JP3818791B2

JP3818791B2 - Shift lever bush

Info

Publication number: JP3818791B2
Application number: JP09481399A
Authority: JP
Inventors: 徹藤井
Original assignee: Kurashiki Kako Co Ltd
Current assignee: Kurashiki Kako Co Ltd
Priority date: 1999-04-01
Filing date: 1999-04-01
Publication date: 2006-09-06
Anticipated expiration: 2019-04-01
Also published as: JP2000291789A

Description

【０００１】
【発明の属する技術分野】
本発明は、軸方向に２分割にされた一対のシフトレバー部材のいずれか一方に形成された軸部と、他方に形成された筒状部との間に設けられるシフトレバーブッシュに関する技術分野に属する。
【０００２】
【従来の技術】
従来より、例えば実開平４−１２４５２０号公報に示されているように、軸方向（上下方向と略一致）に２分割にされた一対のシフトレバー部材のいずれか一方（トランスミッション側）に形成された軸部と、他方（シフトノブ側）に形成された筒状部との間にシフトレバーブッシュを設けることで、トランスミッション側の振動がシフトノブ側に伝達するのを防止するようにすることは知られている。このようなシフトレバーブッシュは、一方のシフトレバー部材の軸部に対して外嵌合により取り付けられる内筒体と、この内筒体の外周面を囲むように該内筒体の筒軸と略同軸に配置され、他方のシフトレバー部材の筒状部に対して内嵌合により取り付けられる外筒体と、これら内筒体及び外筒体間に配設され、該両筒体を互いに連結する筒状ゴム弾性体とを備えている。
【０００３】
そして、上記公報のものでは、内筒体と外筒体との間に、該両者間の径方向、ねじり方向及び軸方向の変位を制限するストッパー機構を設けることで、耐久性、操作性、振動に対する減衰性を向上させるようにすることが提案されている。
【０００４】
【発明が解決しようとする課題】
ところで、上記シフトレバーブッシュにおいては、トランスミッション側のシフトレバー部材の振動方向が主として該シフトレバー部材の軸方向（内筒体の筒軸方向）であるので、筒軸方向に軟らかくして防振効果を高くしたいという要求と、ねじり（筒軸回りの回動）特性とこじり（筒軸に垂直な径方向軸回りの回動）特性とを、初期に軟らかくその後に硬くなるように設定して操作フィーリングを向上させたいという要求とがある。
【０００５】
しかし、上記提案例（実開平４−１２４５２０号公報）のものでは、内筒体及び外筒体間のねじり方向の変位制限は、ゴム弾性体の筒軸方向端面に開口する環状の溝部における一方の周面に形成した凹部と、上記溝部内に嵌合された環状のストッパー部材に形成した、該凹部と所定の間隔をおいて係合可能な凸部との当接により行われるため、このねじり特性は上記所定間隔により初期において軟らかいものの、上記ゴム弾性体の凹部の凸部当接面は周方向に変形し易いので、この変形により当接後においてそれ程硬くすることはできない。
【０００６】
また、上記提案例のものにおいて、ゴム弾性体の内筒体と外筒体とを連結する部分の筒軸方向長さを小さくすることで、ある程度は筒軸方向に軟らかくできるものの、ゴム弾性体が内筒体と外筒体とに固着されているので、十分な防振効果は得られない。
【０００７】
本発明は斯かる点に鑑みてなされたものであり、その目的とするところは、上記のようなシフトレバーブッシュに対して、その構成を改良することによって、防振効果と操作フィーリングとを確実に向上させようとすることにある。
【０００８】
【課題を解決するための手段】
上記の目的を達成するために、請求項１の発明では、ゴム弾性体の内周面に、径方向に突出する凸部を形成する一方、内筒体の外周面に、この凸部と係合する凹部を形成し、上記凸部の筒軸方向両側における上記ゴム弾性体の内周面に、筒軸方向から見て多角形状又は楕円形状をなす一対の弾性体側嵌合部を形成する一方、上記内筒体の外周面に、この両弾性体側嵌合部と径方向に所定量の隙間があくようにそれぞれ嵌合する一対の内筒体側嵌合部を形成するようにした。
【０００９】
具体的には、この発明では、軸方向に２分割にされた一対のシフトレバー部材のいずれか一方に形成された軸部と、他方に形成された筒状部との間に設けられるシフトレバーブッシュを対象とする。
【００１０】
そして、上記一方のシフトレバー部材の軸部に対して外嵌合により取り付けられる内筒体と、上記内筒体の外周面を囲むように該内筒体の筒軸と略同軸に配置され、他方のシフトレバー部材の筒状部に対して内嵌合により取り付けられる外筒体と、上記外筒体の内周面に固着され、上記両筒体を互いに連結する筒状ゴム弾性体とを備え、上記ゴム弾性体の内周面には、径方向に突出する凸部が全周に亘って形成されている一方、上記内筒体の外周面には、上記凸部の先端部形状と対応するように凹形状をなして該凸部先端部と係合する凹部が全周に亘って形成され、上記凸部の筒軸方向両側における上記ゴム弾性体の内周面には、筒軸方向から見て多角形状又は楕円形状をなす一対の弾性体側嵌合部が形成されている一方、上記凹部の筒軸方向両側における上記内筒体の外周面には、筒軸方向から見て該両弾性体側嵌合部と対応するように多角形状又は楕円形状をなしかつ該両弾性体側嵌合部と径方向に所定量の隙間があくようにそれぞれ嵌合する一対の内筒体側嵌合部が形成されているものとする。
【００１１】
上記の構成により、凸部を筒軸方向にたわみ易い形状に形成しておくことで筒軸方向に極めて軟らかくすることができ、しかも、シフトレバーの非操作時において、内筒体とゴム弾性体とが凸部と凹部との係合のみで連結されているので、ゴム弾性体が内筒体及び外筒体の両方に固着されている場合よりもトランスミッション側の振動をシフトノブ側に伝達し難くすることができ、防振効果を確実に向上させることができる。一方、シフトレバーのシフト操作やセレクト操作により、シフトノブ側のシフトレバー部材が操作荷重を受けると、内筒体と外筒体とが相対的に筒軸回りにねじられたり、径方向軸回りにこじられたりするが、このときのねじり特性については、多角形状又は楕円形状をなす弾性体側嵌合部と、該両弾性体側嵌合部と対応するように多角形状又は楕円形状をなす内筒体側嵌合部とが径方向に所定量の隙間があくように嵌合されているので、その所定量の隙間に対応する角度だけ殆ど抵抗なくねじられるために初期は軟らかく、その後は弾性体側嵌合部と内筒体側嵌合部とが当接して硬くなる。しかも、ゴム弾性体の弾性体側嵌合部は周方向に変形し難いので、当接後は十分に硬くすることができる。また、こじり特性についても、上記所定量の隙間に対応する角度だけ殆ど抵抗なくこじられるために初期は軟らかく、その後は弾性体側嵌合部と内筒体側嵌合部とが当接して硬くなる。したがって、操作フィーリングを確実に向上させることができる。
【００１２】
請求項２の発明では、請求項１の発明において、ゴム弾性体の筒軸方向両端面と対向する位置に、内筒体と該ゴム弾性体とが相対的に筒軸方向に所定量以上移動するのを規制する２つの規制部がそれぞれ設けられているものとする。
【００１３】
このことにより、乗員がシフトノブ側のシフトレバー部材をその軸方向に引張ったり押し込んだりしたとしても、ゴム弾性体の筒軸方向端面が規制部に当接して内筒体とゴム弾性体との筒軸方向の相対移動が規制されるので、ゴム弾性体内周面の凸部と内筒体外周面の凹部との係合が解除したり、凸部が破断したりするようなことはない。よって、防振効果を高めつつ、信頼性や耐久性を向上させることができる。
【００１４】
請求項３の発明では、請求項２の発明において、規制部は、内筒体の外周面に一体に設けられているものとする。こうすることで、部品点数を増加させることなく、簡単な構成で内筒体と外筒体との軸方向の相対移動を規制することができる。
【００１５】
請求項４の発明では、請求項１、２又は３の発明において、内筒体は、内筒体側嵌合部と凹部とが形成された外周側部材と、該外周側部材の内周面に固着されかつシフトレバー部材の軸部に対して外嵌合される内周側部材との２部材で構成されているものとする。このことで、外周側部材を例えば樹脂部材とすれば、凹部と内筒体側嵌合部とを容易に形成することができ、製造コストを低減することができる。
【００１６】
請求項５の発明では、請求項１、２、３又は４の発明において、弾性体側嵌合部と内筒体側嵌合部との隙間は、径方向における互いに直交する２方向で異なるように設定されているものとする。
【００１７】
このことにより、互いに直交する２方向を、例えばシフトレバーの操作方向であるシフト方向とセレクト方向とに設定すれば、その両方向のこじり特性を互いに異ならせることができ、乗員の好みに適合した操作フィーリングを実現することができる。
【００１８】
請求項６の発明では、軸方向に２分割にされた一対のシフトレバー部材のいずれか一方に形成された軸部と、他方に形成された筒状部との間に設けられるシフトレバーブッシュを対象とする。
【００１９】
そして、上記一方のシフトレバー部材の軸部に対して外嵌合により取り付けられる内筒体と、上記内筒体の外周面を囲むように該内筒体の筒軸と略同軸に配置され、他方のシフトレバー部材の筒状部に対して内嵌合により取り付けられる外筒体と、上記内筒体の外周面に固着され、上記両筒体を互いに連結する筒状ゴム弾性体とを備え、上記ゴム弾性体の外周面には、径方向に突出する凸部が全周に亘って形成されている一方、上記外筒体の内周面には、上記凸部の先端部形状と対応するように凹形状をなして該凸部先端部と係合する凹部が全周に亘って形成され、上記凸部の筒軸方向両側における上記ゴム弾性体の外周面には、筒軸方向から見て多角形状又は楕円形状をなす一対の弾性体側嵌合部が形成されている一方、上記凹部の筒軸方向両側における上記外筒体の内周面には、筒軸方向から見て該両弾性体側嵌合部の形状と対応するように多角形状又は楕円形状をなしかつ該両弾性体側嵌合部と径方向に所定量の隙間があくようにそれぞれ嵌合する一対の外筒体側嵌合部が形成されているものとする。この発明により、請求項１の発明と同様の作用効果を得ることができる。
【００２０】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。図１は、本発明の実施形態に係るシフトレバーブッシュ１が設けられたシフトレバーを示し、１１は、軸方向（上下方向）に２分割にされた一対のシフトレバー部材のうちのロア側シフトレバー部材であり、１２はアッパ側シフトレバー部材である。このロア側シフトレバー部材１１の上部には断面円形の軸部１１ａが形成されている一方、アッパ側シフトレバー部材１２の下部には、該ロア側シフトレバー部材１１の軸部１１ａの外周面を囲む円筒状の筒状部１２ａが形成されている。この軸部１１ａは、上端部を構成する小径部１１ｂと、該小径部１１ｂの下側に位置する大径部１１ｃとからなり、この小径部１１ｂはゴム部材１３を介して上記アッパ側シフトレバー部材１２の筒状部１２ａと連結されている一方、上記大径部１１ｃは上記シフトレバーブッシュ１を介して筒状部１２ａと連結されている。尚、上記アッパ側シフトレバー部材１２の上端部には、シフトノブ（図示せず）が螺合により取り付けられるねじ部１２ｂが形成されている。
【００２１】
上記シフトレバーブッシュ１は、図２〜図４に示すように、上記ロア側シフトレバー部材１１の軸部１１ａの大径部１１ｂに対して外嵌合により取付固定される内筒体２と、この内筒体２の外周面を囲むように該内筒体２の筒軸Ｘ（シフトレバー部材１１，１２軸と一致）と略同軸に配置され、上記アッパ側シフトレバー部材１２の筒状部１２ａに対して内嵌合により取付固定される金属製の外筒体３と、この両筒体２，３を互いに連結する筒状ゴム弾性体４とを備えている。上記内筒体２は、樹脂からなる外周側部材２ａと、この外周側部材２ａの内周側に配設されかつ金属からなる内周側部材２ｂとの２部材で構成され、この内周側部材２ｂが上記軸部１１ａの大径部１１ｂに対して外嵌合されるようになっている。上記外周側部材２ａの内周面と内周側部材２ｂの外周面とは、筒軸Ｘ方向から見て円形状をなしていて、インサート成形等により互いに筒軸Ｘ回りに相対回動できないように固着されている。また、内周側部材２ｂの筒軸Ｘ方向の長さは外周側部材２ａよりも大きく設定され、内周側部材２ｂの筒軸Ｘ方向両端部は、外周側部材２ａの筒軸Ｘ方向両端面よりもそれぞれ筒軸Ｘ方向に突出している。
【００２２】
上記外筒体３の内周面及びゴム弾性体４の外周面は、筒軸Ｘ方向から見て略正八角形状をなしていて、加硫成形等により互いに筒軸Ｘ回りに相対回動できないように固着されている。
【００２３】
そして、上記ゴム弾性体４の内周面の筒軸Ｘ方向略中央部には、径方向内側に突出する凸部４ａが全周に亘って形成され、この凸部４ａの先端面は、筒軸Ｘ方向から見て略正八角形状をなしている。この凸部４ａの筒軸Ｘ方向両側における上記ゴム弾性体４の内周面には、筒軸Ｘ方向から見て略正八角形状（多角形状）をなす一対の弾性体側嵌合部４ｂ，４ｂが形成されている。この各弾性体側嵌合部４ｂの肉厚（径方向）は全周に亘って略均一に設定されている。上記各弾性体側嵌合部４ｂと上記凸部４ａとの間には、径方向に凹となる凹溝部４ｃが形成され、この凹溝部４ｃの底面も筒軸Ｘ方向から見て略正八角形状をなし、上記凸部４ａの凹溝部４ｃ底面からの突出量は全周に亘って略一定に設定されている。また、上記凸部４ａの基端部の厚み（筒軸Ｘ方向）は先端部よりも小さく設定され、該先端部が筒軸Ｘ方向にたわみ易いようになされている。
【００２４】
一方、上記内筒体２の外周側部材２ａの外周面には、上記ゴム弾性体４内周面の凸部４ａの先端部形状と対応するように凹形状をなして該凸部４ａ先端部と係合する凹部２ｃが全周に亘って形成されている。つまり、この凹部２ｃの底面は、上記凸部４ａの先端面全周が略当接するように筒軸Ｘ方向から見て略正八角形状をなしており、凹部２ｃの幅（筒軸Ｘ方向）は凸部４ａ先端部の厚みと略同じに設定されている。上記凹部２ｃの筒軸Ｘ方向両側における上記内筒体２の外周側部材２ａの外周面には、上記ゴム弾性体４の両弾性体側嵌合部４ｂ，４ｂと径方向に所定量（全周に亘って略一定）の隙間があくようにそれぞれ嵌合する一対の内筒体側嵌合部２ｄ，２ｄが形成されている。つまり、この各内筒体側嵌合部２ｄも、上記各弾性体側嵌合部４ｂと同様に、筒軸Ｘ方向から見て略正八角形状をなしている。
【００２５】
上記内筒体２の内周側部材２ｂの筒軸Ｘ方向両端部には、上記ゴム弾性体４が内筒体２に対して筒軸Ｘ方向に所定量以上移動するのを規制する２つの規制部５，５がそれぞれ一体に設けられている。すなわち、この両規制部５，５は、内筒体２の内周側部材２ｂの筒軸Ｘ方向に延びた両端部を径方向にそれぞれ曲げることで内筒体２と一体形成されたものであり、各規制部５の外周縁部が、ゴム弾性体４の筒軸Ｘ方向両端面と所定間隔をあけて対向する位置にそれぞれ設けられている。上記内周側部材２ｂにおける筒軸Ｘ方向両端部の少なくとも一方の曲げは、外周側部材２ａと内周側部材２ｂとを固着すると共に、ゴム弾性体４の凸部４ａと外周側部材２ａの凹部２ｃとを係合しかつ両弾性体側嵌合部４ｂ，４ｂと両内筒体側嵌合部２ｄ，２ｄとをそれぞれ嵌合させた後に行う。尚、上記各規制部５は、ロア側シフトレバー部材１１（内筒体２）とアッパ側シフトレバー部材１２（外筒体３）とが相対的にこじれたときにアッパ側シフトレバー部材１２の筒状部１２ａ内面が当接しないように設けられており、その筒状部１２ａ内面が当接しなければ、各規制部５を径方向外側に延ばして外筒体３及びゴム弾性体４の両方の筒軸Ｘ方向両端面と対向するようにしてもよい。
【００２６】
したがって、上記実施形態では、シフトレバーの非操作時においては、シフトレバーブッシュ１の内筒体２とゴム弾性体４とが、剛性が低くて筒軸Ｘ方向にたわみ易い凸部４ａと凹部２ｃとが係合することで連結されているので、ロア側シフトレバー部材１１の軸部１１ａの振動（特に多く発生するロア側シフトレバー部材１１軸方向の振動）がアッパ側シフトレバー部材１２に伝達するのを有効に阻止することができ、防振効果を非常に高めることができる。
【００２７】
一方、シフトレバーのシフト操作やセレクト操作により、アッパ側シフトレバー部材１２が操作荷重を受けると、内筒体２と外筒体３とが相対的に筒軸Ｘ回りにねじられたり、凸部４ａの筒軸Ｘ方向略中央を通る径方向軸回りにこじられたりするが、このときのねじり特性については、筒軸Ｘ方向から見て略正八角形状をなす各弾性体側嵌合部４ｂと各内筒体側嵌合部２ｄとが径方向に所定量の隙間があくように嵌合されているので、その所定量の隙間に対応する角度だけ殆ど抵抗なくねじられるために初期は軟らかく、その後は弾性体側嵌合部４ｂと内筒体側嵌合部２ｄとが当接して硬くなる。しかも、ゴム弾性体４の各弾性体側嵌合部４ｂは周方向に変形し難いので、当接後はかなり硬くすることができる。また、こじり特性についても、上記所定量の隙間に対応する角度だけ殆ど抵抗なくこじられるために初期は軟らかく、その後は弾性体側嵌合部４ｂと内筒体側嵌合部２ｄとが当接して硬くなる。そして、ゴム弾性体４のゴムをより硬くすることで、ねじり特性とこじり特性との両方において弾性体側嵌合部４ｂと内筒体側嵌合部２ｄとの当接後にさらに硬くすることができる。一方、このようにゴムを硬くしても、凸部４ａの厚みをより小さくすれば防振性能は高いレベルに維持することができる。したがって、防振効果と操作フィーリングとを共に向上させることができる。
【００２８】
また、内筒体２の内周側部材２ｂの筒軸Ｘ方向両端部に、ゴム弾性体４が内筒体２に対して筒軸Ｘ方向に所定量以上移動するのを規制する２つの規制部５，５がそれぞれ一体に設けられているので、乗員がアッパ側シフトレバー部材１２を軸方向に引張ったり押し込んだりしたとしても、ゴム弾性体４の凸部４ａと内筒体２の外周側部材２ａの凹部２ｃとの係合が解除したり、凸部４ａが破断したりするようなことはない。
【００２９】
さらに、内筒体２が、樹脂製の外周側部材２ａと金属製の内周側部材２ｂとの２部材で構成されているので、凹部２ｃと各内筒体側嵌合部２ｄとを容易に形成することができると共に、インサート成形等により互いに筒軸Ｘ回りに相対回動できないように簡単に固着することができる。また、内周側部材２ｂを金属製とすることで、ロア側シフトレバー部材１１の軸部１１ａの大径部１１ｂに対して樹脂よりも強固に取付固定することができる。
【００３０】
尚、上記実施形態では、弾性体側嵌合部４ｂ及び内筒体側嵌合部２ｄを筒軸Ｘ方向から見て略正八角形状をなすようにしたが、多角形状であればどのような形状であってもよく、また、楕円形状であってもよい。この場合、外筒体３の内周面及びゴム弾性体４の外周面並びにゴム弾性体４の凸部４ａ先端面及び内筒体２の外周側部材２ａの凹部２ｃ底面は、弾性体側嵌合部４ｂ及び内筒体側嵌合部２ｄに対応させて多角形状や楕円形状にすればよい。
【００３１】
さらに、上記実施形態では、内筒体２を外周側部材２ａと内周側部材２ｂとの２部材で構成したが、金属や樹脂で一体形成したものであってもよい。そして、外筒体３を樹脂で構成してもよい。
【００３２】
また、上記実施形態では、両規制部５，５を内筒体２の内周側部材２ｂの筒軸Ｘ方向両端部に一体に設けたが、図５に示すように、一方の規制部５をスナップリング等で構成してロア側シフトレバー部材１１の軸部１１ａの大径部１１ｂ外周面に取付固定するようにしてもよく、図６に示すように、両規制部５，５をスナップリング等で構成して軸部１１ａの大径部１１ｂに取付固定するようにしてもい。そして、このように規制部５をスナップリング等で構成する場合には、その規制部５を内筒体２の外周側部材２ａ又は内周側部材２ｂの外周面に取付固定するようにしてもよい。
【００３３】
さらにまた、上記実施形態では、弾性体側嵌合部４ｂと内筒体側嵌合部２ｄとの隙間を全周に亘って略一定に設定したが、図７に示すように、径方向における互いに直交する２方向で異なるように設定してもよい。すなわち、同図のＡ方向における隙間δａを、Ａ方向と垂直なＢ方向における隙間δｂよりも大きく設定しておく。そして、例えばこのＡ方向をシフトレバーの操作方向のうちのシフト方向に、Ｂ方向をセレクト方向にそれぞれ設定すれば、セレクト方向はシフト方向よりも小さいこじり量で硬くすることができる。また、これとは逆にＡ方向をセレクト方向に、Ｂ方向をシフト方向にそれぞれ設定することもでき、乗員の好みに適合させることができる。
【００３４】
加えて、上記実施形態では、ゴム弾性体４の内周面に凸部４ａと各弾性体側嵌合部４ｂとを形成し、内筒体２の外周側部材２ａの外周面に凹部２ｃと内筒体側嵌合部２ｄとを形成したが、図８に示すように、内筒体２の外周面にゴム弾性体４を固着し、このゴム弾性体４の外周面の筒軸Ｘ方向中央部に、径方向外側に突出する凸部４ａを形成すると共に、この凸部４ａの筒軸Ｘ方向両側における上記ゴム弾性体４の外周面に、筒軸Ｘ方向から見て多角形状又は楕円形状をなす一対の弾性体側嵌合部４ｂ，４ｂを形成する一方、外筒体３の内周面に、上記凸部４ａの先端部形状と対応するように凹形状をなして該凸部先端部と係合する凹部３ａを形成すると共に、この凹部３ａの筒軸Ｘ方向両側における上記外筒体３の内周面に、筒軸Ｘ方向から見て該両弾性体側嵌合部４ｂ，４ｂと対応するように多角形状又は楕円形状をなしかつ該両弾性体側嵌合部４ｂ，４ｂと径方向に所定量の隙間があくようにそれぞれ嵌合する一対の外筒体側嵌合部３ｂ，３ｂを形成するようにしてもよい。この場合、内筒体２外周面のゴム弾性体４が固着された部分及びゴム弾性体４の内周面並びにゴム弾性体４の凸部４ａ先端面及び外筒体３の凹部３ａ底面は、弾性体側嵌合部４ｂ及び外筒体側嵌合部３ｂに対応させて多角形状や楕円形状にすればよい。
【００３５】
【発明の効果】
以上説明したように、本発明のシフトレバーブッシュによると、ゴム弾性体の内周面に、径方向に突出する凸部を形成する一方、内筒体の外周面に、この凸部と係合する凹部を形成し、上記凸部の筒軸方向両側における上記ゴム弾性体の内周面に、筒軸方向から見て多角形状又は楕円形状をなす一対の弾性体側嵌合部を形成し、上記内筒体の外周面に、筒軸方向から見て該両弾性体側嵌合部の形状と対応するように多角形状又は楕円形状をなしかつ該両弾性体側嵌合部と径方向に所定量の隙間があくようにそれぞれ嵌合する一対の内筒体側嵌合部を形成したことにより、筒軸方向に軟らかくして防振効果を高めることができると共に、ねじり特性及びこじり特性を、初期に軟らかくその後に硬くなるようにして操作フィーリングを向上させることができる。
【００３６】
また、ゴム弾性体の外周面に、径方向に突出する凸部を形成する一方、外筒体の内周面に、この凸部と係合する凹部を形成し、上記凸部の筒軸方向両側における上記ゴム弾性体の外周面に、筒軸方向から見て多角形状又は楕円形状をなす一対の弾性体側嵌合部を形成し、上記外筒体の内周面に、筒軸方向から見て該両弾性体側嵌合部と対応するように多角形状又は楕円形状をなしかつ該両弾性体側嵌合部と径方向に所定量の隙間があくようにそれぞれ嵌合する一対の外筒体側嵌合部を形成したことにより、上記と同様に、防振効果と操作フィーリングとを共に向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るシフトレバーブッシュが設けられたシフトレバーの一部を示す縦断面図である。
【図２】図１のシフトレバーのシフトレバーブッシュが設けられた部分の拡大縦断面図である。
【図３】図２のIII −III 線断面図である。
【図４】図２のIV−IV線断面図である。
【図５】規制部の変形例を示す図２相当図である。
【図６】規制部のさらに別の変形例を示す図２相当図である。
【図７】弾性体側嵌合部と内筒体側嵌合部との隙間を、径方向における互いに直交する２方向で異ならせた変形例を示す図４相当図である。
【図８】シフトレバーブッシュの他の形態を示す図２相当図である。
【符号の説明】
１シフトレバーブッシュ
２内筒体
２ａ外周側部材
２ｂ内周側部材
２ｃ凹部
２ｄ内筒体側嵌合部
３外筒体
３ａ凹部
３ｂ外筒体側嵌合部
４ゴム弾性体
４ａ凸部
４ｂ弾性体側嵌合部
５規制部
１１ロア側シフトレバー部材
１１ａ軸部
１２アッパ側シフトレバー部材
１２ａ筒状部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technical field related to a shift lever bush provided between a shaft portion formed on one of a pair of shift lever members divided in two in the axial direction and a cylindrical portion formed on the other. Belongs.
[0002]
[Prior art]
Conventionally, as shown in, for example, Japanese Utility Model Laid-Open No. 4-124520, it is formed on one (transmission side) of a pair of shift lever members that are divided into two in the axial direction (substantially coincides with the vertical direction). It is known that a shift lever bush is provided between the shaft part and the cylindrical part formed on the other side (shift knob side) to prevent transmission side vibration from being transmitted to the shift knob side. ing. Such a shift lever bush is substantially the same as the inner cylindrical body attached to the shaft portion of one shift lever member by outer fitting, and the inner cylindrical body shaft so as to surround the outer peripheral surface of the inner cylindrical body. An outer cylindrical body that is coaxially disposed and is attached to the cylindrical portion of the other shift lever member by inner fitting, and is disposed between the inner cylindrical body and the outer cylindrical body, and connects the two cylindrical bodies to each other. And a cylindrical rubber elastic body.
[0003]
And in the thing of the said gazette, durability, operativity, by providing the stopper mechanism which restricts the displacement of the diameter direction between the inner cylinder body and the outer cylinder body, the twist direction, and the axial direction between them. It has been proposed to improve damping properties against vibration.
[0004]
[Problems to be solved by the invention]
By the way, in the shift lever bush, since the vibration direction of the shift lever member on the transmission side is mainly the axial direction of the shift lever member (the cylinder axis direction of the inner cylinder), it is soft in the cylinder axis direction and has a vibration proof effect. Operation with a request to increase the height, torsion (rotation around the cylinder axis) characteristics and twisting (rotation around the radial axis perpendicular to the cylinder axis) characteristics are set to be soft initially and then hard There is a demand to improve the feeling.
[0005]
However, in the above proposed example (Japanese Utility Model Laid-Open No. 4-124520), the displacement limitation in the torsional direction between the inner cylindrical body and the outer cylindrical body is limited in one of the annular groove portions opened in the cylindrical axial end surface of the rubber elastic body. This is performed by abutment between a concave portion formed on the peripheral surface and a convex portion which is formed on the annular stopper member fitted in the groove portion and can be engaged at a predetermined interval. Although the torsional characteristics are soft at the initial stage due to the predetermined interval, the convex contact surface of the concave portion of the rubber elastic body is easily deformed in the circumferential direction. Therefore, the deformation cannot be so hard after contact.
[0006]
Further, in the above proposed example, the rubber elastic body can be softened to some extent in the cylinder axis direction by reducing the length in the cylinder axis direction of the portion connecting the inner cylinder body and the outer cylinder body of the rubber elastic body. Is fixed to the inner cylinder and the outer cylinder, so that a sufficient anti-vibration effect cannot be obtained.
[0007]
The present invention has been made in view of such a point, and an object of the present invention is to improve the structure of the shift lever bush as described above, thereby improving the vibration isolation effect and the operation feeling. The goal is to improve it.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a convex portion projecting in the radial direction is formed on the inner peripheral surface of the rubber elastic body, and the convex portion is engaged with the outer peripheral surface of the inner cylindrical body. One of forming a pair of elastic body side fitting portions that form a polygonal shape or an elliptical shape when viewed from the cylindrical axis direction on the inner peripheral surface of the rubber elastic body on both sides in the cylindrical axis direction of the convex portion. A pair of inner cylinder side fitting portions are formed on the outer peripheral surface of the inner cylinder body so as to be fitted with both the elastic body side fitting portions so as to have a predetermined amount of gap in the radial direction.
[0009]
Specifically, in the present invention, a shift lever provided between a shaft portion formed in one of a pair of shift lever members divided in two in the axial direction and a cylindrical portion formed in the other. For Bush.
[0010]
And the inner cylinder that is attached by external fitting to the shaft portion of the one shift lever member, and is arranged substantially coaxially with the cylinder axis of the inner cylinder so as to surround the outer peripheral surface of the inner cylinder, An outer cylinder attached to the cylindrical portion of the other shift lever member by inner fitting, and a cylindrical rubber elastic body fixed to the inner peripheral surface of the outer cylinder and connecting the two cylinders to each other. A convex portion projecting in the radial direction is formed over the entire circumference on the inner peripheral surface of the rubber elastic body, and the tip shape of the convex portion is formed on the outer peripheral surface of the inner cylindrical body. A concave portion that has a concave shape and engages with the tip of the convex portion is formed over the entire circumference, and a cylindrical shaft is provided on the inner peripheral surface of the rubber elastic body on both sides of the convex portion in the cylindrical axis direction. A pair of elastic body-side fitting portions having a polygonal shape or an elliptical shape as viewed from the direction are formed, while the cylindrical direction of the concave portion is The outer peripheral surface of the inner cylindrical body on both sides, without the polygonal shape or an elliptical shape so as to correspond to the both the elastic body-side fitting portion as viewed from the cylinder axis direction and Tokoro to both said elastic body-side fitting part and the radially It is assumed that a pair of inner cylinder side fitting portions that are respectively fitted so as to have a fixed gap are formed.
[0011]
With the above configuration, the convex portion is formed in a shape that is easy to bend in the cylinder axis direction, so that it can be extremely soft in the cylinder axis direction, and the inner cylinder body and the rubber elastic body when the shift lever is not operated. Are connected only by the engagement between the convex portion and the concave portion, so that transmission side vibration is less likely to be transmitted to the shift knob side than when the rubber elastic body is fixed to both the inner cylinder body and the outer cylinder body. It is possible to improve the anti-vibration effect. On the other hand, if the shift lever member on the shift knob side receives an operation load due to shift operation or select operation of the shift lever, the inner cylinder body and the outer cylinder body are relatively twisted around the cylinder axis or around the radial axis. The torsional characteristics at this time are the polygonal or elliptical elastic side fitting part and the polygonal or elliptical inner cylinder side corresponding to both elastic side fitting parts. Since the fitting part is fitted so that there is a predetermined amount of gap in the radial direction, it is soft at the initial stage because it is twisted with almost no resistance corresponding to the predetermined amount of gap, and then the elastic body side fitting The portion and the inner cylinder side fitting portion come into contact with each other and become hard. In addition, since the elastic body side fitting portion of the rubber elastic body is not easily deformed in the circumferential direction, it can be sufficiently hardened after contact. Also, the twisting characteristics are soft at the initial stage because they are twisted with almost no resistance corresponding to the predetermined amount of gap, and thereafter, the elastic body side fitting part and the inner cylinder side fitting part come into contact with each other and become hard. Therefore, the operation feeling can be improved with certainty.
[0012]
According to a second aspect of the present invention, in the first aspect of the present invention, the inner cylinder and the rubber elastic body relatively move in the cylinder axis direction by a predetermined amount or more relative to the opposite ends of the rubber elastic body in the cylinder axis direction. It is assumed that two restricting portions for restricting the operation are provided.
[0013]
As a result, even if the occupant pulls or pushes the shift lever member on the shift knob side in the axial direction, the cylinder axial end surface of the rubber elastic body comes into contact with the restricting portion and the cylinder of the inner cylinder and the rubber elastic body Since the relative movement in the axial direction is restricted, the engagement between the convex portion on the inner peripheral surface of the rubber elastic body and the concave portion on the outer peripheral surface of the inner cylindrical body is not released or the convex portion is not broken. Therefore, reliability and durability can be improved while enhancing the vibration isolation effect.
[0014]
According to a third aspect of the present invention, in the second aspect of the present invention, the restricting portion is integrally provided on the outer peripheral surface of the inner cylindrical body. By doing so, relative movement in the axial direction between the inner cylinder and the outer cylinder can be restricted with a simple configuration without increasing the number of parts.
[0015]
In the invention of claim 4, in the invention of claim 1, 2, or 3, the inner cylinder is formed on the outer peripheral side member in which the inner cylinder side fitting portion and the recess are formed, and on the inner peripheral surface of the outer peripheral side member. Suppose that it is comprised by two members with the inner peripheral side member fixed and externally fitting with respect to the axial part of a shift lever member. Thus, if the outer peripheral side member is, for example, a resin member, the concave portion and the inner cylinder side fitting portion can be easily formed, and the manufacturing cost can be reduced.
[0016]
In the invention of claim 5, in the invention of claim 1, 2, 3 or 4, the gap between the elastic body side fitting portion and the inner cylinder side fitting portion is set to be different in two directions orthogonal to each other in the radial direction. It is assumed that
[0017]
As a result, if the two directions orthogonal to each other are set to the shift direction and the select direction, for example, the operation direction of the shift lever, the twisting characteristics in both directions can be made different from each other, and the operation suited to the passenger's preference Feeling can be realized.
[0018]
In the invention of claim 6, the shift lever bush provided between the shaft portion formed on one of the pair of shift lever members divided in the axial direction and the cylindrical portion formed on the other is provided. set to target.
[0019]
And the inner cylinder that is attached by external fitting to the shaft portion of the one shift lever member, and is arranged substantially coaxially with the cylinder axis of the inner cylinder so as to surround the outer peripheral surface of the inner cylinder, An outer cylinder that is attached to the cylindrical portion of the other shift lever member by internal fitting; and a cylindrical rubber elastic body that is fixed to the outer peripheral surface of the inner cylinder and connects the two cylinders to each other. On the outer peripheral surface of the rubber elastic body, a convex portion protruding in the radial direction is formed over the entire circumference, while the inner peripheral surface of the outer cylindrical body corresponds to the tip shape of the convex portion. A concave portion that forms a concave shape and engages with the tip of the convex portion is formed over the entire circumference, and the outer peripheral surface of the rubber elastic body on both sides in the cylindrical axis direction of the convex portion is formed from the cylindrical axis direction. A pair of elastic body-side fitting portions that are polygonal or elliptical when viewed are formed, while the cylindrical direction of the recess is The inner peripheral surface of the outer cylindrical member on both sides, without the polygonal shape or an elliptical shape so as to correspond to the both the elastic body-side fitting part of the shape as viewed from the cylinder axis and both said elastic body-side fitting unit and the diameter It is assumed that a pair of outer cylinder side fitting portions that are respectively fitted so as to have a predetermined amount of gap in the direction are formed. According to the present invention, the same effect as that attained by the 1st aspect can be attained.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a shift lever provided with a shift lever bush 1 according to an embodiment of the present invention, and 11 is a lower side shift of a pair of shift lever members divided in the axial direction (vertical direction). Reference numeral 12 denotes a lever member, and reference numeral 12 denotes an upper shift lever member. A shaft portion 11 a having a circular cross section is formed on the upper portion of the lower side shift lever member 11, while an outer peripheral surface of the shaft portion 11 a of the lower side shift lever member 11 is formed on the lower portion of the upper side shift lever member 12. An encircling cylindrical portion 12a is formed. The shaft portion 11a includes a small-diameter portion 11b constituting the upper end portion and a large-diameter portion 11c positioned below the small-diameter portion 11b. The small-diameter portion 11b is connected to the upper side shift lever via the rubber member 13. The large diameter portion 11 c is connected to the cylindrical portion 12 a via the shift lever bush 1 while being connected to the cylindrical portion 12 a of the member 12. A screw portion 12b to which a shift knob (not shown) is attached by screwing is formed at the upper end portion of the upper shift lever member 12.
[0021]
As shown in FIGS. 2 to 4, the shift lever bush 1 is attached and fixed to the large diameter portion 11 b of the shaft portion 11 a of the lower shift lever member 11 by external fitting, The cylindrical portion of the upper side shift lever member 12 is disposed substantially coaxially with the cylinder axis X of the inner cylinder 2 so as to surround the outer peripheral surface of the inner cylinder 2 (coincident with the shift lever members 11 and 12). A metal outer cylindrical body 3 that is fixedly attached to 12a by internal fitting and a cylindrical rubber elastic body 4 that couples the cylindrical bodies 2 and 3 to each other are provided. The inner cylinder 2 is composed of two members, an outer peripheral member 2a made of resin and an inner peripheral member 2b made of metal and disposed on the inner peripheral side of the outer peripheral member 2a. The member 2b is externally fitted to the large diameter portion 11b of the shaft portion 11a. The outer peripheral surface of the outer peripheral side member 2a and the outer peripheral surface of the inner peripheral side member 2b are circular when viewed from the direction of the cylinder axis X so that they cannot rotate relative to each other around the cylinder axis X by insert molding or the like. It is fixed to. Further, the length of the inner peripheral side member 2b in the cylinder axis X direction is set larger than that of the outer peripheral side member 2a, and both ends of the inner peripheral side member 2b in the cylinder axis X direction are both ends of the outer peripheral side member 2a in the cylinder axis X direction. Each protrudes in the cylinder axis X direction from the surface.
[0022]
The inner peripheral surface of the outer cylindrical body 3 and the outer peripheral surface of the rubber elastic body 4 have a substantially regular octagonal shape when viewed from the direction of the cylindrical axis X, and cannot rotate relative to each other around the cylindrical axis X by vulcanization molding or the like. So that it is fixed.
[0023]
And the convex part 4a which protrudes to a radial inside is formed in the cylindrical-axis X direction approximate center part of the inner peripheral surface of the said rubber elastic body 4, and the front end surface of this convex part 4a is a cylinder. It has a substantially regular octagonal shape when viewed from the axis X direction. A pair of elastic body-side fitting portions 4b, 4b having a substantially regular octagonal shape (polygonal shape) as viewed from the cylinder axis X direction is formed on the inner peripheral surface of the rubber elastic body 4 on both sides of the projection 4a in the cylinder axis X direction. Is formed. The thickness (diameter direction) of each elastic body side fitting portion 4b is set substantially uniformly over the entire circumference. Between each elastic body side fitting part 4b and the said convex part 4a, the concave groove part 4c which becomes concave in radial direction is formed, and the bottom face of this concave groove part 4c is also substantially regular octagonal shape seeing from the cylinder axis X direction. The protruding amount of the convex portion 4a from the bottom surface of the concave groove portion 4c is set to be substantially constant over the entire circumference. Further, the thickness (in the cylinder axis X direction) of the base end portion of the convex portion 4a is set to be smaller than that of the distal end portion so that the distal end portion is easily bent in the cylinder axis X direction.
[0024]
On the other hand, on the outer peripheral surface of the outer peripheral side member 2a of the inner cylindrical body 2, a concave shape is formed so as to correspond to the front end shape of the convex portion 4a on the inner peripheral surface of the rubber elastic body 4. Is formed over the entire circumference. That is, the bottom surface of the concave portion 2c has a substantially regular octagonal shape when viewed from the cylinder axis X direction so that the entire circumference of the tip surface of the convex portion 4a substantially contacts, and the width of the concave portion 2c (in the cylinder axis X direction). Is set to be substantially the same as the thickness of the tip of the convex portion 4a. On the outer peripheral surface of the outer peripheral side member 2a of the inner cylindrical body 2 on both sides of the concave portion 2c in the cylinder axis X direction, the rubber elastic body 4 has a predetermined amount (total circumference) with the elastic body side fitting portions 4b, 4b. A pair of inner cylinder side fitting portions 2d and 2d are formed so as to be fitted so as to have a substantially constant gap. That is, each inner cylinder side fitting portion 2d has a substantially regular octagonal shape as seen from the cylinder axis X direction, similarly to each elastic body side fitting portion 4b.
[0025]
Two end portions of the inner peripheral member 2b of the inner cylinder 2 that restrict the movement of the rubber elastic body 4 in the cylinder axis X direction by a predetermined amount or more with respect to the inner cylinder 2 are provided at both ends. The regulation parts 5 and 5 are each provided integrally. That is, both the restricting portions 5 and 5 are integrally formed with the inner cylinder 2 by bending both end portions extending in the cylinder axis X direction of the inner peripheral member 2b of the inner cylinder 2 in the radial direction. In addition, the outer peripheral edge portion of each restricting portion 5 is provided at a position facing the both end surfaces of the rubber elastic body 4 in the cylinder axis X direction with a predetermined interval. The bending of at least one of the both ends of the inner peripheral side member 2b in the cylinder axis X direction fixes the outer peripheral side member 2a and the inner peripheral side member 2b as well as the convex portions 4a of the rubber elastic body 4 and the outer peripheral side member 2a. This is performed after engaging the recess 2c and fitting both the elastic body side fitting parts 4b, 4b and both the inner cylinder side fitting parts 2d, 2d. Each restricting portion 5 is configured so that when the lower side shift lever member 11 (inner cylinder 2) and the upper side shift lever member 12 (outer cylinder 3) are relatively twisted, the upper side shift lever member 12 The inner surface of the cylindrical portion 12a is provided so as not to contact. If the inner surface of the cylindrical portion 12a does not contact, both the outer cylindrical body 3 and the rubber elastic body 4 are extended by extending each regulating portion 5 radially outward. You may make it oppose both the cylinder axis X direction both end surfaces.
[0026]
Therefore, in the above embodiment, when the shift lever is not operated, the inner cylinder 2 and the rubber elastic body 4 of the shift lever bush 1 have a low rigidity and are easy to bend in the cylinder axis X direction. Are coupled by engaging with each other, so that vibration of the shaft portion 11a of the lower shift lever member 11 (particularly vibration in the axial direction of the lower shift lever member 11) is transmitted to the upper shift lever member 12. Can be effectively prevented, and the anti-vibration effect can be greatly enhanced.
[0027]
On the other hand, when the upper shift lever member 12 receives an operation load due to a shift operation or a select operation of the shift lever, the inner cylinder 2 and the outer cylinder 3 are relatively twisted around the cylinder axis X or protruded. 4a of the elastic body side fitting portion 4b having a substantially regular octagonal shape when viewed from the cylinder axis X direction. Since each inner cylinder side fitting portion 2d is fitted so as to have a predetermined amount of gap in the radial direction, only the angle corresponding to the predetermined amount of gap is twisted with almost no resistance, so the initial is soft, The elastic body side fitting portion 4b and the inner cylinder side fitting portion 2d come into contact with each other and become hard. In addition, since each elastic body side fitting portion 4b of the rubber elastic body 4 is not easily deformed in the circumferential direction, it can be made quite hard after contact. Also, the twisting characteristic is soft at the initial stage because it is twisted with almost no resistance corresponding to the predetermined amount of gap, and thereafter, the elastic body side fitting portion 4b and the inner cylinder side fitting portion 2d are in contact and hard. Become. By making the rubber of the rubber elastic body 4 harder, it can be further hardened after the contact between the elastic body side fitting portion 4b and the inner cylinder side fitting portion 2d in both torsional characteristics and twisting characteristics. On the other hand, even if the rubber is hardened in this way, the vibration isolation performance can be maintained at a high level if the thickness of the convex portion 4a is further reduced. Therefore, both the vibration isolation effect and the operation feeling can be improved.
[0028]
In addition, two regulations that restrict the rubber elastic body 4 from moving in the cylinder axis X direction by a predetermined amount or more with respect to the inner cylinder 2 at both ends of the inner circumferential side member 2b of the inner cylinder 2 in the cylinder axis X direction. Since the portions 5 and 5 are integrally provided, even if the occupant pulls or pushes the upper shift lever member 12 in the axial direction, the convex portion 4a of the rubber elastic body 4 and the outer peripheral side of the inner cylindrical body 2 are provided. The engagement of the member 2a with the concave portion 2c is not released, and the convex portion 4a is not broken.
[0029]
Furthermore, since the inner cylinder 2 is composed of two members, a resin outer peripheral member 2a and a metal inner peripheral member 2b, the recess 2c and each inner cylinder side fitting portion 2d can be easily formed. In addition to being able to be formed, they can be easily fixed so that they cannot rotate relative to each other around the cylinder axis X by insert molding or the like. Further, by making the inner peripheral side member 2b made of metal, it can be fixedly attached to the large diameter portion 11b of the shaft portion 11a of the lower shift lever member 11 more firmly than the resin.
[0030]
In the above embodiment, the elastic body side fitting portion 4b and the inner cylinder side fitting portion 2d are formed in a substantially regular octagonal shape when viewed from the cylinder axis X direction. It may also be oval. In this case, the inner peripheral surface of the outer cylindrical body 3, the outer peripheral surface of the rubber elastic body 4, the tip surface of the convex portion 4a of the rubber elastic body 4, and the bottom surface of the concave portion 2c of the outer peripheral side member 2a of the inner cylindrical body 2 are fitted on the elastic body side. A polygonal shape or an elliptical shape may be formed in correspondence with the portion 4b and the inner cylinder side fitting portion 2d.
[0031]
Furthermore, in the said embodiment, although the inner cylinder 2 was comprised by two members, the outer peripheral side member 2a and the inner peripheral side member 2b, it may be integrally formed with the metal and resin. And you may comprise the outer cylinder 3 with resin.
[0032]
Moreover, in the said embodiment, although both the regulation parts 5 and 5 were integrally provided in the cylinder-axis X direction both ends of the inner peripheral side member 2b of the inner cylinder 2, as shown in FIG. May be configured to be fixed to the outer peripheral surface of the large diameter portion 11b of the shaft portion 11a of the lower shift lever member 11 by snap rings or the like, and as shown in FIG. It may be configured by a ring or the like and fixed to the large diameter portion 11b of the shaft portion 11a. When the restricting portion 5 is constituted by a snap ring or the like in this way, the restricting portion 5 may be attached and fixed to the outer peripheral surface of the outer peripheral side member 2a or the inner peripheral side member 2b of the inner cylindrical body 2. Good.
[0033]
Furthermore, in the above embodiment, the gap between the elastic body side fitting portion 4b and the inner cylinder side fitting portion 2d is set to be substantially constant over the entire circumference, but as shown in FIG. 7, they are orthogonal to each other in the radial direction. You may set so that it may differ in two directions. That is, the gap δa in the A direction in the figure is set larger than the gap δb in the B direction perpendicular to the A direction. For example, if the A direction is set as the shift direction of the operation direction of the shift lever and the B direction is set as the select direction, the select direction can be hardened with a smaller amount of twist than the shift direction. On the contrary, the A direction can be set as the select direction and the B direction can be set as the shift direction, respectively, which can be adapted to the passenger's preference.
[0034]
In addition, in the said embodiment, the convex part 4a and each elastic body side fitting part 4b are formed in the internal peripheral surface of the rubber elastic body 4, and the recessed part 2c and an inner side are formed in the outer peripheral surface of the outer peripheral side member 2a of the inner cylinder 2. As shown in FIG. 8, the rubber elastic body 4 is fixed to the outer peripheral surface of the inner cylindrical body 2, and the central portion in the cylinder axis X direction of the outer peripheral surface of the rubber elastic body 4 is formed. Further, a convex portion 4a protruding radially outward is formed, and a polygonal shape or an elliptical shape as viewed from the cylindrical axis X direction is formed on the outer peripheral surface of the rubber elastic body 4 on both sides of the convex portion 4a in the cylindrical axis X direction. A pair of elastic body side fitting portions 4b, 4b are formed, and a concave shape is formed on the inner peripheral surface of the outer cylindrical body 3 so as to correspond to the shape of the tip portion of the convex portion 4a. to form a recess 3a which engages the inner peripheral surface of the outer cylindrical body 3 in the tube axis X direction on both sides of the recess 3a, or tube axis X direction Both said elastic body-side fitting portions 4b, 4b and form a polygonal shape or an elliptical shape so as to correspond and the two elastic side fitting portions 4b, respectively, as in 4b radially drilled a predetermined amount of clearance fit look You may make it form a pair of outer cylinder body side fitting part 3b, 3b to do. In this case, the portion of the outer peripheral surface of the inner cylindrical body 2 to which the rubber elastic body 4 is fixed, the inner peripheral surface of the rubber elastic body 4, the front end surface of the convex portion 4a of the rubber elastic body 4, and the bottom surface of the concave portion 3a of the outer cylindrical body 3 are A polygonal shape or an elliptical shape may be used corresponding to the elastic body side fitting portion 4b and the outer cylinder side fitting portion 3b.
[0035]
【The invention's effect】
As described above, according to the shift lever bush of the present invention, the convex portion protruding in the radial direction is formed on the inner peripheral surface of the rubber elastic body, while the convex portion is engaged with the outer peripheral surface of the inner cylindrical body. Forming a concave portion, and forming a pair of elastic body side fitting portions having a polygonal shape or an elliptical shape when viewed from the cylindrical axis direction on the inner peripheral surface of the rubber elastic body on both sides in the cylindrical axis direction of the convex portion, the outer peripheral surface of the inner cylinder, forms a polygonal shape or an elliptical shape so as to correspond to the both the elastic body-side fitting part of the shape as viewed from the tube axis direction and a predetermined amount of the two elastic side fitting portion and the radially By forming a pair of inner cylinder side fitting parts that fit each other so that there is a gap, it is possible to soften in the cylinder axis direction and enhance the vibration isolation effect, and torsional and twisting characteristics to be soft initially After that, it becomes harder and improves the operational feeling. Door can be.
[0036]
Moreover, while forming the convex part which protrudes in a radial direction on the outer peripheral surface of a rubber elastic body, the recessed part engaged with this convex part is formed in the inner peripheral surface of an outer cylinder, and the cylinder axial direction of the said convex part A pair of elastic body side fitting portions having a polygonal shape or an elliptical shape as viewed from the cylinder axis direction are formed on the outer peripheral surface of the rubber elastic body on both sides, and the inner peripheral surface of the outer cylinder body is viewed from the cylinder axis direction. fitting a pair of outer cylinder side to each fitted so that a gap is drilled polygonal or without an oval shape and the both the elastic body-side fitting unit and the predetermined amount in the radial direction so as to correspond with the both the elastic body-side fitting portion Te By forming the joint portion, it is possible to improve both the anti-vibration effect and the operation feeling as described above.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a part of a shift lever provided with a shift lever bush according to an embodiment of the present invention.
2 is an enlarged vertical cross-sectional view of a portion provided with a shift lever bush of the shift lever of FIG. 1;
3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a view corresponding to FIG. 2 showing a modification of the restricting portion.
FIG. 6 is a view corresponding to FIG. 2 showing still another modification of the restricting portion.
FIG. 7 is a view corresponding to FIG. 4 showing a modification in which the gap between the elastic body side fitting portion and the inner cylinder side fitting portion is different in two directions orthogonal to each other in the radial direction.
FIG. 8 is a view corresponding to FIG. 2 and showing another form of the shift lever bush.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shift lever bush 2 Inner cylinder 2a Outer peripheral side member 2b Inner peripheral side member 2c Recessed part 2d Inner cylindrical body side fitting part 3 Outer cylindrical body 3a Recessed part 3b Outer cylindrical body side fitting part 4 Rubber elastic body 4a Convex part 4b Elastic body side fitting Joint part 5 Restriction part 11 Lower side shift lever member 11a Shaft part 12 Upper side shift lever member 12a Cylindrical part

Claims

A shift lever bush provided between a shaft portion formed on one of a pair of shift lever members divided in two in the axial direction and a cylindrical portion formed on the other,
An inner cylinder attached by external fitting to the shaft portion of the one shift lever member;
An outer cylinder that is disposed substantially coaxially with the cylinder axis of the inner cylinder so as to surround the outer peripheral surface of the inner cylinder, and is attached by inner fitting to the cylindrical portion of the other shift lever member;
A cylindrical rubber elastic body fixed to the inner peripheral surface of the outer cylinder and connecting the cylinders to each other;
On the inner peripheral surface of the rubber elastic body, convex portions projecting in the radial direction are formed over the entire circumference, whereas the outer peripheral surface of the inner cylindrical body corresponds to the tip shape of the convex portion. A concave portion that is formed into a concave shape and engages with the tip of the convex portion is formed over the entire circumference,
On the inner peripheral surface of the rubber elastic body on both sides in the cylinder axis direction of the convex part, a pair of elastic body side fitting parts having a polygonal shape or an elliptical shape as viewed from the cylinder axis direction are formed. The outer peripheral surface of the inner cylindrical body on both sides in the cylinder axis direction has a polygonal shape or an elliptical shape so as to correspond to the both elastic body side fitting parts when viewed from the cylinder axis direction, and the diameters of both the elastic body side fitting parts A shift lever bush, wherein a pair of inner cylinder side fitting portions that are respectively fitted so as to have a predetermined amount of gap in the direction are formed.

The shift lever bush according to claim 1,
Two restricting portions for restricting the relative movement of the inner cylindrical body and the rubber elastic body in the cylinder axis direction by a predetermined amount or more are respectively provided at positions facing both end faces in the cylinder axis direction of the rubber elastic body. A shift lever bush characterized by

The shift lever bush according to claim 2,
The shift lever bush is characterized in that the restricting portion is integrally provided on the outer peripheral surface of the inner cylindrical body.

The shift lever bush according to claim 1, 2, or 3,
The inner cylinder is an inner member which is fixed to the inner peripheral surface of the outer peripheral side member formed with the inner cylindrical body side fitting portion and the concave portion, and is externally fitted to the shaft portion of the shift lever member. A shift lever bush comprising two members including a peripheral member.

The shift lever bush according to claim 1, 2, 3 or 4,
A shift lever bush, wherein a gap between the elastic body side fitting portion and the inner cylinder side fitting portion is set to be different in two directions orthogonal to each other in the radial direction.

A shift lever bush provided between a shaft portion formed on one of a pair of shift lever members divided in two in the axial direction and a cylindrical portion formed on the other,
An inner cylinder attached by external fitting to the shaft portion of the one shift lever member;
An outer cylinder that is disposed substantially coaxially with the cylinder axis of the inner cylinder so as to surround the outer peripheral surface of the inner cylinder, and is attached by inner fitting to the cylindrical portion of the other shift lever member;
A cylindrical rubber elastic body fixed to the outer peripheral surface of the inner cylinder and connecting the two cylinders to each other;
On the outer peripheral surface of the rubber elastic body, a convex portion protruding in the radial direction is formed over the entire circumference, while the inner peripheral surface of the outer cylinder body corresponds to the shape of the tip of the convex portion. A concave portion that is formed into a concave shape and engages with the tip of the convex portion is formed over the entire circumference,
On the outer peripheral surface of the rubber elastic body on both sides in the cylinder axis direction of the convex portion, a pair of elastic body side fitting portions having a polygonal shape or an elliptical shape as viewed from the cylinder axis direction are formed, while the cylinder of the concave portion is formed. The inner peripheral surface of the outer cylindrical body on both sides in the axial direction has a polygonal shape or an elliptical shape so as to correspond to the both elastic body side fitting portions when viewed from the cylindrical axis direction, and the diameters of both the elastic body side fitting portions. A shift lever bush, wherein a pair of outer cylinder side fitting portions are formed to be fitted so that a predetermined amount of gap is left in the direction.