CN113090684A

CN113090684A - Plate component with lip

Info

Publication number: CN113090684A
Application number: CN202011197482.6A
Authority: CN
Inventors: 太田崇文; 高桥贵幸
Original assignee: Nok Corp
Current assignee: Nok Corp
Priority date: 2020-01-08
Filing date: 2020-10-30
Publication date: 2021-07-09
Also published as: JP2021110354A; JP7372842B2

Abstract

The invention provides a plate member with a lip, which can reliably avoid the curl of the lip during assembly. A piston member (3) (a plate member with a lip) inserted into a ring-shaped piston mounting portion (M1) includes a ring-shaped piston plate (31), an inner lip (32), and a first outer lip (33). Each lip (32, 33) has a base end portion (32a, 33a) fixed to the piston plate (31) and a tip end portion (32b, 33b) slidably contacting the side surface (111, 112) of the piston mounting portion (M1), and is formed in a tapered cylindrical shape, having an enlarged diameter from the base end portion (32a, 33a) to the tip end portion (32b, 33b), and extending toward the bottom surface (113) of the piston mounting portion (M1). Each of the distal end portions (32b, 33b) has a holding portion (32c, 33c) capable of holding a fluid in the recess over the entire circumference.

Description

Plate component with lip

Technical Field

The present invention relates to a lipped plate member inserted into a ring-groove-shaped mounting portion, and more particularly to a lipped plate member applicable to a clutch piston mechanism for operating a clutch.

Background

Generally, in a clutch piston mechanism for an automatic transmission (including a continuously variable transmission), a piston member is reciprocated by oil pressure of an oil pressure chamber. The multi-plate clutch is engaged or disengaged by the reciprocating motion of the piston member, thereby shifting the vehicle. As an example of a conventional piston member, a piston seal for an automatic transmission disclosed in patent document 1 is known. A piston seal for an automatic transmission (hereinafter referred to as a "piston member") described in patent document 1 is disposed inside a cylinder having a bottomed cylindrical shape, and a pressure chamber (hereinafter referred to as a "hydraulic chamber") is formed between the piston seal and the cylinder. The piston member has a piston plate made of a metal plate, and an inner peripheral seal lip made of a rubber-like elastic body is fixed to an inner peripheral portion of the piston plate. An outer peripheral seal lip made of a rubber-like elastic material is fixed to an outer peripheral portion of the piston plate.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2010-190391.

Disclosure of Invention

Problems to be solved by the invention

However, in the clutch piston mechanism as described above, when the piston member is inserted into the cylinder, the respective distal ends of the inner circumferential seal lip and the outer circumferential seal lip of the piston member abut against the end surface of the insertion port of the cylinder. A relief portion formed by chamfering an angle of an opening end is formed in the insertion port of the cylinder. Therefore, when the tip end portion of each seal lip of the piston member is pushed into the cylinder, the tip end portion receives resistance (load) from the retreat portion of the cylinder. When this resistance increases, the tip end side portion of the seal lip of the piston member tends to curl outward in the direction opposite to the insertion direction. Therefore, a design for avoiding curling of the seal lip when assembled to the cylinder may be required. Such a design is also required for a seal lip of a cancellation member (BCS) provided in the clutch piston mechanism for canceling the centrifugal oil pressure at the time of high-speed rotation.

Accordingly, an object of the present invention is to provide a lipped plate member capable of reliably avoiding curling of a lip at the time of assembly.

Means for solving the problems

According to an aspect of the present invention, there is provided a lipped plate member that is inserted into an attachment portion via an insertion opening having a relief portion in an annular groove-shaped attachment portion. The lipped plate member includes an annular plate and a lip provided on at least one of an inner peripheral portion and an outer peripheral portion of the plate. The lip has a base end fixed to the plate and a tip end slidably contacting the side surface of the mounting portion, and expands in diameter from the base end to the tip end and extends toward the bottom surface of the mounting portion. The tip end portion of the lip has a holding portion capable of holding fluid in the recess over the entire circumference.

Effects of the invention

According to an aspect of the present invention, it is possible to provide a lipped plate member that can reliably avoid curling of the lip at the time of assembly.

Drawings

Fig. 1 is a sectional view of an essential part showing the structure of a clutch piston mechanism to which a lipped plate member according to an embodiment of the present invention is attached.

FIG. 2 is an enlarged cross-sectional view of the inner lip including the piston member prior to insertion.

Fig. 3 is a partial plan view showing a positional relationship between the opening portion of the inner lip and the receding portion of the mounting portion as viewed from the B direction shown in fig. 2.

FIG. 4 is an enlarged cross-sectional view of the first outboard lip including the piston member prior to insertion.

Fig. 5 is an enlarged cross-sectional view of the second outer lip including a relief prior to insertion.

Detailed Description

[ schematic Structure of Clutch piston mechanism ]

Embodiments of a lipped plate member according to the present invention will be described below with reference to the drawings.

Fig. 1 is a sectional view of an essential part showing the structure of a clutch piston mechanism to which a lipped plate of one embodiment of the present invention is mounted. The clutch piston mechanism 1 shown in fig. 1 is mainly used for an automatic transmission for a vehicle, and is configured to be accommodated in an accommodating portion 11 of a housing 10 together with a multiple disc clutch C to engage and disengage the multiple disc clutch C. The housing 11 is formed in a ring groove shape around the axis X of the housing 10 (centered on the axis X). In the present specification, a side close to the axis X is referred to as "inner side", a direction close to the axis X is referred to as "inner side", a side far from the axis X is referred to as "outer side", and a direction far from the axis X is referred to as "outer side".

The housing portion 11 is formed as a space defined by an inner side surface 111, an outer side surface 112, and a bottom surface 113 connecting end portions of the inner side surface 111 and the outer side surface 112. The inner side surface 111 and the outer side surface 112 of the housing 11 are surfaces parallel to the axis X, and the bottom surface 113 of the housing 11 is a surface perpendicular to the axis X. The inner side surface 111 and the outer side surface 112 need only be substantially parallel to the axis X and need not be strictly parallel, and the bottom surface 113 need only be substantially perpendicular to the axis X and need not be strictly perpendicular.

The inner side surface 111 of the accommodating portion 11 is formed as a stepped surface having a first inner side surface 111a and a second inner side surface 111b, the first inner side surface 111a being located on a side close to the bottom surface 113, and the second inner side surface 111b being located on a side away from the bottom surface 113 and being located further inward than the first inner side surface 111 a. The outer side surface 112 of the accommodating portion 11 is formed as a stepped surface having a first outer side surface 112a and a second outer side surface 112b, the first outer side surface 112a being located on a side close to the bottom surface 113, and the second outer side surface 112b being located on a side away from the bottom surface 113 and being located further outside than the first outer side surface 112 a. The multiple disc clutch C is disposed in a region of the housing portion 11 corresponding to the second outer side surface 112 b.

A piston member 3, which will be described later, of the clutch piston mechanism 1 can be mounted in a space defined by the first inner side surface 111a, the first outer side surface 112a, and the bottom surface 113 of the housing 11, and a hydraulic chamber 20 is formed between the piston member 3 and the housing 10. Hereinafter, the region (space) in the housing portion 11, which serves as the mounting portion for the piston member 3, is referred to as "piston mounting portion M1". That is, the piston mounting portion M1 is formed as a space defined by the first inner side surface 111a, the first outer side surface 112a, and the bottom surface 113. The piston member 3 is inserted into the piston mounting portion M1 through an insertion opening that is open on the side opposite to the bottom surface 113 in the piston mounting portion M1.

The escape portion 12 is formed in the insertion port of the piston mounting portion M1. The relief portion 12 has an inner relief portion 111c as a radially inner portion and an outer relief portion 112c as a radially outer portion. The inner escape portion 111c is formed by, for example, machining (chamfering) to cut off a corner portion located at the opening end of the first inner side surface 111a in an inclined manner. The second inner side surface 111b is connected to an end of the inner escape portion 111c opposite to the first inner side surface 111 a. In other words, the stepped portion of the inner side surface 111 is constituted by the inner escape portion 111 c. The outer escape portion 112c is formed by, for example, machining (chamfering) to cut off a corner portion of the opening end of the first outer side surface 112a obliquely. An outer end of the stepped surface 112d extending radially outward from an end of the outer escape portion 112c opposite to the first outer side surface 112a is connected to the second outer side surface 112 b. In other words, the stepped portion of the outer side surface 112 is constituted by the outer escape portion 112c and the stepped surface 112 d.

The clutch piston mechanism 1 includes a piston member 3, a cancel member 5, and a return spring 7. In the present embodiment, the piston member 3 and the cancellation member 5 correspond to a "lipped plate member" according to the present invention, and the return spring 7 corresponds to an "urging member" according to the present invention.

The piston member 3 includes: a piston plate 31 made of a metal material and formed integrally in a ring shape; an inner lip 32 provided on the inner peripheral portion of the piston plate 31; and a first outer lip 33 provided on the outer peripheral portion of the piston plate 31 constitute a so-called "joined piston seal (BPS)". The centerline of the piston member 3 coincides with the axis X of the housing 10. The piston member 3 is movable (reciprocating) in the axis X direction (extending direction of the axis X) of the housing 10 within the piston mounting portion M1. The center line of the piston member 3 need only be substantially coincident with the axis X of the housing 10, and need not be exactly coincident.

The piston plate 31 has a first annular plate portion 31a, an inner cylindrical portion 31b, an outer cylindrical portion 31c, a first inner extending portion 31d, and a first outer extending portion 31e, and these members (31a to 31e) are integrally formed.

The first annular plate 31a faces the bottom surface 113 of the housing 11. The inner cylindrical portion 31b extends from the inner peripheral edge of the first annular plate portion 31a in a direction away from the bottom surface 113 of the accommodating portion 11. The outer cylindrical portion 31c extends from the outer peripheral edge of the first annular plate portion 31a in a direction away from the bottom surface 113 of the accommodating portion 11. A gap is provided between the outer cylindrical portion 31c and the first outer side surface 112a of the accommodating portion 11. The first inward extending portion 31d extends inward in a flange shape from a distal end portion (lower end portion in fig. 1) of the inner cylindrical portion 31 b. A gap is also provided between the end of the first inward extending portion 31d and the first inner side surface 111a of the accommodating portion 11. The first outward extending portion 31e extends outward (specifically, the second outward side surface 112b of the housing portion 11) in a flange shape from a distal end portion (lower end portion in fig. 1) of the outer cylindrical portion 31 c. The outer cylindrical portion 31C and the first outer extending portion 31e are positioned above the multiple disc clutch C. The piston plate 31 can be formed by, for example, press working a rolled steel plate.

The inner lip 32 seals a gap between the inner peripheral portion of the piston plate 31 (specifically, the end of the first inward extending portion 31d) and the first inner side surface 111a of the housing 11. The first outer lip 33 seals a gap between the outer peripheral portion of the piston plate 31 (specifically, the first outer cylindrical portion 31c) and the first outer side surface 112a of the housing portion 11. In the piston member 3 of the present embodiment, the inner lip 32 corresponds to the "inner lip" of the "piston member" according to the present invention, and the first outer lip 33 corresponds to the "outer lip" of the "piston member" according to the present invention.

The inner lip 32 and the first outer lip 33 are formed of synthetic rubber such as nitrile rubber (NBR), acrylic rubber (ACM), silicone rubber (VMQ), and fluorine rubber (FKM), and are formed as so-called lip seals. The distal end portion of the inner lip 32 contacts the first inner side surface 111a of the housing portion 11, and slides along the first inner side surface 111a of the housing portion 11 in accordance with the movement of the piston member 3. The distal end portion of the first outer lip 33 contacts the first outer side surface 112a of the housing portion 11, and slides along the first outer side surface 112a of the housing portion 11 in accordance with the movement of the piston member 3. Therefore, the inner lip 32 is always in contact with the first inner side surface 111a of the housing portion 11, and the first outer lip 33 is always in contact with the first outer side surface 112a of the housing portion 11, whereby the sealed hydraulic chamber 20 is formed between the bottom surface 113 of the housing portion 11 and the piston member 3. In other words, the hydraulic chamber 20 is a space on the bottom surface 113 side of the piston mounting portion M1 with respect to the piston member 3. The detailed shapes and the like of the inner lip 32 and the first outer lip 33 will be described later.

One end of the working passage 21 for supplying the working oil to the hydraulic chamber 20 is open at a portion on the bottom surface 113 side of the first inner side surface 111a of the housing portion 11. The piston member 3 is configured to move in a direction (the direction of arrow a in fig. 1) away from the bottom surface 113 of the housing 11 by the hydraulic pressure of the hydraulic oil supplied to the hydraulic chamber 20, and to engage the multi-plate clutch C by the first outward extending portion 31e pressing the clutch plates C1 on the drive side of the multi-plate clutch C. In the present embodiment, the direction of arrow a corresponds to the "first direction" according to the present invention.

The cancellation member 5 is disposed on the opposite side of the bottom surface 113 of the housing portion 11 with respect to the piston member 3 (i.e., on the side of the piston member 3 in the arrow a direction). Specifically, the cancellation member 5 is disposed at a distance in a direction away from the bottom surface 113 of the housing portion 11 with respect to the first annular plate portion 31a and the inward extending portion 31d of the piston plate 31 as a whole.

The cancel member 5 includes a cancel plate 51 formed of a metal material and formed in a ring shape as a whole, and a second outside lip 52 provided on an outer peripheral portion of the cancel plate 51, and constitutes a so-called "joint cancel seal (BCS)". The center line of the cancellation member (BCS)5 coincides with the axis X of the housing 10 (as long as it substantially coincides, it does not need to strictly coincide).

The cancel plate 51 has a second annular plate portion 51a, an intermediate cylindrical portion 51b, and a second outwardly extending portion 51c, and these members (51a to 51c) are integrally formed.

The second annular plate 51a is located on the side of the first annular plate 31a, the inner cylindrical portion 31b, and the inner extension 31d of the piston plate 31 in the arrow a direction. Specifically, the second annular plate portion 51a faces the first annular plate portion 31a and the inward extending portion 31d of the piston plate 31. The intermediate cylindrical portion 51b extends from the outer peripheral edge of the second annular plate portion 51a toward the first annular plate portion 31a of the piston plate 31. The intermediate cylindrical portion 51b is located radially between the inner cylindrical portion 31b and the outer cylindrical portion 31c of the piston plate 31. The second outwardly extending portion 51c extends outwardly from a distal end portion (upper end portion in fig. 1) of the intermediate cylindrical portion 51b, more specifically, extends in a flange shape toward an inner surface of the outer cylindrical portion 31c of the piston plate 31. A gap is formed between the inner peripheral edge of the second annular plate portion 51a and the second inner side surface 111b of the accommodating portion 11. A gap is also formed between the end of the second outwardly extending portion 51c and the outer cylindrical portion 31c of the piston plate 31. The cancel plate 51 can be formed by, for example, subjecting a rolled steel plate to press working or the like.

The second outer lip 52 seals a gap between the outer peripheral portion of the cancel plate 51 (specifically, the end portion of the second outwardly extending portion 51c) and the outer cylindrical portion 31c of the piston plate 31. The second outer lip 52 is made of synthetic rubber and formed as a so-called lip seal, for example, as in the case of the inner lip 32 and the first outer lip 33 of the piston member 3. The distal end portion of the second outer lip 52 contacts the outer cylindrical portion 31c of the piston plate 31 and slides along the inner surface of the outer cylindrical portion 31c of the piston plate 31. In the eliminating member 5 of the present embodiment, the second outer lip 52 corresponds to the "outer lip" of the "eliminating member" according to the present invention.

In addition, the eliminating member 5 restricts the movement in the arrow a direction by the stopper ring 53. The stopper ring 53 is fixed to the second inner side surface 111b of the accommodating portion 11 in a state of abutting against a portion of the second annular plate portion 51a of the cancel plate 51 on the side opposite to the bottom surface 113 of the accommodating portion 11, the portion being located inward of the convex portion 51 d. The stopper ring 53 restricts the movement of the cancellation member 5 in the arrow a direction by the contact of the bottom surface 113 side surface of the housing portion 11 with the portion of the second annular plate portion 51a on the inner side of the convex portion 51d, and restricts the movement of the cancellation member 5 in the radial direction by the contact of the outer peripheral surface thereof with the side surface of the convex portion 51 d.

A canceller hydraulic chamber 22 is formed between the piston member 3 and the canceller member 5. In other words, the canceller member 5 and the piston member 3 cooperate to form the canceller hydraulic chamber 22. When the housing 10 and the like rotate at high speed during disengagement of the multiple disc clutch C, centrifugal hydraulic pressure is generated in the hydraulic chamber 20 by the hydraulic oil remaining in the hydraulic chamber 20, and the piston member 3 may move in the arrow a direction by the force generated by the generated centrifugal hydraulic pressure, thereby engaging the multiple disc clutch C. The cancel hydraulic chamber 22 is provided to suppress the influence of the centrifugal hydraulic pressure generated in the hydraulic chamber 20. Specifically, when a predetermined amount of oil is stored in the hydraulic erasing chamber 22 and centrifugal hydraulic pressure is generated in the hydraulic chamber 20, centrifugal hydraulic pressure is also generated in the hydraulic erasing chamber 22. Accordingly, the force opposing the force of the centrifugal hydraulic pressure generated in the hydraulic chamber 20 acts on the piston member 3, and the influence of the centrifugal hydraulic pressure generated in the hydraulic chamber 20 can be suppressed.

The mounting portion of the canceller member 5 that can form the canceller hydraulic chamber 22 corresponds to a space defined by the piston plate 31 (specifically, the first annular plate portion 31a, the inner cylindrical portion 31b, the outer cylindrical portion 31c, and the first inward extending portion 31d) and the inner lip 32 of the piston member 3 and the inner side surface 111 (specifically, the first inner side surface 111a, the second inner side surface 111b, and the inner escape portion 111c) of the housing portion 11. In the following description, a region (space) in the housing 11, which is a mounting portion of the cancellation member 5, is referred to as "cancellation mounting portion M2".

The cancel member 5 is inserted into the cancel mounting portion M2 through an insertion opening that opens on the opposite side of the cancel mounting portion M2 from the first annular plate portion 31 a. The same retreat portion 13 as the piston mounting portion M1 is formed in the insertion port of the cancel mounting portion M2. The escape portion 13 has an outer escape portion 31f formed at a tip end portion (lower end portion in fig. 1) of the outer cylindrical portion 31c of the piston plate 31. The outer escape portion 31f is formed by rounding (R-chamfering) an inner corner portion where the outer cylindrical portion 31c of the piston plate 31 is connected to the first outer extending portion 31 e.

The return spring 7 is disposed between the piston member 3 and the eliminating member 5. The return spring 7 biases the piston member 3 and the cancellation member 5 in directions away from each other. In other words, the return spring 7 biases the piston member 3 in the direction opposite to the arrow a direction. Specifically, the return spring 7 biases the piston member 3 in a direction approaching the bottom surface 113 of the housing portion 11. Therefore, in the present embodiment, the direction opposite to the arrow a direction (the direction approaching the bottom surface 113 of the housing portion 11) corresponds to the "second direction" according to the present invention.

[ detailed Structure of piston Member ]

Next, the detailed structure of the piston member 3 in the present embodiment will be described centering on the inner lip 32 and the first outer lip 33 with reference to fig. 2 to 4.

Fig. 2 is an enlarged sectional view showing the vicinity of the inner lip 32 of the piston member 3 in a state before the piston member 3 is inserted into the piston mounting portion M1 (before mounting). Fig. 3 is a partial plan view showing a positional relationship between an opening portion of an inner holding portion 32c, which will be described later, of the inner lip 32 and the inner escape portion 111c of the accommodating portion 11, as viewed from the direction B shown in fig. 2. Fig. 4 is an enlarged sectional view showing the vicinity of the first outer lip 33 of the piston member 3 in a state before insertion.

As shown in fig. 2, the inner lip 32 of the piston member 3 has a base end portion 32a and a tip end portion 32 b. The base end portion 32a is fixed so as to cover the end portion of the first inward extending portion 31d of the piston plate 31 from the inner side surface 111 side of the housing portion 11. In a state where the piston member 3 is inserted into the piston mounting portion M1, the distal end portion 32b slidably contacts the first inner side surface 111a of the accommodating portion 11 (the piston mounting portion M1). The inner lip 32 is formed in a tapered cylindrical shape that expands in diameter from the base end portion 32a to the tip end portion 32b and extends toward the bottom surface 113 of the accommodating portion 11.

The distal end portion 32b of the inner lip 32 has an annular inner holding portion 32c capable of holding fluid in the recess over the entire circumference. The inner surface of the inner holding portion 32c is formed of a straight line portion SL1 extending straight from the bottom of the recess toward the bottom surface 113 of the housing 11, and a curved line portion CL1 extending from the bottom of the recess toward the inner side surface 111 of the housing 11 and smoothly curving. The straight line portion SL1 is parallel (substantially parallel, not strictly parallel) to the first inner side surface 111a (axis X) of the accommodating portion 11. The curved line portion CL1 is connected to one end (the bottom of the recess of the inner holding portion 32 c) of the straight line portion SL1 on the opposite side to the bottom surface 113 of the accommodating portion 11.

The inner holding portion 32c of the inner lip 32 opens to the inner side surface 111 of the accommodating portion 11 between the other end P1 on the bottom surface 113 side of the accommodating portion 11 in the straight portion SL1 and a tangent point P2 drawn from the other end P1 to a tangent line (a broken line in fig. 2) of the curved portion CL 1. Therefore, the inner holding portion 32c can hold fluid such as mounting oil flowing in from its opening portion inside the annular recess having the inner surface formed by the straight line portion SL1 and the curved line portion CL 1.

The opening portion of the inner holding portion 32c in the inner lip 32 is located within the range of the inner escape portion 111c formed on the inner side surface 111 of the accommodating portion 11 (piston mounting portion M1) in a plan view (fig. 3) viewed from the insertion direction (arrow B direction in fig. 2) of the piston member 3 into the piston mounting portion M1. In other words, in the inner holding portion 32c of the inner lip 32, the straight line portion SL1 is located on the inner side (the side closer to the axis X) than the first inner side surface 111a of the accommodating portion 11, and the tangent point P2 on the curved line portion CL1 is located on the outer side (the side away from the axis X) than the end (the second inner side surface 111b of the accommodating portion 11) of the inner escape portion 111c on the side opposite to the first inner side surface 111 a.

As shown in fig. 4, the first outer lip 33 of the piston member 3 has a base end portion 33a and a tip end portion 33 b. The base end portion 33a is fixed so as to cover the outer circumferential end portion of the first annular plate portion 31a of the piston plate 31 and the outer surface of the first outer cylindrical portion 31c from the outer side surface 112 side of the housing portion 11. In a state where the piston member 3 is inserted into the piston mounting portion M1, the distal end portion 33b slidably contacts the first outer side surface 112a of the accommodating portion 11 (piston mounting portion M1). The first outer lip 33 is formed in a tapered cylindrical shape that expands in diameter from the base end portion 33a to the tip end portion 33b and extends toward the bottom surface 113 of the accommodating portion 11.

The distal end portion 33b of the first outer lip 33 has an annular outer holding portion 33c capable of holding a fluid in the recess over the entire circumference, as in the case of the inner lip 32. The inner surface of the outer holding portion 33c is constituted by a straight line portion SL2 extending straight from the bottom of the recess toward the bottom surface 113 side of the housing portion 11, and a curved line portion CL2 extending from the bottom of the recess toward the outer side surface 112 side of the housing portion 11 and smoothly curved. The straight line portion SL2 is parallel (substantially parallel, not strictly parallel) to the first outer side surface 112a (axis X) of the accommodating portion 11. The curved line portion CL2 is connected to one end (the bottom of the recess of the outer holding portion 33c) of the straight line portion SL2 on the opposite side to the bottom surface 113 of the accommodating portion 11.

The outer holding portion 33c of the first outer lip 33 opens to the outer side surface 112 of the accommodating portion 11 between the other end P3 on the bottom surface 113 side of the accommodating portion 11 in the straight portion SL2 and a tangent point P4 drawn from the other end P3 to a tangent line (a broken line in fig. 3) of the curved portion CL 2. Therefore, the outer holding portion 33c can hold the fluid such as the assembly oil flowing in from the opening portion thereof inside the annular recess having the inner surface constituted by the straight line portion SL2 and the curved line portion CL 2.

The opening portion of the outer holding portion 33c of the first outer lip 33 is located within the range of the outer escape portion 112c formed on the outer side surface 112 of the accommodating portion 11 (piston mounting portion M1) in a plan view (not shown) viewed in the insertion direction of the piston member 3 into the piston mounting portion M1. In other words, in the outer holding portion 33c of the first outer lip 33, the straight line portion SL2 is located on the outer side (the side away from the axis X) than the first outer side surface 112a of the accommodating portion 11, and the tangent point P4 on the curved portion CL2 is located on the inner side (the side closer to the axis X) than the end (the end inside the step surface 112 d) of the outer escape portion 112c on the opposite side to the first outer side surface 112 a.

[ Assembly work of piston Member ]

However, in the conventional clutch piston mechanism, the inclination of the chamfered surface (in other words, the inclined surface or the tapered surface) in the retreat portion of the insertion port of the piston attachment portion and the inclination of the tip end portion (contact surface) of each lip portion of the piston member are generally the same angle in many cases. In this case, the area of the contact surface between the retreat portion and the tip end portion of the lip when the piston member is inserted becomes large. The contact surface is normally lubricated by supplying fitting oil or the like, but when the area of the contact surface becomes large, the oil film is easily broken, and it is difficult to maintain the lubricated state. In such a state, the resistance (load) received by the tip end portion of each seal lip from the retreat portion of the cylinder increases, and therefore, the tip end portion of the seal lip may curl.

In contrast, in the present embodiment, when the piston member 3 having the inner lip 32 and the first outer lip 33 is inserted into the piston mounting portion M1, the worker applies the mounting oil to the retracted

portions

111c and 112c of the inner side surface 111 and the outer side surface 112 of the accommodating portion 11 and the

distal end portions

32b and 33b of the inner lip 32 and the first outer lip 33, for example, in advance. Thus, the mounting oil flows into the inside of the holding

portions

32c, 33c of the inner lip 32 and the first outer lip 33. When the operator moves the piston member 3 to the insertion port of the piston mounting portion M1, the distal end portion 32b of the inner lip 32 of the piston member 3 abuts against the inner retreat portion 111c of the inner side surface 111 of the accommodating portion 11, and the distal end portion 33b of the first outer lip 33 of the piston member 3 abuts against the outer retreat portion 112c of the outer side surface 112 of the accommodating portion 11. At this time, as described above, when the inclination of the chamfered surface of each of the receding

portions

111c and 112c and the inclination of each of the

distal end portions

32b and 33b of the inner lip 32 and the first outer lip 33 are at substantially the same angle, each of the receding

portions

111c and 112c and each of the

distal end portions

32b and 33b come into contact with each other over a large area. However, in the present embodiment, gaps formed by the inner holding portion 32c of the inner lip 32 and the outer holding portion 33c of the first outer lip 33 are formed between the contact surfaces, and the fitting oil applied in advance is held in each gap. In this state, when the

distal end portions

32b and 33b of the inner lip 32 and the first outer lip 33 are pushed into the piston mounting portion M1 while contacting the retracted

portions

111c and 112c, the mounting oil held by the holding

portions

32c and 33c of the

distal end portions

32b and 33b is supplied between the contact surfaces. Thus, even if the area of the contact surface is large, the oil film is hard to break, and the contact surface can be maintained in a lubricated state. Therefore, an increase in resistance (load) received by the distal ends 32b, 33b of the inner lip 32 and the first outer lip 33 from the retracted

portions

111c, 112c can be suppressed, and curling of the distal ends 32b, 33b can be reliably avoided.

The effect of the holding

portions

32c and 33c of the

distal end portions

32b and 33b as described above is not limited to the case where the inclination of the chamfered surfaces of the receding

portions

111c and 112c and the inclination of the

distal end portions

32b and 33b are at substantially the same angle. For example, the same effect can be obtained even when the inclination (the angle formed by the axis X and the contact surface) of each of the

distal end portions

32b and 33b is larger than the inclination (the angle formed by the axis X and the chamfered surface) of each of the receding

portions

111c and 112 c. In this case, the distal ends 32b and 33b of the inner lip 32 and the first outer lip 33 first come into contact with the

escape portions

111c and 112c at the opening ends (corresponding to the aforementioned contact points P2 and P4) of the holding

portions

32c and 33c, respectively, on the side away from the bottom surface 113 of the accommodating portion 11. In the process of pushing the

distal end portions

32b and 33b into the piston mounting portion M1 while contacting the retracted

portions

111c and 112c, the

distal end portions

32b and 33b are elastically deformed, and thereby the open ends (corresponding to the other ends P1 and P3) on the side close to the bottom surface 113 of the accommodating portion 11 come into contact with the retracted

portions

111c and 112 c. In this way, even in a state where the open end portions of the holding

portions

32c and 33c are in contact with the receding

portions

111c and 112c, the mounting oil held by the holding

portions

32c and 33c is supplied between the contact surfaces, and therefore, curling of the

distal end portions

32b and 33b can be reliably avoided.

In the present embodiment, the opening portions of the holding

portions

32c and 33c are located within the ranges of the

escape portions

111c and 112c, respectively, in a plan view seen from the insertion direction of the piston member 3. Thus, the mounting oil held in the holding

portions

32c and 33c is reliably supplied to the space between the contact surfaces of the retracting

portions

111c and 112c and the

distal end portions

32b and 33 b. Therefore, curling of the

distal end portions

32b and 33b of the inner lip 32 and the first outer lip 33 can be more reliably avoided.

[ detailed Structure of eliminating Member ]

Next, the detailed structure of the eliminating member 5 in the present embodiment will be described with reference to fig. 5 centering on the second outer lip 52. Fig. 5 is an enlarged sectional view showing the vicinity of the second outer lip 52 of the eliminating member 5 in a state before the eliminating member 5 is inserted into the eliminating attachment portion M2.

As shown in fig. 5, the second outer lip 52 of the eliminating member 5 has a base end portion 52a and a tip end portion 52 b. The base end portion 52a is fixed so as to cover the end portion of the second outward extending portion 51c of the cancel plate 51 from the outer cylindrical portion 31c side of the piston plate 31. The distal end portion 52b slidably contacts the inner surface of the outer cylindrical portion 31c of the piston plate 31 in a state where the canceller member 5 is inserted into the canceller attachment portion M2. The second outer lip 52 is formed in a tapered cylindrical shape extending from the base end portion 52a toward the tip end portion 52b and toward the first annular plate portion 31a of the piston plate 31.

The distal end portion 52b of the second outer lip 52 has an annular outer holding portion 52c capable of holding a fluid in the recess over the entire circumference, as in the first outer lip 33 of the piston member 3. The inner surface of the outer holding portion 52c is constituted by a straight line portion SL3 extending straight from the bottom of the recess toward the first annular plate portion 31a side of the piston plate 31, and a curved line portion CL3 extending from the bottom of the recess toward the outer cylindrical portion 31c (the outer side surface 112 of the housing portion 11) side of the piston plate 31 and smoothly curved. The straight line portion SL3 is parallel (substantially parallel, not strictly parallel) to the inner surface (axis X) of the outer cylindrical portion 31c of the piston plate 31. The curved line portion CL3 is connected to one end (the bottom of the recess of the outer holding portion 52 c) of the straight line portion SL3 on the opposite side of the first annular plate portion 31a of the piston plate 31.

The outer holding portion 52c of the second outer lip 52 opens to the outer cylindrical portion 31c side of the piston plate 31 between the other end P5 of the piston plate 31 on the first annular plate portion 31a side in the straight portion SL3 and a tangent point P6 drawn from the other end P5 to a tangent line (broken line in fig. 5) of the curved portion CL 3. Therefore, the outer holding portion 52c can hold the fluid such as the assembly oil flowing in from the opening portion thereof inside the annular recess having the inner surface constituted by the straight line portion SL3 and the curved line portion CL 3.

The opening portion of the outer holding portion 52c of the second outer lip 52 is located within the range of the outer escape portion 31f formed at the distal end portion of the outer cylindrical portion 31c of the piston plate 31 in a plan view (not shown) viewed in the insertion direction of the eliminating member 5 into the eliminating attachment portion M2. In other words, in the outer holding portion 52c of the second outer lip 52, the straight line portion SL3 is located on the outer side (the side away from the axis X) than the inner surface of the outer cylindrical portion 31c of the piston plate 31, and the tangent point P6 on the curved portion CL3 is located on the inner side (the side closer to the axis X) than the end of the outer clearance portion 31f on the opposite side to the outer cylindrical portion 31c (the end of the inner side of the first outer extending portion 31 e).

[ Assembly work of eliminating Member ]

When inserting the canceller member 5 into the canceller mounting portion M2, the worker applies the mount oil in advance to the outside escape portion 31f of the piston plate 31 and the distal end portion 52b of the second outside lip 52, for example. Thereby, the fitting oil flows into the inside of the outer holding portion 52c of the second outer lip 52. When the worker moves the cancellation member 5 to the insertion opening of the cancellation mounting portion M2, the distal end portion 52b of the second outer lip 52 of the cancellation member 5 abuts against the outer escape portion 31f (R surface) of the piston plate 31. In addition, while the distal end portion 52b is being pushed into the interior of the cancel mounting portion M2 while being in contact with the outside escape portion 31f, the distal end portion 52b is elastically deformed, and thus the open ends of the outside holding portion 52c (corresponding to the other end P5 and the tangent point P6 described above) are in contact with the outside escape portion 31 f. Thus, a gap formed by the outer holding portion 52c is formed between the contact surfaces of the outer receding portion 31f and the distal end portion 52b, and the fitting oil applied in advance is held in the gap. When the eliminating member 5 is further pressed in this state, the fitting oil held in the outer holding portion 52c of the second outer lip 52 is supplied between the contact surfaces. Thus, even if the area of the contact surface is large, the oil film is hard to break, and the contact surface can be maintained in a lubricated state. Therefore, an increase in resistance (load) received by the distal end portion 52b of the second outer lip 52 from the outer escape portion 31f can be suppressed, and curling of the distal end portion 52b can be reliably avoided. Further, since the opening portion of the outer holding portion 52c is located within the range of the outer relief portion 31f in a plan view seen from the insertion direction of the canceller member 5, the mounting oil in the outer holding portion 52c can be reliably supplied between the contact surfaces.

[ modified examples ]

In the present embodiment, the case where the straight line portions SL1 to SL3 constituting a part of the inner surfaces of the holding

portions

32c, 33c, and 52c are parallel to the axis X has been described. However, the straight portions may also be inclined with respect to the axis X. For example, if the straight portions are inclined in a direction away from the opening portion as they go to the bottom of the recess of each of the holding

portions

32c, 33c, 52c, the amount of fluid that can be held can be increased. In addition, the straight line portion may be set to be a curved line.

In the clutch piston mechanism 1 of the present embodiment, the case where the holding

portions

32c, 33c, and 52c are formed on all of the inner lip 32 and the first outer lip 33 of the piston member 3, and the second outer lip 52 of the cancellation member 5 has been described. However, the holding portion may be formed on at least one of the three lips. In this case, too, there is an effect of reducing a portion where curling of the lip is likely to occur. As an example, the piston member 3 may be combined in reverse such that the inner lip 32 formed with the holding portion 32c seals the inner peripheral portion of the piston plate 31, and the outer lip not formed with the holding portion, a known O-ring, or the like seals the outer peripheral portion of the piston plate 31. Even when both the inner peripheral portion and the outer peripheral portion of the piston plate 31 are sealed with a lip having no holding portion formed thereon, a known O-ring, or the like, the portion where the lip can be curled can be reduced by using the second outer lip 52 having the holding portion 52c formed thereon for the canceller member 5.

In the present embodiment, the piston member 3 and the cancellation member 5 of the clutch piston mechanism 1 used in the automatic transmission for a vehicle are described as an application example of the lip-equipped plate member according to the present invention, but the lip-equipped plate member may be applied to various machines other than the clutch piston mechanism.

Although the preferred embodiments of the present invention and the modifications thereof have been described above, the present invention is not limited to the above embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

Description of the symbols

1 … clutch piston mechanism, 3 … piston member, 5 … canceling member, 7 … return spring, 11 … accommodating portion, 12, 13 … retreating portion, 31 … piston plate, 31f … outer retreating portion, 32 … inner lip, 32a, 33a, 52a … base end portion, 32b, 33b, 52b … tip end portion, 32C … inner holding portion, 33C, 52C … outer holding portion, 33 … first outer lip, 51 … canceling plate, 52 … second outer lip, 111 … accommodating portion inner side surface, 111C … inner retreating portion, 112 … accommodating portion outer side surface, 112C … outer retreating portion, 113 … accommodating portion bottom surface, a … first direction, C … multiple disc clutch, CL1 to CL3 … curved line portion, M1 … canceling piston SL, M2 … canceling portion SL, SL1 to 3 …, X … linear portion axis.

Claims

1. A lipped panel inserted into an annular groove-shaped mounting portion via an insertion opening having a relief portion, the lipped panel comprising:

an annular plate; and

a lip provided on at least one of an inner peripheral portion and an outer peripheral portion of the plate, the lip having a base end portion fixed to the plate and a tip end portion slidably contacting a side surface of the mounting portion, the lip having a tapered cylindrical shape and having a diameter expanding from the base end portion to the tip end portion and extending toward a bottom surface of the mounting portion,

the tip end portion of the lip has a holding portion capable of holding a fluid inside a recess over the entire circumference.

2. The lipped sheet member of claim 1,

the lip is an inner lip provided on an inner peripheral portion of the plate, the base end portion is fixed to the inner peripheral portion of the plate, and the tip end portion is in slidable contact with an inner side surface of the mounting portion,

the opening portion of the holding portion in the inner lip is located within a range of an inner relief portion, which is a radially inner portion of the relief portion, in a plan view seen from a plate member insertion direction in a state before insertion.

3. The lipped sheet member of claim 1,

the lip is an outer lip provided on an outer peripheral portion of the plate, the base end portion is fixed to the outer peripheral portion of the plate, and the tip end portion is in slidable contact with an outer side surface of the mounting portion,

the opening portion of the holding portion in the outer lip is located within a range of an outer escape portion, which is a radially outer portion of the escape portion, in a plan view seen from a plate member insertion direction in a state before insertion.

4. The lipped sheet member of claim 1,

the lips are respectively provided on an inner peripheral portion and an outer peripheral portion of the plate,

the lip provided on the inner peripheral portion is an inner lip having a base end portion fixed to the inner peripheral portion of the plate and a tip end portion slidably contacting an inner side surface of the mounting portion,

an opening portion of the holding portion in the inner lip is located within a range of an inner receding portion, which is a radially inner portion of the receding portion, in a plan view viewed from a plate member insertion direction in a state before insertion,

the lip provided on the outer peripheral portion is an outer lip having the base end portion fixed to the outer peripheral portion of the plate and the tip end portion slidably contacting an outer side surface of the mounting portion,

5. The lipped sheet member according to any one of claims 1 to 4,

the plate is a piston plate of a piston member in a clutch piston mechanism, the clutch piston mechanism comprising: an annular piston member that moves in a first direction by the hydraulic pressure of the hydraulic chamber and presses the clutch plate; an annular cancellation member that is disposed on the first direction side of the piston member and that restricts movement of the piston member in the first direction; and a biasing member that is provided between the piston member and the cancellation member and biases the piston member in a second direction opposite to the first direction.

6. The lipped sheet member according to any one of claims 1 to 4,

the plate is a cancel plate of a cancel member in a clutch piston mechanism, the clutch piston mechanism including: an annular piston member that moves in a first direction by the hydraulic pressure of the hydraulic chamber and presses the clutch plate; an annular cancellation member that is disposed on the first direction side of the piston member and that restricts movement of the piston member in the first direction; and a biasing member that is provided between the piston member and the cancellation member and biases the piston member in a second direction opposite to the first direction.