JP2005265072A - Hydraulic clutch release unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic clutch release unit capable of reducing maximum manufacturing costs. <P>SOLUTION: In the hydraulic clutch release unit 1 capable of keeping a clutch in a blocked state so that an oil chamber 17 is formed between an internal housing 11 and an external housing 12 by means of the internal housing 11, the external housing 12, and a piston member 13 and the piston member 13 and a release bearing are moved to an axial direction of a rotary transmitting shaft 2 by means of oil pressure in the oil chamber, the hydraulic clutch release unit 1 comprises a tube member 16 arranged between the external housing and piston member and likely come into contact with the internal housing, a first seal member 14 arranged between the external housing and piston member and also arranged between the external housing and tube member, and a second seal member 15 arranged between the internal housing and piston member and following together with a movement of the piston member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  According to the present invention, a hydraulic chamber is formed between the inner housing and the outer housing by the inner housing, the outer housing, and the piston member, and the piston member and the release bearing are connected to the shaft of the rotation transmission shaft by the hydraulic pressure in the hydraulic chamber. The present invention relates to a hydraulic clutch release device that moves in a direction to disengage a clutch.

  A release bearing having a sleeve that is externally fixed to an input shaft of a transmission and has an annular cylinder formed on the outer periphery thereof, and a cylindrical piston that is slidably attached to the sleeve and is fitted into the cylinder. Various types of hydraulic clutch units (hydraulic clutch release devices) including a support member for support and a seal member that is disposed on an end surface of the piston portion and seals a sliding portion between the piston portion and the cylinder portion are disclosed in various literatures. It is disclosed (for example, see Patent Document 1).

  In the hydraulic clutch release device having such a structure, since the seal member (seal ring) slides on the inner wall surface of the cylinder portion, the inner wall surface is highly accurate on both the inside and the outside and has good surface properties. There is a need. Therefore, in the case of a metal cylinder, the processing cost is high, and in the case of a resin cylinder, there are problems such as sinking of the sliding surface and a falling gradient, which makes it difficult to manufacture.

  In view of such a problem, the seal member is divided into two, and the second seal member fixed to the piston member slides only on the outer peripheral surface of the inner housing, and is further fixed to the outer housing. There has been proposed a hydraulic clutch release device that slides on the outer peripheral surface of the piston member. By adopting such a structure, the outer housing only needs to have high precision in the vicinity where the first seal member is accommodated, and therefore, it is possible to reduce the number of parts required for processing the housing. Therefore, an inexpensive hydraulic clutch release device can be provided, and the seal member can be covered (covered) in the oil passage hole even when the clutch friction material is worn and the neutral position of the piston moves toward the back of the cylinder. Therefore, the shaft length of the hydraulic clutch release device can be set compactly (see Patent Document 2).

JP-A-1-176816 German Patent Application No. 4227942 (1995)

  However, even in the structure described in Patent Document 2, the housing structure for the first seal member of the outer housing always requires cutting, and there is a problem that the manufacturing cost of the housing cannot be reduced to the maximum. In addition, since the first seal member must be assembled in the inner peripheral groove of the outer housing, it is necessary to take an assembling means that bends the second seal to the inner diameter side, inserts it into the groove, and then widens it. There are drawbacks.

  A first object of the present invention is to provide a hydraulic clutch release device that can reduce the manufacturing cost to the maximum.

  The second object of the present invention is to provide a hydraulic clutch release device capable of improving productivity.

  In a first aspect of the present invention, in a hydraulic clutch release device, an annular inner housing that surrounds a rotation transmission shaft, an outer housing that surrounds the inner housing, and between the inner housing and the outer housing. An annular piston member accommodated so as to be movable in the axial direction of the rotation transmission shaft, a release adjacent to the piston member in the axial direction of the rotation transmission shaft, and movable in the axial direction of the rotation transmission shaft A bearing, a tube member disposed between the outer housing and the piston member, and abutting against the inner housing; a tube member disposed between the outer housing and the piston member; and the outer housing; A first seal member disposed between the tube members, and between the inner housing and the piston member. And a second seal member that follows the movement of the piston member, and a hydraulic chamber is formed between the inner housing and the outer housing by the inner housing, the outer housing, and the piston member. The piston member and the release bearing are moved in the axial direction of the rotation transmission shaft by the hydraulic pressure in the hydraulic chamber, and the clutch is disengaged.

  In a second aspect of the present invention, in the hydraulic clutch release device, the tube member has a passage portion that forms a throttle for pressure oil by contacting the inner housing, and the piston member is the release member. When pushed out to the bearing side, the abutment surface of the tube member and the inner housing is configured to be separated.

  In a third aspect of the present invention, in the hydraulic clutch release device, the tube member has a predetermined amount of shimiro with respect to an outer diameter surface of the piston member.

  According to a fourth aspect of the present invention, in the hydraulic clutch release device, the outer housing has a locking portion on an inner peripheral surface, and the tube member is locked by the locking portion. It has a stop part.

  According to the present invention (Claim 1), the tube member for restricting the axial movement of the first seal member is provided in the radial gap between the outer housing and the piston, so that the inner housing for housing the first seal member is provided in the outer housing. Since the groove processing is eliminated, the inner diameter portion of the housing is not required to be machined, and the housing can be manufactured at low cost by die casting or resin molding, and the built-in components can be easily assembled.

  According to the present invention (Claim 2), by providing a passage portion with a narrowed oil passage at the end of the tube member, the flow rate is regulated even when the clutch pedal is suddenly returned, and sudden clutch engagement is performed. It is possible to prevent an excessive transmission torque from being transmitted. There is a concern that the passage portion having such a throttle may affect feeling deterioration such as heavy pedaling force if it becomes resistance when the pedal is depressed in normal clutch operation. Since the inner diameter is set with a squeezing force, when the piston member operates to the side where the clutch is disengaged, the tube member also moves so that the throttle is released, and does not become a resistance when the pedal is depressed.

  According to the present invention (Claim 3), if the squeezing of the tube member and the piston member is adjusted (set to a small value), the posture of the diaphragm spring is changed by the friction of the clutch friction plate, and the piston member moves in the direction opposite to the stroke. The movement is not hindered when it is pushed in.

  According to the present invention (Claim 4), by providing the locking portion in the outer housing, the tube member is locked by the locking portion of the outer housing when the piston member is pushed out to the release bearing side. The first seal member is not crushed.

  Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a configuration of a hydraulic clutch release device according to Embodiment 1 of the present invention.

  The hydraulic clutch release device 1 includes an inner housing 11, an outer housing 12, a piston member 13, a first seal member 14, a second seal member 15, a tube member 16, a hydraulic chamber 17, and a release bearing 18. And a spring member 19 and a support member 20.

  The inner housing 11 is an annular (drum-shaped, cylindrical) member, and includes a cylindrical portion 11a and a flange portion 11b. The cylindrical part 11a is a part surrounding the rotation transmission shaft 2 of the transmission. The flange portion 11b is a portion extending in the outer peripheral direction from one end of the cylindrical portion 11a. The inner housing 11 is fixed to a clutch housing (not shown) through which the rotation transmission shaft 2 is inserted. The rotation transmission shaft 2 is an input shaft in a vehicle transmission.

  The outer housing 12 is arranged so as to surround the inner housing 11, and has a shoulder 12a and an oil passage 12b. The shoulder portion 12a is a portion for accommodating the first seal member 14, and is a shoulder-like portion in which the tip end portion on the release bearing 18 side protrudes in the inner circumferential direction. The oil passage 12b is a portion serving as a passage for pressure oil supplied from a clutch master cylinder (not shown) or the like.

  The piston member 13 is a member that is slidable in the axial direction of the rotation transmission shaft 2 by hydraulic pressure between the inner housing 11 and the outer housing 12, and has an attachment portion 13a and a shoulder portion 13b. The attachment portion 13 a is a portion to which the release bearing 18 is attached, and is a portion that is not accommodated in the outer housing 12 and is disposed on the outer periphery of the inner housing 11. The shoulder portion 13b is a portion that accommodates the second seal member 15, and is a shoulder-like portion that protrudes toward the hydraulic chamber 17 side.

  The first seal member 14 is an annular seal member that seals the hydraulic chamber 17, and is accommodated between the outer housing 12 and the piston member 13 and between the tube member 16 and the shoulder 12 a of the outer housing 12. Yes. The first seal member 14 is locked by the shoulder 12 a of the outer housing 12 when the piston member 13 moves in the direction of the release bearing 18, and when the piston member 13 moves in the direction opposite to the release bearing 18. Locked by the tube member 16.

  The second seal member 15 is an annular seal member that seals the hydraulic chamber 17, and moves in the axial direction of the rotation transmission shaft 2 between the inner housing 11 and the piston member 13 and at the shoulder portion 13 b of the piston member 13. (Follow-up) is accommodated.

  The tube member 16 is a member for preventing the first seal member 14 from moving in the axial direction (of the rotation transmission shaft 2) when the piston member 13 moves in the direction opposite to the release bearing 18. It is arranged between the housing 12 and the piston member 13. The tube member 16 has a passage portion 16a through which pressure oil passes in the vicinity of the oil passage 12b.

The hydraulic chamber 17 is an annular hydraulic chamber surrounded by the inner housing 11, the outer housing 12 and the piston member 13. The hydraulic chamber 17 is connected to a clutch master cylinder (not shown) or the like via the oil passage 12b.

  The release bearing 18 is attached to the attachment portion 13 a of the piston member 13. The inner ring 18 a of the release bearing 18 is a non-rotating ring fixed to the piston member 13. One end face of the outer ring 18 b of the release bearing 18 is always joined to a diaphragm spring (not shown) by the spring force of the spring member 19, and the other end face of the outer ring 18 b is separated from the support member 20. Therefore, the outer ring 18b of the release bearing 18 rotates integrally with a diaphragm spring (not shown). A diaphragm spring (not shown) presses a clutch disc (not shown) to a flywheel (not shown) via a pressure plate (not shown).

  The spring member 19 is interposed between the outer housing 12 and the support member 20 in the axial direction of the rotation transmission shaft 2. One end (non-moving end) of the spring member 19 is in contact with the outer housing 12, and the other end (driven end) of the spring member 19 is in contact with the support member 20. The spring member 19 urges the support member 20 toward the diaphragm spring (not shown).

  The support member 20 is disposed on the outer periphery of the drum-shaped portion of the outer housing 12 and is in contact with the tip end portion of the inner ring 18 a of the release bearing 18.

  Next, the operation of the hydraulic clutch release device according to the first embodiment will be described. First, when a clutch pedal (not shown) is depressed, pressure oil is supplied from a clutch master cylinder (not shown) to the hydraulic chamber 17 through the oil passage 12b, and the hydraulic pressure in the hydraulic chamber 17 increases. When the pressure oil is supplied to the hydraulic chamber 17 through the oil passage 12b, it passes through the passage portion 16a of the tube member 16. When the hydraulic pressure in the hydraulic chamber 17 is increased, the piston member 13 moves (slides) toward the diaphragm spring (not shown). The movement of the piston member 13 is transmitted to the central portion of a diaphragm spring (not shown) via a release bearing 18, and the diaphragm spring (not shown) is moved to a clutch disk (not shown) and a flywheel (not shown). It is elastically deformed to release the joint.

  On the other hand, when the depression of a clutch pedal (not shown) is released, the pressure oil supplied to the hydraulic chamber 17 passes through the passage portion 16a of the tube member 16 and is discharged through the oil passage 12b.

  According to the first embodiment, the tube member 16 is provided in the radial gap between the outer housing 12 and the piston member 13, so that the first seal member 14 does not slide on the inner wall surface of the outer housing 12. Further, since the outer housing 12 has a shape (structure) that can be divided in the axial direction, it can be manufactured by die casting, resin molding, etc., and almost no cutting is required, so that a product can be manufactured at low cost. Is possible.

  Next, Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view schematically showing a configuration of a hydraulic clutch release device according to Embodiment 2 of the present invention.

  In the hydraulic clutch release device according to the second embodiment, the configurations of the outer housing and the tube member of the hydraulic clutch release device according to the first embodiment are different, but the other configurations are the same.

  The outer housing 12 is disposed so as to surround the inner housing 11, and includes a shoulder portion 12a, an oil passage 12b, and a locking portion 12c. The shoulder portion 12a is a portion for accommodating the first seal member 14, and is a shoulder-like portion in which the tip end portion on the release bearing 18 side protrudes in the inner circumferential direction. The oil passage 12b is a portion serving as a passage for pressure oil supplied from a clutch master cylinder (not shown). The locking portion 12c is a portion for locking the sliding of the tube member 16, and is a stepped portion or a convex portion provided on the inner peripheral surface.

  The tube member 16 includes a passage portion 16a and a locked portion 16b. The passage portion 16a is a pressure oil passage formed in the vicinity of the contact portion with the inner housing 11, and has a pressure oil throttle, and may be, for example, a groove (see FIG. 2) or a through hole. . The locked portion 16b is a portion locked by the locking portion 12c, and may be a step, for example. The tube member 16 has an appropriate squeeze with the piston member 13 at its inner diameter.

  Next, the operation of the hydraulic clutch release device according to the second embodiment will be described. First, when a clutch pedal (not shown) is depressed, pressure oil is supplied from the oil passage 12b to the hydraulic chamber 17, and when the piston member 13 starts moving in the direction of the release bearing 18, the tube member 16 is moved to the piston member 13 by squeezing. At the same time, it moves in the direction of the release bearing 18, the contact surface between the tube member 16 and the flange portion 11b is separated, and an oil passage is secured. Here, the passage portion 16a does not act as an orifice. Then, the locked portion 16 b of the tube member 16 is locked to the locking portion 12 c of the outer housing 12. Thereafter, the piston member 13 and the tube member 16 are operated while being relatively displaced in the axial direction.

  On the other hand, when the clutch pedal (not shown) is returned, the piston member 13 starts to move in the return direction due to the reaction force of the clutch (diaphragm spring), but the tube member 16 moves together with the piston member 13 by shimoshiro. 13 end abuts on the flange portion 11 b of the inner housing 11, and most of the pressure oil returns to the oil passage 12 b through the passage portion 16 a of the tube member 16.

  According to the second embodiment, by providing the tube member 16 with a passage portion that narrows the oil passage, the flow rate of the pressure oil is regulated even when the clutch pedal is suddenly returned, and excessive transmission is caused by sudden clutch engagement. Torque can be prevented from being transmitted. Further, if the squeeze between the tube member 16 and the piston member 13 is adjusted (set to a small value), the posture of the diaphragm spring (not shown) changes due to the friction of the clutch friction plate (not shown), and the piston member strokes. If it is pushed in the opposite direction, the movement is not hindered. Further, by providing the locking portion 12 c in the outer housing 12, the locked portion 16 b of the tube member 16 comes into contact with the locking portion 12 c of the outer housing 12, and the tube member 16 presses the first seal member 14. There is nothing.

It is sectional drawing which showed typically the structure of the hydraulic clutch release apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which showed typically the structure of the hydraulic clutch release apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic type clutch release apparatus 2 Rotation transmission shaft 11 Inner housing 11a Tubular part 11b Flange part 12 Outer housing 12a Shoulder part 12b Oil passage 12c Locking part 13 Piston member 13a Mounting part 13b Shoulder part 14 First seal member 15 Second Seal member 16 Tube member 16a Passage portion 16b Locked portion 17 Hydraulic chamber 18 Release bearing 18a Inner ring 18b Outer ring 19 Spring member 20 Support member

Claims (4)

An annular inner housing surrounding the rotation transmission shaft;
An outer housing surrounding the inner housing;
An annular piston member accommodated between the inner housing and the outer housing so as to be movable in the axial direction of the rotation transmission shaft;
A release bearing adjacent to the piston member in the axial direction of the rotation transmission shaft and movable in the axial direction of the rotation transmission shaft;
A tube member that is disposed between the outer housing and the piston member and that may abut against the inner housing;
A first seal member disposed between the outer housing and the piston member, and disposed between the outer housing and the tube member;
A second seal member that is disposed between the inner housing and the piston member and that follows the movement of the piston member;
With
A hydraulic chamber is formed between the inner housing and the outer housing by the inner housing, the outer housing, and the piston member,
The hydraulic clutch release device characterized in that the piston member and the release bearing are moved in the axial direction of the rotation transmission shaft by the hydraulic pressure in the hydraulic chamber to disengage the clutch. The tube member has a passage portion that forms a throttle for pressure oil by contacting the inner housing,
2. The hydraulic clutch release device according to claim 1, wherein when the piston member is pushed out toward the release bearing, a contact surface between the tube member and the inner housing is separated. 3.   3. The hydraulic clutch release device according to claim 1, wherein the tube member has a predetermined amount of shimiro with respect to an outer diameter surface of the piston member. 4. The outer housing has a locking portion on the inner peripheral surface,
The hydraulic clutch release device according to any one of claims 1 to 3, wherein the tube member has a locked portion that is locked by the locking portion.

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