JPS6023025A - ゴム製部品の装着方法 - Google Patents

ゴム製部品の装着方法

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Publication number
JPS6023025A
JPS6023025A JP58108428A JP10842883A JPS6023025A JP S6023025 A JPS6023025 A JP S6023025A JP 58108428 A JP58108428 A JP 58108428A JP 10842883 A JP10842883 A JP 10842883A JP S6023025 A JPS6023025 A JP S6023025A
Authority
JP
Japan
Prior art keywords
rubber
frozen
fixed
adjuster
stretched
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.)
Pending
Application number
JP58108428A
Other languages
English (en)
Inventor
Koji Nakamura
浩二 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Molten Corp
Original Assignee
Molten Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Molten Corp filed Critical Molten Corp
Priority to JP58108428A priority Critical patent/JPS6023025A/ja
Publication of JPS6023025A publication Critical patent/JPS6023025A/ja
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/38Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
    • B29C63/42Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/68Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114Single butt joints
    • B29C66/1142Single butt to butt joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • B29C66/5229Joining tubular articles involving the use of a socket
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/03After-treatments in the joint area
    • B29C66/034Thermal after-treatments
    • B29C66/0342Cooling, e.g. transporting through welding and cooling zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311Thermal properties
    • B29C66/73117Tg, i.e. glass transition temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00Use of unspecified rubbers as moulding material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、自動車・、各種機械、装置等に部品として装
着されるゴム製部品の装着方法に関する。
従来技術 第1図及び第2図を用いて−ゴム製部品の従来例装着方
法を説明する。図示の例は、シリンダの接合部分に使用
されるゴム製ダストブーツ(1)であり、シリンダ(2
)とアジャスタ(3)の接合部分(4)を被覆し、外部
からの水分或いは塵埃の侵入を阻止するものである。こ
のダストブーツ(1)の内径は、約30m、アジャスタ
(3)はこれより径大(約501)であり、ダストブー
ツ(1)は、伸長して50寵以上の径大とされた状態で
、アジャスタ(3)を通して接合部分(4)に装着され
る。具体的には装着工程の作業性を向上させるため、ダ
ストブーツ(1ンは装着前にまず第2図(イ)に示す如
く、約100°C雰囲気で約2時間加熱される。(5)
は、ヒータである。この加熱状態にあるダストブーツ(
1)は、伸長治具(6)(6)により数回約240%伸
長される。このような前処理を経た後ダストブーツ(1
)は、作業者の手作業によりアジャスタ(3)を通して
、接合部分(4)に装着される。このとき、ダストブー
ツ(1)はアジャスタ(3)を通すべく角度伸長される
このように従来例方法にあっては、ダストブーッ(1)
は再三にわたり高温度下或いは常温の下で伸長されるた
め永久伸びが生じ、従って締付力が低下し、接合部分を
外界から遮断しこれを保護するという機能は不完全なも
のとなる。第5図及び第6図に曲線Bで示す特性は、従
来例に係る永久変形を示すものである。
発明の目的 本発明は、ゴム製部品の被装着装置への装着完了時、こ
のゴム製部品に永久変形が殆んど残らない新規な装着方
法の提供をその目的とする。
発明の構成 本発明は、ゴム製部品を被装着装置への装着が容易な大
きさ或いは形状に伸長した状態で、該ゴム製部品を構成
するゴムポリマーのガラス転移温度以下に冷却して凍結
し該当凍結状態にあるゴム製部品を被装着装置に装着し
、然る後上記ゴム製部品を常温に戻して弾性状態に復帰
させることにより装着位置への弾性締付けを行なうもの
である。
実 施 例 第3図において、約30額の内径をもつダストブーツ(
1)は、まず図(イ)に示す如く、常温下においてアジ
ャスタ(3)の外径より若干大きい径をもつ円筒形治具
(7)に伸長してかけられ、ダストブーツ(1)を構成
するゴム材料のガラス転移温度以下に冷却される。この
冷却によりダストブーツ(L)は、凍結状態となり、円
筒形治具(7)からとり外してもその伸長状態は保持さ
れる。それ故この凍結状態にあるダストブーツ(1)を
、図(ロ)に示す如くアジャスタ(3)を通してシリン
ダ(2)との接合部分(4)に位置させ、常温下におい
て自然加温させるか或いは強制的に加熱して元の弾性状
態に復帰させれば、ダストブーツ(1)は、永久変形を
生じることなく元の径に略完全に復帰し、充分な締付力
が得られる。ダストブーツ(1)の冷却温度を、このダ
ストブーツ(1)を構成するゴムポリマーのガラス転移
温度としたのは、ガラス転移温度以下では分子運動が凍
結されガラス状態になるため被装着装置への装着が容易
となり、かつ、再び常温に戻したとき元の形状、大きさ
に略完全に復帰させるごとができるためである。
以下に具体的実験例を用いて本発明実施例を従来例と比
較しつつ説明する。
実験例 l エチレンプロピレンゴム(EP’r)(硬度60)(住
友化学株式会社製、ニスブレン502(商品名))にて
直径25鶴の0リングを使用して実験を行なった。この
E P Tのガラス転移温度は約−40°Cである。こ
のOリングを直径5Qu+の円筒治具にかけて(伸長率
100%)−−40゜C雰囲気中で10分間冷却した後
、70°Cで10分間加温した。この加温処理10分を
経過した時点、その後1時間ごとに0リングの径を測定
したところ、次表の結果Aを得た。
表1 尚、表1における測定結果Bは、従来例を示し、常温下
で100%伸長した後、10分経過後から実施例同様0
リングの径を測定したものである。
第4図は、これらの測定結果をグラフに示したもので、
縦軸にブーツ元通(xO)と時間tにおけるブーツ径(
Xt)の差△X (−Xt−Xo)を横軸に時間tを示
す。従来例では、曲線Bに示す如く伸長解除後3時間経
過した後も、約0.6++nの変形が残っており、これ
は、光径(25,1mm)に対し、2%強の割合となっ
ている。これに対し実施例では、曲線Aに示す如く加温
処理後1時間で完全に元の形状に復帰している。
実験例2 試験材料として天然ゴム(NR)(硬度66)を使用し
、実験例1と同様約25in径の0リングを作成し、1
00%伸長して、前記実験と同一の実験を行なった。
尚、NRのガラス転移温度は、約−70°Cである。次
表Aは本例に係る測定結果、Bは、常温下で行なった前
述と同様の従来例測定結果である。
表2 一70° Cメタノール中(ドライアイス冷却)第5図
は、これらの測定結果をグラフに示すもので、実施例で
は、曲線へに示す如く、加温処理後約1時間で略安定な
状態に復帰し、その変形は、約0.2mmである。これ
は、元通(25,2+n)に対し、約0.8%弱と、実
質上無視できる程度となる。これに対し、従来例では、
曲線Bに示す如(、加温処理後、約2時間を経過して漸
く安定状態に達するが、このときの変形は、約1.2鰭
と大きく、これは元通(25,0龍)に対し、4.8%
と相当大きな値となり、実用に際しての悪影響は避けら
れない。
発明の効果 本発明ゴム製部品の装着方法は、予めゴム製91%品を
被装着装置に装着し易い大きさ或いは形状に伸長した状
態で、その構成ゴムポリマーのガラス転移温度以下に冷
却してその分子運動を停止、即ち、凍結させ、この凍結
状態にあるゴム製部品を被装着装置に装着し、その後自
然加温或いは強制加熱して元の状態に復帰させるもので
ある。それ故、従来作業者が、治具を使用し或いは手作
業でゴム製部品を伸長して被装着装置に装着する作業に
比較して、その装着作業が格段に容易かつ労力を要さな
いものとなる。かつまた本発明によれば、ゴム製部品の
装着後これに残る永久変形を、従来例に比して、格段に
減少させることができるから、充分な締付力を維持する
ことができゴム製部品本来の機能が損われることはない
。特に実施例としてあげたダストブーツの如き部品は、
永久変形が生ずると、これから水分、塵埃等の不要物が
ダストブーツ内に侵入し、ダストブーツとして致命的欠
陥を生ずることとなるが、本発明によりかかる欠陥の発
生は阻止し得ることとなる。尚、実施例にあっては、被
装着装置の装着位置に至る前段に、径大部等ゴム製部品
の伸長が要求されるものにつき説明したが、必ずしもか
かる径大部は必要な条件ではなく、僅か伸長するのみで
装着位置への装着が可能な構造の装置にあっても、勿論
本発明は適用でき、この場合には、作業者は装着作業時
ゴム製部品を伸長する必要がなく、作業の簡易化が図れ
るという効果を奏する。
【図面の簡単な説明】
第1図は、被装着装置に−ゴム製部品が装着された状態
を示す斜視図、第2図(イ)(ロ)は、従来例装着方法
を説明するための斜視図、第3図(イ)(ロ)(ハ)は
、本発明実施例を説明するための斜視図、第4図及び第
5図は、従来例及び実施例における変形の時間的変化を
示す曲線図である。 (1)・・・ダストブーツ (2)・・・シリンダ(3
)・・・アジャスタ (4)・・・接合部分(7)・・
・円筒形治具 特許出願人 モルテンゴムL業株式会社 代表者民秋史也 1 (旬 1 ノ (ロ) (ハ) 第3図 第4図 第5図

Claims (1)

    【特許請求の範囲】
  1. 1、被装着装置に装着され装着位置の弾性締付けをなす
    ゴ、!、製部品の装着方法において該ゴム製部品を被装
    着装置への装着が容易な大きさ或いは形状に伸長した状
    態で、上記ゴム製部品を構成するゴム材料のガラス転移
    温度以下に冷却して凍結し、該凍結状態にある上記ゴム
    製部品を上記被装着装置の装着位置に装着し、然る後上
    記ゴム製部品を常温に戻して弾性状態に復帰させること
    により上記装着位置の弾性締付けをなすことを特徴とす
    るゴム製部品の装着方法
JP58108428A 1983-06-15 1983-06-15 ゴム製部品の装着方法 Pending JPS6023025A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58108428A JPS6023025A (ja) 1983-06-15 1983-06-15 ゴム製部品の装着方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58108428A JPS6023025A (ja) 1983-06-15 1983-06-15 ゴム製部品の装着方法

Publications (1)

Publication Number Publication Date
JPS6023025A true JPS6023025A (ja) 1985-02-05

Family

ID=14484518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58108428A Pending JPS6023025A (ja) 1983-06-15 1983-06-15 ゴム製部品の装着方法

Country Status (1)

Country Link
JP (1) JPS6023025A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2620647A1 (fr) * 1987-09-17 1989-03-24 Glaenzer Spicer Sa Procede de mise en place d'une gaine d'etancheite en materiau thermoplastique sur un organe mecanique
US7445096B2 (en) 2004-12-15 2008-11-04 Stabilus Gmbh Piston-cylinder unit and process for producing a piston-cylinder unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2620647A1 (fr) * 1987-09-17 1989-03-24 Glaenzer Spicer Sa Procede de mise en place d'une gaine d'etancheite en materiau thermoplastique sur un organe mecanique
US7445096B2 (en) 2004-12-15 2008-11-04 Stabilus Gmbh Piston-cylinder unit and process for producing a piston-cylinder unit

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