JP2010084905A - Hydraulic clutch release device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic clutch release device for elongating the life of a clutch by preventing an increase in the solid height of a return spring. <P>SOLUTION: The hydraulic clutch release device includes: an inside housing 1, an outside housing 2; a cylinder chamber 4 formed between the inside housing 1 and the outside housing 2; annular pistons 6, 7 stored in the cylinder chamber 4 in an axially slidable manner; a release bearing 5 movable along with the slide of the annular pistons 6, 7; and the return spring 9 arranged between the outside housing 2 and the release bearing 5 for biasing the release bearing 5. In an area to be the seat face at the end of the return spring 9 on the side of the outside housing 2, an outer periphery positioning portion 11c and a guide portion 11d are provided which avoids the displacement of the end of the return spring 9 on the side of the outside housing 2 to the outer periphery side and which guides the return spring 9 riding over the top of the outer periphery positioning portion 11c to the inner periphery side, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hydraulic clutch release device that disengages a clutch by hydraulic pressure.

  The hydraulic clutch release device forms an oil chamber between the inner housing and the outer housing by the inner housing, the outer housing, and the annular piston, and moves the annular piston and the release bearing in the axial direction by the oil pressure in the oil chamber. Is turned off. The release bearing is fixed to the annular piston and is in contact with the diaphragm spring of the clutch.

  In order to prevent an increase in loss stroke due to non-contact between the release bearing and the diaphragm spring, and to prevent noise generation from the release bearing due to a change in the friction coefficient, the release bearing must be constantly pressed against the diaphragm spring. Therefore, a return spring (coil spring) that urges the release bearing toward the diaphragm spring is disposed between the outer housing and the release bearing (or the annular piston). The return spring has a very strict requirement for the minimum height (contact height) when the spring contracts due to insufficient space in the clutch housing. As a method for reducing the contact height, a drum-shaped return spring may be used (see Patent Document 1).

US Pat. No. 6,273,231 (FIG. 27)

  Although the release bearing is attached to the annular piston so as to be aligned, the end of the return spring may be in an eccentric state due to the alignment operation of the release bearing. At this time, the effective portion of the return spring (intermediate portion that can be expanded and contracted) rides on the outer peripheral side of the end portion, and the contact height increases. If the close contact height of the return spring is increased, the range in which the release bearing can be stroked becomes narrow, and slipping of the clutch may occur at an early stage, which may shorten the life of the clutch.

  The main subject of this invention is providing the hydraulic clutch release apparatus which can prevent the contact spring height becoming high and can lengthen the lifetime of a clutch.

  In one aspect of the present invention, in a hydraulic clutch release device, an inner housing that surrounds a rotating shaft, an outer housing that surrounds the inner housing, and a cylinder chamber that is configured between the inner housing and the outer housing. And an oil passage formed in the outer housing and communicating with the cylinder chamber, an annular piston slidably accommodated in the axial direction in the cylinder chamber, and movable as the annular piston slides A release spring, and a return spring disposed between the outer housing and the release bearing or the annular piston and biasing the release bearing, and a seat at an end of the return spring on the outer housing side The outer spring of the return spring An outer peripheral positioning portion that prevents an end portion on the ging side from being shifted to the outer peripheral side, and a first guide portion that guides the return spring riding on the top of the outer peripheral positioning portion to the inner peripheral side. To do.

  The hydraulic clutch release device of the present invention includes a cover member that covers an outer periphery of the return spring, and the cover member includes a seat portion that serves as a seating surface of an end portion of the return spring on the outer housing side. The seat portion includes the outer peripheral positioning portion and the first guide portion.

  In the hydraulic clutch release device of the present invention, the outer housing has a seat portion that serves as a seating surface of an end portion of the return spring on the outer housing side, and the outer peripheral positioning portion and the first portion are disposed on the seat portion. It has a guide part.

  In the hydraulic clutch release device according to the present invention, the first guide portion is a tapered surface in which a corner portion on the inner peripheral side of the top portion of the outer peripheral positioning portion is chamfered.

  In the hydraulic clutch release device of the present invention, a detent portion that prevents the return spring from rotating on a portion that becomes a seating surface of the end portion on the outer housing side of the return spring, and a top portion of the detent portion And a second guide portion that guides the return spring riding on the inner periphery side.

  In the hydraulic clutch release device according to the present invention, the second guide portion is a tapered surface in which a corner portion on the inner peripheral side of the top portion of the detent portion is chamfered.

  In the hydraulic clutch release device of the present invention, the return spring is formed in a drum shape in which the diameter of both end portions is larger than the diameter of the intermediate effective portion in a free state when viewed from the side.

  According to the present invention, even when the effective portion rides on the upper surface of the outer peripheral positioning portion or the rotation preventing portion while the return spring is compressed, the effective portion is guided to the inner peripheral side by the first guide portion and the second guide portion. Since the surface can be grounded, the contact height is prevented from increasing, and the life of the clutch can be extended.

  In the hydraulic clutch release device according to the embodiment of the present invention, an inner housing (1 in FIG. 1) surrounding the rotating shaft, and an outer housing (2 in FIG. 1) surrounding the inner housing (1 in FIG. 1). , A cylinder chamber (4 in FIG. 1) configured between the inner housing (1 in FIG. 1) and the outer housing (2 in FIG. 1), and the outer housing (2 in FIG. 1). And an oil passage (2a in FIG. 1) communicating with the cylinder chamber (4 in FIG. 1), and an annular piston (in FIG. 1) accommodated in the cylinder chamber (4 in FIG. 1) so as to be slidable in the axial direction. 6, 7), a release bearing (5 in FIG. 1) that can move as the annular piston (6, 7 in FIG. 1) slides, the outer housing (2 in FIG. 1), and the release bearing ( 1) or the annular piston (6 in FIG. 1). And a return spring (9 in FIG. 1) for biasing the release bearing (5 in FIG. 1), and the outer housing (9 in FIG. 1) of the return spring (9 in FIG. 1). 2) The outer peripheral positioning portion that prevents the end of the return spring (9 in FIG. 1) on the outer housing (2 in FIG. 1) side from shifting to the outer peripheral side at the portion that becomes the seating surface of the end on the 2) side (11c in FIG. 1), and a first guide portion (11d in FIG. 1) for guiding the return spring (9 in FIG. 1) riding on the top of the outer peripheral positioning portion (11c in FIG. 1) to the inner peripheral side. Have.

  A hydraulic clutch release device according to a first embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view schematically showing a configuration of a hydraulic clutch release device according to a first embodiment of the present invention. FIG. 2 is a side view schematically showing the configuration of the free state of the coil spring in the hydraulic clutch release device according to the first embodiment of the present invention. 3A is a plan view schematically showing the configuration of the cover member in the hydraulic clutch release device according to Embodiment 1 of the present invention, and FIG.

  Referring to FIG. 1, in the hydraulic clutch release device, an inner chamber 1, an outer housing 2, and a second annular piston 7 form an oil chamber 4 between the inner housing 1 and the outer housing 2. This is a device that moves the annular pistons 6 and 7 and the release bearing 5 in the axial direction of the rotary shaft by the hydraulic pressure of the clutch to disengage the clutch (not shown). The hydraulic clutch release device includes an inner housing 1, an outer housing 2, a seal 3, an oil chamber 4, a release bearing 5, a first annular piston 6, a second annular piston 7, a disc spring 8, A return spring 9, a seat member 10, a cover member 11, a retaining ring 12, a seal 13, and a stopper member 14 are included.

  The inner housing 1 is an annular (drum-shaped, cylindrical) member, and becomes a part of the cylinder chamber. The inner housing 1 has a cylindrical portion 1a and a flange portion 1b. The cylindrical part 1a is a part surrounding an input shaft (not shown) of a transmission (not shown). The flange portion 1b is a portion extending in the outer peripheral direction from one end of the tubular portion 1a.

  The outer housing 2 is arranged so as to surround the inner housing 1 at a predetermined interval, and becomes a part of the cylinder chamber. The outer housing 2 has an oil port 2a, a mounting flange 2b, and a step portion 2c. The oil port 2 a is a portion serving as an oil passage for supplying pressure oil supplied from a clutch master cylinder (not shown) or the like to the oil chamber 4. The attachment flange 2b is a flange-shaped portion for attachment to a transmission or the like. The step portion 2 c is a recess formed on the surface of the outer housing 2 on the flange portion 1 b side, and is formed in an annular shape on the outer periphery of the oil chamber 4. The step portion 2 c serves as an oil passage for supplying the pressure oil from the oil port 2 a to the oil chamber 4.

  The seal 3 is an annular seal member made of an elastic material and sealing the oil chamber 4. The seal 3 is disposed between the inner housing 1 and the outer housing 2 and is attached to the recess 7 a of the second annular piston 7.

  The oil chamber 4 is an annular cylinder chamber surrounded by the inner housing 1, the outer housing 2, and the second annular piston 7. The oil chamber 4 is connected to a clutch master cylinder (not shown) or the like through an oil passage between the step portion 2c and the flange portion 1b, and an oil port 2a.

  The release bearing 5 is a ball bearing attached to the holding member 5c. The inner ring 5a of the release bearing 5 is rotatably supported by the outer ring 5b via a ball, and is always joined to a diaphragm spring (not shown) at the end on the clutch side (right side in FIG. 1). . Therefore, the inner ring 5a rotates integrally with a diaphragm spring (not shown). A diaphragm spring (not shown) presses a clutch disk (not shown) to a flywheel (not shown) via a pressure plate (not shown). The outer ring 5b of the release bearing 5 is a non-rotating wheel fixed to the first annular piston 6 via a holding member 5c. The holding member 5c of the release bearing 5 is attached by a disc spring 8 at the attachment portion 6a of the first annular piston 6 so that it can be aligned, and the return spring 9 via the seat member 10 on the surface on the return spring 9 side. Has received the urging power of

  The first annular piston 6 is an annular member that is slidable in the axial direction (left-right direction in FIG. 1) by sliding the second annular piston 7 between the inner housing 1 and the outer housing 2. The first annular piston 6 has an attachment portion 6 a for attaching the release bearing 5 to a portion that is not accommodated in the outer housing 2. The first annular piston 6 is in contact with the second annular piston 7 at the end on the oil chamber 4 side so as to be able to contact and separate.

  The second annular piston 7 is a member that is slidable in the axial direction (left-right direction in FIG. 1) by hydraulic pressure between the inner housing 1 and the outer housing 2. The second annular piston has a recess 7a for attaching the seal 3 to the end on the oil chamber 4 side. The second annular piston 7 is in contact with the first annular piston 6 at the end on the clutch side (right side in FIG. 1) so as to be able to contact and separate.

  The disc spring 8 is an annular member having spring elasticity for attaching the holding member 5 c of the release bearing 5 to the attachment portion 6 a of the first annular piston 6. The disc spring 8 supports the release bearing 5 so as to be movable in the radial direction.

  The return spring 9 is interposed between the seat member 10 and the seat portion 11a of the cover member 11 in an axial direction (left-right direction in FIG. 1) of an input shaft (not shown). The return spring 9 biases the release bearing 5 toward the diaphragm spring (not shown) via the seat member 10. In the free state, the return spring 9 is formed in a drum shape in which the diameter of the end portion 9a is large and the diameter of the effective portion 9b that can be expanded and contracted is small, as shown in FIG. The return spring 9 has a drum shape because the effective portion 9b is disposed on the inner peripheral side of the end portion 9a when the spring is contracted, thereby reducing the minimum height (contact height) when the spring is contracted. This is because it can be made smaller.

  The seat member 10 is a member for supporting one end of the return spring 9 and is attached to the holding member 5 c of the release bearing 5.

  The cover member 11 is a cylindrical member that covers the outer periphery of the return spring 9. The cover member 11 is set so as not to interfere with the release bearing 5 even when the annular pistons 6 and 7 slide to the oil chamber 4 side. The cover member 11 is formed with a notch 11 g (a recess may be acceptable) corresponding to the protruding portion of the outer housing 2. The cover member 11 has a seat portion 11a that extends to the inner peripheral side at an end portion on the transmission side (left side in FIG. 1). The seat portion 11 a supports the other end of the return spring 9 and is in contact with the outer housing 2. The seat portion 11a includes an inner circumferential positioning portion 11b, an outer circumferential positioning portion 11c, a guide portion 11d, a rotation stopping portion 11e, and a guide portion 11f on the surface on the return spring 9 side (see FIG. 3).

  The inner peripheral positioning portion 11b is for preventing the effective portion (9b in FIG. 2) from shifting to the inner peripheral side when the return spring 9 is contracted, and the inner peripheral end portion of the seat portion 11a is the return spring. It is a cylindrical part protruding to the 9 side. The outer peripheral positioning portion 11c is for preventing the end portion (9a in FIG. 2) from shifting to the outer peripheral side, and is a cylindrical portion protruding from a predetermined position on the surface of the seat portion 11a on the return spring 9 side. is there. The guide portion 11d is a tapered surface with chamfered corners on the inner peripheral side of the top of the outer peripheral positioning portion 11c, and when the return spring 9 contracts, the effective portion (9b in FIG. 2) rides on the outer peripheral positioning portion 11c. Sometimes it is for guiding to the inner circumference side. The anti-rotation portion 11e is for preventing the return spring 9 from rotating within the cover member 11, and is a portion protruding from a predetermined position on the inner peripheral surface of the outer peripheral positioning portion 11c to the inner peripheral side. The tip of the end portion (9a) of the return spring 9 abuts against the circumferential surface of the rotation stop portion 11e, thereby preventing the return spring 9 from rotating. A space between the rotation stop portion 11e and the inner peripheral positioning portion 11b becomes a space in which the effective portion (9b in FIG. 2) is accommodated when the return spring 9 is contracted. The guide portion 11f is a tapered surface with chamfered corners on the inner peripheral side of the top of the non-rotating portion 11e, and when the return spring 9 contracts, the effective portion (9b in FIG. 2) rides on the non-rotating portion 11e. Sometimes it is for guiding to the inner circumference side.

  The retaining ring 12 is an annular member that restricts the sliding of the annular pistons 6 and 7 to the clutch side (right side in FIG. 1). The retaining ring 12 is attached to a groove formed in the vicinity of the end of the outer peripheral surface of the inner housing 1 on the clutch side (right side in FIG. 1).

  The seal 13 is an annular member made of an elastic material for sealing the joint surface between the flange portion 1 b of the inner housing 1 and the outer housing 2. The seal 13 is disposed on the outer peripheral side of the oil chamber 4 and the oil port 2a.

  The stopper member 14 is an annular member that restricts sliding of the seal 3 toward the transmission side (left side in FIG. 1). When the piston is completely separated for blocking the propagation of the axial vibration caused by the crankshaft (not shown) of the engine (not shown) to the hydraulic system, the stopper member 14 is separated from the step 2c. This is to prevent the oil passage between the flange portions 1b from being damaged. The stopper member 14 is rotatably disposed on the outer periphery of the cylindrical portion 1a of the inner housing 1 in the oil passage between the step portion 2c and the flange portion 1b from a portion near the flange portion 1b of the oil chamber 4. . The stopper member 14 has a groove that communicates with the oil chamber 4 from the oil passage between the stepped portion 2c and the flange portion 1b. The stopper member 14 is caught in an oil passage between the stepped portion 2c and the flange portion 1b and is restricted from moving in the axial direction.

  Next, the operation of the hydraulic clutch release device according to the first embodiment of the present invention will be described with reference to the drawings. 4 and 5 are diagrams schematically illustrating the operation of the return spring in the hydraulic clutch release device according to the first embodiment of the present invention.

  When a clutch pedal (not shown) is depressed, pressure oil is supplied to the oil chamber 4 from a clutch master cylinder (not shown), and the annular pistons 6 and 7 and the release bearing 5 are moved to the clutch side (right side in FIG. 1). The clutch (not shown) is disconnected.

  When the clutch pedal (not shown) is released, the pressure oil in the oil chamber 4 is discharged from the oil port 2a, and the annular pistons 6 and 7 and the release bearing 5 move to the oil chamber 4 side, and the clutch (not shown) Engage.

  Here, after the hydraulic clutch release device is attached to the vehicle, the release bearing 5 moves to the oil chamber 4 side due to wear of the clutch after a certain distance. For this reason, the return spring 9 bends. The release bearing 5 is aligned in order to absorb radial variations between the diaphragm spring and the engine and the transmission, and is attached to the first annular piston, so that it is displaced in the radial direction. Therefore, as the clutch wears, the return spring 9 buckles, and the effective portion (9b in FIG. 2) of the return spring 9 may ride on the outer peripheral positioning portion 11c and the rotation stop portion (11e in FIG. 3) (FIG. 3). 4 upper row, see FIG. 5 upper row). Even if the effective portion (9b in FIG. 2) of the return spring 9 rides on the outer peripheral positioning portion 11c and the detent portion (11e in FIG. 3), the guide portion 11d and the detent portion (11e in FIG. 3) on the outer peripheral positioning portion 11c. ) Guide portion (11f in FIG. 3) guides the effective portion (9b in FIG. 2) of the return spring 9 to the inner peripheral side, and finally the effective portion (9b in FIG. 2) of the return spring 9 is the end portion. It is accommodated in the inner periphery of (9a in FIG. 2), and it is possible to prevent the contact height from increasing (see the lower stage in FIG. 4 and the lower stage in FIG. 5).

  According to the first embodiment, when the return spring 9 is compressed, the effective portion 9b is guided to the inner peripheral side by the guide portions 11d and 11f even if the effective portion 9b rides on the upper surface of the outer peripheral positioning portion 11c and the detent portion 11e. Since the sheet portion 11a can be grounded, it is possible to prevent the contact height from being increased and to extend the life of the clutch.

  In the first embodiment, the seat portion 11a, the outer periphery positioning portion 11c, the guide portion 11d, the anti-rotation portion 11e, and the guide portion 11f are the constituent parts of the cover member 11, but may be the constituent parts of the outer housing 2. .

It is sectional drawing which showed typically the structure of the hydraulic clutch release apparatus which concerns on Example 1 of this invention. It is the side view which showed typically the structure of the free state of the coil spring in the hydraulic clutch release apparatus which concerns on Example 1 of this invention. It is the (A) top view and the sectional view between XX 'which showed typically the composition of the cover member in the hydraulic clutch release device concerning Example 1 of the present invention. It is the 1st figure showing typically operation of a return spring in a hydraulic clutch release device concerning Example 1 of the present invention. It is the 2nd figure showing typically operation of a return spring in a hydraulic clutch release device concerning Example 1 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner housing 1a Tubular part 1b Flange part 2 Outer housing 2a Oil port 2b Mounting flange 2c Step part 3 Seal 4 Oil chamber (cylinder chamber)
5 Release bearing 5a Inner ring 5b Outer ring 5c Holding member 6 First annular piston 6a Mounting portion 7 Second annular piston 7a Recessed portion 8 Disc spring 9 Return spring 9a End portion 9b Effective portion 10 Seat member 11 Cover member 11a Seat portion 11b Inner circumference positioning Part 11c Outer peripheral positioning part 11d Guide part (first guide part)
11e Non-rotating part 11f Guide part (second guide part)
11g Notch 12 Retaining ring 13 Seal 14 Stopper member

Claims (7)

An inner housing that surrounds the rotating shaft;
An outer housing surrounding the inner housing;
A cylinder chamber configured between the inner housing and the outer housing;
An oil passage formed in the outer housing and communicating with the cylinder chamber;
An annular piston accommodated slidably in the axial direction in the cylinder chamber;
A release bearing that is movable as the annular piston slides;
A return spring disposed between the outer housing and the release bearing or the annular piston and biasing the release bearing;
With
In the part that becomes the seating surface of the end of the return spring on the outer housing side
An outer peripheral positioning portion for preventing the end of the return spring on the outer housing side from shifting to the outer peripheral side;
A first guide portion for guiding the return spring riding on the top of the outer peripheral positioning portion to the inner peripheral side;
A hydraulic clutch release device comprising: A cover member covering the outer periphery of the return spring;
The cover member includes a seat portion that serves as a seating surface of an end portion of the return spring on the outer housing side, and the outer peripheral positioning portion and the first guide portion are included in the seat portion. 1. The hydraulic clutch release device according to 1.   The outer housing includes a seat portion that serves as a seating surface of an end portion of the return spring on the outer housing side, and the outer peripheral positioning portion and the first guide portion are included in the seat portion. 1. The hydraulic clutch release device according to 1.   4. The hydraulic clutch release device according to claim 3, wherein the first guide portion is a tapered surface having a chamfered corner portion on an inner peripheral side of a top portion of the outer peripheral positioning portion. In the part that becomes the seating surface of the end of the return spring on the outer housing side
A detent that prevents the return spring from rotating;
A second guide portion for guiding the return spring riding on the top of the detent portion to the inner peripheral side;
5. The hydraulic clutch release device according to claim 1, wherein the hydraulic clutch release device is provided.   6. The hydraulic clutch release device according to claim 5, wherein the second guide portion is a tapered surface having a chamfered corner portion on the inner peripheral side of the top portion of the detent portion.   The return spring is formed in a drum shape in which the diameter of both end portions is larger than the diameter of the intermediate effective portion in a free state when viewed from the side. The hydraulic clutch release device described in 1.

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