JP3837229B2

JP3837229B2 - Rear wheel support and drive system for motorcycles

Info

Publication number: JP3837229B2
Application number: JP06892898A
Authority: JP
Inventors: 裕之川崎; 明夫河野
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1998-03-18
Filing date: 1998-03-18
Publication date: 2006-10-25
Anticipated expiration: 2018-03-18
Also published as: JPH11263271A; CN1229041A; ID22250A; BR9901019A; CN1082472C

Description

【０００１】
【発明の属する技術分野】
本発明は，自動二輪車における後輪の支持及び駆動装置，特に，リヤフォークの左右一対のフォーク脚に両端を支持される後車軸の外周に，一方のフォーク脚に支持される筒軸を嵌合し，この筒軸により，動力源からチエン駆動される駆動盤を回転自在に装着し，更に後車軸には，駆動盤と軸方向抜き差し可能に連結される後輪のハブと，このハブと他方のフォーク脚との間に，駆動盤に対するハブの軸方向連結深さより長い側部間隔筒を介裝したものゝ改良に関する。
【０００２】
【従来の技術】
従来のかゝる後輪の支持及び駆動装置を図８に示す。同図において，２Ｌ，２Ｒは自動二輪車のリヤフォーク２を構成する左右一対のフォーク脚で，これらの後端部に，車軸孔５を貫通する後車軸１１の両端部が緊締，支持される。この後車軸１１の中央部で後輪Ｗｒのハブ１４が，中央部間隔筒１６を挟んで並ぶ左右一対のボールベアリング１９，２０を介して支承され，このハブ１４の左側に，後車軸１１に貫通される筒軸０１２が配置され，ハブ１４の右側に，後車軸１１に貫通されるブレーキパネル１５及び側部間隔筒１８が配置される。
【０００３】
筒軸０１２の外周には，左側面にスプロケット２１をボルト２２で固着した駆動盤１３がボールベアリング２３を介して装着される。その際，上記ボールベアリング２３のアウタレース２３ｏは駆動盤部材に軽圧入され，そのインナレース２３ｉは，筒軸０１２に嵌挿されて左側フォーク脚２Ｌの内側面に当接する挟持筒１７と，筒軸０１２に形成されたフランジ０１２ａとで挟持される。駆動盤１３及びハブ１４の相対向面には，複数の伝動突起２４及び係合凹部２５がそれぞれ形成されており，これらはダンパゴム２６を介して互いに軸方向抜き差し可能に嵌合される。
【０００４】
筒軸０１２は，その左端部を左側フォーク脚２Ｌの外側方まで突出させており，その突出端部にロックナット３０を螺合，緊締することにより，筒軸０１２はインナレース２３ｉと共に左側フォーク脚２Ｌに固定，支持される。後車軸１１は，一端に六角頭部１１ａ，他端にねじ軸部１１ｂを有するボルトで構成されており，その頭部１１ａを筒軸０１２の外端に当接させ，先端のねじ軸部１１ｂにセルフナット３４を螺合，緊締することにより，両フォーク脚２Ｌ，２Ｒに固定，支持される。
【０００５】
尚，３５は，エンジン（図示せず）から駆動されてスプロケット２１を駆動すチェン，７はそのチェン３５の張り具合を調整するチェン調整ボルトである。
【０００６】
而して，後輪Ｗｒ，筒軸０１２，駆動盤１３，挟持筒１７及びブレーキパネル１５により後輪系組立体０２８が構成され，この組立体０２８の横幅Ｌ₁，即ち筒軸０１２及びブレーキパネル１５の各外端面間の距離は，両フォーク脚２Ｌ，２Ｒの内側面間の距離Ｌ₂より小さく設定される。また側部間隔筒１８の長さＬ₃は，駆動盤１３及びハブ１４の嵌合深さＬ₄より大きく設定される。
【０００７】
したがって，自動二輪車の組立てに当たっては，予め後輪系組立体０２８を組立て，これを両フォーク脚２Ｌ，２Ｒ間に挿入することができる。そしてこの組立体０２８を左方へ移動しながら筒軸０１２を左側フォーク脚２Ｌの車軸孔５に挿入して，その外方に突出させ，その突出端部にロックナット３０を螺合する。次いで，ブレーキパネル１５と右側フォーク脚２Ｒとの間に側部間隔筒１８を挿入してから，後車軸１１を筒軸０１２，ボールベアリング１９，中央部間隔筒１６，ボールベアリング２０，ブレーキパネル１５，側部間隔筒１８及び右側フォーク脚２Ｒへと嵌挿し，その先端部にセルフナット３４を螺合して，組立は完了する。この場合，上記ロックナット３０及びセルフナット３４は，当初，緩めに締め付けた状態でチェン調整ボルト７により後車軸１１を後方へ変位させてチェン３５に適当な張りを与え，その後，強く締め付けるものである。
【０００８】
その後，パンク修理等のために，後輪Ｗｒを取外す場合には，先ず後車軸１１を抜き取り，次いで側部間隔筒１８を外してから，ハブ１４を右方へシフトすれば，左側フォーク脚２Ｌに固着された筒軸０１２に駆動盤１３を残したまゝ，ハブ１４即ち後輪Ｗｒを分離することができる。このように，駆動盤１３を左側フォーク脚２Ｌ側の定位置に残したまゝ，後輪Ｗｒの取外しができるので，その取外し作業は勿論，再組立作業も容易となり，しかも再組立後，チェンの再調整も不要となる。
【０００９】
【発明が解決しようとする課題】
ところが，上記従来のものでは，筒軸０１２を左側フォーク脚２Ｌに固着するために，それを該フォーク脚２Ｌの外方まで突出させ，その突出端部にロックナット３０を螺合するものであるから，筒軸０１２の駆動盤からの突出長さは大きく設定する必要がある。このため，後輪系組立体０２８の横幅Ｌ₁が必然的に長くなり，自動二輪車の組立工程で，後輪系組立体０２８を左右のフォーク脚２Ｌ，２Ｒ間へ挿入するとき，部品相互を衝突させる虞れがある。またフォーク脚２Ｌ，２Ｒの後車軸１１に対する支持剛性を高めるべく，フォーク脚２Ｌ，２Ｒの厚みの大きい部分で後車軸１１を支持する場合には，それを貫通する筒軸０１２は，一層長いものが必要となることから，左右のフォーク脚２Ｌ，２Ｒの間隔を特別に広げなければ，上記構造の採用が困難となる。
【００１０】
本発明は，かゝる事情に鑑みてなされたもので，自動二輪車の組立工程では，リヤフォークの左右一対のフォーク脚間に，筒軸を有する後輪系組立体を，部品相互を衝突させることなく容易に挿入することができ，またフォーク脚の厚みの大きい部分で後車軸を支持する場合でも，左右のフォーク脚の間隔を特別に広げずに該後輪系組立体の挿入を可能にする，組立性の良好な，前部自動二輪車における後輪の支持及び駆動装置を提供することを目的とする。
【００１１】
【課題を解決するための手段】
上記目的を達成するために，本発明は，リヤフォークの左右一対のフォーク脚に両端を支持される後車軸の外周に，一方のフォーク脚に支持される筒軸を嵌合し，この筒軸に，動力源からチエン駆動される駆動盤を回転自在に装着し，更に後車軸には，駆動盤と軸方向抜き差し可能に連結される後輪のハブと，このハブと他方のフォーク脚との間に，駆動盤に対するハブの軸方向連結深さより長い間隔筒を介裝した，自動二輪車における後輪の支持及び駆動装置において，前記一方のフォーク脚に，その内側壁近傍で前記筒軸と着脱可能に連結して，後車軸の取外し時でも外筒軸を支持し得る支持手段を設けことを第１の特徴とする。
【００１２】
この第１の特徴によれば，筒軸を一方のフォーク脚に貫通させずとも，これを支持手段により該フォーク脚に支持させることができる。したがって，筒軸の駆動盤からの突出長さが大幅に短縮されることになるから，筒軸，駆動盤及び後輪からなる後輪系組立体の横幅も大幅に短縮し，組立工程で，この後輪系組立体を左右のフォーク脚間に容易に挿入することができる。またフォーク脚の厚みの大きい部分で後車軸を支持する場合でも，左右のフォーク脚の間隔を特別に広げずに該後輪系組立体の挿入を行うことができる。
【００１３】
また本発明は，上記特徴に加えて，前記筒軸を，その先端が前記一方のフォーク脚の車軸孔に突入して該フォーク脚内で終わるように形成する一方，前記支持手段を，筒軸の外周に設けられて前記一方のフォーク脚内側面に当接する当接部と，該フォーク脚の外側面側からその車軸孔に挿通されて筒軸に螺着することにより，前記当接部と協働して該フォーク脚をその内外両側面から緊締するボルト部材とで構成したことを第２の特徴とする。
【００１４】
この第２の特徴によれば，筒軸を一方のフォーク脚に貫通させずとも，これをボルト部材により該フォーク脚に固着することができ，したがって，従来の場合と同様に，駆動盤を一方のフォーク脚側に残したまゝの状態で後輪の脱着が可能である。
【００１５】
【発明の実施の形態】
発明の実施の形態を，添付図面に示す本発明の実施例に基づいて以下に説明する。
【００１６】
先ず，図１ないし図４により本発明の第１実施例について説明する。図１は自動二輪車の側面図，図２は図１の２−２線断面図，図３は図２の３−３線断面図，図４は図２の４−４線断面図である。
【００１７】
図１及び図２おいて，自動二輪車Ｍのフレーム１の後部に，左右一対のフォーク脚２Ｌ，２Ｒを備えたリヤフォーク２の前端が水平な枢軸３を介して連結され，各フォーク脚２Ｌ，２Ｒとフレーム１との間に，リヤフォーク２の上下揺動を緩衝するクッションユニット４が介裝される。
【００１８】
図２及び図３に示すように，各フォーク脚２Ｌ，２Ｒは，長辺を上下方向に向けた矩形断面の角パイプ材で構成され，各フォーク脚２Ｌ，２Ｒの後端部の両側壁には，前後方向に延びる長孔状の車軸孔５が設けられる。左側フォーク脚２Ｌの内側面には，車軸孔５と一致する長孔を持った補強板４２が溶接される。
【００１９】
各フォーク脚２Ｌ，２Ｒ内には，車軸孔５と軸方向に並ぶボス６ａを有するコ字状の車軸支持部材６が前後方向摺動可能に収容される。この車軸支持部材６の後端には調整ボルト７が固設されており，その先端は，各フォーク脚２Ｌ，２Ｒの後端に溶接される閉塞端板８を貫通して後方に突出していて，調整ナット９及びロックナット１０を螺合される。
【００２０】
後車軸１１は，両フォーク脚２Ｌ，２Ｒの車軸孔５及びボス６ａを貫通して配置される。この後車軸１１には，図８に示す従来のものと同様の構造をもって筒軸１２，駆動盤１３，後輪Ｗｒのハブ１４，ブレーキパネル１５，挟持筒１７及び側部間隔筒１８が取付けられる。
【００２１】
即ち，後車軸１１の中央部で後輪Ｗｒのハブ１４が，中央部間隔筒１６を挟んで並ぶ左右一対のボールベアリング１９，２０を介して支承され，このハブ１４の左側に，後車軸１１に貫通される筒軸１２が配置され，ハブ１４の右側に，後車軸１１に貫通されるブレーキパネル１５及び側部間隔筒１８が配置される。筒軸１２の外周には，左側面にスプロケット２１をボルト２２で固着した駆動盤１３がボールベアリング２３を介して装着される。その際，上記ボールベアリング２３のアウタレース２３ｏは駆動盤１３に圧入され，そのインナレース２３ｉは，筒軸１２に嵌挿されて左側フォーク脚２Ｌの内側面に当接する挟持筒１７と，筒軸１２に形成されたフランジ１２ａとで挟持される。
【００２２】
駆動盤１３及びハブ１４の相対向面には，複数の伝動突起２４及び係合凹部２５がそれぞれ形成されており，これらはダンパゴム２６を介して互いに軸方向抜き差し可能に嵌合される（図４参照）。したがって，ダンパゴム２６の緩衝作用により，駆動盤１３及びハブ１４間の伝達トルクを吸収し得るようになっている。
【００２３】
駆動盤１３には，ボールベアリング２３の外側に隣接して挟持筒１７の外周面に密接するダストシール２７が装着される。
【００２４】
筒軸１２は，従来のものとは異なり，挟持筒１７の外端面からの突出長さが短くなっていて，その先端部が前記車軸支持部材６のボス６ａの途中までしか嵌合しないようになっている。
【００２５】
したがって，筒軸１２，駆動盤１３，後輪Ｗｒ及びブレーキパネル１５からなる後輪系組立体２８の横幅Ｌ₁は，左右のフォーク脚２Ｌ，２Ｒの内側面間距離Ｌ₂より充分に小さくなっている。勿論，側部間隔筒１８の長さＬ₃は，駆動盤１３及びハブ１４の嵌合深さＬ₄より大きく設定されている。
【００２６】
筒軸１２の先端部にはねじ孔１２ｂが形成されており，これに左側フォーク脚２Ｌの外側から車軸孔５及びボス６ａに挿入したねじ筒２９が螺着され，このねじ筒２９の外端にロックナット３０が螺合，緊締される。ねじ筒２９を筒軸１２のねじ孔１２ｂに螺合する際に筒軸１２の回り止めを行うべく，筒軸１２の外周には，車軸孔５の平坦な上下内側面に当接する一対の面取り部３１が形成される。
【００２７】
ねじ筒２９及びロックナット３０は，ボルト部材３２を構成するものであり，このボルト部材３２が挟持筒１７と協働して左側フォーク脚２Ｌを挟持することにより，筒軸１２が該フォーク脚２Ｌに固着される。また挟持筒１７（当接部）及びボルト部材３２により本発明の支持手段３３が構成される。
【００２８】
ねじ筒２９は後車軸１１上に嵌装される。後車軸１１の六角頭部１１ａは，ねじ筒２９の外端に当接させ，先端のねじ軸部１１ｂにはセルフナット３４が螺合，緊締される。
【００２９】
尚，図中，３５はチェン３５を覆うチェンカバーであり，これは左側フォーク脚２Ｌ内側面の補強板４２に形成されたカバーブラケット３７にボルト結合される。
【００３０】
次に，この実施例に作用について説明する。
【００３１】
自動二輪車の組立て当たっては，従来の場合と同様に予め後輪系組立体２８を組立て，これを両フォーク脚２Ｌ，２Ｒ間に挿入することができる。その際，前述のように，筒軸１２は左側フォーク脚２Ｌに貫通させるものではないから，この筒軸１２の，挟持筒１７外端面からの突出長さが短く，したがって後輪系組立体２８の横幅Ｌ₁が左右のフォーク脚２Ｌ，２Ｒの内側面間距離Ｌ₂より充分に短くなっているから，左右のフォーク脚２Ｌ，２Ｒと後輪系組立体２８との衝突を容易に回避することができる。このことは，各フォーク脚２Ｌ，２Ｒの，後車軸１１を支持する部分が図示例のように厚肉であっても，左右のフォーク脚２Ｌ，２Ｒの内側面間距離Ｌ₂を特に拡大させずに，両フォーク脚２Ｌ，２Ｒ間への後輪系組立体２８の挿入を可能にすることを意味する。
【００３２】
両フォーク脚２Ｌ，２Ｒ間への挿入後，後輪系組立体２８は，左方へ移動して筒軸１２を左側フォーク脚２Ｌの車軸孔５及び車軸支持部材６のボス６ａに挿入し，左側フォーク脚２Ｌの外側から車軸孔５及びボス６ａに挿入したねじ筒２９を筒軸１２のねじ孔１２ｂに螺合し，このねじ筒２９の外端部にロックナット３０を螺合する。そしてブレーキパネル１５と右側フォーク脚２Ｒとの間に側部間隔筒１８を挿入してから，後車軸１１をねじ筒２９，筒軸１２，ボールベアリング１９，中央部間隔筒１６，ボールベアリング２０，ブレーキパネル１５，側部間隔筒１８及び右側フォーク脚２Ｒへと嵌挿し，その先端のねじ軸部１１ｂにセルフナット３４を螺合する。この場合，上記ロックナット３０及びセルフナット３４は，当初，緩めに締め付けた状態でチェン調整ボルト７に対して調整ナット９を締め込めば，調整ボルト７を介して車軸支持部材６を後車軸１１と共に後方へ変位させ，チェン３５に適当な張りを与えることができる。こうしたチェン調整の後に，前記ロックナット３０及びセルフナット３４を緊締する。
【００３３】
その後，パンク修理等のために，後輪Ｗｒを取外す場合には，先ず後車軸１１を抜き取り，次いで側部間隔筒１８を外してから，ハブ１４を右方へ移動すれば，左側フォーク脚２Ｌにボルト部材３２を介して固着された筒軸１２に駆動盤１３を残したまゝ，ハブ１４即ち後輪Ｗｒを分離することができる。したがって，従来の場合と同様に，後輪Ｗｒの取外し作業は勿論，再組立作業も容易であり，再組立後，チェン３５の再調整も不要である。
【００３４】
次に，図５ないし図７により本発明の第２実施例について説明する。図５ないし図７は本発明の第２実施例を示すもので，図５は図２と同様な断面図，図６は図５の６−６線断面図，図７は図５の７−７線断面図である。
【００３５】
この実施例は，筒軸１１２の支持手段１１７において前実施例と相違するもので，それについて説明する。
【００３６】
挟持筒１７は外形が四角形になっており，その外周に周溝１１７ａが設けられる。この挟持筒１１７は筒軸１１２の外周に螺着される。その際，筒軸１１２は，その先端を挟持筒１１７の内部で終わらせるほど，前実施例の筒軸１１２より短くなっている。
【００３７】
一方，左側フォーク脚２Ｌの内側面に溶接された補強板４２に，挟持筒１１７を支持する支持枠４１が溶接される。この支持枠４１は，直線部を長孔状の車軸孔５と平行に延ばし且つ開放端を後方へ向けたＵ字状をなしており，そして補強板４２の側面に間隙を存して対向する内向きフランジ４１ａを備えている。この内向きフランジ４１ａに挟持筒１１７の周溝１１７ａが係合するようになっており，この周溝１１７ａ及び支持枠４１により支持手段１３３が構成される。その他の構成は前実施例と同様であるので，図中，前実施例との対応部分には同一符号を付して，その説明を省略する。
【００３８】
而して，筒軸１１２，挟持筒１１７，駆動盤１３，後輪Ｗｒ及びブレーキパネル１５で後輪系組立体１２８を構成したとき，筒軸１１２は挟持筒１１７の外端面から全く突出していないから，後輪系組立体１２８の横幅Ｌ₁は前記実施例のそれより小さいものとなる。したがって，組立工程で，左右のフォーク脚２Ｌ，２Ｒ間に後輪系組立体１２８を極めて容易に挿入することができると共に，挟持筒１１７の周溝１１７ａを支持枠４１の内向きフランジ４１ａに係合することにより，挟持筒１１７を介して筒軸１１２を支持することができる。その後の組立作業は，前実施例と同様の要領で行われる。
【００３９】
本発明は上記実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。例えば，第１実施例において，ねじ筒２９とロックナット３０を一体化することもできる。
【００４０】
【発明の効果】
以上のように本発明の第１の特徴によれば，リヤフォークの左右一対のフォーク脚に両端を支持される後車軸の外周に，一方のフォーク脚に支持される筒軸を嵌合し，この筒軸に，動力源からチエン駆動される駆動盤を回転自在に装着し，更に後車軸には，駆動盤と軸方向抜き差し可能に連結される後輪のハブと，このハブと他方のフォーク脚との間に，駆動盤に対するハブの軸方向連結深さより長い側部間隔筒を介裝した，自動二輪車における後輪の支持及び駆動装置において，前記一方のフォーク脚に，その内側壁近傍で前記筒軸と着脱可能に連結して，後車軸の取外し時でも外筒軸を支持し得る支持手段を設けので，筒軸を一方のフォーク脚に貫通させずとも，これを支持手段により該フォーク脚に支持させることができ，したがって，筒軸の駆動盤からの突出長さが大幅に短縮され，組立工程で，部品相互の衝突を避けつゝ後輪系組立体を左右のフォーク脚間に容易に挿入することができ，組立性が向上する。またフォーク脚の厚みの大きい部分で後車軸を支持する場合でも，左右のフォーク脚の間隔を特別に広げずに該後輪系組立体の挿入を行うことができる。
【００４１】
また本発明の第２の特徴によれば，前記筒軸を，その先端が前記一方のフォーク脚の車軸孔に突入して該フォーク脚内で終わるように形成する一方，前記支持手段を，筒軸の外周に設けられて前記一方のフォーク脚内側面に当接する当接部と，該フォーク脚の外側面側からその車軸孔に挿通されて筒軸に螺着することにより，前記当接部と協働して該フォーク脚をその内外両側面から緊締するボルト部材とで構成したので，筒軸を一方のフォーク脚に貫通させずとも，これをボルト部材により該フォーク脚に固着することができ，したがって，従来の場合と同様に，駆動盤を一方のフォーク脚側に残したまゝの状態で後輪の脱着が可能であり，したがってチェンの再調整も不要であり，良好なメンテナンス性が確保される。
【図面の簡単な説明】
【図１】本発明の第１実施例に係る自動二輪車の側面図。
【図２】図１の２−２線断面図。
【図３】図２の３−３線断面図。
【図４】図２の４−４線断面図。
【図５】本発明の第２実施例を示す，図２と同様な断面図。
【図６】図５の６−６線断面図。
【図７】図５の７−７線断面図。
【図８】従来の自動二輪車における後輪の支持及び駆動装置の縦断平面図。
【符号の説明】
Ｍ・・・・・自動二輪車
Ｌ₁・・・・後輪系組立体の横幅
Ｌ₂・・・・左右のフォーク脚の内側面間距離
Ｌ₃・・・・側部間隔筒の長さ
Ｌ₄・・・・駆動盤及び後輪ハブの軸方向連結深さ
Ｗｒ・・・・後輪
２・・・・・リヤフォーク
２Ｌ・・・・一方のフォーク脚（左側フォーク脚）
２Ｒ・・・・他方のフォーク脚（右側フォーク脚）
５・・・・・車軸孔
１１・・・・後車軸
１２，１１２・・・筒軸
１３・・・・駆動盤
１８・・・・側部間隔筒
２８，１２８・・・後輪系組立体
３３，１３３・・・支持手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear wheel support and drive device for a motorcycle, and in particular, a cylindrical shaft supported by one fork leg is fitted to the outer periphery of a rear axle supported at both ends by a pair of left and right fork legs of a rear fork. A drive panel that is driven by a power source in a chain manner is rotatably mounted by the cylinder shaft, and a rear wheel hub connected to the drive panel in an axially removable manner is connected to the rear axle. It is related with the improvement of the thing which interposed the side space | interval cylinder longer than the axial connection depth of the hub with respect to a drive panel between the fork leg of this.
[0002]
[Prior art]
FIG. 8 shows a conventional rear wheel support and drive device. In the figure, 2L and 2R are a pair of left and right fork legs constituting the rear fork 2 of the motorcycle, and both end portions of the rear axle 11 passing through the axle hole 5 are tightened and supported by these rear end portions. The hub 14 of the rear wheel Wr is supported at the center of the rear axle 11 via a pair of left and right ball bearings 19 and 20 that are arranged with the center space cylinder 16 in between, and on the left side of the hub 14 on the rear axle 11. A penetrating cylinder shaft 012 is disposed, and a brake panel 15 penetrating the rear axle 11 and a side interval cylinder 18 are disposed on the right side of the hub 14.
[0003]
On the outer periphery of the cylindrical shaft 012, a drive panel 13 having a sprocket 21 fixed to the left side with a bolt 22 is mounted via a ball bearing 23. At that time, the outer race 23o of the ball bearing 23 is lightly press-fitted into the drive panel member, and the inner race 23i is inserted into the cylindrical shaft 012 and is in contact with the inner surface of the left fork leg 2L, and the cylindrical shaft It is clamped by a flange 012a formed on 012. A plurality of transmission protrusions 24 and engagement recesses 25 are respectively formed on the opposing surfaces of the drive panel 13 and the hub 14, and these are fitted through a damper rubber 26 so that they can be inserted and removed in the axial direction.
[0004]
The cylindrical shaft 012 has its left end protruding to the outside of the left fork leg 2L. By screwing and tightening the lock nut 30 to the protruding end, the cylindrical shaft 012 is coupled with the inner race 23i to the left fork leg. Fixed and supported at 2L. The rear axle 11 is composed of a bolt having a hexagonal head 11a at one end and a screw shaft portion 11b at the other end. The head 11a is brought into contact with the outer end of the cylindrical shaft 012 and the screw shaft portion 11b at the front end. The self-nut 34 is screwed and tightened to fix the two fork legs 2L and 2R.
[0005]
Reference numeral 35 denotes a chain that is driven from an engine (not shown) to drive the sprocket 21, and 7 is a chain adjusting bolt that adjusts the tension of the chain 35.
[0006]
Thus, the rear wheel assembly 028 is constituted by the rear wheel Wr, the cylinder shaft 012, the drive panel 13, the holding cylinder 17 and the brake panel 15, and the lateral width L ₁ of the assembly 028, that is, the cylinder shaft 012 and the brake panel. The distance between the outer end faces 15 is set to be smaller than the distance L ₂ between the inner faces of the fork legs 2L and 2R. Further, the length L ₃ of the side interval tube 18 is set to be larger than the fitting depth L ₄ of the drive panel 13 and the hub 14.
[0007]
Therefore, when assembling the motorcycle, the rear wheel system assembly 028 can be assembled in advance and inserted between the fork legs 2L and 2R. Then, the cylindrical shaft 012 is inserted into the axle hole 5 of the left fork leg 2L while moving the assembly 028 to the left, protrudes outward, and the lock nut 30 is screwed into the protruding end. Next, after inserting the side interval cylinder 18 between the brake panel 15 and the right fork leg 2R, the rear axle 11 is connected to the cylinder axis 012, the ball bearing 19, the center interval cylinder 16, the ball bearing 20, and the brake panel 15. The side interval cylinder 18 and the right fork leg 2R are fitted and inserted, and the self-nut 34 is screwed to the front end thereof, and the assembly is completed. In this case, the lock nut 30 and the self-nut 34 are initially tightened loosely, the rear axle 11 is displaced rearward by the chain adjusting bolt 7 to give an appropriate tension to the chain 35, and then tightened strongly. is there.
[0008]
Thereafter, when the rear wheel Wr is removed for puncture repair or the like, the rear axle 11 is first extracted, then the side spacing cylinder 18 is removed, and then the hub 14 is shifted to the right to shift the left fork leg 2L. The hub 14, that is, the rear wheel Wr can be separated while leaving the drive panel 13 on the cylinder shaft 012 fixed to the cylinder shaft 012. In this way, the rear wheel Wr can be removed while the drive panel 13 is left in place on the left fork leg 2L side, so that it is easy to remove and reassemble, and after reassembly, Readjustment is also unnecessary.
[0009]
[Problems to be solved by the invention]
However, in the above-mentioned conventional one, in order to fix the tube shaft 012 to the left fork leg 2L, it protrudes to the outside of the fork leg 2L, and the lock nut 30 is screwed to the protruding end. Therefore, it is necessary to set the protruding length of the cylindrical shaft 012 from the drive panel large. For this reason, the lateral width L ₁ of the rear wheel assembly 028 is inevitably long, and when the rear wheel assembly 028 is inserted between the left and right fork legs 2L and 2R in the assembly process of the motorcycle, the components are There is a risk of collision. Further, when the rear axle 11 is supported by the thick portions of the fork legs 2L and 2R in order to increase the support rigidity for the rear axle 11 of the fork legs 2L and 2R, the cylindrical shaft 012 passing through the fork legs 2L and 2R has a longer length. Therefore, it is difficult to adopt the above structure unless the distance between the left and right fork legs 2L and 2R is specifically increased.
[0010]
The present invention has been made in view of such circumstances, and in the assembly process of a motorcycle, a rear wheel system assembly having a cylindrical shaft is caused to collide with each other between a pair of left and right fork legs of a rear fork. The rear wheel assembly can be inserted without specially increasing the distance between the left and right fork legs even when the rear axle is supported by the thick part of the fork legs. It is an object of the present invention to provide a rear wheel support and drive device for a front motorcycle with good assembly.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a cylindrical shaft supported by one fork leg is fitted on the outer periphery of a rear axle supported at both ends by a pair of left and right fork legs of a rear fork. In addition, a drive panel driven by a power source in a chain is rotatably mounted, and the rear axle is connected with a rear wheel hub connected to the drive panel so that it can be inserted and removed in the axial direction, and this hub and the other fork leg. In the support and drive device for the rear wheel in a motorcycle, with a space cylinder longer than the axial connection depth of the hub with respect to the drive panel, the cylinder shaft is attached to and detached from the one fork leg in the vicinity of the inner wall. A first feature is to provide a support means that can be connected to support the outer cylinder shaft even when the rear axle is removed.
[0012]
According to the first feature, the cylindrical shaft can be supported by the fork leg by the supporting means without passing through the fork leg. Therefore, since the protruding length of the cylinder shaft from the drive panel is greatly shortened, the lateral width of the rear wheel system assembly consisting of the cylinder shaft, drive panel and rear wheel is also greatly reduced. This rear wheel system assembly can be easily inserted between the left and right fork legs. Further, even when the rear axle is supported by the thick portion of the fork leg, the rear wheel system assembly can be inserted without specially increasing the distance between the left and right fork legs.
[0013]
According to the present invention, in addition to the above features, the cylindrical shaft is formed such that a tip of the cylindrical shaft enters the axle hole of the one fork leg and ends in the fork leg. A contact portion provided on an outer periphery of the fork leg and contacting the inner side surface of the one fork leg; and by inserting the shaft hole from the outer surface side of the fork leg into the axle shaft and screwing it to the cylindrical shaft; A second feature is that the fork leg is constituted by a bolt member that fastens the fork leg from both the inner and outer side surfaces.
[0014]
According to the second feature, it is possible to fix the cylinder shaft to the fork leg by a bolt member without passing the cylinder shaft through the one fork leg. The rear wheel can be attached and detached while remaining on the fork leg side.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.
[0016]
First, a first embodiment of the present invention will be described with reference to FIGS. 1 is a side view of the motorcycle, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, and FIG.
[0017]
1 and 2, the front end of a rear fork 2 having a pair of left and right fork legs 2L, 2R is connected to the rear part of a frame 1 of a motorcycle M via a horizontal pivot 3, and each fork leg 2L, A cushion unit 4 that cushions the vertical swing of the rear fork 2 is interposed between the 2R and the frame 1.
[0018]
As shown in FIG. 2 and FIG. 3, each fork leg 2L, 2R is formed of a rectangular pipe material having a rectangular cross section with its long side facing up and down, and is formed on both side walls at the rear end of each fork leg 2L, 2R. Is provided with a long hole-like axle hole 5 extending in the front-rear direction. A reinforcing plate 42 having a long hole coinciding with the axle hole 5 is welded to the inner side surface of the left fork leg 2L.
[0019]
In each fork leg 2L, 2R, a U-shaped axle support member 6 having an axle hole 5 and a boss 6a aligned in the axial direction is accommodated so as to be slidable in the front-rear direction. An adjustment bolt 7 is fixed to the rear end of the axle support member 6, and the front end of the axle support member 6 projects rearward through a closed end plate 8 welded to the rear end of each fork leg 2L, 2R. , The adjustment nut 9 and the lock nut 10 are screwed together.
[0020]
The rear axle 11 is disposed through the axle hole 5 and the boss 6a of both fork legs 2L and 2R. The rear axle 11 is provided with a cylindrical shaft 12, a drive panel 13, a hub 14 of the rear wheel Wr, a brake panel 15, a sandwiching cylinder 17, and a side interval cylinder 18 having the same structure as the conventional one shown in FIG. .
[0021]
That is, the hub 14 of the rear wheel Wr is supported at the center of the rear axle 11 via a pair of left and right ball bearings 19 and 20 that are arranged with the center space cylinder 16 interposed therebetween. A cylinder shaft 12 penetrating the rear axle 11 is disposed, and a brake panel 15 penetrating the rear axle 11 and a side interval cylinder 18 are disposed on the right side of the hub 14. On the outer periphery of the cylindrical shaft 12, a drive panel 13 having a sprocket 21 fixed to the left side with a bolt 22 is mounted via a ball bearing 23. At that time, the outer race 23o of the ball bearing 23 is press-fitted into the drive panel 13, and the inner race 23i is inserted into the cylindrical shaft 12 and is in contact with the inner surface of the left fork leg 2L, and the cylindrical shaft 12 And the flange 12a formed on
[0022]
A plurality of transmission projections 24 and engagement recesses 25 are formed on the opposing surfaces of the drive panel 13 and the hub 14, respectively, and these are fitted to each other via a damper rubber 26 so that they can be inserted and removed in the axial direction (FIG. 4). reference). Therefore, the transmission torque between the drive panel 13 and the hub 14 can be absorbed by the buffering action of the damper rubber 26.
[0023]
A dust seal 27 is attached to the drive panel 13 so as to be in close contact with the outer peripheral surface of the holding cylinder 17 adjacent to the outside of the ball bearing 23.
[0024]
Unlike the conventional one, the cylindrical shaft 12 has a short projecting length from the outer end surface of the sandwiching cylinder 17 so that the tip of the cylindrical shaft 12 can only fit partway through the boss 6a of the axle support member 6. It has become.
[0025]
Accordingly, the lateral width L ₁ of the rear wheel system assembly 28 including the cylindrical shaft 12, the drive panel 13, the rear wheel Wr, and the brake panel 15 is sufficiently smaller than the distance L ₂ between the inner side surfaces of the left and right fork legs 2L, 2R. ing. Of course, the length L ₃ of the side space cylinder 18 is set larger than the fitting depth L ₄ of the drive panel 13 and the hub 14.
[0026]
A screw hole 12b is formed at the tip of the cylinder shaft 12, and a screw cylinder 29 inserted into the axle hole 5 and the boss 6a from the outside of the left fork leg 2L is screwed into the screw hole 12b. The lock nut 30 is screwed and tightened. A pair of chamfers that are in contact with the flat upper and lower inner surfaces of the axle hole 5 are provided on the outer periphery of the cylinder shaft 12 in order to prevent the cylinder shaft 12 from rotating when the screw cylinder 29 is screwed into the screw hole 12 b of the cylinder shaft 12. Part 31 is formed.
[0027]
The screw cylinder 29 and the lock nut 30 constitute a bolt member 32. When the bolt member 32 cooperates with the sandwiching cylinder 17 and sandwiches the left fork leg 2L, the cylinder shaft 12 becomes the fork leg 2L. It is fixed to. The holding cylinder 17 (contact portion) and the bolt member 32 constitute the support means 33 of the present invention.
[0028]
The screw cylinder 29 is fitted on the rear axle 11. The hexagonal head portion 11a of the rear axle 11 is brought into contact with the outer end of the screw cylinder 29, and a self nut 34 is screwed and tightened to the screw shaft portion 11b at the front end.
[0029]
In the figure, reference numeral 35 denotes a chain cover for covering the chain 35, which is bolted to a cover bracket 37 formed on the reinforcing plate 42 on the inner side surface of the left fork leg 2L.
[0030]
Next, the operation of this embodiment will be described.
[0031]
In assembling the motorcycle, the rear wheel system assembly 28 can be assembled in advance and inserted between the fork legs 2L and 2R as in the conventional case. At this time, as described above, the cylinder shaft 12 is not passed through the left fork leg 2L, and therefore, the protruding length of the cylinder shaft 12 from the outer end surface of the holding cylinder 17 is short, and therefore the rear wheel system assembly 28 is provided. width L ₁ is the left and right fork legs 2L, because they become sufficiently shorter than the inner surface between the distance L ₂ 2R, easily avoid collision with the left and right fork legs 2L, 2R and the rear wheels based assembly 28 of be able to. This is each fork leg 2L, the 2R, even thick as portion supporting the illustrated embodiment the rear axle 11, the left and right fork legs 2L, the inner surface between the distance L ₂ 2R is particularly magnified In other words, this means that the rear wheel system assembly 28 can be inserted between the fork legs 2L and 2R.
[0032]
After the insertion between the fork legs 2L and 2R, the rear wheel system assembly 28 moves to the left to insert the cylinder shaft 12 into the axle hole 5 of the left fork leg 2L and the boss 6a of the axle support member 6. A screw tube 29 inserted into the axle hole 5 and the boss 6a from the outside of the left fork leg 2L is screwed into the screw hole 12b of the tube shaft 12, and a lock nut 30 is screwed into the outer end portion of the screw tube 29. Then, after inserting the side spacing cylinder 18 between the brake panel 15 and the right fork leg 2R, the rear axle 11 is screw cylinder 29, cylinder shaft 12, ball bearing 19, center spacing cylinder 16, ball bearing 20, The brake panel 15, the side spacing cylinder 18 and the right fork leg 2R are fitted and inserted, and the self nut 34 is screwed onto the screw shaft portion 11b at the tip. In this case, if the lock nut 30 and the self-nut 34 are initially loosely tightened and the adjustment nut 9 is tightened with respect to the chain adjustment bolt 7, the axle support member 6 is attached to the rear axle 11 via the adjustment bolt 7. At the same time, the chain 35 can be displaced rearward to give an appropriate tension to the chain 35. After such chain adjustment, the lock nut 30 and the self nut 34 are tightened.
[0033]
Thereafter, when the rear wheel Wr is removed for puncture repair or the like, the rear axle 11 is first removed, then the side spacing cylinder 18 is removed, and then the hub 14 is moved rightward to move the left fork leg 2L. The hub 14, that is, the rear wheel Wr can be separated while leaving the drive panel 13 on the cylindrical shaft 12 fixed to the cylinder shaft 12 through the bolt member 32. Therefore, as in the conventional case, not only the removal operation of the rear wheel Wr but also the reassembly operation is easy, and the readjustment of the chain 35 is unnecessary after the reassembly.
[0034]
Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7 show a second embodiment of the present invention. FIG. 5 is a sectional view similar to FIG. 2, FIG. 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. FIG.
[0035]
This embodiment is different from the previous embodiment in the support means 117 of the cylindrical shaft 112, and will be described.
[0036]
The sandwiching cylinder 17 has a rectangular outer shape, and a circumferential groove 117a is provided on the outer periphery thereof. The sandwiching cylinder 117 is screwed to the outer periphery of the cylinder shaft 112. At this time, the cylindrical shaft 112 is shorter than the cylindrical shaft 112 of the previous embodiment, so that the end of the cylindrical shaft 112 ends in the holding cylinder 117.
[0037]
On the other hand, the support frame 41 that supports the holding cylinder 117 is welded to the reinforcing plate 42 welded to the inner side surface of the left fork leg 2L. The support frame 41 has a U-shape in which the straight portion extends in parallel with the long hole-shaped axle hole 5 and the open end faces rearward, and faces the side surface of the reinforcing plate 42 with a gap. An inward flange 41a is provided. A circumferential groove 117a of the holding cylinder 117 is engaged with the inward flange 41a, and the circumferential groove 117a and the support frame 41 constitute a support means 133. Since other configurations are the same as those of the previous embodiment, portions corresponding to those of the previous embodiment are denoted by the same reference numerals and description thereof is omitted.
[0038]
Thus, when the rear wheel system assembly 128 is constituted by the cylinder shaft 112, the sandwiching cylinder 117, the drive panel 13, the rear wheel Wr, and the brake panel 15, the cylinder shaft 112 does not protrude from the outer end surface of the sandwiching cylinder 117 at all. Therefore, the lateral width L ₁ of the rear wheel system assembly 128 is smaller than that of the above embodiment. Accordingly, in the assembly process, the rear wheel assembly 128 can be inserted very easily between the left and right fork legs 2L, 2R, and the circumferential groove 117a of the holding cylinder 117 is engaged with the inward flange 41a of the support frame 41. By combining, the cylinder shaft 112 can be supported via the holding cylinder 117. Subsequent assembly work is performed in the same manner as in the previous embodiment.
[0039]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, in the first embodiment, the screw cylinder 29 and the lock nut 30 can be integrated.
[0040]
【The invention's effect】
As described above, according to the first feature of the present invention, the cylinder shaft supported by one fork leg is fitted to the outer periphery of the rear axle supported at both ends by the pair of left and right fork legs of the rear fork. A drive panel driven by a power source in a chain is rotatably mounted on the cylinder shaft, and a rear wheel hub connected to the drive panel in an axially removable manner is connected to the rear axle, and the hub and the other fork. In the rear wheel support and drive device for a motorcycle, which is interposed between the leg and the side spacing cylinder longer than the axial connection depth of the hub with respect to the drive panel, the one fork leg is placed near the inner wall. A support means is provided which is detachably connected to the cylinder shaft and can support the outer cylinder shaft even when the rear axle is removed. Therefore, the fork can be connected to the fork leg without supporting the cylinder shaft through one fork leg. Can be supported by the legs, so The projecting length of the cylinder shaft from the drive panel is greatly shortened, and the rear wheel system assembly can be easily inserted between the left and right fork legs while avoiding collisions between parts in the assembly process. Will improve. Further, even when the rear axle is supported by the thick portion of the fork leg, the rear wheel system assembly can be inserted without specially increasing the distance between the left and right fork legs.
[0041]
According to a second aspect of the present invention, the cylindrical shaft is formed such that a tip of the cylindrical shaft enters into an axle hole of the one fork leg and ends in the fork leg, and the support means includes a cylindrical shaft. A contact portion provided on an outer periphery of the shaft and contacting the inner surface of the one fork leg; and the contact portion is inserted into the axle hole from the outer surface side of the fork leg and screwed to the cylindrical shaft. Since the fork leg is composed of a bolt member that tightens from both the inner and outer sides in cooperation with the fork leg, the fork leg can be fixed to the fork leg by the bolt member without passing through the fork leg. Therefore, as in the conventional case, the rear wheel can be attached and removed with the drive panel left on one fork leg side, and therefore no chain readjustment is required, and good maintainability is achieved. Secured.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle according to a first embodiment of the present invention.
2 is a sectional view taken along line 2-2 of FIG.
3 is a cross-sectional view taken along line 3-3 in FIG.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a sectional view similar to FIG. 2, showing a second embodiment of the present invention.
6 is a cross-sectional view taken along line 6-6 in FIG.
7 is a cross-sectional view taken along line 7-7 in FIG.
FIG. 8 is a longitudinal plan view of a rear wheel support and drive device in a conventional motorcycle.
[Explanation of symbols]
M... Motorcycle L ₁ ... Rear wheel system width L ₂ ... Distance between inner surfaces of left and right fork legs L ₃ ... ₄ .... Axial connection depth Wr of drive panel and rear wheel hub ... Rear wheel 2 ... Rear fork 2L ... One fork leg (left fork leg)
2R ... The other fork leg (right fork leg)
5 ... axle hole 11 ... rear axle 12, 112 ... cylinder shaft 13 ... drive panel 18 ... side spacing cylinders 28, 128 ... rear wheel system assembly 33, 133 ... support means

Claims

A cylindrical shaft (12, 112) supported by one fork leg (2L) is provided on the outer periphery of the rear axle (11) supported at both ends by a pair of left and right fork legs (2L, 2R) of the rear fork (2). The drive shaft (13) that is fitted and is rotatably mounted on the cylindrical shafts (12, 112) from the power source, and the rear axle (11) is axially connected to the drive plate (13). An axial connection of the hub (14) to the drive panel (13) between the hub (14) of the rear wheel (Wr) connected so as to be able to be inserted and removed, and the hub (14) and the other fork leg (2R). In the support and drive device for the rear wheels in a motorcycle via a side spacing cylinder (18) longer than the depth (L ₄ ),
The cylindrical shaft (12, 112) is detachably connected to the one fork leg (2L) in the vicinity of the inner wall thereof, and the cylindrical shaft (12, 112) is supported even when the rear axle (11) is removed. A support and drive device for a rear wheel in a motorcycle, characterized in that the support means (33, 133) are provided.

In claim 1,
The cylindrical shaft (12) is formed so that the tip thereof enters the axle hole (5) of the one fork leg (2L) and ends in the fork leg (2L), while the supporting means (33) A contact portion (17) provided on an outer periphery of the cylindrical shaft (12) and contacting an inner surface of the fork leg (2L), and an axle hole of the fork leg (2L) from an outer surface side thereof. A bolt member (32) which is inserted into (5) and screwed onto the cylindrical shaft (12) to tighten the fork leg (2L) from both the inner and outer side surfaces in cooperation with the contact portion (17). A rear wheel support and drive device for a motorcycle, characterized by comprising: