JPH0667965U - Sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] Spring and cancel plate (sealing device)
Integrated, easy to manufacture with a simple structure, easy to handle,
To provide a lightweight and inexpensive sealing device. A cancel plate 1, which is a sealing device, forms an annular cavity 3 with a piston member 2 and seals it with a seal lip 12 to prevent sudden pressure fluctuations in the cavity 3, The member 2 is prevented from abruptly moving. Further, the cancel plate 1 is provided with an annular projection 11 which is a spring means and is engaged with the piston member 2 driven by the action of the pressure chamber 5, and when the pressure in the pressure chamber 5 increases, the piston member 2 In FIG. 1 (a), the skirt portion 22 shifts to the right to bring the clutch portion 6 into the engaged state,
When the piston member 2 is lowered, the annular projection 11, which is a spring device, acts, and the piston member 2 moves leftward in FIG.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device used for a piston portion of a fluid pressure cylinder for operating a clutch portion in an automatic transmission of an automobile, for example.

[0002]

[Prior art]

 As a clutch portion in an automatic transmission to which a conventional sealing device of this type is applied, for example, a structure shown in FIG. 7 is known.

That is, an annular cylinder member 107 that constitutes a driving means for performing the switching operation of the clutch portion 110, and is reciprocally inserted into the cylinder member 107 via O-rings 112 and 112 '. And an annular piston member 102.

The cylinder member 107 is connected to an input shaft of a transmission (not shown), and is connected to a member on the outlet side (not shown) via a clutch portion 110.

On the other hand, the piston member 102 includes a piston main body 108 facing a pressure chamber 109 into which a pressure fluid is introduced, and an entire circumference in the axial direction from the outer periphery of the piston main body 108 to the opposite side to the pressure chamber 109. And a skirt portion 111 that extends into the inner circumference of the cylinder member 107 and is in sliding contact with the outer diameter side wall surface of the inner periphery of the cylinder member 107.

The tip of the skirt portion 111 of the piston member 102 is in contact with the clutch portion 110 provided on the cylinder member 107, and the skirt portion of the piston member 102 is introduced by introducing pressure fluid into the pressure chamber 109. The clutch portion 110 is axially pressed via 111 to bring the clutch portion 110 into the engaged state.

An annular cancel plate 101 that constitutes a sealing device is arranged between the skirt portion 111 of the piston member 102 and the inner diameter side wall surface of the inner circumference of the cylinder member 107, and the cancel plate 101 and the piston An annular space 103 is formed between the member 102 and the member. The buffer action of the annular cavity 103 prevents the piston member 102 from abruptly moving.

As shown in FIG. 6, the cancel plate 101 is composed of a plate body 101a of a sheet metal structure obtained by plastically working a plate material, and a seal lip 104 integrally provided on the outer diameter end of the plate body 101a. As shown in FIG. 7, the inner diameter end of the plate body 101a is fixed to the inner diameter side wall surface of the inner circumference of the cylinder member 107.

On the other hand, the seal lip 104 on the outer diameter side is brought into close contact with the inner periphery of the skirt portion 111 of the piston member 102 to seal the gap between the plate body 101 a and the inner peripheral surface of the skirt portion 111 of the piston member 102. Make up part.

Further, a plurality of springs 105 for urging the piston member 102 toward the pressure chamber 109 side are provided between the cancel plate 101 and the piston member 102 in the circumferential direction, and when the pressure in the pressure chamber 109 is released, The skirt portion 111 is configured to be disengaged from the clutch portion 110.

Further, the cancel plate 101 is provided with a spring insertion groove 106 into which the plurality of springs 105 can be inserted and which is prevented from falling off.

[0012]

[Problems to be solved by the device]

 However, in the case of such a conventional technique, each of the plurality of springs 105 has to be inserted and assembled into the spring insertion groove 106 of the cancel plate 101, which makes the assembly cumbersome and heavy. It was

Further, it is necessary to form the spring insertion groove 106 corresponding to each spring 105 in the plate body 101a, the plate body 101a needs to have a complicated sheet metal structure, and it takes a lot of time to form.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a lightweight sealing device having a simple structure, requiring no assembly steps. It is in.

[0015]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, an annular cylinder member that constitutes a driving means for performing a switching operation of a clutch portion, and is reciprocally inserted into the cylinder member. An annular piston member, the piston member facing the pressure chamber into which the pressure fluid is introduced, and the piston member extending from the outer circumference of the piston body to the opposite side to the pressure chamber in the axial direction. A skirt portion extending in the direction of the inner circumference of the cylinder member and slidingly contacting the outer diameter side wall surface of the cylinder member, and an annular sealing device body is disposed between the skirt portion of the piston member and the inner diameter side wall surface of the cylinder member. A sealing device for forming an annular space between the sealing device body and the piston member, wherein the inner diameter end of the sealing device body is fixed to an inner diameter side wall surface of the inner circumference of the cylinder member, and the sealing is performed. On the outer diameter end side of the device body, A seal portion is provided to seal a gap between the outer diameter end of the sealing device body and the inner peripheral surface of the skirt portion, and the piston member is urged toward the pressure chamber between the sealing device body and the piston member. In a sealing device provided with spring means, a spring acting portion having elastic force in the axial direction is provided on the sealing device body itself, and the spring means constitutes the spring means, and the spring force of the spring acting portion is increased. It is characterized in that the piston member is biased by.

It is preferable that the spring action portion is configured by an elastic protrusion provided integrally with the sealing device body.

It is preferable that the main body of the sealing device is provided with a passage that connects the annular space and the outside.

The main body of the sealing device has a sheet metal structure in which a plate material is plastically processed, and the protrusion forming the spring means can also be formed by a plate spring integrally formed with the same plate material as the main body of the sealing device. .

[0019]

[Action]

 Thus, the piston member is biased toward the pressure chamber by the elastic protrusion integrally provided on the sealing device body.

Further, the pressure inside and outside the annular cavity is balanced through the passage provided in the main body of the sealing device.

Further, if the spring means is constituted by a leaf spring integrally formed with the same plate material as the main body of the sealing device, the structure is simple and easy to manufacture.

[0022]

【Example】

 The present invention will be described below based on the illustrated embodiment.

FIG. 1A is a cross-sectional structural view of the vicinity of a clutch portion of an automatic transmission to which the sealing device according to the first embodiment of the present invention is applied.

In the figure, A is a fluid pressure actuator for operating the clutch portion 6, which is arranged in an axial direction inside an annular cylinder member 4 and an annular cylinder chamber 8 formed in the cylinder member 4. And an annular piston member 2 which is reciprocally inserted.

The cylinder member 4 is connected to an input shaft of a transmission (not shown), and is connected to an output-side member (not shown) via a clutch portion 6 provided on the cylinder member 4.

The cylinder member 4 is an annular member having a U-shaped cross section, one end of which is closed and the other end of which is open. The inner cylinder portion 41 and an outer cylinder portion that is concentrically spaced from the inner cylinder portion 41 by a predetermined distance. 42, and an end wall 43 extending inward in the radial direction from one end of the outer tubular portion 42 and having an inner diameter end fixed to the inner tubular portion 41.

On the other hand, the piston member 2 includes an annular piston main body 21 and an outer peripheral side of the inner peripheral surface of the cylinder member 4 that extends from the outer periphery of the piston main body 21 to the open end side of the cylinder member 4 in the entire axial direction. The skirt portion 22 is in sliding contact with the inner circumference of the outer tubular portion 42 which is a wall surface.

A sliding surface is formed on the outer peripheral surface of the piston main body 21 which is in sliding contact with the inner peripheral surface of the outer cylindrical portion 42 of the cylinder member 4 and the inner peripheral surface of the piston main body 21 which is in sliding contact with the outer peripheral surface of the inner cylindrical portion 41 of the cylinder member 4. Sealing members 9 and 9 ′ such as O-rings for sealing the space are mounted, and a pressure chamber 5 into which a pressure fluid is introduced is formed between the piston member 2 and the end wall 43 of the cylinder member 4.

On the other hand, since the clutch portion 6 is provided on the release end side of the outer cylinder portion 42 of the cylinder member 4, the tip of the skirt portion 22 of the piston member 2 is engaged.

Although not shown in detail, the clutch section 6 is a known multi-plate clutch configuration in which clutch plates on the input side and clutch plates on the output side are alternately arranged in the axial direction. The clutch plate is connected to the outer cylinder portion 42 of the cylinder member 4, and the output side clutch plate is connected to an output side member (not shown).

Then, by introducing a pressure fluid into the pressure chamber 5, the piston member 2 is moved toward the clutch portion 6, and the skirt portion 22 presses the clutch portion 6 into a tightened state, from the input side. It is designed to transmit torque to the output side.

Between the inner circumference of the skirt portion 22 of the piston member 2 and the outer circumference of the inner cylinder portion 41 corresponding to the inner diameter side wall surface of the cylinder member 4, the annular cancel plate 1 which is the sealing device of the present invention is arranged. An annular space 3 is provided and is closed between the cancel plate 1 and the piston member 2.

The cancel plate 1 includes a plate body 10 as a sealing device body whose inner diameter end is fixed to the outer circumference of the inner cylindrical portion 41 forming the inner diameter side wall surface of the cylinder member 4, and the plate body 10 integrated with the plate body 10. It is composed of a seal lip 12 provided.

The seal lip 12 slidably sealingly contacts the inner peripheral surface of the skirt portion 22 to form the seal portion 7.

The plate body 10 is provided with an elastic annular projection 11 that projects toward the piston body 21.

The annular projection 11 is in contact with the end surface of the piston body 21 in a compressed state, and the elastic recovery force of the annular projection 11 constantly urges the piston body 21 toward the pressure chamber 5. .

In this embodiment, the plate body 10 of the cancel plate 1 has a sheet metal structure formed by plastically deforming a plate material, and is formed as a ring-shaped part having a substantially inverted L-shaped cross section.

The plate body 10 includes a washer-shaped plate portion 14 and a cylindrical portion 15 that extends axially from the outer diameter end of the plate portion 14 toward the piston body 21 by a predetermined width. And an inclined portion 16 extending from the tip of the cylindrical portion 15 toward the piston body 21 in the axial direction so that the diameter gradually becomes smaller, and a radial inward direction from the tip of the inclined portion 16. And an arc-shaped portion 17 that is bent back in an arc shape toward.

Of these, the plate portion 14 and the cylindrical portion 15 constitute the plate body 10, and the inclined portion 16 and the arc-shaped portion 17 constitute the annular projection 11.

The inner diameter end of the plate portion 14 is fitted to the outer circumference of the inner cylinder portion 41 of the cylinder member 4, and is fixed by the retaining ring 30.

Further, the plate portion 14 has a substantially flat and flat washer shape, and a rib 18 for reinforcement is provided in the middle thereof to enhance bending rigidity.

The rib 18 is formed to have a convex shape on the side opposite to the annular space 3.

Of course, the rib 18 is processed as needed and may be omitted if it is not necessary, and the shape thereof may be any shape as long as it can be reinforced.

Further, as shown in FIG. 3, a plurality of notches 13 are provided on the inner diameter end of the plate portion 14, and the notches 13 communicate the inside and the outside of the annular vacant chamber 3 to balance the pressure. It is designed to take

However, holes may be provided at appropriate places of the plate portion 14 instead of the notches.

Further, the axial position of the plate portion 14 is at a position where the piston main body 21 abuts on the end wall 43 of the cylinder member 4, and is positioned more than the tip of the skirt portion 22 so as not to interfere with the clutch portion 6. It is located slightly on the piston body 21 side.

On the other hand, the cylindrical portion 15 is arranged concentrically with the skirt portion 22, and an annular minute gap 7 a is formed between the outer periphery of the cylindrical portion 15 and the inner periphery of the skirt portion 22.

The length of the cylindrical portion 15 is slightly larger than half of the skirt portion 22 in this embodiment.

The seal lip 12 is joined to the outer periphery of the cylindrical portion 15.

The seal lip 12 is formed of a rubber-like elastic material, and includes a thin outer peripheral rubber portion 12 a that uniformly covers the entire outer peripheral surface of the cylindrical portion 15 and the outer peripheral surface of the cylindrical portion 15. And a lip portion 12b protruding outward in the radial direction.

The lip portion 12 b extends in a direction in which the diameter gradually increases toward the piston main body 21 side in the axial direction, and the tip end thereof has elasticity with respect to the inner peripheral surface of the skirt portion 22. Are pressed against each other to form the seal portion 7.

Further, the lip portion 12 b is provided so as to be offset toward the inclined portion 16 side of the cylindrical portion 15, and its base portion is located approximately at the center of the cylindrical portion 15 from the corner positions of the cylindrical portion 15 and the inclined portion 16. The width is set up to the central position, and the lip tip is located closer to the inclined portion 16 than the corners of the cylindrical portion 15 and the inclined portion 16.

The outer peripheral rubber portion 12 a that covers the outer peripheral surface of the cylindrical portion 15 also covers the corners between the plate portion 14 and the inclined portion 16.

On the other hand, in the illustrated example, the inclined portion 16 constitutes a part of the annular protruding portion 11 by being linearly inclined at an appropriate angle.

The arcuate portion 17 constitutes the annular projection 11 as spring means, which is continuous with the inclined portion 16 together with the inclined portion 16, and is formed in a convex shape on the piston body 21 side.

As shown in FIG. 1B, the arcuate portion 17 and the inclined portion 16 are provided with a plurality of notches 11 a extending in the axial direction.

The notches 11a are evenly arranged in the circumferential direction, and extend from the tip of the arcuate portion 17 to the middle position of the inclined portion 16, and are divided by the notches 11a and 11a. One piece functions as a highly elastic leaf spring.

Of course, the annular projection 11 may have elasticity as a spring in the axial direction, and the notch 11a may not be provided.

The cancel plate 1 as the sealing device having the above structure is inserted between the skirt portion 22 of the piston member 2 and the inner cylindrical portion 41 after the piston member 2 is inserted into the cylinder chamber 8 of the cylinder member 4. And then assembled.

When the cancel plate 1 is inserted, the inner end of the plate portion 14 is fitted to the outer circumference of the inner cylindrical portion 41 of the cylinder member 4 with the annular projection 11 facing forward, and the tip of the arc-shaped portion 17 is the piston. Push in axially until it abuts the back surface of body 21.

After abutting, a force is further applied in the axial direction to push it in to elastically deform the annular projection 11 in a certain amount in the axial direction, and the inner end of the plate portion 14 is fixed by the snap ring 30 at a predetermined position. .

Therefore, the piston body 21 is pressed against the end wall 43 of the cylinder member 4 by the elastic restoring force of the annular protrusion 11 with the inner end of the cancel plate 1 as a fulcrum.

In this way, by integrating the parts as the cancel plate 1 having the annular projection 11 which is the spring means, it is easy to handle, the number of assembling steps can be reduced, and the weight can be reduced by the weight of the plurality of conventional springs 105. Can be made lighter.

Further, the structure of the cancel plate 1 as the sealing device is simple and easy to manufacture.

Further, since the plurality of springs 105 can be eliminated, it is not necessary to provide a plurality of spring receiving portions as in the conventional piston member 102, and the piston member 2 can be easily manufactured.

In this embodiment, since the annular protrusion 11 is provided with the inclined portion 16 in the tapering direction, the inclined portion 16 serves as a guide for inserting the inner peripheral portion of the skirt portion 22, and the insertion operation. Can be done easily.

Next, the operation will be described. When a pressure fluid is introduced into the pressure chamber 5, the piston member 2 moves to the cancel plate 1 side against the pressing force of the annular projection 11 of the cancel plate 1.

As the piston member 2 moves, the annular projection 11 is elastically deformed mainly by bending the sloped portion 16 in the region where the notch 11a is formed, and hitting the rear face of the piston body 21 accordingly. The arcuate portion 17 in contact slides on the inner diameter side.

In this embodiment, since the contact surface is arcuate, it is easy to slip, and the frictional resistance is small, so that problems such as wear do not occur.

On the other hand, the annular cavity 3 is sealed by the lip portion 12b that is in close contact with the inner periphery of the skirt portion 22, and even if the pressure in the pressure chamber 5 suddenly increases, the annular cavity 3 prevents Buffered.

Furthermore, since the pressure inside and outside the annular cavity 3 is gradually balanced by the notch 13, the piston member 2 does not move suddenly.

In this embodiment, since the ribs 18 are provided on the plate portion 14 constituting the plate body 10 of the cancel plate 1 to enhance the bending rigidity, the piston member 2 moves and the inclined portion 16 is largely deformed. However, since the cylindrical portion 15 does not tilt, the contact state of the lip portion 12b with the skirt portion 22 can be appropriately maintained.

FIG. 4 shows a cancel plate 1 which is a sealing device according to a second embodiment of the present invention.

The cancel plate 1 includes the plate portion 14 and the cylindrical portion 15 (outer peripheral side) as one component, and the cylindrical portion 15 (inner peripheral side), the inclined portion 16 and the arc-shaped portion 17 as one component. The cylindrical portion 15 is joined to the outer peripheral lip portion 12b so that the movement of the arc-shaped portion 17, that is, the annular projection 2 having the spring mechanism is hard to be transmitted.

FIG. 5 shows a cancel plate 1 which is a sealing device according to a third embodiment of the present invention.

As in the second embodiment, the cancel plate 1 includes the plate portion 14 and the cylindrical portion 15 (outer peripheral side) as one component, and the cylindrical portion 15 (inner peripheral side), the inclined portion 16 and the arc shape. The portion 17 is formed by one part and is joined by the cylindrical portion 15, and a rubber layer 19 is provided at the joined portion so that the vibration of the annular protrusion 2 having the spring mechanism is further less likely to be transmitted to the lip portion 12b on the outer peripheral side. It is configured in.

[0077]

[Effect of device]

 The present invention has the above-described structure and operation, and since the elastic body has integrally formed a protrusion having elasticity to constitute the spring means for urging the piston member, the parts are integrated to form the spring and the spring. It is easier to handle than the separate technology of the prior art, and since it is not necessary to assemble multiple springs, the number of assembly steps is reduced and the weight can be further reduced.

Further, since it is not necessary to provide a spring insertion groove in the main body of the sealing device unlike the conventional case, the structure of the main body of the device can be simplified, and the manufacturing is easy and the cost is reduced.

Furthermore, by providing a passage in the sealing device body that connects the annular cavity with the outside, the internal and external pressures of the annular cavity are balanced, so that an excessive pressure is applied to the sealing device body. Not only that, the product life is extended and the quality is improved.

[Brief description of drawings]

FIG. 1A is a cross-sectional structural view showing the periphery of a sealing device according to a first embodiment of the present invention. FIG. 1B is a partial perspective view (partial cross section) showing a cancel plate which is a sealing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a cancel plate which is a sealing device according to a first embodiment of the present invention.

FIG. 3 is a partial view showing a notch at an inner diameter end of a cancel plate which is a sealing device according to first, second and third embodiments of the present invention.

FIG. 4 is a sectional view showing a cancel plate which is a sealing device according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a cancel plate which is a sealing device according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a cancel plate which is a conventional sealing device.

FIG. 7 is a sectional structural view showing the periphery of a conventional sealing device.

[Explanation of symbols]

 A fluid pressure actuator 1 cancellation plate (sealing device) 2 piston member 3 empty chamber 4 cylinder member 5 pressure chamber 6 clutch part 7 seal part 8 cylinder chamber 9, 9'seal member 10 plate body 11 annular projection part (spring means) 11a Notch 12 Seal lip 12a Outer peripheral rubber part 12b Lip part 13 Notch 14 Plate part 15 Cylindrical part 16 Inclined part 17 Arc part 18 Rib 19 Rubber layer 21 Piston body 22 Skirt part 30 Retaining ring 41 Inner cylinder part 42 Outer cylinder Part 43 End wall 101 Cancellation plate (sealing device) 101a Plate body 102 Piston member 103 Vacancy 104 Seal lip 105 Spring 106 Spring insertion groove 107 Cylinder member 108 Piston body 109 Pressure chamber 110 Clutch part 111 Skirt part 112,112 'O-ring

Claims (4)

[Scope of utility model registration request] 1. An annular cylinder member which constitutes a driving means for performing a switching operation of a clutch portion, and an annular piston member which is reciprocally inserted into the cylinder member.
The piston member has a piston body facing a pressure chamber into which a pressure fluid is introduced, and a piston body extending from the outer periphery of the piston body to the opposite side to the pressure chamber in the entire axial direction in the cylinder member. A skirt portion slidably contacting the outer diameter side wall surface of the circumference, and an annular sealing device body is disposed between the skirt portion of the piston member and the inner diameter side wall surface of the cylinder member, and the sealing device body and the piston A sealing device for forming an annular cavity between members, wherein the inner diameter end of the sealing device body is fixed to the inner diameter side wall surface of the inner circumference of the cylinder member, and the outer diameter end side of the sealing device body is, A seal portion is provided to seal a gap between the outer diameter end of the sealing device body and the inner peripheral surface of the skirt portion, and spring means for urging the piston member toward the pressure chamber between the sealing device body and the piston member. To the sealing device provided with The sealing device body itself is provided with a spring acting portion having an elastic force in the axial direction, the spring acting portion constitutes the spring means, and the piston member is biased by the spring force of the spring acting portion. A sealing device characterized by the above. 2. The sealing device according to claim 1, wherein the spring action portion is formed by an elastic protrusion provided integrally with the sealing device body. 3. The main body of the sealing device is provided with a passage that communicates the annular space with the outside.
Or the sealing device according to 2. 4. The sealing device main body has a sheet metal structure in which a plate material is plastically processed, and a protrusion forming a spring means is also formed by a plate spring integrally formed of the same plate material as the sealing device main body. The sealing device according to claim 2 or 3.