JP2020076432A - Sealing device - Google Patents

Abstract

To provide a sealing device which can easily assemble a spring member at a correct position on a plate member with a simple and low-cost structure.SOLUTION: A sealing device includes: a piston 10; a plurality of spring members 30 that urges the piston 10; a plate member 40 that supports the end of the spring member 30 and forms a low-pressure oil chamber P2 for oil pressure adjustment; and a seam member 41 provided on an outer periphery of the plate member 40 and sealing the low-pressure oik chamber P2. The plate member 40 includes a bottom part 40c that faces the piston 10 and a cylindrical part 40d standing from the outer periphery in the piston direction. Positioning means 42 is provided to the bottom part 40c which determines a position for supporting the end of the spring member 30. A curved-surface recess groove 44 is provided on the cylindrical part 40d which is shaped to correspond to an outer peripheral shape of the spring member 30. When viewed in an extension direction of an axial line X, the spring member 30 is provided over a virtual circle in the cylindrical part 40c between the closest part 45 to the axial line X and positioned away from the cylindrical part 40d.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device, and more specifically, supports a spring member that urges a hydraulic piston of an automatic transmission (AT (Automatic Transmission), CVT (Continuously Variable Transmission), etc.) for vehicles such as automobiles, The present invention relates to a sealing device used to reduce the influence of centrifugal oil pressure acting on the hydraulic piston.

  BACKGROUND ART Conventionally, a sealing device for a clutch piston mechanism (hereinafter, also referred to as a "piston mechanism") used in an automatic transmission of a vehicle such as an automobile includes a bonded piston seal, a canceller seal, and a bonded piston seal and a canceller seal. It is equipped with a return spring provided between and.

  The bonded piston seal is a rubber lip cross-linking adhesive type piston seal used for fastening a multi-plate clutch provided inside a cylindrical clutch housing (hereinafter, also referred to as “housing”). In the following description, the bonded piston seal is also called a piston seal.

  The piston seal is generally made of a metal ring that operates (reciprocates) in the axial direction of the housing in accordance with the hydraulic pressure of the hydraulic oil supplied to the housing in order to engage or disengage the multiple disc clutch of the automatic transmission. , A seal lip integrally formed with the metal ring.

  A piston hydraulic chamber is formed between the inner peripheral surface of the housing in which the piston seal is mounted and the piston seal, and hydraulic oil is supplied to the piston hydraulic chamber through an oil hole formed in the housing. ..

  The piston seal moves in the axial direction while sliding on the inner peripheral surface of the housing in accordance with the hydraulic pressure supplied by the hydraulic oil, and the forward movement in which the clutch plate is fastened by the flange-shaped pressing member provided in the piston seal. When the supply hydraulic pressure is released, the return operation of moving the pressing member away from the clutch plate and returning to the original reference position by the urging force of the return spring is repeated (for example, see Patent Document 1).

JP, 2006-242311, A JP-A-2002-372073

  In order to properly transmit the urging force of the return spring to the piston seal when the hydraulic pressure is released, it is necessary to install the return spring properly so that eccentricity does not occur. Some guide for positioning is provided.

  The characteristics required for this guide include ease of assembly and manufacturing cost in addition to the guide property. As the most common guide, there is a structure in which a part called a retainer that connects the coils to each other is provided at both ends of the return spring, but this increases the manufacturing cost.

  Also, to reduce costs, a retainer is provided only on the piston seal side, and on the canceller seal side, a wall guide adjacent to the return spring is recessed into a shape corresponding to the peripheral surface shape of the return spring, a so-called petal-shaped spring guide. Is disclosed, and a structure in which a return spring is directly abutted on and supported by this is disclosed (see Patent Document 2). However, with this method, although positioning on the canceller seal side is easy, since the peripheral surface of the return spring is in contact with the wall surface of the canceller seal, the movement of the return spring is limited and the responsiveness is affected. May give.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a spring member (return spring) at a correct position of a plate member (canceller seal) while having a simple and low-cost structure. An object of the present invention is to provide a sealing device that can be easily assembled.

  The above object is achieved by the present invention described below. That is, the sealing device of the present invention includes a piston, a plurality of coil-shaped spring members that bias the piston toward the high-pressure oil chamber along the axis, and a biasing side of the spring member toward the piston. A plate member supporting an end portion on the opposite side and forming a low pressure oil chamber for adjusting hydraulic pressure on the side opposite to the high pressure oil chamber side of the piston, and the low pressure oil provided on the outer peripheral portion of the plate member. A sealing device including a sealing member for sealing a chamber, wherein the plate member includes a bottom portion facing the piston, and a tubular portion rising from the outer edge of the bottom portion in the piston direction, Is provided with positioning means for determining a position for supporting the end portion of each of the spring members, and the cylindrical portion is provided with a curved groove having a shape corresponding to the outer peripheral shape of each of the spring members. When viewed from the extension direction of the axis, the spring member straddles a virtual circle that connects a portion of the tubular portion closest to the axis, and is located at a position separated from the tubular portion.

  In the sealing device of the present invention, it is preferable that the spring member is separated from the tubular portion even in the most compressed state.

  Further, as the sealing device of the present invention, the positioning region viewed from the extension direction of the axis in which the end portion of the spring member can be positioned when regulated by the positioning means is the piston in the axial direction. Side to the plate member side, the positioning means is configured so as to be gradually narrowed as the end portion of the spring member advances, and finally reach the target position, and the most when the positioning means regulates the positioning means. It is preferable that the wide positioning region includes a wall surface of the curved groove in the region.

  On the other hand, in the sealing device of the present invention, the positioning means may be a protrusion protruding from the bottom and fitted into the opening of the end of the spring member.

  Further, in the sealing device of the present invention, the positioning means may be a recess in which the bottom portion is depressed and the end portion of the spring member is fitted.

  According to the present invention, it is possible to provide a sealing device which has a simple and low-cost structure and which can easily assemble the spring member to the correct position of the plate member.

It is a fragmentary sectional view in the section which meets the axis which shows the state where the sealing device concerning the embodiment of the present invention was attached to the housing of the transmission. It is the top view which shows the structure when the sealing device concerning embodiment of this invention is seen from a housing | casing side, and sectional drawing in the cross section along an axis line. In the sealing device according to the embodiment of the present invention, a return spring and a canceller seal are extracted and enlarged, (a) is a partially enlarged plan view, and (b) is a partially enlarged cross-sectional view in a cross section along an axis. It is a schematic cross section in a cross section along an axis for explaining the physical relationship of a convex part, an end of a return spring, and an outer peripheral side cylinder at the time of assembling a sealing device concerning an embodiment of the present invention. FIG. 9 is a schematic cross-sectional view in a cross-section along the axis for explaining the positional relationship between the recess, the end portion of the return spring, and the outer peripheral side cylinder portion when the sealing device is assembled when the positioning means is the recess.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. Here, for convenience of description, in FIGS. 1 and 2, the radial direction of the piston 3 in the sealing device 1 is the arrow ab direction, and the outer peripheral side is the outer peripheral side of the piston 3, that is, the arrow a direction. The inner peripheral side is the inner peripheral side of the piston 3, that is, the direction of the arrow b. Further, the case side is defined as an arrow c direction orthogonal to the radial direction of the piston 3 (arrow ab direction). The multi-disc clutch side is an arrow d direction orthogonal to the radial direction of the piston 3 (arrow ab direction). The axis x is the center of rotation of the drive shaft (not shown) and the housing 2.

  As shown in FIGS. 1 and 2, the sealing device 1 is mounted inside a housing 101 of the transmission. The sealing device 1 includes a piston seal (piston) 10, an elastic body portion 20 integrated with the piston seal 10, a return spring (spring member) 30, and a canceller seal (plate member) 40.

  The piston seal 10 is an annular member made of metal centered on the axis x of the housing 101. A piston hydraulic chamber (high pressure oil chamber) P1 is formed between the piston seal 10 and the inner peripheral surface 101a of the housing 101. An oil hole 101b communicating with the piston hydraulic chamber P1 is formed on the inner peripheral surface 101a of the housing 101. In this case, the oil hole 101b is formed at the end of the inner peripheral surface 101a of the housing 101 on the inner peripheral side (direction of arrow b).

  The piston seal 10 slides on the inner peripheral surface 101 a of the housing 101 along the axis line x in accordance with the hydraulic pressure of hydraulic oil such as ATF (Automatic Transmission Fluid) supplied through the oil hole 101 b of the housing 101. While moving relative to the housing 101.

  The piston seal 10 is attached to the inner peripheral surface 101a of the housing 101 together with the elastic body portion 20, and is rotated together with the rotation of the housing 101. The metal material of the piston seal 10 includes stainless steel, SPCC (cold rolled steel), etc., and is mainly SPFH (hot rolled steel) and SAPH (hot rolled steel). The piston seal 10 is manufactured by, for example, press working or forging.

  The piston seal 10 includes an inner peripheral side jaw 10a, an innermost peripheral side cylindrical portion 10b, an innermost peripheral side annular portion 10c, a central cylindrical portion 10d, a central circular portion 10e, an outer peripheral side cylindrical portion 10f, and an outer peripheral side annular ring. A portion 10g, an outermost peripheral side cylindrical portion 10h, and a clutch pressing portion 10i are provided, and are integrally formed as a whole.

  The inner peripheral side jaw 10a is an annular portion centered on the axis x, and a slight gap is formed between the end surface on the inner peripheral side (direction of arrow b) and the inner peripheral surface 101a of the housing 101. Has been done. The innermost peripheral side cylindrical portion 10b has a tubular shape centering on the axis line x extending from the outer peripheral side (arrow a direction) end of the inner peripheral side jaw portion 10a to the housing side (arrow c direction) along the axis x. It is a part.

  The innermost circumferential ring portion 10c is a ring-shaped portion centered on an axis line x extending from the end portion of the innermost circumferential cylindrical portion 10b on the housing side (direction of arrow c) to the outer circumferential side (direction of arrow a). is there. The central cylindrical portion 10d is a tubular portion centered on the axis line x extending from the end portion on the outer peripheral side (direction of arrow a) of the innermost circumferential ring portion 10c to the housing side (direction of arrow c) along the axis x. Is.

  The central annular portion 10e is an annular portion centered on an axis line x extending from the end of the central cylindrical portion 10d on the housing side (direction of arrow c) to the outer peripheral side (direction of arrow a). The outer peripheral side cylindrical portion 10f extends from the outer peripheral side (arrow a direction) end of the central annular portion 10e toward the multi-plate clutch side (arrow d direction) along the axis x, and has the axis x as the center. It is a tubular part.

  The outer peripheral side annular portion 10g is an annular portion centered on an axis line x which is slightly expanded from the end of the outer peripheral side cylindrical portion 10f on the multi-disc clutch side (arrow d direction) to the outer peripheral side (arrow a direction). is there. The outermost peripheral side cylindrical portion 10h extends from the outer peripheral side (arrow a direction) end of the outer peripheral annular portion 10g toward the multiple disc clutch side (arrow d direction) along the axis x, and is centered on the axis x. It is a tubular portion.

  The clutch pressing portion 10i is an annular portion centered on the axis x, which slightly expands from the end of the outermost peripheral side cylindrical portion 10h on the multi-disc clutch side (direction of arrow d) toward the outer peripheral side (direction of arrow a). Is.

  The clutch pressing portion 10i serves as a portion that presses the multi-plate clutch 60 when moving to the multi-plate clutch side (direction of arrow d) along the axis x of the piston seal 10. Therefore, the clutch pressing portion 10i moves in the stroke direction (arrow cd direction) along the axis x together with the piston seal 10 to engage or disengage the multi-plate clutch 60.

  At the outer peripheral side end of the clutch pressing portion 10i on the outer peripheral side (direction of arrow a), there is integrally formed a projecting portion 11 having a substantially rectangular shape in plan view extending from the outer peripheral side end to the outer peripheral side (direction of arrow a). It is fixed. A plurality of protrusions 11 are circumferentially arranged at the outer peripheral side end of the clutch pressing portion 10i.

  When the piston seal 10 is mounted on the inner peripheral surface 101a of the housing 101, the protrusion 11 is engaged with the engagement recess 102 formed on the inner peripheral surface 101a. As a result, the piston seal 10 prevents the piston seal 10 from rotating relative to the housing 101 during rotation about the axis x of the housing 101, and maintains the state in which the piston seal 10 rotates with the rotation of the housing 101. ..

  The elastic body portion 20 is a rubber-like elastic member that covers the outer peripheral surface of the piston seal 10 on the housing side (direction of arrow c), and is integrated with the piston seal 10. The elastic body portion 20 moves inside the housing 101 along the axis x integrally with the piston seal 10 toward the housing side (arrow c direction) or the multiple disc clutch side (arrow d direction). Examples of the elastic material of the elastic portion 20 include nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), fluororubber (FKM), silicone rubber, styrene-butadiene rubber ( A synthetic rubber such as SBR) is used.

  The elastic body portion 20 includes an inner peripheral side seal lip 21, an outer peripheral side seal lip 22, and a covering portion 23.

  The inner peripheral side seal lip 21 extends along the axis x from the inner peripheral side (arrow b direction) end of the inner peripheral jaw 10a of the piston seal 10 toward the housing (arrow c direction) and inner peripheral side (arrow b). Direction) is a part formed so as to project. The inner peripheral side seal lip 21 has a lip tip portion 21a that is in contact with the inner peripheral surface 101a of the housing 101 on the inner peripheral side (direction of arrow b) so as to slide along the axis x. ..

  The outer peripheral side seal lip 22 projects from the outer peripheral side (arrow a direction) end of the central annular portion 10e of the piston seal 10 along the axis x toward the housing side (arrow c direction) and the outer peripheral side (arrow a direction). It is a portion formed so as to. The outer peripheral seal lip 22 has a lip tip portion 22a that abuts on the inner peripheral surface 101a of the housing 101 on the outer peripheral side (direction of arrow a) so as to slide along the axis x.

  The covering portion 23 connects the inner peripheral side seal lip 21 and the outer peripheral side seal lip 22 and covers the outer peripheral surface of the piston seal 10 on the housing side (direction of arrow c) while facing the inner peripheral surface 101 a of the housing 101. This is the part to be covered. The covering portion 23 is cross-bonded to the housing side of the piston seal 10 (in the direction of arrow c) while being integrated with the inner peripheral side seal lip 21 and the outer peripheral side seal lip 22.

  The canceller seal 40 is an annular metal plate that holds the return spring 30 together with the piston seal 10. The canceller seal 40, which is a member supported by the housing 101 via a snap ring 43, rotates with the rotation of the housing 101 while being supported by the housing 101.

  As the metal material of the canceller seal 40, there are stainless steel, SPCC (cold rolled steel) and the like, and mainly SPFH (hot rolled steel) and SAPH (hot rolled steel). The canceller seal 40 is manufactured by, for example, press working or forging.

  The canceller seal 40 includes an inner peripheral side annular portion 40a, an inner peripheral side cylindrical portion 40b, a central annular portion 40c, an outer peripheral side cylindrical portion 40d, and an outer peripheral side annular portion 40e.

  The inner peripheral side annular portion 40 a of the canceller seal 40 is an innermost peripheral end portion on the inner peripheral side (direction of arrow b) of the canceller seal 40, and is supported by the snap ring 43.

  The inner peripheral side cylindrical portion 40b extends from the outer peripheral side (arrow a direction) end of the inner peripheral annular portion 40a toward the housing side (arrow c direction) and the outer peripheral side (arrow a direction) along the axis x. It is a cylindrical portion centered on the axis line x extending in an inclined state.

The central annular portion (bottom portion) 40c is an annular portion centered on the axis line x extending from the end portion of the inner peripheral side cylindrical portion 40b on the housing side (direction of arrow c) to the outer peripheral side (direction of arrow a). ..
The outer peripheral side cylindrical portion (cylindrical portion) 40d extends from the end portion on the outer peripheral side (arrow a direction) of the central annular portion 40c toward the housing side (arrow c direction) along the axis x, and is centered on the axis x. It is a tubular portion.

  The outer peripheral side annular portion 40e is an annular portion centered on an axis line x extending from the end portion of the outer peripheral side cylindrical portion 40d on the housing side (direction of arrow c) to the outer peripheral side (direction of arrow a). A canceller lip (seal member) 41 is integrally fixed to an end portion on the outer peripheral side (direction of arrow a) of the outer peripheral ring portion 40e.

  The canceller lip (seal member) 41 is a housing side (arrow c direction) and an outer peripheral side (arrow a direction) along the axis x from the outer peripheral side annular portion 40e of the canceller seal 40 on the outer peripheral side (arrow a direction) end. ) Is a portion formed so as to project. The canceller lip 41 slides along the inner peripheral surface (in the direction of arrow b) 10ha (hereinafter, also referred to as “inner peripheral surface”) 10ha of the outermost peripheral cylindrical portion 10h of the piston seal 10 along the axis x. It has a lip tip portion 41a that is abutted as described above.

  A canceller hydraulic chamber (low pressure oil chamber) P2 is formed between the canceller seal 40 and the piston seal 10. Hydraulic oil is supplied to the canceller hydraulic chamber P2 through an oil hole 101c provided in the inner peripheral surface 101a of the housing 101 near the inner peripheral side annular portion 40a on the multi-disc clutch side (direction of arrow d). It As a result, when the housing 101 rotates, centrifugal oil pressure is generated in the canceller oil pressure chamber P2, and acts to cancel the centrifugal oil pressure in the piston oil pressure chamber P1.

  The snap ring 43 is a support member that supports the inner peripheral side annular portion 40a of the canceller seal 40, and is fixed integrally with the housing 101 while being fitted into the recess of the inner peripheral surface 101a of the housing 101.

  A return spring 30 is interposed between the innermost ring portion 10c of the piston seal 10 and the center ring portion 40c of the canceller seal 40 in a state of being equally arranged. The return spring 30 is an elastic member formed of, for example, a metal compression coil spring, and biases the piston seal 10 toward the housing (direction of arrow c) so as to separate the piston seal 10 from the canceller seal 40. ..

  Specifically, a retainer 31 that connects the ends of the plurality of return springs 30 on the housing side (direction of arrow c) is fixed to the inner peripheral surface of the innermost annular portion 10c of the piston seal 10. On the other hand, the end of the return spring 30 on the multi-disc clutch side (the direction of arrow d) (the "end" referred to in claim 1). Hereinafter, when simply referred to as "end", the multi-disc clutch side (the direction of arrow d). Is supported by the central annular portion 40c of the canceller seal 40.

  FIG. 3 is an enlarged view of the return spring 30 and the canceller seal 40 extracted from the sealing device 1 according to the present embodiment. FIG. 3A is a partially enlarged plan view and FIG. 3B is a partially enlarged cross section. It is a figure. Hereinafter, description will be made with reference to FIGS. The return springs 30 are arranged at equal intervals in the annular direction of the canceller seal 40.

The central annular portion 40c is provided with a dome-shaped convex portion (positioning means) 42 that protrudes toward the housing side (direction of arrow c), and is fitted into the opening at the end portion of the return spring 30 to return the return spring. 30 is positioned and supported.
Further, the outer peripheral side cylindrical portion 40d is provided with a curved groove 44 having a shape corresponding to the outer peripheral shape of each return spring 30, and the return spring 30 is positioned with the outer periphery facing the curved groove 44. is doing.
These shapes can be easily formed by forging, casting, press working, or the like. Therefore, it can be manufactured at low cost.

  Here, the “shape corresponding to the outer peripheral shape of the return spring 30 (that is, the spring member)” in the curved groove 44 is a curved concave portion such that a part of the outer periphery of the return spring 30 can fit into the curved groove 44. The outer circumference of the return spring 30 and the inner surface shapes of the curved groove 44 do not necessarily have to be located on the concentric circles.

  In FIG. 3A, the axis line of the outer peripheral side cylindrical portion (cylindrical portion) 40d when viewed from the extension direction of the axis line X (the tip of the arrow c or the arrow d) (as viewed on the paper surface of FIG. A virtual circle C connecting the parts 45 closest to X is drawn. The return spring 30 straddles this imaginary circle C, and is in a position separated from the outer peripheral side cylindrical portion 40d (including the curved groove 44 and the portion 45).

  Since the coil-shaped spring member expands in diameter when compressed, if the outer peripheral surface of the coil-shaped spring member is in contact with any member, the movement thereof is restricted, which may affect the responsiveness. However, according to the configuration of the present embodiment, the return spring 30 is located at a position separated from the outer circumferential side cylindrical portion 40d, so that the movement of the return spring 30 is less likely to be restricted and the influence on the responsiveness is suppressed.

  In the present embodiment, the return spring 30 and the outer peripheral side cylindrical portion 40d are separated from each other so that the return spring 30 does not come into contact with the outer peripheral side cylindrical portion 40d even in the most compressed state. Therefore, the movement of the return spring 30 is not restricted, and there is no fear of affecting the responsiveness.

  Further, it is difficult to fit the end portion of the return spring 30 into the convex portion 42 during the assembling work only by providing the convex portion 42 on the central annular portion 40c as the positioning means, and the workability deteriorates. However, in the present embodiment, the outer peripheral side cylindrical portion 40d is provided with the curved groove 44 and the outer periphery of the return spring 30 has a shape corresponding to the curved groove 44. By simply approaching the central annular portion 40c along the curved concave groove 44, the convex portion 42 can be naturally fitted and the workability is excellent.

FIG. 4 illustrates a positional relationship among the convex portion 42, the end portions 30a, 30b, 30c of the return spring 30, and the outer peripheral side cylindrical portion 40d during assembly of the sealing device 1 according to the present embodiment. The schematic cross section in the cross section along the axis line X is shown.
In the present invention, a region where the end portion of the return spring 30 can be located when the position of the return spring 30 is restricted by the convex portion 42 when viewed from the extension direction of the axis X (upper or lower in FIG. 4) is referred to in the present invention. Is called a "positioning area".

  When the return spring 30 is moved from the upper side to the lower side (the direction of the multi-plate clutch) (in the direction of the arrow d) to assemble the return spring 30 at a predetermined position, the dome-shaped convex portion 42 has a height near the apex of the return spring 30. The end position of 30 begins to be regulated. As shown in FIG. 4, when the end portion of the return spring 30 is located at the height near the apex of the convex portion 42, the position from the position of the end portion 30a to the position of the end portion 30b becomes the positioning region w1.

  When the return spring 30 is further lowered, the positioning area is gradually narrowed. Then, when the end of the return spring 30 finally reaches the base of the convex portion 42, the positioning region w2 matches the width of the end 30c, and the end of the return spring 30 is positioned at the target position.

  In this operation, since the curved groove 44 is formed in the outer peripheral side cylindrical portion 40d, the end portion of the return spring 30 is guided to the convex portion 42. At this time, the positioning area w1 (= the widest positioning area when regulated by the convex portion 42 (positioning means)) includes the wall surface of the curved groove 44 in the area (the curved groove 44 is drawn by a dotted line in FIG. 4). In the case where the end portion of the return spring 30 first comes into contact with the convex portion 42 during the assembling, the convex portion 42 always guides it to the target position, which is particularly preferable.

  The shape of the convex portion as the positioning means in the present invention is not limited to the dome shape like the convex portion 42, and any shape such as a conical shape, a truncated cone shape, a pyramid shape, a truncated pyramid shape, a bell shape, or the like is selected. be able to. Although the positioning is inferior, the shape may be, for example, a columnar shape or a prismatic shape, the thickness of which does not change toward the tip.

The positioning means in the present invention may be a recess in which the central annular portion 40c (= bottom portion) is depressed and the end portion of the return spring 30 (= spring member) is fitted.
FIG. 5 is a schematic cross-sectional view from the same direction as FIG. 4 for explaining the positional relationship between the recess, the end of the return spring, and the outer peripheral side cylinder when the sealing device is assembled when the positioning means is the recess. The figure is shown. FIG. 5 schematically shows the positional relationship among the recess 46, the end portions 30d, 30e, 30f of the return spring 30, and the outer peripheral side cylindrical portion 40d.

  The recess 46 has a shape of an inverted truncated cone. When the return spring 30 is moved from the upper side to the lower side (in the direction of arrow d) so as to be assembled in a predetermined position, the end position of the return spring 30 is regulated at the height near the opening in the recess 46. start. As shown in FIG. 5, when the end portion of the return spring 30 is located at the height near the opening of the recess 46, the positioning area w3 is from the position of the end portion 30d to the position of 30e.

  When the return spring 30 is further lowered, the positioning area is gradually narrowed. When the end of the return spring 30 finally reaches the bottom of the recess 46, the positioning region w4 matches the width of the end 30f, and the end of the return spring 30 is positioned at the target position.

  In this operation, since the curved groove 44 is formed in the outer peripheral side cylindrical portion 40d, the end portion of the return spring 30 is guided to the concave portion 46. At this time, the positioning region w3 (= the widest positioning region when regulated by the recess 46 (positioning means)) includes the wall surface of the curved groove 44 in the region (the curved groove 44 is drawn by a dotted line in FIG. 5). The position is particularly preferable since the end of the return spring 30 is guided to the target position by the recess 46 when the end of the return spring 30 first reaches the recess 46 during assembly.

  The shape of the recessed portion as the positioning means in the present invention is not limited to the inverted truncated cone shape like the recessed portion 46, and any shape such as an inverted conical shape, an inverted pyramidal shape, an inverted truncated pyramid shape, an inverted bell shape, an inverted dome shape or the like can be used. The shape can be selected. Although the positioning is inferior, the shape may be a shape such as a cylindrical shape or a rectangular tube shape whose thickness does not change in the depth direction.

  Although the sealing device of the present invention has been described above with reference to the preferred embodiment and its modification, the sealing device of the present invention is not limited to the configuration of the above embodiment. For example, in the above-described embodiment and its modified example, as the positioning means, the convex portion or the concave portion integrally formed by molding the central annular portion 40c that is the bottom portion is taken as an example, but in the present invention, For example, a member corresponding to the convex portion may be prepared as a separate component and attached to the bottom portion to form the convex portion, or a ring-shaped member may be prepared as a separate component and attached to the bottom portion to form the spring. The positioning means may have a shape surrounding the end of the member.

  In addition, those skilled in the art can appropriately modify the sealing device of the present invention according to the conventionally known knowledge. As long as such a modification still has the configuration of the present invention, it is of course included in the scope of the present invention.

  INDUSTRIAL APPLICABILITY The sealing device of the present invention can be used as a sealing device that is a constituent element of an automatic transmission used in vehicles such as automobiles and their auxiliary machines, general industrial machines, construction machines and the like. ..

DESCRIPTION OF SYMBOLS 1 ... Sealing device, 10 ... Piston seal (piston), 11 ... Projection part, 20 ... Elastic body part, 21 ... Inner peripheral seal lip, 22 ... Outer peripheral seal lip, 23 ... Cover part, 30 ... Return spring (spring) Member), 40 ... Canceller seal (plate member), 40a ... Inner peripheral side annular part, 40b ... Inner peripheral side cylindrical part, 40c ... Central annular part (bottom part), 40d ... Outer peripheral side cylindrical part (cylindrical part), Reference numeral 40e ... Outer peripheral side annular portion, 41 ... Canceller lip (seal member), 42 ... Convex portion (positioning means), 43 ... Snap ring, 44 ... Curved groove, 46 ... Recessed portion (positioning means), 60 ... Multi-disc clutch , 101 ... Housing, 101a ... Inner peripheral surface, 101b, 101c ... Oil hole, P1 ... Piston hydraulic chamber (high pressure oil chamber), P2 ... Canceller hydraulic chamber (low pressure oil chamber), x ... Axis

Claims (5)

A piston, a plurality of coil-shaped spring members for urging the piston toward the high-pressure oil chamber along the axis, and supporting an end of the spring member opposite to the urging side of the piston. A plate member that forms a low-pressure oil chamber for hydraulic pressure adjustment on the side opposite to the high-pressure oil chamber side of the piston; and a seal member that is provided on the outer peripheral portion of the plate member and seals the low-pressure oil chamber. A sealing device provided with,
The plate member includes a bottom portion facing the piston, and a tubular portion rising from the outer edge of the bottom portion in the piston direction,
The bottom portion is provided with positioning means for determining a position for supporting the end portions of the individual spring members,
The cylindrical portion is provided with a curved groove having a shape corresponding to the outer peripheral shape of each of the spring members,
The sealing is characterized in that the spring member straddles a virtual circle that connects a portion of the tubular portion closest to the axis when viewed from the extension direction of the axial line, and is located at a position separated from the tubular portion. apparatus.   The sealing device according to claim 1, wherein the spring member is separated from the tubular portion even in the most compressed state. The positioning region viewed from the extension direction of the axis, in which the end portion of the spring member can be positioned when regulated by the positioning means, has the spring from the piston side to the plate member side in the axial direction. The positioning means is configured so as to be gradually narrowed as the end portion of the member advances and finally reach a target position,
3. The sealing device according to claim 1, wherein the widest positioning region when regulated by the positioning means includes the wall surface of the curved groove in the region.   The sealing device according to any one of claims 1 to 3, wherein the positioning means is a convex portion that protrudes from the bottom portion and is fitted into the opening of the end portion of the spring member.   The sealing device according to any one of claims 1 to 3, wherein the positioning means is a recess into which the bottom portion is depressed and the end portion of the spring member is fitted.

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