JP2010190391A - Piston seal for automatic transmission - Google Patents

Piston seal for automatic transmission Download PDF

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Publication number
JP2010190391A
JP2010190391A JP2009037986A JP2009037986A JP2010190391A JP 2010190391 A JP2010190391 A JP 2010190391A JP 2009037986 A JP2009037986 A JP 2009037986A JP 2009037986 A JP2009037986 A JP 2009037986A JP 2010190391 A JP2010190391 A JP 2010190391A
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Japan
Prior art keywords
inner peripheral
piston member
seal lip
cylinder
bps
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Pending
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JP2009037986A
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Japanese (ja)
Inventor
Kiichiro Goto
喜一郎 後藤
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Nok Corp
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Nok Corp
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Priority to JP2009037986A priority Critical patent/JP2010190391A/en
Publication of JP2010190391A publication Critical patent/JP2010190391A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
    • F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
    • F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
    • F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
    • F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/08—Details or arrangements of sealings not provided for in group F16D3/84

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide BPS including a piston member fixing a seal lip without stress concentration on a seal lip back surface during pressure actuation and suppressing rise of manufacturing cost. <P>SOLUTION: In a piston seal for an automatic transmission including a piston member 20 displacing in a bottomed cylindrical-shaped cylinder in an axial direction and defining a pressurizing chamber with the cylinder, a tapered chamfer part 50 is formed at a inner circumference side end part 24 of the piston member 20 on which an inner circumference lip seal 41 projecting to the pressurizing chamber side and slidably adhering on an cylinder inner circumference surface is fixed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、自動車の自動変速機でクラッチ締結に使用される自動変速機用ピストンシール（以下「ＢＰＳ」という。）に関する。更に詳しくは、ＢＰＳを構成するピストン部材の形状に関する。   The present invention relates to an automatic transmission piston seal (hereinafter referred to as “BPS”) used for clutch engagement in an automatic transmission of an automobile. More specifically, the present invention relates to the shape of the piston member constituting the BPS.

図３は、従来技術によるＢＰＳを軸心Ｏを通る平面で切断して示す概略断面図、図４は、図３における内周シールリップ部がピストン部材に固着された状態を示す拡大図である。この図に示す通り、ＢＰＳ１００は略コ字形状を呈する有底円筒形状のシリンダ１０１内部に配設され、シリンダ１０１とで加圧室Ｍを画成している。このＢＰＳ１００を挟んで加圧室Ｍと軸方向反対側にはキャンセルプレート１２１が配設されていて、ＢＰＳ１００及びキャンセルプレート１２１とで均衡油室Ｎを形成している。また、ＢＰＳ１００の外周であって加圧室Ｍと軸方向反対側には多板クラッチ１３２が配設されており、均衡油室Ｎ内には、加圧室Ｍが加圧されることにより多板クラッチ１３２を押圧したＢＰＳ１００を押し戻すように機能するリターンスプリング１３１が配設されていて、これらによりクラッチ締結が行われている。   3 is a schematic cross-sectional view showing a BPS according to the prior art cut along a plane passing through the axis O, and FIG. 4 is an enlarged view showing a state in which the inner peripheral seal lip portion in FIG. 3 is fixed to the piston member. . As shown in this figure, the BPS 100 is disposed inside a bottomed cylindrical cylinder 101 having a substantially U-shape, and defines a pressurizing chamber M with the cylinder 101. A cancel plate 121 is disposed on the opposite side of the pressurizing chamber M in the axial direction across the BPS 100, and the balanced oil chamber N is formed by the BPS 100 and the cancel plate 121. Further, a multi-plate clutch 132 is disposed on the outer periphery of the BPS 100 on the opposite side of the pressurizing chamber M in the axial direction, and in the balanced oil chamber N, the pressurizing chamber M is pressurized to increase the amount. A return spring 131 that functions to push back the BPS 100 that pressed the plate clutch 132 is provided, and the clutch is engaged by these.

ＢＰＳ１００を構成するピストン部材１１１は、鋼板等の金属板を打ち抜きプレスで成形したものであって、ＢＰＳ１００は上述したようにシリンダ１０１とで加圧室Ｍを画成し作用圧力を保持するため、ピストン部材１１１の内周筒部１１２から内周方向に延びる内周フランジ部１１３には、シリンダ１０１の内周筒部と摺動自在に密接するゴム状弾性体からなる内周シールリップ１４１が固着され、ピストン部材１１１のフランジ部１１４の外周側角部には、加圧室Ｍ側へ向けて突出しシリンダ１０１の外周筒部と摺動自在に密接するゴム状弾性体からなる外周シールリップ１４２が固着されている（下記特許文献１を参照）。   The piston member 111 constituting the BPS 100 is formed by punching a metal plate such as a steel plate with a press. Since the BPS 100 defines the pressurizing chamber M with the cylinder 101 as described above, An inner peripheral seal lip 141 made of a rubber-like elastic body that is slidably in close contact with the inner peripheral cylindrical portion of the cylinder 101 is fixed to the inner peripheral flange portion 113 extending in the inner peripheral direction from the inner peripheral cylindrical portion 112 of the piston member 111. An outer peripheral seal lip 142 made of a rubber-like elastic body that protrudes toward the pressurizing chamber M and slidably contacts the outer peripheral cylindrical portion of the cylinder 101 is provided at the outer peripheral side corner of the flange portion 114 of the piston member 111. It is fixed (see Patent Document 1 below).

この構成だと、圧力作動時に内周シールリップ背面１４１ａに応力が集中し、集中した応力がシールリップ１４１を形成しているゴム状弾性体の物性を越えるとシールリップ１４１が破損してしまう虞があるため、内周シールリップ１４１の背面１４１ａが固着している内周フランジ部１１３の内周側端部１１５にＲ面取り加工部１１５ａを形成し、シールリップ背面１４１ａへの応力集中を緩和することが行われている。   With this configuration, stress is concentrated on the inner peripheral seal lip back surface 141a during pressure operation, and the seal lip 141 may be damaged if the concentrated stress exceeds the physical properties of the rubber-like elastic body forming the seal lip 141. Therefore, an R chamfered portion 115a is formed on the inner peripheral side end portion 115 of the inner peripheral flange portion 113 to which the rear surface 141a of the inner peripheral seal lip 141 is fixed, and stress concentration on the seal lip rear surface 141a is alleviated. Things have been done.

しかしながら、内周フランジ部１１３の内周側端部１１５に形成されているＲ面取り加工部１１５ａをプレス成形にて行う場合、プレス加工機への負荷が大きくなるため、ピストン部材１１１の成形と同時に行うことができるようにプレス加工機の出力を補強する、若しくはピストン部材１１１をプレス成形するのとは別工程でＲ面取り加工部１１５ａをプレス加工すること等の対策が必要となる。またＲ面取り加工部１１５ａをプレス成形によらない場合には、切削加工する等の対策が必要となり、いずれの場合においても製造コストが増加するとの不具合が存在した。   However, when the R chamfered portion 115a formed on the inner peripheral side end portion 115 of the inner peripheral flange portion 113 is performed by press molding, the load on the press machine increases, so that the piston member 111 is simultaneously formed. It is necessary to take measures such as reinforcing the output of the press machine so that it can be performed or pressing the R chamfered portion 115a in a separate process from the press molding of the piston member 111. Further, when the R chamfered portion 115a is not based on press molding, measures such as cutting are necessary, and in any case, there is a problem that the manufacturing cost increases.

特開平０９−２１００８８号公報Japanese Patent Laid-Open No. 09-210088

本発明は、上記問題点を解決するためになされたものであって、その目的とするところは、圧力作動時にシールリップ背面に応力が集中しないようにシールリップを固着することができ、しかも製造コストが抑制されたピストン部材を備えたＢＰＳを提供することである。   The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to fix the seal lip so that stress is not concentrated on the back surface of the seal lip during pressure operation, and to manufacture the seal lip. It is providing BPS provided with the piston member by which cost was suppressed.

上記目的を達成するため、本発明の請求項１に係る自動変速機用ピストンシールは、有底円筒形状のシリンダ内部を軸方向に変位し前記シリンダとで加圧室を画成するピストン部材を備えた自動変速機用ピストンシールにおいて、前記加圧室側に突出し前記シリンダ内周面を摺動自在に密接する内周シールリップが固着している前記ピストン部材の内周側端部にテーパ状面取り部を形成したことを特徴とするものである。   In order to achieve the above object, a piston seal for an automatic transmission according to claim 1 of the present invention includes a piston member that axially displaces the inside of a bottomed cylindrical cylinder and defines a pressure chamber with the cylinder. In the piston seal for an automatic transmission provided, the inner peripheral end of the piston member has a tapered shape and is fixed to an inner peripheral seal lip that protrudes toward the pressurizing chamber and slidably contacts the inner peripheral surface of the cylinder. A chamfered portion is formed.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、上記構成を備えた本発明の請求項１のＢＰＳは、内周シールリップが固着するピストン部材の内周側端部にテーパ状面取り部が形成されているので、当該テーパ状面取り部に固着する内周シールリップの背面部のゴム体積を増加させることができる。よって、圧力作動時に内周シールリップ背面に応力が集中せず内周シールリップの破損を防止することができ、内周シールリップの耐久性・耐圧性を向上することができる。   That is, in the BPS according to the first aspect of the present invention having the above-described configuration, the tapered chamfered portion is formed at the inner peripheral side end of the piston member to which the inner peripheral seal lip is fixed. The rubber volume of the back surface portion of the inner peripheral seal lip to be fixed can be increased. Therefore, stress is not concentrated on the back surface of the inner peripheral seal lip during pressure operation, so that the inner peripheral seal lip can be prevented from being damaged, and the durability and pressure resistance of the inner peripheral seal lip can be improved.

また、ピストン部材の内周側端部にテーパ状面取り加工を施すのでプレス機の負荷が小さく、ピストン部材の成形時に同時にプレス加工にてテーパ状面取り加工を施すことができ、したがって、プレス機の改造、若しくは別工程にて切削する対策が不要となり、製造コストをＲ面取り加工のときより抑制することができる。   Further, since the taper chamfering process is performed on the inner peripheral end of the piston member, the load on the press machine is small, and the taper chamfering process can be performed by pressing simultaneously with the molding of the piston member. There is no need to modify or cut in a separate process, and the manufacturing cost can be reduced compared to the R chamfering process.

本発明に係るＢＰＳの概略断面図Schematic sectional view of BPS according to the present invention 図１における内周シールリップの固着状態を示す拡大図The enlarged view which shows the adhering state of the inner peripheral seal lip in FIG. 従来例に係るＢＰＳの部分断面図Partial sectional view of BPS according to conventional example 図３における内周シールリップの固着状態を示す拡大図The enlarged view which shows the adhering state of the inner peripheral seal lip in FIG.

以下に図面を参照して、この発明の好適な実施の形態を例示して説明する。   Preferred embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明に係るＢＰＳを軸心Ｏを通る平面で切断して示す概略断面図であり、図２は、図１における内周シールリップ部がピストン部材に固着された状態を示す拡大図である。   1 is a schematic cross-sectional view showing a BPS according to the present invention cut along a plane passing through an axis O, and FIG. 2 is an enlarged view showing a state in which an inner peripheral seal lip portion in FIG. 1 is fixed to a piston member. FIG.

これらの図に示す通り、ＢＰＳ１は略コ字形状を呈する有底円筒形状のシリンダ１０内部に配設され、シリンダ１０とで加圧室Ｍを画成している。このＢＰＳ１を挟んで加圧室Ｍと軸方向反対側にはキャンセルプレート３０が配設されていて、ＢＰＳ１及びキャンセルプレート３０とで均衡油室Ｎを形成している。また、ＢＰＳ１の外周側であって加圧室Ｍと軸方向反対側には多板クラッチ６０が配設されており、均衡油室Ｎ内には、加圧室Ｍが加圧されることにより多板クラッチ６０を押圧するＢＰＳ１を押し戻すように機能するリターンスプリング３１が配設されている。   As shown in these figures, the BPS 1 is disposed inside a bottomed cylindrical cylinder 10 having a substantially U-shape, and a pressurizing chamber M is defined by the cylinder 10. A cancel plate 30 is disposed on the opposite side of the pressurizing chamber M in the axial direction across the BPS 1, and the balanced oil chamber N is formed by the BPS 1 and the cancel plate 30. Further, a multi-plate clutch 60 is disposed on the outer peripheral side of the BPS 1 and on the opposite side of the pressurizing chamber M in the axial direction, and the pressurizing chamber M is pressurized in the balanced oil chamber N. A return spring 31 that functions to push back the BPS 1 that presses the multi-plate clutch 60 is provided.

ＢＰＳ１は、ピストン部材２０と、内周シールリップ４１と、外周シールリップ４６とを備えていて、加圧室Ｍの作用圧力の保持を主機能としている。ピストン部材２０は、鋼板等の金属板を打ち抜きプレスで成形したものであって、フランジ部２１の内外周端部からキャンセルプレート３０側（図における下側）に延びる内周筒部２２と外周筒部２６を有している。内周シールリップ４１は、ゴム状弾性体により成形されており、ピストン部材２０の内周筒部２２から内周方向に延びる内周フランジ部２３の内周側端部２４に加圧室Ｍ側（図における上側）へ向けて突出した形状で固着しており、シリンダ１０の内周筒部と摺動自在に密接するようになっている。外周シールリップ４６は、ゴム状弾性体により成形されており、ピストン部材２０のフランジ部２１の外周側角部に加圧室Ｍ側へ向けて突出した形状で固着しており、シリンダ１０の外周筒部と摺動自在に密接するようになっている。また、内周シールリップ４１と外周シールリップ４６とは、内周筒部２２及びフランジ部２１を被覆している膜部４７により連結され、一体成形されている。   The BPS 1 includes a piston member 20, an inner peripheral seal lip 41, and an outer peripheral seal lip 46, and has a main function of maintaining the working pressure in the pressurizing chamber M. The piston member 20 is formed by stamping a metal plate such as a steel plate, and has an inner peripheral cylindrical portion 22 and an outer peripheral cylinder extending from the inner and outer peripheral end portions of the flange portion 21 to the cancel plate 30 side (lower side in the drawing). A portion 26 is provided. The inner peripheral seal lip 41 is formed of a rubber-like elastic body, and is connected to the inner peripheral side end portion 24 of the inner peripheral flange portion 23 extending in the inner peripheral direction from the inner peripheral cylindrical portion 22 of the piston member 20 on the pressure chamber M side. It sticks in the shape which protruded toward the (upper side in a figure), and comes in close contact with the inner peripheral cylinder part of the cylinder 10 so that sliding is possible. The outer peripheral seal lip 46 is formed of a rubber-like elastic body, and is fixed to the outer peripheral side corner of the flange portion 21 of the piston member 20 in a shape protruding toward the pressurizing chamber M side. It is designed to be slidably in close contact with the cylindrical portion. Further, the inner peripheral seal lip 41 and the outer peripheral seal lip 46 are connected by a film portion 47 covering the inner peripheral cylindrical portion 22 and the flange portion 21, and are integrally formed.

更に、ピストン部材２０の内周フランジ部２３であって、内周シールリップ４１のリップ先端部４２の背面部４３が固着する部位である内周側端部２４の加圧室側角部２５には、ピストン部材２０を成形するときに同時にプレス成形されたテーパ状面取り部５０が形成されている。   Furthermore, the inner peripheral flange portion 23 of the piston member 20, which is formed on the pressurizing chamber side corner portion 25 of the inner peripheral end portion 24, which is a portion to which the back portion 43 of the lip tip portion 42 of the inner peripheral seal lip 41 is fixed. Is formed with a tapered chamfered portion 50 that is press-molded at the same time as the piston member 20 is molded.

このテーパ状面取り部５０の両端部５１は、Ｒ加工されており、このＲの大きさとしては０．１ｍｍ以上であれば好適であり、より好適であるには０．３ｍｍ以上あることが望ましい。   Both end portions 51 of the tapered chamfered portion 50 are R-processed, and the size of R is preferably 0.1 mm or more, and more preferably 0.3 mm or more. .

このように構成されたＢＰＳ１は、内周シールリップが固着している内周フランジ部２３の内周側端部２４にテーパ状面取り部５０が形成されているので、テーパ状面取り部５０に固着する内周シールリップ４１の背面部４３のゴム体積が、Ｒ面取り加工部が形成されているときより増加し応力集中が緩和されるので、内周シールリップ４１の耐圧性を向上することが可能となる。   The BPS 1 configured in this manner is fixed to the tapered chamfered portion 50 because the tapered chamfered portion 50 is formed at the inner peripheral side end portion 24 of the inner peripheral flange portion 23 to which the inner peripheral seal lip is fixed. Since the rubber volume of the back surface portion 43 of the inner peripheral seal lip 41 increases more than when the R chamfered portion is formed and the stress concentration is reduced, the pressure resistance of the inner peripheral seal lip 41 can be improved. It becomes.

また、テーパ状面取り部５０をプレス成形するときのプレス加工機への負荷が小さいので、ピストン部材２０のプレス成形と同時に内周側端部２４の加圧室側角部２５にテーパ状面取り加工を行うことが可能となり、したがってプレス機の改造や、別工程での切削工程が不要であるのでピストン部材２０の加工が容易となり、ＢＰＳ１の製造コストを抑制することが可能となる。   Further, since the load on the press machine when the taper chamfered portion 50 is press-molded is small, the taper-shaped chamfering is performed at the pressurizing chamber side corner 25 of the inner peripheral side end 24 simultaneously with the press molding of the piston member 20. Therefore, since it is not necessary to modify the press machine or to perform a cutting process in a separate process, the piston member 20 can be easily processed, and the manufacturing cost of the BPS 1 can be suppressed.

１ 自動変速機用ピストンシール（ＢＰＳ）
１０ シリンダ
２０ ピストン部材
２１，２３ フランジ部
２２，２６ 筒部
２４ 内周側端部
２５ 角部
３０ キャンセルプレート
３１ リターンスプリング
４１，４６ シールリップ
４２ リップ先端部
４３ 背面部
４７ 膜部
５０ テーパ状面取り部
５１ 端部
６０ 多板クラッチ
Ｍ 加圧室
Ｎ 均衡油室 1 Piston seal (BPS) for automatic transmission
DESCRIPTION OF SYMBOLS 10 Cylinder 20 Piston member 21,23 Flange part 22,26 Cylinder part 24 Inner peripheral side end part 25 Corner part 30 Cancel plate 31 Return spring 41,46 Seal lip 42 Lip tip part 43 Back part 47 Film part 50 Tapered chamfer part 51 End 60 Multi-plate clutch M Pressure chamber N Balance oil chamber

Claims (1)

有底円筒形状のシリンダ内部を軸方向に変位し前記シリンダとで加圧室を画成するピストン部材を備えた自動変速機用ピストンシールにおいて、
前記加圧室側に突出し前記シリンダ内周面を摺動自在に密接する内周シールリップが固着している前記ピストン部材の内周側端部にテーパ状面取り部を形成したことを特徴とする自動変速機用ピストンシール。 In a piston seal for an automatic transmission provided with a piston member that axially displaces the inside of a bottomed cylindrical cylinder and defines a pressurizing chamber with the cylinder,
A taper chamfered portion is formed at the inner peripheral side end of the piston member to which an inner peripheral seal lip that protrudes toward the pressurizing chamber and slidably contacts the inner peripheral surface of the cylinder is fixed. Piston seal for automatic transmission.
JP2009037986A 2009-02-20 2009-02-20 Piston seal for automatic transmission Pending JP2010190391A (en)

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JP2009037986A JP2010190391A (en) 2009-02-20 2009-02-20 Piston seal for automatic transmission

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JP2010190391A true JP2010190391A (en) 2010-09-02

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012166586A (en) * 2011-02-10 2012-09-06 Nissin Kogyo Co Ltd Vehicle hydraulic master cylinder, and method of forming seal groove therein
KR20180056479A (en) * 2016-11-18 2018-05-29 한국에스케이에프씰 주식회사 Piston for Active Transfer Case
JP2018115689A (en) * 2017-01-17 2018-07-26 Nok株式会社 Sealing device
CN114514391A (en) * 2019-10-25 2022-05-17 Nok株式会社 Sealing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62181757U (en) * 1986-05-12 1987-11-18
JP2007225046A (en) * 2006-02-24 2007-09-06 Nok Corp Seal integrated piston

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62181757U (en) * 1986-05-12 1987-11-18
JP2007225046A (en) * 2006-02-24 2007-09-06 Nok Corp Seal integrated piston

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012166586A (en) * 2011-02-10 2012-09-06 Nissin Kogyo Co Ltd Vehicle hydraulic master cylinder, and method of forming seal groove therein
KR20180056479A (en) * 2016-11-18 2018-05-29 한국에스케이에프씰 주식회사 Piston for Active Transfer Case
KR101882995B1 (en) * 2016-11-18 2018-07-31 한국에스케이에프씰 주식회사 Piston for Active Transfer Case
JP2018115689A (en) * 2017-01-17 2018-07-26 Nok株式会社 Sealing device
JP7349232B2 (en) 2017-01-17 2023-09-22 Nok株式会社 sealing device
CN114514391A (en) * 2019-10-25 2022-05-17 Nok株式会社 Sealing device

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