JP5262534B2 - Hydraulic clutch release device - Google Patents

Description

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

  In the hydraulic clutch release device, an oil chamber is formed between the inner housing and the outer housing by the inner housing, the outer housing, and the annular piston, and the annular piston and the release bearing are moved in the axial direction of the rotation transmission shaft by the oil pressure in the oil chamber. Move to disengage the clutch. A seal is attached to the tip of the annular piston that slides in the oil chamber. In the hydraulic clutch release device, there is a seal and an annular piston to block the propagation of axial vibrations caused by the crankshaft of the engine to the hydraulic system and to prevent separation of the seal and the annular piston during air bleeding operation. Although they are connected with an axial clearance, the set amount of the axial clearance depends on the engine, and it is necessary to increase the clearance to block propagation as the engine is more vibrated. Therefore, it is necessary to select or completely separate the gap amount according to the engine vibration. The following is disclosed as a prior art having a gap between the seal and the annular piston in the axial direction.

  For example, Patent Document 1 discloses a seal that is slidably connected to an annular piston by a protrusion formed on the seal or a reinforcement thereof with a gap in the axial direction and the radial direction. In Patent Document 2, the seal is fixed to a seal carrier having an annular shape on the side surface of the pressure chamber, and the seal carrier is slidably connected to the annular piston with a gap in the axial direction and the radial direction. Is disclosed. Further, Patent Document 3 discloses a seal that is slidably connected to an annular piston by a protrusion formed on the seal with an axial gap.

  In each of the hydraulic clutch release devices described in Patent Literatures 1-3, there is a gap serving as an oil passage between the flange portion formed in the inner housing and the outer housing in the axial direction.

German patent No. 19681324 US Pat. No. 6,273,231 French Patent Application Publication No. 2745617

  However, if the annular piston slides to the vicinity of the oil passage between the flange portion of the inner housing and the outer housing, the seal may reach the oil passage between the flange portion of the inner housing and the outer housing. There is a risk that the sealing force of the seal may be impaired by hitting the corners between the inner peripheral surface and the axial surface of the outer housing.

  A main object of the present invention is to provide a hydraulic clutch release device that can prevent a seal from being damaged by an oil passage.

In one aspect of the present invention, in a hydraulic clutch release device, and an inner housing surrounding the rotary shaft, an outer housing surrounding the inner housing, the cylinder chamber formed in between said outer housing and said inner 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 bearing, a seal attached to the pressure receiving portion of the annular piston, and a stopper member that is disposed in the cylinder chamber and restricts sliding of the seal so that the seal does not reach the oil passage , The inner housing has a flange portion in which one end of a cylindrical portion extends to the outer peripheral side, and the outer housing The flange has a step portion for joining the oil passage and the cylinder chamber as a flow path at the joint surface with the flange portion, and the stopper member is an outer periphery of the cylindrical portion. And a plurality of claw portions extending in a gap between the flange portion and the step portion on the outer peripheral surface of the ring portion .

In the hydraulic clutch release device of the present invention, the stopper member is disposed so as to be relatively rotatable and axially movable with respect to the inner housing and the outer housing, and radially outward on the outer peripheral surface of the ring portion. Has a plurality of protrusions protruding toward
Each of the convex portions has a guide surface with a chamfered corner on the tip side on one side surface in the circumferential direction, and the guide surface corresponds to the flow of pressure oil in the oil passage between the adjacent convex portions. The stopper member is preferably configured to rotate.

  In the hydraulic clutch release device of the present invention, the guide surface is a tapered surface.

  In the hydraulic clutch release device according to the present invention, it is preferable that the guide surface has a larger area than a surface of the convex portion opposite to the guide surface.

  In the hydraulic clutch release device of the present invention, it is preferable that the guide surface opposes the guide surface of the convex portion adjacent in the circumferential direction.

  In the hydraulic clutch release device of the present invention, it is preferable that the convex portion has the claw portion at an outer peripheral tip portion.

  In the hydraulic clutch release device according to the present invention, it is preferable that an axial thickness of the ring portion is configured to be thicker than a gap between the flange portion and the step portion.

  In the hydraulic clutch release device according to the present invention, it is preferable that the annular piston includes a first annular piston to which the release bearing is attached and a second annular piston to which the seal is attached.

According to the present invention (Claim 1-8 ), since the stopper member regulates the sliding of the seal, it is possible to prevent the seal from reaching the oil passage and to prevent the seal from being damaged. Will not be damaged. The stopper member can be placed without positioning in the oil passage (oil passage between the stepped portion and the flange portion) and the cylinder chamber that are inherent to the hydraulic clutch release device, so the design of the inner and outer housings has changed It is possible to assemble arbitrarily without doing.

Further, according to the present invention ( 2-8 ), since the guide surface is provided on one surface in the circumferential direction of the convex portion of the stopper member, even if the convex portion hinders the flow of pressure oil, The stopper member rotates to allow pressure oil to flow without resistance, and does not impede the flow of pressure oil even at low temperatures and does not deteriorate the return of the pedal.

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). In addition, an oil passage (oil passage between the stepped portion 2c and the flange portion 1b in FIG. 1) communicating with the cylinder chamber (4 in FIG. 1) and an axial slide in the cylinder chamber (4 in FIG. 1). An annular piston (6, 7 in FIG. 1) that can be accommodated, a release bearing (5 in FIG. 1) that can move as the annular piston (6, 7 in FIG. 1) slides, and the annular piston (6 in FIG. 1) a seal (3 in FIG. And the seal (3 in FIG. 1) and the seal (3 in FIG. 1) so as not to reach the oil passage (oil passage between the step portion 2c and the flange portion 1b). (3 in FIG. 1) and a stopper member (14 in FIG. 1) for restricting sliding, and the inner housing (1 in FIG. 1) has one end of a cylindrical portion (1a in FIG. 1) extending to the outer peripheral side. The outer housing (2 in FIG. 1) is joined to the flange (1b in FIG. 1) and joined to the flange (1b in FIG. 1). It has a step portion (2c in FIG. 1) for connecting the oil passage (2a in FIG. 1) and the cylinder chamber (4 in FIG. 1) as a flow path on the surface, and the stopper member (14 in FIG. 1). ) Has a ring part (14a in FIG. 1) arranged on the outer periphery of the cylindrical part (1b in FIG. 1), A plurality of claw portions (14e in FIG. 1) extending in a gap between the flange portion (1b in FIG. 1) and the step portion (2c in FIG. 1) on the outer peripheral surface of the ring portion (14a in FIG. 1). 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 (A) bottom view and (B) XX ′ sectional view schematically showing the configuration of the stopper member in the hydraulic clutch release device according to the first embodiment of the present invention.

  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 rotation transmission 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, The coil spring 9, the sheet member 10, the cover member 11, the retaining ring 12, the seal 13, and the 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. A claw portion 14e of the stopper member 14 is disposed in a space between the step portion 2c and the flange portion 1b via a predetermined clearance.

  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 as to be centered, and the coil spring 9 via the seat member 10 on the surface on the coil 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) of an input shaft (not shown) between the inner housing 1 and the outer housing 2 by hydraulic pressure. The second annular piston 7 has a recess 7a for mounting the seal 3 on the end portion 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 coil spring 9 is interposed between the seat member 10 and the seat portion 11 a of the cover member 11 in the axial direction (left-right direction in FIG. 1) of an input shaft (not shown). The coil spring 9 biases the release bearing 5 toward the diaphragm spring (not shown) via the seat member 10.

  The sheet member 10 is a member for supporting one end of the coil 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 coil 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 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 coil spring 9 and is in contact with the outer housing 2.

  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 includes a ring portion 14a, a groove portion 14b, a convex portion 14c, a guide surface 14d, and a claw portion 14e (see FIG. 2).

  The ring portion 14 a is a ring-shaped portion of the stopper member 14 disposed in a portion near the flange portion 1 b of the oil chamber 4. The axial length of the ring portion 14a is longer than the gap between the step portion 2c and the flange portion 1b, and is set so that the seal 3 does not reach the corner of the step portion 2c. The inner peripheral surface of the ring portion 14a is disposed on the outer periphery of the cylindrical portion 1a of the inner housing 1 through a gap serving as an oil passage. A clearance is provided between the ring portion 14a and the flange portion 1b. The ring portion 14a has a plurality of convex portions 14c extending to the outer peripheral side on the outer peripheral surface. The outer peripheral tip of the convex portion 14c is disposed on the inner periphery of the outer housing 2 via a clearance. The ring portion 14a has a plurality of groove portions 14b on the surface on the flange portion 1b side. The groove portion 14b is formed in the radial direction between the adjacent convex portions 14c. The space between the adjacent convex portions 14c and the groove portion 14b form an oil passage.

  On one surface in the circumferential direction of the convex portion 14c, there is a guide surface 14d whose corners on the tip side are chamfered. The guide surface 14d is a tapered surface. The surface of the convex portion 14c opposite to the guide surface 14d is a radial surface and has a smaller area than the guide surface 14d. In other words, when the convex portion 14c and the oil port 2a coincide with each other in the radial direction (vertical direction in FIG. 3) of the stopper member 14 in FIG. 3, the surface opposite to the guide surface 14d is substantially parallel to the radial direction. It is said that. 14 d of guide surfaces oppose the guide surface 14d of the convex part 14c adjacent in the circumferential direction. An extension line of the opposing guide surface 14d (tapered surface) toward the outside of the ring portion 14a is not in an intersecting relationship. The guide surface 14d is for preventing the flow of the pressure oil by rotating the stopper member 14 when the position of the convex portion 14c hinders the flow of the pressure oil. 14 d of guide surfaces rotate the stopper member 14 according to the flow of the pressure oil of the oil path between the adjacent convex parts 14c, and the oil path between the adjacent convex parts 14c is made into the oil port of the outer side housing 2. Guide to align with 2a (see FIG. 3).

  A claw portion 14e that protrudes into the oil passage between the step portion 2c and the flange portion 1b is provided at the outer peripheral tip of the convex portion 14c. The claw part 14e restricts the movement of the stopper member 14 in the axial direction by being caught between the step part 2c and the flange part 1b. The nail | claw part 14e is distribute | arranged through the clearance gap between the level | step-difference part 2c and the flange part 1b.

  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. FIG. 3 is a view schematically showing the operation of the stopper member 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, when the flow of pressure oil is obstructed by the stopper member 14 as shown in the upper part of FIG. 3, the pressure oil hits the guide surface 14 d of the convex portion 14 c of the stopper member 14, and a rotational force acts on the stopper member 14. That is, since the guide surface 14d is chamfered at the tip end, the force acting on the guide surface 14d is greater than the force acting on the opposite surface of the convex portion 14c to the guide surface 14d. It is pushed from the guide surface 14d side and rotates. Due to this rotational force, the stopper member 14 rotates until the force is balanced (where the pressurized oil flows without resistance), and the oil path between the adjacent guide surfaces 14d is aligned with the oil port 2a as shown in the lower part of FIG. The

  According to the first embodiment, the stopper member 14 restricts the sliding of the seal 3 to the transmission side (left side in FIG. 1), so that the seal 3 does not reach the corner of the stepped portion 2c, and the seal 3 is damaged. Therefore, the sealing force of the seal is not impaired. In particular, when the annular piston is divided into the first annular piston 6 and the second annular piston 7, the seal 3 reaches the oil passage (the oil passage between the step portion 2c and the flange portion 1b). Therefore, by disposing the stopper member 14, the seal 3 does not reach the corner portion of the step portion 2c.

  In addition, since the guide surface 14d is provided on one circumferential surface of the convex portion 14c of the stopper member 14, even if the convex portion 14c hinders the flow of pressure oil, the stopper member 14 is rotated by the flow of pressure oil, Pressure oil can flow without resistance, and even at low temperatures, the flow of pressure oil is not hindered and pedal return does not deteriorate. The stopper member 14 is formed with radial convex portions 14c on the circumference so as to be disposed in the housings 1 and 2. However, depending on the position of the convex portion 14c, the viscosity of the fluid increases at low temperatures, and the convex portion 14c. Since the resistance of the pedal and the poor return of the pedal occurs, the guide surface 14d is formed on one surface in the circumferential direction of the convex portion 14c, so that even if the convex portion 14c hinders the flow of pressure oil, The stopper member 14 is rotated by the flow, and the pressure oil can flow without resistance.

  Further, since the stopper member 14 can be disposed without determining the position in the oil passage (oil passage between the stepped portion 2c and the flange portion 1b) and the oil chamber 4 inherent in the hydraulic clutch release device, the inner housing The first housing 1 and the outer housing 2 can be arbitrarily assembled without changing the design.

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 sectional view between (A) bottom view and (B) XX 'which showed typically the composition of the stopper member in the hydraulic clutch release device concerning Example 1 of the present invention. It is the figure which showed typically operation | movement of the stopper member in the hydraulic clutch release apparatus which concerns on Example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner housing 1a Cylindrical 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 part 7 Second annular piston 7a Recessed part 8 Disc spring 9 Coil spring 10 Sheet member 11 Cover member 11a Seat part 12 Retaining ring 13 Seal 14 Stopper member 14a Ring 14b Groove 14c Convex 14d Guide surface 14e Claw

Claims (8)

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 seal attached to the pressure receiving portion of the annular piston;
A stopper member that is arranged in the cylinder chamber and restricts sliding of the seal so that the seal does not reach the oil passage;
Equipped with a,
The inner housing has a flange portion in which one end of the cylindrical portion extends to the outer peripheral side,
The outer housing is joined to the flange portion, and has a step portion for connecting the oil passage and the cylinder chamber as a flow passage at the joint surface with the flange portion,
The stopper member has a ring portion disposed on the outer periphery of the cylindrical portion, and has a plurality of claw portions extending in a gap between the flange portion and the step portion on the outer peripheral surface of the ring portion. A hydraulic clutch release device. The stopper member is disposed so as to be relatively rotatable and axially movable with respect to the inner housing and the outer housing, and has a plurality of convex portions projecting radially outward on the outer peripheral surface of the ring portion. ,
Each of the convex portions has a guide surface in which a corner portion on the tip side is chamfered on one surface in the circumferential direction,
The guide surface, the hydraulic clutch release device according to claim 1, characterized in that it is configured to rotate the stopper member according to the pressurized oil flow in the oil passage between adjacent pairs of the projections . The hydraulic clutch release device according to claim 2 , wherein the guide surface is a tapered surface. The hydraulic clutch release device according to claim 2 or 3, wherein the guide surface has a larger area than the surface of the convex portion opposite to the guide surface. 5. The hydraulic clutch release device according to claim 2 , wherein the guide surface opposes the guide surface of the convex portion adjacent in the circumferential direction. 6. The hydraulic clutch release device according to any one of claims 1 to 5 , wherein the convex portion has the claw portion at an outer peripheral tip portion. The hydraulic clutch release according to any one of claims 1 to 6 , wherein a thickness of the ring portion in an axial direction is configured to be thicker than a gap between the flange portion and the stepped portion. apparatus. The hydraulic pressure according to any one of claims 1 to 7 , wherein the annular piston includes a first annular piston to which the release bearing is attached and a second annular piston to which the seal is attached. Type clutch release device.

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