JP2017044311A - Sealing device and manufacturing method of cancel plate used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which enables simplification of a shape of an annular member of a cancel plate and enables easy manufacturing of the cancel plate.SOLUTION: A sealing device 2 includes: an annular piston seal 10 which is moved to one axial side by a fluid pressure and presses a multiple-disc clutch; an annular cancel plate 12 which is disposed coaxially with the piston seal 10 at the one axial side of the piston seal 10; and a return spring 13 which is disposed between the piston seal 10 and the cancel plate 12 and biases the piston seal 10 and the cancel plate 12 in directions such that these components separate from each other. The cancel plate 12 has: a metallic annular member 18 facing the piston seal 10; and a guide member 19 which is bonded to the annular member 18, guides the return spring, and is made of an elastic material.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a sealing device having a cancel plate used in an automatic transmission such as an automobile and disposed opposite to a piston seal slidable in the axial direction, and a method of manufacturing a cancel plate used therefor. is there.

  As shown in FIG. 6, the power connection part of the automatic transmission of the automobile includes an annular piston seal 110 that moves to one side in the axial direction by fluid pressure and presses the multi-plate clutch C, and a shaft of the piston seal 110. A sealing device 102 including a piston cancel 110 and an annular cancel plate 112 arranged coaxially is incorporated on one side in the direction (see, for example, Patent Document 1).

  The cancel plate 112 includes a metal annular member 118 disposed to face the piston seal 110, and a return spring 113 formed of a coil spring is provided between the annular member 118 and the piston seal 110. Yes. The return spring 113 biases the piston seal 110 in a direction away from the cancel plate 112.

  As shown in FIG. 7, a plurality of return springs 113 are provided along the circumferential direction of the annular member 118. The annular member 118 is provided with a plurality of guide portions 119 for positioning the return spring 113 and preventing circumferential twisting at a plurality of locations in the circumferential direction.

JP 2002-372073 A

  The annular member 118 of the cancel plate 112 is formed by pressing, and the guide portion 119 is integrally formed when the annular member 118 is pressed. However, since the plurality of guide portions 119 are formed, the structure of the annular member 118 becomes very complicated, and a plurality of steps may be required for press working of the annular member 118. Further, since the structure of the annular member 118 is complicated, there is a problem that thread-like burrs and cracks are likely to occur during molding.

  An object of the present invention is to provide a sealing device that can simplify the shape of an annular member of a cancel plate and that can be easily manufactured, and a cancel plate manufacturing method.

  The sealing device of the present invention is arranged in an axially concentric manner with the piston seal on one side in the axial direction of the piston seal, and is moved to one side in the axial direction by fluid pressure to press the multi-plate clutch. An annular cancel plate, the piston seal, and a return spring that is disposed between the cancel plate and biases the two in a direction away from each other, and the cancel plate is made of a metal that faces the piston seal. And a guide member made of an elastic material that is bonded to the annular member and guides the return spring.

  According to this configuration, since the guide member made of an elastic material that guides the return spring is bonded to the annular member, the guide member is integrally formed with the annular member by pressing as in the conventional case. The structure can be simplified and the annular member can be easily pressed.

The cancel plate further includes a seal member that is bonded to an outer peripheral end portion of the annular member to seal between the annular member and the piston seal and is formed integrally with the guide member. preferable.
According to this configuration, since the guide member is formed integrally with the seal member that seals between the annular member and the piston seal, the guide member can be formed more easily together with the seal member.

  The method for manufacturing a cancel plate according to the present invention is a method for manufacturing a cancel plate disposed on one side in the axial direction of an annular piston seal that moves to one side in the axial direction by fluid pressure and presses the multi-plate clutch. The cancel plate is made of a metal annular member facing the piston seal, and an elastic material provided at an outer peripheral end of the annular member to seal between the annular member and the piston seal. A seal member, and a guide member made of an elastic material that guides a return spring disposed between the piston seal and the cancel plate, and the annular member and the unvulcanized rubber material are placed in the mold. The seal member and the guide member are integrally vulcanized and molded by pressurizing and heating the rubber material. Characterized by vulcanization bonded to Jo member.

  According to this method, since the guide member and the seal member are integrally vulcanized and molded and vulcanized and bonded to the annular member, the step of integrally molding the guide member and the seal member, the guide member and the seal The step of bonding the member to the annular member can be performed at the same time, and the cancel plate can be easily manufactured.

  According to the present invention, the shape of the annular member of the cancel plate can be simplified and the manufacture thereof can be easily performed.

It is sectional drawing of the sealing device which has the cancellation plate which concerns on embodiment. It is a front view of the cancellation plate which concerns on embodiment. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 2. It is CC sectional view taken on the line of FIG. It is sectional drawing of the sealing device which has the cancellation plate which concerns on a prior art. It is a front view of the cancellation plate which concerns on a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a sealing device having a cancel plate according to the embodiment.
In FIG. 1, a power transmission mechanism 1 includes a multi-plate clutch (clutch member) C for intermittently transmitting power to a speed change mechanism (not shown) such as a planetary gear set, and a multi-plate clutch C for operating the multi-plate clutch C. The sealing device 2 provided with the function as a clutch piston and the housing 20 which accommodates these inside are provided.

  The housing 20 is an annular member formed in a concave cross section that opens to one side in the axial direction by, for example, sheet metal pressing using a hot rolled steel plate or the like, and a cylinder portion 21 in which the sealing device 2 is inserted, An outer cylindrical portion 22 connected to an end portion on one axial side (left side in FIG. 1) of the outer peripheral wall 21a of the cylinder portion 21 is provided, and the multi-plate clutch C is accommodated in the outer cylindrical portion 22. . An annular portion 24 is provided between the cylinder portion 21 and the outer cylindrical portion 22 along the radial direction.

  The sealing device 2 is inserted into the cylinder portion 21 and forms an annular bonded piston seal 10 that forms a first oil chamber R1 with the cylinder portion 21, and an axially one side of the bonded piston seal 10. There are provided an annular cancel plate 12 disposed opposite to each other and a return spring 13 disposed between the bonded piston seal 10 and the cancel plate 12. The bonded piston seal 10 functions as a clutch piston that operates the multi-plate clutch C.

The bonded piston seal 10 includes a metal ring 11 that is a metal annular member, and a first seal member 14 that is fixed to the outer surface of the metal ring 11. The metal ring 11 is formed, for example, by punching a metal plate material such as SAPH (hot rolled steel plate for automobile structure) defined in JIS G 3113 with a press machine.
The metal ring 11 includes an annular portion 11a facing the bottom wall 21b of the cylinder portion 21, and an inner cylindrical portion extending from the inner peripheral edge of the annular portion 11a to one side in the axial direction along the inner peripheral wall 21c of the cylinder portion 21. 11b, an outer cylindrical portion 11c extending from the outer peripheral edge of the annular portion 11a to one side in the axial direction along the outer peripheral wall 21a of the cylinder portion 21, and a flange extending radially outward from one axial end portion of the outer cylindrical portion 11c Part 11d.

The flange portion 11d is provided with a pressing surface 11e that presses the multi-plate clutch C and a plurality of engaging teeth 11f that protrude outward in the radial direction from the pressing surface 11e.
The first seal member 14 is vulcanized and bonded to the radially outer end of the side surface of the annular portion 11a on the first oil chamber R1 side using an elastic member such as synthetic rubber. Moreover, the 1st seal member 14 has the outer peripheral side seal lip 14b which slidably contacts the inner peripheral surface of the outer peripheral wall 21a.

A concave groove 21 c 2 is formed on the outer peripheral surface of the inner peripheral wall 21 c of the cylinder portion 21. A second seal member 17 made of an O-ring is attached to the concave groove 21c2. The second seal member 17 is in sliding contact with the inner peripheral surface of the inner cylindrical portion 11 b of the bonded piston seal 10.
The first seal member 14 and the second seal member 17 seal the first oil chamber R <b> 1 by sealing between the bonded piston seal 10 and the cylinder portion 21.

The inner peripheral wall 21c of the cylinder part 21 is provided with a supply port 21c1 for supplying hydraulic oil to the first oil chamber R1. By controlling the hydraulic pressure of the hydraulic fluid supplied from the supply port 21c1 to the first oil chamber R1, the bonded piston seal 10 can be reciprocated in the axial direction within the cylinder portion 21.
The bonded piston seal 10 is moved to the axial direction one side (left side in FIG. 1) in the cylinder portion 21 by the hydraulic pressure of the hydraulic oil supplied to the first oil chamber R1, and is pressed by the pressing surface 11e of the flange portion 11d. Press the clutch C.

  The cancel plate 12 forms a second oil chamber R <b> 2 between the bonded piston seal 10 and the housing 20. Similar to the bonded piston seal 10, the cancel plate 12 includes an annular member 18 formed by punching a metal plate material with a press machine and a third seal provided at an outer peripheral end of the annular member 18. A member 16 and a guide member 19 for guiding the return spring 13 are provided.

  The annular member 18 connects the large-diameter annular portion 18a located on the inner peripheral side of the bonded piston seal 10 and the small-diameter annular portion 18b located closer to one end in the axial direction than the large-diameter annular portion 18a. And a cylindrical portion 18c.

The inner peripheral end of the small-diameter annular portion 18 b is disposed along the inner cylindrical portion 23 of the housing 20, and the movement to one side in the axial direction is restricted by the stopper 15 fixed to the inner cylindrical portion 23. ing.
An annular third seal member 16 that seals between the bonded piston seal 10 is fixed to the outer peripheral end of the large-diameter annular portion 18a. The 3rd seal member 16 consists of elastic materials, such as rubber, and is pasted up on the perimeter end of large diameter annular part 12a. As shown in FIG. 2, the third seal member 16 includes a base portion 16b provided so as to cover the outer peripheral end of the large-diameter annular portion 12a and an outer periphery of the bonded piston seal 10 by extending from the base portion 16b to the outer peripheral side. A seal lip 16a is slidably in contact with the inner peripheral surface of the cylindrical portion 11c. The third seal member 16 seals the second oil chamber R2 by sealing between the cancel plate 12 and the bonded piston seal 10.

  The return spring 13 is interposed between the bonded piston seal 10 and the cancel plate 12. Specifically, the return spring 13 abuts on the annular portion 11 a of the bonded piston seal 10 and the small-diameter annular portion 18 b of the annular member 18, thereby urging them in a direction away from each other in the axial direction. When the released spring 13 is released from the state in which the bonded piston seal 10 moves to one side in the axial direction and presses the multi-plate clutch C, the return spring 13 causes the bonded piston seal 10 to be Quickly move in the other direction (right side in FIG. 1).

  The multi-plate clutch C is configured by superimposing a large number of friction plates C1, and when pressed by the bonded piston seal 10, the friction plates C1 are pressed and transmit power to the transmission mechanism. On the other hand, when the pressing is released, the power transmission is cut off. That is, the sealing device 2 can actuate the multi-plate clutch C by the reciprocating movement of the bonded piston seal 10 in the axial direction to interrupt the transmission of power by the multi-plate clutch C. The clutch in the power transmission mechanism 1 It has a function as a piston.

FIG. 2 is a front view of the cancel plate.
As shown in FIGS. 1 and 2, a guide member 19 is provided on the inner peripheral surface of the cylindrical portion 18 c of the annular member 18 of the cancel plate 12. The guide member 19 is made of an elastic material such as rubber and is bonded to the inner peripheral surface of the cylindrical portion 18c. A plurality of guide members 19 are formed in the circumferential direction along the inner peripheral surface of the cylindrical portion 18c. Each guide member 19 is formed in a substantially arc shape, and protrudes radially inward from the inner peripheral surface of the cylindrical portion 18c. Between the adjacent guide members 19, a recessed portion 26 is formed that is recessed in an arc shape outward in the radial direction. The return spring 13 is disposed in the concave portion 26 between the adjacent guide members 19, and an approximately half area of the outer periphery of the coil is guided by the guide member 19.

  As shown in FIGS. 3 to 5, a covering member 25 is provided on the side surface on the piston seal 10 side of the large-diameter annular portion 18 a of the annular member 18 and the inner peripheral surface of the cylindrical portion 18 c. Yes. The covering member 25 also functions as a connection member that connects the third seal member 16 and the guide member 19. The covering member 25 is made of the same elastic material as the third seal member 16 and the guide member 19. The third seal member 16, the guide member 19, and the covering member 25 are integrally formed on the annular member 18. Specifically, the third seal member 16, the guide member 19, and the covering member 25 are formed as follows.

  First, an unvulcanized rubber material is disposed in the mold together with the annular member 18. Then, the rubber material is heated and pressurized through a mold. As a result, the third seal member 16, the guide member 19, and the covering member 25 are integrally vulcanized and simultaneously vulcanized and bonded to the annular member 18. The third seal member 16, the guide member 19, and the covering member 25 can be formed of, for example, hydrogenated nitrile rubber (HNBR), nitrile rubber (NBR), acrylic rubber (ACM), fluorine rubber (FKM), or the like. .

  The guide member 19 can position the return spring 13 and suppress twisting of the return spring 13 in the circumferential direction. Since the guide member 19 is vulcanized and bonded to the annular member 18, it is not necessary to press-mold the guide portion integrally with the annular member as in the prior art, and the structure of the annular member 18 can be simplified. In particular, the cylindrical portion 18c of the annular member 18 can be formed on a cylindrical surface without unevenness. Therefore, the press work of the annular member 18 becomes easy, and the occurrence of thread-like burrs and cracks can be suppressed. In addition, in order to integrally form the guide portion with the cylindrical portion 18c of the annular member 18 as in the prior art, a certain amount of axial width is required for the cylindrical portion 18c, and manufacturing is limited. By providing the separate guide member 19, the degree of freedom in manufacturing the cancel plate 12 can be increased.

  The covering member 25 covers one side surface of the large-diameter annular portion 18a in the annular member 18 and the entire inner peripheral surface of the cylindrical portion 18c. Thereby, the adhesive strength of the 3rd seal member 16 and the guide member 19 can be raised. Further, since the covering member 25 does not reach the small-diameter annular portion 18b of the annular member 18, the return spring 13 can be brought into direct contact with the small-diameter annular portion 18b that is a metal.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims.
For example, in the above embodiment, the guide member 19 and the third seal member 16 are integrally molded, but can be molded separately. In this case, rubber materials for molding the guide member 19 and the third seal member 16 together with the annular member 18 are loaded into the molds, and the guide member 19 and the third seal member 16 are vulcanized and bonded to the annular member 18 respectively. May be. However, the cancel plate 12 can be more easily manufactured by integrally forming the guide member 19 and the third seal member 16.

The guide member 19 and the third seal member 16 may be integrated with the annular member 18 by being molded integrally by vulcanization molding or the like separately from the annular member 18 and bonded to the annular member 18 after molding.
Although the guide member 19 of the above embodiment is formed in an arc shape, the shape is not particularly limited as long as the return spring 13 can be guided. Further, the number of guide members 19 can be appropriately changed according to the number of return springs 13.

  2: sealing device, 10: piston seal, 12: cancel plate, 13: return spring, 16: third seal member, 18: annular member, 19: guide member, 25: covering member, C: multi-plate clutch

Claims (3)

An annular piston seal that moves to one side in the axial direction by fluid pressure and presses the multi-plate clutch;
An annular cancel plate disposed coaxially with the piston seal on one side in the axial direction of the piston seal;
A return spring that is disposed between the piston seal and the cancel plate and urges the piston seal in a direction away from the piston seal;
The cancellation plate is
A metal annular member facing the piston seal;
And a guide member made of an elastic material, which is bonded to the annular member and guides the return spring.   The cancel plate further includes a seal member that is bonded to an outer peripheral end portion of the annular member to seal between the annular member and the piston seal, and is formed integrally with the guide member. The sealing device according to claim 1. A method of manufacturing a cancel plate disposed via a return spring on one side in the axial direction of an annular piston seal that moves to one side in the axial direction by fluid pressure and presses the multi-plate clutch,
The cancel plate includes a metal annular member opposed to the piston seal, and a seal member made of an elastic material provided at an outer peripheral end of the annular member to seal between the annular member and the piston seal. And a guide member made of an elastic material that guides the return spring,
The annular member and the unvulcanized rubber material are placed in a mold, and the rubber member is heated and pressurized to integrally vulcanize and mold the seal member and the guide member and add the annular member to the annular member. A method of manufacturing a cancel plate, characterized by performing sulfur bonding.

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