JP7372842B2 - Plate member with lip and canceller member - Google Patents

Description

The present invention relates to a plate member with a lip that is inserted into an annular groove-shaped mounting portion, and particularly to a plate member with a lip that can be applied to a clutch piston mechanism that operates a clutch.

Generally, in a clutch piston mechanism used in an automatic transmission (including a continuously variable transmission), a piston member reciprocates by hydraulic pressure in a hydraulic chamber. The reciprocating movement of the piston member engages or disengages the multi-disc clutch, thereby shifting the speed of the vehicle. As an example of a conventional piston member, a piston seal for an automatic transmission described in Patent Document 1 is known. The piston seal for an automatic transmission (hereinafter referred to as a "piston member") described in Patent Document 1 is disposed inside a bottomed cylindrical cylinder, and is connected to a pressurized chamber (hereinafter referred to as a "hydraulic member") between the cylinder and the cylinder. It forms a "chamber"). This piston member has a piston plate made of a metal plate, and an inner circumference seal lip made of a rubber-like elastic body is fixed to the inner circumference of the piston plate. An outer seal lip made of a rubber-like elastic body is fixed to the outer circumference of the piston plate.

Japanese Patent Application Publication No. 2010-190391

By the way, in the clutch piston mechanism as described above, when the piston member is inserted into the cylinder, the tips of the inner seal lip and the outer seal lip of the piston member come into contact with the end surface of the insertion port of the cylinder. The insertion opening of the cylinder generally has a relief section formed by chamfering the corner of the opening end obliquely. Therefore, when the tip end of each seal lip of the piston member is pushed into the cylinder, it receives a resistance force (load) from the relief part of the cylinder. When this resistance force increases, the tip side portion of the seal lip of the piston member tends to turn outward in a direction opposite to the insertion direction. Therefore, it may be necessary to devise ways to avoid the seal lip from turning over during assembly to the cylinder. Such measures may be similarly sought for the seal lip of the canceller member (BCS) provided in the clutch piston mechanism to cancel centrifugal oil pressure during high speed rotation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a plate member with a lip that can reliably prevent the lip from turning over during assembly.

According to one aspect of the present invention, there is provided a plate member with a lip that is inserted into the mounting portion through an insertion port having a relief portion in the annular groove-shaped mounting portion. This plate member with a lip includes an annular plate and a lip provided on at least one of the inner circumference and the outer circumference of the plate. The lip has a proximal end fixed to the plate and a distal end slidably in contact with the side surface of the mounting section, and the lip increases in diameter from the proximal end toward the distal end and extends toward the bottom side of the mounting section. . The tip of the lip has a holding portion that can hold the fluid inside the recess over the entire circumference.

According to one aspect of the present invention, it is possible to provide a plate member with a lip that can reliably prevent the lip from turning over during assembly.

FIG. 2 is a sectional view of a main part showing the configuration of a clutch piston mechanism to which a plate member with a lip according to an embodiment of the present invention is attached. FIG. 3 is an enlarged cross-sectional view including the inner lip of the piston member before insertion. FIG. 3 is a partial plan view showing the positional relationship between the opening portion of the inner lip and the release portion of the mounting portion when viewed from direction B shown in FIG. 2; FIG. 3 is an enlarged cross-sectional view including the first outer lip of the piston member before insertion. FIG. 6 is an enlarged cross-sectional view including the second outer lip of the canceller member before insertion.

[Schematic configuration of clutch piston mechanism]
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a plate member with a lip according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view of a main part showing the configuration of a clutch piston mechanism equipped with a plate with a lip according to an embodiment of the present invention. A clutch piston mechanism 1 shown in FIG. 1 is mainly used in automatic transmissions for vehicles, and is configured to be housed in a housing section 11 of a housing 10 together with a multi-disc clutch C to engage and disengage the multi-disc clutch C. has been done. The accommodating portion 11 is formed in the shape of an annular groove surrounding the periphery of the axis X of the housing 10 (centered on the axis X). In this specification, the side closer to axis .

The accommodating portion 11 is formed as a space partitioned by an inner side surface 111, an outer side surface 112, and a bottom surface 113 connecting the ends 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 accommodating part 11 are surfaces parallel to the axis X, and the bottom surface 113 of the accommodating part 11 is a surface perpendicular to the axis X. Note that the inner side surface 111 and the outer side surface 112 do not need to be strictly parallel as long as they are generally parallel to the axis X, and the bottom surface 113 does not need to be strictly perpendicular as long as it is generally perpendicular to the axis X.

The inner side surface 111 of the accommodating portion 11 includes a first inner side surface 111a located on the side closer to the bottom surface 113, and a second inner side surface 111b located on the side farther from the bottom surface 113 and on the inside of the first inner side surface 111a. It is formed as a stepped surface having . Further, the outer side surface 112 of the housing portion 11 includes a first outer side surface 112a located on a side closer to the bottom surface 113, and a second outer side surface 112a located on a side farther from the bottom surface 113 and outside of the first outer side surface 112a. It is formed as a stepped surface having a side surface 112b. Note that the multi-disc clutch C is arranged in a region corresponding to the second outer side surface 112b of the housing portion 11.

The space defined by the first inner side surface 111a, the first outer side surface 112a, and the bottom surface 113 of the accommodating portion 11 is capable of mounting a piston member 3, which will be described later, of the clutch piston mechanism 1. A hydraulic chamber 20 is formed. Hereinafter, the area (space) within the accommodating section 11 that serves as the mounting section for the piston member 3 will be referred to as a "piston mounting section 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 port opened on the side opposite to the bottom surface 113 of the piston mounting portion M1.

A relief portion 12 is formed in the insertion opening of the piston mounting portion M1. The relief portion 12 has an inner relief portion 111c that is a radially inner portion and an outer relief portion 112c that is a radially outer portion. The inner relief portion 111c is formed by cutting off (chamfering) the corner at the opening end of the first inner side surface 111a diagonally. The second inner side surface 111b is connected to the end of the inner relief portion 111c on the opposite side to the first inner side surface 111a. In other words, the stepped portion of the inner side surface 111 is constituted by the inner relief portion 111c. Further, the outer relief portion 112c is formed by cutting off (chamfering) the corner of the opening end of the first outer side surface 112a diagonally. An outer end of a step surface 112d extending radially outward from an end of the outer relief portion 112c opposite to the first outer side 112a is connected to the second outer side 112b. In other words, the stepped portion of the outer side surface 112 is composed of the outer relief portion 112c and the stepped surface 112d.

Clutch piston mechanism 1 includes a piston member 3, a canceller member 5, and a return spring 7. In this embodiment, the piston member 3 and the canceller member 5 correspond to the "lip member" according to the present invention, and the return spring 7 corresponds to the "biasing member" according to the present invention.

The piston member 3 includes a piston plate 31 made of a metal material and formed in an annular shape as a whole, an inner lip 32 provided on the inner circumference of the piston plate 31, and a first outer lip provided on the outer circumference of the piston plate 31. 33, and constitutes a so-called "bonded 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) within the piston mounting portion M1 in the direction of the axis X of the housing 10 (the direction in which the axis X extends). Note that the center line of the piston member 3 only needs to roughly match the axis X of the housing 10, and does not need to match exactly.

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

The first annular plate portion 31a faces the bottom surface 113 of the housing portion 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 housing 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 housing portion 11. The first inwardly extending portion 31d extends inward from the tip (lower end in FIG. 1) of the inner cylindrical portion 31b in a flange shape. A gap is also provided between the end of the first inwardly extending portion 31d and the first inner side surface 111a of the housing portion 11. The first outwardly extending portion 31e extends in the shape of a flange from the tip (the lower end in FIG. 1) of the outer cylindrical portion 31c toward the outside (specifically, the second outer side surface 112b of the accommodating portion 11). There is. The outer cylindrical portion 31c and the first outwardly extending portion 31e are located above the multi-disc clutch C. The piston plate 31 may be formed, for example, by subjecting a rolled steel plate to press working or the like.

The inner lip 32 seals the gap between the inner peripheral part of the piston plate 31 (specifically, the end of the first inwardly extending part 31d) and the first inner side surface 111a of the housing part 11. . Further, 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 accommodating portion 11. In addition, in the piston member 3 of this 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 made of synthetic rubber such as nitrile rubber (NBR), acrylic rubber (ACM), silicone rubber (VMQ), or fluorine rubber (FKM), and are formed as a so-called lip seal. There is. The tip of the inner lip 32 is in contact with the first inner side surface 111a of the housing section 11, and slides along the first inner side surface 111a of the housing section 11 as the piston member 3 moves. The tip of the first outer lip 33 is in contact with the first outer side surface 112a of the housing section 11, and slides along the first outer side surface 112a of the housing section 11 as the piston member 3 moves. Therefore, the inner lip 32 is always in contact with the first inner side surface 111a of the accommodating section 11, and the first outer lip 33 is always in contact with the first outer side surface 112a of the accommodating section 11. A sealed hydraulic chamber 20 is formed between the bottom surface 113 of the piston member 11 and the piston member 3. In other words, the hydraulic chamber 20 is a space closer to the bottom surface 113 than the piston member 3 in the piston mounting portion M1. Note that the detailed shapes of the inner lip 32 and the first outer lip 33 will be described later.

One end of an operating passage 21 for supplying hydraulic oil to the hydraulic chamber 20 is opened at a portion of the first inner side surface 111a of the housing portion 11 on the bottom surface 113 side. The piston member 3 is moved in a direction away from the bottom surface 113 of the housing portion 11 (in the direction of arrow A in FIG. 1) by the hydraulic pressure of the hydraulic oil supplied to the hydraulic chamber 20, and the first outwardly extending portion 31e is connected to the multi-disc clutch. The multi-disc clutch C is configured to be engaged by pressing the clutch plate C1 on the drive side of the multi-disc clutch C. Note that in this embodiment, the direction of arrow A corresponds to the "first direction" according to the present invention.

The canceller member 5 is disposed on the opposite side of the bottom surface 113 of the accommodating portion 11 with respect to the piston member 3 (that is, on the side of the piston member 3 in the direction of arrow A). Specifically, the canceller member 5 is generally spaced apart from the first annular plate portion 31a and the inwardly extending portion 31d of the piston plate 31 in the direction away from the bottom surface 113 of the accommodating portion 11. ing.

The canceller member 5 includes a cancel plate 51 made of a metal material and formed in an annular shape as a whole, and a second outer lip 52 provided on the outer periphery of the cancel plate 51, and is a so-called "bonded canceller seal (BCS)". ”. The center line of the canceller member (BCS) 5 coincides with the axis X of the housing 10 (as long as it roughly 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 (51a-51c) are integrally formed.

The second annular plate portion 51a is located on the arrow A direction side of the first annular plate portion 31a, the inner cylindrical portion 31b, and the inwardly extending portion 31d of the piston plate 31. Specifically, the second annular plate portion 51a faces the first annular plate portion 31a and the inwardly 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 between the inner cylindrical portion 31b and the outer cylindrical portion 31c of the piston plate 31 in the radial direction. The second outwardly extending portion 51c extends outward from the distal end (in FIG. 1, the upper end) of the intermediate cylindrical portion 51b, more specifically, toward the inner surface of the outer cylindrical portion 31c of the piston plate 31 in the shape of a flange. It extends to 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 housing 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, for example, by performing press working on a rolled steel plate.

The second outer lip 52 seals the gap between the outer circumference of the cancel plate 51 (specifically, the end 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 is formed as a so-called lip seal, for example, like the inner lip 32 and first outer lip 33 of the piston member 3. The tip of the second outer lip 52 is in contact with 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 canceller member 5 of this embodiment, the second outer lip 52 corresponds to the "outer lip" of the "canceller member" according to the present invention.

Further, movement of the canceller member 5 in the direction of arrow A is restricted by a stopper ring 53. The stopper ring 53 is in contact with a portion of the second annular plate portion 51a of the cancel plate 51 that is inside the convex portion 51d on the surface opposite to the bottom surface 113 of the storage portion 11, and is attached to the second inner side surface of the storage portion 11. 111b. The stopper ring 53 restricts the movement of the canceller member 5 in the direction of the arrow A by abutting a surface on the bottom surface 113 side of the housing portion 11 with a portion inside the convex portion 51d of the second annular plate portion 51a. Movement of the canceller member 5 in the radial direction is restricted by contacting the outer peripheral surface of the canceller member 5 with the side surface of the convex portion 51d.

A canceller hydraulic chamber 22 is formed between the piston member 3 and the canceller member 5. In other words, the canceller member 5 cooperates with the piston member 3 to form the canceller hydraulic chamber 22 . When the housing 10 and the like rotate at high speed when the multi-disc clutch C is released, centrifugal oil pressure is generated in the oil pressure chamber 20 by the hydraulic oil remaining in the oil pressure chamber 20, and the piston member 3 is moved in the direction of arrow A by the force of the generated centrifugal oil pressure. There is a risk that the multi-plate clutch C may be engaged due to the movement. The canceller hydraulic chamber 22 is provided to suppress the influence of centrifugal hydraulic pressure generated within the hydraulic chamber 20. Specifically, a predetermined amount of oil is stored in the canceller hydraulic chamber 22, so that when centrifugal hydraulic pressure is generated in the hydraulic chamber 20, centrifugal hydraulic pressure is also generated in the canceller hydraulic chamber 22. . As a result, a force opposing the force due to the centrifugal hydraulic pressure generated within the hydraulic chamber 20 acts on the piston member 3, and the influence of the centrifugal hydraulic pressure generated within the hydraulic chamber 20 is suppressed.

The mounting portions of the canceller member 5 that enable the formation of the canceler hydraulic chamber 22 include the piston plate 31 of the piston member 3 (specifically, the first annular plate portion 31a, the inner cylindrical portion 31b, the outer cylindrical portion 31c, and the third cylindrical portion 31c). 1 inwardly extending portion 31d), the inner lip 32, and the inner side surface 111 of the housing portion 11 (specifically, the first inner side surface 111a, the second inner side surface 111b, and the inner relief portion 111c). is applicable. In the following description, the area (space) within the accommodating section 11 that serves as the mounting section for the canceller member 5 will be referred to as a "canceller mounting section M2."

The canceller member 5 is inserted into the canceller mounting part M2 through an insertion opening opened on the side opposite to the first annular plate part 31a in the canceller mounting part M2. A relief part 13 similar to the piston mounting part M1 is formed in the insertion opening of the canceller mounting part M2. The relief portion 13 has an outer relief portion 31f formed at the tip (lower end in FIG. 1) of the outer cylindrical portion 31c of the piston plate 31. The outer relief portion 31f is formed by rounding (R chamfering) the inner corner where the outer cylindrical portion 31c of the piston plate 31 and the first outwardly extending portion 31e are connected.

The return spring 7 is provided between the piston member 3 and the canceller member 5. The return spring 7 urges the piston member 3 and the canceller member 5 in a direction to separate them from each other. In other words, the return spring 7 urges the piston member 3 in the direction opposite to the arrow A direction. Specifically, the return spring 7 urges the piston member 3 in a direction toward the bottom surface 113 of the housing portion 11 . Therefore, in this embodiment, the direction opposite to the direction of arrow A (the direction approaching the bottom surface 113 of the accommodating 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 this embodiment will be explained with reference to FIGS. 2 to 4, focusing on the inner lip 32 and the first outer lip 33.

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 the positional relationship between an opening portion of an inner holding portion 32c (described later) of the inner lip 32 and an inner relief portion 111c of the accommodating portion 11, as viewed from direction B shown in FIG. 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.

The inner lip 32 of the piston member 3 has a base end 32a and a tip end 32b, as shown in FIG. The base end portion 32a is fixed so as to cover the end portion of the first inwardly extending portion 31d of the piston plate 31 from the inner side surface 111 side of the housing portion 11. The tip portion 32b slidably contacts the first inner side surface 111a of the housing portion 11 (piston mounting portion M1) when the piston member 3 is inserted into the piston mounting portion M1. The inner lip 32 is formed into a tapered cylindrical shape extending toward the bottom surface 113 of the housing portion 11 .

The tip portion 32b of the inner lip 32 has an annular inner holding portion 32c which is recessed around the entire circumference and is capable of holding fluid inside. The inner surface of the inner holding portion 32c has a straight line portion SL1 extending linearly from the bottom of the recess toward the bottom surface 113 of the accommodating portion 11, and a smooth linear portion SL1 extending from the bottom of the recess toward the inner side surface 111 of the accommodating portion 11. It is composed of a curved portion CL1 that curves inward. The straight line portion SL1 is parallel to the first inner side surface 111a (axis X) of the housing portion 11 (as long as it is approximately parallel, it does not need to be strictly parallel). The curved portion CL1 is connected to one end of the straight portion SL1 on the side opposite to the bottom surface 113 of the accommodating portion 11 (the bottom of the recess of the inner holding portion 32c).

The inner holding portion 32c of the inner lip 32 connects the other end P1 of the straight portion SL1 on the bottom surface 113 side of the accommodating portion 11 with a contact point P2 of a tangent line (broken line in FIG. 2) drawn from the other end P1 to the curved portion CL1. In between, the housing part 11 is opened to the inner side surface 111 side. Therefore, the inner holding part 32c can hold the fluid such as assembly oil flowing from the opening part of the inner holding part 32c inside the annular recess having the inner surface formed by the straight part SL1 and the curved part CL1.

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

The first outer lip 33 of the piston member 3 has a base end 33a and a tip end 33b, as shown in FIG. The base end portion 33a is fixed so as to cover the outer peripheral side 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. The tip portion 33b slidably contacts the first outer side surface 112a of the accommodating portion 11 (piston mounting portion M1) when the piston member 3 is inserted into the piston mounting portion M1. The first outer lip 33 is formed into a tapered cylindrical shape that increases in diameter from the base end 33a toward the distal end 33b and extends toward the bottom surface 113 of the housing portion 11.

The distal end portion 33b of the first outer lip 33, like the inner lip 32, has an annular outer holding portion 33c that is recessed around the entire circumference and is capable of holding fluid inside. The inner surface of the outer holding portion 33c has a straight line portion SL2 extending linearly from the bottom of the recess toward the bottom surface 113 of the housing portion 11, and a smooth straight portion SL2 extending from the bottom of the recess toward the outer side surface 112 of the housing portion 11. It is composed of a curved portion CL2 that curves inward. The straight line portion SL2 is parallel to the first outer side surface 112a (axis X) of the housing portion 11 (as long as it is approximately parallel, it does not need to be strictly parallel). The curved portion CL2 is connected to one end of the straight portion SL2 on the side opposite to the bottom surface 113 of the accommodating portion 11 (the bottom of the recess of the outer holding portion 33c).

The outer holding portion 33c of the first outer lip 33 has a contact point P4 between the other end P3 on the bottom surface 113 side of the housing portion 11 in the straight portion SL2 and a tangent line (broken line in FIG. 3) drawn from the other end P3 to the curved portion CL2. It opens on the outer side surface 112 side of the housing portion 11 between the housing portion 11 and the housing portion 11 . Therefore, the outer holding portion 33c can hold the fluid such as assembly oil flowing from the opening thereof inside the annular recess having the inner surface formed by the straight portion SL2 and the curved portion CL2.

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

[Piston member assembly work]
By the way, in the conventional clutch piston mechanism, the slope of the chamfered surface (in other words, the sloped surface or the tapered surface) at the relief part of the insertion port of the piston mounting part and the slope of the tip (contact surface) of each lip of the piston member are different. In many cases, they were at almost the same angle. In such a case, the area of the contact surface between the relief portion and the tip end of the lip when the piston member is inserted becomes larger. This contact surface is normally kept in a lubricated state by supplying assembly oil, etc., but as the area of the contact surface becomes larger, the oil film tends to break and it becomes difficult to maintain a lubricated state. In such a state, the resistance force (load) that the tip end of each seal lip receives from the relief portion of the cylinder increases, which may cause the tip end portion of the seal lip to curl up.

On the other hand, in this embodiment, when inserting the piston member 3 having the inner lip 32 and the first outer lip 33 into the piston mounting part M1, the operator, for example, Assembling oil is applied in advance to each relief portion 111c, 112c of 112 and each tip end portion 32b, 33b of inner lip 32 and first outer lip 33. As a result, the assembly oil flows into the respective holding portions 32c and 33c of the inner lip 32 and the first outer lip 33. Then, when the operator moves the piston member 3 to the insertion opening of the piston mounting portion M1, the tip portion 32b of the inner lip 32 of the piston member 3 comes into contact with the inner relief portion 111c on the inner side surface 111 of the housing portion 11, and The tip portion 33b of the first outer lip 33 of the piston member 3 contacts the outer relief portion 112c on the outer side surface 112 of the housing portion 11. At this time, as described above, if the inclination of the chamfered surface of each relief part 111c, 112c and the inclination of each tip part 32b, 33b of the inner lip 32 and the first outer lip 33 are approximately the same angle, each The relief portions 111c, 112c and the respective tip portions 32b, 33b come into contact over a wide area. However, in this embodiment, a gap is formed between the contact surfaces by the inner holding part 32c of the inner lip 32 and the outer holding part 33c of the first outer lip 33, and each gap is filled with a pre-applied material. The assembly oil will be retained. In this state, when the tips 32b, 33b of the inner lip 32 and the first outer lip 33 are pushed into the piston mounting portion M1 while contacting the relief portions 111c, 112c, the tips 32b, 33b of the inner lip 32 and the first outer lip 33 are pushed into the piston mounting portion M1. The assembly oil held in the holding parts 32c and 33c is supplied between the contact surfaces. As a result, even if the area of the contact surface is large, the oil film is difficult to break, and the contact surface can be kept in a lubricated state. Therefore, it is possible to suppress an increase in the resistance force (load) that the tips 32b and 33b of the inner lip 32 and the first outer lip 33 receive from the release parts 111c and 112c, and ensure that the tips 32b and 33b are not turned over. It becomes possible to avoid this.

The effect of the holding portions 32c, 33c of the respective tip portions 32b, 33b as described above is obtained when the slope of the chamfered surface of each relief portion 111c, 112c and the slope of each tip portion 32b, 33b are approximately the same angle. Not only. For example, the same effect can be obtained when the inclination of each of the tip portions 32b and 33b (the included angle between the axis X and the contact surface) is larger than the inclination of each relief portion 111c and 112c (the included angle between the axis X and the chamfered surface). is obtained. In this case, each of the tips 32b and 33b of the inner lip 32 and the first outer lip 33 is connected to the open end on the side far from the bottom surface 113 of the housing part 11 (the contact point P2 , P4) contact each relief portion 111c, 112c first. Then, in the process in which the tip portions 32b, 33b are pushed into the piston mounting portion M1 while contacting the release portions 111c, 112c, the tip portions 32b, 33b are elastically deformed, so that the housing portion 11 is The open end on the side closer to the bottom surface 113 (corresponding to the other ends P1 and P3 described above) abuts on each relief portion 111c and 112c. In this way, even when the open end portions of each holding part 32c, 33c are in contact with each relief part 111c, 112c, the assembly oil held in each holding part 32c, 33c is supplied between the contact surfaces of each other. Therefore, it is possible to reliably avoid turning up the respective tip portions 32b and 33b.

Furthermore, in the present embodiment, the opening portions of each of the holding portions 32c and 33c are located within the range of each relief portion 111c and 112c in a plan view from the insertion direction of the piston member 3. Thereby, the assembly oil held inside each of the holding parts 32c, 33c is reliably supplied between the mutual contact surfaces of each relief part 111c, 112c and each tip part 32b, 33b. Therefore, it becomes possible to more reliably prevent the tip portions 32b, 33b of the inner lip 32 and the first outer lip 33 from turning over.

[Detailed structure of canceller component]
Next, the detailed structure of the canceller member 5 in this embodiment will be described with reference to FIG. 5, focusing on the second outer lip 52. FIG. 5 is an enlarged sectional view showing the vicinity of the second outer lip 52 of the canceller member 5 in a state before the canceller member 5 is inserted into the canceller mounting portion M2.

The second outer lip 52 of the canceller member 5 has a base end 52a and a tip end 52b, as shown in FIG. The base end portion 52a is fixed so as to cover the end portion of the second outwardly extending portion 51c of the cancel plate 51 from the outer cylindrical portion 31c side of the piston plate 31. The tip portion 52b slidably contacts the inner surface of the outer cylindrical portion 31c of the piston plate 31 when the canceller member 5 is inserted into the canceler mounting portion M2. The second outer lip 52 is formed in a tapered cylindrical shape that increases in diameter from the base end 52a toward the distal end 52b and extends toward the first annular plate 31a of the piston plate 31.

The tip portion 52b of the second outer lip 52, like the first outer lip 33 of the piston member 3, has an annular outer holding portion 52c that is recessed over the entire circumference and is capable of holding fluid inside. The inner surface of the outer holding portion 52c includes a straight portion SL3 that extends linearly from the bottom of the recess toward the first annular plate portion 31a of the piston plate 31, and a straight portion SL3 extending linearly from the bottom of the recess toward the outer cylindrical portion 31c of the piston plate 31 (accommodating The curved portion CL3 extends toward the outer side surface 112) of the portion 11 and curves smoothly. The straight line portion SL3 is parallel to the inner surface (axis X) of the outer cylindrical portion 31c of the piston plate 31 (as long as it is approximately parallel, it does not need to be strictly parallel). The curved portion CL3 is connected to one end of the straight portion SL3 on the side opposite to the first annular plate portion 31a of the piston plate 31 (the bottom of the recess of the outer holding portion 52c).

The outer holding portion 52c of the second outer lip 52 is connected to the other end P5 of the piston plate 31 on the first annular plate portion 31a side in the straight portion SL3, and to a tangent drawn from the other end P5 to the curved portion CL3 (broken line in FIG. 5). ) is open to the outer cylindrical portion 31c side of the piston plate 31 between the contact point P6 and the contact point P6 of the piston plate 31. Therefore, the outer holding portion 52c can hold fluid such as assembly oil flowing from its opening portion inside the annular recess having an inner surface formed by the straight portion SL3 and the curved portion CL3.

The opening portion of the outer holding portion 52c in the second outer lip 52 is located at the tip of the outer cylindrical portion 31c of the piston plate 31 in a plan view (not shown) seen from the insertion direction of the canceller member 5 into the canceller mounting portion M2. It is located within the range of the formed outer relief portion 31f. In other words, in the outer holding part 52c of the second outer lip 52, the straight line part SL3 is located on the outer side (the side farther from the axis X) than the inner surface of the outer cylindrical part 31c of the piston plate 31, and the straight part SL3 is located on the curved part CL3. The contact point P6 is located inside (closer to the axis X) the end of the outer relief portion 31f opposite to the outer cylindrical portion 31c (the inner end of the first outwardly extending portion 31e).

[Assembling work of canceller parts]
When inserting the canceller member 5 into the canceller mounting portion M2, the operator applies assembly oil to the outer relief portion 31f of the piston plate 31 and the tip portion 52b of the second outer lip 52 in advance, for example. As a result, the assembly oil flows into the outer holding portion 52c of the second outer lip 52. Then, when the operator moves the canceller member 5 to the insertion opening of the canceller mounting part M2, the tip 52b of the second outer lip 52 of the canceller member 5 comes into contact with the outer relief part 31f (R surface) of the piston plate 31. . In the process in which the tip portion 52b is pushed into the canceller mounting portion M2 while contacting the outer relief portion 31f, the tip portion 52b is elastically deformed, thereby causing each open end of the outer holding portion 52c (other than the above-mentioned (corresponding to the end P5 and the contact point P6) comes into contact with the outer relief portion 31f. As a result, a gap is formed by the outer holding part 52c between the mutual contact surfaces of the outer relief part 31f and the tip part 52b, and the pre-applied assembly oil is held in the gap. When the canceller member 5 is further pushed in in this state, the assembly oil held in the outer holding portion 52c of the second outer lip 52 is supplied between the contact surfaces. As a result, even if the area of the contact surface is large, the oil film is difficult to break, and the contact surface can be kept in a lubricated state. Therefore, it is possible to suppress an increase in the resistance force (load) that the tip portion 52b of the second outer lip 52 receives from the outer relief portion 31f, and it is possible to reliably avoid curling of the tip portion 52b. In addition, since the opening of the outer holding part 52c is located within the range of the outer relief part 31f in a plan view from the insertion direction of the canceller member 5, the assembly oil in the outer holding part 52c comes into contact with each other. It is possible to reliably supply it between the surfaces.

[Modified example]
In the present embodiment, a case has been described in which the straight line portions SL1 to SL3 forming part of the inner surface of each of the holding portions 32c, 33c, and 52c are parallel to the axis X. However, the straight portion may be inclined with respect to the axis X. For example, the amount of fluid that can be held can be increased by slanting the straight portions away from the opening portions toward the bottom of the recesses of each of the holding portions 32c, 33c, and 52c. Also, the straight line portion may be a curved line.

Furthermore, in the clutch piston mechanism 1 of the present embodiment, 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 canceller member 5. We have explained the case where However, at least one of the three lips may be formed with a holding portion. Even in this case, there is an effect that the number of locations where lip curling may occur is reduced. For example, with respect to the piston member 3, the inner circumference of the piston plate 31 is sealed with the inner lip 32 in which the holding part 32c is formed, and the outer circumference of the piston plate 31 is sealed with the lip 32 in which the holding part is not formed. It may be sealed with a well-known O-ring or the like, or the reverse combination is also possible. Furthermore, even when both the inner and outer circumferential parts of the piston plate 31 are sealed with a lip without a holding part or a well-known O-ring, the canceller member 5 has the holding part 52c formed thereon. If two outer lips 52 are used, it is possible to reduce the number of locations where lip curling may occur.

In addition, in this embodiment, the piston member 3 and canceller member 5 of the clutch piston mechanism 1 used in an automatic transmission for a vehicle have been described as an application example of the plate member with a lip according to the present invention. The plate member can also be applied to various machines other than clutch piston mechanisms.

Although some preferred embodiments and modifications thereof of the present invention 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. be.

DESCRIPTION OF SYMBOLS 1...Clutch piston mechanism, 3...Piston member, 5...Canceller member, 7...Return spring, 11...Accommodation part, 12, 13...Escape part, 31...Piston plate, 31f...Outer relief part, 32...Inner lip, 32a , 33a, 52a... Base end part, 32b, 33b, 52b... Tip part, 32c... Inner holding part, 33c, 52c... Outer holding part, 33... First outer lip, 51... Cancel plate, 52... Second outer lip , 111...Inner side surface of the accommodating part, 111c...Inner relief part, 112...Outer side surface of the accommodating part, 112c...Outer relief part, 113...Bottom surface of the accommodating part, A...First direction, C...Multi-plate clutch, CL1~ CL3...Curved part, M1...Piston mounting part, M2...Canceller mounting part, SL1~SL3...Straight line part, X...Axis line

Claims (3)

A plate member with a lip that is inserted into the mounting portion through an insertion port having a relief portion in the annular groove-shaped mounting portion,
a circular plate,
an inner lip provided on the inner circumference of the plate, the lip having a base end fixed to the inner circumference of the plate and a distal end slidably contacting the inner side surface of the mounting part; a tapered cylindrical inner lip that decreases in diameter from the base end toward the distal end and extends toward the bottom side of the mounting section;
including;
The tip of the inner lip has a holding part that is recessed around the entire circumference and can hold the fluid inside;
The opening portion of the holding portion in the inner lip is located within a range of an inner relief portion that is a radially inner portion of the relief portion in a plan view viewed from the plate member insertion direction in a state before insertion. are doing,
Plate member with lip. an outer lip provided on the outer periphery of the plate, the outer lip having a base end fixed to the outer periphery of the plate and a distal end slidably contacting the outer side surface of the attachment part; further comprising a tapered cylindrical outer lip that increases in diameter from the end toward the tip and extends toward the bottom side of the mounting section ,
The tip of the outer lip has a holding portion that is recessed around the entire circumference and can hold the fluid inside;
The opening portion of the holding portion in the outer lip is located within the range of the outer relief portion, which is a radially outer portion of the relief portion, in a plan view viewed from the plate member insertion direction in a state before insertion. are doing,
The lipped plate member according to claim 1. an annular piston member that moves in a first direction to press a clutch plate by hydraulic pressure in a hydraulic chamber; and an annular piston member that is disposed on the first direction side of the piston member and whose movement in the first direction is restricted. and a biasing member provided between the piston member and the canceller member and biasing the piston member in a second direction opposite to the first direction. A canceller member ,
An annular cancel plate,
an outer lip provided on the outer periphery of the cancel plate, the base end portion being fixed to the cancel plate; and an outer lip provided on the inner surface of the outer cylindrical portion extending in the first direction from the outer periphery of the annular plate portion of the piston member. a tapered cylindrical outer lip that has a distal end that is in slidable contact and that increases in diameter from the proximal end toward the distal end and extends toward the annular plate;
including;
The distal end portion of the outer lip is recessed over the entire circumference and has a holding portion capable of holding fluid inside the canceller member.