JP3299008B2 - Hydraulic clutch release cylinder device - Google Patents

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 hydraulic clutch 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 type clutch release cylinder device.

[0002]

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

On the other hand, the output transmission capacity of the clutch must be increased with the increase in the output of the engine, and the release operation force of the clutch tends to increase with this. Therefore, in recent years, reduction of operating force has become an important issue in designing a clutch release mechanism.

In order to reduce the treading force in the conventional type, for example, it is conceivable to increase the bore of the slave cylinder, add a booster utilizing negative pressure of the intake air, or lengthen the release fork. It is difficult to say that it is preferable because the external dimensions are increased.

[0005] As a device that can solve such inconvenience, a slave cylinder provided concentrically with the input shaft is used.
C that can drive the release bearing 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 in the annular groove slidably in the axial direction and to supply the hydraulic pressure of the master cylinder from the bottom of the annular groove.By using a cylindrical piston, a large pressure receiving area can be reduced. It can be obtained in a configuration.

[0006]

The CSC described above
In the release device of the formula, the slave cylinder having the annular groove is provided for the purpose of sliding the annular cylinder in a liquid-tight manner.
Since the inner surface of the annular groove needs to be finished with extremely high precision and the bottom has an oil supply port and an air vent, it is relatively troublesome to manufacture.

The present invention has been devised in order to solve such disadvantages of the prior art, and a main object of the present invention is to provide a hydraulic clutch release cylinder device configured to simplify a manufacturing process. To provide.

According to the present invention, there is provided a cylinder including an annular groove which is deep along an axial direction of an input shaft of a transmission and is coaxial with the input shaft, a cylinder which is received by the annular groove, and A hydraulic clutch release cylinder device having an annular piston pushed out by hydraulic pressure in the annular groove, and a release bearing fixed to an outer end of the annular piston, wherein the cylinder comprises a cylindrical portion and an outward flange. And the cylindrical portions of these two members are coaxially arranged inside and outside in a space for receiving the piston, and the flange portions are overlapped with each other. Join together
And, between the flange portions, a pipe connection connector
This is attained by providing a hydraulic clutch release cylinder device characterized in that at least a part thereof and a sealing means are sandwiched .

[0009]

According to such a configuration, the annular groove is formed by combining the cylindrical portions of the two members in the inner and outer portions, so that the inner surface of the annular groove can be relatively easily subjected to precision machining. . In addition, the annular groove can be very easily formed in a liquid-tight manner by joining the flange portion through a seal member such as a gasket. By providing a suitable notch in the seal member, the hydraulic pressure supply passage can be easily formed.

[0010]

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

FIGS. 1 and 2 show a clutch release cylinder device constructed in accordance with the present invention. The upper side from the center line in FIG. 1 shows a clutch disengaged state, and the lower side shows a clutch engaged state. . The clutch release cylinder device 1 includes a cylinder 2 fixed to a transmission housing side, an annular piston 4 slidably fitted in an annular groove 3 formed in the cylinder 2, and a bearing seat 5 fixed to an outer end of the annular piston 4. And is mounted coaxially with the input shaft 7 of the transmission.

The cylinder 2 includes cylindrical portions 8a and 8b, and flange portions 9a and 9b formed at one ends of the cylindrical portions so as to face outward.
And two members are combined. These two members are formed by drawing a metal material, the diameters of the cylindrical portions 8a and 8b are different from each other, and the flange portions 9a
The outer contours of 9b are equal. The input shaft 7 is provided between the two cylindrical portions 8a and 8b which are combined in an inner and outer double.
The annular groove 3 is formed deeper along the axis of.
In addition, the flange portions 9a and 9b of the two members are joined together with the gasket 10 interposed therebetween, so that the liquid-tightness of the joined portion is maintained.

The flange portions 9a and 9b of the two members have
Both have a pair of ears 11 on the radius line. A circular hole 12 is formed in an ear formed on the flange portion 9a of the member whose cylindrical portion is located on the outer peripheral side of the two members. 14 are fitted. And this flange
By joining the other flange portion 9b to the portion 9a,
The enlarged proximal end as a part of the connector member 13
O-ring 14 as a tool means
9a and 9b are sandwiched between the connector members 13
It is fixed to the unit 11.

The connector member 13 has a pipe joint 15 bent into an L-shape, and an O-ring 16 at its end.
And fitted. A flange portion 17 is formed at an end of the pipe joint 15, and the pipe joint 15 is prevented from coming off by inserting a pin 18 in the shape of a pin so as to press the flange portion 17 into the connector member 13. ing. The gasket 10
Are arranged so as to bypass the connector member 13 to the outside, whereby a gap 19 is formed between the flange portions 9a and 9b. The gap 19 forms a hydraulic passage extending from the pipe joint 15 to the annular groove 3.

The annular piston 4 received in the annular groove 3 so as to be slidable in the axial direction is slidably fitted in the annular groove 3 in a liquid-tight manner with a seal member 20 provided at an inner end thereof. Also,
The annular piston 4 has a diaphragm spring 2 that is displaced in accordance with wear of a clutch facing (not shown).
In order to follow the inner end position of the release bearing 6 and press the release bearing 6, the preload spring 22 which is contracted around the cylinder 2 is constantly urged with a small load in the pushing direction.

The preload spring 22 has one end 2 thereof.
2a is fixed to the outer end of the annular piston 4 and the other end 22
b is locked to the connector member 13. The torsion resistance of the preload spring 22 prevents the annular piston 4 from rotating. Preload spring 22
Is surrounded by a bellows-shaped dust boot 23 connected between a retainer member 25 integrally formed with the caulking fittings of the flange portions 9a and 9b and an outer end of the annular piston 4. Is prevented from adhering to the annular piston 4. In FIG. 2, the preload spring 22 and the dust boot 23 are not shown.

The release bearing 6 has a self-aligning mechanism, and a contact flange 24 fixed to the inner race uniformly contacts the center of the diaphragm spring 21 in the circumferential direction.

Next, the operation of the above embodiment will be described.

When the clutch pedal is not depressed, that is, when no oil pressure is applied, the release bearing 6 is pressed by the diaphragm spring 21 and is located on the transmission housing side. In this state, the pressure plate (not shown) presses the clutch disk toward the flywheel due to the reaction force of the diaphragm spring 21 to transmit the power of the engine to the transmission.

A hydraulic pressure from a master cylinder (not shown) enters the annular groove 3 through the gap 19 between the flange portions 9a and 9b via one pipe joint 15, and pushes out the annular piston 4. Thereby, the annular piston 4
The release bearing 6 is pushed out together with the bearing sheet 5 provided integrally with the diaphragm spring 21 to press the center of the diaphragm spring 21 to release the pressing force of the pressure plate. This disengages the clutch disc from the flywheel and cuts off transmission of engine power to the transmission.

[0021]

As described above, according to the present invention, the annular cylinder is a combination of a cylindrical portion and a flange portion, and the outer peripheral surface of one cylindrical portion and the inner peripheral surface of the other cylindrical portion have an annular groove. Is formed, precision machining of the annular groove can be performed relatively easily. In addition, since the flange portion is joined via the gasket to sandwich the connector portion, the axial dimension can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a partially cutaway side view of the hydraulic clutch release cylinder device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic clutch release cylinder device 2 Cylinder 3 Annular groove 4 Annular piston 5 Bearing seat 6 Release bearing 7 Input shaft 8a ・ 8b Cylindrical part 9a ・ 9b Flange part 10 Gasket 11 Ear part 12 Round hole 13 Connector member 14 O-ring 15 Pipe Joint 16 O-ring 17 Flange 18 Pin 19 Clearance 20 Sealing member 21 Diaphragm spring 22 Preload spring 23 Dust boot 24 Contact flange 25 Retainer member

Claims (1)

(57) [Claims] 1. A cylinder having an annular groove that is deep along an axial direction of an input shaft of a transmission and is coaxial with the input shaft, and is received by the annular groove and is extruded by hydraulic pressure in the annular groove. A hydraulic clutch release cylinder device having an annular piston and a release bearing fixed to an outer end of the annular piston, wherein the cylinder includes two members having a cylindrical portion and an outward flange portion, The cylindrical portions of these two members are coaxially arranged inside and outside with a space for receiving the piston, and the flange portions are connected to each other.
Superimposed and joined together, and between the flanges
And at least a part of a pipe connection connector and a sealing means.
And a hydraulic clutch release cylinder device.