JP3446086B2 - Bush type anti-vibration rubber - Google Patents
Bush type anti-vibration rubberInfo
- Publication number
- JP3446086B2 JP3446086B2 JP14392393A JP14392393A JP3446086B2 JP 3446086 B2 JP3446086 B2 JP 3446086B2 JP 14392393 A JP14392393 A JP 14392393A JP 14392393 A JP14392393 A JP 14392393A JP 3446086 B2 JP3446086 B2 JP 3446086B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- engagement
- vibration
- cylindrical
- rigid outer
- 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.)
- Expired - Fee Related
Links
Landscapes
- Springs (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、ブッシュ形防振ゴムに
関する。特に、自動車におけるフロント・リアサスペン
ションメンバーのボディマウントクッション（防振マウ
ント）等に好適な発明である。
【０００２】ここでは、主として剛体外筒部が二分割タ
イプのボディマウントクッションを例に採り、説明する
がこれに限られるものではない。
【０００３】
【従来の技術】従来のボディマウントクッションとして
使用されるブッシュ形防振ゴムの一例を図１〜３に示
す。
【０００４】剛体内筒部１と剛体外筒部３との間が防振
ゴム部５で連結されてなり、剛体外筒部３が、一対の半
筒部３ａ、３ａに分割されてなり、筒状ホルダー９ヘ圧
入前に半筒部３ａ、３ａ相互が離隔しており、筒状ホル
ダー９ヘ圧入後に半筒部３ａ、３ａ相互が近接する構成
である。そして、剛体外筒部３は、先端側に筒状ホルダ
ー９の上端縁（係合受け部）９ａに係合する複数（図例
では４個）の係合爪部７が形成されているとともに、元
部側は筒状ホルダー９の下端部に係合するようにように
係合フランジ部８とされている。なお、剛体外筒部３の
先端側は、防振ゴムを筒状ホルダー９に挿入し易いよう
に絞り形状とされている。
【０００５】ここで、上記防振ゴムは、サスペンション
メンバー（サブフレーム）１１に一体的に形成された筒
状ホルダー９に下側から圧入させるとともに、防振ゴム
は車体１３から突出されたボルト１５を、防振ゴムの剛
体内筒部１に挿通させ、座金部１７を介してナット１９
をねじ込んでねじ止めして車体１３とサブフレーム１１
との間に介在させている。なお、図例中、２１は、スト
ッパゴムである。
【０００６】そして、上記防振ゴムは、自動車走行中に
おいてサブフレームに作用する上下動、縦揺れ等の振動
を減衰させて車体に伝える作用を奏する。
【０００７】このとき、バウンド時の防振ゴムが上方向
に抜けようとするが、それは、筒状ホルダー９の下端と
剛体外筒部３の係合フランジ部３ｂとの係合により阻止
される。また、リバウンド時において、防振ゴムが下方
向に抜けようとするが、それは、係合爪部７と筒状ホル
ダー９の上端縁（係合受け部）９ａとの係合により阻止
される。
【０００８】なお、上記に類似する公知技術として、実
公昭５７−１２６６４９号公報に記載されたものがあ
る。
【０００９】
【発明が解決しようとする課題】しかし、筒状ホルダー
９は、通常プレス加工で形成され、製作寸法公差が大き
いため、通常、係合爪部７を公差を見込んで高めの位置
に形成する（マイナス公差で筒状ホルダー９をプレス加
工している。）。
【００１０】このため、係合爪部７の係合面７ａと筒状
ホルダー９の上端縁９ａとの間に１mm前後のギャップＧ
が発生することがある。このギャップが存在により、外
筒部３外周と筒状ホルダー９との間に相対的なズリが発
生して、異音（きしみ音）が発生することが分かった。
【００１１】本発明は、上記にかんがみて、外筒部外周
の係合爪部の係合面と筒状ホルダーの係合受け部と間に
ギャップを解消することができ、外筒部と筒状ホルダー
との間に異音発生の原因となるズリが発生することのな
いブッシュ形防振ゴムを提供することを目的とする。
【００１２】
【課題を解決するための手段】本発明のブッシュ形防振
ゴムは、上記課題を下記構成により解決するものであ
る。
【００１３】剛体内筒部と、元部側に係合フランジ部を
備えた剛体外筒部との間が防振ゴム部で連結されてな
り、剛体外筒部が、先端側に筒状ホルダーの係合受け部
に係合する係合爪部が形成されてなる構成のブッシュ形
防振ゴムにおいて、剛体外筒部の外周壁に形成された係
合爪部の係合面側に複数の貫通孔が形成され、該貫通孔
を介して係合面が防振ゴム部から伸びるゴム層で被覆さ
れ、ゴム層は係合爪部の係合面と筒状ホルダーの係合受
け部との間に発生する最大ギャップと略同一厚さを有す
ることを特徴とする。
【００１４】
【発明の作用・効果】本発明のブッシュ形防振ゴムは、
上記のような構成により、下記のような作用・効果を奏
する。
【００１５】剛体外筒部１の外周壁に形成された係合爪
部７の係合面７ａがゴム層２５で被覆され、ゴム層２３
は係合爪部７の係合面７ａと筒状ホルダー９の係合受け
部９ａとの間に発生する最大ギャップと略同一厚さを有
する。このため、係合爪部７の係合面７ａと筒状ホルダ
ー９の上端縁９ａ等との間のギャップＧは、ゴム層２５
で埋められる。
【００１６】従って、自動車のリバウンド時、防振ゴム
が下方向に抜けようと力を受けても、従来の如く、剛体
外筒部と筒状ホルダーとの間に相対的に若干のズリ移動
が発生することがなく、異音（きしみ音）が発生するこ
ともない。
【００１７】
【実施例】以下、本発明を実施例に基づいて詳細に説明
をする。前述例と同一部分については、同一図符号を付
すと共に、それらの説明の全部または一部を省略する。
【００１８】前述例と同様、剛体内筒部１と、元部側
（一端側）に係合フランジ部３ｂを備えた剛体外筒部３
との間が防振ゴム部５で連結されてなり、剛体外筒部３
が、一対の半筒部３ａ、３ａに分割されてなり、筒状ホ
ルダー９ヘ圧入前に半筒部３ａ、３ａ相互が離隔してお
り、筒状ホルダー９ヘ圧入後に半筒部３ａ、３ａ相互が
近接する構成である。また、剛体外筒部３は、先端側に
筒状ホルダー９の係合受け部９ａに係合する係合爪部７
が形成されているとともに、元部側は筒状ホルダー９の
下端部に係合するようにように係合フランジ部８とされ
ている。
【００１９】ここで、半筒部３ａ、３ａの離隔距離ｄ
は、半筒部３ａ、３ａの外周半径ｒを２５mmとしたと
き、３〜５mmとする。また、図例では、剛体内筒部１は
鋼管で、、剛体外筒部３はガラス繊維強化ナイロンであ
るが、内筒部１及び外筒部３の成形材料は、所要の強度
を有すれば特に限定されず、鋼、アルミニウム等の金属
材料（鋳物を含む）、強化プラスチック、セラミックス
等任意である。また、防振ゴム部は、天然ゴム、エチレ
ンプロピレンゴム等で成形され、通常、上記剛体内筒部
１及び剛体外筒部３をインサートとして、射出・トラン
スファー等によりインサート成形をする。ここまでは、
従来例と実質的に変わらない。また、内筒部１及び外筒
部３の形状は、図例ではともに円筒であるが、外筒部３
の形状は、楕円状、角筒状であってもよい。
【００２０】上記構成において、本実施例では、図４〜
６に示す如く、剛体外筒部３の周壁の係合爪部７の係合
面７ａ側に複数の貫通孔２３が形成され、該貫通孔２３
を介して係合面が防振ゴム部から伸びるゴム層２５で被
覆されている。このとき、ゴム層２５は係合爪部７の係
合面７ａと筒状ホルダー９の係合受け部９ａとの間に発
生する最大ギャップと略同一厚（通常、１．０〜３mm）
を有する。
【００２１】なお、このゴム層の形成は、通常防振ゴム
部を成形時に形成するが、防振ゴムを筒状ホルダーに圧
入時の迫り出しを利用してもよい。
【００２２】なお、本発明は、図７に示す如く、本発明
を剛体外筒部３を分割体でない構成の防振ゴムにも適用
できることは勿論である。また、係合爪部７が連続状で
ある構成の防振ゴムにも適用できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing type rubber vibration insulator. In particular, the present invention is suitable for a body mount cushion (anti-vibration mount) of a front / rear suspension member in an automobile. Here, a description will be mainly given of a body mount cushion in which a rigid outer cylindrical portion is a two-part type, but the present invention is not limited to this. 2. Description of the Related Art FIGS. 1 to 3 show an example of a conventional bush-type anti-vibration rubber used as a body mount cushion. [0004] The rigid inner cylindrical portion 1 and the rigid outer cylindrical portion 3 are connected by an anti-vibration rubber portion 5, and the rigid outer cylindrical portion 3 is divided into a pair of half cylindrical portions 3a, 3a. The half cylinder portions 3a and 3a are separated from each other before press-fitting into the cylindrical holder 9, and the half cylinder portions 3a and 3a approach each other after press-fitting into the cylindrical holder 9. The rigid outer cylindrical portion 3 has a plurality of (four in the illustrated example) engaging claw portions 7 that are engaged with the upper end edge (engagement receiving portion) 9a of the cylindrical holder 9 on the distal end side. The base portion side is formed as an engaging flange portion 8 so as to engage with the lower end portion of the cylindrical holder 9. Note that the distal end side of the rigid outer cylindrical portion 3 has a drawn shape so that the vibration-proof rubber can be easily inserted into the cylindrical holder 9. Here, the vibration-proof rubber is pressed into a cylindrical holder 9 formed integrally with the suspension member (sub-frame) 11 from below, and the rubber vibration-proof rubber is bolted to a bolt 15 protruding from the vehicle body 13. Is inserted through the rigid cylindrical portion 1 made of the vibration isolating rubber, and the nut 19 is inserted through the washer 17.
Into the body 13 and the sub-frame 11
And between them. In the illustrated example, reference numeral 21 denotes a stopper rubber. The anti-vibration rubber has an effect of attenuating vibrations such as vertical movement and vertical swing acting on the sub-frame during traveling of the vehicle and transmitting the vibrations to the vehicle body. At this time, the vibration isolating rubber at the time of bounce tends to come off upward, but this is prevented by the engagement between the lower end of the cylindrical holder 9 and the engaging flange 3b of the rigid outer cylindrical portion 3. . Also, at the time of rebound, the vibration isolating rubber tends to fall downward, but this is prevented by the engagement between the engaging claw portion 7 and the upper end edge (engagement receiving portion) 9 a of the cylindrical holder 9. As a known technique similar to the above, there is one disclosed in Japanese Utility Model Publication No. 57-126649. However, since the cylindrical holder 9 is usually formed by press working and has a large manufacturing dimensional tolerance, the engaging claw 7 is usually set at a higher position in consideration of the tolerance. (The cylindrical holder 9 is pressed with a minus tolerance.) Therefore, a gap G of about 1 mm is provided between the engaging surface 7a of the engaging claw 7 and the upper edge 9a of the cylindrical holder 9.
May occur. It was found that due to the presence of this gap, relative misalignment was generated between the outer periphery of the outer cylinder portion 3 and the cylindrical holder 9, and abnormal noise (squeaking noise) was generated. In view of the above, the present invention can eliminate the gap between the engaging surface of the engaging claw on the outer peripheral portion of the outer cylinder and the engagement receiving portion of the cylindrical holder. It is an object of the present invention to provide a bush-type vibration-proof rubber that does not generate a slip that causes abnormal noise between the holder and the holder. [0012] The bush-type anti-vibration rubber of the present invention solves the above problems by the following constitution. A rigid body cylindrical portion and a rigid outer cylindrical portion having an engagement flange portion on the base side are connected by an anti-vibration rubber portion, and the rigid outer cylindrical portion has a cylindrical holder on the distal end side. In the bush-type anti-vibration rubber having a configuration in which an engagement claw portion that engages with the engagement receiving portion is formed, a plurality of engagement claw portions formed on an outer peripheral wall of the rigid outer cylinder portion are provided on an engagement surface side. A through hole is formed, and the engaging surface is covered with a rubber layer extending from the vibration isolating rubber portion through the through hole, and the rubber layer is formed between the engaging surface of the engaging claw portion and the engaging receiving portion of the cylindrical holder. It is characterized in that it has substantially the same thickness as the maximum gap generated therebetween. Operation / Effects of the Invention The bush type vibration isolating rubber of the present invention
With the configuration as described above, the following operations and effects can be obtained. The engaging surface 7a of the engaging claw 7 formed on the outer peripheral wall of the rigid outer cylindrical portion 1 is covered with a rubber layer 25,
Has substantially the same thickness as the maximum gap generated between the engagement surface 7a of the engagement claw 7 and the engagement receiving portion 9a of the cylindrical holder 9. For this reason, the gap G between the engagement surface 7a of the engagement claw portion 7 and the upper edge 9a of the cylindrical holder 9 and the like is formed by the rubber layer 25.
Filled with. Therefore, even when the anti-vibration rubber is subjected to a downward force when the vehicle rebounds, there is a slight relative displacement between the rigid outer cylindrical portion and the cylindrical holder as in the prior art. No noise is generated, and no abnormal noise (squeaking noise) is generated. Hereinafter, the present invention will be described in detail with reference to examples. The same parts as those in the above-described example are denoted by the same reference numerals, and all or part of the description thereof is omitted. As in the above-described embodiment, the rigid cylindrical portion 1 and the rigid outer cylindrical portion 3 having an engagement flange 3b on the base side (one end side).
Are connected by an anti-vibration rubber portion 5 to form a rigid outer cylinder portion 3.
Is divided into a pair of half-cylinder portions 3a, 3a, and the half-cylinder portions 3a, 3a are separated from each other before press-fitting into the cylindrical holder 9; The configuration is such that they are close to each other. Further, the rigid outer cylindrical portion 3 has an engaging claw portion 7 that is engaged with an engagement receiving portion 9a of the cylindrical holder 9 on the distal end side.
Are formed, and an engagement flange portion 8 is formed on the base portion side so as to engage with a lower end portion of the cylindrical holder 9. Here, the separation distance d between the half cylinder portions 3a, 3a
Is 3 to 5 mm when the outer peripheral radius r of the half cylinder portions 3 a and 3 a is 25 mm. Further, in the illustrated example, the rigid cylindrical portion 1 is a steel pipe, and the rigid outer cylindrical portion 3 is a glass fiber reinforced nylon, but the molding material of the inner cylindrical portion 1 and the outer cylindrical portion 3 may have a required strength. The material is not particularly limited, and may be any metal material (including casting) such as steel and aluminum, reinforced plastic, ceramics, and the like. The vibration-proof rubber portion is formed of natural rubber, ethylene propylene rubber, or the like, and is usually formed by insert molding by injection, transfer, or the like using the above-mentioned rigid inner cylinder portion 1 and rigid outer cylinder portion 3 as inserts. So far,
It is not substantially different from the conventional example. In addition, the shape of the inner cylinder part 1 and the outer cylinder part 3 is both cylindrical in the illustrated example, but the outer cylinder part 3
May be elliptical or square tubular. In the above embodiment, in this embodiment, FIGS.
As shown in FIG. 6, a plurality of through holes 23 are formed in the peripheral surface of the rigid outer cylindrical portion 3 on the side of the engaging surface 7 a of the engaging claw portion 7.
The engaging surface is covered with a rubber layer 25 extending from the vibration-proof rubber portion through the contact hole. At this time, the rubber layer 25 has substantially the same thickness (normally 1.0 to 3 mm) as the maximum gap generated between the engagement surface 7a of the engagement claw portion 7 and the engagement receiving portion 9a of the cylindrical holder 9.
Having. The rubber layer is usually formed at the time of molding the vibration-proof rubber portion, but it is also possible to utilize the vibration-proof rubber portion when it is pressed into the cylindrical holder. As shown in FIG. 7, the present invention can of course be applied to an anti-vibration rubber having a structure in which the rigid outer cylindrical portion 3 is not divided. Further, the present invention can be applied to a vibration-proof rubber having a configuration in which the engagement claw portion 7 is continuous.
【図面の簡単な説明】
【図１】従来例のブッシュ形防振ゴムの一例を示す斜視
図
【図２】図１の防振ゴムをホルダーに圧入した状態を示
す縦断面図
【図３】図２のIII 部拡大断面図
【図４】実施例の防振ゴムのホルダー圧入前の状態を示
す縦断面図
【図５】図４の平面図
【図６】図４のVI部拡大断面図
【図７】剛体外筒部を分割体でない構成の防振ゴムにも
適用した例を示す平面図
【符号の説明】
１ 剛体内筒部
３ 剛体外筒部
５ 防振ゴム部
７ 係合爪部
７ａ 係合面
８ 係合フランジ部
９ 筒状ホルダー
９ａ 筒状ホルダーの上端縁（係合受け部）
２３ ゴム層形成用貫通孔
２５ ゴム層BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a conventional bush-type anti-vibration rubber. FIG. 2 is a longitudinal sectional view showing a state in which the anti-vibration rubber of FIG. 1 is pressed into a holder. FIG. 4 is an enlarged sectional view of a part III in FIG. 2; FIG. 4 is a longitudinal sectional view showing a state before press-fitting a vibration-proof rubber of the embodiment into a holder; FIG. 5 is a plan view of FIG. 4; FIG. FIG. 7 is a plan view showing an example in which the rigid outer cylinder is applied to a vibration isolating rubber having a configuration that is not a divided body. [Description of References] 1 Rigid inner cylinder 3 Rigid outer cylinder 5 Vibration isolating rubber 7 Engagement claw Part 7a Engagement surface 8 Engagement flange part 9 Cylindrical holder 9a Upper edge (engagement receiving part) of cylindrical holder 23 Through hole 25 for forming rubber layer Rubber layer
Claims (1)
を備えた剛体外筒部との間が防振ゴム部で連結されてな
り、前記剛体外筒部が、先端側に筒状ホルダーの係合受
け部に係合する係合爪部が形成されてなる構成のブッシ
ュ形防振ゴムにおいて、 前記剛体外筒部の周壁の係合爪部の係合面側に複数の貫
通孔が形成され、該貫通孔を介して前記係合面が前記防
振ゴム部から伸びるゴム層で被覆され、該ゴム層は前記
係合爪部の係合面と筒状ホルダーの係合受け部との間に
発生する最大ギャップと略同一厚さを有することを特徴
とするブッシュ形防振ゴム。(57) [Claim 1] A rigid body cylindrical portion and a rigid outer cylindrical portion having an engagement flange portion on the base portion side are connected by a vibration-proof rubber portion, A bush-type anti-vibration rubber having a structure in which a rigid outer cylinder portion is formed on an end side with an engagement claw engaging with an engagement receiving portion of a cylindrical holder, wherein an engagement claw on a peripheral wall of the rigid outer cylinder portion is provided. A plurality of through holes are formed on the engagement surface side of the portion, and the engagement surface is covered with a rubber layer extending from the vibration isolating rubber portion via the through hole, and the rubber layer is engaged with the engagement claw portion. A bush-type anti-vibration rubber having substantially the same thickness as a maximum gap generated between a mating surface and an engagement receiving portion of a cylindrical holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14392393A JP3446086B2 (en) | 1993-06-15 | 1993-06-15 | Bush type anti-vibration rubber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14392393A JP3446086B2 (en) | 1993-06-15 | 1993-06-15 | Bush type anti-vibration rubber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH074458A JPH074458A (en) | 1995-01-10 |
| JP3446086B2 true JP3446086B2 (en) | 2003-09-16 |
Family
ID=15350247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14392393A Expired - Fee Related JP3446086B2 (en) | 1993-06-15 | 1993-06-15 | Bush type anti-vibration rubber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3446086B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4901201B2 (en) | 2005-12-08 | 2012-03-21 | 興和株式会社 | Fundus image processing method and apparatus |
| KR101134972B1 (en) * | 2009-11-19 | 2012-04-09 | 기아자동차주식회사 | Bush and engine that is equipped with the bush |
| JP7121651B2 (en) * | 2018-12-20 | 2022-08-18 | 住友理工株式会社 | Anti-vibration structure |
-
1993
- 1993-06-15 JP JP14392393A patent/JP3446086B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH074458A (en) | 1995-01-10 |
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