JP2832819B2 - Piston for automatic transmission - Google Patents
Piston for automatic transmissionInfo
- Publication number
- JP2832819B2 JP2832819B2 JP8160875A JP16087596A JP2832819B2 JP 2832819 B2 JP2832819 B2 JP 2832819B2 JP 8160875 A JP8160875 A JP 8160875A JP 16087596 A JP16087596 A JP 16087596A JP 2832819 B2 JP2832819 B2 JP 2832819B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- seal
- mold
- piston body
- automatic transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Description
【0001】[0001]
【発明の属する技術分野】この発明は自動変速機用ピス
トンに関する。The present invention relates to a piston for an automatic transmission.
【0002】[0002]
【従来の技術】自動車等に使用されている自動変速機に
は、油圧作動のクラッチ装置が内蔵され、このクラッチ
装置に於て、環状のピストンが円筒状空間内に配設さ
れ、このピストンは油圧及びバネ等にて往復作動する。2. Description of the Related Art Automatic transmissions used in automobiles and the like have a built-in hydraulically operated clutch device. In this clutch device, an annular piston is disposed in a cylindrical space. Reciprocating operation by hydraulic pressure and spring.
【0003】ケーシング内面と接触するシール部材を、
このピストンは備えるが、従来、特開昭57−200729号等
に記載のピストンでは、シール部材を、金属製ピストン
本体に固着するため、取付・保持用の金属製部品を別に
必要とした。[0003] A seal member which comes into contact with the inner surface of the casing,
Although this piston is provided, conventionally, in the piston described in JP-A-57-200729 and the like, a metal part for mounting and holding is separately required in order to fix the seal member to the metal piston body.
【0004】従来の上述のような構造のピストンでは、
シール部材取付・保持用の金属製部品を要する分だけ、
部品点数が増え、構造が複雑化し、内部漏洩を生ずる場
合もある。そこで、実公平1− 34744号に記載されたよ
うに、板金製のピストン本体の内外周縁に、断面コ字状
の嵌合溝を備えたシール部材を、嵌合した状態で、加熱
溶着により(固着)一体化する技術が、提案された。In a conventional piston having the above-described structure,
Only the metal parts for mounting and holding the seal member are required,
The number of parts increases, the structure becomes complicated, and internal leakage may occur. Thus, as described in Japanese Utility Model Publication No. 1-37444, a sealing member having a fitting groove having a U-shaped cross section is fitted to the inner and outer peripheral edges of a sheet metal piston body by heat welding in a fitted state. Sticking) integration techniques have been proposed.
【0005】[0005]
【発明が解決しようとする課題】ところが、図7と図8
と図9に示すように、実際の製造に於て、板金製ピスト
ン本体31の周縁32が2点鎖線の如く変形し、さらに、シ
ール部33の一部にバリ(はみ出し部)34が発生する場合
があり、バリ除去作業を必要とし、生産能率が低下す
る。また、自動車用自動変速機のクラッチとして、実用
上問題がある。However, FIGS. 7 and 8
As shown in FIG. 9 and FIG. 9, in the actual production, the peripheral edge 32 of the sheet metal piston main body 31 is deformed as shown by a two-dot chain line, and further, a burr (protruding portion) 34 is generated in a part of the seal portion 33. In some cases, a deburring operation is required, and production efficiency is reduced. Further, there is a practical problem as a clutch of an automatic transmission for a vehicle.
【0006】発明者等はこのような問題が生ずる原因を
多大の試行錯誤のうえ、見付け出した。即ち、ピストン
30は、板金製ピストン本体31の大半部位はシール部33に
て被覆されずに露出する形状・構造のため、成形の際、
ピストン本体31を上型35と下型36で挟み込む必要があ
る。その際、ピストン本体31の厚さ寸法Tの公差(ばら
つき)を考慮して、上型35に突起状シール止め部37を設
けて、上型35と下型36を相互に接近(押圧)した時のシ
ール部33のゴムの流れを止める金型形状とする。[0006] The inventors have found the cause of such a problem after extensive trial and error. That is, the piston
30 is a shape and a structure in which most parts of the sheet metal piston body 31 are exposed without being covered with the seal portion 33,
It is necessary to sandwich the piston body 31 between the upper mold 35 and the lower mold 36. At this time, in consideration of the tolerance (variation) of the thickness dimension T of the piston main body 31, a protrusion-shaped seal stopper 37 is provided on the upper mold 35, and the upper mold 35 and the lower mold 36 are brought close to each other (pressed). The mold is configured to stop the flow of the rubber in the seal portion 33 at the time.
【0007】ところが、厚さ寸法Tが上限値に近い場
合、上記突起状シール止め部37が図7の矢印Fの如く、
ピストン本体31内へ押し込まれ(喰い込み)、2点鎖線
のように反り返り状に(塑性)変形し、下型36の(突起
の無い)シール止め部38と、ピストン本体31の下面との
間に、間隙39を生じ、この間隙39へゴムが流入して、図
8と図9に示す如く、シール部33の一部にバリ(はみ出
し部)34を発生する。However, when the thickness dimension T is close to the upper limit value, the above-mentioned projection-shaped seal stopper 37 is moved as shown by an arrow F in FIG.
It is pushed into the piston main body 31 (bites in) and deforms in a warped shape (plastic) as indicated by a two-dot chain line, between the seal stop portion 38 (without protrusion) of the lower mold 36 and the lower surface of the piston main body 31. Then, a gap 39 is formed, and the rubber flows into the gap 39 to generate a burr (protruding portion) 34 on a part of the seal portion 33 as shown in FIGS.
【0008】言い換えると、ピストン本体31の周縁32に
溶着被覆されたシール部33の断面コ字状の付着部におけ
る表裏両脚長の内、突起状シール止め部37(上型35)に
対応する側の脚長をLP とし、反対(下型36)側の脚長
をLS としたとき、LP >L S となっていたため、上型
35の突起状シール止め部(押え部)37の押し込み(喰い
込み)によって、ピストン本体31が2点鎖線に示すよう
に反り返り変形を生じ、間隙39を発生して、これに流れ
込んだゴムがバリ34となっていた。In other words, on the peripheral edge 32 of the piston body 31
At the adhesion part of the U-shaped cross section of the welded seal part 33
Of the length of the front and back legs, the protrusion-shaped seal stopper 37 (upper die 35)
The corresponding leg length is LPAnd the leg length on the opposite (lower die 36) side
To LSAnd LP> L SBecause it was
Pressing (eating) the protrusion-shaped seal stopper (presser) of 37
As a result, the piston body 31
Warping deformation occurs, and a gap 39 is generated.
The rubber in it was a burr 34.
【0009】本発明は、このようなバリの発生が無く、
金型による成型の後のバリ除去の仕上げ処理を省略し、
生産能率の改善を図り、コスト低減と品質の安定と向上
を図ることを、目的とする。According to the present invention, such burrs are not generated,
Omitting the finishing process of removing burrs after molding with a mold,
The aim is to improve production efficiency, reduce costs and stabilize and improve quality.
【0010】[0010]
【課題を解決するための手段】上記目的を達成するた
め、本発明に係る自動変速機用ピストンは、突起状シー
ル止め部を、上型と下型の一方にのみ有する金型にて、
金属製ピストン本体の周縁にリップ付きシール部を加熱
溶着した自動変速機用ピストンに於て、ピストン本体の
上記周縁の端面と表裏両面にわたって溶着被覆された上
記シール部の断面コ字状の付着部における表裏両脚長の
内、上記突起状シール止め部に対応する側の脚長をLP
とし、反対側の脚長をLS としたとき、 LP ≦LS となるように設定される。In order to achieve the above object, a piston for an automatic transmission according to the present invention comprises a mold having a projection-shaped seal stopper only in one of an upper mold and a lower mold.
In a piston for an automatic transmission in which a seal portion with a lip is heated and welded to a peripheral edge of a metal piston body, a U-shaped cross-section of the seal portion is welded and coated on both the end surface and the front and back surfaces of the peripheral edge of the piston body. of the front and back legs length in the leg length of the side corresponding to the projecting seal retaining portion L P
And, when the leg length of the side opposite to the L S, is set to be L P ≦ L S.
【0011】また、金型の突起状シール止め部の先端断
面の丸味の半径をRとしたとき、 0≦(LS − LP )≦R に設定される。Further, when the radius of the rounded tip section of the projecting seal retaining portion of the mold was set to R, 0 ≦ - it is set to (L S L P) ≦ R .
【0012】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づき詳説する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【0013】図1は本発明に係る自動変速機用ピストン
1を例示し、自動車等に使用される自動変速機の内部に
於て、油圧作動のピストンとして用いられる。即ち、こ
の自動変速機の内部には、油圧にて作動するクラッチ装
置が設けられるが、そのクラッチピストンやキャンセル
ピストンとして用いられる。FIG. 1 illustrates an automatic transmission piston 1 according to the present invention, which is used as a hydraulically operated piston in an automatic transmission used in an automobile or the like. That is, a clutch device operated by hydraulic pressure is provided inside the automatic transmission, and is used as a clutch piston or a cancel piston.
【0014】図1では、中央に比較的大き目の孔2が貫
設された板金等の円環板状の金属製ピストン本体3と、
その本体3の外周縁6に加熱溶着したゴム又はプラスチ
ックのシール部4とから、構成されている。In FIG. 1, an annular plate-shaped metal piston body 3 such as a sheet metal having a relatively large hole 2 penetrated in the center is provided.
It comprises a rubber or plastic seal portion 4 which is heat-welded to an outer peripheral edge 6 of the main body 3.
【0015】板状ピストン本体3は、図1では浅皿形で
あり、また、シール部4はリップ部5を有し、このリッ
プ部5は(図示省略の)クラッチドラム等のケーシング
内面に摺接して、密封作用をなす。さらに、シール部4
は、(図2の要部拡大図で明らかな如く、)ピストン本
体3の外周縁6の端面(周囲面)7と表裏両面8,9に
わたって溶着被覆された断面コ字状の付着部10を備えて
おり、この断面コ字状付着部10の一角部から傾斜状に前
記リップ部5が延設された断面形状である。The plate-shaped piston body 3 has a shallow dish shape in FIG. 1, and the seal portion 4 has a lip portion 5 which slides on an inner surface of a casing such as a clutch drum (not shown). In contact with, it acts as a seal. Furthermore, the sealing part 4
(See FIG. 2) is an attachment portion 10 having a U-shaped cross section which is welded and coated over the end surface (peripheral surface) 7 of the outer peripheral edge 6 of the piston body 3 and the front and back surfaces 8, 9. The lip 5 has a cross-sectional shape in which the lip 5 extends obliquely from one corner of the U-shaped attachment portion 10.
【0016】さらに詳しく言えば、シール部4の断面コ
字状の付着部10は、ピストン本体3の外周縁6の端面7
・表て面8・裏面9に夫々対応した周面被覆部10a・表
て面被覆部10b・裏面被覆部10cから、成る。そして、
リップ部5の突出した側───作動油圧の受圧部側──
─を本発明では、表て面8・表て面被覆部10bと呼ぶこ
ととする。More specifically, the attachment portion 10 having a U-shaped cross section of the seal portion 4 is attached to the end face 7 of the outer peripheral edge 6 of the piston body 3.
A peripheral surface covering portion 10a corresponding to the front surface 8 and the rear surface 9; a front surface covering portion 10b; and a rear surface covering portion 10c. And
Side of lip 5 protruding {pressure receiving side of hydraulic pressure}
In the present invention, ─ is referred to as the surface 8 and the surface covering portion 10b.
【0017】ところで、本発明のピストンは、図3と図
4に例示するような金型にて、シール部4が金属製ピス
トン本体3の外周縁6に加熱溶着される。即ち、突起状
シール止め部(押え部)11は、(図3と図4では)上型
12にのみ突出形成され、下型13には非突起状の段付部14
をもって、シール止め部15を形成した金型が用いられ
る。In the piston of the present invention, the seal portion 4 is heated and welded to the outer peripheral edge 6 of the metal piston body 3 by using a mold as illustrated in FIGS. That is, the protruding seal stopper (holding part) 11 is (in FIGS. 3 and 4) an upper mold.
The lower mold 13 has a non-projecting stepped portion 14
A mold having the seal stopper 15 is used.
【0018】そして、突起状シール止め部11はその先端
断面が図3と図6に示すような丸味を有し、その丸味の
半径をRとすると、通常このRの値は、 0.1mm〜 0.5mm
である。さらに、図1〜図4及び図5で明らかなよう
に、断面コ字状の付着部10における表裏両脚長の内、突
起状シール止め部11に対応する側の(断面の)脚長をL
P とし、反対側(平坦シール止め部15に対応する側)の
脚長をLS としたとき、LP ≦LS となるように設定す
る。なお、図4に示したように一方の脚長LP は、端面
7から突起状シール止め部11の中央線までの寸法とす
る。The protruding seal stopper 11 has a rounded tip section as shown in FIGS. 3 and 6, and if the radius of the roundness is R, the value of R is usually 0.1 mm to 0.5 mm. mm
It is. Further, as is apparent from FIGS. 1 to 4 and 5, of the length of the front and back legs of the attachment portion 10 having a U-shaped cross section, the length of the leg (of the cross section) corresponding to the projection-shaped seal stopper 11 is represented by L.
Is P, when the leg length of the opposite side (the side corresponding to the flat seal retaining portion 15) was set to L S, is set to be L P ≦ L S. In addition, as shown in FIG. 4, one leg length L P is a dimension from the end face 7 to the center line of the protruding seal stopper 11.
【0019】好ましいのは、図5に示すように、0≦
(LS −LP )≦Rとなるように、比較的両脚長差を小
さく設定することである。Preferably, as shown in FIG.
(L S -L P) such that ≦ R, is to set small relatively both leg length differences.
【0020】図3と図4に於て、上型12の突起状シール
止め部(押え部)11が、下型13の段付部14───平坦シ
ール止め部15───よりも、先端側(端面7側)にある
ため、上型12から受ける押え力Fにより、端面7側が下
型13側へ変形する曲げモーメントを受け、下型13の平坦
シール止め部15に間隙を生じない(密着状態を保つ)こ
ととなって、シール部4のゴム等の流れを確実に止め
る。In FIGS. 3 and 4, the protruding seal stopper (holding portion) 11 of the upper die 12 is smaller than the stepped portion 14 of the lower die 13 {the flat seal stopper 15}. Since it is on the front end side (end surface 7 side), the pressing force F received from the upper die 12 receives a bending moment to deform the end surface 7 side to the lower die 13 side, so that no gap is generated in the flat seal stopper 15 of the lower die 13. Thus, the flow of the rubber or the like in the seal portion 4 is reliably stopped.
【0021】なお、図1〜図5の実施の形態に於て、上
型12側に突起状シール止め部11を配設した場合を示した
が、(本発明ではこれに限定されず)下型13側に突起状
シール止め部11を配設しても良く、そのとき、下型13側
に対応して形成される裏面被覆部10cの脚長LP が、表
て面被覆部10bの脚長LS と同等乃至以下となるよう
に、設定する(図示省略)。さらに、シール部4をピス
トン本体3の内周縁に加熱溶着する場合も、上述の両脚
長LP ,LS の関係式は成立する。In the embodiment shown in FIGS. 1 to 5, the case where the projecting seal stopper 11 is provided on the upper mold 12 side is shown. However, the present invention is not limited to this. may be disposed projecting seal retaining portion 11 in the mold 13 side, then the leg length L P of the back surface coating portion 10c which is formed corresponding to the lower die 13 side, leg length table Te surface covering portion 10b It is set to be equal to or less than L S (not shown). Further, also in the case where the seal portion 4 is heat-welded to the inner peripheral edge of the piston body 3, the above-described relational expression of the two leg lengths L P and L S is satisfied.
【0022】なお、上型12と下型13の両者に突起状シー
ル止め部(押え部)11,11を設けることは実用上次のよ
うな問題があり好ましいことではない。即ち、上型12と
下型13に、上記シール部4の付着部10の両脚長に差をも
って配置した場合、ピストン本体3が上(又は下)に大
きく反り返る変形を生じ、好ましくない。また、両脚長
を等しくなるように上下突起状シール止め部11, 11を対
応させて配置した場合、ピストン本体3の両面に喰い込
み、その部分での応力集中による強度低下が懸念され、
好ましくない。It is not preferable to provide the projection-shaped seal stoppers (pressers) 11, 11 on both the upper mold 12 and the lower mold 13 because of the following problems in practical use. That is, if the upper mold 12 and the lower mold 13 are arranged with a difference in both leg lengths of the attachment portion 10 of the seal portion 4, the piston main body 3 is undesirably deformed to largely warp upward (or downward). In addition, when the upper and lower protrusion-shaped seal stoppers 11 and 11 are arranged so as to correspond to both leg lengths, they bite into both surfaces of the piston body 3, and there is a concern that strength may be reduced due to stress concentration at that portion.
Not preferred.
【0023】なお、上述の如く本発明に於ては、LP ≦
LS とする点が大きな特徴である。両脚長の差、つまり
(LS −LP )の値は特に限定しないが、この差の値
(LS−LP )が大きくなり過ぎると、(一般に板金製
の)ピストン本体3の厚さ寸法Tの公差以外に、ピスト
ン本体3自体が有する平面度(反り等)を考慮して、突
起状シール止め部11の高さを増大する必要が生じるた
め、この差の値(LS −LP )を極力小さくするのが望
ましく、前述のように、0≦(LS −LP )≦R程度と
するのが良い。As described above, in the present invention, L P ≦
A major feature is that L S is used. Difference between the leg length, i.e. (L S -L P) but the values are not particularly limited, the value of the difference (L S -L P) is too large, (typically made of sheet metal) thickness of the piston body 3 besides dimensional tolerances T, considering flatness with the piston body 3 itself (the warp), it is not necessary to increase the height of the protruding seal retaining portion 11 occurs, the value of the difference (L S -L it is desirable to minimize the P), as described above, 0 ≦ (L S -L P ) had better be about ≦ R.
【0024】本発明によれば、図3と図4で明らかなよ
うに、上型12を下型13に接近させてゆくと、突起状シー
ル止め部11が、ピストン本体3の上面に強く押圧され
(喰い込む場合も多い)。矢印Fのような外力が作用す
るが、下型13の段付部14と同一乃至先端寄りを、上記外
力Fにて押圧するため、ピストン本体3の先端側が上方
へ反り返ることを防止でき、これにより、(下型13の)
平坦シール止め部15からの浮き上りを防止し、もってシ
ール部4の材料の流入を防ぎ得て、(図9に示したよう
な)バリ(はみ出し)を生じない。従って、高精度の寸
法・形状のシール部4を容易に形成できる。According to the present invention, as is apparent from FIGS. 3 and 4, when the upper mold 12 is moved closer to the lower mold 13, the projection-shaped seal stopper 11 is strongly pressed against the upper surface of the piston body 3. It is (it often bites). Although an external force as shown by an arrow F is applied, the same or a position near the tip as the stepped portion 14 of the lower mold 13 is pressed by the external force F, so that the tip side of the piston body 3 can be prevented from warping upward. By (lower die 13)
Floating from the flat seal stopper 15 can be prevented, thereby preventing the inflow of the material of the seal portion 4 and no burr (as shown in FIG. 9) occurs. Therefore, it is possible to easily form the seal portion 4 having a highly accurate size and shape.
【0025】[0025]
【発明の効果】本発明は上述の構成により次のような著
大な効果を奏する。According to the present invention, the following significant effects can be obtained by the above-described structure.
【0026】 (請求項1又は2によれば、)製造す
るうえでシール部4の一部にバリ(はみ出し部)を発生
することを確実に防止できる。従って、後工程で、バリ
除去作業を要さず、生産能率が向上する。かつ、密封性
能の面からも、常に安定した高品質・高精度のシール部
4が形成しやすい。According to the first or second aspect, it is possible to reliably prevent burrs (protruding portions) from being generated in a part of the seal portion 4 in manufacturing. Therefore, the production efficiency is improved without the need for a burr removal operation in a later step. In addition, from the viewpoint of sealing performance, it is easy to always form a stable, high-quality, high-precision seal portion 4.
【0027】 (請求項2によれば、)製造が一層容
易となる。即ち、ピストン本体3に板金を素材として用
いた場合、全体の平面度(反り等)を考慮して、シール
止め部11の突起高さを増加する必要があるが、両脚長差
(LS −LP )が零乃至極めて小さくしたことにより、
上記平面度(反り等)の影響が減少でき、シール止め部
11の突起高さを比較的低くできる。従って、ピストン本
体3の寸法公差・平面度のバラツキによって、突起状シ
ール止め部11が大きくピストン本体3に押込まれ(喰い
込み)、ピストン本体3が異常に変形して不良品を発生
することも、防止できる。勿論、シール止め部11の使用
による損傷も少なくなり寿命が伸びる利点もある。(According to claim 2), the manufacture is further facilitated. That is, when a sheet metal is used as the material for the piston body 3, it is necessary to increase the height of the projection of the seal stopper 11 in consideration of the overall flatness (warpage or the like), but the difference between the two leg lengths (L S − L P ) is zero or extremely small,
The effect of the flatness (warpage, etc.) can be reduced, and the seal stop
The height of the projections 11 can be made relatively low. Therefore, due to the dimensional tolerance and flatness variation of the piston body 3, the projection-shaped seal stopper 11 is largely pushed into the piston body 3 (biting), and the piston body 3 may be abnormally deformed to generate a defective product. , Can be prevented. Of course, there is an advantage that damage due to the use of the seal stopper 11 is reduced and the life is extended.
【図1】本発明に係る自動変速機用ピストンの実施の一
形態を示す断面図である。FIG. 1 is a sectional view showing an embodiment of a piston for an automatic transmission according to the present invention.
【図2】図1の要部拡大図である。FIG. 2 is an enlarged view of a main part of FIG.
【図3】製造説明のための要部拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a main part for explaining manufacturing.
【図4】寸法関係説明のための要部拡大断面図である。FIG. 4 is an enlarged sectional view of a main part for describing a dimensional relationship.
【図5】本発明の実施の他の形態を示す寸法関係説明用
断面図である。FIG. 5 is a sectional view for explaining a dimensional relationship showing another embodiment of the present invention.
【図6】突起状シール止め部の拡大断面図である。FIG. 6 is an enlarged sectional view of a projection-shaped seal stopper.
【図7】従来の問題点を説明するための製造途中を示す
断面図である。FIG. 7 is a cross-sectional view showing a state in the course of manufacture for explaining a conventional problem.
【図8】従来の問題点を説明するための要部拡大断面図
である。FIG. 8 is an enlarged sectional view of a main part for explaining a conventional problem.
【図9】図8のさらに拡大した断面図である。FIG. 9 is a further enlarged sectional view of FIG. 8;
3 ピストン本体 4 シール部 5 リップ部 6 周縁 7 端面 10 付着部 11 突起状シール止め部(押え部) 12 上型 13 下型 R 半径 LP 脚長 LS 脚長3 Piston body 4 Seal part 5 Lip part 6 Peripheral edge 7 End face 10 Adhesive part 11 Protruding seal stopper (holding part) 12 Upper die 13 Lower die R radius L P leg length L S leg length
Claims (2)
方にのみ有する金型にて、金属製ピストン本体の周縁に
リップ付きシール部を加熱溶着した自動変速機用ピスト
ンに於て、ピストン本体の上記周縁の端面と表裏両面に
わたって溶着被覆された上記シール部の断面コ字状の付
着部における表裏両脚長の内、上記突起状シール止め部
に対応する側の脚長をLP とし、反対側の脚長をLS と
したとき、 LP ≦LS となるように設定されたことを特徴とする自動変速機用
ピストン。1. A piston for an automatic transmission in which a sealing portion with a lip is heat-welded to a peripheral edge of a metal piston body by a mold having a projection-shaped seal stopper portion only in one of an upper mold and a lower mold. of the front and back legs length in a U-shaped attachment portion of the welding coated the sealing portion over the front and rear surfaces and an end surface of the peripheral edge of the piston body, the leg length of the side corresponding to the protruding sealing stopper portion and L P Wherein the length of the opposite leg is L S, and L P ≦ L S.
丸味の半径をRとしたとき、 0≦(LS −LP )≦R に設定した請求項1記載の自動変速機用ピストン。2. The piston for an automatic transmission according to claim 1, wherein 0 ≦ (L S −L P ) ≦ R, where R is the rounded radius of the tip end cross section of the projecting seal stop portion of the mold. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8160875A JP2832819B2 (en) | 1996-05-30 | 1996-05-30 | Piston for automatic transmission |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8160875A JP2832819B2 (en) | 1996-05-30 | 1996-05-30 | Piston for automatic transmission |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09317792A JPH09317792A (en) | 1997-12-09 |
JP2832819B2 true JP2832819B2 (en) | 1998-12-09 |
Family
ID=15724268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8160875A Expired - Lifetime JP2832819B2 (en) | 1996-05-30 | 1996-05-30 | Piston for automatic transmission |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2832819B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4982132B2 (en) * | 2006-08-21 | 2012-07-25 | 光洋シーリングテクノ株式会社 | Sealing device |
JP5218153B2 (en) * | 2009-02-26 | 2013-06-26 | 株式会社日立プラントテクノロジー | Microorganism detection apparatus, detection method, and sample container used therefor |
JP6916670B2 (en) * | 2017-06-01 | 2021-08-11 | Nok株式会社 | Sealing device and its manufacturing method |
-
1996
- 1996-05-30 JP JP8160875A patent/JP2832819B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH09317792A (en) | 1997-12-09 |
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