JPH1019078A - Oil seal for hydraulic shock absorber - Google Patents
Oil seal for hydraulic shock absorberInfo
- Publication number
- JPH1019078A JPH1019078A JP8173183A JP17318396A JPH1019078A JP H1019078 A JPH1019078 A JP H1019078A JP 8173183 A JP8173183 A JP 8173183A JP 17318396 A JP17318396 A JP 17318396A JP H1019078 A JPH1019078 A JP H1019078A
- Authority
- JP
- Japan
- Prior art keywords
- oil seal
- shock absorber
- hydraulic shock
- core
- folded
- 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
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は油圧緩衝器のロッド
の摺動に伴うオイルの漏れを防止するオイルシールに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal for preventing oil from leaking due to sliding of a rod of a hydraulic shock absorber.
【０００２】[0002]
【従来の技術】図５に従来の一般的な構造の油圧緩衝器
の端部構造を示す。この油圧緩衝器は外筒１００と内筒
１０１を備え、内筒１０１の上端にピストンロッド１０
２に摺接するロッドガイド１０３を設け、このロッドガ
イド１０３と外筒１００上端の加締め部１００ａとの間
でオイルシール１０４を保持し、さらに外筒１００上端
にはキャップ１０５を設けている。2. Description of the Related Art FIG. 5 shows an end structure of a conventional hydraulic shock absorber having a general structure. This hydraulic shock absorber includes an outer cylinder 100 and an inner cylinder 101, and a piston rod 10 is provided at an upper end of the inner cylinder 101.
2, an oil seal 104 is held between the rod guide 103 and the caulked portion 100a at the upper end of the outer cylinder 100, and a cap 105 is provided at the upper end of the outer cylinder 100.
【０００３】オイルシール１０４は芯金１０６と、この
芯金１０６に対し射出成形等により一体的に形成される
ラバー材１０７とからなり、ラバー材１０７の内端部に
はピストンロッド１０２の外周面に摺接して埃の侵入を
防ぐダストリップ部１０８及びロッドに付着しているオ
イルを掻き落とすリップ部１０９が設けられている。[0003] The oil seal 104 comprises a metal core 106 and a rubber material 107 integrally formed with the metal core 106 by injection molding or the like. The inner end of the rubber material 107 has an outer peripheral surface of the piston rod 102. There is provided a dust lip portion 108 for slidingly contacting with the dust and a lip portion 109 for scraping off oil adhering to the rod.
【０００４】また、前記加締め部１００ａと芯金１０６
の間にはエンドプレート１１０が設けられている。この
エンドプレート１１０は嵩上げと補強を目的として設け
られるものである。即ち、エンドプレート１１０を設け
ずに加締め部１００ａが直接芯金１０６の上を押えるよ
うにすると、その分だけキャップ１０５が下方に位置す
るため、キャップ１０５がリップ部１０８に干渉してし
まう。因みにリップ部の寸法を変更することはオイルシ
ール１０４の機能に影響を及ぼすため好ましくない。そ
こで、エンドプレート１１０で調整を行っている。Further, the caulking portion 100a and the core metal 106
An end plate 110 is provided therebetween. The end plate 110 is provided for the purpose of raising and reinforcing. In other words, if the crimping portion 100a directly presses on the cored bar 106 without providing the end plate 110, the cap 105 is located at the lower portion by that amount, so that the cap 105 interferes with the lip portion 108. Incidentally, changing the size of the lip portion is not preferable because it affects the function of the oil seal 104. Therefore, adjustment is performed using the end plate 110.
【０００５】[0005]
【発明が解決しようとする課題】上記した従来の構造に
あっては、エンドプレートを設けているため、部品点数
と組付工数の増加を招いている。またエンドプレートを
設ける代りに、キャップの形状をリップ部との干渉を回
避できる形状にすることも考えられるが、キャップの形
状を複雑なものにしなければならず、現実的でない。ま
た、バンプキャップとダストリップとのクリアランスの
縮小に伴い、ダンパーのフルボトム時等、バンプキャッ
プ上部にあるストッパラバーからのエア抜け通孔を確保
できなくなるため、ダストリップ内へ異物を押し込んで
しまう。そこで、芯金を切削加工又は鍛造加工すること
で、芯金の外周部を厚肉にすることも考えられるが、加
工が面倒でコストアップにつながる。In the above-mentioned conventional structure, since the end plate is provided, the number of parts and the number of assembling steps are increased. Also, instead of providing the end plate, it is conceivable to make the shape of the cap a shape that can avoid interference with the lip portion, but the shape of the cap must be complicated, which is not practical. Further, with the reduction of the clearance between the bump cap and the dust lip, it becomes impossible to secure the air bleeding hole from the stopper rubber located above the bump cap, such as when the damper is full bottom, so that foreign substances are pushed into the dust lip. Therefore, it is conceivable to make the outer peripheral portion of the core metal thicker by cutting or forging the core metal, but the processing is troublesome and leads to an increase in cost.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決すべく本
発明に係る油圧緩衝器のオイルシールは、補強用の芯金
となる１枚の金属プレートの外周部を折り返すことで厚
肉部とし、この厚肉部をロッドガイドと外筒端部の加締
め部との間で保持するようにした。SUMMARY OF THE INVENTION In order to solve the above problems, an oil seal of a hydraulic shock absorber according to the present invention is formed as a thick part by folding an outer peripheral portion of a metal plate serving as a reinforcing metal core. The thick portion is held between the rod guide and the caulked portion at the end of the outer cylinder.
【０００７】前記芯金となる金属プレートとしては、折
り返す部分に沿って肉抜き溝を形成したものとすること
ができる。このような構成とすることで、折り返しが容
易になるとともに、厚肉部のエッジ部のアールが加締め
部内側のアールにほぼ一致するため、オイルシールの保
持と位置出しが確実に行える。[0007] The metal plate serving as the core metal may be formed with a lightening groove along a folded portion. By adopting such a configuration, the folding is facilitated, and the radius of the edge portion of the thick portion approximately matches the radius of the inside of the caulked portion, so that the oil seal can be reliably held and positioned.
【０００８】また、前記芯金の厚肉部は複数の折り返し
部にて構成し、これら折り返し部間に隙間を形成するよ
うにすれば、射出成形等によってラバー材を型内に流し
込む際に、当該隙間を介して行き渡るため、厚肉部上面
にラバー材が廻り込むことが防げ、成形が確実になされ
る。The thick part of the metal core is constituted by a plurality of folded portions, and if a gap is formed between these folded portions, when the rubber material is poured into the mold by injection molding or the like, Since the rubber material spreads through the gap, it is possible to prevent the rubber material from wrapping around the upper surface of the thick portion, and the molding can be reliably performed.
【０００９】[0009]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。図１は本発明に係るオイルシ
ールを適用した油圧緩衝器の要部断面図である。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of a hydraulic shock absorber to which an oil seal according to the present invention is applied.
【００１０】油圧緩衝器は外筒１と内筒２を備え、内筒
２内はピストンロッド３の下端に取り付けたピストンに
て上部油室と下部油室とに分けられ、外筒１と内筒２と
の間には油溜室を形成している。The hydraulic shock absorber includes an outer cylinder 1 and an inner cylinder 2. The inner cylinder 2 is divided into an upper oil chamber and a lower oil chamber by a piston attached to a lower end of a piston rod 3. An oil reservoir is formed between the cylinder 2.
【００１１】前記内筒２の上端部にはロッドガイド４を
設け、ロッドガイド４に設けたブッシュ５にてピストン
ロッド３の外周を摺接・保持し、またロッドガイド４と
外筒１上端の加締め部１ａとの間にオイルシール６を保
持し、更に外筒１の上端開口はキャップ７にて閉じられ
ている。A rod guide 4 is provided at the upper end of the inner cylinder 2, and the outer periphery of the piston rod 3 is slid and held by a bush 5 provided on the rod guide 4. An oil seal 6 is held between the caulked portion 1a and the upper end opening of the outer cylinder 1 is closed by a cap 7.
【００１２】ここで、図２（ａ）は芯金となる金属プレ
ートの折り返し前の状態を示す平面図、（ｂ）は同金属
プレートを折り返した芯金の平面図、図３（ａ）は芯金
となる金属プレートの折り返し前の要部拡大断面図、
（ｂ）は同金属プレートを折り返した芯金の要部拡大断
面図であり、オイルシール６は芯金８とラバー材９とか
らなり、芯金８となる金属プレート１０は、図２（ａ）
に示すように、外周部に等間隔で切欠１１を形成するこ
とで複数の折り返し部１２…を形成し、また折り返す部
分に沿って肉抜き溝１３，１４，１５が形成されてい
る。Here, FIG. 2A is a plan view showing a state before the metal plate serving as the metal core is folded, FIG. 2B is a plan view of the metal core obtained by folding the metal plate, and FIG. Main part enlarged cross-sectional view of metal plate serving as core metal before folding back,
2B is an enlarged cross-sectional view of a main part of the metal core obtained by folding the metal plate. The oil seal 6 includes a metal core 8 and a rubber material 9, and the metal plate 10 serving as the metal core 8 is shown in FIG. )
As shown in FIG. 5, a plurality of folded portions 12 are formed by forming notches 11 at equal intervals in the outer peripheral portion, and lightening grooves 13, 14, 15 are formed along the folded portions.
【００１３】そして、上記の折り返し部１２を肉抜き溝
１３，１４，１５に沿って折り返すことで、図２（ｂ）
及び図３（ｂ）に示すように外周部が厚肉部となった芯
金８が得られる。ここで、肉抜き溝を設けることで、折
り返しが容易になるが、特に肉抜き溝１３を設けること
で芯金８の厚肉部の角のアールが９０°に近づき、加締
め部１ａの内側コーナ部との間に隙間が生じにくくな
る。Then, the above-mentioned folded portion 12 is folded along the lightening grooves 13, 14, and 15, whereby FIG.
And as shown in FIG.3 (b), the core metal 8 whose outer peripheral part became the thick part is obtained. Here, the provision of the lightening groove facilitates folding, but particularly, by providing the lightening groove 13, the radius of the corner of the thick portion of the core bar 8 approaches 90 °, and the inside of the caulked portion 1a is formed. A gap is less likely to be formed between the corners.
【００１４】また、芯金８となった状態で隣接する折り
返し部１２，１２間には隙間１６が形成される。この隙
間１６が存在することで、芯金８を金型内にセットし、
型内にラバー材の原料を流し込んで、成形する際に、隙
間１６を介してラバー材の原料が型内の必要箇所まで確
実に行き渡る。Further, a gap 16 is formed between the adjacent folded portions 12 in the state of the core bar 8. With the presence of the gap 16, the core metal 8 is set in the mold,
When the raw material of the rubber material is poured into the mold and molded, the raw material of the rubber material surely reaches the required portion in the mold through the gap 16.
【００１５】芯金８と一体化される型内にラバー材９に
はリップ部１７，１８，１９及びガスシール２０が形成
される。リップ部１７にて外部からのダストの侵入を阻
止し、リップ部１８でピストンロッド３外周面に付着し
ている作動油を掻き落とし、更に掻き落とされた作動油
はリップ部１９を撓ませて、ガスシール２０及びロッド
ガイド４と外筒１との隙間を通って油溜室に戻される。The rubber material 9 is provided with lips 17, 18, 19 and a gas seal 20 in a mold integrated with the cored bar 8. The lip 17 prevents dust from entering from outside, the lip 18 scrapes off the hydraulic oil adhering to the outer peripheral surface of the piston rod 3, and the scraped hydraulic oil causes the lip 19 to bend. Is returned to the oil reservoir through the gas seal 20 and the gap between the rod guide 4 and the outer cylinder 1.
【００１６】図４は芯金の別実施例を示す断面図であ
り、この実施例のように前記実施例と折り返し方向を異
ならせることが可能である。但し、外周の厚肉部が薄肉
の中央部に比較して、加締め部１ａ側に突出しているこ
とが必要である。FIG. 4 is a cross-sectional view showing another embodiment of the cored bar. As in this embodiment, the folding direction can be made different from that of the above embodiment. However, it is necessary that the thick part on the outer periphery protrudes toward the caulking part 1a compared to the central part with a small thickness.
【００１７】[0017]
【発明の効果】以上に説明したように本発明によれば、
オイルシールのリップ部及びキャップの寸法と形状を変
更することなく従来のエンドプレートを廃止したため、
部品点数及び組付工数の削減を図りつつキャップとリッ
プ部とのクリアランスを確保でき、確実なシール効果を
発揮できる。According to the present invention as described above,
Because the conventional end plate was abolished without changing the size and shape of the oil seal lip and cap,
The clearance between the cap and the lip can be secured while reducing the number of parts and the number of assembling steps, and a reliable sealing effect can be exhibited.
【００１８】また、芯金となる金属プレートの折り返す
部分に沿って肉抜き溝を形成しておくことで、折り返し
作業が容易になるとともに、厚肉部のエッジ部のアール
が加締め部内側のアールにほぼ一致するため、オイルシ
ールの保持と位置出しが確実に行える。Further, by forming a lightening groove along the turn-back portion of the metal plate serving as the metal core, the turn-up operation is facilitated, and the radius of the edge portion of the thick portion is formed inside the crimping portion. Since it almost matches the radius, the oil seal can be reliably held and positioned.
【００１９】更に、芯金の厚肉部を複数の折り返し部に
て構成し、これら折り返し部間に隙間を形成するように
すれば、射出成形等によってラバー材を型内に流し込む
際に、当該隙間を介してラバー材が行き渡るため、成形
が確実になされる。Further, if the thick portion of the core metal is constituted by a plurality of folded portions and a gap is formed between the folded portions, the rubber material is poured into the mold by injection molding or the like. Since the rubber material spreads through the gap, the molding is reliably performed.
【図１】本発明に係るオイルシールを適用した油圧緩衝
器の要部断面図FIG. 1 is a sectional view of a main part of a hydraulic shock absorber to which an oil seal according to the present invention is applied.
【図２】（ａ）は芯金となる金属プレートの折り返し前
の状態を示す平面図、（ｂ）は同金属プレートを折り返
した芯金の平面図2A is a plan view showing a state before a metal plate serving as a metal core is folded, and FIG. 2B is a plan view showing a metal core obtained by folding the metal plate.
【図３】（ａ）は芯金となる金属プレートの折り返し前
の要部拡大断面図、（ｂ）は同金属プレートを折り返し
た芯金の要部拡大断面図3A is an enlarged cross-sectional view of a main part of a metal plate serving as a metal core before being folded, and FIG. 3B is an enlarged cross-sectional view of a main part of the metal core obtained by folding the metal plate.
【図４】芯金の別実施例を示す断面図FIG. 4 is a sectional view showing another embodiment of the cored bar.
【図５】従来のオイルシールを適用した油圧緩衝器の要
部断面図FIG. 5 is a sectional view of a main part of a hydraulic shock absorber to which a conventional oil seal is applied.
１…外筒１、２…内筒、３…ピストンロッド、４…ロッ
ドガイド、６…オイルシール、７…キャップ、８…芯
金、９…ラバー材、１０…金属プレート、１１…切欠、
１２…折り返し部、１３，１４，１５…肉抜き溝、１６
…隙間、１７，１８，１９…リップ部。DESCRIPTION OF SYMBOLS 1 ... Outer cylinder 1, 2 ... Inner cylinder, 3 ... Piston rod, 4 ... Rod guide, 6 ... Oil seal, 7 ... Cap, 8 ... Core metal, 9 ... Rubber material, 10 ... Metal plate, 11 ... Notch,
12 ... folded part, 13, 14, 15 ... lightening groove, 16
... gaps, 17, 18, 19 ... lip parts.
Claims (3)
端部の加締め部との間で保持されるオイルシールにおい
て、このオイルシールは芯金にラバー材を一体化して構
成され、前記芯金は環状をなす１枚の金属プレートの外
周部を折り返すことで厚肉部とし、この厚肉部を前記加
締め部で保持することを特徴とする油圧緩衝器のオイル
シール。1. An oil seal held between a rod guide provided in an outer cylinder and a caulked portion at an end of the outer cylinder, wherein the oil seal is formed by integrating a rubber material with a cored bar. An oil seal for a hydraulic shock absorber, wherein the metal core is formed into a thick portion by folding an outer peripheral portion of one annular metal plate, and the thick portion is held by the caulked portion.
ールにおいて、前記芯金となる金属プレートは、折り返
す部分に沿って肉抜き溝が形成されていることを特徴と
する油圧緩衝器のオイルシール。2. An oil seal for a hydraulic shock absorber according to claim 1, wherein the metal plate serving as the core bar has a lightening groove formed along a folded portion. Oil seal.
ールにおいて、前記芯金の厚肉部は複数の折り返し部か
らなり、これら折り返し部間には隙間が形成されている
ことを特徴とする油圧緩衝器のオイルシール。3. The oil seal for a hydraulic shock absorber according to claim 1, wherein the thick portion of the core bar includes a plurality of folded portions, and a gap is formed between the folded portions. Hydraulic shock absorber oil seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8173183A JPH1019078A (en) | 1996-07-03 | 1996-07-03 | Oil seal for hydraulic shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8173183A JPH1019078A (en) | 1996-07-03 | 1996-07-03 | Oil seal for hydraulic shock absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1019078A true JPH1019078A (en) | 1998-01-20 |
Family
ID=15955640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8173183A Pending JPH1019078A (en) | 1996-07-03 | 1996-07-03 | Oil seal for hydraulic shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1019078A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003194126A (en) * | 2001-12-26 | 2003-07-09 | Kayaba Ind Co Ltd | Seal protecting structure |
| JP2010127443A (en) * | 2008-12-01 | 2010-06-10 | Kayaba Ind Co Ltd | Insert metal |
| JP2012149725A (en) * | 2011-01-20 | 2012-08-09 | Nok Corp | Sealing device, and method of manufacturing the same |
| KR101188250B1 (en) | 2007-10-09 | 2012-10-05 | 주식회사 만도 | Cap structure of shock absorber |
| JP2012237454A (en) * | 2012-08-09 | 2012-12-06 | Kyb Co Ltd | Insert metal |
| KR101217274B1 (en) * | 2007-06-16 | 2012-12-31 | 주식회사 만도 | Upper cap of shock absorber |
| JPWO2014002562A1 (en) * | 2012-06-25 | 2016-05-30 | イーグル工業株式会社 | Sealing device |
-
1996
- 1996-07-03 JP JP8173183A patent/JPH1019078A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003194126A (en) * | 2001-12-26 | 2003-07-09 | Kayaba Ind Co Ltd | Seal protecting structure |
| KR101217274B1 (en) * | 2007-06-16 | 2012-12-31 | 주식회사 만도 | Upper cap of shock absorber |
| KR101188250B1 (en) | 2007-10-09 | 2012-10-05 | 주식회사 만도 | Cap structure of shock absorber |
| JP2010127443A (en) * | 2008-12-01 | 2010-06-10 | Kayaba Ind Co Ltd | Insert metal |
| JP2012149725A (en) * | 2011-01-20 | 2012-08-09 | Nok Corp | Sealing device, and method of manufacturing the same |
| JPWO2014002562A1 (en) * | 2012-06-25 | 2016-05-30 | イーグル工業株式会社 | Sealing device |
| JP2012237454A (en) * | 2012-08-09 | 2012-12-06 | Kyb Co Ltd | Insert metal |
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