JPS631061Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clutch release cylinder for an automobile, and more particularly to a clutch release cylinder that suppresses transmission of engine vibrations during clutch operation.

In a hydraulic clutch operation mechanism, when the clutch is operated, engine vibrations are transmitted from the clutch to the clutch pedal and the dash panel via hydraulic pressure, causing problems such as abnormal vibrations of the clutch pedal and abnormal noises in the passenger compartment. Conventional countermeasures for this purpose include the following:

(1) A rubber damper is installed on the push rod of the clutch master cylinder, which is part of the engine vibration transmission path, and the transmitted vibration is absorbed by the rubber damper.

(2) A flexible hose is installed in a part of the hydraulic piping, and hydraulic pulsations are absorbed by the flexible hose's radial expansion and contraction.

(3) The second piston is supported by the cylinder body via rubber, and the pulsations of the hydraulic pressure are absorbed by the movement of the second piston (Utility Application No. 56-89553). However, in (1) the structure of the push rod becomes complicated and costs increase, in (2) the effect is insufficient and there are problems with durability, and in (3) the number of parts increases. It contained.

An object of the present invention is to provide a clutch release cylinder that can eliminate the above-mentioned drawbacks of conventional measures and prevent abnormal vibrations of the clutch pedal and abnormal noises in the passenger compartment during clutch operation.

To achieve this purpose, in the clutch release cylinder of the present invention, a part of the outer periphery of the piston that is slidably incorporated into the cylinder body is provided with a sealing protrusion that can come into direct sliding contact with the inner wall surface of the cylinder body. By arranging the piston along the axial direction and securing a predetermined clearance between the outer peripheral surface of the piston and the inner wall surface of the cylinder body along the axial direction,
The piston is configured to allow flexural deformation in the axial direction of the piston in order to suppress engine vibration when the clutch is operated.

Therefore, according to the above configuration, a predetermined clearance is secured between the outer peripheral surface of the piston and the inner wall surface of the cylinder body by the sealing projection. This clearance allows for reliable deformation of the piston in the axial direction. Therefore, when engine vibration is transmitted to the hydraulic medium, it can be skillfully absorbed by smoothly expanding and contracting the piston in the axial direction.

In other words, the sealing protrusion also functions as a gap retainer.

As a result, transmission of engine vibration from the clutch release cylinder to the clutch pedal and dash panel via the hydraulic medium is suppressed, and abnormal vibrations of the clutch pedal and abnormal noises in the passenger compartment can be prevented.

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a clutch release cylinder 1 has a cylinder body 2, and a piston 3 is slidably provided within the cylinder body 2. The closed end side of the hydraulic medium space 4 defined by the piston 3 is connected via a port 5 to the clutch master cylinder and to a bleeder plug 6.

FIGS. 2a and 2b show two examples of the shape of the piston 3. FIG. The piston 3 is made of an elastic material such as rubber and is integrally molded, and the main body portion 10 of the piston 3 is formed into a cylindrical side surface shape. In the piston 3 shown in FIG.
In the piston 3 shown in FIG.
It is formed into an annular protruding portion with an angular cross section, that is, a cup shape, at both axial ends of the outer circumferential surface. The seal portions 11a and 11b are for air-tight sealing, and the seal portions 12a and 12b are for oil-tight sealing. A concave recess 13 is formed on one end surface of the main body 10, and a spring seat 14 is formed with a stepped contour on the other end surface.

Returning to FIG. 1, the compression coil spring 18 wound in the shape of a conical side is supported at one end by the spring seat 14 of the piston 3 and at the other end by the closed end wall of the cylinder body 2. Force to the left. The push rod 19 rests at one end 20 on the release fork of the clutch and at the other end 21 is inserted into the recess 13 of the piston 3. The elastic boot 22 is connected to the push rod 1 at one end.
9, and the other end is fixed to the outer peripheral edge of the open end of the cylinder body 2, covering the open end of the cylinder body 2 to prevent dirt and the like from entering into the cylinder body 2.

During clutch operation, when the driver depresses the clutch pedal, the hydraulic pressure in the clutch master cylinder is transmitted to the hydraulic medium space 4, and the hydraulic pressure in the hydraulic medium space 4 increases. In this way, piston 3 moves to push rod 1
9 and release the clutch via the release fork. As a result, engine vibrations are transmitted to the piston 3 through the clutch cover, clutch disk, release bearing, release hub, release fork, and push rod 19 in this order. However, due to its elasticity, the piston 3 expands and contracts in the axial direction with the transmitted engine vibrations, thereby preventing engine vibrations from being transmitted as hydraulic pulsations toward the clutch master cylinder. As a result, abnormal vibrations of the clutch pedal and abnormal noises in the passenger compartment are prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a diagram showing two examples of shapes of the piston. 1...Clutch release cylinder, 2...Cylinder body, 3...Piston.

Claims (1)

[Scope of utility model registration request] A part of the outer periphery of the piston, which is slidably incorporated into the cylinder body, is provided with a sealing protrusion along the circumferential direction that can make direct sliding contact with the inner wall surface of the cylinder body. The piston is characterized by a structure that allows flexural deformation in the axial direction of the piston in order to suppress engine vibration during clutch operation by ensuring a predetermined clearance between the piston and the wall surface along the axial direction. Clutch release cylinder.