JP2000320688A - Annular member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the rigidity of an annular member, prevent the internal fracture of a seal lip, and improve the durability by integrally forming a cylinder part axially extended from a fixing part of a body in the annular member having the seal lip in the outer circumferential side of the body and the fixing part in the internal circumferential side of the body. SOLUTION: A cancel plate 1 as an annular regulating member which is provided in the outer circumference of a shaft 101 in an automatic transmission and regulates the axial movement is arranged in an annular clearance between a housing 100 and the shaft 101 rotating relatively and is a disc member formed of a metal plate by press working. A body 1a is provided with a seal lip 1b slidingly abutting on the circumferential wall face of the housing 100 in its outer circumferential side and a fixing part 1c for supported to the shaft 101 in its internal circumferential side, and integrally defines a cylindrical part 1d axially extended from the fixing part 1c. The axial movement of the fixing part 1c is regulated by a stopper 106 fitted in a groove of the shaft 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annular member having a seal lip, and more particularly to a technique for suppressing rigidity UP and internal damage of the seal lip.

[0002]

2. Description of the Related Art In a shift changeover portion of an automatic transmission used in an automobile or the like, a multi-plate clutch is controlled by a pressing force of a piston member which is moved by applying hydraulic pressure in a rotating state, thereby performing shift control. There is something that is being done.

FIG. 3 shows a schematic configuration of the speed changeover section.
A brief description will be given. FIG. 3 shows a cross-sectional configuration of only one side of the rotation axis R1 according to a customary manner (the opposite side of the rotation axis R1 has a symmetric structure). In the figure, reference numeral 100 denotes a housing into which a shaft 101 serving as a rotating shaft is inserted. An inner peripheral surface of the housing 100 and an outer peripheral surface of the shaft 101 form an annular piston chamber 102.

[0004] A multi-plate clutch 103 is provided inside the housing 100, and a piston member 104 having a bottomed cylindrical shape is arranged in the piston chamber 102 so as to be able to stroke in the axial direction. A cancel plate 105 is attached to the outer periphery of the shaft 101 as an annular restricting member that restricts axial movement. The cancel plate 105 has a protrusion 105a near the inner periphery, and a shaft 101 is provided on the inner periphery side of the protrusion 105a.
The stopper 106 provided at the position is positioned to restrict the movement in the axial direction.

A seal lip 107 as a seal member is provided on the outer peripheral surface of the cancel plate 105, and the seal lip 107 is in sealing contact with the inner peripheral surface of the outer cylindrical portion 104 a of the piston member 104.

[0006] Between the cancel plate 105 and the piston member 104, a plurality of coil springs 108 for urging the piston member 104 in a direction away from the cancel plate 105 are arranged in the circumferential direction.

[0007] The piston member 104 urged by the spring 108 is connected to the end face 100 of the housing 100.
a through the rubber-like elastic body 110 and comes to rest.

A seal lip is provided on the outer periphery of the piston member 104 as a seal member for sealingly contacting the outer peripheral surface of the shaft 101 forming the piston chamber 102 and the inner peripheral surface of the housing 100. 111,
112 are provided.

In this manner, the pressure chamber X and the oil chambers Y and Z are separately formed in the housing 100.

In the above configuration, when the hydraulic pressure (arrow P) acts on the pressure chamber X and the pressure rises, the piston member 104
Strokes toward the cancel plate 105 side (downward in the figure) against the urging force of the spring 108, and presses the multi-plate clutch 103 at the end of the outer cylindrical portion 104a of the piston member 104 to connect the power. Do.

When the transmission of power by the multi-plate clutch 103 is released, the pressure in the pressure chamber X is lowered,
By supplying the oil to the oil chamber Y, the piston member 104 is caused to stroke toward the end face 100 a of the housing 100 by the urging force of the spring 108.

As described above, the piston member 104 and the cancel plate 105 rotate and move in the axial direction by receiving the hydraulic pressure, and the seal lip 107 and the seal lips 111 and 112 are integrally formed with the base material. It functions as a so-called bonded piston seal (BPS).

[0013]

In the speed changeover portion having such a structure, focusing on the cancel plate 105,
The load stress applied to the cancel plate 105 is the set load of the coil spring 108 and the oil pressure of the oil present in the oil chamber Y.

The hydraulic pressure is, as shown in FIG.
Due to the high-speed rotation of the actual machine, the internal oil becomes centrifugal oil pressure toward the outer peripheral side, and a greater pressure is applied on the outer peripheral side as the rotational speed increases.

When an excessive load stress is applied to the cancel plate 105, a bending deformation as shown in FIG. 4B occurs, and the contact state of the seal lip 107 changes (the surface pressure increases), thereby causing the sliding. There is a concern that operating characteristics may change due to an increase in resistance. Further, there is a concern that the internal plate fitting portion 105b on the shaft 101 may be damaged by the internal stress of σmax due to excessive internal stress.

In order to prevent the bending deformation of the cancel plate 105, a method of increasing the strength by changing the material of the cancel plate 105 and a method of increasing the strength by increasing the thickness of the cancel plate 105 can be considered. I will.

Further, as shown in FIG. 4C, the presence of an edge on the outer peripheral end face 105c of the cancel plate 105 causes the stress inside the seal lip 107 when a hydraulic pressure (small arrow in the figure) is applied. Concentration is likely to occur, and there is a concern that pressure resistance and durability are affected. At the time of molding the seal lip 107, adhesion of the adhesive to the edge is poor, and it is desired to improve the adhesion between the cancel plate 105 and the molded portion of the seal lip 107.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to increase the rigidity of an annular member receiving a pressure by providing a seal lip, and to join the annular member to the annular member. To prevent internal damage to the seal lip and improve pressure resistance and durability.

[0019]

In order to achieve the above object, according to the present invention, there is provided a housing which is disposed in an annular gap between a relatively rotating housing and a shaft, and is provided on an outer peripheral side of a main body formed of a plate-like member. An annular member having a seal lip slidably in contact with a peripheral wall surface of the main body and a fixing portion supported on the shaft on the inner peripheral side of the main body, and extending in the axial direction from the fixing portion of the main body. It is characterized in that the cylindrical portion is formed integrally.

According to this structure, the rigidity of the main body formed of the plate-like member by the cylindrical portion can be increased, and the same effect as substantially increasing the thickness of the main body can be obtained. Accordingly, it is possible to improve the durability life against breakage by relaxing the internal stress, and suppress the increase in the sliding resistance of the seal lip due to the suppression of the bending deformation, thereby obtaining good operating characteristics.

It is also preferable to provide a radius on the outer peripheral edge of the main body on which the seal lip is provided, thereby suppressing the concentration of stress inside the seal lip and contributing to the improvement of adhesiveness when forming the seal lip. I do.

[0022]

FIG. 1 is a view for explaining the structure of a cancel plate 1 as an annular member according to an embodiment.

The cancel plate 1 can be used as a substitute for the cancel plate 105 in the transmission shown in FIG. In FIG. 1, components other than the cancel plate 1 are the same as those in FIG. 3, and the same components are denoted by the same reference numerals.

The cancel plate 1 is disposed in an annular gap between the relatively rotating housing 100 and the shaft 101,
It is a disk-shaped member formed by pressing a metal plate material. A seal lip 1b slidably in contact with a peripheral wall surface of the housing 100 is provided on an outer peripheral side of the main body 1a, and a fixed portion 1c for being supported by the shaft 101 is provided on an inner peripheral side of the main body 1a. The extending cylindrical portion 1d is integrally formed. The movement of the fixed portion 1c in the axial direction is restricted by the stopper 106 fitted in the groove of the shaft 101.

With such a configuration, the cylindrical portion 1
By d, the rigidity of the main body 1a formed from the plate-like member can be increased, and the same effect as substantially increasing the thickness of the main body 1a can be obtained. Accordingly, it is possible to improve the durability life against breakage by relaxing the internal stress particularly near the fixing portion 1c, and to suppress the increase in the sliding resistance of the seal lip 1b due to the suppression of the bending deformation, thereby obtaining good operating characteristics.

Further, a radius 1e is formed on an outer peripheral edge 1f of the main body 1a on which the seal lip 1b is provided, thereby suppressing stress concentration inside the seal lip 1b and improving the adhesiveness when the seal lip 1b is formed. Can be planned.

Various details can be applied to the radius 1e. For example, as shown in FIG. 2, a normal radius chamfering shape (the radius 1eA in FIG. 2 (a)), a daleal often seen in press molding. It is possible to apply a shape (R 1 eB in FIG. 2B), a shape in which the R protrudes toward the R forming surface side (R 1 eC in FIG. 2C), and the like.

It is considered that R0.2 to R2.5 is an effective range of the radius. At R0.2 or less, the effect of stress relaxation is small, and at R2.5 or more, the deformation of the seal lip becomes large with respect to the oil pressure, and the stress of the seal lip tends to increase.

[0029]

As described above, in the annular member to which the present invention is applied, the rigidity of the main body formed from the plate-like member by the cylindrical portion can be increased, and the thickness of the main body can be substantially increased. The same effect as described above can be obtained. Accordingly, it is possible to improve the durability life against breakage by relaxing the internal stress, and suppress the increase in the sliding resistance of the seal lip due to the suppression of the bending deformation, thereby obtaining good operating characteristics.

Further, by providing a radius on the outer peripheral edge of the main body where the seal lip is provided, concentration of stress inside the seal lip is suppressed, and the adhesiveness at the time of forming the seal lip is also contributed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a cross-sectional configuration of an annular member according to an embodiment.

FIG. 2 is a diagram illustrating a shape of a round according to the embodiment.

FIG. 3 is an explanatory diagram of a configuration of a speed changeover unit using an annular member.

FIG. 4 is a view for explaining a problem of an annular member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cancel plate 1a Main body 1b Seal lip 1c Fixed part 1d Cylindrical part 1e R 1f Edge 100 Housing 101 Axis 106 Stopper

Claims (2)

[Claims] A seal lip disposed in an annular gap between a relatively rotating housing and a shaft, and slidably in contact with a peripheral wall surface of the housing on an outer peripheral side of a main body formed of a plate-shaped member;
A fixing portion for being supported by the shaft on the inner peripheral side of the main body,
An annular member comprising: a cylindrical portion integrally extending from a fixing portion of the main body in an axial direction. 2. The annular member according to claim 1, wherein a radius is provided at an outer peripheral edge of the main body on which the seal lip is provided.