JPS6218744Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-adjustable clutch release cylinder device that can prevent engine vibrations from being transmitted to a clutch pedal during clutch operation.

For vehicles with a hydraulic clutch operation mechanism,
When operating the clutch, an abnormal vibration of the clutch pedal is often felt which impairs the clutch operation interval. This is because engine vibrations caused by engine operation are transmitted through the clutch diaphragm spring, etc. to the clutch release fork and the push rod of the clutch release cylinder device to the piston in the clutch release cylinder device. This is thought to be because the vibration is transmitted to the piston of the clutch master cylinder device through the hydraulic medium of the release system, and this vibration is transmitted to the clutch pedal through the push rod and U-link (clevis) of the clutch master cylinder device.
Abnormal clutch pedal vibration is particularly noticeable in diesel engine vehicles, and can also cause resonance in the dash panel, causing abnormal noise.

Conventionally, in order to prevent this abnormal vibration, devices have been devised that are equipped with a vibration prevention device in the path of the clutch release cylinder device and clutch pedal, but there are problems such as the structure of the clutch system being complicated. It was hot.

The purpose of the present invention is to improve a non-adjustable clutch release cylinder device (hereinafter simply referred to as the clutch release cylinder device) to create a clutch release cylinder device with a vibration-proofing function, which has a simple structure. Further, it is an object of the present invention to provide a non-adjustable clutch release cylinder device that can prevent engine vibrations from being transmitted to a clutch pedal during clutch operation and eliminate abnormal vibrations and noise of the clutch pedal.

Next, first and second embodiments of this invention will be described based on the accompanying drawings.

(Embodiment 1) FIG. 1 schematically shows the entire hydraulic clutch operating mechanism.

As the clutch pedal 1 in the driver's seat swings, the piston of the clutch master cylinder device 2 moves in the axial direction, and the hydraulic pressure generated in this way is transmitted to the clutch release cylinder device 4 via the flexible hose 3. The device 4 operates via a push rod 5 a release fork 7 as a release mechanism of the clutch device 6.

FIG. 2 shows details of the clutch release cylinder device 4. The cylinder 10 is open at one end, the push rod 5 extends through this open end, and a boot 11 that is expandable and retractable in the axial direction connects the outer circumferential wall of the open end of the cylinder 10 and the outer circumferential surface of the push rod 5. are attached to both ends of the cylinder 10 to prevent dirt and the like from entering into the cylinder 10 from the open end of the cylinder 10. A cylinder oil chamber 12 is formed within the cylinder 10. The cylinder oil chamber 12 is defined in the axial direction by a first piston 13 on one side and a second piston 14 on the other side. This second piston 14 is supported on the non-piston side of the cylinder oil chamber 12 within a recess 14a having a stepped portion 36 on its outer periphery. Cylinder oil chamber 12 is cylinder 1
0 is connected to the cylinder oil chamber 12 of the clutch master cylinder device 2 through an external connection port 15.
Further, the cylinder oil chamber 12 is connected to an air bleeder plug 17 outside the cylinder 10 via a passage 16. The first piston 13 is connected to the boot 11
A recess 20 for receiving the end of the push rod 5 is formed on the side end face, a seal cup 21 is provided on the end face on the cylinder oil chamber 12 side, and another seal cup 23 is provided in the annular groove 22 on the outer periphery. A spring seat 31 is provided at the end of the first piston 13 on the cylinder oil chamber 12 side.
is provided, and a coil spring 32b that urges the first piston 13 toward the push rod 5 is connected to the cylinder oil chamber 1.
It is supported by a step portion 36 provided on the outer periphery of 2.

The second piston 14 has an annular groove 25 on its outer periphery in which a seal cup 24 is provided, and a rubber 27 as an elastic support member is attached to the end surface of the cylinder 10 on the closed end wall 26 side. The rubber 27 is
The second piston 14 is formed into a cylindrical shape with a predetermined length.
It fits into the center protrusion 28 of. Further, a hole 33 is provided at the center of the closed end wall 26, and communicates the cylinder interior space 34 in which the rubber 27 is disposed to the outside.

FIG. 3a is a perspective view of the rubber 27 attached to the second piston 14, and FIGS. 3b and 3c are views of the second piston 1.
4 and rubber 27 are shown separately. Instead of the rubber 27, a spring 30 can also be provided, as shown in FIG. 4a. spring 30
includes a cylindrical coil spring 30a (Fig. 4b),
Alternatively, a truncated conical coil spring 30b (FIG. 4c) can be used.

When operating the clutch, press clutch pedal 1 in the driver's cab.
is depressed, hydraulic medium is sent from the cylinder oil chamber of the clutch master cylinder device 2 to the cylinder oil chamber 12, and the first piston 13 moves toward the open end of the cylinder 10. As a result, the push rod 5 operates the release fork 7, and the clutch becomes released. During such clutch operation, the pressure is transmitted to the hydraulic medium in the cylinder oil chamber 12 via the diaphragm spring of the clutch device 6, the release fork 7, and the first piston 13. However, as the rubber 27 expands and contracts in relation to the vibrations of the first piston 13, the second piston 14 vibrates in response to the vibrations of the first piston 13. The accompanying increase or decrease in the volume of the cylinder oil chamber 12 is suppressed, the oil pressure is maintained substantially constant, and transmission of engine vibrations to the clutch pedal 1 and clutch master cylinder device 2 is prevented.

In addition, Fig. 6 shows a reference example of the clutch release cylinder device, and this reference example is similar to the first one.
A spring seat 31 is provided at the end of the piston 13 on the cylinder oil chamber 12 side, and the spring seat 31 and the second piston 1
This is a non-adjustable clutch release cylinder device in which a truncated cone-shaped coil spring 32 is provided between the four parts. However, according to this reference example, as the clutch disk of the clutch device 6 wears, the position of the first piston 13 during clutch operation changes toward the closed end wall 26 of the cylinder 10, and the position of the first piston 13 changes toward the closed end wall 26 of the cylinder 10. As the clutch disk wears, the rubber 27 is compressed in the axial direction, and as shown in FIG. 5, the axial deflection of the rubber 27 and the oil pressure in the cylinder oil chamber 12 change as the clutch disk wears. . Here, in FIG. 5, the solid line indicates the characteristic when there is almost no wear on the clutch disk, and the broken line indicates the characteristic when the amount of wear on the clutch disk increases, and the position of the first piston 13 moves toward the closed end wall 26 of the cylinder 10. This is the characteristic when the clutch disk changes, and the deflection-hydraulic characteristic changes as the clutch disc wears. It is undesirable for the initially set deflection-hydraulic characteristics to change as a result of wear of the clutch disk.
In this first embodiment, since the coil spring 32 is supported by the stepped portion 36 and the second piston 14 is not in contact with the coil spring 32, the rubber 27 is not affected by the wear of the clutch disk, so that the rubber 27 is not bent. - Hydraulic characteristics can be maintained well regardless of clutch disc wear.

(Example 2) Next, Example 2 will be explained.

Example 2 is an improvement on Example 1, and includes:
As shown in FIG. 7, a snap ring 38 is provided on the peripheral wall of the cylinder oil chamber 12 to restrict movement of the second piston 14 toward the first piston 13. Thereby, a predetermined initial load is applied to the rubber 27. FIG. 8 is a graph showing the relationship between the deflection of the rubber 27 and the oil pressure in the cylinder oil chamber 12. In the range where the deflection of the rubber 27 is less than F, there is no damping effect, and in order to obtain the damping effect of the rubber 27, It can be seen that the deflection of the rubber 27 must be greater than F, and that deflection less than F becomes an invalid amount (lost stroke). In this second embodiment, since an initial load equivalent to P or more in FIG. 8 is applied to the arm 27 by the snap spring 38,
The damping effect of the rubber 27 can be improved.

As described above, according to this invention, hydraulic pressure is supplied from the clutch master cylinder device to the cylinder oil chamber in the cylinder, and the first
A spring that pushes back the first piston is disposed on the hydraulically acting side of the piston, and a push rod that moves integrally with the first piston is provided on the first piston side of the spring. In the non-adjustable clutch release cylinder device in which the release mechanism of the clutch device is operated by using a clutch device, a recessed portion with a step on the outer periphery is formed on the non-piston side of the cylinder oil chamber, and the non-piston side end of the spring is formed with a recessed portion on the non-piston side. The structure of the Clutch Series is achieved by supporting the stepped portion of the cylinder oil chamber and installing a second piston inside the recess that operates in the axial direction of the cylinder via an elastic member. It is simple and can reliably prevent engine vibration from being transmitted to the clutch pedal via the hydraulic medium without causing wear on the clutch disk, thereby preventing abnormal noise and abnormal vibration of the clutch pedal. .

[Brief explanation of the drawing]

Fig. 1 is a diagram schematically showing the entire hydraulic operating mechanism, Figs. 2 to 5 show Embodiment 1, Fig. 2 is a sectional view of the clutch release cylinder device, and Fig.
The figure shows the second piston and the rubber in detail, FIG. 4 shows the second piston and the spring in detail,
FIG. 5 is a graph showing the relationship between the deflection of the elastic member that supports the second piston in the cylinder and the oil pressure in the cylinder oil chamber. FIG. 6 is a sectional view showing a reference example of the clutch release cylinder device. 7th
8 show Example 2, FIG. 7 is a sectional view of the clutch release cylinder device, and FIG. 8 is a graph showing the effective range of deflection of the elastic member supported on the second piston. 2...Clutch master cylinder device, 4...Clutch release cylinder device, 5...Push rod, 6
...Clutch device, 7...Release fork, 1
0...Cylinder, 12...Cylinder oil chamber, 13...
...First piston, 14...Second piston, 2
7...Rubber, 30...Spring, 36...Step part.

Claims (1)

[Scope of utility model registration request] Hydraulic pressure is supplied from the clutch master cylinder device to a cylinder oil chamber in the cylinder, and a spring that pushes back the first piston is disposed on the hydraulic action side of a first piston that partitions the inside of the cylinder oil chamber. In the non-adjustable clutch release cylinder device, a push rod that moves integrally with the first piston is provided on the piston side of the first piston, and the release mechanism of the clutch device is operated via the push rod. A recess with a step on the outer periphery is formed on the piston side, and the non-piston end of the spring is supported by the step of the cylinder oil chamber, and the cylinder is inserted into the recess through an elastic member. A non-adjustable clutch release cylinder device, characterized in that a second piston that operates in the axial direction is installed.