JPS62200045A - Piston for hydraulic shock-absorber - Google Patents
Piston for hydraulic shock-absorberInfo
- Publication number
- JPS62200045A JPS62200045A JP3902686A JP3902686A JPS62200045A JP S62200045 A JPS62200045 A JP S62200045A JP 3902686 A JP3902686 A JP 3902686A JP 3902686 A JP3902686 A JP 3902686A JP S62200045 A JPS62200045 A JP S62200045A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- cylinder
- shock absorber
- piston body
- hydraulic shock
- 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.)
- Granted
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 33
- 230000035939 shock Effects 0.000 claims abstract description 32
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 238000013016 damping Methods 0.000 abstract description 13
- 239000012530 fluid Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は油圧緩衝器用のピストンに関し、更に詳しくは
、オリフィスを存するピストン本体の外周に樹脂を主体
とする外被部材を装着した油圧緩衝器用ピストンの改良
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a piston for a hydraulic shock absorber, and more particularly, to a piston for a hydraulic shock absorber in which an outer cover member mainly made of resin is attached to the outer periphery of a piston body having an orifice. Regarding improvements to pistons.
−Ｃに、乗用車、トラック等のような車輌のサスペンシ
ョンに用いられる筒型のショックアブソーバにおいては
、ピストン・ロッドの一端に固定されたピストンがアウ
タシェルの内側に設けられたシリンダ内に摺動可能に配
置され、ピストンには複数のオリフィスが設けられる。-C. In cylindrical shock absorbers used for suspensions of vehicles such as passenger cars and trucks, a piston fixed to one end of a piston rod is slidable within a cylinder provided inside an outer shell. and the piston is provided with a plurality of orifices.
シリンダに対するピストン・ロッドの軸線方向の振動は
オリフィスを通る作動液の流動抵抗によって減衰される
。ショックアブソーバの性能を向上させるためには減衰
力の安定化を図る必要がある。しかしながら、通常、ピ
ストンとシリンダの内面との間には隙間が存在している
ので、この隙間による作動液の漏れの影響よってショッ
クアブソーバの減衰力の変動を来すこととなる。Axial vibrations of the piston rod relative to the cylinder are damped by the resistance to flow of hydraulic fluid through the orifice. In order to improve the performance of a shock absorber, it is necessary to stabilize the damping force. However, since there is usually a gap between the piston and the inner surface of the cylinder, the damping force of the shock absorber fluctuates due to the leakage of hydraulic fluid due to this gap.
米国特許第３２１２４１１号明細書にはショックアブソ
ーバに用いられるピストンの構造が開示されている。こ
の公知のピストンは、第７図に示すように、オリフィス
２ａを有する金属製のピストン本体２とその外周を覆う
樹脂製の外被部材３とからなっている。ピストン本体２
の外周には複数個の環状溝２ｂが設けられており、外被
部材３の内側には環状溝２ｂに係合する環状の突起３ａ
が設けられている。US Pat. No. 3,212,411 discloses the structure of a piston used in a shock absorber. As shown in FIG. 7, this known piston consists of a metal piston body 2 having an orifice 2a and a resin jacket member 3 covering the outer periphery of the piston body 2. Piston body 2
A plurality of annular grooves 2b are provided on the outer periphery of the sheath member 3, and an annular projection 3a that engages with the annular groove 2b is provided on the inside of the outer covering member 3.
is provided.
この公知のピストンによれば、金属製のとストン本体２
とシリンダの内面との金属接触が防止されるので、シリ
ンダに対するピストンの摺動特性が向上する。しかしな
がら、この公知のピストンにおいても、外被部材３とシ
リンダとの間に隙間が存在し、この隙間は作動時に発生
する熱による樹脂の膨張、収縮或いは外被部材３やシリ
ンダの製造公差によりばらつき、また、摩耗によって増
加するので、外被部材３とシリンダの内面との間の隙間
からの作動液の漏れによる減衰力の変動の問題を解決す
ることはできない。According to this known piston, the metal piston body 2
Since metal contact between the piston and the inner surface of the cylinder is prevented, the sliding characteristics of the piston with respect to the cylinder are improved. However, even in this known piston, there is a gap between the jacket member 3 and the cylinder, and this gap varies due to the expansion and contraction of the resin due to the heat generated during operation, or manufacturing tolerances of the jacket member 3 and the cylinder. Furthermore, since the damping force increases due to wear, it is not possible to solve the problem of fluctuations in the damping force due to leakage of hydraulic fluid from the gap between the jacket member 3 and the inner surface of the cylinder.
上記従来技術の問題点は、本発明によれば、シリンダ内
の液圧を利用してピストンとシリンダの内面との間に安
定したシールを行わせることができるピストンにより解
決される。According to the present invention, the above-mentioned problems of the prior art are solved by a piston that can create a stable seal between the piston and the inner surface of the cylinder by utilizing the hydraulic pressure within the cylinder.
すなわち、本発明は、オリフィスを有するピストン本体
の外周に樹脂を主体とする外被部材を装着した油圧緩衝
器用ピストンにおいて、前記ピストン本体と前記外被部
材との間に、前記ピストン本体の作動時に発生する液圧
を前記外被部材の端部近傍の内面側に導いて前記外被部
材の端部側を拡径させる圧力伝達部を設けたことを特徴
とする油圧緩衝器用ピストンを提供する。That is, the present invention provides a piston for a hydraulic shock absorber in which a jacket member mainly made of resin is attached to the outer periphery of a piston body having an orifice. A piston for a hydraulic shock absorber is provided, characterized in that a pressure transmitting part is provided that guides the generated hydraulic pressure to the inner surface side near the end of the jacket member to expand the diameter of the end part of the jacket member.
本発明による上記手段によれば、ピストン本体の作動時
に発生する液圧が圧力伝達部を通じて外被部材の端部近
傍の内面側に導かれるので、外被部材の端部が液圧によ
って拡径し、シリンダの内面に押し付けられる。したが
って、ピストンの外被部材とシリンダの内面との間は十
分にシールされ、シリンダ内の作動液は実質的にオリフ
ィスのみを流通することとなる。したがって、より安定
した減衰力を得ることができる。According to the above means according to the present invention, the hydraulic pressure generated during operation of the piston body is guided to the inner surface near the end of the jacket member through the pressure transmitting part, so that the end of the jacket member expands in diameter due to the hydraulic pressure. and is pressed against the inner surface of the cylinder. Therefore, the outer sheath member of the piston and the inner surface of the cylinder are sufficiently sealed, and the hydraulic fluid in the cylinder flows substantially only through the orifice. Therefore, more stable damping force can be obtained.
以下、図面を参照して本発明の詳細な説明する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図及び第２図は本発明による油圧緩衝器用ピストン
の一実施例を示すものである。これらの図を参照すると
、油圧緩衝器用ピストン１０は金属製のピストン本体１
１を備えている。ピストン本体１１にはその両端面間に
延びる複数個のオリフィス１２が設けられている。1 and 2 show an embodiment of a piston for a hydraulic shock absorber according to the present invention. Referring to these figures, the hydraulic shock absorber piston 10 has a metal piston body 1.
1. The piston body 11 is provided with a plurality of orifices 12 extending between both end faces thereof.
この時、ピストン本体１１の外周は軸線方向に延びる円
筒部１３と、該円筒部１３両端からピストン本体１１の
両端に向かってそれぞれ延びるテーバ面部１４とを備え
ているようにするとよい。At this time, the outer periphery of the piston body 11 preferably includes a cylindrical portion 13 extending in the axial direction and tapered surface portions 14 extending from both ends of the cylindrical portion 13 toward both ends of the piston body 11.
このテーパ面部１４は円筒部１３からピストン本体１１
のいずれか一端若しくは両端に向かってそれぞれ徐々に
縮径させる構造とする。This tapered surface portion 14 extends from the cylindrical portion 13 to the piston body 11.
It has a structure in which the diameter gradually decreases toward either one end or both ends.
ピストン本体１１の円筒部１３には複数個（ここでは４
つ）の環状溝１５が軸線方向に等間隔隔てて設けられて
いる。The cylindrical portion 13 of the piston body 11 has a plurality of (here, 4)
Two annular grooves 15 are provided at equal intervals in the axial direction.
ピストン本体１１の円筒部１３には樹脂製の筒状外被部
材１６が装着されている。外被部材１６の材質としては
、特に限定はされないが、摺動性の点でポリテトラフル
オルエチレン（ＰＴＦＥ）或いはＰＴＦＥを含む樹脂等
が好ましい。外被部材１６の外周には外被部材１６の両
端に向かって徐々に縮径するテーバ部１７をそれぞれ設
けてもよい。A cylindrical outer cover member 16 made of resin is attached to the cylindrical portion 13 of the piston body 11 . The material of the outer covering member 16 is not particularly limited, but polytetrafluoroethylene (PTFE) or a resin containing PTFE is preferable from the viewpoint of sliding properties. Tapered portions 17 may be provided on the outer periphery of the outer sheathing member 16, the diameter of which gradually decreases toward both ends of the outer sheathing member 16.
外被部材１６の内側にはピストン本体１１の環状溝１５
に係合する環状の突起１８が設けられている。各突起１
８の先端は環状溝１５の幅を直径とするほぼ半円形断面
を有している。The annular groove 15 of the piston body 11 is located inside the jacket member 16.
An annular protrusion 18 is provided which engages with. Each protrusion 1
The tip of 8 has a substantially semicircular cross section with a diameter equal to the width of the annular groove 15.
ピストン本体１１にはピストン本体１１の作動時に発生
する液圧を外被部材１６の端部の内面に導く圧力伝達部
としての圧力溝１９が設けられている。ここでは、ピス
トン本体１１の円筒部１３の両端にそれぞれ４つの圧力
溝１９が開口しており、各４つの圧力溝１９は軸線方向
両端の環状溝１５にそれぞれ連通している。この時、円
筒部１３のいずれか一端に圧力溝１９を開口するように
もできる。The piston body 11 is provided with a pressure groove 19 that serves as a pressure transmitting portion that guides the hydraulic pressure generated during operation of the piston body 11 to the inner surface of the end portion of the jacket member 16. Here, four pressure grooves 19 are opened at both ends of the cylindrical portion 13 of the piston body 11, and each of the four pressure grooves 19 communicates with the annular grooves 15 at both ends in the axial direction. At this time, the pressure groove 19 may be opened at either end of the cylindrical portion 13.
ここでは、ピストン本体１１の４つの環状溝Ｉ５のうち
中央の２つの環状溝１５は突起１８の先端に適合するほ
ぼ半円形断面の底面を有している。一方、第３図（ａ）
に示すように、軸線方向端部の環状溝１５の底面は突起
１８の先端の半円形断面のほぼ半分に適合するほぼ四半
円形断面の部分２０と該部分２０からピストン本体１１
の端部に向かって徐々に縮径するテーバ部２１とを形成
すれば、環状溝１５のテーバ部２１と突起１８の先端と
の間にはほぼ楔状の隙間が形成される。環状溝１５のテ
ーバ部２１は圧力溝１９の傾斜底面を介してピストン本
体１１のテーバ面部１４に滑らかに繋がっている。Here, of the four annular grooves I5 of the piston body 11, the two central annular grooves 15 have a bottom surface with a substantially semicircular cross section that fits the tip of the projection 18. On the other hand, Fig. 3(a)
As shown in FIG. 2, the bottom surface of the annular groove 15 at the axial end is connected to a portion 20 having an approximately quarter-circular cross section that fits approximately half of the semicircular cross section of the tip of the protrusion 18, and from the portion 20 to the piston body 11.
By forming the tapered portion 21 whose diameter gradually decreases toward the end of the annular groove 15 , a substantially wedge-shaped gap is formed between the tapered portion 21 of the annular groove 15 and the tip of the projection 18 . The tapered portion 21 of the annular groove 15 is smoothly connected to the tapered surface portion 14 of the piston body 11 via the inclined bottom surface of the pressure groove 19.
なお、第３図（ｂ）の如く、テーパ面部１４及びテーバ
部２１をそれぞれストレート面１４′及びストレート部
２１′としてもよい。Incidentally, as shown in FIG. 3(b), the tapered surface portion 14 and the tapered portion 21 may be replaced with a straight surface 14' and a straight portion 21', respectively.
第４図は上記構成を有する油圧緩衝器用ピストンｌＯを
車輌用のショックアブソーバに適用した例を示すもので
ある。第４図を参照すると、ショックアブソーバは円筒
状のアウタシェル２２を有しており、アウタシェル２２
の内側にはシリンダ２３が同軸に設けられている。FIG. 4 shows an example in which the hydraulic shock absorber piston IO having the above structure is applied to a shock absorber for a vehicle. Referring to FIG. 4, the shock absorber has a cylindrical outer shell 22.
A cylinder 23 is coaxially provided inside.
ピストン・ロッド２５はシリンダ２３の一端に設けられ
たロッド・ガイド２４を貫通してシリンダ２３の内外に
延びている。ロッド・ガイド２４の内側にはピストン・
ロッド２５を摺動可能に支持するブツシュ２６が設けら
れている。The piston rod 25 passes through a rod guide 24 provided at one end of the cylinder 23 and extends into and out of the cylinder 23. There is a piston inside the rod guide 24.
A bushing 26 is provided which slidably supports the rod 25.
シリンダ２３の内部及びシリンダ２３と７ウタシエル２
２との間にはそれぞれ作動液が収容されている。油圧緩
衝器用ピストン１０はピストン・ロッド２５の内端部に
取り付けられている。シリンダ２３の内部゛はピストン
１０により２つの液室に画成されている。Inside of cylinder 23 and cylinder 23 and 7 outer shell 2
Hydraulic fluid is accommodated between each of them. Hydraulic shock absorber piston 10 is attached to the inner end of piston rod 25. The interior of the cylinder 23 is defined by the piston 10 into two liquid chambers.
上記構成のショックアブソーバにおいて、ピストン・ロ
ッド２５がシリンダ２３に対して軸線方向に振動すると
、ピストン１０のオリフィス１２をシリンダ２３内の作
動液が通過する。オリフィス１２を通過する作動液の流
動抵抗によりピストン・ロッド２５の振動が減衰される
。In the shock absorber configured as described above, when the piston rod 25 vibrates in the axial direction with respect to the cylinder 23, the hydraulic fluid in the cylinder 23 passes through the orifice 12 of the piston 10. Vibration of the piston rod 25 is damped by the flow resistance of the hydraulic fluid through the orifice 12.
第５図はシリンダ２３に対してピストン１０が図中矢印
方向に移動した場合の作用状態を示すものである。ピス
トン１０のピストン本体１１が矢印方向に移動すると、
ピストン１０の前進側のシリンダ２３の内部の液圧が高
まる。この液圧はピストン本体１１の圧力溝１９を介し
て軸線方向端部の環状溝１５に導かれて外被部材１６の
一方の端部側の内面に作用する。この液圧の作用で外被
部材１６の一方の端部側が半径方向外方に弾性変形し、
シリンダ２３の内面に押し付けられる。したがって、ピ
ストンｌＯシリンダ２３の内面との間は十分にシールさ
れることとなる。FIG. 5 shows the operating state when the piston 10 moves relative to the cylinder 23 in the direction of the arrow in the figure. When the piston body 11 of the piston 10 moves in the direction of the arrow,
The hydraulic pressure inside the cylinder 23 on the forward side of the piston 10 increases. This hydraulic pressure is guided to the annular groove 15 at the axial end via the pressure groove 19 of the piston body 11 and acts on the inner surface of the outer covering member 16 on one end side. Due to the action of this hydraulic pressure, one end side of the outer cover member 16 is elastically deformed radially outward,
It is pressed against the inner surface of the cylinder 23. Therefore, the piston and the inner surface of the cylinder 23 are sufficiently sealed.
この時、圧力伝達部をピストン本体１１の円筒部の両端
に設けた場合、ピストン１０が第５図の矢印と反対の方
向に移動するときは外被部材１６の他方の端部側が同様
に拡径してシリンダ２３の内面に押し付けられる。した
がって、シリンダ２３の内面とピストン１０との間は十
分にシールされることとなる。At this time, if the pressure transmitting parts are provided at both ends of the cylindrical part of the piston body 11, when the piston 10 moves in the direction opposite to the arrow in FIG. radially and pressed against the inner surface of the cylinder 23. Therefore, the inner surface of the cylinder 23 and the piston 10 are sufficiently sealed.
したがって、ショックアブソーバの減衰力特性はシリン
ダ２３の内面とピストン】０との間の隙間の影響を受け
ることは実質的に軽減若しくはなくなり、安定した減衰
力が得られることとなる。Therefore, the influence of the gap between the inner surface of the cylinder 23 and the piston 0 on the damping force characteristics of the shock absorber is substantially reduced or eliminated, and a stable damping force can be obtained.
外被部材１６の摩耗によりシリンダ２３の内面と外被部
材Ｉ６の外周面との間の隙間が増加した場合であっても
外被部材１６の弾性変形によるシール作用が得られるの
で、長期にわたり安定した減衰力特性を保つことができ
る。Even if the gap between the inner surface of the cylinder 23 and the outer circumferential surface of the outer sheath member I6 increases due to wear of the outer sheath member 16, a sealing effect can be obtained due to the elastic deformation of the outer sheath member 16, so the sealing effect is stable over a long period of time. The damping force characteristics can be maintained.
第６図ｆａｔは本発明の他の実施例を示すものである。FIG. 6 fat shows another embodiment of the present invention.
この実施例では、油圧緩衝器用ピストンが圧力伝達部と
しての圧力連通孔１９１を備えている。In this embodiment, the hydraulic shock absorber piston is provided with a pressure communication hole 191 as a pressure transmission section.
圧力連通孔１９１はその一端が外被部材１６の端部の内
面に導かれている。この場合、圧力連通孔は環状溝１５
の底部に導くのが良い。One end of the pressure communication hole 191 is led to the inner surface of the end of the outer cover member 16. In this case, the pressure communication hole is the annular groove 15.
It is better to lead to the bottom of the
第６図（ｂ）は本発明の更に別の実施例を示すものであ
る。この実施例では、圧力伝達部としての圧力導入溝１
９２がピストン本体１１に備えられている。この実施例
においては、圧力導入溝１９２は環状溝１５の外側に環
状に設けられ、外被部材１６の端部の内面１６１はこの
圧力導入溝１９２の上に臨む構造となっている。なお、
自動車用の油圧緩衝器では、ピストン・ロッド２５方向
へピストンが移動するときの減衰力の安定がより要求さ
れるため、圧力伝達部を片側に設ける場合は、この実施
例の如く、ピストン・ロッド２５側に設けるのが良い。FIG. 6(b) shows yet another embodiment of the present invention. In this embodiment, a pressure introduction groove 1 as a pressure transmission section is used.
92 is provided in the piston body 11. In this embodiment, a pressure introducing groove 192 is provided in an annular shape on the outside of the annular groove 15, and the inner surface 161 of the end portion of the jacket member 16 faces above the pressure introducing groove 192. In addition,
Hydraulic shock absorbers for automobiles require more stability in the damping force when the piston moves in the direction of the piston rod 25, so when the pressure transmission section is provided on one side, as in this example, the piston rod It is best to install it on the 25 side.
また、自動車等の複雑な振動（例えばピストンの横方向
の振動を含む）を受ける部位に使用される油圧緩衝器で
は外被部材１６の圧力伝達部を設けた側の端部が半径方
向外方に弾性変形し得る位置に設けなければならない。In addition, in a hydraulic shock absorber used in a part of an automobile that receives complex vibrations (including lateral vibrations of a piston, for example), the end of the outer cover member 16 on the side where the pressure transmission part is provided is radially outward. It must be installed in a position where it can be elastically deformed.
以上一実施例につき説明したが、本発明は上記実施例の
態様のみに限定されるものではなく、特許請求の範囲に
記載した発明の範囲内においてその構成要素に種々の変
形を加えることができる。Although one embodiment has been described above, the present invention is not limited to the embodiment described above, and various modifications can be made to the constituent elements within the scope of the invention described in the claims. .
例えば、外被部材の内面に液圧を導（ための圧力溝は外
被部材の内面に形成してもよい。For example, pressure grooves for introducing hydraulic pressure into the inner surface of the outer covering member may be formed on the inner surface of the outer covering member.
以上の説明から明らかなように、本発明によれば、ピス
トンの作動時に発生する液圧を利用してピストンとシリ
ンダとの間の隙間をシールすることができる油圧緩衝器
用ピストンを提供できるので、本発明による油圧緩衝器
用ピストンを油圧緩衝器に適用すれば安定した減衰力を
得ることができることとなる。As is clear from the above description, according to the present invention, it is possible to provide a piston for a hydraulic shock absorber that can seal the gap between the piston and the cylinder using the hydraulic pressure generated when the piston is operated. If the piston for a hydraulic shock absorber according to the present invention is applied to a hydraulic shock absorber, a stable damping force can be obtained.
第１図は本発明の一実施例を示す油圧緩衝器用ピストン
の一部断面側面図、
第２図は第１図に示すピストンの端面図、第３図＋８）
は第１図に示すピストンの要部拡大断面図、
第３図（ｂ）はピストンの変形例を示す第３図（ａ）と
類似の断面図、
第４図は第１図に示すピストンを車輌用のショックアブ
ソーバに適用した例を示す一部破断断面図、
第５図は第４図に示すピストンの作用を示す部分断面要
部拡大図、
第６図（ａ）及び第６図（ｂ）はそれぞれ本発明の別の
実施例を示す要部断面図、
第７図は従来の油圧緩衝器用ピストンの構造を示す一部
断面側面図である。
ＩＯ・・・ピストン、 １１・・・ピストン本体、１
２・・・オリフィス、１５・・・環状ン簿、１６・・・
外被部材、 １８・・・突起、１９・・・圧力溝、
１９１・・・圧力連通孔、１９２・・・圧力導入溝。Fig. 1 is a partially sectional side view of a piston for a hydraulic shock absorber showing an embodiment of the present invention, Fig. 2 is an end view of the piston shown in Fig. 1, and Fig. 3 +8)
3(b) is a sectional view similar to FIG. 3(a) showing a modification of the piston, and FIG. 4 shows the piston shown in FIG. 1. FIG. 5 is a partially cutaway cross-sectional view showing an example of application to a shock absorber for a vehicle; FIG. 5 is an enlarged partial cross-sectional view of essential parts showing the action of the piston shown in FIG. ) is a sectional view of a main part showing another embodiment of the present invention, and FIG. 7 is a partially sectional side view showing the structure of a conventional piston for a hydraulic shock absorber. IO... Piston, 11... Piston body, 1
2... Orifice, 15... Annular register, 16...
Outer cover member, 18...Protrusion, 19...Pressure groove,
191...Pressure communication hole, 192...Pressure introduction groove.
Claims (1)
体とする外被部材を装着した油圧緩衝器用ピストンにお
いて、前記ピストン本体と前記外被部材との間に、前記
ピストン本体の作動時に発生する液圧を前記外被部材の
端部近傍の内面に導いて前記外被部材の端部側を拡径さ
せる圧力伝達部を設けたことを特徴とする油圧緩衝器用
ピストン。 ２、前記ピストン本体の外周には複数個の環状溝が互い
に間隔を隔てて設けられており、前記外被部材の内面に
は前記環状溝に係合する環状の突起が設けられており、
前記圧力伝達部は前記ピストン本体の端部近傍の環状溝
に連通していることを特徴とする特許請求の範囲第１項
に記載の油圧緩衝器用ピストン。 ３、前記圧力伝達部に連通する前記環状溝と該環状溝に
係合する環状の突起との間には断面楔状の環状の隙間が
形成されていることを特徴とする特許請求の範囲第２項
に記載の油圧緩衝器用ピストン。 ４、前記圧力伝達部がピストン本体に設けられた溝であ
ることを特徴とする特許請求の範囲第１項から第３項ま
でのいずれか１項に記載の油圧緩衝器用ピストン。[Scope of Claims] 1. In a piston for a hydraulic shock absorber, in which a jacket member mainly made of resin is attached to the outer periphery of a piston body having an orifice, a portion of the piston body is provided between the piston body and the jacket member. A piston for a hydraulic shock absorber, characterized in that a pressure transmitting part is provided to guide hydraulic pressure generated during operation to an inner surface near an end of the jacket member to expand the diameter of the end of the jacket member. 2. A plurality of annular grooves are provided at intervals on the outer periphery of the piston body, and an annular protrusion that engages with the annular groove is provided on the inner surface of the jacket member,
The piston for a hydraulic shock absorber according to claim 1, wherein the pressure transmitting portion communicates with an annular groove near an end of the piston body. 3. Claim 2, characterized in that an annular gap having a wedge-shaped cross section is formed between the annular groove that communicates with the pressure transmitting portion and the annular protrusion that engages with the annular groove. A piston for a hydraulic shock absorber as described in . 4. The piston for a hydraulic shock absorber according to any one of claims 1 to 3, wherein the pressure transmitting portion is a groove provided in the piston body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61039026A JPH0637912B2 (en) | 1986-02-26 | 1986-02-26 | Piston for hydraulic shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61039026A JPH0637912B2 (en) | 1986-02-26 | 1986-02-26 | Piston for hydraulic shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62200045A true JPS62200045A (en) | 1987-09-03 |
| JPH0637912B2 JPH0637912B2 (en) | 1994-05-18 |
Family
ID=12541595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61039026A Expired - Lifetime JPH0637912B2 (en) | 1986-02-26 | 1986-02-26 | Piston for hydraulic shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0637912B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0267135U (en) * | 1988-11-10 | 1990-05-21 | ||
| WO2000034682A1 (en) * | 1998-12-04 | 2000-06-15 | W.S. Shamban Europa A/S | A piston or plunger and a method for making the same |
| JP2020067110A (en) * | 2018-10-23 | 2020-04-30 | 日立オートモティブシステムズ株式会社 | Buffer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5457790B2 (en) * | 2009-10-27 | 2014-04-02 | カヤバ工業株式会社 | Cylindrical connection structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57186646A (en) * | 1981-05-11 | 1982-11-17 | Showa Mfg Co Ltd | Piston for hydraulic damper |
-
1986
- 1986-02-26 JP JP61039026A patent/JPH0637912B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57186646A (en) * | 1981-05-11 | 1982-11-17 | Showa Mfg Co Ltd | Piston for hydraulic damper |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0267135U (en) * | 1988-11-10 | 1990-05-21 | ||
| WO2000034682A1 (en) * | 1998-12-04 | 2000-06-15 | W.S. Shamban Europa A/S | A piston or plunger and a method for making the same |
| US6327963B1 (en) | 1998-12-04 | 2001-12-11 | W.S. Shamban Europa A/S | Piston or plunger and a method for making the same |
| JP2020067110A (en) * | 2018-10-23 | 2020-04-30 | 日立オートモティブシステムズ株式会社 | Buffer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0637912B2 (en) | 1994-05-18 |
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