JP2004353798A - Vibration control device and its manufacturing method - Google Patents

Vibration control device and its manufacturing method Download PDF

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Publication number
JP2004353798A
JP2004353798A JP2003153850A JP2003153850A JP2004353798A JP 2004353798 A JP2004353798 A JP 2004353798A JP 2003153850 A JP2003153850 A JP 2003153850A JP 2003153850 A JP2003153850 A JP 2003153850A JP 2004353798 A JP2004353798 A JP 2004353798A
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rubber elastic
elastic body
peripheral surface
adhesive
cylinder
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JP4371708B2 (en
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Keiichi Funakoshi
恵一 船越
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Kurashiki Kako Co Ltd
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Kurashiki Kako Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To increase rigidity in a direction orthogonal to an axis while decreasing wrenched rigidity, in a vibration control device 1 having an inner cylinder body 2, an outer cylinder body 3, and a rubber elastic body connecting the inner cylinder body 2 with the outer cylinder body 3. <P>SOLUTION: An outer peripheral face of the rubber elastic body 4 is made to abut on an inner circumferential face of the outer cylinder body 3 over a whole area in an axial direction of the cylinder, a part of the area in the axial direction of the cylinder is a bonded part 41 bonded with an inner peripheral face of the outer cylinder body 3, and the other area is a non-contact part 42 not bonded to the inner circumferential face. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、自動車のサスペンションブッシュ等に利用される筒型の防振装置、及びその製造方法に関する。
【0002】
【従来の技術】
従来より、自動車のサスペンションブッシュに利用される防振装置として、内筒体と、この内筒体に同軸に配設された外筒体と、内筒体と外筒体との間に配設されて両筒体を互いに連結するゴム弾性体とを備えた防振装置が知られている(例えば特許文献1〜特許文献4参照)。
【0003】
この内、特許文献1の防振装置は、筒軸方向の一方向側の剛性を、他方向側の剛性よりも高く設定して、筒軸方向の剛性の特性を非対称にしている。
【0004】
また、特許文献2の防振装置は、ゴム弾性体と外筒体とを非接着にすることによって、こじり(筒軸に直交する軸回りの傾動)剛性を低下させている。
【0005】
さらに、特許文献3,4の防振装置は、ゴム弾性体の外周面に凹溝を設け、この凹溝内に接着剤を充填することによって、ゴム弾性体の外周面における筒軸方向の全領域を外筒体に接着させている。
【0006】
【特許文献1】
特開平10−274282号公報
【特許文献2】
特開平11−117974号公報
【特許文献3】
特開平10−78069号公報
【特許文献4】
特開平10−122286号公報
【0007】
【発明が解決しようとする課題】
ところで、自動車等の車両サスペンション用ブッシュにおいては、操縦安定性を向上させるために、軸直剛性(筒軸に直交する方向の剛性)を高めたいという要求がある一方で、乗り心地を向上させるためにこじり剛性を低くしたいという要求がある。
【0008】
例えば、防振装置に軸直外力が入力したときには、筒軸方向の全領域でゴム弾性体の一方が軸直方向に圧縮され、他方が軸直方向に引っ張られることになる。このため、軸直剛性を高めるには、図4(a)に示すように、ゴム弾性体4の外周面と外筒体3の内周面とが当接する筒軸方向の長さA(接着する長さ)を長くすればよい。
【0009】
一方、防振装置にこじり外力が入力したときには、筒軸方向の両端部の一方が軸直方向に圧縮され、他方が軸直方向に引っ張られる。このため、こじり剛性を低下させるには、図4(b)に示すように、ゴム弾性体4の外周面と外筒体3の内周面とが接着する長さAを短くすればよい。
【0010】
しかしながら、軸直剛性を高めるべく、ゴム弾性体4の外周面と外筒体3の内周面とが接着する長さAを長くすると、こじり剛性も同様に高くなってしまう。一方、こじり剛性を低下させるべく、ゴム弾性体4の外周面と外筒体3の内周面とが接着する長さAを短くすると、軸直剛性も同様に低下してしまう。このように、従来の防振装置では、軸直剛性を高めることと、こじり剛性を低下させることを両立させることは極めて困難である。
【0011】
尚、特許文献1,2に記載された防振装置は、ストッパ機構を設けたり、外筒体の端部を曲げ加工したりすることで、防振装置の特性を変化させているため、製造コストが増大してしまうという不都合がある。
【0012】
本発明は、このような事情に鑑みてなされたものであり、その目的とするところは、内筒体と、外筒体と、該両筒体を互いに連結するゴム弾性体とを備えた防振装置において、軸直剛性を高める一方でこじり剛性を低下させることにあり、しかも、こうした特性を有する防振装置を低コストで製造可能することにある。
【0013】
【課題を解決するための手段】
本発明の防振装置は、振動源側と振動受側との間に介設される筒型の防振装置であって、内筒体と、上記内筒体の外周囲を囲むように該内筒体と同軸に配設された外筒体と、上記内筒体と外筒体との間に配設されて該両筒体を互いに連結するゴム弾性体と、を備える。
【0014】
そして、上記ゴム弾性体の外周面を、筒軸方向の全領域に亘って上記外筒体の内周面に当接させると共に、上記外周面の一部領域を上記外筒体の内周面に接着した接着部としかつ、その他の領域を上記内周面に非接着とした非接着部とする。
【0015】
この構成によると、ゴム弾性体の外周面は、筒軸方向の全領域に亘って外筒体の内周面に当接している。防振装置に軸直外力が入力したときには、筒軸方向の全領域でゴム弾性体の一方が軸直方向に圧縮されることから、ゴム弾性体と外筒体とが当接する長さを長くすることによって、防振装置の軸直剛性は向上する。
【0016】
一方、ゴム弾性体の外周面における、筒軸方向の一部領域が接着部とされる一方で、その他の領域は非接着部とされる。これにより、ゴム弾性体の外周面と外筒体の内周面とが接着する長さが短くなり、防振装置のこじり剛性は低下する。
【0017】
その結果、軸直剛性を高めることと、こじり剛性を低下させることとが両立し、それによってこの防振装置をサスペンションブッシュに利用したときには、操縦安定性と乗り心地とが両立する。
【0018】
また、本発明の防振装置は、ゴム弾性体の一部領域を接着部とし、その他の領域を非接着部とすることだけで、特性を変化させているため、低コストで製造が可能である。
【0019】
ここで、上記接着部は、ゴム弾性体の外周面における筒軸方向の略中央部に設け、上記非接着部は、上記接着部を挟んだ上記ゴム弾性体の両端部に設けることが好ましい。
【0020】
防振装置にこじり外力が入力したときには、内筒体がその筒軸方向中央点を中心として外筒体に対して相対的に回転し、それによって、ゴム弾性体における筒軸方向の両端部の一方が軸直方向に圧縮されるが、その両端部は外筒体に非接着にされていることで、ゴム弾性体の端部において引っ張りは生じない。これにより、防振装置のこじり剛性を効果的に低下させることが可能になる。
【0021】
上記接着部の径は、ゴム弾性体が外筒体に圧入される前の状態では、非接着部の径よりも大に設定することが好ましい。
【0022】
こうすることで、ゴム弾性体における接着部と非接着部との境界部分には、段差が形成される。防振装置の製造の際には、接着部に接着剤を塗布する一方で、非接着部には接着剤を塗布しないようにする必要があるため、接着部と非接着部との境界部分に段差を形成することで、接着剤の塗り分けを容易に行い得る。
【0023】
また、接着部の径を非接着部の径よりも大にすることで、ゴム弾性体を外筒体に内挿したときに、ゴム弾性体に所望の予圧縮を付与することが可能になる。
【0024】
また、上記接着部と非接着部との境界部分には、環状凹溝と環状凸部とのうちの少なくとも一方をゴム弾性体の全周に亘って設けることが好ましい。
【0025】
こうすることで、上記環状凹溝及び/又は環状凸部によって、防振装置を製造する際に接着部に塗布された接着剤が、例えばゴム弾性体の圧入時等において、非接着部側に流れることが防止される。その結果、非接着部の非接着状態を確実に確保することが実現する。
【0026】
本発明の防振装置の製造方法は、内筒体と、外筒体と、ゴム弾性体と、を備え、上記ゴム弾性体の外周面が、筒軸方向の全領域に亘って上記外筒体の内周面に当接すると共に、上記外周面の一部領域が上記外筒体の内周面に接着された接着部とされかつ、その他の領域が上記内周面に非接着とされた非接着部とされた防振装置の製造方法である。
【0027】
この製造方法は、上記内筒体とゴム弾性体とを加硫一体化成形する加硫一体化成形ステップと、上記ゴム弾性体の外周面に塩素化処理を施す塩素化処理ステップと、上記ゴム弾性体の外周面に接着剤を塗布する処理をする接着剤塗布処理ステップと、上記内筒体及びゴム弾性体を外筒体内に圧入する圧入ステップと、を含み、上記塩素化処理ステップ及び接着剤塗布処理ステップのうちのいずれか一方のステップを、ゴム弾性体の接着部を含む所定の領域に処理を施すステップとする。
【0028】
この構成によると、加硫一体化成形ステップでは、内筒体とゴム弾性体との一体化物が形成される。続く塩素化処理ステップでは、ゴム弾性体の外周面に塩素化処理が施される。これによって、ゴム弾性体の外周面が荒らされて接着剤の接着性が高まる。
【0029】
そして、接着剤塗布処理ステップでは、上記ゴム弾性体の外周面に接着剤が塗布され、その状態で、圧入ステップでは、内筒体とゴム弾性体とからなる一体化物を外筒体内に圧入する。こうして、防振装置が完成する。
【0030】
ここで、ゴム弾性体の外周面のうち、塩素化処理と接着剤塗布処理との双方の処理が施された部分が、外筒体の内周面に接着する接着部となる。従って、上記両処理のうち、いずれか一方の処理が施された部分は、外筒体に非接着の非接着部となる。そこで、塩素化処理ステップ及び接着剤塗布処理ステップのうちのいずれか一方のステップは、ゴム弾性体の接着部を含む所定の領域に処理を施すステップとする。つまり、塩素化処理ステップで、接着部を含む所定の領域(非接着部が含まれてもよい)に塩素化処理を行った場合は、接着剤塗布処理ステップでは、接着部のみに接着剤を塗布する。逆に、塩素化処理ステップで、接着部のみに塩素化処理を行った場合は、接着剤塗布処理ステップでは、接着部を含む所定の領域(非接着部が含まれてもよい)に接着剤を塗布する。
【0031】
こうして、表面処理と接着剤塗布処理とうちのいずれか一方の処理は、接着部のみに行う必要がないため、防振装置の製造の容易化が図られる。
【0032】
尚、塩素化処理に用いる処理溶液と、ゴム弾性体の外周面に塗布する接着剤とを比較すると、処理溶液の方が粘度が低い。このため、塩素化処理はローラを用いて処理溶液を塗布することにより、所望の領域にのみ処理を施すことが比較的容易である。このことから、例えば塩素化処理を接着部にのみ施し、接着剤塗布処理を接着部を含む所定の領域に施すことが好ましい。
【0033】
【発明の効果】
以上説明したように、本発明の防振装置によれば、ゴム弾性体の外周面における筒軸方向の全領域を外筒体に当接させた状態にして、そのうちの一部領域を外筒体に接着された接着部として、その他の領域を外筒体に非接着とされた非接着部とすることで、製造コストを増大させることなく、軸直方向の剛性を高める一方で、こじり方向の剛性を低下させることができる。その結果、この防振装置をサスペンションブッシュに適用したときには、操縦安定性の向上と乗り心地の向上とを両立させることができる。
【0034】
また、本発明の防振装置の製造方法によれば、ゴム弾性体の外周面に塩素化処理を施す塩素化処理ステップ、及びその外周囲に接着剤の塗布処理を施す接着剤塗布処理ステップのうちのいずれか一方は、ゴム弾性体の接着部を含む所定の領域に処理を施すことで、防振装置の製造の容易化を図ることができる。
【0035】
【発明の実施の形態】
以下、本発明の実施形態を図面に基いて説明する。
【0036】
図1は、本発明の実施形態に係る防振装置1の断面図であり、このものは、例えば自動車のサスペンション用ブッシュとして用いられる防振装置1である。
【0037】
この防振装置1は、円筒状の内筒体2と、該内筒体2の外周面を囲むように内筒体2の筒軸Xと略同軸に配置された円筒状の外筒体3と、これら内筒体2と外筒体3との間に配設されて該両筒体2,3を互いに連結する円筒状のゴム弾性体4とを備えている。
【0038】
上記外筒体3の外周面には、サスペンションリンク5の端部が溶接により取付固定されている。
【0039】
上記ゴム弾性体4の外周面の筒軸X方向中央部分は、上記外筒体3の内周面に対して圧入接着された接着部41とされ、この接着部41を挟んだ筒軸X方向両端部分は、上記外筒体3の内周面に当接した状態で非接着とされた非接着部42とされている。
【0040】
上記接着部41の、外筒体3への圧入前の外径は、図2に示すように、上記非接着部42の外径に比べて大に設定されていて、これにより、接着部41と非接着部42との境界部分には、段差Δrが形成されている。こうして、接着部41と非接着部42との境界部分を明確化して、接着部41のみが外筒体に接着された防振装置1の製造の容易化を図っている。また、ゴム弾性体4を外筒体3に圧入したときには、接着部41が所定の圧入率となり、それによってゴム弾性体4に予圧縮を付与することが可能になる。尚、非接着部42の外径は外筒体3の内径と同じがそれよりも大に設定される。こうして、ゴム弾性体3を外筒体3に圧入したときには、非接着部42が外筒体3の内周面に当接した状態となるようにする。尚、段差Δrは、0.5mm程度とするのが好ましい。
【0041】
また、上記接着部41と非接着部42との境界部分には、環状凹溝43と、環状凸部44とが、ゴム弾性体4の全周囲に亘って設けられている。このうち、環状凹溝43は接着部41側となるように、環状凸部44は非接着部42側となるように、互いに隣り合って設けられている。
【0042】
次に、上記構成の防振装置1の製造方法について、図3を参照しながら説明する。先ず、内筒体2を成形金型内にインサートした状態でゴム弾性体4を該内筒体2と一体に加硫一体化成形することで、内筒体2とゴム弾性体4とが結合させた一体成形品6を作製する(同図のP1参照)。
【0043】
次に、この一体成形品6の外周面における接着部41の領域に塩素化処理を施す(同図のP2参照)。これにより、接着部41の表面を荒らす。
【0044】
続いて、上記一体成形品6の外周面における接着部41の領域に熱硬化性の接着剤(例えばウレタン系接着剤)を塗布する(同図のP3参照)。
【0045】
そして、上記接着剤が塗布された一体成形品6を、外筒体3に圧入する。このときに、上記外筒体3は、予め上記接着剤が硬化可能な温度以上に加熱しておいてもよいし、上記一体成形品6の圧入後に加熱をして接着剤を硬化させてもよい。
【0046】
こうして、ゴム弾性体4の接着部41は外筒体3に接着する一方で、非接着部42は外筒体3に非接着の防振装置1が完成する。
【0047】
このように、本実施形態に係る防振装置1は、ゴム弾性体4の外周面が、筒軸X方向の全領域に亘って外筒体3の内周面に当接している。つまり、ゴム弾性体4と外筒体3とが筒軸X方向に当接する長さが長くなる。このため、防振装置1に軸直外力が入力したときには、筒軸X方向の全領域でゴム弾性体4の一方が軸直方向に圧縮されることから、防振装置1の軸直剛性が向上する。
【0048】
一方、ゴム弾性体4の外周面における、筒軸X方向の中央部分が接着部41とされる一方で、両端部分が非接着部42とされているため、ゴム弾性体4の外周面と外筒体3の内周面とが接着する長さが短くなり、防振装置1のこじり剛性は低下する。
【0049】
その結果、この防振装置1は、軸直剛性を高めることと、こじり剛性を低下させることとを両立することができる。このため、サスペンションブッシュに用いられるこの防振装置1は、操縦安定性と乗り心地とを両立させることができる。
【0050】
また、この防振装置1は、接着部41と非接着部42とを設けることだけで、その特性を変化させているため、製造コストの低減化を図ることができる。
【0051】
ここで、図1に示すように、接着部41の筒軸X方向長さをAとし、非接着部42の筒軸X方向長さをBとしたときに、A≧(B×2)を満たすように、接着部41及び非接着部42の長さを設定することが好ましい。ゴム弾性体4と外筒体3との間で要求される接着力を確保には、接着部41はある程度長さが必要なためである。
【0052】
また、接着部41と非接着部42との境界部分に段差Δrを設けることによって、防振装置1の製造時において、接着部41と非接着部42との境界が明確になり、塩素化処理及び接着剤塗布処理を容易に行うことができる。
【0053】
さらに、接着部41と非接着部42との境界部分に、環状凹溝43及び環状凸部44を設けることにより、接着部41に塗布された接着剤が非接着部42側に流れることを防止することができる。これにより、外筒体3に非接着の非接着部42を確実に形成することが可能になる。
【0054】
ここで、防振装置1の製造においては、塩素化処理を、接着部41にのみ施す一方で、接着剤塗布処理は、接着部41を含む所定の領域に施してもよい。ゴム弾性体3において、塩素化処理と接着剤塗布処理との双方の処理が施された部分が、外筒体3に接着することになるため、この場合でも、非接着部42を外筒体3に非接着にすることが可能である。尚、塩素化処理を接着部41のみに施すのは、塩素化処理に用いる処理溶液は比較的粘度が低く、ローラを用いて所望の領域にのみ処理を施すことが比較的容易に行い得るためである。この場合に、接着剤塗布処理は、ゴム弾性体4の筒軸X方向の全領域に施してもよい。
【0055】
逆に、塩素化処理を、接着部41を含む処理の領域に施す一方で、接着剤塗布処理を接着部41にのみ施すようにしてもよい。この場合に、塩素化処理は、ゴム弾性体4の筒軸X方向の全領域に対して施してもよい。
【0056】
−他の実施形態−
尚、上記実施形態では、ゴム弾性体4における筒軸X方向の中央部分を接着部41とし、両端部分を非接着部42としたが、接着部41と非接着部42との領域の切り分けはこれに限らず、例えばゴム弾性体4における筒軸X方向の一方側を接着部41とし、他方側を非接着部42としてもよい。
【0057】
また、ゴム弾性体4を内筒体2と一体に加硫成形することで内筒体2とゴム弾性体4とを結合したが、ゴム弾性体4を単独で成形した後に接着剤により内筒体2と結合するようにしてもよい。
【0058】
さらに、本発明に係る防振装置1は、自動車のサスペンション用以外にも、軸直剛性を高くかつ、こじり剛性を低下させたいという要求があれば、どのようなブッシュにも適用することができる。
【図面の簡単な説明】
【図1】本発明に係る防振装置を示す断面図である。
【図2】一体成形品を示す断面図である。
【図3】防振装置の製造手順を示す説明図である。
【図4】(a)軸直剛性を高める構造の従来の防振装置、(b)こじり剛性を低下させる構造の従来の防振装置を示す断面図である。
【符号の説明】
1 防振装置
2 内筒体
3 外筒体
4 ゴム弾性体
41 接着部
42 非接着部
43 環状凹溝
44 環状凸部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cylindrical vibration isolator used for a suspension bush of an automobile and the like, and a method of manufacturing the same.
[0002]
[Prior art]
Conventionally, as an anti-vibration device used for a suspension bush of an automobile, an inner cylinder, an outer cylinder coaxially arranged with the inner cylinder, and an inner cylinder and an outer cylinder are arranged between the inner cylinder and the outer cylinder. There is known a vibration isolator provided with a rubber elastic body that connects the two cylinders to each other (for example, see Patent Documents 1 to 4).
[0003]
Among these, in the vibration damping device of Patent Document 1, the rigidity in one direction in the cylinder axis direction is set higher than the rigidity in the other direction, and the rigidity characteristics in the cylinder axis direction are asymmetric.
[0004]
Further, in the vibration damping device of Patent Literature 2, the rigidity of twisting (tilting around an axis orthogonal to the cylinder axis) is reduced by making the rubber elastic body and the outer cylinder body non-adhered.
[0005]
Further, the vibration damping devices of Patent Documents 3 and 4 provide a concave groove on the outer peripheral surface of the rubber elastic body, and fill the concave groove with an adhesive, so that the entire outer peripheral surface of the rubber elastic body in the cylinder axis direction is formed. The area is adhered to the outer cylinder.
[0006]
[Patent Document 1]
JP-A-10-274282 [Patent Document 2]
JP-A-11-117974 [Patent Document 3]
JP-A-10-78069 [Patent Document 4]
JP 10-122286 A
[Problems to be solved by the invention]
By the way, in a bush for a vehicle suspension of an automobile or the like, while there is a demand to increase the linear rigidity (rigidity in a direction perpendicular to the cylinder axis) in order to improve steering stability, it is necessary to improve ride comfort. There is a demand for lowering rigidity.
[0008]
For example, when an external force is input to the vibration isolator, one of the rubber elastic bodies is compressed in the axial direction and the other is pulled in the axial direction in the entire region in the cylinder axis direction. For this reason, in order to increase the axial rigidity, as shown in FIG. 4A, the length A (adhesion) of the cylindrical axis where the outer peripheral surface of the rubber elastic body 4 and the inner peripheral surface of the outer cylindrical body 3 are in contact with each other. Length).
[0009]
On the other hand, when an external force is input to the vibration isolator, one of the two ends in the cylinder axis direction is compressed in the axial direction, and the other is pulled in the axial direction. Therefore, in order to reduce the torsional rigidity, as shown in FIG. 4B, the length A where the outer peripheral surface of the rubber elastic body 4 and the inner peripheral surface of the outer cylinder 3 are bonded may be reduced.
[0010]
However, if the length A at which the outer peripheral surface of the rubber elastic body 4 and the inner peripheral surface of the outer cylinder 3 are bonded to increase the axial rigidity, the torsional rigidity also increases. On the other hand, if the length A at which the outer peripheral surface of the rubber elastic body 4 and the inner peripheral surface of the outer cylindrical body 3 are bonded to each other is reduced in order to reduce the torsional rigidity, the axial rigidity is similarly reduced. As described above, it is extremely difficult with the conventional vibration isolator to increase both the axial rigidity and decrease the pry rigidity.
[0011]
Note that the vibration damping devices described in Patent Literatures 1 and 2 change the characteristics of the vibration damping devices by providing a stopper mechanism or bending the end of the outer cylindrical body. There is a disadvantage that the cost increases.
[0012]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a protection device including an inner cylinder, an outer cylinder, and a rubber elastic body that connects the two cylinders to each other. It is an object of the present invention to reduce the twisting stiffness while increasing the axial rigidity, and to manufacture a vibration isolator having such characteristics at low cost.
[0013]
[Means for Solving the Problems]
An anti-vibration device of the present invention is a cylindrical anti-vibration device interposed between a vibration source side and a vibration receiving side, and includes an inner cylinder and an outer periphery of the inner cylinder. An outer cylinder is provided coaxially with the inner cylinder, and a rubber elastic body is provided between the inner cylinder and the outer cylinder to connect the two cylinders to each other.
[0014]
Then, the outer peripheral surface of the rubber elastic body is brought into contact with the inner peripheral surface of the outer cylindrical body over the entire region in the cylinder axis direction, and a part of the outer peripheral surface is formed on the inner peripheral surface of the outer cylindrical body. And the other area is a non-adhesive part which is not adhered to the inner peripheral surface.
[0015]
According to this configuration, the outer peripheral surface of the rubber elastic body is in contact with the inner peripheral surface of the outer cylinder over the entire region in the cylinder axis direction. When an external force is applied to the vibration isolator, one of the rubber elastic bodies is compressed in the axial direction in the entire region in the axial direction of the cylinder, so that the contact length between the rubber elastic body and the outer cylindrical body is increased. By doing so, the axial rigidity of the vibration isolator is improved.
[0016]
On the other hand, a part of the outer peripheral surface of the rubber elastic body in the cylinder axis direction is an adhesive part, and the other area is a non-adhesive part. This shortens the length of the bonding between the outer peripheral surface of the rubber elastic body and the inner peripheral surface of the outer cylinder, and reduces the torsional rigidity of the vibration isolator.
[0017]
As a result, increasing the axial rigidity and reducing the torsional rigidity are compatible with each other, so that when this vibration isolator is used for a suspension bush, steering stability and riding comfort are compatible.
[0018]
Also, the vibration isolator of the present invention can be manufactured at low cost because the characteristics are changed only by making a part of the rubber elastic body an adhesive part and making the other part a non-adhesive part. is there.
[0019]
Here, it is preferable that the bonding portion is provided at a substantially central portion of the outer peripheral surface of the rubber elastic body in the cylinder axis direction, and the non-bonding portion is provided at both ends of the rubber elastic body with the bonding portion interposed therebetween.
[0020]
When an external force is applied to the vibration isolator, the inner cylinder rotates relative to the outer cylinder about the center point in the cylinder axis direction, thereby forming both ends of the rubber elastic body in the cylinder axis direction. One is compressed in the direction perpendicular to the axis, but since both ends are not adhered to the outer cylinder, no tension occurs at the end of the rubber elastic body. This makes it possible to effectively reduce the torsional rigidity of the vibration isolator.
[0021]
In a state before the rubber elastic body is press-fitted into the outer cylindrical body, the diameter of the bonding portion is preferably set to be larger than the diameter of the non-bonding portion.
[0022]
In this way, a step is formed at the boundary between the bonded portion and the non-bonded portion in the rubber elastic body. When manufacturing an anti-vibration device, it is necessary to apply the adhesive to the bonded part, but not to apply the adhesive to the non-bonded part. By forming the steps, it is possible to easily apply the adhesive separately.
[0023]
Further, by making the diameter of the bonded portion larger than the diameter of the non-bonded portion, it becomes possible to apply a desired precompression to the rubber elastic body when the rubber elastic body is inserted into the outer cylinder. .
[0024]
In addition, it is preferable that at least one of the annular groove and the annular protrusion is provided over the entire circumference of the rubber elastic body at a boundary portion between the adhesive portion and the non-adhesive portion.
[0025]
By doing so, the adhesive applied to the bonding portion when the vibration isolator is manufactured can be applied to the non-bonding portion side, for example, at the time of press-fitting the rubber elastic body, by the annular concave groove and / or the annular convex portion. Flow is prevented. As a result, it is realized that the non-adhesion state of the non-adhesion portion is reliably ensured.
[0026]
The method of manufacturing a vibration isolator according to the present invention includes an inner cylinder, an outer cylinder, and a rubber elastic body, and the outer peripheral surface of the rubber elastic body extends over the entire region in the cylinder axis direction. While being in contact with the inner peripheral surface of the body, a part of the outer peripheral surface was an adhesive portion adhered to the inner peripheral surface of the outer cylindrical body, and the other region was not adhered to the inner peripheral surface. This is a method for manufacturing a vibration damping device having a non-bonded portion.
[0027]
The manufacturing method includes a vulcanization-integral molding step of vulcanization-integrally molding the inner cylinder and the rubber elastic body; a chlorination treatment step of performing a chlorination treatment on an outer peripheral surface of the rubber elastic body; An adhesive application step of applying an adhesive to the outer peripheral surface of the elastic body; and a press-fitting step of press-fitting the inner cylinder and the rubber elastic body into the outer cylinder, the chlorination step and the bonding. One of the agent application processing steps is a step of performing processing on a predetermined area including a bonded portion of the rubber elastic body.
[0028]
According to this configuration, in the vulcanization integrated molding step, an integrated product of the inner cylinder and the rubber elastic body is formed. In the subsequent chlorination step, chlorination is performed on the outer peripheral surface of the rubber elastic body. As a result, the outer peripheral surface of the rubber elastic body is roughened, and the adhesiveness of the adhesive is increased.
[0029]
Then, in the adhesive applying step, an adhesive is applied to the outer peripheral surface of the rubber elastic body, and in that state, in the press-fitting step, an integrated body including the inner cylindrical body and the rubber elastic body is pressed into the outer cylindrical body. . Thus, the vibration isolator is completed.
[0030]
Here, the portion of the outer peripheral surface of the rubber elastic body that has been subjected to both the chlorination treatment and the adhesive application treatment serves as an adhesive portion that adheres to the inner peripheral surface of the outer cylinder. Therefore, the portion subjected to either one of the above-mentioned processes becomes a non-adhesive portion that is not adhered to the outer cylinder. Therefore, one of the chlorination treatment step and the adhesive application treatment step is a step of performing a treatment on a predetermined area including the bonded portion of the rubber elastic body. That is, in the chlorination step, when a chlorination process is performed on a predetermined region including the bonded portion (a non-bonded portion may be included), the adhesive is applied only to the bonded portion in the adhesive application process step. Apply. Conversely, when the chlorination process is performed only on the bonded portion in the chlorination process step, the adhesive is applied to a predetermined region including the bonded portion (the non-bonded portion may be included) in the adhesive application process step. Is applied.
[0031]
In this way, it is not necessary to perform only one of the surface treatment and the adhesive application treatment only on the bonded portion, so that the manufacture of the vibration isolator is facilitated.
[0032]
When the treatment solution used for the chlorination treatment is compared with the adhesive applied to the outer peripheral surface of the rubber elastic body, the treatment solution has a lower viscosity. For this reason, it is relatively easy to apply the chlorination treatment only to a desired region by applying the treatment solution using a roller. For this reason, it is preferable that, for example, the chlorination treatment is performed only on the bonding portion, and the adhesive application process is performed on a predetermined region including the bonding portion.
[0033]
【The invention's effect】
As described above, according to the vibration damping device of the present invention, the entire region of the outer peripheral surface of the rubber elastic body in the cylinder axis direction is brought into contact with the outer cylinder, and a part of the region is formed by the outer cylinder. By increasing the rigidity in the axial direction without increasing the manufacturing cost by increasing the manufacturing cost by increasing the rigidity in the twisting direction, Can be reduced in rigidity. As a result, when this vibration isolator is applied to a suspension bush, it is possible to achieve both improvement in steering stability and improvement in ride comfort.
[0034]
According to the method of manufacturing a vibration isolator of the present invention, the chlorination step of performing chlorination on the outer peripheral surface of the rubber elastic body, and the adhesive application step of applying an adhesive to the outer periphery thereof. Either one of them can be applied to a predetermined region including the bonded portion of the rubber elastic body to facilitate the manufacture of the vibration isolator.
[0035]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0036]
FIG. 1 is a cross-sectional view of an anti-vibration device 1 according to an embodiment of the present invention. This is, for example, an anti-vibration device 1 used as a suspension bush of an automobile.
[0037]
The vibration isolator 1 includes a cylindrical inner cylinder 2 and a cylindrical outer cylinder 3 arranged substantially coaxially with a cylinder axis X of the inner cylinder 2 so as to surround an outer peripheral surface of the inner cylinder 2. And a rubber elastic body 4 disposed between the inner cylinder 2 and the outer cylinder 3 and connecting the two cylinders 2 and 3 to each other.
[0038]
An end of the suspension link 5 is attached and fixed to the outer peripheral surface of the outer cylindrical body 3 by welding.
[0039]
The central portion of the outer peripheral surface of the rubber elastic body 4 in the cylinder axis X direction is an adhesive portion 41 which is press-fitted and adhered to the inner peripheral surface of the outer cylinder body 3, and the cylindrical axis X direction sandwiching the adhesive portion 41 is provided. Both end portions are non-adhesive portions 42 which are non-adhesive in a state of contacting the inner peripheral surface of the outer cylindrical body 3.
[0040]
As shown in FIG. 2, the outer diameter of the bonding portion 41 before being press-fitted into the outer cylindrical body 3 is set to be larger than the outer diameter of the non-bonding portion 42. A step Δr is formed at the boundary between the and the non-adhesive portion 42. In this way, the boundary between the bonded portion 41 and the non-bonded portion 42 is clarified, and the manufacture of the vibration isolator 1 in which only the bonded portion 41 is bonded to the outer cylinder is facilitated. Further, when the rubber elastic body 4 is press-fitted into the outer cylindrical body 3, the bonding portion 41 has a predetermined press-fitting rate, whereby it is possible to apply a pre-compression to the rubber elastic body 4. Note that the outer diameter of the non-adhesive portion 42 is the same as the inner diameter of the outer cylinder 3 but is set to be larger than that. Thus, when the rubber elastic body 3 is press-fitted into the outer cylinder 3, the non-adhesive portion 42 is brought into contact with the inner peripheral surface of the outer cylinder 3. It is preferable that the step Δr be about 0.5 mm.
[0041]
An annular groove 43 and an annular convex portion 44 are provided at the boundary between the adhesive portion 41 and the non-adhesive portion 42 all around the rubber elastic body 4. Among them, the annular concave groove 43 is provided adjacent to the adhesive portion 41 and the annular convex portion 44 is provided adjacent to the non-adhesive portion 42.
[0042]
Next, a method of manufacturing the vibration isolator 1 having the above configuration will be described with reference to FIG. First, the rubber elastic body 4 is integrally vulcanized and molded integrally with the inner cylinder 2 while the inner cylinder 2 is inserted into a molding die, so that the inner cylinder 2 and the rubber elastic body 4 are joined. Then, an integrated molded product 6 is produced (see P1 in the same figure).
[0043]
Next, a chlorination treatment is performed on the area of the bonding portion 41 on the outer peripheral surface of the integrally molded product 6 (see P2 in the same figure). Thereby, the surface of the bonding portion 41 is roughened.
[0044]
Subsequently, a thermosetting adhesive (for example, a urethane-based adhesive) is applied to a region of the adhesive portion 41 on the outer peripheral surface of the integrally molded product 6 (see P3 in the same figure).
[0045]
Then, the integrally molded product 6 to which the adhesive has been applied is pressed into the outer cylinder 3. At this time, the outer cylinder 3 may be heated in advance to a temperature at which the adhesive can be cured, or the adhesive may be cured by heating after press-fitting the integrated molded article 6. Good.
[0046]
Thus, the vibration isolator 1 in which the bonding portion 41 of the rubber elastic body 4 is bonded to the outer cylinder 3 while the non-bonding portion 42 is not bonded to the outer cylinder 3 is completed.
[0047]
As described above, in the vibration isolator 1 according to the present embodiment, the outer peripheral surface of the rubber elastic body 4 is in contact with the inner peripheral surface of the outer cylinder 3 over the entire region in the cylinder axis X direction. That is, the length of contact between the rubber elastic body 4 and the outer cylinder body 3 in the cylinder axis X direction becomes longer. For this reason, when an axial direct external force is input to the vibration isolator 1, one of the rubber elastic bodies 4 is compressed in the axial direction in the entire region in the cylinder axis X direction, so that the axial rigidity of the vibration isolator 1 is reduced. improves.
[0048]
On the other hand, the center portion of the outer peripheral surface of the rubber elastic body 4 in the direction of the cylinder axis X is used as the bonding portion 41, while the both end portions are used as the non-bonding portions 42. The length of the cylindrical body 3 to be bonded to the inner peripheral surface is shortened, and the rigidity of the vibration isolator 1 is reduced.
[0049]
As a result, the vibration isolator 1 can achieve both an increase in the axial rigidity and a reduction in the pry rigidity. Therefore, the vibration isolator 1 used for the suspension bush can achieve both steering stability and ride comfort.
[0050]
In addition, since the characteristics of the vibration isolator 1 are changed only by providing the bonding portion 41 and the non-bonding portion 42, the manufacturing cost can be reduced.
[0051]
Here, as shown in FIG. 1, when the length of the bonded portion 41 in the cylinder axis X direction is A and the length of the non-bonded portion 42 in the cylinder axis X direction is B, A ≧ (B × 2) is satisfied. It is preferable to set the lengths of the bonded portion 41 and the non-bonded portion 42 so as to satisfy the conditions. This is because the bonding portion 41 needs to have a certain length in order to secure the bonding force required between the rubber elastic body 4 and the outer cylinder 3.
[0052]
Further, by providing a step Δr at the boundary between the bonded portion 41 and the non-bonded portion 42, the boundary between the bonded portion 41 and the non-bonded portion 42 becomes clear during the manufacture of the vibration damping device 1, and the chlorination treatment is performed. In addition, the adhesive application processing can be easily performed.
[0053]
Further, by providing an annular concave groove 43 and an annular convex portion 44 at a boundary portion between the bonding portion 41 and the non-bonding portion 42, the adhesive applied to the bonding portion 41 is prevented from flowing to the non-bonding portion 42 side. can do. Thereby, it is possible to reliably form the non-adhesive non-adhesive portion 42 on the outer cylinder 3.
[0054]
Here, in the manufacture of the vibration isolator 1, the chlorination process may be performed only on the bonding portion 41, while the adhesive application process may be performed on a predetermined region including the bonding portion 41. The portion of the rubber elastic body 3 that has been subjected to both the chlorination treatment and the adhesive application treatment will adhere to the outer cylinder 3. 3 can be made non-adhesive. It should be noted that the chlorination treatment is performed only on the bonding portion 41 because the treatment solution used for the chlorination treatment has a relatively low viscosity, and it is relatively easy to perform the treatment only on a desired region using a roller. It is. In this case, the adhesive application processing may be performed on the entire area of the rubber elastic body 4 in the cylinder axis X direction.
[0055]
Conversely, while the chlorination process is performed on the region including the bonding portion 41, the adhesive application process may be performed only on the bonding portion 41. In this case, the chlorination treatment may be performed on the entire region of the rubber elastic body 4 in the cylinder axis X direction.
[0056]
-Other embodiments-
In the above-described embodiment, the center portion of the rubber elastic body 4 in the cylinder axis X direction is the bonding portion 41, and both end portions are the non-bonding portions 42. However, the area of the bonding portion 41 and the non-bonding portion 42 can be divided. However, the present invention is not limited to this. For example, one side of the rubber elastic body 4 in the cylinder axis X direction may be the bonding part 41 and the other side may be the non-bonding part 42.
[0057]
Further, the rubber elastic body 4 is integrally formed with the inner cylindrical body 2 by vulcanization molding, so that the inner cylindrical body 2 and the rubber elastic body 4 are joined together. You may make it couple | bond with the body 2.
[0058]
Further, the vibration damping device 1 according to the present invention can be applied to any bush other than for a suspension of an automobile, if there is a demand to increase the axial rigidity and reduce the torsional rigidity. .
[Brief description of the drawings]
FIG. 1 is a sectional view showing a vibration isolator according to the present invention.
FIG. 2 is a sectional view showing an integrally molded product.
FIG. 3 is an explanatory diagram showing a manufacturing procedure of the vibration isolator.
4A is a cross-sectional view showing a conventional vibration damping device having a structure for increasing the axial rigidity, and FIG. 4B is a cross-sectional view showing a conventional vibration damping device having a structure for reducing the torsional rigidity.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vibration isolator 2 Inner cylinder 3 Outer cylinder 4 Rubber elastic body 41 Adhesive part 42 Non-adhesive part 43 Annular concave groove 44 Annular convex part

Claims (5)

振動源側と振動受側との間に介設される筒型の防振装置であって、
内筒体と、
上記内筒体の外周囲を囲むように該内筒体と同軸に配設された外筒体と、
上記内筒体と外筒体との間に配設されて該両筒体を互いに連結するゴム弾性体と、を備え、
上記ゴム弾性体の外周面は、筒軸方向の全領域に亘って上記外筒体の内周面に当接していると共に、上記外周面の一部領域が上記外筒体の内周面に接着された接着部とされかつ、その他の領域が上記内周面に非接着とされた非接着部とされていることを特徴とする防振装置。
A cylindrical vibration isolator provided between the vibration source side and the vibration receiving side,
An inner cylinder,
An outer cylinder disposed coaxially with the inner cylinder so as to surround the outer periphery of the inner cylinder,
A rubber elastic body disposed between the inner cylinder and the outer cylinder to couple the two cylinders to each other,
The outer peripheral surface of the rubber elastic body is in contact with the inner peripheral surface of the outer cylinder over the entire region in the cylinder axis direction, and a part of the outer peripheral surface is in contact with the inner peripheral surface of the outer cylinder. An anti-vibration device, wherein the non-adhesive portion is a non-adhesive portion that is non-adhesive to the inner peripheral surface, and the other region is a non-adhesive portion.
請求項1において、
接着部は、ゴム弾性体の外周面における筒軸方向の略中央部に設けられ、非接着部は、上記接着部を挟んだ上記ゴム弾性体の両端部に設けられている
ことを特徴とする防振装置。
In claim 1,
The bonding portion is provided at a substantially central portion of the outer peripheral surface of the rubber elastic body in the cylinder axis direction, and the non-bonding portions are provided at both ends of the rubber elastic body with the bonding portion interposed therebetween. Anti-vibration device.
請求項1又は請求項2において、
接着部の径は、ゴム弾性体が外筒体に圧入される前の状態では、非接着部の径よりも大に設定されている
ことを特徴とする防振装置。
In claim 1 or claim 2,
The vibration damping device is characterized in that the diameter of the bonded portion is set to be larger than the diameter of the non-bonded portion before the rubber elastic body is pressed into the outer cylinder.
請求項1〜請求項3のうちのいずれか1項において、
接着部と非接着部との境界部分には、環状凹溝と環状凸部とのうちの少なくとも一方がゴム弾性体の全周に亘って設けられている
ことを特徴とする防振装置。
In any one of claims 1 to 3,
An anti-vibration device wherein at least one of an annular concave groove and an annular convex portion is provided over the entire periphery of a rubber elastic body at a boundary portion between an adhesive portion and a non-adhesive portion.
請求項1に記載の防振装置を製造する方法であって、
内筒体とゴム弾性体とを加硫一体化成形する加硫一体化成形ステップと、
上記ゴム弾性体の外周面に塩素化処理を施す塩素化処理ステップと、
上記ゴム弾性体の外周面に接着剤を塗布する処理をする接着剤塗布処理ステップと、
上記内筒体及びゴム弾性体を外筒体内に圧入する圧入ステップと、を含み、
上記塩素化処理ステップ及び接着剤塗布処理ステップのうちのいずれか一方のステップは、ゴム弾性体の接着部を含む所定の領域に処理を施すステップであることを特徴とする防振装置の製造方法。
A method for manufacturing the vibration isolator according to claim 1,
Vulcanization integral molding step of vulcanization integral molding of the inner cylinder and the rubber elastic body,
A chlorination treatment step of performing a chlorination treatment on the outer peripheral surface of the rubber elastic body,
An adhesive application processing step of applying an adhesive to the outer peripheral surface of the rubber elastic body,
Press-fitting the inner cylinder and the rubber elastic body into the outer cylinder,
A method of manufacturing an anti-vibration device, wherein one of the chlorination step and the adhesive application step is a step of performing a process on a predetermined area including a bonded portion of a rubber elastic body. .
JP2003153850A 2003-05-30 2003-05-30 Vibration isolator and manufacturing method thereof Expired - Fee Related JP4371708B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
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JP2008215402A (en) * 2007-02-28 2008-09-18 Kurashiki Kako Co Ltd Rubber bushing and its manufacturing method
JP2010019379A (en) * 2008-07-11 2010-01-28 Three M Innovative Properties Co Method for manufacturing cylindrical viscoelastic damper
WO2016031536A1 (en) * 2014-08-28 2016-03-03 三菱製鋼株式会社 Method of manufacturing rubber bushing-attached stabilizer bar, and rubber bushing-attached stabilizer bar
JP2019190572A (en) * 2018-04-25 2019-10-31 倉敷化工株式会社 Anti-vibration device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008215402A (en) * 2007-02-28 2008-09-18 Kurashiki Kako Co Ltd Rubber bushing and its manufacturing method
JP2010019379A (en) * 2008-07-11 2010-01-28 Three M Innovative Properties Co Method for manufacturing cylindrical viscoelastic damper
WO2016031536A1 (en) * 2014-08-28 2016-03-03 三菱製鋼株式会社 Method of manufacturing rubber bushing-attached stabilizer bar, and rubber bushing-attached stabilizer bar
CN105555560A (en) * 2014-08-28 2016-05-04 三菱制钢株式会社 Method of manufacturing rubber bushing-attached stabilizer bar, and rubber bushing-attached stabilizer bar
US10124646B2 (en) 2014-08-28 2018-11-13 Mitsubishi Steel Mfg. Co., Ltd. Method of manufacturing rubber-bush-provided stabilizer bar and rubber-bush-provided stabilizer bar
JP2019190572A (en) * 2018-04-25 2019-10-31 倉敷化工株式会社 Anti-vibration device
JP7009300B2 (en) 2018-04-25 2022-01-25 倉敷化工株式会社 Anti-vibration device

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