JP2001099211A - Dust cover used for shock absorber - Google Patents

Dust cover used for shock absorber

Info

Publication number
JP2001099211A
JP2001099211A JP27758099A JP27758099A JP2001099211A JP 2001099211 A JP2001099211 A JP 2001099211A JP 27758099 A JP27758099 A JP 27758099A JP 27758099 A JP27758099 A JP 27758099A JP 2001099211 A JP2001099211 A JP 2001099211A
Authority
JP
Japan
Prior art keywords
dust cover
ridge
bellows
cylindrical part
portions
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
JP27758099A
Other languages
Japanese (ja)
Inventor
Masaji Ishigami
正司 石神
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.)
Bridgestone Corp
Original Assignee
Bridgestone 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 Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP27758099A priority Critical patent/JP2001099211A/en
Publication of JP2001099211A publication Critical patent/JP2001099211A/en
Pending legal-status Critical Current

Links

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  • Diaphragms And Bellows (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a dust cover of high durability type hard to generate cracking caused by deterioration with its improved structure of protruding portions and recessed portions of a meandering cylindrical part. SOLUTION: In a dust cover of a meandering cylindrical part made of an elastic body having a plurality of projecting portions toward a radial outside and a plurality of recessed portions toward the radial outside, protrusions are provided at the radial outside of the projecting portions while protrusions at a radial inner side of the recessed portions. In the figure, numerals 1-6, 10, 10a, 10b, 11, 12, 21 and 22 are respectively a cylinder, piston rod, bumper bound, lower seat, upper seat, spring; dust cover; meandering cylindrical part of dust cover; protrusion of meandering cylindrical part; recessed portion in meandering cylindrical part; protrusion on projecting part; protrusion on recessed part.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、ショックアブソー
バーのピストンロッドに取り付けられたバンパーバウン
ドやピストンロッド部分への水や石等の異物の侵入を防
ぐためのダストカバーに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust cover for preventing foreign matters such as water and stones from entering a bumper bound or a piston rod portion of a piston rod of a shock absorber.

【0002】[0002]

【従来の技術】自動車用ショックアブソーバーはシリン
ダーから伸びるピストンロッドにバンパーバウンドが取
り付けられ、バンパーバウンド、シリンダー、ピストン
ロッドへの水や石等の異物の侵入を防ぐために、これら
を囲んでダストカバーを取り付けていた。そして、シリ
ンダーにはロアシートを、ピストンロッドのダストカバ
ー上にはアッパーシートを夫々取り付け、これらの間に
スプリングを取り付けてなるものであり、特に、ダスト
カバーはピストン軸方向の上下に自在に伸縮するように
ゴムなどの弾性体を用いて構成されており、山部及び谷
部を交互に形成した蛇腹状筒部とされている。
2. Description of the Related Art Shock absorbers for automobiles are provided with a bumper bound to a piston rod extending from a cylinder, and a dust cover is provided around the bumper bound, cylinder and piston rod to prevent foreign matter such as water and stones from entering the piston rod. I was attached. The lower seat is attached to the cylinder, the upper seat is attached to the dust cover of the piston rod, and a spring is attached between them. In particular, the dust cover freely expands and contracts vertically in the axial direction of the piston. As described above, the bellows-shaped cylindrical portion is formed by using an elastic body such as rubber, and has a peak portion and a valley portion formed alternately.

【0003】かかる従来のダストカバー構造にあって
は、シリンダーに取り付けられたロアシートが車輪のバ
ウンド及びリバウンドによって、ダストカバーの端部に
当接したり離れたりすることで蛇腹状筒部が伸縮を繰り
返すこととなる。このため、車輪のバウンド時に蛇腹が
縮小する際の山部及び谷部の頂点の外表面に引っ張り応
力が集中して加えられる。従って、山部及び谷部を中心
にゴム等の弾性体の劣化が起こり易く、長時間にわたっ
て使用した後はかかる部位に亀裂が発生し切断にまで発
達してしまう。一方、ダストカバーの伸縮時には、場合
によってはダストカバーの内側特に谷部の頂点がショッ
クアブソーバーのシリンダーやピストンロッドに接触す
ることがあり、かかる接触の繰り返しによってダストカ
バーに亀裂が入ることもある。
In such a conventional dust cover structure, the lower seat attached to the cylinder comes into contact with or separates from the end of the dust cover due to the bounding and rebounding of the wheels, so that the bellows-like cylindrical portion repeatedly expands and contracts. It will be. For this reason, tensile stress is concentrated and applied to the outer surfaces of the peaks and valleys when the bellows shrinks when the wheels bounce. Therefore, the elastic body such as rubber tends to be deteriorated mainly at the peaks and valleys, and after being used for a long period of time, cracks are generated in such portions and the cuts are developed. On the other hand, when the dust cover expands and contracts, the inside of the dust cover, especially the top of the valley, may come into contact with the cylinder or piston rod of the shock absorber, and the dust cover may be cracked by repeated contact.

【0004】従来のダストカバーの一例としては、特開
平8ー49745号公報に記載されたダストカバーがあ
る。これは山部の厚みを大きくすることで蛇腹の収縮時
に山部の頂点に引っ張り応力が集中的に発生することを
防ぐことを目的としたものである。しかるに、この技術
にもいくつかの問題があり、第1には、ダストカバーの
収縮時の山部にかかる引っ張り応力は、その表面に大き
な力がかかり、応力の集中程度は表面形状によるので、
表面形状が同じであると厚みを大きくしても大きな効果
は得られない点、第2にゴム厚を厚くすると多くのゴム
を必要とする点であり、重量も重くなるという点、第3
には山部の耐久性が向上しても谷部の耐久性が改善され
ていない点、第4に折り畳み性に関する配慮はなされて
いない点、等である。
As an example of a conventional dust cover, there is a dust cover described in Japanese Patent Application Laid-Open No. 8-49745. The purpose of this is to prevent the tensile stress from being intensively generated at the peak of the peak when the bellows contracts by increasing the thickness of the peak. However, this technique also has some problems. First, the tensile stress applied to the hill when the dust cover shrinks is a large force applied to the surface, and the degree of concentration of the stress depends on the surface shape.
If the surface shape is the same, a large effect cannot be obtained even if the thickness is increased. Secondly, if the rubber thickness is increased, more rubber is required, and the weight becomes heavy.
Are that the durability of the valleys is not improved even if the durability of the peaks is improved, and fourth, that no consideration is given to the foldability.

【0005】[0005]

【発明が解決しようとする課題】本発明は長時間にわた
って使用しても、ダストカバーの蛇腹状筒部の山部及び
谷部の構造を改良し、この部位が他の部位よりも早期に
劣化による亀裂が発生しにくくしたもので、耐久性の高
いダストカバーを提供することを目的とするものであ
る。
SUMMARY OF THE INVENTION The present invention improves the structure of the peaks and valleys of the bellows-like cylindrical portion of the dust cover even when used for a long time, and this portion deteriorates earlier than other portions. It is an object of the present invention to provide a highly durable dust cover in which cracks are less likely to occur.

【0006】[0006]

【課題を解決するための手段】本発明は上記の欠点を改
良するために発明されたものであり、その要旨は、径方
向外側に向かって凸となる複数の山部と径方向外側に向
かって凹部となる複数の谷部を有する例えばゴム状の弾
性体からなる蛇腹状筒部のダストカバーにおいて、前記
山部の径方向外側に突条を設けると共に前記谷部の径方
向内側に突条を設けたことを特徴とするダストカバーで
ある。そして、好ましくは突条がダストカバーの周方向
に連続するものであり、更に言えば、突条の断面形状が
矩形で、突条の厚みが隣接する厚みの略2倍であるのが
好ましい。
SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned drawbacks, and its gist is that a plurality of ridges projecting outward in the radial direction and a plurality of ridges projecting outward in the radial direction are provided. In a dust cover of a bellows-like cylindrical portion made of, for example, a rubber-like elastic body having a plurality of valleys that become concave portions, a ridge is provided radially outside the ridge and a ridge is radially inside the valley. It is a dust cover characterized by having provided. Preferably, the ridge is continuous in the circumferential direction of the dust cover, and more preferably, the ridge has a rectangular cross-sectional shape, and the thickness of the ridge is approximately twice as large as the adjacent thickness.

【0007】[0007]

【発明の実施の形態】本発明にあっては、蛇腹状筒部の
ダストカバーの山部の外側及び谷部の内側に好ましくは
周方向に連続する突条を形成したものであって、蛇腹状
筒部の伸縮時にこれらの頂点に引っ張り応力が集中する
ことがなく、応力を広く分散させることが可能となった
ものである。そして、谷部の内側の接触摩擦に対しても
対抗できることとなったものである。更に言えば、山部
及び谷部に夫々周方向に連続する突条を形成したこと
は、伸縮に際してダストカバーに予め癖付けがなされた
ものとなり、ダストカバーの折り畳み性が改善されたこ
ととなる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, the dust cover of the bellows-like cylindrical portion is formed with ridges that are preferably continuous in the circumferential direction on the outside of the peak and inside the valley. The tensile stress does not concentrate on these vertices when the tubular portion expands and contracts, and the stress can be widely dispersed. In addition, it is possible to counter the contact friction inside the valley. Furthermore, forming the circumferentially continuous ridges at the peaks and valleys, respectively, means that the dust cover is pre-knitted at the time of expansion and contraction, which means that the foldability of the dust cover has been improved. .

【0008】更に言えば、突条を略矩形にすることで、
折れ曲がり個所を明確に区分することができることとな
ったと共に、突条の厚みと隣接する厚みとを特定の割合
とすることにより、最大収縮時に突条とその隣接する部
分で段差が生じないので折り畳み性が向上することとな
ったものである。
[0008] Furthermore, by making the ridge a substantially rectangular shape,
Bending points can be clearly distinguished, and by setting the thickness of the ridge and the adjacent thickness to a specific ratio, there is no step between the ridge and its adjacent part at maximum contraction, so folding This is to improve the performance.

【0009】[0009]

【実施例】以下、図面をもって本発明のダストカバーを
更に詳細に説明する。図1は本発明のダストカバーを装
着したショックアブソーバーの一部切断側面図である。
かかる自動車用ショックアブソーバーは、シリンダー1
から伸びるピストンロッド2にバンパーバウンド3が取
り付けられ、シリンダー1、ピストンロッド2、バンパ
ーバウンド3への水や石等の異物の侵入を防ぐために、
これらを囲んでダストカバー10を取り付けてある。そ
して、シリンダー1にはロアシート4を取り付け、一
方、ピストンロッド2のダストカバー10上にはアッパ
ーシート5を取り付け、これらの間にスプリング6を取
り付けてある。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dust cover according to the present invention. FIG. 1 is a partially cut-away side view of a shock absorber equipped with a dust cover of the present invention.
Such an automobile shock absorber has a cylinder 1
A bumper bound 3 is attached to a piston rod 2 extending from the cylinder. In order to prevent foreign matter such as water and stones from entering the cylinder 1, the piston rod 2 and the bumper bound 3,
A dust cover 10 is attached around these. A lower sheet 4 is attached to the cylinder 1, while an upper sheet 5 is attached to the dust cover 10 of the piston rod 2, and a spring 6 is attached between them.

【0010】かかるダストカバー10はゴムなどの弾性
体を用いて構成されており、上側を肉厚の筒部10aと
され、下側を蛇腹状筒部10bとし、山部11及び谷部
12を交互に形成したものである。特に、ピストンロッ
ド2の軸方向の上下に自在伸縮するようにゴムなどの弾
性体を用いたものである。
The dust cover 10 is made of an elastic material such as rubber. The upper part is a thick cylindrical part 10a, the lower part is a bellows-like cylindrical part 10b, and the peak part 11 and the valley part 12 are formed. It is formed alternately. In particular, an elastic body such as rubber is used so as to freely expand and contract in the axial direction of the piston rod 2.

【0011】ショックアブソーバーに高い荷重が入力さ
れて大振幅が生じた際にはバンパーバウンド3がつぶ
れ、更に高い荷重が入力されると外側へ広がろうとする
が、かかるダストカバー10はこれを阻止するために筒
部10aが形成されている。一方、大振幅入力時にスト
ロークする蛇腹状筒部10bを備え、かかる蛇腹状筒部
10bはピストン軸方向の上下に自在に伸縮するように
形成されたもので、シリンダー1に取り付けられたロア
シート4が車輪のバウンド及びリバウンドによって、ダ
ストカバー10の端部に当接したり離れたりすることで
蛇腹状筒部10bが伸縮を繰り返すことになる。
When a high load is input to the shock absorber and a large amplitude is generated, the bumper bound 3 is crushed, and when a higher load is input, the bumper bound 3 tends to spread outward, but the dust cover 10 prevents this. For this purpose, a cylindrical portion 10a is formed. On the other hand, a bellows-like cylindrical portion 10b that strokes when a large amplitude is input is provided, and the bellows-like cylindrical portion 10b is formed so as to freely expand and contract vertically in the axial direction of the piston. The bellows-like cylindrical portion 10b repeatedly expands and contracts by coming into contact with and separating from the end of the dust cover 10 due to the bounce and rebound of the wheel.

【0012】さて、本発明のダストカバー10は、図2
に示すように蛇腹状筒部10bの山部11及び谷部12
を交互に形成し、この頂点部分に断面矩形の突条をその
全周に形成したものである。即ち、山部11にあっては
径方向外側に突条21を設け、一方、谷部12にあって
は径方向内側に突条22を設けたものである。かかる突
条21、22はダストカバー10本体の厚さの2倍の高
さとなっている。
Now, the dust cover 10 of the present invention will be described with reference to FIG.
As shown in the figure, the peak 11 and the valley 12 of the bellows-like cylindrical portion 10b
Are formed alternately, and ridges having a rectangular cross section are formed on the entire periphery of the ridges. That is, the ridges 11 are provided with the ridges 21 on the radially outer side, while the valleys 12 are provided with the ridges 22 on the radially inner side. These ridges 21 and 22 are twice as high as the thickness of the dust cover 10 main body.

【0013】このように、本発明のダストカバー10は
山部11と谷部12に共に突条21、22を設けたこと
によって、蛇腹状筒部10bが伸縮を繰り返す場合であ
ってもダストカバー1−全体に引っ張り応力が分散さ
れ、山部11や谷部12に応力が集中することを避ける
ことが可能となったものである。又、谷部12の内側に
形成された突条22は繰り返し接触による蛇腹状筒部1
0bの摩耗に対抗することとなり、ダストカバー10の
寿命を向上することにも役立つものである。
As described above, the dust cover 10 of the present invention is provided with the projections 21 and 22 at both the peaks 11 and the valleys 12, so that the dust cover 10 can be used even when the bellows-like cylindrical portion 10b repeatedly expands and contracts. 1- Tensile stress is dispersed throughout, so that stress can be prevented from being concentrated on the peaks 11 and the valleys 12. In addition, the ridge 22 formed inside the valley 12 has a bellows-like cylindrical portion 1 due to repeated contact.
0b, which is useful for improving the life of the dust cover 10.

【0014】[0014]

【発明の効果】以上説明したように、本発明におけるダ
ストカバーは、上記の構成としたことにより、蛇腹状筒
部に加わる引っ張り応力が山部及び谷部の周辺全体に分
散されるので、長時間に渡って使用しても山部及び谷部
に他の部位よりも早期に劣化することもなくなり、耐久
性の高いダストカバーを提供できたものである。
As described above, the dust cover of the present invention having the above-described structure disperses the tensile stress applied to the bellows-like cylindrical portion over the entire periphery of the peaks and valleys. Even if used over time, the peak and valley portions are not deteriorated earlier than other portions, and a highly durable dust cover can be provided.

【図面の簡単な説明】[Brief description of the drawings]

【図1】図1は本発明のダストカバーを装着したショッ
クアブソーバーの一部切断側面図である。
FIG. 1 is a partially cut-away side view of a shock absorber equipped with a dust cover of the present invention.

【図2】図2はダストカバーの部分拡大図である。FIG. 2 is a partially enlarged view of a dust cover.

【符号の説明】[Explanation of symbols]

1‥シリンダー、 2‥ピストンロッド、 3‥バンパーバウンド、 4‥ロアシート、 5‥アッパーシート、 6‥スプリング、 10‥ダストカバー、 10a‥ダストカバーの上端筒部、 10b‥ダストカバーの蛇腹状筒部、 11‥ダストカバーの蛇腹状筒部における山部、 12‥ダストカバーの蛇腹状筒部における谷部、 21‥山部に形成された突条、 22‥谷部に形成された突条。 1 ‥ cylinder, 2 ‥ piston rod, 3 ‥ bumper bound, 4 ‥ lower seat, 5 ‥ upper seat, 6 ‥ spring, 10 ‥ dust cover, 10a ‥ upper end cylinder of dust cover, 10b ‥ bellows cylinder of dust cover 11) a peak in the bellows-shaped cylindrical portion of the dust cover; 12) a valley in the bellows-shaped cylindrical portion of the dust cover; 21) a ridge formed in the ridge;

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 径方向外側に向かって凸となる複数の山
部と径方向外側に向かって凹部となる複数の谷部を有す
る弾性体からなる蛇腹状筒部のダストカバーにおいて、
前記山部の径方向外側に突条を設けると共に前記谷部の
径方向内側に突条を設けたことを特徴とするダストカバ
ー。
1. A bellows-shaped cylindrical dust cover made of an elastic body having a plurality of peaks projecting radially outward and a plurality of valleys recessed radially outward,
A dust cover, wherein a ridge is provided on a radially outer side of the peak portion and a ridge is provided on a radially inner side of the valley portion.
【請求項2】 突条がダストカバーの周方向に連続する
請求項1記載のダストカバー。
2. The dust cover according to claim 1, wherein the ridge is continuous in a circumferential direction of the dust cover.
【請求項3】 突条の断面形状が矩形である請求項1記
載のダストカバー。
3. The dust cover according to claim 1, wherein the ridge has a rectangular cross section.
【請求項4】 突条の厚みが、山部に隣接する厚みの略
2倍である請求項1のダストカバー。
4. The dust cover according to claim 1, wherein the thickness of the ridge is substantially twice the thickness adjacent to the peak.
【請求項5】 弾性体がゴムである請求項1乃至3記載
のダストカバー。
5. The dust cover according to claim 1, wherein the elastic body is rubber.
JP27758099A 1999-09-29 1999-09-29 Dust cover used for shock absorber Pending JP2001099211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27758099A JP2001099211A (en) 1999-09-29 1999-09-29 Dust cover used for shock absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27758099A JP2001099211A (en) 1999-09-29 1999-09-29 Dust cover used for shock absorber

Publications (1)

Publication Number Publication Date
JP2001099211A true JP2001099211A (en) 2001-04-10

Family

ID=17585459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27758099A Pending JP2001099211A (en) 1999-09-29 1999-09-29 Dust cover used for shock absorber

Country Status (1)

Country Link
JP (1) JP2001099211A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009011067A1 (en) * 2009-02-28 2010-09-02 Volkswagen Ag Vibration damper for use as component of damper strut of vehicle, has piston-cylinder unit with axially movable piston rod, which is encased by protective tube outside cylinder, where protective tube has bends
KR100996865B1 (en) 2005-04-27 2010-11-29 주식회사 만도 Dust cover for reducing noise in shock absorber and vehicle suspension
KR101461892B1 (en) * 2013-06-21 2014-11-13 현대자동차 주식회사 Shock absorber housing for vehicle
JP2015075215A (en) * 2013-10-11 2015-04-20 株式会社ショーワ Cover member

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100996865B1 (en) 2005-04-27 2010-11-29 주식회사 만도 Dust cover for reducing noise in shock absorber and vehicle suspension
DE102009011067A1 (en) * 2009-02-28 2010-09-02 Volkswagen Ag Vibration damper for use as component of damper strut of vehicle, has piston-cylinder unit with axially movable piston rod, which is encased by protective tube outside cylinder, where protective tube has bends
KR101461892B1 (en) * 2013-06-21 2014-11-13 현대자동차 주식회사 Shock absorber housing for vehicle
US9242677B2 (en) 2013-06-21 2016-01-26 Hyundai Motor Company Shock absorber housing for vehicle
JP2015075215A (en) * 2013-10-11 2015-04-20 株式会社ショーワ Cover member

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