JP2021110355A - Clutch piston mechanism - Google Patents

Abstract

To provide a clutch piston mechanism capable of holding an energizing member without causing a great increase in costs.SOLUTION: A clutch piston mechanism 1 includes an annular piston member 3, an annular canceller member 5, a return spring 7, a plate side holding portion 9A, and a piston side holding portion 9B. The return spring 7 energizes the piston member 3 in a direction approaching a bottom surface 113 of a storage portion 11. The plate side holding portion 9A holds an end portion on the canceller member 5 side of the return spring 7, and the piston side holding portion 9B holds an end portion on the piston member 3 side of the return spring 7. The piston member 3 has an inside seal portion 36 contacted with the inside surface 111 of the storage portion 11, and an outside seal portion 37 contacted with an outside surface 112 of the storage portion 11. The plate side holding portion 9A or the piston side holding portion 9B are made from an elastic material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a clutch piston mechanism for operating a clutch, and more particularly to a clutch piston mechanism that can be suitably used for an automatic transmission (including a continuously variable transmission).

As an example of this type of clutch piston mechanism, the piston for an automatic transmission described in Patent Document 1 is known. The piston for an automatic transmission described in Patent Document 1 includes a piston member that reciprocates in the housing in the axial direction, and a cancel plate that is arranged so as to face each other in the axial direction via the piston member and a spring. There is. The spring is provided between the piston member and the cancel plate, and urges the piston member in a direction away from the cancel plate. Further, from the viewpoint of appropriately transmitting the urging force from the spring to the piston member, it may be required to hold the spring for urging the piston member at an appropriate position. In this regard, Patent Document 2 discloses that both ends of the spring are held by a metal press-molded product.

Japanese Unexamined Patent Publication No. 2006-112443 Japanese Unexamined Patent Publication No. 2011-2054

Here, in the clutch piston mechanism described in Patent Document 1, it is conceivable that each end of the spring is simply held by the metal press-molded product described in Patent Document 2. However, in this case, since it causes an increase in cost, it may be necessary to devise it.

Therefore, an object of the present invention is to provide a clutch piston mechanism capable of holding an urging member that urges a piston member without causing a significant increase in cost.

According to one aspect of the present invention, there is provided a clutch piston mechanism that is housed in a ring groove-shaped housing. This clutch piston mechanism includes an annular piston member, an annular plate member, an urging member, a plate-side holding portion, and a piston-side holding portion. The piston member moves in the first direction by the oil pressure in the hydraulic chamber and presses the clutch plate. The plate member is arranged on the first direction side of the piston member and its movement in the first direction is restricted. The urging member is provided between the piston member and the plate member, and urges the piston member in a second direction opposite to the first direction. The plate-side holding portion is provided on the plate member and holds the end portion of the urging member on the plate member side. The piston-side holding portion is provided on the piston member and holds the end portion of the urging member on the piston member side. The hydraulic chamber is a space on the bottom surface side of the accommodating portion with respect to the piston member, and the piston member has an inner sealing portion that contacts the inner side surface of the accommodating portion and an outer sealing portion that contacts the outer side surface of the accommodating portion. The plate-side holding portion or the piston-side holding portion is made of an elastic material.

According to one aspect of the present invention, it is possible to provide a clutch piston mechanism capable of holding an urging member without causing a significant increase in cost.

It is the schematic sectional drawing of the clutch piston mechanism in one Embodiment of this invention. It is a figure for demonstrating the operation of the clutch piston mechanism. It is a partial plan view of the canceller member of the clutch piston mechanism. It is an enlarged sectional view of the main part including the piston side holding part of the clutch piston mechanism. It is schematic cross-sectional view for demonstrating the modification of the plate side holding part of the clutch piston mechanism. It is schematic cross-sectional view for demonstrating another modification of the plate side holding part. It is a partial plan view of the canceller member of the clutch piston mechanism shown in FIG.

[Outline configuration of clutch piston mechanism]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view for explaining the configuration of the clutch piston mechanism 1 according to the embodiment of the present invention. The clutch piston mechanism 1 is formed in an annular shape as a whole, and FIG. 1 shows a schematic cross-sectional view of one side portion of the clutch piston mechanism 1 in the radial direction. Then, FIG. 1 shows an example of the usage state of the clutch piston mechanism 1 (an example at the time of fastening).

The clutch piston mechanism 1 shown in FIG. 1 is mainly used for an automatic transmission for a vehicle, and is accommodated together with a multi-plate clutch C in an accommodating portion 11 of a housing 10 so as to engage and release the multi-plate clutch C. Has been done. The accommodating portion 11 is formed in a ring groove shape (centered on the axis X) surrounding the axis X of the housing 10. In the present specification, the side close to the axis X is referred to as "inside", the direction approaching the axis X is referred to as "inside", the side far from the axis X is referred to as "outside", and the direction away from the axis X is referred to as "outside". ..

The accommodating portion 11 is formed as a space partitioned by an inner side surface 111, an outer side surface 112, and a bottom surface 113 connecting the ends of the inner side surface 111 and the outer side surface 112. The inner side surface 111 and the outer side surface 112 are planes parallel to the axis X, and the bottom surface 113 is a plane perpendicular to the axis X. Further, the outer side surface 112 is formed as a stepped surface having a first outer side surface 112a located closer to the bottom surface 113 and a second outer side surface 112b farther from the bottom surface 113 than the first outer side surface 112a. There is. The inner side surface 111 and the outer side surface 112 need not be strictly parallel as long as they are substantially parallel to the axis X, and the bottom surface 113 may be substantially perpendicular to the axis X and need not be strictly perpendicular to the axis X. Further, the multi-plate clutch C is arranged in the region corresponding to the second outer side surface 112b in the accommodating portion 11.

The clutch piston mechanism 1 includes a piston member 3, a canceller member 5, a return spring 7, a plate-side holding portion 9A, and a piston-side holding portion 9B.

The piston member 3 is formed in an annular shape as a whole. The center line of the piston member 3 coincides with the axis X of the housing 10. The piston member 3 can move (reciprocate) in the housing portion 11 in the axis X direction (extension direction of the axis X) of the housing 10. It should be noted that the center line of the piston member 3 only needs to substantially coincide with the axis X, and does not have to exactly coincide with the axis X.

In the present embodiment, the piston member 3 includes a first annular plate portion 31, an inner cylindrical portion 32, an outer cylindrical portion 33, a first inward extending portion 34, and a first outer extending portion 35. Has. These (31-35) are made of a metal material and are integrally formed, and these (31-35) constitute a piston plate of the piston member 3.

The first annular plate portion 31 faces the bottom surface 113 of the accommodating portion 11. The inner cylindrical portion 32 extends from the inner peripheral side (inner peripheral edge in the present embodiment) of the first annular plate portion 31 in a direction away from the bottom surface 113 of the accommodating portion 11. The outer cylindrical portion 33 extends from the outer peripheral side (outer peripheral edge in the present embodiment) of the first annular plate portion 31 in a direction away from the bottom surface 113 of the accommodating portion 11. A gap is provided between the outer cylindrical portion 33 and the first outer side surface 112a of the accommodating portion 11. The first inward extending portion 34 extends inward in a flange shape from the tip end portion (lower end portion in FIG. 1) of the inner cylindrical portion 32. A gap is also provided between the end of the first inward extending portion 34 and the inner side surface 111 of the accommodating portion 11. The first outer extending portion 35 extends in a flange shape from the tip end portion (lower end portion in FIG. 1) of the outer cylindrical portion 33 toward the outside (specifically, the second outer side surface 112b of the accommodating portion 11). Exists. The outer cylindrical portion 33 and the first outer extending portion 35 are located above the multi-plate clutch C. The piston member 3 (specifically, the piston plate) can be formed by, for example, pressing a rolled steel sheet. In the present embodiment, the first annular plate portion 31 corresponds to the "annular plate portion" according to the present invention, and the inner cylindrical portion 32 corresponds to the "cylindrical portion" according to the present invention.

A convex portion 31a is formed on the surface of the first annular plate portion 31 of the piston member 3 on the bottom surface 113 side of the accommodating portion 11 so as to project annularly toward the bottom surface 113. The convex portion 31a is not limited to the annular shape, and may be composed of a plurality of protrusions protruding at intervals in the circumferential direction.

Further, the piston member 3 has an inner seal portion 36 that seals a gap between its own inner peripheral side portion and the inner side surface 111 of the accommodating portion 11, and its own outer peripheral side portion and the outer side surface 112 of the accommodating portion 11. It has an outer seal portion 37 that seals a gap between the two. That is, the piston plate (31-35) of the piston member 3 constitutes a so-called "bonded piston seal (BPS)" together with the inner seal portion 36 and the outer seal portion 37. Specifically, the inner seal portion 36 seals the gap between the end portion of the first inward extending portion 34 and the inner side surface 111 of the accommodating portion 11, and the outer seal portion 37 is the outer cylindrical portion. The gap between 33 and the first outer side surface 112a of the accommodating portion 11 is sealed.

The inner seal portion 36 and the outer seal portion 37 are made of synthetic rubber such as nitrile rubber (NBR), acrylic rubber (ACM), silicone rubber (VMQ), and fluororubber (FKM), and are formed as a so-called lip seal. There is. The tip portion (lip tip portion) of the inner seal portion 36 is in contact with the inner side surface 111 of the accommodating portion 11, and slides along the outer side surface 112 of the accommodating portion 11 as the piston member 3 moves. The tip end portion (lip tip portion) of the outer seal portion 37 is in contact with the outer side surface 112 of the accommodating portion 11, and slides along the outer side surface 112 of the accommodating portion 11 as the piston member 3 moves. Therefore, the inner seal portion 36 is in constant contact with the inner side surface 111 of the accommodating portion 11, and the outer seal portion 37 is in constant contact with the outer side surface 112 of the accommodating portion 11, thereby causing the bottom surface 113 of the accommodating portion 11. A sealed hydraulic chamber 20 is formed between the piston member 3 and the piston member 3. In other words, the hydraulic chamber 20 is a space on the bottom surface 113 side of the piston member 3 in the accommodating portion 11.

One end of a hydraulic oil passage 21 for supplying hydraulic oil to the hydraulic chamber 20 is opened at a portion of the inner side surface 111 of the accommodating portion 11 on the bottom surface 113 side. The piston member 3 moves in a direction away from the bottom surface 113 of the accommodating portion 11 (direction of arrow A in FIG. 1) due to the hydraulic pressure of the hydraulic oil supplied to the hydraulic chamber 20, and the first outer extending portion 35 is a multi-plate clutch. The multi-plate clutch C is engaged by pressing the clutch plate C1 on the drive side of C. Therefore, in the present embodiment, the direction of arrow A (the direction away from the bottom surface 113 of the accommodating portion 11) corresponds to the "first direction" according to the present invention. In other words, the first outward extending portion 35 of the piston member 3 is a pressing portion that presses the clutch plate C1, and the clutch plate C1 is a pressed portion that is pressed by the pressing portion of the piston member 3.

The canceller member 5 is arranged on the side opposite to the bottom surface 113 of the accommodating portion 11 with respect to the piston member 3 (that is, the side of the piston member 3 in the direction of the arrow A). Specifically, the canceller member 5 is arranged at a distance from the piston member 3 in the direction away from the bottom surface 113 of the accommodating portion 11. The canceller member 5 is formed in an annular shape as a whole. The center line of the canceller member 5 coincides with the axis X of the housing 10 (it does not have to be exactly the same as long as it is substantially the same). In the present embodiment, the canceller member 5 corresponds to the "plate member" according to the present invention.

In the present embodiment, the canceller member 5 has a second annular plate portion 51, an intermediate cylindrical portion 52, and a second outer extending portion 53. The second annular plate portion 51, the intermediate cylindrical portion 52, and the second outer extending portion 53 are made of a metal material and are integrally formed. Then, these (51-53) constitute a cancel plate of the canceller member 5.

The second annular plate portion 51 is located on the arrow A direction side of the first annular plate portion 31, the inner cylindrical portion 32, and the first inward extending portion 34 of the piston member 3. Specifically, the second annular plate portion 51 faces the first annular plate portion 31 and the first inward extending portion 34 of the piston member 3. The intermediate cylindrical portion 52 extends from the outer peripheral edge of the second annular plate portion 51 toward the first annular plate portion 31 of the piston member 3. The intermediate cylindrical portion 52 is located between the inner cylindrical portion 32 and the outer cylindrical portion 33 of the piston member 3 in the radial direction. The second outer extending portion 53 has a flange shape from the tip end portion (upper end portion in FIG. 1) of the intermediate cylindrical portion 52 toward the outside, more specifically, toward the inner surface of the outer cylindrical portion 33 of the piston member 3. It extends to. A gap is provided between the inner peripheral edge of the second annular plate portion 51 and the inner side surface 111 of the accommodating portion 11. A gap is also provided between the end of the second outer extending portion 53 and the outer cylindrical portion 33 of the piston member 3. The canceller member 5 (specifically, the cancel plate) can be formed by, for example, pressing a rolled steel sheet.

A plurality of convex portions 51a are formed on the inner peripheral edge side of the surface of the second annular plate portion 51 opposite to the bottom surface 113 of the accommodating portion 11 at intervals in the circumferential direction.

Further, the canceller member 5 has a seal portion 54 that seals a gap between a portion on the outer peripheral side of the canceller member 5 and the piston member 3. That is, the cancel plate (51-53) of the canceller member 5 constitutes a so-called "bonded canceller seal (BCS)" together with the seal portion 54. Specifically, the sealing portion 54 seals the gap between the end portion of the second outer extending portion 53 and the inner surface of the outer cylindrical portion 33 of the piston member 3.

The seal portion 54 is made of synthetic rubber and is formed as a so-called lip seal, like the inner seal portion 36 and the outer seal portion 37 of the piston member 3, for example. The tip (lip tip) of the seal portion 54 is in contact with the outer cylindrical portion 33 of the piston member 3 and slides along the inner surface of the outer cylindrical portion 33 of the piston member 3.

Further, the canceller member 5 is restricted from moving in the arrow A direction by the stopper ring 55. In the present embodiment, the stopper ring 55 is in contact with the portion inside the convex portion 51a on the surface opposite to the bottom surface 113 of the accommodating portion 11 of the second annular plate portion 51 of the canceller member 5. It is fixed to the inner side surface 111 of 11. The stopper ring 55 regulates the movement of the canceller member 5 in the arrow A direction by abutting the surface of its own accommodating portion 11 on the bottom surface 113 side with the portion inside the convex portion 51a of the second annular plate portion 51. The outer peripheral surface of the canceller member 5 is in contact with the side surface of the convex portion 51a of the second annular plate portion 51, thereby restricting the movement of the canceller member 5 in the radial direction. Although not particularly limited, in the present embodiment, a seal washer formed as a composite composed of a metal material and a rubber material is used as the stopper ring 55.

A canceller hydraulic chamber 22 is formed between the piston member 3 and the canceller member 5. In other words, the canceller member 5 cooperates with the piston member 3 to form the canceller hydraulic chamber 22. When the housing 10 or the like rotates at high speed when the multi-plate clutch C is released, centrifugal oil is generated in the hydraulic chamber 20 by the hydraulic oil remaining in the hydraulic chamber 20, and the force generated by the centrifugal hydraulic pressure causes the piston member 3 to move in the direction of arrow A. There is a risk of moving and engaging the multi-plate clutch C. The canceller hydraulic chamber 22 is provided in order to suppress the influence of centrifugal oil pressure generated in such a hydraulic chamber 20. Specifically, a predetermined amount of oil is stored in the canceller hydraulic chamber 22, and when centrifugal hydraulic pressure is generated in the hydraulic chamber 20, centrifugal hydraulic pressure is also generated in the canceller hydraulic chamber 22. .. As a result, a force that opposes the force generated by the centrifugal oil pressure generated in the hydraulic chamber 20 acts on the piston member 3, and the influence of the centrifugal pressure generated in the hydraulic chamber 20 is suppressed.

The return spring 7 is provided between the piston member 3 and the canceller member 5. The return spring 7 is a coil-shaped spring, and urges the piston member 3 and the canceller member 5 in a direction in which they are separated from each other. In other words, the return spring 7 urges the piston member 3 in the direction opposite to the direction of arrow A. Specifically, the return spring 7 urges the piston member 3 in a direction approaching the bottom surface 113 of the accommodating portion 11. Therefore, in the present embodiment, the direction opposite to the direction of arrow A (the direction approaching the bottom surface 113 of the accommodating portion 11) corresponds to the "second direction" according to the present invention, and the return spring 7 corresponds to the "attachment" according to the present invention. Corresponds to "force member". The return spring 7 will be described in detail later.

The plate-side holding portion 9A is provided on the canceller member 5 and holds the end portion (lower end portion in FIG. 1) of the return spring 7 on the canceller member 5 side. The piston-side holding portion 9B is provided on the piston member 3 and holds the end portion (upper end portion in FIG. 1) of the return spring 7 on the piston member 3 side. The plate-side holding portion 9A and the piston-side holding portion 9B will be described in detail later.

Next, the operation of the clutch piston mechanism 1 will be briefly described with reference to FIGS. 1 and 2. FIG. 1 shows the state of the clutch piston mechanism 1 when the multi-plate clutch C is engaged, and FIG. 2 shows the state of the clutch piston mechanism 1 when the multi-plate clutch C is released.

As shown in FIG. 2, when the multi-plate clutch C is released, the piston member 3 is separated from the multi-plate clutch C by the urging force of the return spring 7. Specifically, in the piston member 3, the convex portion 31a is in contact with the bottom surface 113 of the accommodating portion 11, and the first outer extending portion 35 is in a state of being separated from the clutch plate C1 of the multi-plate clutch C. In this state, when the hydraulic oil is supplied to the hydraulic chamber 20 through the hydraulic oil passage 21 and the force due to the hydraulic oil in the hydraulic chamber 20 exceeds the urging force of the return spring 7, the piston member 3 moves in the direction of arrow A. The first outer extending portion 35 of the piston member 3 comes into contact with the clutch plate C1 on the drive side of the multi-plate clutch C. Then, when the supply of the hydraulic oil to the hydraulic chamber 20 is continued and the force due to the hydraulic pressure of the hydraulic oil in the hydraulic chamber 20 is further increased, as shown in FIG. 1, the first outer extending portion of the piston member 3 is extended. 35 presses the clutch plate C1 on the drive side of the multi-plate clutch C, that is, the piston member 3 further moves in the direction of arrow A. As a result, the multi-plate clutch C is engaged. Further, in the state shown in FIG. 1, when the hydraulic oil is discharged from the hydraulic chamber 20, the force due to the hydraulic oil in the hydraulic chamber 20 is less than the urging force of the return spring 7, and the state shown in FIG. 2 is obtained. return.

[Detailed structure of clutch piston mechanism]
Next, the detailed structure of the clutch piston mechanism 1 will be described with reference to FIGS. 1 to 4. FIG. 3 is a partial plan view of the canceller member 5, and FIG. 4 is an enlarged cross-sectional view of a main part of the clutch piston mechanism 1 including the piston side holding portion 9B. FIG. 4 shows a partial plan view (plan view of a quadrant) of the canceller member 5 as viewed from the bottom surface 113 side of the accommodating portion 11.

As shown in FIGS. 1 to 3, the return spring 7 is held by the plate-side holding portion 9A and the piston-side holding portion 9B described in detail below in the canceller hydraulic chamber 22, so that the axis X of the housing 10 is X. It is configured to be arranged at a plurality of places spaced around each other at a predetermined angular pitch. Specifically, the return spring 7 is a coiled spring having an inner diameter D1 and an outer diameter D2 and is wound, and the coil of the return spring 7 has a predetermined wire diameter D3. The center line X1 of the coil of each return spring 7 is configured to be parallel to the axis X of the housing 10 and to be located on a pitch circle P (see FIG. 3) having a predetermined diameter centered on the axis X.

In the present embodiment, the plate-side holding portion 9A is made of, for example, a metal material, and is in contact with the bottom surface 113-side surface of the accommodating portion 11 in the second annular plate portion 51 of the canceller member 5. In the present embodiment, as shown in FIG. 3, the plate-side holding portions 9A are located at a plurality of locations in the second annular plate portion 51 of the canceller member 5 at predetermined angular pitches around the axis X of the housing 10. Have been placed.

In the present embodiment, the plate-side holding portion 9A is formed in an annular shape. Specifically, as shown in FIGS. 1 and 2, the plate-side holding portion 9A extends radially outward from the ends of the tubular coil locking portion 9A1 and the coil locking portion 9A1 in a flange shape. It has an existing flange portion 9A2. The plate-side holding portion 9A can be formed by pressing a rolled steel sheet or the like. Although not particularly limited, the coil locking portion 9A1 has an outer diameter slightly larger than the inner diameter D1 of the coil of the return spring 7. The coil at the end of the return spring 7 on the canceller member 5 side is press-fitted along the outer peripheral surface of the coil locking portion 9A1, and the end of the return spring 7 on the canceller member 5 side is predetermined by the plate-side holding portion 9A. It is held in position.

The center of each plate-side holding portion 9A is located on a pitch circle P having a predetermined diameter centered on the axis X of the housing 10.

In the present embodiment, the piston side holding portion 9B is made of an elastic material, and is adhered to the surface of the first annular plate portion 31 of the piston member 3 opposite to the bottom surface 113 side of the accommodating portion 11 and fixed to the piston member 3. Has been done. In the present embodiment, the piston-side holding portions 9B are arranged at a plurality of locations on the second annular plate portion 51 of the canceller member 5 around the axis X of the housing 10 at the same angular pitch as the plate-side holding portions 9A. ing. The piston-side holding portion 9B is provided so as to face the plate-side holding portion 9A.

In the present embodiment, the piston-side holding portion 9B has a recess 9B1 that accommodates the end portion of the return spring 7 on the piston member 3 side. The recess 9B1 is formed in an annular groove shape corresponding to the shape of the end portion of the return spring 7 on the piston member 3 side, for example. Specifically, the recess 9B1 is formed in an annular groove shape having a semicircular cross section having a diameter slightly larger than the wire diameter D3 of the coil of the return spring 7. In other words, the width W of the groove opening of the recess 9B1 is slightly larger than the wire diameter D3 of the coil. Further, the inner diameter of the annulus of the recess 9B1 is slightly smaller than the inner diameter D1 of the coil, and the outer diameter of the annulus of the recess 9B1 is slightly larger than the outer diameter D2 of the coil. Therefore, a slight gap G is provided between the coil of the return spring 7 and the inner surface of the groove of the recess 9B1. The gap G may be set small enough to be within an allowable range in consideration of the assembling property of the clutch piston mechanism 1.

The center of the annular groove-shaped recess 9B1 of each piston-side holding portion 9B is located on a pitch circle P having a predetermined diameter centered on the axis X of the housing 10. Therefore, the line connecting the center of the plate-side holding portion 9A and the center of the recess 9B1 of the piston-side holding portion 9B is parallel to the axis X of the housing 10 and is located on the pitch circle P centered on the axis X. It is configured as follows. As a result, the center line X1 of the coil of each return spring 7 is parallel to the axis X of the housing 10 while being held by the holding portions (9A, 9B), and a pitch circle having a predetermined diameter centered on the axis X. It is designed to be located on P.

In the present embodiment, the piston side holding portion 9B is arranged at a portion of the first annular plate portion 31 of the piston member 3 that is closer to the inner cylindrical portion 32 side. Specifically, the piston-side holding portion 9B is adjacent to the inner cylindrical portion 32. Each return spring 7 is arranged along the outer surface of the inner cylindrical portion 32 of the piston member 3.

In the present embodiment, the piston side holding portion 9B is made of an elastic material of the same type as at least the inner sealing portion 36 of the inner sealing portion 36 and the outer sealing portion 37 of the piston member 3.

Here, as shown in FIG. 4, the inner seal portion 36 of the piston member 3 specifically has a tip portion 36a that comes into contact with the inner side surface 111 of the accommodating portion 11 and deforms, and a first inner portion of the piston member 3. It has a base end portion 36b fixed to an end portion of the extending portion 34. The base end portion 36b of the inner seal portion 36 is formed so as to cover the entire first inward extending portion 34. Then, in the present embodiment, the piston side holding portion 9B is integrally formed with the inner seal portion 36. Specifically, the piston-side holding portion 9B is connected to the inner seal portion 36 via a connecting portion 38 made of an elastic material of the same type as the inner seal portion 36. That is, the inner seal portion 36, the connecting portion 38, and the piston side holding portion 9B are formed simultaneously and integrally by compression molding or the like. Specifically, the connecting portion 38 extends from the outer peripheral edge of the portion covering the surface of the first inward extending portion 34 on the canceller member 5 side of the base end portion 36b toward the first annular plate portion 31. At the same time, it covers the outer peripheral surface of the inner cylindrical portion 32. Then, the end portion of the connecting portion 38 on the first annular plate portion 31 side is connected to each piston side holding portion 9B. More specifically, the outer peripheral surface of the connecting portion 38 extends linearly so as to be in contact with the outer peripheral edge of the annular groove-shaped opening of the recess 9B1 of the piston side holding portion 9B. The connecting portion 38 is located between the return spring 7 and the outer surface of the inner cylindrical portion 32 of the piston member 3, and the portion of each return spring 7 on the inner cylindrical portion 32 side is guided by the outer surface of the connecting portion 38. ing. That is, the connecting portion 38 can be expressed as a guide portion that guides the portion of the return spring 7 including the end portion on the piston member 3 side and suppresses the movement of the return spring 7 such as falling. Further, the piston side holding portion 9B can be expressed as a positioning member that holds and positions the portion of the return spring 7 on the piston member 3 side in cooperation with the connecting portion 38.

Next, an example of the method of assembling the clutch piston mechanism 1 to the housing 10 in the present embodiment will be described. In the following description, it is assumed that the return spring 7 is press-fitted into the coil locking portion 9A1 of the plate-side holding portion 9A in advance and assembled integrally with the plate-side holding portion 9A.

For example, before the piston member 3 is accommodated in the accommodating portion 11, the assembling worker puts the return spring 7 and the plate side holding portion 9A in the recess 9B1 of each piston side holding portion 9B in the piston member 3. Accommodates the coil at the end of the assembly on the piston member side. In this state, the operator brings the surface of the second annular plate portion 51 of the canceller member 5 on the bottom surface 113 side of the accommodating portion 11 into contact with the plate side holding portion 9A, and between the canceller member 5 and the piston member 3. Each assembly of the return spring 7 and the plate side holding portion 9A is sandwiched. As a result, the piston member 3, the canceller member 5, the plurality of return springs 7, and the plurality of plate-side holding portions 9A are temporarily assembled. Then, the worker inserts the temporary assembly into the accommodating portion 11. After that, the stopper ring 55 is fixed to the inner side surface 111 of the accommodating portion 11. In this state, the movement of the canceller member 5 in the arrow A direction and the movement in the radial direction are regulated by the stopper ring 55, and the assembly of the clutch piston mechanism 1 to the housing 10 is completed. The end of each return spring 7 on the piston member 3 side is held and positioned by the piston side holding portion 9B made of an elastic material, as compared with the case where the return spring 7 is held by a metal press-molded product as in the conventional case. Then, it is easy to manufacture, and it is possible to suppress an increase in cost due to increasing the certainty of holding the return spring 7.

According to the clutch piston mechanism 1 according to the present embodiment, the return spring (biasing member) can be held in this way without causing a significant increase in cost. Further, the weight of the clutch piston mechanism 1 can be reduced as compared with the clutch piston mechanism that employs a metal press-molded product as the piston side holding portion. Further, by adopting the elastic material as the material of the piston side holding portion 9B made of the elastic material, the degree of freedom in selecting the shape of the piston side holding portion 9B is improved, and as a result, the shape of the return spring 7 can be freely selected. The degree is also improved. Further, when the specifications of the return spring 7 and the arrangement layout of the return spring 7 in the canceller hydraulic chamber 22 are determined, the piston side holding portion 9B can be flexibly adjusted according to the specifications of the return spring 7 and the arrangement layout requirements. The shape and location of the spring can be set. As will be described later, the plate-side holding portion 9A may also use an elastic material as well as a metal material, and even in this case, the same effect as described above can be obtained.

In the present embodiment, the piston side holding portion 9B is made of an elastic material of the same type as the inner sealing portion 36. As a result, the increase in manufacturing cost is further suppressed. Further, in the present embodiment, the piston side holding portion 9B is integrally formed with the inner seal portion 36. As a result, the cost increase is suppressed more effectively.

In the present embodiment, the piston-side holding portion 9B has a recess 9B1 that accommodates an end portion of the return spring 7, which is a coil-shaped spring, on the piston member 3 side. As a result, the end portion of the return spring 7 can be reliably held with a simple structure.

In the present embodiment, the piston side holding portion 9B is arranged at a portion of the first annular plate portion 31 of the piston member 3 that is closer to the inner cylindrical portion 32 side, and the return spring 7 is arranged along the outer surface of the inner cylindrical portion 32. Has been done. As a result, the portion of each return spring 7 on the inner cylindrical portion 32 side is guided to the outer surface of the inner cylindrical portion 32 via the connecting portion 38. As a result, when the clutch piston mechanism 1 is assembled, the connecting portion 38 and the inner cylindrical portion 32 function as guides when assembling the return spring 7, and the assembling property is improved. Further, when the clutch piston mechanism 1 is operating, the connecting portion 38 and the inner cylindrical portion 32 guide the piston member 3 side of the return spring 7 to suppress the movement of the return spring 7 such as falling, and the return spring during operation. The stability of 7 is improved. Further, the return spring 7 can be integrated inside in the radial direction, and the clutch piston mechanism 1 can be miniaturized.

[Modification example]
In the present embodiment, the plate-side holding portion 9A is made of a metal member having a tubular coil locking portion 9A1 and a flange portion 9A2, but the present invention is not limited to this, and an appropriate shape may be used. Can be adopted. For example, the plate-side holding portion 9A may be only the coil locking portion 9A1. Further, the plate-side holding portion 9A is formed as a member separate from the canceller member 5, but the present invention is not limited to this, and as shown in FIG. 5, it may be formed integrally with the canceller member 5, and FIG. And as shown in FIG. 7, a part of the canceller member 5 may be formed so as to have a function as a plate-side holding portion 9A. FIG. 5 is a schematic cross-sectional view for explaining a modified example of the plate side holding portion 9A. FIG. 6 is a schematic cross-sectional view for explaining another modification of the plate-side holding portion 9A, and FIG. 7 is a partial plan view of the canceller member 5 shown in FIG.

Specifically, as shown in FIG. 5, the plate-side holding portion 9A is composed of a protrusion protruding from the surface of the second annular plate portion 51 of the canceller member 5 on the bottom surface 113 side of the accommodating portion 11, and is the canceller member 5. It may be formed integrally. The plate-side holding portion 9A is formed in a columnar shape having an outer diameter slightly larger than the inner diameter D1 of the coil of the return spring 7, for example.

Specifically, as shown in FIGS. 6 and 7, the intermediate cylindrical portion 52 may be configured to have a function as a plate-side holding portion 9A. Specifically, as shown in FIG. 7, the intermediate cylindrical portion 52 has a constant thickness. When viewed in a plan view from the bottom surface 113 side of the accommodating portion 11, the portion of the intermediate cylindrical portion 52 corresponding to the arrangement location of each return spring 7 bulges outward in the radial direction. Then, the portion of the intermediate cylindrical portion 52 between the bulging portions 52a is recessed so as to enter between the return springs 7 and 7 adjacent to each other. The inner surface of each bulging portion 52a is curved with a curvature corresponding to the outer diameter D2 of the coil of the return spring 7, and is formed so as to surround the return spring 7 from the outside. The inner surface of each bulging portion 52a is in contact with or close to the portion of the return spring 7 including the end portion on the canceller member 5 side. Therefore, the portion of the return spring 7 including the end portion on the canceller member 5 side is guided and positioned by the inner surface of the bulging portion 52a and is held. Therefore, in the modified examples shown in FIGS. 6 and 7, the inner surface of the bulging portion 52a in the intermediate cylindrical portion 52 of the canceller member 5 constitutes the plate-side holding portion 9A. Further, in the modified examples shown in FIGS. 6 and 7, the return spring 7 is arranged so as to be sandwiched between the inner cylindrical portion 32 of the piston member 3 and the intermediate cylindrical portion 52 of the canceller member 5. As a result, the stability of the return spring 7 during operation is improved more effectively.

In the present embodiment, the piston side holding portion 9B is made of the same type of elastic material as the inner seal portion 36, but may be made of an elastic material of a different type from that of the inner seal portion 36. Further, the piston side holding portion 9B is formed at the same time as and integrally with the inner seal portion 36, but the present invention is not limited to this. For example, the inner seal portion 36 may be formed after the piston side holding portion 9B is formed. Further, the piston side holding portion 9B may be formed separately from the inner sealing portion 36. Further, in the present embodiment, the plate side holding portion 9A is made of a metal material, but the present invention is not limited to this, and the plate side holding portion 9A may be made of an elastic material. Further, although the piston side holding portion 9B is made of an elastic material, it may be made of a metal material. In this case, the plate-side holding portion 9A may be made of an elastic material. Further, the elastic material is not limited to the rubber material, and a resin material may be used.

Although some preferred embodiments of the present invention and modifications thereof have been described above, the present invention is not limited to the above-described embodiments and the above-mentioned modifications, and various modifications and variations thereof are based on the technical idea of the present invention. It can be changed.

1 ... Clutch piston mechanism, 3 ... Piston member, 5 ... Canceller member (plate member), 7 ... Return spring (urging member), 9A ... Plate side holding part, 9B ... Piston side holding part, 9B1 ... Recessed part, 11 ... Accommodating part, 20 ... Hydraulic chamber, 36 ... Inner seal part, 37 ... Outer seal part, 111 ... Inner side surface of accommodating part, 112 ... Outer side surface of accommodating part, 113 ... Bottom surface of accommodating part, A ... From bottom surface of accommodating part Separation direction (first direction), C1 ... Clutch plate

Claims (5)

An annular piston member that moves in the first direction by the oil pressure in the hydraulic chamber and presses the clutch plate.
An annular plate member arranged on the first direction side of the piston member and restricted from moving in the first direction, and an annular plate member.
An urging member provided between the piston member and the plate member and urging the piston member in a second direction opposite to the first direction.
A plate-side holding portion provided on the plate member and holding an end portion of the urging member on the plate member side,
A piston-side holding portion provided on the piston member and holding an end portion of the urging member on the piston member side, and a piston-side holding portion.
Is a clutch piston mechanism that is housed in a ring-groove-shaped housing part.
The hydraulic chamber is a space on the bottom surface side of the piston member in the accommodating portion.
The piston member has an inner seal portion that contacts the inner side surface of the accommodating portion and an outer seal portion that contacts the outer side surface of the accommodating portion.
The plate-side holding portion or the piston-side holding portion is a clutch piston mechanism made of an elastic material. The clutch piston mechanism according to claim 1, wherein the piston-side holding portion made of the elastic material is made of at least an elastic material of the same type as the inner seal portion. The clutch piston mechanism according to claim 1 or 2, wherein the piston-side holding portion made of the elastic material is integrally formed with the inner sealing portion. The urging member is a coiled spring.
The clutch piston mechanism according to any one of claims 1 to 3, wherein the piston-side holding portion made of the elastic material has a recess for accommodating an end portion of the urging member on the piston member side. The piston member has an annular plate portion facing the bottom surface of the accommodating portion and a cylindrical portion extending from the inner peripheral side of the annular plate portion in a direction away from the bottom surface of the accommodating portion.
The piston-side holding portion made of the elastic material is arranged at a portion of the annular plate portion that is closer to the cylindrical portion.
The clutch piston mechanism according to any one of claims 1 to 4, wherein the urging member is arranged along the outer surface of the cylindrical portion.

Images