JP2008128372A - Bonded piston seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bonded piston seal causing no shift shock when a pressing part provided at a piston member abuts on or presses/engages a multiple disc clutch. <P>SOLUTION: The bonded piston seal 1 comprises the piston member 10 disposed in a cylinder 70 of bottomed cylinder shape to partition a pressure chamber M between itself and the cylinder 70, and the pressing part 40 pressing the multiple disc clutch 80 located on the axially opposite side to the pressure chamber M through the piston member 10. The pressing part 40 is composed of a turn-around part 41 connected to an outer peripheral cylinder part 13 of the piston member 10, and a columnar part 50 formed of a rubber elastic body stuck to the turn-around part 41 so that a tip part 51 abutting on the multiple disc clutch 80 axially projects onto the multiple disc clutch side B rather than a bent part 44 of the turn-around part 41 to have a radial space part 56 between itself and the turn-around part 41. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bonded piston seal (BPS) having a pressing portion that presses a multi-plate clutch used for clutch engagement in an automatic transmission of an automobile.

  Conventionally, as this type of BPS, those shown in FIGS. 3 and 4 are known. FIG. 3 is a schematic cross-sectional view showing the BPS cut along a plane passing through the axis O together with the multi-plate clutch, and FIG. 4 is an enlarged view of a portion X in FIG. 3. The BPS shown in FIG. The automatic transmission is used for clutch engagement.

  The BPS 101 includes a bottomed cylindrical piston member 103 that is formed of a metal that axially displaces the inside of the bottomed cylindrical cylinder 102 to define a pressurizing chamber M, and an inner peripheral cylinder of the piston member 103. An inner peripheral seal lip 105 that is fixed to the portion 104 and seals the cylinder peripheral surface 102a, and a pressure chamber side A (upper side in FIG. 3) end of the outer peripheral cylindrical portion 106 of the piston member 103 is fixed to seal the cylinder peripheral surface 102b. And a pressing portion 109 that presses the multi-plate clutch 108 positioned on the opposite side of the pressurizing chamber M through the piston member 103. The pressing portion 109 includes the piston member 103. The outer peripheral cylindrical portion 106 is formed by a flange portion 106A bent to the outer diameter side that is connected to the end of the multi-plate clutch side B (lower side in FIG. 3).

  The pressing portion 109 presses the multi-plate clutch 108 to engage the clutch when the piston member 103 is displaced to the multi-plate clutch side B in the axial direction due to the pressure fluctuation of the pressurizing chamber M, but is made of metal. Since it is molded, there is a possibility that a shift shock may occur due to insufficient impact pressure control when contacting the multi-plate clutch 108 and during pressing and engagement, or due to variations in sliding resistance.

  In Patent Document 1 below, in order to prevent the spline from being worn by the relative rotation in the friction mechanism of the multi-plate clutch, the pressing portion formed of an elastic body is arranged in the axial direction of the outer peripheral cylindrical portion of the piston portion. It has been proposed to be attached to the front end of the plate clutch, but the object configuration is different from the present invention.

Japanese Utility Model Publication No. 06-035678

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is when the pressing portion provided on the piston member comes into contact with or presses and engages the multi-plate clutch. Another object is to provide a BPS that does not generate a shift shock.

  In order to achieve the above object, a bonded piston seal according to a first aspect of the present invention includes a piston member disposed inside a bottomed cylindrical cylinder and defining a pressurizing chamber with the cylinder, and the piston In a bonded piston seal provided with a pressing portion that presses the multi-plate clutch positioned on the opposite side in the axial direction with the pressurizing chamber via a member, the pressing portion is connected to an outer peripheral cylindrical portion of the piston member. And a distal end portion that is fixed to the folded portion and abuts against the multi-plate clutch protrudes in the axial direction from the bent portion of the folded portion toward the multi-plate clutch, and is a radial space between the folded portion and the folded portion. And a columnar portion of a rubber-like elastic body having

  A bonded piston seal according to a second aspect of the present invention is the bonded piston seal according to the first aspect, wherein the bonded piston seal is provided on a peripheral surface of the cylinder at a distal end portion in an outer diameter direction of the flange portion of the folded portion. A detent collar that engages with the recessed portion is formed.

  The present invention has the following effects.

  That is, in the BPS according to the first aspect of the present invention having the above-described configuration, the pressing portion protrudes toward the multi-plate clutch in the axial direction from the bent portion of the turned-up portion in the axial direction. Since the columnar portion is formed of a rubber-like elastic body, the tip of the columnar portion comes into contact with the multi-plate clutch before the bent portion of the folded portion. At the same time, the impact at the time of pressing or engaging can be reduced, and the variation in sliding resistance can be reduced, and the occurrence of a shift shock can be prevented.

  In addition, since the columnar portion has a radial space between the folded portion and the folded portion, the columnar portion of the rubber-like elastic body is pressed by the multi-plate clutch to bend, and thereafter, the bent portion of the folded portion has many bent portions. Even if it makes contact with the plate clutch, the space portion becomes a relief portion of the bent portion of the columnar portion of the rubber-like elastic body, and the bent portion of the columnar portion of the rubber-like elastic body is between the folded portion and the multi-plate clutch. It is possible to prevent pinching. Furthermore, since the bent portion of the folded portion comes into contact with the multi-plate clutch, the amount of deflection of the columnar portion of the rubber-like elastic body can be limited, and abnormal deformation of the columnar portion of the rubber-like elastic body can be prevented.

  Further, the BPS according to claim 2 is fixed to the cylinder since the rotation stop collar that engages the recess formed in the peripheral surface of the cylinder is formed at the outer diameter direction tip of the flange portion of the folded portion. Thus, relative rotation with the multi-plate clutch is prevented, and wear when the columnar portion of the rubber-like elastic body comes into contact with and is pressed against the multi-plate clutch can be suppressed, thereby extending the life.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic sectional view showing a BPS according to the present invention cut along a plane passing through an axis O together with a multi-plate clutch, and FIG. 2 is an enlarged view of a portion X in FIG. BPS is used for clutch engagement in an automatic transmission of an automobile.

  The BPS 1 seals the inside of the bottomed cylindrical cylinder 70, and includes a piston member 10, an inner peripheral seal lip 20, an outer peripheral seal lip 30, and a pressing portion 40 that presses the multi-plate clutch 80. Yes.

  The piston member 10 is formed by press-molding a sheet metal and has a bottomed cylindrical shape. The bottom portion 11 is located on the pressure chamber M side (upper side in FIG. 1) A defined by the cylinder 70, and the bottom portion thereof. 11 extends from the inner diameter side end portion 11 to the multi-plate clutch side (lower side in FIG. 1) B in the axial direction, and extends from the outer diameter side end portion of the bottom portion 11 to the multi-plate clutch side B in the axial direction. It consists of an outer peripheral cylinder part 13.

  The inner peripheral cylindrical portion 12 has an inner peripheral bent portion 14 formed by bending an end B of the multi-plate clutch in the axial direction in the inner diameter direction, and the inner peripheral bent portion 14 includes an outer periphery of the inner peripheral cylindrical portion of the cylinder 70. An inner peripheral seal lip 20 that is slidably in close contact with the surface 72 and extends toward the pressure chamber side A is fixed. Further, an outer peripheral seal lip 30 that is slidably in close contact with the inner peripheral surface 73 of the outer peripheral cylinder portion of the cylinder and extends toward the pressurization chamber side A is fixed to the corner portion 15 of the outer peripheral cylinder portion 13 on the pressurization chamber side A. In addition, the inner peripheral seal lip 20 and the outer peripheral seal lip 30 are connected by a film portion 21 that covers the inner peripheral cylindrical portion 12 and the bottom portion 11 of the piston member 10.

  The pressing portion 40 presses the multi-plate clutch 80 positioned on the opposite side to the pressurizing chamber M through the bottom portion 11 of the piston member 10, and includes a folded portion 41 and a columnar portion 50. Yes. The folded portion 41 is connected to the multi-plate clutch side B end portion 16 of the outer circumferential cylindrical portion 13 of the piston member 10, and includes an inner circumferential folded portion 42, an outer circumferential folded portion 43, and a bent portion 44 connecting between them. It consists of a flange portion 45 extending in the outer diameter direction from the pressurizing chamber side A end portion of the outer peripheral folded portion 43. A plurality of non-rotating collars 60 equally disposed in the circumferential direction engaging with the recesses 74 formed in the inner circumferential surface 73 of the outer circumferential cylindrical portion of the cylinder 70 are provided at the distal end portion of the flange portion 45 in the outer diameter direction. Is formed. The concave portion 74 prevents the piston member 10 from rotating, and the axial stroke of the piston member 10 allows this, so that the concave portion 74 is formed in a groove shape extending in the axial direction.

  The columnar portion (also referred to as a rubber stopper portion) 50 is formed of a rubber-like elastic body, and is fixed (attached) to the multi-plate clutch side B end surface 45a of the flange portion 45. The contact surface 51a of the tip portion 51 of the columnar portion 50 protrudes from the contact surface 44a of the bent portion 44 of the folded portion 41 to the multi-plate clutch side B in the axial direction by h, whereby the cylinder 70 and the piston member When the piston member 10 is displaced to the multi-plate clutch side B by the pressure of the pressurizing chamber M defined by the cylinder 10, the rubber-like elastic columnar portion 50 is provided before the bent portion 44 of the metal folded portion 41. The front end portion 51 is in contact with the multi-plate clutch 80. The columnar portion 50 made of a rubber-like elastic body may be formed integrally with the rubber-like elastic body on the outer peripheral seal lip 30 side. In this case, both of the through holes provided in the flange portion 45 and the flange portion 45 are provided. They are integrated via the outer periphery.

  Further, the base portion 52 of the columnar portion 50 is in intimate contact with the outer peripheral folded portion 43, but the tip portion 51 is not in contact with the bent portion 44 and has a space portion 56 in the radial direction. A relief portion (a relief space at the time of elastic deformation) is formed when the tip portion 51 comes into contact with the multi-plate clutch 80 and is further pressed to bend the columnar portion 50.

  In the pressing portion 40 configured as described above, the contact surface 51a of the tip portion 51 of the columnar portion 50 protrudes from the contact surface 44a of the bent portion 44 of the folded portion 41 to the multi-plate clutch side B by h. When the piston member 10 is displaced to the multi-plate clutch side B by the pressure in the pressurizing chamber M and the pressing portion 40 comes into contact with the multi-plate clutch 80, the columnar portion 50 of the rubber-like elastic body is ahead of the metal folded portion 41. Since only the columnar portion 50 presses the multi-plate clutch 80, the impact can be mitigated and the occurrence of a shift shock can be prevented. Further, since the bent portion 44 of the metal folded portion 41 comes into contact with the multi-plate clutch 80 after the columnar portion 50 is abutted and pressed, the amount of deflection of the columnar portion 50 can be limited. Abnormal deformation can be prevented.

  Further, since the columnar part 50 has a radial space 56 between the columnar part 50 and the folded-back part 41, a relief of a bent part due to the columnar part 50 pressing the multi-plate clutch 80 in the space 56. Part. Therefore, even if the columnar portion 50 is bent and the bent portion 44 of the folded portion 41 comes into contact with the multi-plate clutch 80, the bent portion of the columnar portion 50 is sandwiched between the bent portion 44 and the multi-plate clutch 80. Can be prevented.

  Further, since the detent brim 60 formed at the outer diameter end of the flange portion 45 engages with the recess 74 formed in the inner peripheral surface 73 of the outer cylindrical portion of the cylinder 70, Relative rotation between the fixed multi-plate clutch 80 and the piston member 10 can be prevented, and wear due to relative rotation when the columnar portion 50 of the rubber-like elastic body comes into contact with or presses the multi-plate clutch 80 is suppressed. It becomes possible to do.

Sectional drawing of the principal part of BPS which concerns on this invention Enlarged view of part X in FIG. Cross-sectional view of the main part of a BPS according to a conventional example Enlarged view of part X in FIG.

Explanation of symbols

1 BPS
DESCRIPTION OF SYMBOLS 10 Piston member 11 Bottom part 12,13 Tube part 14,44 Bending part 16 End part 20,30 Seal lip 21 Film part 40 Press part 41 Folding part 45 Flange part 50 Columnar part 51 Tip part 44a, 51a Contact surface 56 Space part 60 Stop collar 70 Cylinder 74 Recess 80 Multi-plate clutch A Pressure chamber side B Multi-plate clutch side

Claims (2)

A piston member that is disposed inside a cylindrical cylinder with a bottom and defines a pressurizing chamber with the cylinder, and a multi-plate clutch that is positioned on the opposite side of the pressurizing chamber in the axial direction is pressed via the piston member. In a bonded piston seal provided with a pressing part that
The pressing portion includes a folded portion continuously provided on the outer peripheral cylindrical portion of the piston member, and a tip portion fixed to the folded portion and contacting the multi-plate clutch in an axial direction more than the bent portion of the folded portion. A bonded piston seal comprising a rubber-like elastic columnar portion protruding toward the clutch and having a radial space between the folded portion and the folded portion. The bonded piston seal according to claim 1,
A bonded piston seal characterized in that a non-rotating brim that engages with a recess provided in a peripheral surface of the cylinder is formed at a distal end portion in the outer diameter direction of the flange portion of the folded portion.

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