JPH0526050B2

JPH0526050B2 -

Info

Publication number: JPH0526050B2
Application number: JP56170423A
Authority: JP
Inventors: Teruo Kobayashi
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 1981-10-23
Filing date: 1981-10-23
Publication date: 1993-04-14
Also published as: JPS5872742A

Description

[Detailed description of the invention] [Industrial application field]

この出願の発明は、シール機構等の組付の容易
な自動二輪車等に使う油圧緩衝器に関する。 The invention of this application relates to a hydraulic shock absorber for use in motorcycles and the like that has a seal mechanism and the like that can be easily assembled.

[Conventional technology]

従来の油圧緩衝器は、そのシリンダのピストン
を挿入する側の開口内にシール機構が嵌装され
て、前記開口が液密に密封されている。このシー
ル機構は、ロツドの案内および支持体、シール部
材、シール部材の止め板等の複数の小物の部品で
構成されている。複数の小物の部品からなるシール機構をシリン
ダに組付ける方法には、(イ)シール機構の複数の部
品をピストンロツドに嵌め、このシール機構をシ
リンダの開口内に嵌装し、シリンダの内周面に形
成した一つの円周溝に抜止部材を嵌めて、前記シ
ール機構をシリンダに固定するもの（たとえば、
実公昭51−10305号公報）があり、また、(ロ)ロツ
ドの案内および支持体の油室側および反油室側に
筒部を形成し、油室側の筒部内にオイルシール、
止め板およびストツプラバーを嵌めてから筒部の
周縁をかしめ、かつ反油室側の筒部にダストシー
ルおよび止め板を嵌めて、シール機構を組立て、
この組立てたシール機構を、シリンダの開口内に
嵌装して、シリンダの周面の部分およびその端縁
部をかしめて、シリンダに固定するもの（たとえ
ば、実開昭53−106589号公報）等がある。 In a conventional hydraulic shock absorber, a sealing mechanism is fitted into an opening of the cylinder on the side into which the piston is inserted, so that the opening is liquid-tightly sealed. This sealing mechanism is composed of a plurality of small parts, such as a guide and support for the rod, a sealing member, and a stop plate for the sealing member. A method for assembling a seal mechanism consisting of multiple small parts into a cylinder is as follows: (a) Fit the multiple parts of the seal mechanism onto the piston rod, fit this seal mechanism into the opening of the cylinder, and then attach the seal mechanism to the inner peripheral surface of the cylinder. The sealing mechanism is fixed to the cylinder by fitting a retaining member into one circumferential groove formed in the cylinder (for example,
Utility Model Publication No. 51-10305), and (b) cylindrical portions are formed on the oil chamber side and opposite oil chamber side of the rod guide and support body, and an oil seal and an oil seal are formed in the cylindrical portion on the oil chamber side.
After fitting the stop plate and stop rubber, caulk the periphery of the cylindrical part, fit the dust seal and stop plate to the cylindrical part on the side opposite to the oil chamber, and assemble the seal mechanism.
This assembled sealing mechanism is fitted into the opening of the cylinder and fixed to the cylinder by caulking the circumferential surface of the cylinder and its edges (for example, Utility Model Application Publication No. 106589/1989), etc. There is.

[Problem to be solved by the invention]

油圧緩衝器の組立はライン化してコンベア上の
流れ作業により行われるようになつている。複数の小物の部品を、ロツドに嵌めて、シリン
ダの開口内に嵌装し、シリンダの円周溝に抜止部
材を嵌めて、シール機構をシリンダ内に取付ける
前記(イ)の方法では、小物の部品を順次正確な位置
に嵌装するのに時間がかかり、作業能率の低下の
原因となる。また、支持体の筒部内にオイルシー
ル、止め板、ストラツプラバーを嵌めて筒部の周
縁をかしめてシール機構を組立てる前記(ロ)の方法
は、柔らかいストツパラバーを含む部品をかしめ
止めするので、複数の小物の部品を正確な位置関
係で組立てることが難しく、シール機構の組立の
自動化を困難なものにしている。さらに、組立て
たシール機構をシリンダの開口部に嵌装して、シ
リンダの周囲の部分および端縁部をかしめ止めし
て、シール機構をシリンダに組付ける前記(ロ)の方
法では、油圧緩衝器を組立をコンベア上の流れ作
業で行うことが難しくなる。この発明の解決しようとする課題は、前記(イ)お
よび(ロ)の方法のような欠点を有しない油圧緩衝器
を提供すること、換言すると、シール機構の組立
が容易に自動化でき、シール機構等のシリンダへ
の組付作業が容易で、シール機構に無理な力が作
用しない油圧緩衝器を提供することにある。 Hydraulic shock absorbers are now assembled on a line and carried out on a conveyor. In method (a) above, in which a plurality of small parts are fitted into a rod, fitted into the opening of a cylinder, a retaining member is fitted into a circumferential groove of the cylinder, and a sealing mechanism is installed inside the cylinder. It takes time to sequentially fit the parts into the correct positions, which causes a decrease in work efficiency. In addition, in the method (b) above, in which the seal mechanism is assembled by fitting an oil seal, a stop plate, and a strut rubber into the cylindrical portion of the support and caulking the circumference of the cylindrical portion, multiple parts including the soft strut rubber are caulked. It is difficult to assemble small parts in accurate positional relationships, making it difficult to automate the assembly of seal mechanisms. Furthermore, in the method (b) above, in which the assembled seal mechanism is fitted into the opening of the cylinder, the peripheral portion and end edge of the cylinder are caulked, and the seal mechanism is assembled to the cylinder, the hydraulic shock absorber This makes it difficult to assemble on a conveyor assembly line. The problem to be solved by this invention is to provide a hydraulic shock absorber that does not have the disadvantages of the methods (a) and (b) above, in other words, the assembly of the seal mechanism can be easily automated, and the seal mechanism It is an object of the present invention to provide a hydraulic shock absorber which is easy to assemble into a cylinder such as the like, and which does not apply excessive force to a seal mechanism.

[Means to solve the problem]

この発明は前記課題を解決する手段として、次
の構成を採用するものである。この発明の構成は、一方の端を閉塞し他方の端
を開口としたシリンダ内に、該開口側から先端に
ピストンを取付けたロツドが挿入され、開口の近
傍のシリンダの内周面とロツドの外周面の間にシ
ール機構が嵌装されて、他方の端が密封されてい
る油圧緩衝器において、金属製の第１支持体およ
び金属製の第２支持体にロツド挿通用の中心孔を
形成し、第１支持体に凹部を形成し、前記凹部内
に環状のシール部材を嵌め、シール部材を嵌めた
凹部側の第１支持体に第２支持体を当てて、第１
支持体と第２支持体とを同軸的に一体に結合して
シール機構を構成し、先端にピストンを取付けた
ロツドのピストンの近傍の位置に受け部材が取付
けられ、前記ロツドにリバウンド規制用のコイル
スプリングが嵌められ、かつシール機構の前記中
心孔がロツドに嵌められて、コイルスプリングの
一方の端が前記受け部材に係合しその他方の端が
前記シール機構に係合し得るようにされ、ピスト
ン、コイルスプリング、シール機構等を嵌めたロ
ツドがシリンダ内に挿入されてあり、シリンダの
開口の近傍のシリンダに形成した溝孔に抜止部材
が嵌められ、シール機構が着脱自在にシリンダ内
に取付けられ、ロツドにゆるく嵌めたケースキヤ
ツプがシリンダの開口の端面に取外し可能に取付
けられ、ロツドの他方の端に近い部分にバウンド
規制用のストツパが取付けられていることを特徴
とする油圧緩衝器にある。 The present invention employs the following configuration as a means for solving the above problems. The structure of the present invention is such that a rod with a piston attached to the tip is inserted from the opening side into a cylinder with one end closed and the other end open, and the rod is connected to the inner circumferential surface of the cylinder near the opening. In a hydraulic shock absorber in which a sealing mechanism is fitted between the outer peripheral surfaces and the other end is sealed, a central hole for rod insertion is formed in a first metal support and a second metal support. A recess is formed in the first support, an annular sealing member is fitted into the recess, a second support is applied to the first support on the side of the recess into which the sealing member is fitted, and the first
The support body and the second support body are coaxially coupled together to form a sealing mechanism, and a receiving member is attached to a position near the piston of a rod having a piston attached to the tip, and a rebound regulating member is attached to the rod. A coil spring is fitted and the central hole of the sealing mechanism is fitted with a rod such that one end of the coil spring can engage the receiving member and the other end can engage the sealing mechanism. A rod fitted with a piston, a coil spring, a seal mechanism, etc. is inserted into the cylinder, and a retaining member is fitted into a slot formed in the cylinder near the opening of the cylinder, and the seal mechanism is detachably inserted into the cylinder. A hydraulic shock absorber characterized in that a case cap that is loosely fitted to the rod is removably attached to the end face of the opening of the cylinder, and a stopper for preventing bouncing is attached to a portion near the other end of the rod. It is in.

【Example】

この発明の油圧緩衝器の一実施例が第１図およ
び第２図に示されている。この油圧緩衝器は自動
二輪車等の緩衝装置に使用するものである。シリンダ１０ａは、両端が開口しているシリン
ダケース１１の一方（第１図および第２図の左
側）の端の開口端にベースバルブ２０を備えたケ
ースエンド１２が固定され、シリンダ１０ａ内に
一方の端にピストン４０が取付けたロツト３０が
摺動可能に挿入され、かつシリンダ１０ａの他方
の（第１図および第２図の右側）の端に近い開口
内に前記ロツト３０に嵌めたシール機構５０が嵌
合され、シリンダ１０ａの両端が液密に密封され
るようになつている。ケースキヤツプ１３のロツト挿通孔をシリンダ
１０ａの他方の端から突出するロツト３０に嵌
め、ケースキヤツプ１３の一部の突出部をシリン
ダ１０ａの前記開口内に弱い力で取外し可能に圧
入して嵌めて、シリンダ１０ａに取付ける。また、副シリンダ１０ｂは、両端が開口するシ
リンダケース１４と、この一端に気密に取付けた
第１副ケースキヤツプ１５と、この他端に溶接し
て固着した第２副ケースキヤツプ１６とからなつ
ている。この副シリンダ１０ｂは、前記ケースエ
ンド１２の通孔と第２副ケースキヤツプ１６の連
通孔１６ａとに接続した連結ホース１０ｃを介し
て、シリンダ１０ａに連通している。シリンダ１０ａ内のピストン４０とシール機構
５０との間に第１作動油室R₁、ベースバルブ２
０とピストン４０との間に第２作動油室R₂、ベ
ースバルブ２０とケースエンド１２の開口の底部
との間に第３作動油室R₃がそれぞれ形成され、
副シリンダ１０ｂ内のフリーピストン６０と第２
副ケースキヤツプ１６との間に第４作動油室R₄、
フリーピストン６０と第１副ケースキヤツプ１５
との間にガス室Ｇがそれぞれ形成され、それに窒
素ガスが封入されている。ケースエンド１２の開口端は、シリンダケース
１１の内径よりわずかに小さく形成されていて、
第１図に示すように、シリンダケース１１の一方
の端の開口内に嵌合され、溶接によりシリンダケ
ース１１の前記開口の端縁に固着されている。ロツド３０は、第１図および第２図に示すよう
に、両端の外周にねじ部を形成した中空のロツド
本体３１で構成され、ロツド本体３１の通孔３１
ａの近傍に止め部材を取付け、止め部材にロツド
本体３１に嵌めた受け部材３５の凹部を係合さ
せ、受け部材３５を油圧緩衝器の伸長の極限にお
けるピストン４０とシール機構５０との衝突を防
止しかつ緩衝するためのリバウンド規制用のコイ
ルスプリング３６をロツド本体３１の外周に嵌
め、このコイルスプリング３６の一方の端を受け
部材３５にて係止しその他方の端を後記シール機
構５０にて係止し得るようになつている。そして、ロツド本体３１の一方の端にピストン
４０を取付け、ロツド本体３１の外周にリバウン
ド規制用のコイルスプリング３６を嵌め、また、
このロツド３０に他方の側からシール機構５０を
嵌めて板組立てしたものを、シリンダ１０ａの他
方の端の開口からシリンダ１０ａ内に挿入する。
このことにより、シール機構５０がシリンダ１０
ａの他方の端の開口内に嵌装され、ロツド３０の
他方の側の部分がシリンダ１０ａから突出する。この突出するロツド本体３１の他方の側の部分
に、ケースキヤツプ１３を嵌め、油圧緩衝器の収
縮の極限におけるケースキヤツプ３８と後記リテ
ーナ３８等との衝突を防止しかつ緩衝するための
バウンド規制用のストツパ部材３７を内側に向け
て取付ける。なお、シリンダ１０ａの一方の端か
ら少し離れた部分の外周にリテーナ１７が止め部
材にて取付けられている。端部に緩衝機枢支用の軸孔のある筒体の外周に
にアジヤステイングナツト３４を回動可能に取付
け、筒体内にニードル３２の基部を挿入し、その
基部とアジヤステイングナツト３４とを適宜の手
段で連結し、筒体の外周にリテーナ３８を螺合さ
せて取付ける。シリンダ１０ａの外周部に大径のコイルスプリ
ング１０ｄを嵌め、かつロツド本体３１の中空部
内にニードル３２を挿通しながら、前記筒体の内
周部のねじ部をロツド本体３１の他方の端のねじ
部に螺合して固定する。すると、一方の端をリテ
ーナ１７に係合させたコイルスプリング１０ｄの
他方の端がリテーナ３８にて係止される。同時
に、ニードル３２がロツド本体３１の中空部内に
液密にかつ摺動可能に嵌挿され、その先端部がロ
ツド本体３１の一方の端に近い中空部内に圧入し
た筒体３３の開口に臨むようになる。アジヤステ
イングナツト３４を回すことにより、ニードル３
２が進退して、ニードル３２の先端の円錐面と筒
体３３の開口とにより形成されたオリフイスの開
度が調節できるようにする。ピストン４０は、第２図に示すように、ピスト
ンベース４１と、バルブプレート４２と、シート
ワツシヤ４３を主要構成部材とし、ロツド本体３
１の一方の端の部分上にシートワツシヤ４３、サ
ポートプレート４４を介してバルブプレート４２
およびピストンベース４１を嵌合させ、この状態
にてロツド本体３１の一方の端のねじ部にロツク
ナツト４５をねじ込んで固定される。ピストンベース４１は複数の通孔４１ａを備
え、その外周の環状溝にシールリングを介してピ
ストンリング４６が嵌合してあり、主シリンダ１
０ａ内に摺動可能に嵌める。また、バルブプレー
ト４２はサポートプレート４４とともにピストン
ベース４１の各通孔４１ａの開口部に位置して、
ピストン４０の摺動時に油圧の作用により撓ん
で、各通孔４１ａにおける作動油の流通を許容す
る。シール機構５０は、ロツド本体３１を挿入する
中心孔を有する金属製の凹部のある第１支持体５
１、リング状のシール部材５２、ロツド本体３１
を挿入する中心孔を有する金属製の板状の第２支
持体５３等を主要構成部材としている。第１支持体５１は、その外周に環状溝が形成さ
れ、この環状溝にＯリング５４が嵌合され、その
外側の端部にダストシール５５が取付リングによ
りかしめ止めされている。また、第１支持体５１
の内側に前記シール部材５２および第２支持体５
３を収容する凹部が形成されている。第２支持体
５３はその内周に環状溝が形成され、この環状溝
にＯリングを介してロツドリング５６が嵌合され
ている。シール部材５２は、第２図に示すよう
に、ロツト本体３１を通す貫通孔のあるゴム製の
リング状体を二つ重ねて構成され、軸方向寸法よ
りも半径方向の寸法が大きくしてある。シール機構５０は、第１支持体５１の凹部内に
シール部材５２を収容してから、シール部材５２
の凹部がある側に第２支持体５３を被せて、前記
凹部の端縁の部分を内側にかしめて、第１支持体
５１、シール部材５２および第２支持体５３をそ
れら中心孔と前記貫通孔とが同一軸線上に位置す
るように一体に結合して構成する。シール部材５２を収容する凹部を第１支持体５
１に形成するようにすると、第１支持体５１の外
周面の軸方向の長さを大にすることができ、この
ことによりシール機構５０はシリンダケース１１
に対し傾斜する恐れがなく確実に取付けることが
でき、Ｏリング５４による外周面のシールも確実
になる。シール機構５０は、第１支持体５１、Ｏリング
５４、ダストシール５５、シール部材５２、第２
支持体５３、ロツドリング５６等の小物部品をサ
ブ組立にて予め一体に組立てて製作しておく。そ
して、一体に組立てたシール機構５０を、前述し
たようにピストン４０、リバウンド規制用のコイ
ルスプリング３６等を取付けたロツド３０に嵌め
て組付ける。そして、ピストン４０、シール機構
５０等をロツド３０に組付けてからシリンダ１０
ａ内に挿入するようにすると、シール機構５０も
同時にシリンダ１０ａ内に挿入することができ、
時間の節約になり、作業能率の向上に役立つ。この発明においては、シール機構５０の主要部
を構成する第１支持体および第２支持体を金属製
にし、容易に組立て得る構成にしたから、シール
機構５０の組立作業を容易に自動化することがで
きる。そのうえ、シール機構の油室側の全表面を
金属で構成することができる。このシール機構５０は、シリンダ１１ａ内に設
けた内周溝に１個の抜止部材５７（サークリツ
プ）を嵌めて抜止めすることができる。シリンダ
１０ａ内には油圧が常に作用しているから、シー
ル機構５０の第２支持体５３の内側面に作用する
油圧によりシール機構５０を抜止部材５７に押付
けるから、シール機構５０を常にシリンダ１０ａ
の他方の端の開口内に保持することができ、シー
ル機構５０によりシリンダ１０ａの一方の端の開
口部が密閉される。かつ、シール機構５０はその
シール部材５２によりロツド本体３１を液密にか
つ摺動可能にする。また、シール機構５０は一つの抜止部材５７を
取外すことにより、シリンダ１０ａの他方の端の
開口部から容易に外すことができる。抜止部材５７をシリンダ１０ａに係止する円周
溝をシリンダ１０ａの内周面に１個設ければよい
から、シリンダ１０ａの強度の低下を防ぐことが
でき、薄肉の筒状体を使つて、シリンダ１０ａを
形成することができる。実施例の油圧緩衝器においては、それに繰返し
作用する力を、シリンダ１０ａ内のヘツドバルブ
２０、ロツド３０のオリフイス、ピストン４０の
通孔４１ａ等を通しての作動油の流動により生ず
る減衰力により緩衝する。また、シリンダケース
１１の外周に取付けたリテーナ１７とロツド部材
３１の他方の端に取付けたリテーナ３８との間に
介装されたコイルスプリング１０ｄで緩衝する。油圧緩衝器の伸長の極限において、ロツド本体
３１の外周に嵌められかつその一方の端が受け部
材３５に係止されているリバウンド規制用のコイ
ルスプリング３６が、シール機構５０の支持体５
３の内側面に当たり、そのコイルスプリング３６
の弾性によつて緩衝的に停止する。コイルスプリ
ング３６が支持体５３の表面に衝突しても、支持
体５３の油室側の全表面が金属で構成されている
ため、支持体５３が損傷を受ける恐れがない。そ
のうえ、コイルスプリング３６をピストン４０の
近傍のロツド本体３１に取付けた受け部材３５で
係止するから、コイルスプリング３６の係止構造
が簡単になる。また、油圧緩衝器の収縮の極限において、ロツ
ド本体３１の他方の側の部分に取付けたバウンド
規制用のストツパ部材３７の内側の緩衝部分が、
シリンダケース１１の他方の端の端面で係止した
ケースキヤツプ１３に衝突して緩衝的に停止す
る。衝撃的な力はすべてケースキヤツプ１３で受
け止めるため、シリンダ１１ａ内に嵌めたシール
機構５０をシリンダ１１ａの一方の端に向け押圧
することがない。したがつて、油圧緩衝器の収縮
の極限において、シール機構５０がシリンダ１１
ａ内に押し込まれることがなく、シール機構５０
に無理な力が作用しない。 An embodiment of the hydraulic shock absorber of this invention is shown in FIGS. 1 and 2. This hydraulic shock absorber is used as a shock absorber for motorcycles and the like. The cylinder 10a has a case end 12 having a base valve 20 fixed to the open end of one end (the left side in FIGS. 1 and 2) of a cylinder case 11 which is open at both ends, and has one end inside the cylinder 10a. A sealing mechanism in which a rod 30 with a piston 40 attached to the end thereof is slidably inserted, and the rod 30 is fitted into an opening near the other (right side in FIGS. 1 and 2) end of the cylinder 10a. 50 are fitted, and both ends of the cylinder 10a are liquid-tightly sealed. The rod insertion hole of the case cap 13 is fitted into the rod 30 protruding from the other end of the cylinder 10a, and a part of the protrusion of the case cap 13 is removably press-fitted into the opening of the cylinder 10a with a weak force. , attached to the cylinder 10a. The sub-cylinder 10b consists of a cylinder case 14 with both ends open, a first sub-case cap 15 airtightly attached to one end of the cylinder case, and a second sub-case cap 16 welded and fixed to the other end of the cylinder case 14. There is. The sub-cylinder 10b communicates with the cylinder 10a via a connecting hose 10c connected to a communication hole in the case end 12 and a communication hole 16a in the second sub-case cap 16. A first hydraulic oil chamber R ₁ is located between the piston 40 in the cylinder 10a and the seal mechanism 50, and the base valve 2
A second hydraulic oil chamber R ₂ is formed between the base valve 20 and the piston 40, and a third hydraulic oil chamber R ₃ is formed between the base valve 20 and the bottom of the opening of the case end 12.
The free piston 60 in the sub-cylinder 10b and the second
A fourth hydraulic oil chamber R ₄ is provided between the sub case cap 16 and the sub case cap 16.
Free piston 60 and first sub case cap 15
A gas chamber G is formed between the two and filled with nitrogen gas. The open end of the case end 12 is formed slightly smaller than the inner diameter of the cylinder case 11.
As shown in FIG. 1, it is fitted into an opening at one end of the cylinder case 11 and fixed to the edge of the opening of the cylinder case 11 by welding. As shown in FIGS. 1 and 2, the rod 30 is composed of a hollow rod body 31 with threaded portions formed on the outer periphery of both ends.
A stop member is attached near a, and the stop member is engaged with the recess of the receiving member 35 fitted in the rod body 31, so that the receiving member 35 prevents the collision between the piston 40 and the seal mechanism 50 at the limit of extension of the hydraulic shock absorber. A rebound regulating coil spring 36 for preventing and buffering is fitted onto the outer periphery of the rod main body 31, one end of this coil spring 36 is locked by a receiving member 35, and the other end is attached to a sealing mechanism 50 described later. It is designed so that it can be locked. Then, a piston 40 is attached to one end of the rod body 31, a coil spring 36 for rebound regulation is fitted to the outer periphery of the rod body 31, and
The sealing mechanism 50 is fitted onto the rod 30 from the other side, and the assembled plate is inserted into the cylinder 10a from the opening at the other end of the cylinder 10a.
This allows the sealing mechanism 50 to
The other end of the rod 30 is fitted into an opening at the other end of the cylinder 10a, and the other side of the rod 30 projects from the cylinder 10a. The case cap 13 is fitted into the other side of the protruding rod body 31, and is used to prevent and cushion the case cap 38 from colliding with the retainer 38, which will be described later, at the limit of contraction of the hydraulic shock absorber. Attach the stopper member 37 facing inward. Note that a retainer 17 is attached to the outer periphery of the cylinder 10a at a portion slightly away from one end using a stopper member. The adjusting nut 34 is rotatably attached to the outer periphery of a cylinder having a shaft hole for supporting the shock absorber at the end, the base of the needle 32 is inserted into the cylinder, and the adjusting nut 34 is connected to the base of the needle 32. They are connected by appropriate means, and the retainer 38 is screwed and attached to the outer periphery of the cylindrical body. A large-diameter coil spring 10d is fitted to the outer circumference of the cylinder 10a, and while inserting the needle 32 into the hollow portion of the rod body 31, the threaded portion of the inner circumference of the cylinder is connected to the screw at the other end of the rod body 31. Screw it into place and fix it. Then, the other end of the coil spring 10d, which has one end engaged with the retainer 17, is locked by the retainer 38. At the same time, the needle 32 is fluid-tightly and slidably fitted into the hollow part of the rod body 31, so that its tip faces the opening of the cylindrical body 33 press-fitted into the hollow part near one end of the rod body 31. become. By turning the adjusting nut 34, the needle 3
2 moves back and forth to adjust the opening degree of the orifice formed by the conical surface at the tip of the needle 32 and the opening of the cylindrical body 33. As shown in FIG. 2, the piston 40 has a piston base 41, a valve plate 42, and a seat washer 43 as main components, and a rod main body 3.
A seat washer 43 is placed on one end of the valve plate 42 via a support plate 44.
Then, the piston base 41 is fitted, and in this state, the lock nut 45 is screwed into the threaded portion at one end of the rod body 31 and fixed. The piston base 41 has a plurality of through holes 41a, and a piston ring 46 is fitted into an annular groove on the outer periphery of the base through a seal ring.
0a so that it can slide. Further, the valve plate 42 is located at the opening of each through hole 41a of the piston base 41 together with the support plate 44,
When the piston 40 slides, it is bent by the action of hydraulic pressure, allowing the flow of hydraulic oil in each through hole 41a. The sealing mechanism 50 includes a first support 5 with a metal recess having a central hole into which the rod body 31 is inserted.
1. Ring-shaped seal member 52, rod main body 31
The main constituent members include a metal plate-shaped second support body 53 having a central hole into which a metal plate is inserted. The first support body 51 has an annular groove formed on its outer periphery, an O-ring 54 is fitted into the annular groove, and a dust seal 55 is caulked to the outer end of the O-ring 54 by a mounting ring. In addition, the first support body 51
The seal member 52 and the second support body 5 are placed inside the
A recess for accommodating 3 is formed. The second support body 53 has an annular groove formed in its inner periphery, and a rod ring 56 is fitted into this annular groove via an O-ring. As shown in FIG. 2, the sealing member 52 is constructed by stacking two rubber ring-shaped bodies each having a through hole through which the rod body 31 passes, and has a radial dimension larger than an axial dimension. . The sealing mechanism 50 accommodates the sealing member 52 in the recess of the first support body 51 and then seals the sealing member 52.
The second support 53 is placed over the side where the recess is located, and the edge portion of the recess is caulked inward to connect the first support 51, the seal member 52, and the second support 53 to the center hole and the through hole. The hole and the hole are integrally connected so that they are located on the same axis. The recess that accommodates the sealing member 52 is connected to the first support 5.
1, the length of the outer peripheral surface of the first support body 51 in the axial direction can be increased.
It can be mounted reliably without fear of tilting, and the sealing of the outer circumferential surface by the O-ring 54 is also ensured. The seal mechanism 50 includes a first support 51, an O-ring 54, a dust seal 55, a seal member 52, and a second
Small parts such as the support body 53 and the rod ring 56 are assembled and manufactured in advance by sub-assembly. Then, the integrally assembled sealing mechanism 50 is fitted and assembled onto the rod 30 to which the piston 40, rebound regulating coil spring 36, etc. are attached as described above. After assembling the piston 40, seal mechanism 50, etc. to the rod 30, the cylinder 10
When inserted into the cylinder 10a, the seal mechanism 50 can also be inserted into the cylinder 10a at the same time.
It saves time and helps improve work efficiency. In this invention, the first support body and the second support body constituting the main parts of the seal mechanism 50 are made of metal and are configured to be easily assembled, so that the assembly work of the seal mechanism 50 can be easily automated. can. Moreover, the entire surface of the seal mechanism on the oil chamber side can be made of metal. This sealing mechanism 50 can be prevented from coming off by fitting a single retaining member 57 (circlip) into an inner circumferential groove provided in the cylinder 11a. Since oil pressure is always acting in the cylinder 10a, the oil pressure acting on the inner surface of the second support body 53 of the seal mechanism 50 presses the seal mechanism 50 against the retaining member 57, so that the seal mechanism 50 is always applied to the cylinder 10a.
The sealing mechanism 50 seals the opening at one end of the cylinder 10a. Further, the sealing mechanism 50 makes the rod body 31 liquid-tight and slidable by its sealing member 52. Further, the seal mechanism 50 can be easily removed from the opening at the other end of the cylinder 10a by removing one of the retaining members 57. Since it is only necessary to provide one circumferential groove on the inner circumferential surface of the cylinder 10a for locking the retaining member 57 to the cylinder 10a, it is possible to prevent the strength of the cylinder 10a from decreasing, and by using a thin-walled cylindrical body, A cylinder 10a can be formed. In the hydraulic shock absorber of the embodiment, the force that repeatedly acts on it is buffered by the damping force generated by the flow of hydraulic oil through the head valve 20 in the cylinder 10a, the orifice of the rod 30, the through hole 41a of the piston 40, etc. Further, a coil spring 10d interposed between a retainer 17 attached to the outer periphery of the cylinder case 11 and a retainer 38 attached to the other end of the rod member 31 provides a buffer. At the limit of extension of the hydraulic shock absorber, the rebound regulating coil spring 36, which is fitted around the outer periphery of the rod body 31 and whose one end is latched to the receiving member 35, releases the support 5 of the sealing mechanism 50.
3 and its coil spring 36
It stops buffering due to the elasticity of the material. Even if the coil spring 36 collides with the surface of the support 53, there is no risk of damage to the support 53 because the entire surface of the support 53 on the oil chamber side is made of metal. Furthermore, since the coil spring 36 is locked by the receiving member 35 attached to the rod body 31 near the piston 40, the structure for locking the coil spring 36 is simplified. In addition, at the limit of contraction of the hydraulic shock absorber, the inner buffer part of the bounce regulating stopper member 37 attached to the other side of the rod main body 31
The end face of the other end of the cylinder case 11 collides with the case cap 13, which is locked, and stops as a buffer. Since all the impact force is received by the case cap 13, the sealing mechanism 50 fitted in the cylinder 11a is not pushed toward one end of the cylinder 11a. Therefore, at the limit of contraction of the hydraulic shock absorber, the sealing mechanism 50 closes to the cylinder 11.
sealing mechanism 50 without being pushed into a
No excessive force is applied to the

[Actions and effects of the invention]

この発明は、特許請求の範囲に記載された構成
を備えることにより次の(イ)ないし(ホ)の作用効果を
奏する。 (イ) 金属製の第１支持体および金属製の第２支持
体にロツド挿通用の中心孔を形成し、第１支持
体に凹部を形成し、前記凹部内に環状のシール
部材を嵌め、シール部材を嵌めた凹部側の第１
支持体に第２支持体を当てて、第１支持体と第
２支持体とを同軸的に一体に結合してシール機
構を構成するから、シール機構の構成が簡単に
なり、その組立作業の自動化が可能になる。 (ロ) 油圧緩衝器の伸長の極限において、リバウン
ド規制用のコイルスプリングが当る側のシール
機構の全表面が金属で構成されるから、リバウ
ンド規制用の緩衝部材に小径のコイルスプリン
グを使つても、シール機構に損傷を与えること
がない。また、ピストンの近傍のロツドの部分
に受け部材を取付けるだけで、リバウンド規制
用のコイルスプリングが係止できるから、コイ
ルスプリングの係止手段の構造が簡単になな
り、その組付作業も容易になる。 (ハ) ロツドにゆるく嵌めたケースキヤツプをシリ
ンダの開口の端面に取付け、ロツドの他方の端
に近い部分にリバウンド規制用のストツパを取
付けたため、油圧緩衝器の収縮の極限におい
て、バウンド規制用のストツパ部材が、ケース
キヤツプに衝突して緩衝的に停止する。衝撃的
な力はすべてケースキヤツプで受け止めるた
め、シリンダ内に嵌めたシール機構をその油室
側に向け押圧することがく、シール機構に無理
な力が作用しない。 (ニ) シリンダの開口の近傍のシリンダに形成した
溝孔に抜止部材を着脱自在に嵌めるだけで、シ
ール機構をシリンダー内から抜け出さないよう
に取付けることができるから、シール機構のシ
リンダへの組付作業が容易になる。 (ホ) この発明によると、シール機構の構造が簡単
になり、その組立作業の自動化が可能になり、
シール機構等のシリンダへの組付作業も容易に
なる。また、油圧緩衝器の伸長および収縮の極
限を、シール機構の金属の表面とリバウド規制
用のコイルスプリングと係合およびケースキヤ
ツプとリバウンド規制用のストツパとの係合と
により規制するから、シール機構に無理な力が
作用せず、堅牢な油圧緩衝器を容易に得ること
がでなる。 The present invention achieves the following effects (a) to (v) by having the configuration described in the claims. (a) forming a central hole for rod insertion in a first metal support and a second metal support, forming a recess in the first support, and fitting an annular seal member into the recess; The first one on the side of the recess into which the sealing member is fitted.
Since the sealing mechanism is constructed by applying the second support to the support and coaxially joining the first support and the second support, the construction of the sealing mechanism is simplified and the assembly work is simplified. Automation becomes possible. (b) Since the entire surface of the seal mechanism on the side that comes into contact with the rebound regulating coil spring at the limit of extension of the hydraulic shock absorber is made of metal, even if a small-diameter coil spring is used as the rebound regulating shock absorber. , without damaging the seal mechanism. In addition, the coil spring for rebound regulation can be locked by simply attaching the receiving member to the rod near the piston, which simplifies the structure of the coil spring locking means and facilitates its assembly. Become. (c) A case cap that is loosely fitted onto the rod is attached to the end face of the cylinder opening, and a rebound restriction stopper is installed near the other end of the rod. The stopper member collides with the case cap and stops as a buffer. Since all the impact force is absorbed by the case cap, the seal mechanism fitted inside the cylinder is not pushed towards the oil chamber side, and no unreasonable force is applied to the seal mechanism. (d) The seal mechanism can be installed to prevent it from slipping out of the cylinder by simply removably fitting the retaining member into the slot formed in the cylinder near the cylinder opening, making it easy to assemble the seal mechanism into the cylinder. Work becomes easier. (E) According to this invention, the structure of the seal mechanism is simplified, and its assembly work can be automated.
It also becomes easier to assemble the seal mechanism and the like to the cylinder. In addition, the limits of expansion and contraction of the hydraulic shock absorber are regulated by the engagement of the metal surface of the seal mechanism with the coil spring for regulating rebound, and the engagement of the case cap with the stopper for regulating rebound. This makes it possible to easily obtain a robust hydraulic shock absorber without applying excessive force to the structure.

[Brief explanation of drawings]

図面は本発明の実施例の油圧緩衝器を示すもの
で、第１図はその断面図、第２図は第１図の矢印
のある一点鎖線の円で囲まれた部分を拡大した
断面図である。図中、１０ａはシリンダ、１１はシリンダーケ
ース、１２はケースエンド、１３はケースキヤツ
プ、３０はロツド、３５は受け部材、３６はリバ
ウンド規制用のコイルスプリング、３７はリバウ
ンド規制用のストツパ、４０はピストン、５０は
シール機構、５１は第１支持体、５２はシール部
材、５３は第２支持体、５７は抜止部材である。 The drawings show a hydraulic shock absorber according to an embodiment of the present invention, and FIG. 1 is a cross-sectional view thereof, and FIG. 2 is an enlarged cross-sectional view of the part surrounded by the dashed-dot circle with the arrow in FIG. be. In the figure, 10a is a cylinder, 11 is a cylinder case, 12 is a case end, 13 is a case cap, 30 is a rod, 35 is a receiving member, 36 is a coil spring for rebound regulation, 37 is a stopper for rebound regulation, and 40 is a The piston, 50 is a sealing mechanism, 51 is a first support, 52 is a sealing member, 53 is a second support, and 57 is a retaining member.

Claims

[Claims]

1. A rod with a piston attached to the tip is inserted from the open side into a cylinder with one end closed and the other open, and a rod is inserted between the inner peripheral surface of the cylinder near the opening and the outer peripheral surface of the rod. In a hydraulic shock absorber in which a sealing mechanism is fitted and the other end is sealed, a central hole for rod insertion is formed in a first metallic support and a second metallic support; A recess is formed in the body, an annular seal member is fitted into the recess, a second support is applied to the first support on the side of the recess into which the seal member is fitted, and the first support and the second support are connected. A receiving member is attached to a position near the piston of a rod that is coaxially coupled together to form a sealing mechanism, and a piston is attached to the tip of the rod.A coil spring for regulating rebound is fitted into the rod, and the sealing mechanism The center hole of the coil spring is fitted into the rod so that one end of the coil spring can engage the receiving member and the other end can engage the seal mechanism, and the piston, coil spring, seal mechanism, etc. A rod fitted with the rod is inserted into the cylinder, a retaining member is fitted into a slot formed in the cylinder near the opening of the cylinder, a sealing mechanism is removably installed inside the cylinder, and the case is loosely fitted onto the rod. A hydraulic shock absorber characterized in that a cap is removably attached to an end face of an opening of a cylinder, and a stopper for regulating bouncing is attached to a portion near the other end of the rod.