JP3745815B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device used for, for example, a piston portion that switches and operates a clutch of a shift switching device of an automatic transmission for an automobile.
[0002]
[Prior art]
As a conventional sealing device of this type, for example, as shown in FIG. 2 (a), there is one used for a piston portion that switches a clutch of a shift switching device of an automatic transmission.
[0003]
In the figure, reference numeral 100 denotes a sleeve attached to a shaft (not shown), and a housing 103 having an annular hole 101 and a passage 102 communicating with the annular hole 101 is attached to the outer peripheral surface of the sleeve 100.
[0004]
In addition, a multi-plate clutch 105 is provided on the outer peripheral side of the sleeve 101 via a holding member 104 attached to the outer peripheral surface of the sleeve 100 with a predetermined axial distance from the housing 103. A metal ring 106 is arranged between the annular hole 101 so as to be movable in the axial direction.
[0005]
The metal ring 106 includes a piston portion 107 that can move in the axial direction in the annular hole 101 and a pressing portion 108 that presses the multi-plate clutch 105.
[0006]
Sealing lips 109 and 110 made of rubber-like elastic bodies are provided on the inner and outer peripheries of the piston portion 107 as seal members that slidably come into sealing contact with the inner and outer peripheral surfaces of the annular hole 101. Thereby, the pressure chamber D is formed by the annular hole 101 and the piston portion 107.
[0007]
In addition, an inward flange portion 111 extending radially inward is provided at an end portion of the piston portion 107 in the axial direction multi-plate clutch 105 side, and the multi-plate clutch 105 side is provided at an inner diameter end of the inward flange portion 111. A pressing portion 108 extending toward is provided.
[0008]
Then, as the hydraulic pressure P acting on the pressure chamber G from the passage 102 of the housing 103 increases, the end H of the pressing portion 108 pushes the multi-plate clutch 105 via the piston portion 107 of the metal ring 106 to transmit power. It has become.
[0009]
Further, in order to release the transmission of the power, a return spring 112 as an urging means for urging the piston portion 107 toward the acting side of the hydraulic pressure P to release the pressing portion 108 from the multi-plate clutch 105 via a guide. Are provided on the same circumference.
[0010]
A lower spring seat 113 for guiding the lower part of the return spring 112 is provided on the inner peripheral side of the housing 103 in the vicinity of the multi-plate clutch 105, and its movement in the axial direction is restricted by a stopper 114.
[0011]
An upper spring seat 115 as a guide for a washer-like return spring 112 as shown in FIG. 2B is provided on the end surface of the inward flange portion 111 of the piston portion 107 so as to face the lower spring seat 113.
[0012]
That is, the return spring 112 is provided between the upper spring seat 115 and the lower spring seat 113, and the urging force of the return spring 112 releases the pressing portion 108 from the multi-plate clutch 105, thereby canceling power transmission and The ring 106 is returned to the original position.
[0013]
Further, as a guide for the return spring 112, there is a rubber protrusion 116 made of a rubber-like elastic body which is integrally formed with seal lips 109 and 110 provided on the inner and outer circumferences of the piston portion 107 as shown in FIG. The rubber protrusion 116 is guided by the inner peripheral portion of the return spring 112.
[0014]
[Problems to be solved by the invention]
However, in the case where the guide of the return spring 112 is the rubber protrusion 116, the return spring 112 shifts to the left or right or is lifted up and down, and has a disadvantage that durability is inferior due to generation of a crack.
[0015]
Further, when the guide of the return spring 112 is the spring seat (upper spring seat 115) as described above, the upper spring 115 is subjected to circular boss processing as shown in FIGS. Since the outer diameter B of the boss 117 is slightly larger than the inner diameter A of the return spring 112 to provide a tightening margin and the return springs 112 are fitted one by one, there is a drawback that the assembling property is deteriorated. It was.
[0016]
In addition, since the return spring 112 has a spring property, mechanical push-in is impossible, and it is almost a manual assembly.
[0017]
Further, during the endurance, the fitting portion between the upper spring seat 115 and the inward flange portion 111 of the piston portion 107 causes the upper spring seat 115 to be displaced due to wear, deformation, etc., so that the return spring 112 is displaced or disengaged. It was easy and it was difficult to maintain functional stability.
[0018]
The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide a sealing device capable of improving the durability and assembling property and stabilizing the function. It is to provide.
[0019]
[Means for solving problems]
In order to achieve the above object, according to the present invention, a housing having an annular hole in which a piston portion for performing clutch switching of a shift switching device for an automatic transmission operates, and a passage communicating with the annular hole,
A metal ring that constitutes the piston portion that is movably inserted in the axial direction into the annular hole of the housing ;
The metal ring includes an L-shaped section having a pressure end wall capable of coming into contact with the radial surface of the annular hole, and a U-shaped section formed radially outward from the L-shaped section. An inner peripheral seal lip that is extended and integrally baked and fixed to the inner diameter end of the pressure end wall of the L-shaped portion, and is integrally baked to the corner on the opening end face side of the annular hole of the U-shaped portion. A fixed outer peripheral seal lip is provided integrally, and fluid pressure from the passage of the housing acts on the inner diameter end of the inward flange portion extending radially inward of the U-shaped portion on the multi-plate clutch side. A guide for guiding an urging means for urging the metal ring toward the side is provided, and a plurality of pressing portions for pressing the multi-plate clutch are formed in a circumferential direction, and the guide and the pressing portion are arranged in the metal ring. It is characterized by being provided integrally with and positioned at substantially the same diameter .
[0020]
In the sealing device having the above configuration, the guide of the urging means for urging the metal ring toward the fluid pressure acting side from the passage of the housing is formed integrally with the metal ring. Since it is made of metal and becomes strong, the urging means does not shift to the left or right, or peels off when it is moved up and down, and does not crack. From these, durability improves.
[0021]
In addition, a conventional spring seat is not fitted to a metal ring after a spring as a biasing means is fitted and fixed to a separate spring seat, and the biasing means is integrally formed with the metal ring. Since it only needs to be attached, the assembling property of the urging means is improved.
[0022]
Furthermore, since the guide of the urging means is formed integrally with the metal ring, the guide and the metal ring do not have a fitting portion. Therefore, the guide is not displaced due to wear, deformation or the like at the fitting portion between the guide and the metal ring during durability as in the prior art.
[0023]
Therefore, it is possible to prevent the biasing means from being displaced or disengaged during the endurance, and the function can be stabilized.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on the illustrated embodiments.
[0025]
FIG. 1 is a cross-sectional view of a main part in which a sealing device according to an embodiment of the present invention is used for a piston portion of an automatic transmission such as an automobile as in the prior art.
[0026]
In the figure, reference numeral 1 denotes a sleeve, and the sleeve 1 is attached to a rotating shaft (not shown). A housing 2 is attached to the outer peripheral surface above the sleeve 1.
[0027]
The housing 2 has an annular hole 3 at a predetermined radial distance from the outer peripheral surface of the sleeve 1, and a passage 21 communicating with the annular hole 3 is provided. Further, the outer diameter side wall surface 31 of the annular hole 3 extends downward by a predetermined length, and the outer diameter side wall surface 31 and the outer peripheral surface of the sleeve 1 form a second annular hole 4. Further, the inner diameter side wall surface 32 extends upward, and has an annular recess 5 on the inner peripheral side from the passage 21.
[0028]
A multi-plate clutch 7 is provided on the outer peripheral side of the sleeve 1 below the second annular hole 4 via a holding member 6 attached to the outer peripheral surface of the sleeve 1 so as to face the second annular hole 4.
[0029]
The holding member 6 has a flat L-shaped member 61 that holds the axial end of the multi-plate clutch 7 and an L-shaped cross-section that holds the inner peripheral portion of the multi-plate clutch 7 assembled on the upper surface of the flat member 61. The multi-plate clutch 7 is provided on the upper surface of the flat member 61 on the outer peripheral side of the L-shaped member 62.
[0030]
A metal ring 8 is inserted into the annular hole 3 so as to be movable in the axial direction, and is made of a rubber-like elastic body as a seal member for sealing between the inner and outer peripheral surfaces of the metal ring 8 and the inner and outer peripheral surfaces of the annular hole 3. Seal lips 9 and 10 are provided.
[0031]
The metal ring 8 includes a piston portion 83 including a cross-sectional L-shaped portion 81 located on the inner diameter side of the annular hole 3 and a substantially U-shaped portion 82 located on the outer diameter side, and a substantially U-shaped cross-section portion 82. A pressing portion 84 that extends from the inner diameter end to the multi-plate clutch 7 side by a predetermined length and presses the multi-plate clutch 7 is provided.
[0032]
The L-shaped section 81 has a washer-shaped pressure end wall 81A facing the opening end surface 22 of the passage 21 of the housing 2 and an outer diameter end portion of the pressure end wall 81A in the axial direction toward the multi-plate clutch 7 side. The cylindrical portion 81B extends. A substantially U-shaped section 82 is provided at the outer diameter end of the cylindrical portion 81B so as to open inward in the radial direction.
[0033]
The inner peripheral seal lip 9 is integrally baked and fixed to the inner diameter end of the pressure end wall 81A of the L-shaped section 81.
[0034]
The inner peripheral seal lip 9 is inclined so as to extend toward the annular recess 5 of the axial housing 2 and open radially inward, and the tip of the lip is slidable on the inner diameter side wall surface 32 of the annular hole 3. In sealing contact.
[0035]
Further, the outer peripheral seal lip 10 is integrally baked and fixed to a corner portion of the annular hole 3 of the substantially U-shaped section 82 on the opening end surface 22 side.
[0036]
The outer peripheral seal lip 10 is inclined so as to extend toward the axially open end face 22 and open outward in the radial direction, and the tip of the lip is slidably sealed in contact with the outer diameter side wall face 31 of the annular hole 3. is doing.
[0037]
Thus, the pressure chamber F is formed between the piston portion 83 of the metal ring 8 and the annular hole 3 of the housing 2 via the inner peripheral seal lip 9 and the outer peripheral seal lip 10.
[0038]
Further, the end surface of the pressure end wall 81A of the L-shaped section 81 and the outer peripheral surface of the cylindrical portion 81B are entirely covered with the end surfaces of the rubber-like elastic material and the outer peripheral covering portions 11 and 12, and the cross section substantially U The end face on the opening end face 22 side and the outer peripheral face of the character-like part 82 are entirely covered with the end face and the outer peripheral covering parts 13 and 14 made of a rubber-like elastic material.
[0039]
Accordingly, the inner peripheral seal lip 9 and the outer peripheral seal lip 10 are integrally formed with the end faces of the L-shaped section 81 and the substantially U-shaped section 82 and the inner peripheral covering sections 11, 13, 12, and 14. .
[0040]
The end face covering portion 11 of the L-shaped section 81 is in contact with the opening end face 22 of the annular hole 3, thereby positioning the metal ring 8 in the axial direction.
[0041]
On the other hand, the piston portion 83 has a pressing portion 84 that pushes the multi-plate clutch 7 at the inner diameter end of the inward flange portion 82A that extends inward in the radial direction on the multi-plate clutch 7 side of the substantially U-shaped portion 82 in cross section. .
[0042]
The pressing portion 84 extends toward the multi-plate clutch 7 by a predetermined length so as to push the multi-plate clutch 7 at its end when the piston portion 83 (metal ring 8) moves, and has a substantially U-shaped cross section. A plurality of inner circumferential ends of the inward flange portion 82A 82 are integrally provided in a plurality of equal numbers in the circumferential direction (see FIG. 1B).
[0043]
A return spring 15 as an urging means for urging the piston portion 83 (metal ring 8) toward the working side of the hydraulic pressure P as the fluid pressure from the passage 21 of the housing 2 is guided to the outer peripheral side of the pressing portion 84. Are arranged in four equal distributions (number and position in FIG. 2B) on the same circumference.
[0044]
A washer-like lower spring seat 16 is provided on the outer diameter side wall surface 31 at the opening end of the second annular hole 4 of the housing 2 to guide the lower part of the return spring 15, and its axial movement is stopped by a stopper 17. It is regulated.
[0045]
A return spring guide 18 is formed as a guide for the convex return spring 15 protruding in the axial direction from the inner diameter end of the inward flange portion 82A of the substantially U-shaped portion 82 in cross section. That is, the return spring guide 18 is formed integrally with the metal ring 8.
[0046]
That is, the return spring guide 18 is inserted into the upper inner peripheral portion of the return spring 15, the upper end surface of the return spring guide 18 abuts on the end surface of the inward flange portion 82 </ b> A, and the lower end surface abuts on the end surface of the lower spring seat 16. It is provided and urges the metal ring 8 toward the working side of the hydraulic pressure P.
[0047]
In the radial movement of the return spring 15, the upper part is regulated by a convex return spring guide 18, and the lower part is regulated by a projecting part 16 </ b> A that projects upward from the inner diameter end of the lower spring seat 16.
[0048]
In the above configuration, when the pressure chamber F is at a low pressure, the biasing force of the return spring 15 is applied to the piston portion 83 of the metal ring 8, and the end surface covering portion 11 is an opening through which the passage 21 of the housing 2 opens. It is in contact with the end face 22 and is stationary.
[0049]
When the hydraulic pressure P acts on the pressure chamber F via the passage 21 and the pressure rises, the piston portion 83 of the metal ring 8 resists the urging force of the return spring 15 in the direction of arrow C in FIG. The multi-plate clutch 7 is pushed at the end E of the pressing portion 84 of the metal ring 8 to transmit power.
[0050]
When releasing the transmission of power, the piston portion 83 is moved in the direction of arrow D in FIG. 1A by the urging force of the return spring 18. As a result, the original position is restored.
[0051]
In the sealing device having the above configuration, the return spring guide 8 of the return spring 15 that biases the metal ring 8 toward the working side of the hydraulic pressure P from the passage 21 of the housing 2 is integrally configured by the metal ring 8. Therefore, the return spring guide 18 is also made of metal and becomes strong, and the return spring 15 is not shifted from side to side or peeled up and down, and no crack is generated. From these, durability can be improved.
[0052]
Further, the return spring 15 as an urging means is fitted and fixed to a separate spring seat and not assembled to the metal ring 8 as in the prior art, and the interior of the return spring 15 is integrated with the metal ring 8. Since it only needs to be inserted into the convex return spring guide 18 constructed as described above, the assembly of the return spring 15 can be improved.
[0053]
Further, since the return spring guide 18 is formed integrally with the metal ring 8, there is no fitting portion with the metal ring 8. Therefore, the guide is not displaced due to wear, deformation or the like at the fitting portion between the guide and the metal ring during durability as in the prior art.
[0054]
Accordingly, it is possible to prevent the return spring 15 from being displaced or disengaged during the endurance and to stabilize the function.
[0055]
In addition, since the return spring guide 18 is not a separate member, the number of parts can be reduced as compared with the conventional case, and the manufacturing cost can be reduced.
[0056]
In the above-described embodiment, the guide of the return spring 15 as the biasing means has been described by taking a convex shape as an example. However, the guide is not limited to the convex shape, and as shown in FIG. An upper spring seat 18A having an annular recess into which the upper part of the return spring 15 is fitted may be provided integrally with the inner diameter end of the inward flange portion 82A by molding or the like. In this case, the assembling property is slightly inferior, but the guiding property is improved.
[0057]
【The invention's effect】
As described above, in the present invention, the guide of the urging means that urges the metal ring toward the fluid pressure acting side from the passage of the housing is integrally formed by the metal ring. The guide is also made of metal and becomes strong, and the biasing means does not shift to the left or right, or peels off when operated up and down, and does not crack. From these, durability can be improved.
[0058]
In addition, a conventional spring seat is not fitted to a metal ring after a spring as a biasing means is fitted and fixed to a separate spring seat, and the biasing means is integrated into a guide formed of a metal ring. Since it only needs to be attached, the assembling property of the urging means can be improved. As a result, the assembly of the apparatus can be improved.
[0059]
Furthermore, since the guide of the urging means is formed integrally with the metal ring, the guide and the metal ring do not have a fitting portion. Therefore, the guide is not displaced due to wear, deformation or the like at the fitting portion between the guide and the metal ring during durability as in the prior art.
[0060]
Therefore, it is possible to prevent the biasing means from being displaced or disengaged during the endurance, and the function can be stabilized.
[0061]
In addition, since the guide is not a separate member, the number of parts can be reduced as compared with the conventional case, and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 (a) is a half sectional view of a sealing device according to an embodiment of the present invention, and FIG. 1 (b) is a cutaway perspective view of a metal ring part of FIG. 1 (a); FIG. 3C is a cross-sectional view of the main part showing a return guide according to another aspect of the return guide.
FIG. 2A is a half sectional view of a conventional sealing device, and FIG. 2B is a plan view of an upper spring seat.
FIG. 3 is a plan view of an upper spring seat showing circular boss processing.
FIG. 4 is a cutaway perspective view of a metal ring portion of another conventional sealing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sleeve 2 Housing 21 Passage 22 Open end surface 3 Annular hole 31 Outer diameter side wall surface 32 Inner diameter side wall surface 4 Second annular hole 5 Annular recess 6 Holding member 61 Flat member 62 L-shaped member 7 Multi-plate clutch 8 Metal ring 81 Cross section L-shaped part 81A Pressure end wall 81B Cylindrical part 82 Cross section substantially U-shaped part 82A Inward flange part 83 Piston part 84 Pressing part 9 Inner peripheral seal lip (seal member)
10 Peripheral seal lip (seal member)
11, 13 End surface covering portions 12, 14 Outer periphery covering portion 15 Return spring (biasing means)
16 Lower spring seat 17 Stopper 18 Return spring guide (guide)
18A Upper spring seat (guide)

Claims (1)

A housing having an annular hole in which a piston portion for performing clutch switching of a shift switching device for an automatic transmission operates, and a passage communicating with the annular hole;
A metal ring that constitutes the piston portion that is movably inserted in the axial direction into the annular hole of the housing ;
The metal ring includes an L-shaped section having a pressure end wall capable of coming into contact with the radial surface of the annular hole, and a U-shaped section formed radially outward from the L-shaped section. An inner peripheral seal lip that is extended and integrally baked and fixed to the inner diameter end of the pressure end wall of the L-shaped portion, and is integrally baked to the corner on the opening end face side of the annular hole of the U-shaped portion. A fixed outer peripheral seal lip is provided integrally, and fluid pressure from the passage of the housing acts on the inner diameter end of the inward flange portion extending radially inward of the U-shaped portion on the multi-plate clutch side. A guide for guiding an urging means for urging the metal ring toward the side is provided, and a plurality of pressing portions for pressing the multi-plate clutch are formed in a circumferential direction, and the guide and the pressing portion are arranged in the metal ring. A sealing device characterized in that it is provided integrally with the sealing device and is positioned at substantially the same diameter .

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