JPH09189335A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability and assemblage and stabilize function by integrally constituting a guide as an energizing means which energizes a metal ring to an action side of fluid pressure from a path of a housing. SOLUTION: A return spring guide 18 of a return spring 15 which energizes a metal ring 8 to the action side of hydraulic pressure (p) from a path 21 of a housing 2 is integrally constituted of the metal ring 8 and therefore the return spring guide 18 is strengthened so that the return spring 15 is eliminated from being deviated in the left/right, from being torn by vertical action, and from being cracked. This constitution can improve durability, The inside of the return spring 15 is just inserted into the projecting return spring guide 18, which is integrally constituted of the metal ring 8, so that the assemblage of the return spring 15 can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used for, for example, a piston portion for switching a clutch of a gear shift device of an automatic transmission for an automobile.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, for example, as shown in FIG. 2 (a), there is one used in a piston portion for switching operation of a clutch of a shift change device of an automatic transmission.

In the figure, reference numeral 100 denotes a sleeve to be mounted on 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.

Further, a multi-plate clutch 105 is provided on the outer peripheral side of the sleeve 101 via a holding member 104 mounted on the outer peripheral surface of the sleeve 100 at a predetermined axial distance from the housing 103, and the multi-plate clutch 105 is provided. Clutch 105
A metal ring 106 is arranged between the and the annular hole 101 so as to be movable in the axial direction.

The metal ring 106 has a piston portion 107 that is axially movable in the annular hole 101 and a pressing portion 108 that pushes the multi-plate clutch 105.

An annular hole 10 is formed on the inner and outer circumferences of the piston portion 107.
Seal lips 109 and 110 made of a rubber-like elastic body are provided as seal members slidably and slidably contacting the inner and outer peripheral surfaces of 1. As a result, the annular hole 101 and the piston portion 10
A pressure chamber D is formed at 7.

Further, an inward flange portion 111 extending inward in the radial direction is provided at an end portion of the piston portion 107 on the axial multi-plate clutch 105 side.
A pressing portion 108 extending toward the multi-plate clutch 105 side is provided at the inner diameter end of 11.

[0008] Then, the hydraulic pressure P acting on the pressure chamber G from the passage 102 of the housing 103 rises, so
The end portion H of the pressing portion 108 pushes the multi-plate clutch 105 via the piston portion 107 of No. 6 to transmit power.

In order to cancel the transmission of this power,
A plurality of return springs 112 are provided on the same circumference via a guide as biasing means for biasing the piston portion 107 toward the working side of the hydraulic pressure P so as to separate the pressing portion 108 from the multi-plate clutch 105.

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 near the multi-plate clutch 105, and its axial movement is restricted by a stopper 114. .

The upper spring seat 1 facing the lower spring seat 113 and serving as a guide for a washer-shaped return spring 112 as shown in FIG. 2B.
15 is provided on the end surface of the inward flange portion 111 of the piston portion 107.

That is, the return spring 112 is provided between the upper spring seat 115 and the lower spring seat 113, and the pressing portion 108 is separated from the multi-plate clutch 105 by the urging force of the return spring 112.
Power transmission is released and the metal ring 106 is returned to its original position.

Further, as a guide for the return spring 112, as shown in FIG. 4, there is a rubber projection 116 made of a rubber-like elastic body which is integrally formed with the seal lips 109, 110 provided on the inner and outer circumferences of the piston portion 107. The rubber protrusion 116 is guided by the inner peripheral portion of the return spring 112.

[0014]

However, the guide of the return spring 112 is provided with the rubber protrusion 116.
In such a case, there is a drawback in that the return spring 112 is displaced leftward or rightward or is vertically moved, so that the return spring 112 is peeled off and a crack is generated, resulting in poor durability.

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. 2 (b) and 3, for example. The outer diameter B of the circular boss 117 is made slightly larger than the inner diameter A of the return spring 112 so that the return springs 112 are fitted one by one with a tightening allowance, so that the assembling property is deteriorated. There was a flaw.

A return spring 1 having a spring property is provided.
Since it is 12, it cannot be done by mechanical pushing, and it is almost manually assembled.

During the durability, the upper spring seat 11
5 and the fitting portion of the inward flange portion 111 of the piston portion 107 due to wear, deformation, etc., the upper spring seat 115.
Since the deviation of the return spring 112 occurs, the return spring 112 is easily deviated from the deviation, and it is difficult to maintain the stable function.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The object of the present invention is to improve durability and assemblability and to stabilize the function. To provide a sealing device.

[0019]

In order to achieve the above object, in the present invention, a housing having an annular hole and a passage communicating with the annular hole, and axially movable in the annular hole of the housing. A metal ring inserted into the housing, a seal member for sealing the inner and outer circumferences of the metal ring and the inner and outer peripheral surfaces of the annular hole of the housing, and urging the metal ring toward the side of the fluid pressure acting from the passage of the housing. In the sealing device including the biasing means and the guide of the biasing means, the guide of the biasing means is integrally formed by the metal ring.

In the sealing device having the above-described structure, the guide of the biasing means for biasing the metal ring toward the working side of the fluid pressure from the passage of the housing is integrally formed by the metal ring. Therefore, since the guide is also made of metal and is strong, the biasing means does not shift to the left or right, peels off due to vertical movement, and cracks do not occur. From these, durability is improved.

Further, unlike the prior art, it is not necessary to fit and fix a spring as a biasing means to a separate spring seat and then assemble it to a metal ring, and the biasing means is integrally formed by the metal ring. Since it only needs to be attached to the guide, the assembling property of the biasing means is improved.

Further, since the guide of the urging means is integrally formed of the metal ring, the guide and the metal ring do not have a fitting portion. Therefore, unlike the conventional case, the guide is not displaced during wear due to wear or deformation of the fitting portion between the guide and the metal ring.

Therefore, the deviation of the biasing means during the durability,
It is possible to prevent the detachment and stabilize the function.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

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 in a piston portion of an automatic transmission such as an automobile as in the conventional case.

In the figure, reference numeral 1 is a sleeve, and the sleeve 1 is mounted on a rotary shaft (not shown). A housing 2 is attached to the outer peripheral surface above the sleeve 1.

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 portion.
An annular hole 4 is formed. Further, the inner diameter side wall surface 32 extends upward and has an annular recess 5 on the inner peripheral side of the passage 21.

On the outer peripheral side of the sleeve 1 below the second annular hole 4, a multi-plate clutch 7 is provided via a holding member 6 attached to the outer peripheral surface of the sleeve 1 so as to face the second annular hole 4.

The holding member 6 has a flat flat member 61 for holding the axial end portion of the multi-plate clutch 7 and a cross section for holding the inner peripheral portion of the multi-plate clutch 7 mounted on the upper surface of the flat member 61. An L-shaped member 62 having an L-shape is provided, and the multi-plate clutch 7 is provided on the outer peripheral side of the L-shaped member 62 and on the upper surface of the flat member 61.

A metal ring 8 is inserted in the annular hole 3 so as to be movable in the axial direction, and rubber-like elasticity as a sealing member for sealing between the inner and outer circumferences of the metal ring 8 and the inner and outer peripheral surfaces of the annular hole 3. Body sealing lips 9, 10 are provided.

The metal ring 8 has an L-shaped section 81 located on the inner diameter side of the annular hole 3 and a substantially U-shaped section 8 located on the outer diameter side.
2 has a piston portion 83 and a pressing portion 84 that extends from the inner diameter end of the substantially U-shaped section 82 toward the multi-plate clutch 7 by a predetermined length and presses the multi-plate clutch 7.

The L-shaped section 81 has a washer-shaped pressure end wall 81 facing the open end surface 22 of the passage 21 of the housing 2.
A and a cylindrical portion 81B extending axially from the outer diameter end portion of the pressure end wall 81A toward the multi-plate clutch 7 side. A substantially U-shaped section 82 is provided at the outer diameter end of the cylindrical section 81B so as to open inward in the radial direction.

The inner 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.

The inner peripheral seal lip 9 is inclined so as to extend toward the annular recess 5 side of the axial housing 2 and open inward in the radial direction, and the lip tip is located on the inner diameter side wall surface 32 of the annular hole 3. Sliding freely in sealed contact.

The outer peripheral seal lip 10 has a substantially U-shaped cross section.
The character-shaped portion 82 is integrally baked and fixed to the corner of the annular hole 3 on the side of the opening end face 22.

The outer peripheral seal lip 10 is inclined so as to extend toward the axial opening end face 22 side and open outward in the radial direction, and the lip tip is slidable on the outer diameter side wall face 31 of the annular hole 3. Is in sealed contact with.

In this way, the piston portion 8 of the metal ring 8 is inserted through the inner peripheral seal lip 9 and the outer peripheral seal lip 10.
A pressure chamber F is formed between the ring 3 and the annular hole 3 of the housing 2.

Further, the pressure end wall 81 of the L-shaped section 81 is formed.
The end surface of A and the outer peripheral surface of the cylindrical portion 81B are entirely covered with the end surface and the outer peripheral covering portions 11 and 12 made of a rubber-like elastic material, and the end surface and the outer periphery of the opening end surface 22 of the substantially U-shaped section 82 in cross section. The entire surface is covered with the end surface and the outer peripheral covering portions 13 and 14 made of a rubber-like elastic material.

From these, the inner peripheral seal lip 9 and the outer peripheral seal lip 10 are connected to the end faces of the L-shaped section 81 and the substantially U-shaped section 82 and the inner peripheral coating sections 11, 13, 12, 14 respectively.
It is integrally molded with.

Then, the end surface covering portion 11 of the L-shaped section 81 in cross section abuts the opening end surface 22 of the annular hole 3 to position the metal ring 8 in the axial direction.

On the other hand, the substantially U-shaped section 8 of the piston section 83
A pressing portion 84 that pushes the multi-plate clutch 7 is provided 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.

The pushing portion 84 extends toward the multi-disc clutch 7 side by a predetermined length so that the end of the pushing portion 84 pushes the multi-disc clutch 7 when the piston portion 83 (metal ring 8) is moved, and the cross section is substantially U. The inward flange portion 82A of the character-shaped portion 82 is integrally provided at the inner diameter end in a plurality of equal intervals in the circumferential direction (see FIG. 1B).

On the outer peripheral side of the pressing portion 84, the housing 2
A plurality of return springs 15 as biasing means for biasing the piston portion 83 (metal ring 8) toward the working side of the hydraulic pressure P as the fluid pressure from the passage 21 are provided on the same circumference through the guide. They are evenly arranged (see FIG. 2B for the number and position).

A washer-shaped lower spring seat 16 for guiding the lower portion of the return spring 15 is provided on the outer diameter side wall surface 31 of the opening end portion of the second annular hole 4 of the housing 2, and the axial movement thereof. It is regulated by the stopper 17.

A return spring guide 18 is formed as a guide for the convex return spring 15 projecting in the axial direction from the inner diameter end of the inward flange portion 82A of the substantially U-shaped section 82. That is, the return spring guide 18 is integrally configured by the metal ring 8.

That is, the return spring guide 18 is inserted into the inner peripheral portion of the upper portion of the return spring 15, and the upper end face of the return spring 15 contacts the end face of the inward flange portion 82A, and the lower end face of the return spring seat 16 contacts the end face of the lower spring seat 16. A spring 15 is provided to urge the metal ring 8 toward the working side of the hydraulic pressure P.

In the radial movement of the return spring 15, the upper part is restricted by the convex return spring guide 18, and the lower part is restricted by the protruding part 16A protruding upward from the inner diameter end of the lower spring seat 16.

In the above structure, when the pressure chamber F is at a low pressure, the urging force of the return spring 15 is applied to the piston portion 83 of the metal ring 8 and the end face coating portion 1 thereof is provided.
1 contacts the open end surface 22 of the housing 2 where the passage 21 opens, and stands still.

Further, the hydraulic pressure P is supplied to the pressure chamber F through the passage 21.
When the pressure acts on the piston 8 of the metal ring 8,
3 against the biasing force of the return spring 15
(A) Move in the direction of the middle arrow C and push the multi-plate clutch 7 at the end E of the pressing portion 84 of the metal ring 8 to transmit power.

When the transmission of power is released, 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.

In the sealing device having the above structure, the metal ring 8 is directed toward the working side of the hydraulic pressure P from the passage 21 of the housing 2.
Since the return spring guide 8 of the return spring 15 that biases the
The return spring guide 18 is also made of metal and is strong, so that the return spring 15 does not shift to the left or right, peels off due to vertical movement, and cracks do not occur. From these, durability can be improved.

Further, unlike the prior art, it is not necessary to fit and fix the return spring 15 as the urging means to the separate spring seat, and then to assemble the return spring 15 into the metal ring 8. Since it is only necessary to insert it into the convex return spring guide 18 that is integrally configured as a single unit, the assembling property of the return spring 15 can be improved.

Further, since the return spring guide 18 is formed integrally with the metal ring 8, it does not have a fitting portion with the metal ring 8. Therefore, unlike the conventional case, the guide is not displaced during wear due to wear or deformation of the fitting portion between the guide and the metal ring.

Therefore, it is possible to prevent the return spring 15 from being displaced and disengaged during the durability, and to stabilize the function.

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 one, and the manufacturing cost can be reduced.

In the above embodiment, the guide of the return spring 15 as the urging means is described as a convex guide, but the guide is not limited to a convex guide, and as shown in FIG. Upper spring seat 1 having an annular recess into which the upper portion of the return spring 15 shown in FIG.
8A may be integrally provided on 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 guide property is improved.

[0057]

As described above, according to the present invention, the guide of the biasing means for biasing the metal ring toward the working side of the fluid pressure from the passage of the housing is integrally formed by the metal ring. Since it is configured, the guide is also made of metal and is strong, and the urging means does not shift to the left or right, peels due to vertical movement, and cracks do not occur. From these, durability can be improved.

Further, unlike the prior art, it is not necessary to fit and fix the spring as the urging means to the separate spring seat and then assemble it to the metal ring, and the urging means is integrally formed by the metal ring. Since it is only necessary to mount it on the guide, it is possible to improve the assembling property of the biasing means. As a result, the assemblability of the device can be improved.

Further, since the guide of the urging means is integrally formed of the metal ring, the guide and the metal ring do not have a fitting portion. Therefore, unlike the conventional case, the guide is not displaced during wear due to wear or deformation of the fitting portion between the guide and the metal ring.

Therefore, during the endurance, the biasing means is displaced,
It is possible to prevent the detachment and stabilize the function.

In addition, since the guide is not a separate member,
The number of parts can be reduced as compared with the conventional one, and the manufacturing cost can be reduced.

[Brief description of the drawings]

1 (a) is a half sectional view of a sealing device according to an embodiment of the present invention, FIG. 1 (b) is a cutaway perspective view of a metal ring portion of FIG. 1 (a), FIG. 7C is a sectional view of a main part showing a return guide in another mode 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 opening end face 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-disc clutch 8 metal ring 81 cross section L-shaped portion 81A Pressure end wall 81B Cylindrical portion 82 Sectional U-shaped portion 82A Inward flange portion 83 Piston portion 84 Pressing portion 9 Inner peripheral seal lip (seal member) 10 Outer peripheral seal lip (seal member) 11, 13 End surface coating Part 12, 14 Outer circumference covering part 15 Return spring (biasing means) 16 Lower spring seat 17 Stopper 18 Return spring guide (guide) 18A Upper spring seat (guide)

Claims (1)

[Claims] 1. A housing having an annular hole and a passage communicating with the annular hole, a metal ring inserted axially movably into the annular hole of the housing, an inner and outer circumference of the metal ring, and an annular hole of the housing. A seal member for sealing the inner and outer peripheral surfaces,
A sealing device comprising: a biasing means for biasing the metal ring toward a side of a fluid pressure acting from a passage of the housing; and a guide of the biasing means, wherein the guide of the biasing means is the metal ring. A sealing device characterized in that it is integrally configured with.