JPH07158659A - Hydraulic clutch release cylinder device - Google Patents

Abstract

PURPOSE:To provide a hydraulic clutch release cylinder device constituted in such a way as to further simplify the fitting part structure of a release bearing. CONSTITUTION:A hydraulic clutch release cylinder device has a cylinder 2 with a ring groove 3 formed deep along the axial direction of the input shaft 7 of a transmission and coaxially with the input shaft 7, and a cylindrical piston 4 receiver in the ring groove 3 in such a way as to be relatively deformable in the axial direction to the cylinder 2. In such a hydraulic clutch release cylinder device for imparting displacement along the axial direction of the input shaft 7 to a release bearing 6, the cylindrical piston 4 is fixed to a clutch housing CH, and the release bearing 6 is fitted to the cylinder 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic clutch release cylinder device, and more particularly to a liquid clutch type release cylinder device in which a slave cylinder is provided coaxially with an input shaft of a transmission and a release bearing is directly driven by a piston of the slave cylinder. The present invention relates to a pressure clutch release cylinder device.

[0002]

2. Description of the Related Art Conventionally, as a vehicle clutch, a slave cylinder is stroked by a hydraulic pressure generated by a master cylinder directly connected to a clutch pedal, thereby moving a release bearing along an axial direction via a release fork, A release mechanism configured to press the central portion of the diaphragm spring with this release bearing to displace the pressure plate is widely used.

On the other hand, the output transmission capacity of the clutch must be increased as the output of the engine is increased, and the release operation force of the clutch is also increasing accordingly. Therefore, in recent years, reduction of the operating force has become an important issue in designing the release mechanism of the clutch.

Incidentally, in order to reduce the pedaling force in the conventional manner, for example, it is conceivable to increase the bore of the slave cylinder, add a booster device utilizing negative suction pressure, and lengthen the release fork. It is difficult to say that it is preferable because it causes an increase in external dimensions.

In order to improve such inconvenience, a slave cylinder concentrically provided with the input shaft allows
C that allows the release bearing to be driven directly
An oncentric Slave Cylinder (CSC) type release device has been proposed in US Pat. No. 4,983,332 and the like. This is to receive a cylindrical piston slidably in the annular groove in the axial direction and supply the hydraulic pressure of the master cylinder from the bottom of the annular groove.By using the cylindrical piston, a large pressure receiving area can be made compact. Can be obtained in configurations.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In a conventional release device, a slave cylinder having an annular groove is generally fixed to a clutch housing. In other words, the release bearing is attached to the cylindrical piston that is the movable member, but in order to avoid an increase in the axial dimension, use a connection fitting that is bent so that it does not interfere with the slave cylinder, and use the connecting piston in the axial direction from the end surface of the cylindrical piston. The release bearing is mounted at a position where it does not protrude. Therefore, reduction of the number of parts and manufacturing man-hours has been hindered.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
It is an object of the present invention to provide a hydraulic clutch release cylinder device configured to further simplify the structure of the release bearing mounting portion.

[0008]

According to the present invention, such an object is to provide a cylinder having an annular groove deep along the axial direction of the input shaft of the transmission and coaxial with the input shaft. The cylinder and a cylindrical piston received in the annular groove so as to be displaceable in the axial direction,
A hydraulic clutch release cylinder device for applying a displacement to the release bearing along the axial direction of the input shaft is configured such that the tubular piston is fixed to the clutch housing and the release bearing is attached to the cylinder. To be achieved.

[0009]

According to this structure, since the cylinder side is the movable member, the release bearing can be directly attached to the inner surface of the inner peripheral wall of the movable member, so that the structure of the attaching portion of the release bearing is simplified.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

FIGS. 1 and 2 show a clutch release cylinder device constructed according to the present invention. The upper side from the center line in FIG. 1 shows the clutch contact state, and the lower side shows the clutch disengagement state. There is. This clutch release cylinder device 1 includes a cylindrical piston 2 fixed on the clutch housing CH side, a cylinder 4 having an annular groove 3 formed therein for sliding the cylindrical piston 2 in a sliding manner, and a bearing seat 5 on the bottom side of the cylinder 4. It is composed of a release bearing 6 which is fixed via a shaft, and is mounted coaxially with the input shaft S of the transmission.

The cylinder 4 is a combination of two members, which are cylindrical portions 4a and 4b and flange portions 4c and 4d which are formed at one end of the cylindrical portions 4a and 4b so as to face outward in the radial direction. These two members are formed by drawing a metal material, and the diameters of the cylindrical portions 4a and 4b are different from each other.
Moreover, the outer contours of the flange portions 4c and 4d are made equal to each other. And both cylindrical parts 4a that are combined inside and outside
4b, an annular groove 3 deepened along the axis of the input shaft S
Are formed. In addition, the flange portion 4c of the two members
The 4d members are arranged such that a sealing member 7 such as an O-ring is sandwiched between them and the outer peripheral portion is caulked with a rivet 8 so that liquid tightness of the joint portion is maintained. Further, on the bottom surface of the cylinder 4, a bearing holding plate 9
Are superposed and fastened together by the rivets 8 described above.

The bearing seat 5 includes a seat portion 5a that engages with the outer race of the release bearing 6 and a sleeve portion 5 that fits on the inner peripheral surface of the inner cylindrical portion 4a of the cylinder 4.
b, and is formed by bending a metal plate.
A flange 4e is formed inwardly in the radial direction at the opening side edge of the annular groove 3 in the inner cylindrical portion 4a of the cylinder 4, and the bearing seat 5 is formed on the flange 4e.
The inner end of the sleeve portion 5b in the axial direction abuts, and the bearing seat 5 moves in the axial direction together with the cylinder 4. Further, the preload spring 11 compressed on the inner peripheral side of the cylinder 4 is pressed so that the release bearing 6 is pressed against the inner end position of the diaphragm spring 10 which is displaced according to the wear of the clutch facing (not shown). Thus, the bearing seat 5 is always urged with a low load in the pushing direction.

A radially outward contact flange 12 is fixed to the inner race of the release bearing 6. Here, the release bearing 6 has a self-aligning mechanism, and the contact flange 12 uniformly abuts on the central portion of the diaphragm spring 10 in the circumferential direction.

The cylindrical piston 2 is liquid-tightly fitted in the annular groove 3 with a seal member 13 provided at the inner end thereof. An appropriate number of axial grooves 14 are provided on the outer peripheral surface of the tubular piston 2, and the inward projection is provided on a dust seal 15 fitted to the open end side of the outer cylindrical portion 4b of the cylinder 4. The rotation of the cylinder 4 is restricted by engaging the projection 15a with the axial groove 14.

A pair of connector portions 16 are formed on the radial line at the outer end portion (fixed end with respect to the clutch casing CH) of the cylindrical piston 2. A pipe joint mounting hole 17 is formed at the center of the connector portion 16, and a pipe joint 18 is fitted in the mounting hole 17 with an O-ring 19 mounted at its end. At the inner end of the pipe joint 18, a collar portion 20
The pipe joint 18 is prevented from coming off by inserting the pin 21 in the shape of a pin into the connector portion 16 so as to press the collar portion 20. The pipe joint mounting hole 17 and the axial end surface on the inner end side of the tubular piston 2 communicate with each other through a passage 22 provided in the tubular piston 2.

Next, the operating procedure of the above embodiment will be described.

When the clutch pedal is not depressed, that is, when the hydraulic pressure is not applied, the release bearing 6 is pressed by the diaphragm spring 10 and is on the clutch housing CH side. In this state, the reaction force of the diaphragm spring 10 causes a pressure plate (not shown) to press the clutch disc toward the flywheel, and the power of the engine is transmitted to the transmission.

When the clutch pedal is depressed, hydraulic pressure from a master cylinder (not shown) enters the annular groove 3 from the passage 22 in the cylindrical piston 2 through the one pipe joint 18, and pushes out the cylinder 4. As a result, the release bearing 6 is pushed out together with the bearing seat 5 provided integrally with the cylinder 4, and the central portion of the diaphragm spring 10 is pushed to release the pushing force of the pressure plate. This disengages the clutch disc from the flywheel and interrupts the transmission of engine power to the transmission. The other pipe joint is used for bleeding air.

FIG. 3 shows a modified embodiment of the present invention. Flange 4c, 4 of the cylinder 4 of the first embodiment
While d is outward, it is formed inward in this embodiment. According to this, the outer diameter of the cylinder portion is reduced, and the bearing pressing plate 9 can be omitted.

FIG. 4 shows another modified embodiment of the present invention. Whereas the bottom of the cylinder 4 in the above two embodiments is a flange connection, in this embodiment, it is welded. In this case, since the flanges 4c and 4d are not provided, the seal member 7 can be omitted.

[0022]

As described above, according to the present invention, since the release bearing can be mounted on the inner peripheral surface of the inner cylindrical portion of the cylinder, the structure for mounting the release bearing is simplified, and the axial dimension of the clutch release cylinder device. It is possible to achieve a great effect in reducing

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a clutch release cylinder device according to the present invention.

FIG. 2 is a left side view of the clutch release cylinder device according to the present invention, partially cut away.

FIG. 3 is a partial vertical sectional view of a modified embodiment of the device of the present invention.

FIG. 4 is a partial vertical sectional view of another modified embodiment of the device of the present invention.

[Explanation of symbols]

 CH Clutch housing S Input shaft 1 Clutch release cylinder device 2 Cylinder 3 Annular groove 4 Cylindrical piston 4a, 4b Cylindrical part 4c-4e Flange part 5 Bearing seat 5a Seat part 5b Sleeve part 6 Release bearing 7 Sealing member 8 Rivet 9 Bearing Pressing plate 10 Diaphragm spring 11 Preload spring 12 Contact flange 13 Seal member 14 Axial groove 15 Dust seal 15a Protrusion 16 Connector part 17 Pipe joint mounting hole 18 Pipe joint 19 O-ring 20 Collar part 21 Pin 22 Passage

Claims (1)

[Claims] 1. A cylinder having an annular groove deep along the axial direction of an input shaft of a transmission and coaxial with the input shaft, and a cylinder which is relatively displaceable in the axial direction with the cylinder. A hydraulic clutch release cylinder device for applying a displacement along the axial direction of the input shaft to the release bearing, wherein the tubular piston is fixed to the clutch housing, and the release bearing is A hydraulic clutch release cylinder device mounted on the cylinder.