JP2004308865A

JP2004308865A - Vibration control device and manufacturing method thereof

Info

Publication number: JP2004308865A
Application number: JP2003106213A
Authority: JP
Inventors: Yuuzou Hatsutori; 優三服部
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2003-04-10
Filing date: 2003-04-10
Publication date: 2004-11-04

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the manufacturing work, and to easily assemble a vibration control device with a few kinds of devices. <P>SOLUTION: In a rubber bush 10, a reducing diameter part 26, to which a rubber main body part 22 of an elastic body 24 is fixed, is provided in one axial end of an outer cylinder 22, and the reducing diameter part 26 is formed with two slits extended in the axial direction and opened toward one end surface of the outer cylinder 22 in one end thereof. In the condition that a bush main body part 18 is pressed into the collar 16 for fixation, the reducing diameter part 26 of the outer cylinder 22 is pressurized toward the inner peripheral side by a compressing part 42 of the collar 16 to narrow the opening width of the slits to reduce the diameter of the reducing diameter part 26. With this structure, the rubber main body part 32 of the elastic body 24 fixed to the reducing diameter part 26 and an inner cylinder 20 is previously compressed along the radial direction to eliminate the tensile stress left in the rubber main body part 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車におけるサスペンションリンクと車体との間の振動遮断等に用いられるブッシュタイプの防振装置及びその製造方法に関する。
【０００２】
【従来の技術】
自動車のサスペンションを構成する各種のロアアーム、アッパーアーム等のリンク部品には、その取付軸の部分に防振装置としてゴムブッシュが配置されており、このゴムブッシュを介して車体側の支軸等に弾性的に連結されるものがある。これにより、自動車の走行時に路面側からリンク部品に振動が入力しても、ゴムブッシュに配置されたゴム製の弾性体より入力振動が吸収されて車体へ伝達される振動が減衰及び吸収される。このゴムブッシュとしては、例えば、内筒と、この内筒の外周側に配置される外筒と、内筒の外周面と外筒の内周面とにそれぞれ加硫接着されての内筒と外筒とを弾性的に連結するゴム製の弾性体と、円筒状のカラーとを備えたものがある。ここで、カラーはリンク部品の取付軸を構成しており、このカラー内に外筒が圧入固定されることにより、弾性体により連結された内筒及び外筒からなるゴムブッシュの本体部がリンク部品に組み付けられる。
【０００３】
上記のような従来のゴムブッシュの製造方法を簡単に説明すると、先ず、予め加硫接着処理した内筒及び外筒をインサートコアとして加硫成形用のモールド内にセットし、このモールド内に溶融状態の加硫ゴムを注入することにより、内筒と外筒との間に弾性体を成形すると同時に、この弾性体を内筒及び外筒に加硫接着する。次いで、弾性体により内筒と連結された外筒をカラー内に圧入固定することにより、弾性体により連結された内筒及び外筒からなるゴムブッシュの本体部をリンク部品側に配置されたカラーに組み付ける。
【０００４】
ところで、弾性体の成形過程においては、弾性体は溶融状態からの凝固時に収縮（加硫収縮）することから、加硫成形したままの弾性体には内筒と外筒との間で径方向に沿った引張り応力が残留じている。このような引張り応力は弾性体自体の寿命を低下させたり、内筒又は外筒からの弾性体の早期剥離の原因になり得ることから、ゴムブッシュがリンク部品に組み付けられた状態では、弾性体から引張り応力を除去しておく必要がある。このため、従来のゴムブッシュの組立時には、ゴムブッシュの本体部が圧入固定されたカラーを外周側から加圧することよりカラーと共に外筒を内周側へ絞り加工して、弾性体を内周側へ予圧縮（プリコンプレッション）している。
【０００５】
また、カラーを直接しぼり加工できない場合や、カラーへの圧入前に外筒を絞り加工したい場合には、例えば、特許文献１に示されているブッシュ装置のように、周方向に沿って複数の分割片に分割された外筒の外周側に環状の拘束部材を嵌挿し、この拘束部材により分割片の移動を拘束しつつ弾性体をプリコンプレッションした後に、ブッシュ装置をカラー内へ圧入固定している。
【０００６】
【特許文献１】
特開２０００−８９６０１号公報
【０００７】
【発明が解決しようとする課題】
しかしながら、上記のような従来のゴムブッシュを組み立てる際には、弾性体により内筒に連結された外筒をカラー内へ圧入する作業と、外筒が嵌挿されたカラー又は絞り部材を内周側へ絞り加工する作業とがそれぞれ必要となり、これらの作業を行うプレス装置等も圧入固定を行うための装置と、しぼり加工を行うための装置とがそれぞれ必要となる。このため、従来のゴムブッシュには、構造自体が単純であるにもかかわらず、製造作業が煩瑣であり、さらに製造のために多種類の組立・加工装置が必要であることから、製造コストの低減が困難であるという問題がある。
【０００８】
また、特許文献１に示されたブッシュ装置の場合にも、複数の分割片からなる外筒の外周側に拘束部材を嵌挿する作業と、ブッシュ装置をカラー内へ圧入固定する作業をそれぞれ異なる装置により行う必要があるため、その組立のためには多種類の組立・加工装置が必要となる。
【０００９】
本発明の目的は、上記事実を考慮して、製造作業を簡略化できると共に、少ない種類の装置により簡単に組み立てることができる防振装置及びその製造方法を提供することにある。
【００１０】
【課題を解決するための手段】
本発明に係る防振装置は、振動発生部及び振動受部の一方に連結される内筒と、前記内筒の外周側に配置され、振動発生部及び振動受部の他方に連結される外筒と、前記内筒の外周面と前記外筒の内周面とにそれぞれ固着されて、前記内筒と前記外筒とを弾性的に連結する弾性体と、前記外筒が圧入固定される筒状のカラー部材とを有する防振装置であって、前記外筒の軸方向における一端側に前記弾性体が固着される縮径部を設けると共に、該縮径部に前記軸方向へ延在し一端部が前記外筒の一端面へ開口するスリットを形成し、前記外筒を前記カラー部材内に圧入した状態で、該カラー部材により前記縮径部を内周側へ加圧し、前記スリットの開口幅を周方向に沿って縮小しつつ該縮径部を縮径させることを特徴とする。
【００１１】
上記本発明に係る防振装置によれば、外筒の軸方向における一端側に弾性体が固着される縮径部を設けると共に、この縮径部に軸方向へ延在し一端部が外筒の一端面へ開口するスリットを形成し、外筒をカラー部材内に圧入固定した状態で、このカラー部材により縮径部を内周側へ加圧し、スリットの開口幅を周方向に沿って狭めつつ縮径部を縮径させることにより、弾性体を介して内筒に連結された外筒をカラー部材に圧入すると共に、縮径部に形成されたスリットの開口幅を周方向に沿って狭めつつ縮径部を縮径できるので、この縮径部の内周面と内筒の外周面とにそれぞれ固着された弾性体を径方向に沿って予圧縮（プリコンプレッション）し、弾性体に残留していた引張り応力を消失できる。従って、従来のブッシュタイプの防振装置と比較し、弾性体を介して内筒に連結された外筒をカラー部材内に圧入した後にカラー部材を絞り加工したり、弾性体を介して内筒に連結された外筒をカラー部材に圧入する前に、複数の分割片からなる外筒の外周側に拘束部材を嵌挿する必要がなくなるので、組立作業が簡単になると共に、組立に必要となる装置の種類も減少できる。
【００１２】
また本発明に係る防振装置の製造方法は、請求項１、２、３又は４記載の防振装置の製造方法であって、前記弾性体を介して前記内筒が連結された前記外筒を前記カラー部材内に圧入しつつ、該カラー部材により前記縮径部を内周側へ加圧し、前記スリットの開口幅を周方向に沿って縮小すると同時に該縮径部を縮径させる圧入工程を含むことを特徴とする。
【００１３】
上記本発明に係る防振装置の製造方法によれば、弾性体を介して内筒が連結された外筒をカラー部材内に圧入しつつ、このカラー部材により縮径部を内周側へ加圧し、スリットの開口幅を周方向に沿って狭めると同時に縮径部を縮径させることにより、弾性体を介して内筒に連結された外筒をカラー部材に圧入すると同時に、縮径部に形成されたスリットの開口幅を周方向に沿って狭めつつ縮径部を縮径できるので、この縮径部の内周面と内筒の外周面とにそれぞれ固着された弾性体を径方向に沿って予圧縮（プリコンプレッション）し、弾性体に残留していた引張り応力を消失できる。従って、従来のブッシュタイプ防振装置の製造方法と比較し、弾性体を介して内筒に連結された外筒をカラー部材内に圧入した後にカラー部材を絞り加工する工程又は、弾性体を介して内筒に連結された外筒をカラー部材に圧入する前に、複数の分割片からなる外筒の外周側に拘束部材を嵌挿する工程を不要にできるので、組立作業が簡単になると共に、組立に必要となる装置の種類も減少できる。
【００１４】
【発明の実施の形態】
以下、本発明の実施形態に係るゴムブッシュ及びその製造方法について図面を参照して説明する。
【００１５】
（ゴムブッシュの構成）
図１には本発明の実施形態に係る防振装置であるゴムブッシュが示されている。ゴムブッシュ１０は、図４に示されるロッド状のロアアーム１２の一部を構成するものであり、このロアアーム１２は自動車等の車両におけるサスペンションを構成するリンク部品として適用される。
【００１６】
ロアアーム１２には、図４に示されるように、中空パイプ状のロッド部１４が設けられ、このロッド部１４の両端部には、それぞれ溶接等に円筒状のカラー１６が固定されている。カラー１６の内部には、全体として肉厚略円筒状に形成されたゴムブッシュ１０のブッシュ本体部１８が圧入固定されており、このブッシュ本体部１８及びカラー１６によりゴムブッシュ１０は構成されている。またブッシュ本体部１８は、図１に示されるように、内筒２０、この内筒２０の外周側に配置される外筒２２及び、内筒２０の外周面と外筒２２の内周面とにそれぞれ加硫接着されて内筒２０と外筒２２とを弾性的に連結したゴム製の弾性体２４を備えている。なお、内筒２０の軸心Ｓに沿った方向をゴムブッシュ１０の軸方向とし、また軸方向に直交する方向をゴムブッシュ１０の径方向として以下の説明を行う。
【００１７】
図２に示されるように、内筒２０及び外筒２２は、それぞれ略円筒状に形成され略同軸的に配置されている。ここで、外筒２２には、軸方向に沿って一端側（図２（Ａ）では下側）に縮径部２６が設けられると共に、他端側に縮径部２６よりも大径とされた圧入部２８が同軸的に設けられている。また外筒２２は、軸方向に沿って縮径部２６と圧入部２８との間が一端側から他端側へ向ってテーパ状に外径が拡大する当接部３０とされ、この当接部３０を介して縮径部２６と圧入部２８とが連結されている。
【００１８】
図１に示されるように、弾性体２４には、肉厚円筒状のゴム本体部３２と、このゴム本体部３２の内周側から軸方向外側へ延出して内筒２０の外周面を被覆する薄肉状の被覆部３４とが一体的に成形（加硫成形）されている。ゴム本体部３２は、軸方向に沿って内筒２０の外周面における一端側と外筒２２の縮径部２６との間に配置されており、内筒２０の外周面と縮径部２６の内周面とにそれぞれ加硫接着されている。これにより、内筒２０と外筒２２とはゴム本体部３２により弾性的に連結される。またゴム本体部３２は、その軸方向に沿った断面形状が内周側から外周側へ向って幅が徐々に狭くなるような略台形状に形成されている。
【００１９】
図２に示されるように、外筒２２の縮径部２６には、軸方向に延在するように細長いスリット３６が形成されている。このスリット３６は縮径部２６を径方向に沿って貫通するように形成され、その一端部が縮径部２６の一端面へ開口している。またスリット３６には、応力集中を緩和するため他端部に半円状に加工された面取部３８が形成されており、スリット３６の他端部を起点とするクラック等の発生を防止している。ここで、スリット３６は、図２（Ｂ）に示されるように、周方向に沿って互いに等間隔（１８０°間隔）となるように縮径部２６に２本形成されている。またスリット３６は、面取部３８を除く部分で周方向に沿った初期の開口幅Ｗが一定とされており、この開口幅Ｗは、縮径部２６に２本のスリット３６が形成される場合には、例えば、縮径部２６の外周長に対して１％〜１０％程度の長さに設定される。また弾性体２４におけるゴム本体部３２の外周面には、外筒２２のスリット３６に面してスリット３６と略同一の幅及び長さを有する溝部４０が形成されている。
【００２０】
一方、ロッド部１４に固定されたカラー１６は、図１に示されるように、外筒２２よりも肉厚の略円筒状に形成されている。カラー１６には、軸方向に沿って一端側（図２（Ａ）では下側）に圧縮部４２が設けられると共に、他端側に圧縮部４２よりも大径とされた被圧入部４４が同軸的に設けられている。またカラー１６は、軸方向に沿って圧縮部４２と被圧入部４４との間が一端側から他端側へ向ってテーパ状に外径が拡大する被当接部４６とされ、この被当接部４６を介して圧縮部４２と被圧入部４４とが連結されている。
【００２１】
ここで、カラー１６における圧縮部４２の内径及び被圧入部４４の内径は、外筒２２における縮径部２６の外径及び圧入部２８の外径よりも、それぞれ所定長だけ小径とされている。具体的には、カラー１６の圧縮部４２は、縮径部２６の外径に対する締りばめの内径よりも小さな内径を有しており、またカラー１６の圧縮部４２は、圧入部２８の外径に対する締りばめの内径を有している。ここで、圧縮部４２の内径は、締りばめの内径に対してスリット３６の開口幅Ｗに対応する長さだけ小径に設定される。また被当接部４６は、図１に示されるように当接部３０よりも傾斜が強いテーパ状に形成されている。
【００２２】
弾性体２４により連結された内筒２０及び外筒２２により構成されたブッシュ本体部１８は、図１に示されるようにカラー１６内における所定の固定位置に圧入されることによりカラー１６に固定され、このカラー１６と共にゴムブッシュ１０を構成する。ゴムブッシュ１０では、外筒２２がカラー１６内の固定位置に圧入されることにより、外筒２２の縮径部２６がカラー１６の圧縮部４２の内周側に嵌挿されると共に、外筒２２の圧入部２８がカラー１６の被圧入部４４の内周側に嵌挿され、また外筒２２の当接部３０がカラー１６の被当接部４６に当接する。
【００２３】
ブッシュ本体部１８がカラー１６内の固定位置まで圧入されると、圧縮部４２は、外筒２２の縮径部２６を内周側へ加圧することにより、縮径部２６における２本のスリット３６の開口幅をそれぞれ均等量ずつ狭めつつ、この狭くなった量に略対応する長さだけ縮径部２６の内径を縮径させる。
【００２４】
このとき、圧縮部４２により圧入後のスリット３６の開口幅は、溝の略全長に亘って実質的に０になることが最も好ましいが、初期の開口幅Ｗ（図２参照）の１％以下になるまで狭めれば十分である。すなわち、ゴムブッシュ１０では、縮径部２６に形成されるスリット３６の本数及び初期の開口幅Ｗをそれぞれ適宜調整することにより、カラー１６内へ圧入された縮径部２６の縮径量の大小が調整可能になる。また弾性体２４のゴム本体部３２には、スリット３６に面して溝部４０が形成されていることから、スリット３６内に弾性体２４の一部が挟み込まれることが防止されている。
【００２５】
また、ブッシュ本体部１８がカラー１６内の固定位置まで圧入されると、カラー１６の被圧入部４４の内周面と外筒２２の圧入部２８の外周面とが径方向に沿って互いに及ぼし合う復元力により圧接し、この圧接力に応じて摩擦力が被圧入部４４と圧入部２８との間に生じる。このとき、外筒２２の圧入部２８は、スリット３６が形成された縮径部２６と比較して径方向に沿って十分に大きな剛性を有している。このため、被圧入部４４と圧入部２８との間に生じる摩擦力も十分に大きなものになり、この摩擦力により外筒２２はカラー１６に対して確実に拘束された状態となり、ブッシュ本体部１８のカラー１６からの脱落、カラー１６に対する移動が防止される。
【００２６】
むろん、カラー１６の圧縮部４２と外筒２２の縮径部２６との間にも摩擦力が生じるが、外筒２２における縮径部２６の径方向に沿った剛性が圧入部２８の剛性よりも大幅に小さいことから、圧縮部４２と外筒２２の縮径部２６との間に生じる摩擦力は、被圧入部４４と圧入部２８との間に生じる摩擦力よりもかなり小さいものになる。
【００２７】
さらにブッシュ本体部１８がカラー１６内の固定位置まで圧入されると、カラー１６の被当接部４６が外筒２２の当接部３０に突き当たり、外筒２２の移動を制限することにより、カラー１６内に圧入されたブッシュ本体部１８が固定位置（図１参照）に精度良く位置決めされる。
【００２８】
（ゴムブッシュの製造方法）
次に、上記のように構成されたゴムブッシュ１０の製造方法について説明する。ゴムブッシュ１０の製造時には、先ず、予め加硫接着処理が行われた内筒２０及び外筒２２がインサートコアとして加硫成形用のモールド（図示省略）内へセットされ、このモールド内に溶融状態の加硫ゴムが注入される。この後、加硫反応の進行により加硫ゴムが硬化して内筒２０と外筒２２の縮径部２６との間に弾性体２４が成形されると共に、内筒２０の外周面と縮径部２６の内周面とにそれぞれ弾性体２４が加硫接着される。このようにして、図２に示されるブッシュ本体部１８が製造されると、このブッシュ本体部１８をカラー１６内へ圧入する圧入作業が行われる。
【００２９】
ブッシュ本体部１８のカラー１６内への圧入は、図３に示されるような圧入装置６０を用いて行われる。圧入装置６０には、上下方向に沿って互いに対向するように配置された受け台６２及び圧入治具６４とが設けられている。ここで、圧入治具６４は、図示しないガイド機構により上下方向に沿って昇降可能に支持されている。また受け台６２の上面及び圧入治具６４の下面はそれぞれ水平方向に延在する平面状とされており、受け台６２の上面中心部には、内筒２０の外径よりも大きな内径を有する丸穴状の下側逃げ部６６が形成され、圧入治具６４の下面中心部にも下側逃げ部６６と略同一内径を有する丸穴状の上側逃げ部６８が同軸的に形成されている。
【００３０】
また圧入装置６０には、圧入治具６４の上面側に連結された複数本の加圧ロッド７０が設けられている。この加圧ロッド７０は油圧シリンダ（図示省略）に連結されており、この油圧シリンダは加圧ロッド７０を介して圧入治具６４を昇降させると共に、加圧ロッド７０及び圧入治具６４を介してブッシュ本体部１８の外筒２２に加圧力を作用させる。
【００３１】
ブッシュ本体部１８をカラー１６内へ圧入する際には、先ず、受け台６２上に被圧入部４４を上方へ向けた状態でカラー１６が載置される。このとき、カラー１６は、その軸心が下側逃げ部６６の中心と略一致するように受け台６２上で位置調整される。次いで、受け台６２上に載置されたカラー１６の被圧入部４４内にはブッシュ本体部１８における外筒２２の縮径部２６が挿入される。この状態で、図３に示されるように、縮径部２６は、上下方向に沿ってその下端がカラー１６の被当接部４６に突き当たる位置に仮り止めされ、またブッシュ本体部１８は、その軸心がカラー１６の軸心と略一致するようにカラー１６により保持される。
【００３２】
この後、受け台６２から十分に上方へ離間した待機位置に待機していた圧入治具６４をブッシュ本体部１８の外筒２２の上端面へ当接させ、油圧シリンダからの圧力を加圧ロッド７０及び圧入治具６４を介して外筒２２へ作用させる。この油圧シリンダからの加圧力により外筒２２の縮径部２６がカラー１６の圧縮部４２内へ圧入されると同時に、外筒２２の圧入部２８がカラー１６の被圧入部４４内へ圧入されて行く。このとき、外筒２２の縮径部２６がカラー１６の圧縮部４２内へ圧入されると同時に、縮径部２６の圧縮部４２内に挿入された部分が圧縮部４２により縮径部２６が内周側に加圧されることにより、縮径部２６に形成された２本のスリット３６の開口幅が略均等に狭められて縮径部２６が所定量だけ縮径される。これにより、縮径部２６と内筒２０との間に配置された弾性体２４のゴム本体部３２が径方向に沿って予圧縮（プリコンプレッション）される。
【００３３】
圧入装置６０では、ブッシュ本体部１８のカラー１６の圧入時に、外筒２２の当接部３０がカラー１６の被当接部４６に当接して外筒２２の圧入抵抗が増加すると、パワーリミッタが作動して油圧シリンダが自動停止する。これにより、ブッシュ本体部１８がカラー１６内の固定位置（図１参照）まで圧入され、ゴムブッシュ１０の製造が完了する。このとき、外筒２２の縮径部２６全体がカラー１６の圧縮部４２内に圧入され、かつ外筒２２の圧入部２８全体もカラー１６の被圧入部４４内に圧入された状態となる。
【００３４】
以上説明した本発明の実施形態に係るゴムブッシュ１０によれば、外筒２２の軸方向における一端側に弾性体２４のゴム本体部３２が固着される縮径部２６を設けると共に、この縮径部２６に軸方向へ延在し一端部が外筒２２の一端面へ開口する２本のスリット３６を形成し、ブッシュ本体部１８の外筒２２をカラー１６内に圧入固定した状態で、このカラー１６の圧縮部４２により縮径部２６を内周側へ加圧し、スリット３６の開口幅を狭めつつ縮径部２６を縮径させることにより、ゴム本体部３２を介して内筒２０に連結された外筒２２をカラー１６に圧入すると共に、縮径部２６に形成された２本のスリット３６の開口幅をそれぞれ均等に狭めつつ縮径部２６を縮径できるので、この縮径部２６と内筒２０とにそれぞれ固着された弾性体２４のゴム本体部３２を径方向に沿って予圧縮（プリコンプレッション）し、ゴム本体部３２に残留していた引張り応力を消失できる。
【００３５】
従って、従来のゴムブッシュと比較し、本実施形態に係るゴムブッシュ１０によれば、弾性体を介して内筒に連結された外筒をカラー内に圧入した後にカラーをプレス装置等により絞り加工したり、弾性体を介して内筒に連結された外筒をカラーに圧入する前に、複数の分割片からなる外筒の外周側に拘束部材を嵌挿する必要がなくなるので、組立作業が大幅に簡単になると共に、組立に必要となる装置の種類も減少できる。
【００３６】
また本発明の実施形態に係るゴムブッシュの製造方法によれば、ブッシュ本体部１８をカラー１６内に圧入しつつ、このカラー１６の圧縮部４２により縮径部２６を内周側へ加圧し、スリット３６の開口幅を狭めると同時に縮径部２６を縮径させることにより、ブッシュ本体部１８をカラー１６に圧入すると同時に、縮径部２６に形成された２本のスリット３６の開口幅をそれぞれ均等に狭めつつ縮径部２６を縮径できるので、この縮径部２６と内筒２０との間に配置されたゴム本体部３２を径方向に沿って予圧縮（プリコンプレッション）し、ゴム本体部３２に残留していた引張り応力を消失できる。
【００３７】
従って、従来のブッシュタイプ防振装置の製造方法と比較し、弾性体を介して内筒に連結された外筒をカラー部材内に圧入した後にカラーを絞り加工する工程又は、弾性体を介して内筒に連結された外筒をカラー部材に圧入する前に、複数の分割片からなる外筒の外周側に拘束部材を嵌挿する工程を不要にできるので、組立作業が簡単になると共に、組立に必要となる装置の種類も減少できる。
【００３８】
なお、本実施形態では、ゴムブッシュ１０を自動車のロアアーム１２に適用した場合のみを説明したが、無論、ゴムブッシュ１０をサスペンションにおける他のリンク部品や、サスペンション以外の各種のリンク部品に適用可能であることは言うまでもない。
【００３９】
【発明の効果】
以上説明したように本発明によればゴムブッシュ及びその製造方法によれば、製造作業を簡略化できると共に、少ない種類の装置により簡単に組み立てることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るゴムブッシュの構成を示す軸方向に沿った断面図である。
【図２】図１に示されるゴムブッシュにおけるブッシュ本体を示す側面図及び平面図である。
【図３】本発明の実施形態に係るゴムブッシュの製造に用いられる圧入装置及び、この圧入装置に装着されたカラー及びブッシュ本体部を示す側面断面図である。
【図４】本発明の実施形態に係るゴムブッシュが適用されたロアーアームを示す斜視図である。
【符号の説明】
１０ゴムブッシュ（防振装置）
１６カラー（カラー部材）
１８ブッシュ本体部
２０内筒
２２外筒
２４弾性体
２６縮径部
２８圧入部
３０当接部
３２ゴム本体部（弾性体）
３６スリット
４２圧縮部
４４被圧入部
４６被当接部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bush type vibration damping device used for isolating vibration between a suspension link and a vehicle body in an automobile, and a method of manufacturing the same.
[0002]
[Prior art]
Various types of link parts such as a lower arm and an upper arm that constitute a suspension of an automobile are provided with a rubber bush as an anti-vibration device on a mounting shaft portion thereof. Some are elastically connected. Accordingly, even if vibration is input to the link component from the road surface side while the vehicle is running, the input vibration is absorbed by the rubber elastic body disposed on the rubber bush, and the vibration transmitted to the vehicle body is attenuated and absorbed. . As the rubber bush, for example, an inner cylinder, an outer cylinder arranged on the outer peripheral side of the inner cylinder, and an inner cylinder which is respectively vulcanized and bonded to the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. Some include an elastic body made of rubber for elastically connecting to an outer cylinder and a cylindrical collar. Here, the collar constitutes a mounting axis of the link part, and the outer cylinder is press-fitted and fixed in the collar, so that the main body of the rubber bush consisting of the inner cylinder and the outer cylinder connected by the elastic body is linked. Assembled to parts.
[0003]
To briefly explain the conventional method for manufacturing a rubber bush as described above, first, an inner cylinder and an outer cylinder which have been vulcanized and bonded are set as insert cores in a mold for vulcanization molding and melted in the mold. By injecting the vulcanized rubber in the state, an elastic body is formed between the inner cylinder and the outer cylinder, and at the same time, the elastic body is vulcanized and bonded to the inner cylinder and the outer cylinder. Next, the outer cylinder connected to the inner cylinder by the elastic body is press-fitted and fixed in the collar, so that the main body of the rubber bush including the inner cylinder and the outer cylinder connected by the elastic body is arranged on the link component side. Assemble to.
[0004]
By the way, in the process of forming an elastic body, the elastic body contracts (vulcanization shrinkage) during solidification from a molten state, so that the vulcanized elastic body has a radial direction between the inner cylinder and the outer cylinder. Tensile stress along the line remains. Such a tensile stress may shorten the life of the elastic body itself or cause the elastic body to separate from the inner cylinder or the outer cylinder at an early stage. It is necessary to remove the tensile stress from the material. For this reason, when assembling a conventional rubber bush, the body of the rubber bush is press-fitted and fixed to the collar from the outer peripheral side to draw the outer cylinder together with the collar to the inner peripheral side, and the elastic body to the inner peripheral side. Pre-compression.
[0005]
Further, when the collar cannot be directly squeezed, or when it is desired to draw the outer cylinder before press-fitting into the collar, for example, a plurality of bushes are provided along the circumferential direction as in a bush device disclosed in Patent Document 1. An annular restraining member is inserted into the outer peripheral side of the outer cylinder divided into the divided pieces, and the elastic member is pre-compressed while restricting the movement of the divided piece by the restraining member. I have.
[0006]
[Patent Document 1]
JP 2000-89601 A
[Problems to be solved by the invention]
However, when assembling the conventional rubber bush as described above, the operation of press-fitting the outer cylinder connected to the inner cylinder by the elastic body into the collar and the operation of press-fitting the collar or the iris member into which the outer cylinder is inserted are performed. Work for drawing to the side is required, and a press device or the like for performing these works also requires a device for press-fitting and fixing and a device for squeezing. For this reason, the conventional rubber bush is complicated in its manufacturing operation, despite its simple structure, and requires many kinds of assembling and processing equipment for its manufacturing. There is a problem that reduction is difficult.
[0008]
Also, in the case of the bush device disclosed in Patent Document 1, the operation of inserting the restraining member on the outer peripheral side of the outer cylinder composed of a plurality of divided pieces and the operation of press-fitting and fixing the bush device into the collar are different from each other. Since it is necessary to carry out by an apparatus, various kinds of assembling and processing apparatuses are required for the assembling.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration isolator and a method of manufacturing the same that can simplify a manufacturing operation and can be easily assembled with a small number of devices in consideration of the above facts.
[0010]
[Means for Solving the Problems]
An anti-vibration device according to the present invention includes an inner cylinder connected to one of the vibration generator and the vibration receiver, and an outer cylinder arranged on the outer peripheral side of the inner cylinder and connected to the other of the vibration generator and the vibration receiver. A cylinder, an elastic body fixedly attached to an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder to elastically connect the inner cylinder and the outer cylinder, and the outer cylinder being press-fitted and fixed; A vibration reducing device having a cylindrical collar member, wherein a reduced diameter portion to which the elastic body is fixed is provided at one end side in the axial direction of the outer cylinder, and the reduced diameter portion extends in the axial direction. One end is formed with a slit that opens to one end surface of the outer cylinder, and in a state where the outer cylinder is press-fitted into the collar member, the collar member presses the reduced-diameter portion to the inner peripheral side to form the slit. The diameter of the reduced diameter portion is reduced while reducing the width of the opening along the circumferential direction.
[0011]
According to the vibration damping device of the present invention, a reduced diameter portion to which the elastic body is fixed is provided at one end side in the axial direction of the outer cylinder, and the reduced diameter portion extends in the axial direction and has one end portion of the outer cylinder. A slit that opens to one end of the collar is formed, and with the outer cylinder pressed and fixed in the collar member, the reduced diameter portion is pressed inward by the collar member to narrow the slit opening width along the circumferential direction. While reducing the diameter of the reduced diameter portion, the outer cylinder connected to the inner cylinder via the elastic body is pressed into the collar member, and the opening width of the slit formed in the reduced diameter section is narrowed along the circumferential direction. Since the diameter of the reduced diameter portion can be reduced, the elastic body fixed to the inner peripheral surface of the reduced diameter portion and the outer peripheral surface of the inner cylinder is pre-compressed (pre-compressed) in the radial direction, and remains on the elastic body. The applied tensile stress can be eliminated. Therefore, as compared with the conventional bush type vibration damping device, the outer cylinder connected to the inner cylinder via the elastic body is pressed into the collar member and then the collar member is drawn, or the inner cylinder is connected via the elastic body. It is not necessary to insert a restraining member on the outer peripheral side of the outer cylinder composed of a plurality of divided pieces before press-fitting the outer cylinder connected to the collar member to the collar member, so that the assembling work is simplified and the The type of device can be reduced.
[0012]
The method for manufacturing a vibration isolator according to the present invention is the method for manufacturing a vibration isolator according to claim 1, 2, 3, or 4, wherein the outer cylinder is connected to the inner cylinder via the elastic body. A press-fitting step of press-fitting the reduced-diameter portion to the inner peripheral side by the collar member while press-fitting the inside of the collar member, thereby reducing the opening width of the slit along the circumferential direction and simultaneously reducing the diameter of the reduced-diameter portion. It is characterized by including.
[0013]
According to the method of manufacturing the vibration isolator according to the present invention, while the outer cylinder to which the inner cylinder is connected via the elastic body is pressed into the collar member, the reduced diameter portion is applied to the inner peripheral side by the collar member. The outer cylinder connected to the inner cylinder via the elastic body is pressed into the collar member by simultaneously pressing the outer cylinder connected to the inner cylinder through the elastic body by narrowing the opening width of the slit along the circumferential direction and reducing the diameter of the reduced diameter section. Since the diameter of the reduced diameter portion can be reduced while narrowing the opening width of the formed slit along the circumferential direction, the elastic bodies fixed to the inner peripheral surface of the reduced diameter portion and the outer peripheral surface of the inner cylinder in the radial direction, respectively. Pre-compression along, and the tensile stress remaining in the elastic body can be eliminated. Therefore, in comparison with the conventional manufacturing method of the bush type vibration damping device, the step of pressing the outer cylinder connected to the inner cylinder through the elastic body into the collar member and then drawing the collar member or through the elastic body Before the outer cylinder connected to the inner cylinder is pressed into the collar member, the step of inserting the restraining member on the outer peripheral side of the outer cylinder composed of a plurality of divided pieces can be omitted, so that the assembling work is simplified. In addition, the types of devices required for assembly can be reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rubber bush and a method for manufacturing the same according to an embodiment of the present invention will be described with reference to the drawings.
[0015]
(Structure of rubber bush)
FIG. 1 shows a rubber bush, which is a vibration isolator according to an embodiment of the present invention. The rubber bush 10 constitutes a part of a rod-shaped lower arm 12 shown in FIG. 4, and the lower arm 12 is applied as a link component constituting a suspension in a vehicle such as an automobile.
[0016]
As shown in FIG. 4, the lower arm 12 is provided with a hollow pipe-shaped rod portion 14, and a cylindrical collar 16 is fixed to each end of the rod portion 14 by welding or the like. A bush body 18 of a rubber bush 10 formed as a whole and having a substantially cylindrical shape is press-fitted and fixed inside the collar 16, and the bush body 18 and the collar 16 constitute the rubber bush 10. . As shown in FIG. 1, the bush body 18 includes an inner cylinder 20, an outer cylinder 22 disposed on an outer peripheral side of the inner cylinder 20, and an outer peripheral surface of the inner cylinder 20 and an inner peripheral surface of the outer cylinder 22. And an elastic body 24 made of rubber and elastically connecting the inner cylinder 20 and the outer cylinder 22 to each other by vulcanization bonding. The following description will be made with the direction along the axis S of the inner cylinder 20 as the axial direction of the rubber bush 10 and the direction orthogonal to the axial direction as the radial direction of the rubber bush 10.
[0017]
As shown in FIG. 2, the inner cylinder 20 and the outer cylinder 22 are each formed in a substantially cylindrical shape and are arranged substantially coaxially. Here, the outer cylinder 22 is provided with a reduced diameter portion 26 at one end side (lower side in FIG. 2A) along the axial direction, and has a larger diameter than the reduced diameter portion 26 at the other end side. The press-fit portion 28 is provided coaxially. The outer cylinder 22 has a contact portion 30 in which the outer diameter increases in a tapered shape from one end to the other end between the reduced diameter portion 26 and the press-fit portion 28 along the axial direction. The reduced diameter portion 26 and the press-fit portion 28 are connected via the portion 30.
[0018]
As shown in FIG. 1, the elastic body 24 has a thick cylindrical rubber main body 32 and extends axially outward from the inner peripheral side of the rubber main body 32 to cover the outer peripheral surface of the inner cylinder 20. The thin covering portion 34 is integrally formed (vulcanized). The rubber main body 32 is disposed between one end of the outer peripheral surface of the inner cylinder 20 and the reduced diameter portion 26 of the outer cylinder 22 along the axial direction. Each is vulcanized and bonded to the inner peripheral surface. Thereby, the inner cylinder 20 and the outer cylinder 22 are elastically connected by the rubber main body 32. The rubber body 32 is formed in a substantially trapezoidal shape such that the cross-sectional shape along the axial direction gradually decreases in width from the inner peripheral side to the outer peripheral side.
[0019]
As shown in FIG. 2, an elongated slit 36 is formed in the reduced diameter portion 26 of the outer cylinder 22 so as to extend in the axial direction. The slit 36 is formed so as to penetrate the reduced diameter portion 26 in the radial direction, and one end thereof is opened to one end surface of the reduced diameter portion 26. In the slit 36, a chamfered portion 38 formed in a semicircular shape is formed at the other end in order to reduce stress concentration, and the occurrence of cracks and the like starting from the other end of the slit 36 is prevented. ing. Here, as shown in FIG. 2B, two slits 36 are formed in the reduced diameter portion 26 so as to be at equal intervals (180 ° intervals) along the circumferential direction. The slit 36 has a constant initial opening width W along the circumferential direction except for the chamfered portion 38, and the opening width W is such that two slits 36 are formed in the reduced diameter portion 26. In this case, for example, the length is set to about 1% to 10% of the outer peripheral length of the reduced diameter portion 26. On the outer peripheral surface of the rubber body portion 32 of the elastic body 24, a groove portion 40 facing the slit 36 of the outer cylinder 22 and having substantially the same width and length as the slit 36 is formed.
[0020]
On the other hand, the collar 16 fixed to the rod portion 14 is formed in a substantially cylindrical shape thicker than the outer cylinder 22, as shown in FIG. The collar 16 is provided with a compression portion 42 at one end (the lower side in FIG. 2A) along the axial direction, and a press-fit portion 44 having a larger diameter than the compression portion 42 at the other end. It is provided coaxially. The collar 16 has a contact portion 46 whose outer diameter is tapered from one end to the other end between the compression portion 42 and the press-fit portion 44 along the axial direction. The compression section 42 and the press-fitted section 44 are connected via the contact section 46.
[0021]
Here, the inner diameter of the compression portion 42 and the inner diameter of the press-fit portion 44 in the collar 16 are smaller by a predetermined length than the outer diameter of the reduced diameter portion 26 and the outer diameter of the press-fit portion 28 in the outer cylinder 22, respectively. . Specifically, the compression portion 42 of the collar 16 has an inner diameter smaller than the inner diameter of the interference fit with respect to the outer diameter of the reduced diameter portion 26, and the compression portion 42 of the collar 16 is It has an interference fit with the diameter. Here, the inner diameter of the compression section 42 is set smaller than the inner diameter of the interference fit by a length corresponding to the opening width W of the slit 36. The contacted portion 46 is formed in a tapered shape having a stronger inclination than the contact portion 30 as shown in FIG.
[0022]
The bush body portion 18 constituted by the inner cylinder 20 and the outer cylinder 22 connected by the elastic body 24 is fixed to the collar 16 by being pressed into a predetermined fixed position in the collar 16 as shown in FIG. The rubber bush 10 is formed together with the collar 16. In the rubber bush 10, the outer cylinder 22 is press-fitted into a fixed position in the collar 16, so that the reduced diameter portion 26 of the outer cylinder 22 is inserted into the inner peripheral side of the compression section 42 of the collar 16, and the outer cylinder 22 is The press-fit portion 28 of the collar 16 is inserted into the inner peripheral side of the press-fit portion 44 of the collar 16, and the contact portion 30 of the outer cylinder 22 contacts the contact portion 46 of the collar 16.
[0023]
When the bush body 18 is pressed into the fixed position in the collar 16, the compression part 42 presses the diameter-reduced part 26 of the outer cylinder 22 to the inner peripheral side, thereby forming the two slits 36 in the diameter-reduced part 26. Are reduced by an equal amount, and the inner diameter of the reduced diameter portion 26 is reduced by a length substantially corresponding to the reduced amount.
[0024]
At this time, the opening width of the slit 36 after being press-fitted by the compression portion 42 is most preferably substantially zero over substantially the entire length of the groove, but 1% or less of the initial opening width W (see FIG. 2). It is enough to narrow down to. That is, in the rubber bush 10, by appropriately adjusting the number of slits 36 formed in the reduced diameter portion 26 and the initial opening width W, the amount of reduced diameter of the reduced diameter portion 26 press-fitted into the collar 16 is increased or decreased. Can be adjusted. Further, since the groove 40 is formed in the rubber body 32 of the elastic body 24 so as to face the slit 36, a part of the elastic body 24 is prevented from being caught in the slit 36.
[0025]
When the bush main body 18 is press-fitted to a fixed position in the collar 16, the inner peripheral surface of the press-fitted portion 44 of the collar 16 and the outer peripheral surface of the press-fitted portion 28 of the outer cylinder 22 exert each other in the radial direction. Pressing is performed by the matching restoring force, and a frictional force is generated between the press-fitted portion 44 and the press-fitted portion 28 according to the pressing force. At this time, the press-fitting portion 28 of the outer cylinder 22 has a sufficiently large rigidity along the radial direction as compared with the reduced-diameter portion 26 in which the slit 36 is formed. For this reason, the frictional force generated between the press-fitted portion 44 and the press-fitted portion 28 also becomes sufficiently large, and the outer cylinder 22 is reliably restrained by the collar 16 due to the frictional force. From the collar 16 and the movement of the collar 16 are prevented.
[0026]
Of course, a frictional force also occurs between the compression portion 42 of the collar 16 and the reduced diameter portion 26 of the outer cylinder 22, but the rigidity of the reduced diameter portion 26 of the outer cylinder 22 along the radial direction is smaller than the rigidity of the press-fit portion 28. Is also significantly smaller, the frictional force generated between the compression portion 42 and the reduced diameter portion 26 of the outer cylinder 22 is considerably smaller than the frictional force generated between the press-fitted portion 44 and the press-fitted portion 28. .
[0027]
Further, when the bush main body 18 is press-fitted to a fixed position in the collar 16, the abutted portion 46 of the collar 16 abuts against the abutting portion 30 of the outer cylinder 22, thereby restricting the movement of the outer cylinder 22. The bush body 18 press-fitted into the inside 16 is accurately positioned at a fixed position (see FIG. 1).
[0028]
(Method of manufacturing rubber bush)
Next, a method for manufacturing the rubber bush 10 configured as described above will be described. When the rubber bush 10 is manufactured, first, the inner cylinder 20 and the outer cylinder 22 which have been subjected to the vulcanization bonding process are set as insert cores in a vulcanization molding mold (not shown), and the molten state is set in the mold. Vulcanized rubber is injected. Thereafter, the vulcanized rubber is cured by the progress of the vulcanization reaction, and the elastic body 24 is formed between the inner cylinder 20 and the reduced diameter portion 26 of the outer cylinder 22, and the outer peripheral surface of the inner cylinder 20 is reduced in diameter. The elastic bodies 24 are respectively vulcanized and bonded to the inner peripheral surface of the portion 26. When the bush main body 18 shown in FIG. 2 is manufactured in this manner, a press-fitting operation for press-fitting the bush main body 18 into the collar 16 is performed.
[0029]
The press-fitting of the bush body 18 into the collar 16 is performed using a press-fitting device 60 as shown in FIG. The press-fitting device 60 is provided with a receiving table 62 and a press-fitting jig 64 arranged so as to face each other along the vertical direction. Here, the press-fitting jig 64 is supported by a guide mechanism (not shown) so as to be able to move up and down in the vertical direction. The upper surface of the receiving base 62 and the lower surface of the press-fitting jig 64 are each formed in a flat shape extending in the horizontal direction, and have an inner diameter larger than the outer diameter of the inner cylinder 20 at the center of the upper surface of the receiving base 62. A round hole-shaped lower escape portion 66 is formed, and a round hole-shaped upper escape portion 68 having substantially the same inner diameter as the lower escape portion 66 is formed coaxially at the center of the lower surface of the press-fitting jig 64. .
[0030]
Further, the press-fitting device 60 is provided with a plurality of pressurizing rods 70 connected to the upper surface side of the press-fitting jig 64. The pressurizing rod 70 is connected to a hydraulic cylinder (not shown). The hydraulic cylinder raises and lowers the press-fitting jig 64 via the pressurizing rod 70, and the pressurizing rod 70 and the press-fitting jig 64. A pressing force is applied to the outer cylinder 22 of the bush body 18.
[0031]
When press-fitting the bush body portion 18 into the collar 16, first, the collar 16 is placed on the receiving stand 62 with the press-fitted portion 44 facing upward. At this time, the position of the collar 16 is adjusted on the receiving base 62 such that the axis of the collar 16 substantially coincides with the center of the lower escape portion 66. Next, the reduced diameter portion 26 of the outer cylinder 22 in the bush body 18 is inserted into the press-fitted portion 44 of the collar 16 placed on the receiving table 62. In this state, as shown in FIG. 3, the reduced diameter portion 26 is temporarily fixed at a position where its lower end abuts against the abutted portion 46 of the collar 16 along the vertical direction, and the bush body 18 is The collar 16 is held by the collar 16 so that the axis substantially coincides with the axis of the collar 16.
[0032]
Thereafter, the press-fitting jig 64 waiting at the standby position sufficiently separated from the receiving stand 62 is brought into contact with the upper end surface of the outer cylinder 22 of the bush body 18, and the pressure from the hydraulic cylinder is applied to the pressure rod. It acts on the outer cylinder 22 via 70 and the press-fitting jig 64. Due to the pressure from the hydraulic cylinder, the reduced diameter portion 26 of the outer cylinder 22 is press-fitted into the compression portion 42 of the collar 16, and at the same time, the press-fit portion 28 of the outer cylinder 22 is pressed into the press-fitted portion 44 of the collar 16. Go. At this time, the reduced diameter portion 26 of the outer cylinder 22 is pressed into the compression portion 42 of the collar 16, and at the same time, the portion of the reduced diameter portion 26 inserted into the compression portion 42 is When the inner peripheral side is pressurized, the opening widths of the two slits 36 formed in the reduced diameter portion 26 are reduced substantially uniformly, and the reduced diameter portion 26 is reduced in diameter by a predetermined amount. Accordingly, the rubber body 32 of the elastic body 24 disposed between the reduced diameter portion 26 and the inner cylinder 20 is pre-compressed (pre-compressed) along the radial direction.
[0033]
In the press-fitting device 60, when the contact portion 30 of the outer cylinder 22 comes into contact with the contacted portion 46 of the collar 16 during press-fitting of the collar 16 of the bush body portion 18, the press-fit resistance of the outer cylinder 22 increases. Operates and the hydraulic cylinder stops automatically. As a result, the bush main body 18 is press-fitted to the fixed position in the collar 16 (see FIG. 1), and the manufacture of the rubber bush 10 is completed. At this time, the entire reduced-diameter portion 26 of the outer cylinder 22 is pressed into the compression portion 42 of the collar 16, and the entire press-fit portion 28 of the outer cylinder 22 is also pressed into the press-fitted portion 44 of the collar 16.
[0034]
According to the rubber bush 10 according to the embodiment of the present invention described above, the reduced diameter portion 26 to which the rubber main body portion 32 of the elastic body 24 is fixed is provided at one end side in the axial direction of the outer cylinder 22 and the reduced diameter portion is provided. Two slits 36 extending in the axial direction and having one end opening to one end surface of the outer cylinder 22 are formed in the part 26, and the outer cylinder 22 of the bush body 18 is press-fitted and fixed in the collar 16. The compressed portion 42 of the collar 16 presses the reduced diameter portion 26 to the inner peripheral side to reduce the diameter of the reduced diameter portion 26 while reducing the opening width of the slit 36, thereby connecting to the inner cylinder 20 via the rubber main body 32. The reduced diameter portion 26 can be press-fitted into the collar 16 and the diameter of the reduced diameter portion 26 can be reduced while uniformly reducing the opening widths of the two slits 36 formed in the reduced diameter portion 26. Elasticity respectively fixed to the inner cylinder 20 The rubber main body 32 of the 24 pre-compressed (pre-compression) along the radial direction, can eliminate the residual have tensile stress to the rubber main body 32.
[0035]
Therefore, in comparison with the conventional rubber bush, according to the rubber bush 10 according to the present embodiment, after the outer cylinder connected to the inner cylinder via the elastic body is pressed into the collar, the collar is drawn by a press device or the like. It is not necessary to insert a restraining member on the outer peripheral side of an outer cylinder consisting of a plurality of divided pieces before press-fitting the outer cylinder connected to the inner cylinder via the elastic body into the collar. This greatly simplifies and reduces the number of devices required for assembly.
[0036]
Further, according to the method for manufacturing a rubber bush according to the embodiment of the present invention, while the bush body 18 is being pressed into the collar 16, the compressed portion 42 of the collar 16 presses the reduced diameter portion 26 to the inner peripheral side, By narrowing the opening width of the slit 36 and reducing the diameter of the reduced diameter portion 26, the bush body 18 is pressed into the collar 16 and at the same time, the opening width of the two slits 36 formed in the reduced diameter portion 26 is reduced. Since the diameter of the reduced diameter portion 26 can be reduced while being uniformly narrowed, the rubber main body portion 32 disposed between the reduced diameter portion 26 and the inner cylinder 20 is pre-compressed (pre-compressed) in the radial direction, and the rubber main body 32 is compressed. The tensile stress remaining in the portion 32 can be eliminated.
[0037]
Therefore, in comparison with the conventional manufacturing method of the bush type vibration damping device, the step of pressing the outer cylinder connected to the inner cylinder through the elastic body into the collar member and then drawing the collar or through the elastic body Before press-fitting the outer cylinder connected to the inner cylinder into the collar member, the step of inserting the restraining member on the outer peripheral side of the outer cylinder composed of a plurality of divided pieces can be unnecessary, so that the assembling work is simplified, The type of equipment required for assembly can also be reduced.
[0038]
In the present embodiment, only the case where the rubber bush 10 is applied to the lower arm 12 of a vehicle has been described. Needless to say, there is.
[0039]
【The invention's effect】
As described above, according to the present invention, according to the rubber bush and the method for manufacturing the same, the manufacturing operation can be simplified, and the assembly can be easily performed with a small number of devices.
[Brief description of the drawings]
FIG. 1 is an axial sectional view showing a configuration of a rubber bush according to an embodiment of the present invention.
FIG. 2 is a side view and a plan view showing a bush main body in the rubber bush shown in FIG.
FIG. 3 is a side sectional view showing a press-fitting device used for manufacturing a rubber bush according to the embodiment of the present invention, and a collar and a bush main body mounted on the press-fitting device.
FIG. 4 is a perspective view showing a lower arm to which the rubber bush according to the embodiment of the present invention is applied.
[Explanation of symbols]
10. Rubber bush (anti-vibration device)
16 colors (color members)
18 Bush body part 20 Inner cylinder 22 Outer cylinder 24 Elastic body 26 Reduced diameter part 28 Press-fit part 30 Contact part 32 Rubber body part (elastic body)
36 Slit 42 Compression part 44 Press-fit part 46 Contact part

Claims

振動発生部及び振動受部の一方に連結される内筒と、
前記内筒の外周側に配置され、振動発生部及び振動受部の他方に連結される外筒と、
前記内筒の外周面と前記外筒の内周面とにそれぞれ固着されて、前記内筒と前記外筒とを弾性的に連結する弾性体と、
前記外筒が圧入固定される筒状のカラー部材とを有する防振装置であって、
前記外筒の軸方向における一端側に前記弾性体が固着される縮径部を設けると共に、該縮径部に前記軸方向へ延在し一端部が前記外筒の一端面へ開口するスリットを形成し、
前記外筒を前記カラー部材内に圧入した状態で、該カラー部材により前記縮径部を内周側へ加圧し、前記スリットの開口幅を周方向に沿って狭めつつ該縮径部を縮径させることを特徴とする防振装置。An inner cylinder connected to one of the vibration generator and the vibration receiver,
An outer cylinder disposed on the outer peripheral side of the inner cylinder and connected to the other of the vibration generating unit and the vibration receiving unit;
An elastic body fixed to the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, respectively, and elastically connecting the inner cylinder and the outer cylinder;
A vibration isolator having a cylindrical collar member to which the outer cylinder is press-fitted and fixed,
A reduced diameter portion to which the elastic body is fixed is provided on one end side in the axial direction of the outer cylinder, and a slit extending in the axial direction and having one end opening to one end surface of the outer cylinder is provided in the reduced diameter portion. Forming
In a state where the outer cylinder is pressed into the collar member, the collar member presses the reduced diameter portion to the inner peripheral side, and reduces the diameter of the reduced diameter portion while reducing the opening width of the slit along the circumferential direction. An anti-vibration device characterized by being made to work.

前記外筒の前記軸方向における他端側に前記縮径部よりも大径とされた圧入部を設け、
前記外筒を前記カラー部材内に圧入した状態で、前記圧入部と前記カラー部材との間に生じる前記軸方向に沿った摩擦力を、前記縮径部と前記カラー部材との間に生じる前記軸方向に沿った摩擦力よりも大きくしたことを特徴とする請求項１記載の防振装置。At the other end side in the axial direction of the outer cylinder is provided a press-fit portion having a larger diameter than the reduced diameter portion,
In a state where the outer cylinder is press-fitted into the collar member, the frictional force generated between the press-fit portion and the collar member along the axial direction is generated between the reduced diameter portion and the collar member. 2. The vibration isolator according to claim 1, wherein the frictional force is greater than the frictional force along the axial direction.

前記縮径部に前記スリットを前記周方向に沿って複数形成したことを特徴とする請求項１又は２記載の防振装置。The vibration isolator according to claim 1, wherein a plurality of the slits are formed in the reduced diameter portion along the circumferential direction.

前記縮径部と前記圧入部との間に段差状の当接部を設けると共に、前記カラー部材の内周面における軸方向中間部に前記当接部に対応する段差状の被当接部を設け、
前記外筒を前記カラー部材内に圧入固定する際に、前記当接部を前記被当接部に突き当てて前記カラー部材内における前記外筒を前記軸方向に沿って所定の固定位置へ位置決めすることを特徴とする請求項２又は３記載の防振装置。A step-shaped contact portion is provided between the reduced diameter portion and the press-fit portion, and a step-shaped contacted portion corresponding to the contact portion is provided at an axially intermediate portion of the inner peripheral surface of the collar member. Provided,
When the outer cylinder is press-fitted and fixed in the collar member, the abutting portion abuts against the abutted portion to position the outer cylinder in the collar member at a predetermined fixed position along the axial direction. The anti-vibration device according to claim 2 or 3, wherein the vibration is reduced.

請求項１、２、３又は４記載の防振装置の製造方法であって、
前記弾性体を介して前記内筒が連結された前記外筒を前記カラー部材内に圧入しつつ、該カラー部材により前記縮径部を内周側へ加圧し、前記スリットの開口幅を周方向に沿って狭めると同時に該縮径部を縮径させる圧入工程を含むことを特徴とする防振装置の製造方法。It is a manufacturing method of the vibration isolator of Claim 1, 2, 3, or 4, Comprising:
While press-fitting the outer cylinder to which the inner cylinder is connected via the elastic body into the collar member, the collar member presses the reduced-diameter portion to the inner peripheral side, thereby increasing the opening width of the slit in the circumferential direction. And a press-fitting step of reducing the diameter of the reduced-diameter portion at the same time.