JPH0628359U - Hydraulically operated clutch disengagement device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a hydraulically actuated clutch disengagement device, co-rotation of a piston with respect to a clutch spring is prevented to reduce wear of a seal member. [Structure] An inner cylinder 4 coaxially fixed to the input shaft 1 on the clutch housing 2 side, and an annular hydraulic chamber 5 between the inner cylinder 4 and the inner cylinder 4.
An outer cylinder 6 that forms a cylinder, a cylindrical piston 7 that is axially slidably fitted in the hydraulic chamber 5, and a release bearing 8 that is held by the piston 7 and pushes the inner edge of the clutch spring 3. In the push-type hydraulically actuated clutch disengagement device, the release bearing holding portion 10 of the piston 7 is provided with the guide cylinder 11 fitted around the outer circumference of the outer cylinder 6 in a non-rotatable manner with a square fitting surface. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push-type hydraulically actuated clutch disengagement device.

[0002]

[Prior art]

 The push type hydraulically operated clutch disengagement device disengages the clutch by moving the release bearing in the axial direction with hydraulic pressure according to the operating force and pushing the inner edge of the clutch spring via the release bearing. Thus, conventionally, it has a structure as shown in FIG.

In FIG. 3, reference numeral 31 is an input shaft, 32 is a clutch housing, and 33 is a clutch spring. A conventional clutch disengagement device of this type has an inner cylinder 34, an outer cylinder 35, and a cylindrical piston 36. And a release bearing 37.

The inner cylinder 34 and the outer cylinder 35 are provided coaxially with the input shaft 31, and are fixed to the clutch housing 32 via a flange 38 at the ends thereof. An annular hydraulic chamber 39 is formed between the inner cylinder 34 and the outer cylinder 35. The hydraulic chamber 39 is supplied with hydraulic oil having a pressure corresponding to the operating force from a master cylinder (not shown). The piston 36 is slidably inserted in the hydraulic chamber 39 in the axial direction. A seal member 40 is attached to the tip of the piston 36, and a holding portion 41 of the release bearing 37 is provided at the outer end. There is. The release bearing 37 is held by the piston 36 by the holding portion 41, and the pressing portion formed on the inner ring 37 a pushes the inner edge of the clutch spring 33.

Reference numeral 42 is a coil spring that applies an elastic force to the release bearing 37 so that it is always in contact with the clutch spring 33. The coil spring 42 is interposed between the bearing holding portion 41 of the piston 36 and the flange 38 of the outer cylinder 35. ing.

[0006]

[Problems to be solved by the device]

 By the way, in the conventional device, the outer ring of the release bearing 37 may rotate following the inner ring as the clutch spring 33 rotates, and the entire piston 36 may rotate together with the clutch spring 33. In this way, when the piston 36 rotates together, the amount of sliding contact between the seal member 40 at the tip of the piston 36 and the inner surface of the hydraulic chamber 39 increases, and the seal member 40 is abraded and the life is shortened.

In view of the above conventional problems, it is an object of the present invention to prevent co-rotation of a piston with respect to a clutch spring and reduce wear of a seal member.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an annular hydraulic chamber between an inner cylinder fixed coaxially with the input shaft on the clutch housing side and an inner cylinder fixed on the clutch housing side. Of the push type equipped with an outer cylinder that forms a cylinder, a cylindrical piston that is slidably inserted in the hydraulic chamber in the axial direction, and a release bearing that is held by a piston and pushes the inner edge of the clutch spring. The hydraulically operated clutch disengagement device has the following structure.

In the hydraulically actuated clutch disengagement device of the present invention, a guide cylinder extending to the outer circumference of the outer cylinder is attached to the release bearing holding portion of the piston, and the guide cylinder has an angular fitting surface and is formed into an outer cylinder. It is fitted non-rotatably to.

[0010]

[Action]

 In the above structure, since the guide cylinder provided on the piston side is fitted to the outer cylinder on the clutch hanging side through the square fitting surface, rotation is blocked and the guide cylinder rotates together with the clutch spring. Never.

[0011]

【Example】

 Hereinafter, details of the present invention will be described based on an embodiment shown in FIGS. 1 and 2. FIG. 1 is a half sectional view of a hydraulically actuated clutch disengagement device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part taken along line (2)-(2) of FIG.

In these drawings, reference numeral 1 is an input shaft, 2 is a clutch housing, and 3 is a clutch spring.

The clutch disengagement device of this embodiment is basically an inner cylinder 4 fixed coaxially with the input shaft 1 to the clutch housing 2 side, and an inner cylinder 4 fixed to the clutch housing 2 side. An outer cylinder 6 that forms an annular hydraulic chamber 5, a cylindrical piston 7 that is axially slidably fitted into the hydraulic chamber 5, and an inner edge of the clutch spring 3 that is held by the piston 7. It is the same as the above-mentioned conventional push type device in that it is provided with a release bearing 8 for pushing.

The inner cylinder 4 and the outer cylinder 6 are fixed to the clutch housing 2 via flanges 4a and 6a at the ends, respectively. A seal member 9 is attached to the tip of the piston 7 for insertion and insertion, and a holding cover 10 serving as a holding portion for the release bearing 8 is integrally provided at the outer end.

A feature of the present invention is that the holding cover 10 is provided with a guide tube 11. The guide cylinder 11 is attached to the holding cover 10 by the flange 11 a, and the main body portion thereof extends to the outer circumference of the outer cylinder 6. The inner peripheral surface of the guide cylinder 11 and the outer peripheral surface of the outer cylinder 6 are formed in the same polygonal (octagonal in this embodiment) cross-sectional shape as shown in FIG. It is fitted in a shape.

A coil spring 12 for constantly contacting the release bearing 8 with the clutch spring 3 is compression-inserted between the flange 11a of the guide cylinder 11 and the flange 6a of the outer cylinder 6, and the outer circumference thereof is The bellows-shaped boot 13 is provided on the.

In the above structure, the guide cylinder 11 provided on the piston 7 side is fitted to the clutch housing 2 side with the fixed outer cylinder 6 via the square fitting surface, so that the rotation is prevented. , It does not rotate together with the clutch spring 3.

Since the coil spring 12 is expanded and contracted by being guided by the outer peripheral surface of the guide cylinder 11, its position does not change even if the expansion and contraction are repeated. Further, since the piston 7 is prevented from rotating together, the piston 7 and the outer cylinder 6 are held at the same angular position, so that the boot 13 provided between the piston 7 and the outer cylinder 6 should be fitted to both without a gap. Will be possible.

[0019]

[Effect of device]

 As described above, according to the present invention, the co-rotation of the piston with respect to the clutch spring is prevented, so that the wear of the seal member at the piston tip can be greatly reduced compared to the conventional one, and the life is improved. it can.

[Brief description of drawings]

FIG. 1 is a half sectional view of a hydraulically actuated clutch disengagement device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part taken along the line (2)-(2) of FIG.

FIG. 3 is a half sectional view of a conventional hydraulically operated clutch disengagement device.

[Explanation of symbols]

 1 Input Shaft 2 Clutch Housing 3 Clutch Spring 4 Inner Cylinder 5 Hydraulic Chamber 6 Outer Cylinder 7 Piston 8 Release Bearing 10 Holding Cover (Bearing Holding Part) 11 Cover Cylinder

Claims (1)

[Scope of utility model registration request] 1. An inner cylinder fixed to the clutch housing side coaxially with the input shaft, an outer cylinder fixed to the clutch housing side to form an annular hydraulic chamber between the inner cylinder and the inner cylinder. A push-type hydraulically actuated clutch disengagement device comprising a cylindrical piston that is slidably inserted in an axial direction and a release bearing that is held by the piston and pushes the inner edge of the clutch spring. A hydraulic pressure characterized in that a guide cylinder extending to the outer periphery of the outer cylinder is attached to the holding portion, and the guide cylinder is non-rotatably fitted to the outer cylinder with a square fitting surface. Actuated clutch disengagement device.