JPH0968247A - Bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of abnormal sounding when the bush is in use, and concurrently enhance the durability of the bush. SOLUTION: An elastic member 13 is interposed between an inner cylinder 11 and an outer cylinder 12, which are coaxially disposed, so as to be integrally formed into a bush body 10. Air gaps 13a and 13b penetrated through in the axial direction are formed in the elastic member 13, let the leg parts 22 and 23 of a stopper member 20 assembled with the bush body 10 enter in the air gaps 13a and 13b. A plurality of grooves 22a and 23a are provided over the outer circumferential surfaces of the leg parts 22 and 23 in the circumferential direction, the inner circumferential surfaces of the air gaps 13a and 13b are prevented from being in contact with the whole surfaces of the outer circumferential surfaces of the leg parts 22 and 23 even if external force in the direction normal to the axial direction is applied to the outer cylinder 12. Under this condition, even if twisting force is applied to the bush body 10, foreign matters such as air, water, mud, ice, dust and the like in the contact portion can thereby be expelled outside through the grooves 22a and 23a.

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、例えば車両のサス
ペンション装置に組み込まれるブッシュに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush incorporated in, for example, a suspension device of a vehicle.

【０００２】[0002]

【従来の技術】従来から、この種のブッシュとしては、
例えば特開平５−１０３５９号公報に示されているよう
に、同軸的に配置された内筒と外筒との間に弾性部材を
介装して固着してなるとともに同弾性部材に軸線方向へ
貫通した空隙を形成してなるブッシュ本体と、ブッシュ
本体に組み付けられて一部を前記空隙に侵入させてなる
ストッパ部材とからなるものが知られている。2. Description of the Related Art Conventionally, as this type of bush,
For example, as disclosed in JP-A-5-10359, an elastic member is interposed and fixed between an inner cylinder and an outer cylinder which are coaxially arranged, and the elastic member is axially attached to the elastic member. It is known that a bush main body is formed with a pierced space, and a stopper member is attached to the bush main body and a part of the stopper member is inserted into the space.

【０００３】[0003]

【発明が解決しようとする課題】しかし、上記従来のブ
ッシュにあっては、外筒に軸線方向と直角方向の外力が
作用した状態でブッシュ本体にこじり力が作用すると、
弾性部材の空隙内周面と同内周面に対向したストッパ部
材の外周面とが面全体で接触した状態で擦れるために、
接触部分に空気、水、泥などがたまっていたり、氷が付
着している場合、不快な異音が発生する。また、同接触
部分に泥、ほこりなどがたまっている場合には、弾性部
材とストッパ部材との接触面の摩耗も大きく、ブッシュ
の耐久性が悪化する。However, in the above-mentioned conventional bush, when a prying force acts on the bush body with an external force acting on the outer cylinder in a direction perpendicular to the axial direction,
Since the inner peripheral surface of the void of the elastic member and the outer peripheral surface of the stopper member facing the inner peripheral surface rub against each other in the state of being in contact with each other,
If air, water, mud, etc. is accumulated in the contact area or ice is adhered, an unpleasant noise is generated. Further, when mud, dust, etc. are accumulated at the contact portion, the contact surface between the elastic member and the stopper member is greatly worn, and the durability of the bush is deteriorated.

【０００４】本発明は上記問題に対処するためになされ
たもので、その目的は、異音が発生しないとともに耐久
性の良好なブッシュを提供しようとするものである。The present invention has been made to solve the above problems, and an object of the present invention is to provide a bush which does not generate abnormal noise and has good durability.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本発明の構成上の特徴は、同軸的に配置された内筒
と外筒との間に弾性部材を介装して固着してなるととも
に同弾性部材に軸線方向へ貫通した空隙を形成してなる
ブッシュ本体と、ブッシュ本体に組み付けられて一部を
前記空隙に侵入させてなるストッパ部材とからなるブッ
シュにおいて、弾性部材の空隙内周面又は同内周面に対
向するストッパ部材の外周面に複数の溝を設けたことに
ある。In order to achieve the above object, the structural feature of the present invention is that an elastic member is interposed between an inner cylinder and an outer cylinder which are coaxially arranged and fixed. And a bushing body formed by forming a gap that penetrates the elastic member in the axial direction, and a stopper member that is assembled to the bushing body and partially penetrates into the gap. A plurality of grooves are provided on the inner peripheral surface or the outer peripheral surface of the stopper member facing the inner peripheral surface.

【０００６】[0006]

【発明の作用効果】上記のように構成した本発明におい
ては、弾性部材の空隙内周面又は同内周面に対向するス
トッパ部材の外周面に複数の溝を設けたので、外筒に軸
方向と直角方向の外力が作用しても、弾性部材の空隙内
周面と同内周面に対向したストッパ部材の外周面とが面
全体で接触することはなく、溝部において非接触に保た
れる。したがって、この状態でブッシュ本体にこじり力
が作用しても、接触部分にたまった空気、水、泥、氷、
ほこりなどは溝を介して外部に放出され、前記こじり力
が作用した状態でも異音を発生することがなくなる。ま
た、泥、ほこりなどによる弾性部材とストッパ部材との
接触面の摩耗も少なくなり、ブッシュの耐久性も向上す
る。According to the present invention constructed as described above, since a plurality of grooves are provided on the inner peripheral surface of the cavity of the elastic member or the outer peripheral surface of the stopper member facing the inner peripheral surface, the outer cylinder is provided with the shaft. Even if an external force in the direction perpendicular to the direction is applied, the inner peripheral surface of the cavity of the elastic member and the outer peripheral surface of the stopper member facing the inner peripheral surface do not come into contact with each other over the entire surface and are kept in non-contact with each other in the groove portion. Be done. Therefore, even if the bush body is twisted in this state, air, water, mud, ice, etc.
Dust or the like is discharged to the outside through the groove, and no abnormal noise is generated even when the prying force is applied. Further, wear of the contact surface between the elastic member and the stopper member due to mud and dust is reduced, and the durability of the bush is improved.

【０００７】[0007]

【発明の実施の形態】以下、本発明の一実施形態を図面
を用いて説明すると、図１は同実施形態に係り車両用サ
スペンション装置内に組み込まれるブッシュの縦断正面
図であり、図２は図１のブッシュの左側面図である。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional front view of a bush incorporated in a vehicle suspension device according to the embodiment, and FIG. It is a left view of the bush of FIG.

【０００８】このブッシュは、円筒状に金属成形した内
筒１１及び外筒１２と、内筒１１及び外筒１２との間に
介装して固着したゴムなどからなる弾性部材１３とを一
体的に構成したブッシュ本体１０を備えている。弾性部
材１３は同軸的に配置した内筒１１と外筒１２との間に
加硫接合されて形成され、同部材１３には周方向に沿っ
た一対の長孔が軸線方向に貫通して空隙１３ａ，１３ｂ
を形成している。なお、弾性部材１３の端面であって内
筒１１の外周面に接するように設けられた方形状の一対
の突起１３ｃ，１３ｄは、ブッシュをサスペンションア
ームに圧入固定する際の位置決め用のものである。The bush integrally includes an inner cylinder 11 and an outer cylinder 12 which are formed into a metal in a cylindrical shape, and an elastic member 13 made of rubber or the like which is interposed and fixed between the inner cylinder 11 and the outer cylinder 12. The bush main body 10 configured as described above is provided. The elastic member 13 is formed by vulcanization joining between the inner cylinder 11 and the outer cylinder 12 that are coaxially arranged, and a pair of elongated holes extending in the circumferential direction penetrates the same member 13 in the axial direction to form a gap. 13a, 13b
Is formed. The pair of rectangular projections 13c and 13d provided on the end surface of the elastic member 13 so as to contact the outer peripheral surface of the inner cylinder 11 are for positioning when the bush is press-fitted and fixed to the suspension arm. .

【０００９】このブッシュ本体１０には、ストッパ部材
２０が組み付けられている。ストッパ部材２０は、弾性
部材１３より硬質のゴム、金属にゴムを加硫させたも
の、樹脂などの剛性の比較的高い材料により一体成形さ
れており、環状部２１と一対の脚部２２，２３とからな
る。環状部２１の内径は内筒１１の外径にほぼ等しく設
定され、同環状部２１は内筒１１の端部外周面上に圧入
固定されている。脚部２２，２３は環状部２１の相対向
する位置から軸線方向に延設されており、弾性部材１３
に設けた空隙１３ａ，１３ｂ内に侵入している。ストッ
パ部材２０の組付け状態にて空隙１３ａ，１３ｂの内周
面に対向する脚部２２，２３の外周面上には、図３に示
すように、複数の溝２２ａ，２３ａが周方向に沿って設
けられている。A stopper member 20 is attached to the bush body 10. The stopper member 20 is integrally formed of a material having a relatively high rigidity such as rubber harder than the elastic member 13, metal vulcanized rubber, or resin, and has an annular portion 21 and a pair of leg portions 22, 23. Consists of. The inner diameter of the annular portion 21 is set to be substantially equal to the outer diameter of the inner cylinder 11, and the annular portion 21 is press-fitted and fixed onto the outer peripheral surface of the end portion of the inner cylinder 11. The leg portions 22 and 23 extend in the axial direction from the positions of the annular portion 21 facing each other, and the elastic member 13
Has penetrated into the voids 13a and 13b provided in the. As shown in FIG. 3, a plurality of grooves 22a and 23a are formed along the circumferential direction on the outer peripheral surfaces of the leg portions 22 and 23 facing the inner peripheral surfaces of the gaps 13a and 13b when the stopper member 20 is assembled. Is provided.

【００１０】なお、ストッパ部材２０の環状部２１の端
部外周面上に設けた切欠き２１ａ，２１ｂは、その形状
によりストッパ部材２０の材質などの種類の違いを表す
ものである。これにより、ブッシュ本体１０を共通にし
て種々の特性のストッパ部材２０をブッシュ本体１０に
組み付けた場合に、切欠き２１ａ，２１ｂの形状により
ブッシュの特性を識別できるようになる。The notches 21a and 21b provided on the outer peripheral surface of the end portion of the annular portion 21 of the stopper member 20 show different kinds of materials such as the material of the stopper member 20 depending on their shapes. Accordingly, when the stopper member 20 having various characteristics is attached to the bush body 10 with the bush body 10 being common, the characteristics of the bush can be identified by the shapes of the notches 21a and 21b.

【００１１】次に、上記のように構成したブッシュの作
用について説明すると、ストッパ部材２０を内筒１１上
に組み付けた状態では、図１に示すように、ストッパ部
材２０の脚部２２，２３の内周面は弾性部材１３の空隙
１３ａ，１３ｂの内周面に当接している。また、この状
態では、脚部２２，２３の外周面は弾性部材１３の空隙
１３ａ，１３ｂの内周面から若干離れている。Next, the operation of the bush configured as described above will be explained. When the stopper member 20 is assembled on the inner cylinder 11, as shown in FIG. The inner peripheral surface is in contact with the inner peripheral surfaces of the voids 13a and 13b of the elastic member 13. Further, in this state, the outer peripheral surfaces of the leg portions 22 and 23 are slightly apart from the inner peripheral surfaces of the voids 13a and 13b of the elastic member 13.

【００１２】一方、前記のようにストッパ部材２０を組
み付けたブッシュを車両のサスペンション装置内に組み
込んだ状態で、図４の矢印で示すような軸線方向と直角
な方向から外筒１２に外力が付与されると、ストッパ部
材２０の脚部２２の外周面は弾性部材１３の空隙１３ａ
の内周面に当接する。しかし、ストッパ部材２０の脚部
２２の外周面には複数の溝２２ａを設けてあるので、同
脚部２２の外周面は弾性部材１３の空隙１３ａの内周面
に対して面全体で接触することはなく溝２２ａの部分に
おいて非接触に保たれる。また、図４の矢印方向と反対
方向の外力が外筒１２に付与されて、ストッパ部材２０
の脚部２３の外周面と弾性部材１３の空隙１３ｂの内周
面とが当接した場合にも、これらの両面は溝２３ａの部
分において非接触に保たれる。On the other hand, in the state where the bush with the stopper member 20 assembled as described above is incorporated in the suspension device of the vehicle, an external force is applied to the outer cylinder 12 from a direction perpendicular to the axial direction as shown by the arrow in FIG. Then, the outer peripheral surface of the leg portion 22 of the stopper member 20 has a space 13 a in the elastic member 13.
Abuts the inner peripheral surface of. However, since a plurality of grooves 22a are provided on the outer peripheral surface of the leg portion 22 of the stopper member 20, the outer peripheral surface of the leg portion 22 contacts the inner peripheral surface of the void 13a of the elastic member 13 over the entire surface. The groove 22a is kept in a non-contact state. Further, an external force in the direction opposite to the arrow direction of FIG.
Even when the outer peripheral surface of the leg portion 23 and the inner peripheral surface of the gap 13b of the elastic member 13 come into contact with each other, these both surfaces are kept in non-contact with each other in the groove 23a.

【００１３】したがって、この状態で、ブッシュ本体１
０にこじり力が作用しても、脚部２２，２３の外周面と
弾性部材１３の空隙１３ａ，１３ｂの内周面との接触部
分にたまった空気、水、泥、氷、ほこりなどは溝２２
ａ，２３ａを介して外部に放出され、前記こじり力が作
用した状態でも異音を発生することがなくなる。また、
泥、ほこりなどが外部に放出される結果、前記接触面の
摩耗も少なくなり、ブッシュの耐久性も向上する。Therefore, in this state, the bush body 1
Even if a prying force is applied to 0, air, water, mud, ice, dust, etc. accumulated in the contact portion between the outer peripheral surfaces of the leg portions 22 and 23 and the inner peripheral surfaces of the voids 13a and 13b of the elastic member 13 will not be grooved. 22
It is released to the outside via a and 23a, and no abnormal noise is generated even when the twisting force acts. Also,
As a result of mud and dust being discharged to the outside, wear of the contact surface is reduced and durability of the bush is improved.

【００１４】なお、上記実施形態においては脚部２２，
２３の外周面側に溝２２ａ，２３ａを設けるようにした
が、図５に示すように、同外周面と対向する弾性部材１
３の空隙１３ａ，１３ｂの内周面上に周方向に沿った複
数の溝１３ａ１，１３ｂ１（ただし、溝１３ａ１のみを
図示）を設けるようにしてもよい。これによっても、溝
１３ａ１，１３ｂ１は上記実施形態の溝２２ａ，２３ａ
と同じ機能を発揮するので、上記実施形態と同様な効果
を奏する。In the above embodiment, the leg portions 22,
Although the grooves 22a and 23a are provided on the outer peripheral surface side of 23, as shown in FIG. 5, the elastic member 1 facing the outer peripheral surface is formed.
A plurality of grooves 13a1 and 13b1 (only the groove 13a1 is shown) may be provided along the circumferential direction on the inner peripheral surfaces of the three voids 13a and 13b. As a result, the grooves 13a1 and 13b1 are also formed in the grooves 22a and 23a of the above embodiment.
Since the same function as described above is exhibited, the same effect as that of the above-described embodiment is obtained.

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

【図１】 本発明の一実施形態に係るブッシュの縦断正
面図である。FIG. 1 is a vertical cross-sectional front view of a bush according to an embodiment of the present invention.

【図２】 同ブッシュの左側面図である。FIG. 2 is a left side view of the bush.

【図３】 図１のＡ部の拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a portion A of FIG.

【図４】 外筒に軸線方向と直角な外力が付与された状
態を示す同ブッシュの縦断正面図である。FIG. 4 is a vertical sectional front view of the bush showing a state in which an external force perpendicular to the axial direction is applied to the outer cylinder.

【図５】 本発明の他の実施形態に係るブッシュの前記
Ａ部に対応する部位の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a portion corresponding to the portion A of the bush according to another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１０…ブッシュ本体、１１…内筒、１２…外筒、１３…
弾性部材、１３ａ，１３ｂ…空隙、２０…ストッパ部
材、２１…環状部、２２，２３…脚部、２２ａ，２３ａ
…溝、１３ａ１，１３ｂ１…溝。10 ... Bush body, 11 ... Inner cylinder, 12 ... Outer cylinder, 13 ...
Elastic member, 13a, 13b ... Void, 20 ... Stopper member, 21 ... Annular portion, 22, 23 ... Leg portion, 22a, 23a
... grooves, 13a1, 13b1 ... grooves.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 草間 栄一 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiichi Kusama 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 同軸的に配置された内筒と外筒との間に
弾性部材を介装して固着してなるとともに同弾性部材に
軸線方向へ貫通した空隙を形成してなるブッシュ本体
と、前記ブッシュ本体に組み付けられて一部を前記空隙
に侵入させてなるストッパ部材とからなるブッシュにお
いて、前記弾性部材の空隙内周面又は同内周面に対向す
るストッパ部材の外周面に複数の溝を設けたことを特徴
とするブッシュ。1. A bushing main body comprising an inner cylinder and an outer cylinder which are coaxially arranged and fixed by interposing an elastic member between the inner cylinder and the outer cylinder, and forming a gap penetrating in the axial direction in the elastic member. A bush formed of a stopper member assembled to the bush body and partially penetrating into the gap, wherein a plurality of gaps are provided on the inner peripheral surface of the elastic member or on the outer peripheral surface of the stopper member facing the inner peripheral surface. Bush characterized by having a groove.