies this driving pressure to the power piston to move it forward, and uses this forward force to drive the clutch lever. A clutch booster characterized in that a hydraulic piston is disposed behind the power piston, and an elastic member is interposed between the power piston and the hydraulic piston.