JP4215528B2

JP4215528B2 - Tricycle

Info

Publication number: JP4215528B2
Application number: JP2003022890A
Authority: JP
Inventors: 和己西村
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2003-01-31
Filing date: 2003-01-31
Publication date: 2009-01-28
Anticipated expiration: 2023-01-31
Also published as: JP2004231078A

Description

【０００１】
【発明の属する技術分野】
本発明は三輪自転車に関する。
【０００２】
【従来の技術】
車体後部に左右一対の後輪を備えた三輪自転車は、一般の二輪の自転車と比較して、停止状態や低速状態でも起立姿勢を安定して維持できる利点があるとともに、左右の後輪の間に、荷物を載せる荷台や人を載せる後部座席を設置できる利点がある。
【０００３】
この種の三輪自転車に関する技術として、特許文献１に、三輪自転車の後輪駆動装置が開示されている。この三輪自転車の後輪駆動装置は、図８に示すように、左右一対の後輪５０の内側側面に、同軸心で一体的に回転する後輪ギヤ５１をそれぞれ取り付け、これらの後輪５０や後輪ギヤ５１の軸（後輪軸と称す）５７よりも上方箇所に、入力チェーン５２および入力ギヤ５３を介して車体前部側からの駆動力を入力する入力軸５４を配設し、入力軸５４の両側に取り付けた駆動ギヤ５５と前記後輪ギヤ５１とを伝達チェーン５６で連結した構造である。
【０００４】
なお、後輪５０や後輪ギヤ５１の支持構造や、駆動ギヤ５５の支持構造については、特許文献１には具体的な記載がないが、車体後部に設けたフレームにより、後輪軸５７と入力軸５４とをそれぞれ所定の固定位置で支持する構成であると考えられる。
【０００５】
この後輪駆動装置によれば、入力ギヤ５３や片側の駆動ギヤ５５として、一方向クラッチを内装したフリーギヤ構造を採用することで、左右の後輪５０が異なる回転となることが許容されるので、一本の車軸で左右の後輪を結合して一体的に回転させる構造の場合と比べて、走行時の回転半径を小さくすることができる。
【０００６】
【特許文献１】
実開平６−３２２９０号公報
【０００７】
【発明が解決しようとする課題】
しかしながら、上記特許文献１の構造では、後輪軸５７と入力軸５４とをそれぞれ所定の固定位置で支持する構造であるので、後部支持フレームにより後輪軸５７と入力軸５４とを所定位置で支持するとともに、後部支持フレームに、人が乗る後部座席を取り付けた場合には、後輪５０が地面から受けた振動が、前記後部座席に直接伝わってしまい、乗り心地が極めて悪くなってしまう。
【０００８】
これに対処する手法としては、後輪軸５７をサスペンション機構により支持して、後輪５０が地面から受けた振動を前記サスペンション機構により吸収することが考えられる。しかしながら、この場合には、三輪自転車の走行時に後輪軸５７と入力軸５４との相対位置が変動するため、これらの相対位置の距離変動を吸収するための機構が別途に必要となり、例えば、前記伝達チェーン５６などにより、後輪軸５７と入力５４とを連結した場合には、チェーンテンショナーなどを設ける必要があるなど、製造コストの増加を招いてしまう。
【０００９】
本発明は上記課題を解決するもので、後輪からの振動が後部座席に伝わることを最小限に抑えることができながら、後輪軸に対する軸間距離の変動を吸収するための機構を設けなくても済む三輪自転車を提供することを目的とするものである。
【００１０】
【課題を解決するための手段】
上記課題を解決するために本発明の請求項１〜４に記載の三輪自転車における共通の構成は、左右一対の後輪側へ伝達する駆動力が入力される入力軸と、後輪軸を揺動自在に支持する揺動中心軸と、前記入力軸に取り付けられた左右一対の駆動側伝達輪体と、前記後輪軸に取り付けられて、前記駆動側伝達輪体からの駆動力が、無端状体を介してまたは直接に伝達される左右の従動側伝達輪体とを備え、前記入力軸と前記揺動中心軸とを同軸心に配設したことを特徴とする。
【００１１】
この構成により、後輪が揺動中心軸を中心として揺動するようにサスペンション機構を装着することができながら、入力軸と揺動中心軸とが同軸心に配設されているため、後輪が揺動中心軸を中心として揺動した場合でも、入力軸に取り付けた駆動側伝達輪体と後輪軸に取り付けた従動側伝達輪体との距離が変化せずに一定となる。この結果、これらの伝達輪体同士を無端状体を介して連動させる場合、または伝達輪体同士を直接連動させる場合の何れの場合でも、これらの伝達輪体間の相対位置の距離変動を吸収するための機構が不要となり、製造コストを低減させることができる。
【００１２】
請求項１記載の発明は、上記共通構成に加えて、入力軸に、入力軸への駆動力を入力する１つの１次入力輪体と、入力軸からの駆動力を出力する２つの１次出力輪体とを取り付け、前記入力軸を左右に２分割し、左分割入力軸の左端部に形成した右ねじの雄ねじ部に、左側の１次出力輪体に形成した右ねじの雌ねじ部を螺合させて、この左側の１次出力輪体を取り付け、左分割入力軸の右端部外周に形成した右ねじの雄ねじ部に、１次入力輪体に形成した右ねじの雌ねじ部を螺合させて、この１次入力輪体を取り付け、右分割入力軸の右端部近傍箇所に形成した右ねじの雄ねじ部に、右側の１次出力輪体に形成した右ねじの雌ねじ部を螺合させて、この右側の１次出力輪体を取り付け、左分割入力軸の右端部内周に形成した左ねじの雌ねじ部に、右分割入力軸の左端部外周に形成した左ねじの雄ねじ部を螺合させて、左右の分割入力軸同士を結合させたことを特徴とする。
【００１３】
この構成により、１次入力輪体や左右の１次出力輪体として、そのボス部の雌ねじ部が右ねじである標準部品を使用でき、製造コストを低減させることができる。すなわち、雌ねじ部を左ねじにした場合には特注品となって製造コストが極めて高くなるが、このようなことがない。
【００１４】
請求項２記載の発明は、上記共通構成に加えて、左右の後輪軸に、入力軸からの駆動力を入力する２次入力輪体を、それぞれ左右の後輪軸に一体的に回転するように取り付けられた輪体受けを介して、取り付けるように構成し、左側の２次入力輪体に形成した右ねじの雌ねじ部を、左側の輪体受けの右側外周に形成した右ねじの雄ねじ部に螺合させて、左側の２次入力輪体を取り付け、右側の２次入力輪体に形成した右ねじの雌ねじ部を、右側の輪体受けの左側外周に形成した右ねじの雄ねじ部に螺合させて、右側の２次入力輪体を取り付けたことを特徴とする。
【００１５】
この構成によれば、入力軸からの駆動力を入力する２次入力輪体として、そのボス部の雌ねじ部が右ねじである標準部品を使用でき、製造コストを低減させることができる。すなわち、雌ねじ部を左ねじにした場合には特注品となって製造コストが極めて高くなるが、このようなことがない。
【００２０】
請求項３記載の発明は、上記共通構成に加えて、人を乗せる後部座席が後輪間に配設され、後輪軸を、入力軸および揺動中心軸よりも前方に配設していることを特徴とする。
この構成において、運転者が乗るサドル位置から入力軸までの距離が決まっており、入力軸や揺動中心軸および後輪軸の上方に後部座席を配置した場合に、入力軸や揺動中心軸よりも前方に後輪軸が配置されているため、運転者が乗るサドル位置と後部座席とを近づけることができて、三輪自転車を前後方向にコンパクト化し易くなる。
【００２１】
請求項４記載の発明は、上記共通構成に加えて、自転車のフレームが前部フレームと後部フレームとに分割され、後部フレームは、前部フレームに連結され、前部フレームとの連結部から後方に延設された固定前後フレームと、前記固定前後フレームから両側方に延設され、入力軸および揺動中心軸を回転自在に支持する固定横フレームと、後部車体の底部をなす固定底部フレームと、揺動中心軸を中心として揺動自在に支持され、後輪軸を回転自在に支持する揺動フレームとを有し、人を乗せる後部座席を、この脚部が前記固定底部フレームに取り付けられた状態で固定し、前記後部座席と揺動フレームとの間に、サスペンション機構を介装したことを特徴とする。
【００２２】
この構成により、後部車体を安定して支持できるとともに、サスペンション機構を介して後部座席を支持できて、後輪からの振動をサスペンション機構により吸収することができる。
【００２５】
【発明の実施の形態】
以下、本発明の実施の形態について、図面に基づき説明する。なお、以下に述べる左右方向は、自転車の運転者の左右方向と同方向とする。
図１は本発明の実施の形態に係る三輪自転車の全体斜視図、図２は同三輪自転車の全体側面図、図３は同三輪自転車の後部の平面図、図４は同三輪自転車の入力軸およびその近傍箇所の部分切欠平面図、図５は同三輪自転車の左側の後輪軸およびその近傍箇所の部分切欠平面図、図６は同三輪自転車の右側の後輪軸およびその近傍箇所の部分切欠平面図、図７は同三輪自転車の後部の側面図で、図７（ａ）は外力を受けていない状態を示し、図７（ｂ）は地面から上向きの力を受けた状態を示す。
【００２６】
図１、図２に示すように、この三輪自転車は、１つの前輪１と、左右一対の後輪２と、前輪１を支持するとともにハンドル３、サドル４、前部フレーム５、ペダル６、補助駆動ユニット７などが設けられている前部車体８と、左右の後輪２間に後部座席９が配設され、後部フレーム２０を有する後部車体１０とから構成されている。また、前部フレーム５のチェーンステー５ａとバックホーク５ｂとの各後端部が前部連結板５ｃに固着されて結合されている。そして、後部車体１０の骨格部をなす後部フレーム２０前端に後部連結板１２が固着され、この後部連結板１２と前部連結板５ｃとをボルト結合させることにより、前部車体８と後部車体１０とを連結させている。
【００２７】
なお、この実施の形態では、三輪自転車は電動自転車であり、補助駆動ユニット７に内蔵された電動モータの補助駆動力を、人の踏力に加えることができるように構成されている場合を述べているが、これに限るものではなく、補助駆動ユニット７を有せず、人力だけで駆動する三輪自転車にも、以下の構成を適用可能である。また、図１における５ｄは駆動力を後部車体１０側に入力する入力チェーン１３の上部前寄り部分を覆う前部チェーンカバー、１４は、後部フレーム２０の一部をなす固定前後フレーム１１の上方に取り付けられて入力チェーン１３の上部後方側を覆う後部チェーンカバーである。
【００２８】
図２、図３に示すように、後部フレーム２０は、後部車体１０の幅方向中央箇所下部において前後方向に延びるように配設されている固定前後フレーム１１と、左右に延設され、固定前後フレーム１１の前後方向略中央位置の上辺部に固着された固定横フレーム１５と、固定前後フレーム１１の下辺部における前後方向の前端部位置と後端部位置とに固着されて、後部座席９の底面を支持する固定底部フレーム１６と、後述する揺動フレーム２９とから構成されている。そして、この固定底部フレーム１６における後部寄り箇所に、後部座席９の椅子の脚部９ａが取り付けられた状態で、後部座席９が固定されている。後部座席９には、座部９ｂや背あて部９ｃ、下カバー部９ｄが設けられており、また、固定底部フレーム１６の前側部分の上面には、足載せ台９ｆが固着されている。この足載せ台９ｆは、後輪軸２３よりも低い位置に取り付けられており、このように足載せ台９ｆを低い位置に配置することで、乗車し易くなり、利便性が向上するように図られている。さらに、後部座席９を両側方および後方から覆う後部車体カバー１７が固定底部フレーム１６に取り付けられており、後部車体カバー１７の上部側面には、折畳式の幌屋根１８が取り付けられている。
【００２９】
図３に示すように、固定横フレーム１５の幅方向中央部には入力軸支持ブラケット２２が固着されており、この入力軸支持ブラケット２２は、左右一対の後輪２側へ伝達する駆動力、すなわちペダル６からの踏力および補助駆動ユニット７の補助駆動力が入力チェーン１３を介して入力される入力軸２１を回転自在に支持している。固定横フレーム１５の両側部寄り箇所、すなわち、入力軸支持ブラケット２２の両側方箇所には、揺動中心軸支持ブラケット２５がそれぞれ固着されており、これらの揺動中心軸支持ブラケット２５は、後輪軸２３を揺動自在に支持する揺動中心軸２４を回転自在に支持している。ここで、これらの入力軸支持ブラケット２２と揺動中心軸支持ブラケット２５とにより、入力軸２１の軸心２１ａと揺動中心軸２４の軸心２１ａとが側面から見て同じ位置となる、同軸心位置に配設されて支持されている。また、この実施の形態では、入力軸支持ブラケット２２と揺動中心軸支持ブラケット２５とが固定横フレーム１５から後方に延びた姿勢で固着されている。
【００３０】
入力軸２１には、その幅方向中央寄り位置に、入力チェーン１３からの駆動力を入力する１次入力ギヤ２６が取り付けられ、また、入力軸２１の両側部には、入力軸２１の駆動力を出力する駆動側伝達輪体としての左右の１次出力ギヤ２７Ａ、２７Ｂが入力軸２１と一体的に回転するように取り付けられている。ここで、１次入力ギヤ２６は、ラッチ機構などからなる一方向クラッチが内蔵されたフリーギヤで構成されている。そして、入力チェーン１３が前進方向に駆動されて１次入力ギヤ２６の上部側が前側に移動するように回転される場合には、この駆動力を入力軸２１に伝達するが、入力チェーン１３が後退方向に駆動された場合や、１次入力ギヤ２６が停止した状態で、入力軸２１の上部が前側に回転するなど、１次入力ギヤ２６よりも入力軸２１が相対的に前進方向に回転することが、許容されるようになっている。
【００３１】
揺動中心軸２４には、後輪軸受２８を介して、後輪軸２３を回転自在に支持する揺動フレーム２９が、揺動中心軸２４を中心として揺動自在に組みつけられ、この揺動フレーム２９により左右の後輪軸２３が連結されている。
【００３２】
左右の後輪軸２３における１次出力ギヤ２７Ａ、２７Ｂに対応する位置には、従動側伝達輪体としての２次ギヤ３０Ａ、３０Ｂがそれぞれ取り付けられ、これらの１次出力ギヤ２７Ａ、２７Ｂと２次ギヤ３０Ａ、３０Ｂとにわたって、無端状体としての伝達チェーン３１が掛け渡されている。ここで、左右の２次ギヤ３０Ａ、３０Ｂは、一方向クラッチが内蔵されたフリーギヤで構成され、左右の２次ギヤ３０Ａ、３０Ｂの上部側が前側に回転される場合など、後輪軸２３に対して２次ギヤ３０Ａ、３０Ｂが前進方向に回転する場合には、この駆動力を後輪軸２３に伝達するが、例えば、２次ギヤ３０Ａ、３０Ｂが停止した状態で、後輪軸２３の上部が前側に回転するなど、２次ギヤ３０Ａ、３０Ｂよりも後輪軸２３が相対的に前進方向に回転することが、許容されるようになっている。
【００３３】
さらに、後部車体１０に設けられている全てのギヤ、すなわち、１次入力ギヤ２６、左右の１次出力ギヤ２７Ａ、２７Ｂ、左右の２次ギヤ３０Ａ、３０Ｂは、そのボス部に形成された雌ねじ部２６ａ，２７ａ，２７ｂ，３０ａ，３０ｂが全て右ねじである標準部品が用いられている。
【００３４】
すなわち、図４に示すように、入力軸２１の左端部は、その端部に右ねじの雄ねじ部２１ａが形成されているとともにその内側に鍔部２１ｂが形成された一般的な、ねじ取付構造とされ、入力軸２１が前進方向（ａ方向）に回転することにより、左の１次出力ギヤ２７Ａが鍔部２１ｂ側に押し付けられて、いわゆる締め付け方向に規制されて位置決めされるようになっている。
【００３５】
一方、入力軸２１における１次入力ギヤ２６が取り付けられる箇所では、入力軸２１が左右に２分割されており、左分割入力軸２１Ａの右端部外周に右ねじの雄ねじ部２１ｃが形成され、この雄ねじ部２１ｃに、１次入力ギヤ２６のボス部に形成された右ねじの雌ねじ部２６ａが螺合されて、１次入力ギヤ２６が前進方向（ａ方向）に回転することにより、１次入力ギヤ２６が、雄ねじ部２１ｃの内側に形成された鍔部２１ｄ側に押し付けられて、いわゆる締め付け方向に規制されて位置決めされるようになっている。
【００３６】
また、左分割入力軸２１Ａの右端内周には左ねじからなる雌ねじ部２１ｅが形成され、この雌ねじ部２１ｅに、右分割入力軸２１Ｂの左端外周に形成された左ねじの雄ねじ部２１ｆが螺合されており、左分割入力軸２１Ａが前進方向（ａ方向）に回転することにより、右分割入力軸２１Ｂが左分割入力軸２１Ａに締め付けられた状態で位置決め固定されるようになっている。
【００３７】
また、右分割入力軸２１Ｂは、左端の雄ねじ部２１ｆが最も小径で、右側ほど太径の段付き形状に形成され、右端に最も太径の鍔部２１ｇが形成されており、その内側に右ねじからなる雄ねじ部２１ｈが形成されている。そして、右分割入力軸２１Ｂが左分割入力軸２１Ａに組みつけられる前に、右の１次出力ギヤ２７Ｂが右分割入力軸２１Ｂの左側部分から入れられ、右の１次出力ギヤ２７Ｂの右雌ねじ部２７ｂが、右分割入力軸２１Ｂにおける右端近傍の右ねじの雄ねじ部２１ｈに螺合されており、右分割入力軸２１Ｂが前進方向（ａ方向）に回転することにより、右の１次出力ギヤ２７Ｂが右分割入力軸２１Ｂの右端に形成された鍔部２１ｇ側に押し付けられて、いわゆる締め付け方向に規制されて位置決めされるようになっている。
【００３８】
また、図５に示すように、左の後輪軸２３の右端部には、２次入力ギヤ３０Ａを取り付けるためのフリーギヤ受け３５が、左の後輪軸２３と一体的に回転するように取り付けられており、このフリーギヤ受け３５の右側外周に右ねじの雄ねじ部３５ａが形成され、この左側に雄ねじ部３５ａよりも大径の鍔部３５ｂが形成されている。そして、フリーギヤ受け３５の雄ねじ部３５ａに、フリーギヤからなる左の２次ギヤ３０Ａの右ねじの雌ねじ部３０ａが螺合されて、左の２次ギヤ３０Ａが前進方向（ａ方向）に回転することにより、この２次入力ギヤ３０Ａが、フリーギヤ受け３５の鍔部３５ｂ側に押し付けられて、いわゆる締め付け方向に規制されて位置決めされるようになっている。なお、図５における３６は、２次入力ギヤ３０Ａがフリーギヤ受け３５から脱落することを防止するシャフトストッパである。
【００３９】
さらに、図６に示すように、右の後輪軸２３の左端部には、２次入力ギヤ３０Ｂを取り付けるためのフリーギヤ受け３７が、右の後輪軸２３と一体的に回転するように取り付けられており、このフリーギヤ受け３７の右側外周に右ねじの雄ねじ部３７ａが形成され、この左側に雄ねじ部３７ａよりも大径の鍔部３７ｂが形成されている。そして、フリーギヤ受け３７の雄ねじ部３７ａに、フリーギヤからなる右の２次ギヤ３０Ｂの右ねじの雌ねじ部３０ｂが螺合されて、右の２次ギヤ３０Ｂが前進方向（ａ方向）に回転することにより、この２次入力ギヤ３０Ｂが、フリーギヤ受け３７の鍔部３７ｂ側に押し付けられて、いわゆる締め付け方向に規制されて位置決めされるようになっている。
【００４０】
また、図７に示すように、揺動フレーム２９の後端部と、後部座席９の座部９ｂを支持する座部支持フレーム９ｇとの間には、サスペンションばね３２を備えたサスペンション機構３３が介装されている。そして、後輪２が地面から受けた振動が、前記サスペンション機構３３により吸収される状態で、後部座席９が支持されている。なお、３４は後輪用のディスクブレーキ装置である。
【００４１】
上記構成によれば、後部座席９がサスペンション機構３３で受けられた状態で後部車体１０に支持されているので、三輪自転車を走行させた際に、地面から後輪２に振動を受けた場合でも、この振動が、サスペンション機構３３で吸収され、後部座席９に載った利用者の乗り心地が良好となる。
【００４２】
そして、このようにサスペンション機構３３を装着して、利用者の乗り心地を向上させることができながら、入力軸２１と揺動中心軸２４とが同軸心に配設されているため、後輪２が揺動中心軸２４を中心として揺動した場合でも、図７（ａ）、（ｂ）に示すように、入力軸２１に取り付けた１次出力ギヤ２７Ａ、２７Ｂと、後輪軸２３に取り付けた２次ギヤ３０Ａ、３０Ｂとの距離が変化せずに一定であり、この結果、これらの１次出力ギヤ２７Ａ、２７Ｂと２次ギヤ３０Ａ、３０Ｂとを連動させる伝達チェーン３１の距離変動を吸収するためのチェーンテンショナーなどの機構が不要となり、その分だけ製造コストを低減させることができる。
【００４３】
また、左右の分割入力軸２１Ａ、２１Ｂを連結するねじ部分は左ねじであるため、この部分の製造コストについては若干の製造コストの上昇を招くものの、後部車体１０に設けられている全てのギヤ、すなわち、１次入力ギヤ２６、左右の１次出力ギヤ２７Ａ、２７Ｂ、左右の２次ギヤ３０Ａ、３０Ｂは、そのボス部に形成された雌ねじ部２６ａ，２７ａ，２７ｂ，３０ａ，３０ｂが全て右ねじである標準部品が用いられているため、総合的には、製造コストを低減させることができる。すなわち、ギヤの雌ねじ部を左ねじにした場合には特注品となって製造コストが極めて高くなるが、このようなことがない。
【００４４】
また、自転車のフレームが前部フレーム５と後部フレーム２０とに分割され、これらの前部フレーム５と後部フレーム２０とが結合されて組み付けられているので、この三輪自転車を前部フレーム５と後部フレーム２０とに分割して運搬することが可能となり、フレームが前後に分割されていないものと比較して、運搬を容易に行うことができる。
【００４５】
また、上記構成によれば、入力軸２１や揺動中心軸２４よりも後方に後輪軸２３を配置しているため、運転者が乗るサドル４位置から入力軸２１までの距離を所定距離に決めた場合に、運転者が乗るサドル４位置と後部座席９との間に、後部座席９に対して人が乗り降りするスペースを取り易くなり、利便性が向上する。さらに、後部座席９に設けられた足載せ台９ｆが、後輪軸２３よりも下方に配置されているので、足載せ台９ｆを低い位置に配置できて、乗車し易くなる。
【００４６】
また、この構成により、後部車体１０を安定して支持できるとともに、サスペンション機構３３を介して後部座席９を支持しているので、後輪２からの振動をサスペンション機構３３により吸収することができ、乗り心地が良好となる。また、１次入力ギヤ２６や２次ギヤ３０Ａ、３０Ｂとしてフリーギヤを用いて、左右の後輪２が差動できる構造としたので、走行時の回転半径を小さくすることができるとともに、曲がって走行する際などに、片方の後輪２が地面に対して空回りしなくて済んで、耐久性が向上する。
【００４７】
なお、上記実施の形態においては、入力軸２１や揺動中心軸２４よりも後方に後輪軸２３を配置した場合を述べたが、これに限るものではなく、後輪軸２３を入力軸２１や揺動中心軸２４よりも前方に配置してもよい。この場合は、運転者が乗るサドル位置と後部座席９との間の人が乗り降りするスペースが狭くなる欠点があるものの、後輪軸２３や後部座席９を前寄りに配置しやすくなって、三輪自転車を前後方向にコンパクト化し易くなる。さらに、上記図３などに示す、揺動中心軸２４を省いて、揺動中心軸支持ブラケット２５を後方まで延設し、この揺動中心軸支持ブラケット２５により後輪軸２３自体を回動自在に支持するように構成してもよい。
【００４８】
また、上記実施の形態では、駆動側伝達輪体や従動側伝達輪体としてギヤ２７Ａ、２７Ｂ、３０Ａ、３０Ｂを用い、無端状体として伝達チェーン３１を用いた場合を述べたが、これに限るものではなく、プーリやベルトを用いることもできる。また、直接ギヤ同士を噛み合わせることも可能であるが、この場合には、ギヤ間の距離があまり離れていない場合に限られる。
【００４９】
【発明の効果】
以上のように本発明によれば、左右一対の後輪側へ伝達する駆動力が入力される入力軸と、後輪軸を揺動自在に支持する揺動中心軸とを、同軸心に配設したことにより、後輪が揺動中心軸を中心として揺動するようにサスペンション機構を装着することができながら、伝達輪体間の相対位置の距離変動を吸収するための機構が不要となり、製造コストを低減させることができる。
【００５０】
また、入力軸を左右に２分割し、左分割入力軸の左端部に形成した右ねじの雄ねじ部に、左側の１次出力輪体に形成した右ねじの雌ねじ部を螺合させ、左分割入力軸の右端部外周に形成した右ねじの雄ねじ部に、１次入力輪体に形成した右ねじの雌ねじ部を螺合させ、右分割入力軸の右端部近傍箇所に形成した右ねじの雄ねじ部に、右側の１次出力輪体に形成した右ねじの雌ねじ部を螺合させ、左分割入力軸の右端部内周に形成した左ねじの雌ねじ部に、右分割入力軸の左端部外周に形成した左ねじの雄ねじ部を螺合させることで、１次入力輪体や１次出力輪体として、そのボス部の雌ねじ部が右ねじである標準部品を使用でき、製造コストを低減させることができる。
【００５１】
また、左右の後輪軸に、入力軸からの駆動力を入力する２次入力輪体を、それぞれ左右の後輪軸に一体的に回転するように取り付けられた輪体受けを介して、取り付けるように構成し、左側の２次入力輪体に形成した右ねじの雌ねじ部を、左側の輪体受けの右側外周に形成した右ねじの雄ねじ部に螺合させ、右側の２次入力輪体に形成した右ねじの雌ねじ部を、右側の輪体受けの左側外周に形成した右ねじの雄ねじ部に螺合させることで、入力軸からの駆動力を入力する２次入力輪体も、そのボス部の雌ねじ部が右ねじである標準部品を使用でき、製造コストをさらに低減させることができる。
【００５３】
また、後輪軸を、入力軸および揺動中心軸よりも前方に配設することで、運転者が乗るサドル位置と後部座席とを近づけることができて、三輪自転車を前後方向にコンパクト化し易くなる。
【００５４】
また、人を乗せる後部座席と揺動フレームとの間に、サスペンション機構を介装することで、後輪からの振動をサスペンション機構により吸収することができて、乗り心地を向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る三輪自転車の全体斜視図である。
【図２】同三輪自転車の全体側面図である。
【図３】同三輪自転車の後部の平面図である。
【図４】同三輪自転車の入力軸およびその近傍箇所の部分切欠平面図である。
【図５】同三輪自転車の左側の後輪軸およびその近傍箇所の部分切欠平面図である。
【図６】同三輪自転車の右側の後輪軸およびその近傍箇所の部分切欠平面図である。
【図７】同三輪自転車の後部の側面図で、（ａ）は外力を受けていない状態を示し、（ｂ）は地面から上向きの力を受けた状態を示す。
【図８】従来の三輪自転車の後輪駆動装置の斜視図である。
【符号の説明】
１前輪
２後輪
４サドル
５前部フレーム
５ｃ前部連結板
６ペダル
７補助駆動ユニット
８前部車体
９後部座席
９ｆ足載せ台
９ｇ座部支持フレーム
１０後部車体
１１固定前後フレーム
１２後部連結板
１３入力チェーン
１５固定横フレーム
１６固定底部フレーム
２０後部フレーム
２１入力軸
２１ａ，２１ｃ，２１ｈ，２１ｆ，３５ａ，３７ａ雄ねじ部
２１ｂ，２１ｄ，２１ｇ，３５ｂ，３７ｂ鍔部
２１Ａ左分割入力軸
２１Ｂ右分割入力軸
２２入力軸支持ブラケット
２３後輪軸
２４揺動中心軸
２５揺動中心軸支持ブラケット
２６１次入力ギヤ
２１ｅ，２６ａ，２７ａ，２７ｂ，３０ａ，３０ｂ雌ねじ部
２７Ａ、２７Ｂ１次出力ギヤ
２８後輪軸受
２９揺動フレーム
３０Ａ、３０Ｂ２次ギヤ
３１伝達チェーン（無端状体）
３２サスペンションばね
３３サスペンション機構
３５，３７フリーギヤ受け[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tricycle.
[0002]
[Prior art]
A three-wheeled bicycle with a pair of left and right rear wheels at the rear of the vehicle has the advantage of being able to maintain a stable standing posture even when stopped or at a low speed, compared to a general two-wheeled bicycle. In addition, there is an advantage that it is possible to install a loading platform for loading luggage and a rear seat for loading people.
[0003]
As a technique related to this type of three-wheel bicycle, Patent Document 1 discloses a rear-wheel drive device for a three-wheel bicycle. As shown in FIG. 8, this three-wheeled bicycle rear wheel drive device has rear wheel gears 51 that rotate integrally on the same axis on the inner side surfaces of a pair of left and right rear wheels 50, respectively. An input shaft 54 for inputting a driving force from the front side of the vehicle body via the input chain 52 and the input gear 53 is disposed above a shaft (referred to as a rear wheel shaft) 57 of the rear wheel gear 51. In this structure, a drive gear 55 attached to both sides of the rear wheel 54 and the rear wheel gear 51 are connected by a transmission chain 56.
[0004]
The support structure for the rear wheel 50 and the rear wheel gear 51 and the support structure for the drive gear 55 are not specifically described in Patent Document 1, but the rear wheel shaft 57 and the input are provided by a frame provided at the rear of the vehicle body. It is considered that the shaft 54 is configured to be supported at a predetermined fixed position.
[0005]
According to this rear wheel drive device, the left and right rear wheels 50 are allowed to rotate differently by adopting a free gear structure incorporating a one-way clutch as the input gear 53 or the drive gear 55 on one side. Compared to the structure in which the left and right rear wheels are coupled and rotated integrally with a single axle, the turning radius during travel can be reduced.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 6-32290
[0007]
[Problems to be solved by the invention]
However, since the structure of Patent Document 1 supports the rear wheel shaft 57 and the input shaft 54 at predetermined fixed positions, the rear wheel shaft 57 and the input shaft 54 are supported at predetermined positions by the rear support frame. At the same time, when a rear seat on which a person rides is attached to the rear support frame, the vibration received by the rear wheel 50 from the ground is directly transmitted to the rear seat, and the ride comfort becomes extremely poor.
[0008]
As a method for dealing with this, it is conceivable that the rear wheel shaft 57 is supported by a suspension mechanism, and the vibration received by the rear wheel 50 from the ground is absorbed by the suspension mechanism. However, in this case, since the relative position between the rear wheel shaft 57 and the input shaft 54 varies during traveling of the three-wheeled bicycle, a mechanism for absorbing the distance variation between these relative positions is separately required. When the rear wheel shaft 57 and the input 54 are connected by the transmission chain 56 or the like, it is necessary to provide a chain tensioner or the like, resulting in an increase in manufacturing cost.
[0009]
The present invention solves the above-mentioned problem, and it is possible to minimize the transmission of vibration from the rear wheel to the rear seat, but without providing a mechanism for absorbing the fluctuation of the inter-axis distance with respect to the rear wheel shaft. The purpose is to provide a three-wheeled bicycle that can be used.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, claim 1 of the present invention. ~ 4 Tricycle described in Common configurations Includes an input shaft to which a driving force transmitted to the pair of left and right rear wheels is input, a swinging center shaft that swingably supports the rear wheel shaft, and a pair of left and right drive side transmission wheels attached to the input shaft. And a left and right driven side transmission wheel body that is attached to the rear wheel shaft and transmits the driving force from the drive side transmission wheel body through an endless body or directly, and the input shaft The swing center axis is coaxially disposed.
[0011]
With this configuration, the suspension mechanism can be mounted so that the rear wheel swings about the swing center axis, but the input shaft and the swing center axis are arranged coaxially. Even when the motor swings around the swing center axis, the distance between the drive side transmission wheel attached to the input shaft and the driven side transmission wheel attached to the rear wheel shaft remains constant without change. As a result, it is possible to absorb the distance fluctuation of the relative position between these transmission wheels in any case where these transmission wheels are linked via an endless body or when the transmission wheels are linked directly. This eliminates the need for a mechanism for reducing the manufacturing cost.
[0012]
Claim 1 The invention described is In addition to the common configuration above, The input shaft is attached with one primary input wheel body that inputs driving force to the input shaft and two primary output wheel bodies that output driving force from the input shaft, and the input shaft is divided into left and right parts. Then, the left-hand primary output ring is mounted by screwing the right-hand female thread formed on the left primary output ring into the right-hand male thread formed on the left end of the left split input shaft. The right-handed male threaded part formed on the primary input ring is screwed into the right-handed male threaded part formed on the outer periphery of the right end of the left divided input shaft. A right-handed female threaded part formed on the right-side primary output ring is screwed into a right-handed male threaded part formed near the right end of the shaft, and the right-side primary output wheeled body is attached to the left split. Left-hand thread formed on the outer periphery of the left end of the right split input shaft on the female thread portion of the left-hand thread formed on the inner periphery of the right end of the input shaft By screwing the male screw portion, characterized in that to bind the left and right divided input axes.
[0013]
With this configuration, standard parts in which the internal thread portion of the boss portion is a right-hand thread can be used as the primary input wheel body and the left and right primary output wheel bodies, and the manufacturing cost can be reduced. That is, when the female thread portion is a left-hand thread, it becomes a custom-made product and the manufacturing cost is extremely high, but this is not the case.
[0014]
Claim 2 The invention described is In addition to the common configuration above, The secondary input wheel body for inputting the driving force from the input shaft to the left and right rear wheel shafts is configured to be mounted via the wheel body receivers that are mounted to rotate integrally with the left and right rear wheel shafts. The right-handed female threaded part formed on the left secondary input ring is screwed into the right-handed male threaded part formed on the right outer periphery of the left-hand ring body, and the left secondary input wheel is attached. The right-hand side secondary input ring body is attached by screwing the right-hand thread part of the right-hand thread formed on the right-side secondary input wheel body into the right-hand thread part of the right-hand thread formed on the left outer periphery of the right-side wheel body receiver. It is characterized by.
[0015]
According to this configuration, a standard component in which the female thread portion of the boss portion is a right-hand thread can be used as the secondary input ring body for inputting the driving force from the input shaft, and the manufacturing cost can be reduced. That is, when the female thread portion is a left-hand thread, it becomes a custom-made product and the manufacturing cost is extremely high, but this is not the case.
[0020]
Claim 3 The invention described is In addition to the above common configuration, a rear seat for carrying a person is disposed between the rear wheels, The rear wheel shaft is arranged in front of the input shaft and the swing center shaft.
In this configuration, the distance from the saddle position where the driver rides to the input shaft is determined, and when the rear seat is arranged above the input shaft, the swing center shaft, and the rear wheel shaft, the distance from the input shaft or the swing center shaft In addition, since the rear wheel axle is disposed in front, the saddle position where the driver rides can be brought close to the rear seat, and the three-wheeled bicycle can be easily made compact in the front-rear direction.
[0021]
Claim 4 The invention described is In addition to the common configuration above, The bicycle frame is divided into a front frame and a rear frame. The rear frame is connected to the front frame, and extends from the connecting portion with the front frame to the rear, and the fixed front and rear frames. A fixed lateral frame extending on both sides and rotatably supporting the input shaft and the swing center shaft, a fixed bottom frame forming the bottom of the rear vehicle body, and swingably supported about the swing center axis; A swing frame that rotatably supports the rear wheel axle, and a rear seat on which a person is placed is fixed with the legs attached to the fixed bottom frame, and the rear seat is fixed between the swing seat and the rear seat. Further, a suspension mechanism is interposed.
[0022]
With this configuration, the rear vehicle body can be stably supported, the rear seat can be supported via the suspension mechanism, and vibrations from the rear wheels can be absorbed by the suspension mechanism.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The left-right direction described below is the same as the left-right direction of the bicycle driver.
1 is an overall perspective view of a tricycle according to an embodiment of the present invention, FIG. 2 is an overall side view of the tricycle, FIG. 3 is a plan view of the rear of the tricycle, and FIG. 4 is an input shaft of the tricycle. 5 is a partially cutaway plan view of the left side of the three-wheel bicycle and a partially cutaway plan view of the vicinity thereof, and FIG. 6 is a partially cutaway plan view of the right rear wheel shaft of the three-wheel bicycle and the vicinity thereof. FIGS. 7 and 7 are side views of the rear portion of the three-wheeled bicycle. FIG. 7A shows a state where no external force is received, and FIG. 7B shows a state where an upward force is received from the ground.
[0026]
As shown in FIGS. 1 and 2, this three-wheeled bicycle supports one front wheel 1, a pair of left and right rear wheels 2, a front wheel 1 and a handle 3, saddle 4, front frame 5, pedal 6, auxiliary The vehicle includes a front vehicle body 8 provided with a drive unit 7 and the like, and a rear vehicle body 10 having a rear frame 20 provided with a rear seat 9 between the left and right rear wheels 2. The rear ends of the chain stay 5a and the back fork 5b of the front frame 5 are fixedly coupled to the front connection plate 5c. Then, the rear connecting plate 12 is fixed to the front end of the rear frame 20 forming the skeleton of the rear vehicle body 10, and the front vehicle body 8 and the rear vehicle body 10 are connected by bolting the rear connecting plate 12 and the front connecting plate 5c. Are connected.
[0027]
In this embodiment, the three-wheeled bicycle is an electric bicycle, and a case is described in which the auxiliary driving force of the electric motor built in the auxiliary driving unit 7 can be applied to the pedaling force of a person. However, the present invention is not limited to this, and the following configuration can also be applied to a three-wheeled bicycle that does not have the auxiliary drive unit 7 and is driven only by human power. Further, 5d in FIG. 1 is a front chain cover that covers an upper front portion of the input chain 13 that inputs driving force to the rear vehicle body 10 side, and 14 is above the fixed front and rear frame 11 that forms a part of the rear frame 20. A rear chain cover that is attached and covers the upper rear side of the input chain 13.
[0028]
As shown in FIGS. 2 and 3, the rear frame 20 includes a fixed front and rear frame 11 disposed to extend in the front-rear direction at a lower portion of the center portion in the width direction of the rear vehicle body 10, and extends in the left and right directions. The fixed horizontal frame 15 fixed to the upper side of the frame 11 at the substantially central position in the front-rear direction and the front end position and the rear end position in the front-rear direction at the lower side of the fixed front and rear frame 11 are fixed to the rear seat 9. It is composed of a fixed bottom frame 16 that supports the bottom surface and a swing frame 29 described later. Then, the rear seat 9 is fixed to a position closer to the rear portion of the fixed bottom frame 16 in a state where the leg portion 9a of the chair of the rear seat 9 is attached. The rear seat 9 is provided with a seat portion 9b, a backrest portion 9c, and a lower cover portion 9d, and a footrest 9f is fixed to the upper surface of the front portion of the fixed bottom frame 16. The footrest 9f is attached at a position lower than the rear wheel shaft 23. By arranging the footrest 9f at a lower position in this way, it is easy to get on and the convenience is improved. ing. Further, a rear vehicle body cover 17 that covers the rear seat 9 from both sides and rear is attached to the fixed bottom frame 16, and a foldable hood roof 18 is attached to the upper side surface of the rear vehicle body cover 17.
[0029]
As shown in FIG. 3, an input shaft support bracket 22 is fixed to the central portion in the width direction of the fixed horizontal frame 15, and the input shaft support bracket 22 transmits a driving force transmitted to the pair of left and right rear wheels 2, That is, the input shaft 21 to which the pedaling force from the pedal 6 and the auxiliary driving force of the auxiliary driving unit 7 are input via the input chain 13 is rotatably supported. Oscillation center axis support brackets 25 are respectively fixed to positions on both sides of the fixed horizontal frame 15, that is, on both sides of the input axis support bracket 22, and these oscillation center axis support brackets 25 A swinging center shaft 24 that rotatably supports the wheel shaft 23 is rotatably supported. Here, the input shaft support bracket 22 and the swing center shaft support bracket 25 allow the shaft center 21a of the input shaft 21 and the shaft center 21a of the swing center shaft 24 to be in the same position when viewed from the side. It is arranged and supported at the center position. In this embodiment, the input shaft support bracket 22 and the swing center shaft support bracket 25 are fixed in a posture extending rearward from the fixed lateral frame 15.
[0030]
A primary input gear 26 for inputting a driving force from the input chain 13 is attached to the input shaft 21 at a position closer to the center in the width direction, and the driving force of the input shaft 21 is provided on both sides of the input shaft 21. Left and right primary output gears 27 A and 27 B serving as drive-side transmission wheels that output the motor are attached to rotate integrally with the input shaft 21. Here, the primary input gear 26 is composed of a free gear with a built-in one-way clutch composed of a latch mechanism or the like. When the input chain 13 is driven in the forward direction and rotated so that the upper side of the primary input gear 26 moves to the front side, this driving force is transmitted to the input shaft 21, but the input chain 13 moves backward. The input shaft 21 rotates in the forward direction relative to the primary input gear 26, such as when the upper part of the input shaft 21 rotates forward when the primary input gear 26 is stopped. Is allowed.
[0031]
A swing frame 29 that rotatably supports the rear wheel shaft 23 via a rear wheel bearing 28 is assembled to the swing center shaft 24 so as to be swingable about the swing center shaft 24. The left and right rear wheel shafts 23 are connected by a frame 29.
[0032]
Secondary gears 30A and 30B as driven transmission wheels are attached to positions on the left and right rear wheel shafts 23 corresponding to the primary output gears 27A and 27B, respectively, and these primary output gears 27A and 27B and secondary gears are respectively attached. A transmission chain 31 as an endless body is stretched over the gears 30A and 30B. Here, the left and right secondary gears 30A and 30B are constituted by free gears with built-in one-way clutches, and the upper side of the left and right secondary gears 30A and 30B is rotated forward, for example, with respect to the rear wheel shaft 23. When the secondary gears 30A and 30B rotate in the forward direction, this driving force is transmitted to the rear wheel shaft 23. For example, when the secondary gears 30A and 30B are stopped, the upper portion of the rear wheel shaft 23 is moved forward. For example, the rear wheel shaft 23 is allowed to rotate in the forward direction relative to the secondary gears 30A and 30B.
[0033]
Furthermore, all the gears provided in the rear body 10, that is, the primary input gear 26, the left and right primary output gears 27 A and 27 B, and the left and right secondary gears 30 A and 30 B are internally threaded on the bosses. Standard parts in which the parts 26a, 27a, 27b, 30a, 30b are all right-hand threads are used.
[0034]
That is, as shown in FIG. 4, the left end portion of the input shaft 21 has a general screw mounting structure in which a male screw portion 21a of a right-hand thread is formed at the end portion and a flange portion 21b is formed inside thereof. When the input shaft 21 rotates in the forward direction (direction a), the left primary output gear 27A is pressed against the flange portion 21b and is positioned in a so-called tightening direction. Yes.
[0035]
On the other hand, at the place where the primary input gear 26 is attached to the input shaft 21, the input shaft 21 is divided into left and right parts, and a right-handed male screw part 21c is formed on the outer periphery of the right end part of the left divided input shaft 21A. A right-handed female screw portion 26a formed on the boss portion of the primary input gear 26 is screwed into the male screw portion 21c, and the primary input gear 26 rotates in the forward direction (direction a), thereby performing the primary input. The gear 26 is pressed against the flange portion 21d formed inside the male screw portion 21c and is positioned in a so-called tightening direction.
[0036]
A female screw portion 21e made of a left screw is formed on the inner periphery of the right end of the left divided input shaft 21A, and a male screw portion 21f of a left screw formed on the outer periphery of the left end of the right divided input shaft 21B is screwed into the female screw portion 21e. The left divided input shaft 21A rotates in the forward direction (direction a), so that the right divided input shaft 21B is positioned and fixed while being clamped to the left divided input shaft 21A.
[0037]
Further, the right split input shaft 21B has a stepped shape in which the male screw portion 21f at the left end has the smallest diameter and the diameter increases toward the right, and the thickest flange portion 21g is formed at the right end. A male screw portion 21h made of a screw is formed. Before the right divided input shaft 21B is assembled to the left divided input shaft 21A, the right primary output gear 27B is inserted from the left side portion of the right divided input shaft 21B, and the right female screw of the right primary output gear 27B is inserted. The portion 27b is screwed into a right-hand male screw portion 21h in the vicinity of the right end of the right split input shaft 21B, and the right split input shaft 21B rotates in the forward direction (direction a), whereby the right primary output gear 27B is pressed against the flange portion 21g formed on the right end of the right split input shaft 21B, and is positioned in a so-called tightening direction.
[0038]
As shown in FIG. 5, a free gear receiver 35 for attaching the secondary input gear 30 A is attached to the right end portion of the left rear wheel shaft 23 so as to rotate integrally with the left rear wheel shaft 23. A right-handed male threaded portion 35a is formed on the right outer periphery of the free gear receiver 35, and a flange 35b having a larger diameter than the male threaded portion 35a is formed on the left-hand side. Then, the female screw portion 30a of the right secondary screw 30A made of a free gear is screwed into the male screw portion 35a of the free gear receiver 35, and the left secondary gear 30A rotates in the forward direction (direction a). Thus, the secondary input gear 30A is pressed against the flange 35b side of the free gear receiver 35 and is positioned in a so-called tightening direction. Note that reference numeral 36 in FIG. 5 denotes a shaft stopper that prevents the secondary input gear 30 A from falling off the free gear receiver 35.
[0039]
Further, as shown in FIG. 6, a free gear receiver 37 for attaching the secondary input gear 30 B is attached to the left end portion of the right rear wheel shaft 23 so as to rotate integrally with the right rear wheel shaft 23. A right-handed male threaded portion 37a is formed on the right outer periphery of the free gear receiver 37, and a flange 37b having a larger diameter than the male threaded portion 37a is formed on the left-hand side. Then, the female screw portion 30b of the right secondary gear 30B made of a free gear is screwed into the male screw portion 37a of the free gear receiver 37, and the right secondary gear 30B rotates in the forward direction (direction a). Thus, the secondary input gear 30B is pressed against the flange 37b side of the free gear receiver 37 and is positioned in a so-called tightening direction.
[0040]
Further, as shown in FIG. 7, a suspension mechanism 33 including a suspension spring 32 is provided between the rear end portion of the swing frame 29 and the seat portion support frame 9 g that supports the seat portion 9 b of the rear seat 9. It is intervened. The rear seat 9 is supported in a state where the vibration received by the rear wheel 2 from the ground is absorbed by the suspension mechanism 33. Reference numeral 34 denotes a rear wheel disc brake device.
[0041]
According to the above configuration, since the rear seat 9 is supported by the rear vehicle body 10 while being received by the suspension mechanism 33, even when the rear wheel 2 receives vibration from the ground when the three-wheeled bicycle is run. This vibration is absorbed by the suspension mechanism 33, and the riding comfort of the user who is placed on the rear seat 9 is improved.
[0042]
Since the suspension mechanism 33 is mounted in this way and the riding comfort of the user can be improved, the input shaft 21 and the swinging central shaft 24 are arranged coaxially, so that the rear wheel 2 7A and 7B, the primary output gears 27A and 27B attached to the input shaft 21 and the rear wheel shaft 23 are attached to the rear wheel shaft 23 as shown in FIGS. The distance between the secondary gears 30A and 30B is constant without changing, and as a result, the distance fluctuation of the transmission chain 31 that links the primary output gears 27A and 27B and the secondary gears 30A and 30B is absorbed. Therefore, a mechanism such as a chain tensioner is not required, and the manufacturing cost can be reduced accordingly.
[0043]
Further, since the screw portion connecting the left and right divided input shafts 21A and 21B is a left-hand screw, although the manufacturing cost of this portion causes a slight increase in manufacturing cost, all the gears provided in the rear vehicle body 10 That is, in the primary input gear 26, the left and right primary output gears 27A and 27B, and the left and right secondary gears 30A and 30B, the female screw portions 26a, 27a, 27b, 30a, and 30b formed on the boss portions are all right. Since standard parts that are screws are used, the manufacturing cost can be reduced overall. That is, when the female thread portion of the gear is a left-hand thread, it becomes a custom-made product and the manufacturing cost becomes extremely high, but this does not occur.
[0044]
In addition, the bicycle frame is divided into a front frame 5 and a rear frame 20, and these front frame 5 and rear frame 20 are combined and assembled. It becomes possible to carry it by dividing it into the frame 20, and it can be carried easily as compared with the case where the frame is not divided into front and rear.
[0045]
Further, according to the above configuration, since the rear wheel shaft 23 is arranged behind the input shaft 21 and the swinging central shaft 24, the distance from the saddle 4 position where the driver rides to the input shaft 21 is determined as a predetermined distance. In this case, it becomes easier for a person to get on and off the rear seat 9 between the position of the saddle 4 on which the driver rides and the rear seat 9, and convenience is improved. Furthermore, since the footrest 9f provided on the rear seat 9 is disposed below the rear wheel shaft 23, the footrest 9f can be disposed at a lower position and can be easily boarded.
[0046]
Further, with this configuration, the rear vehicle body 10 can be stably supported and the rear seat 9 is supported via the suspension mechanism 33, so that vibration from the rear wheel 2 can be absorbed by the suspension mechanism 33, Ride comfort is improved. In addition, since a free gear is used as the primary input gear 26 and the secondary gears 30A and 30B so that the left and right rear wheels 2 can be differentiated, the turning radius during traveling can be reduced and the vehicle can bend and travel. When doing so, one of the rear wheels 2 does not have to idle with respect to the ground, and durability is improved.
[0047]
In the above embodiment, the case where the rear wheel shaft 23 is arranged behind the input shaft 21 and the swing center shaft 24 has been described. However, the present invention is not limited to this, and the rear wheel shaft 23 is connected to the input shaft 21 or the swing shaft. You may arrange | position ahead of the dynamic center axis | shaft 24. FIG. In this case, although there is a disadvantage that a space for a person to get on and off between the saddle position where the driver gets on and the rear seat 9 becomes narrower, the rear wheel shaft 23 and the rear seat 9 can be easily arranged on the front side. It becomes easy to make the front and rear compact. Further, the swinging center shaft 24 shown in FIG. 3 and the like is omitted, and a swinging center shaft support bracket 25 is extended to the rear, and the rear wheel shaft 23 itself can be rotated by the swinging center shaft support bracket 25. You may comprise so that it may support.
[0048]
In the above embodiment, the case where the gears 27A, 27B, 30A, and 30B are used as the drive-side transmission wheel body and the driven-side transmission wheel body, and the transmission chain 31 is used as the endless body is described. A pulley or a belt can also be used instead of a thing. It is also possible to directly mesh the gears, but in this case, it is limited to the case where the distance between the gears is not so far.
[0049]
【The invention's effect】
As described above, according to the present invention, the input shaft to which the driving force transmitted to the pair of left and right rear wheels is input and the swinging center shaft that swingably supports the rear wheel shaft are disposed coaxially. As a result, the suspension mechanism can be mounted so that the rear wheel swings about the swing center axis, but a mechanism for absorbing the distance fluctuation of the relative position between the transmission wheel bodies is not required, and manufacturing is possible. Cost can be reduced.
[0050]
Also, the input shaft is divided into left and right parts, and the right-handed female thread part formed on the left primary output ring is screwed into the right-handed male thread part formed on the left end of the left-side divided input shaft, and the left part is split. Right-handed male thread formed near the right-end part of the right split input shaft by screwing the right-handed female threaded part formed on the primary input ring to the right-handed male threaded part formed on the outer periphery of the right-end part of the input shaft The right threaded female thread part formed on the right primary output wheel is screwed to the left part, and the left threaded female thread part formed on the inner periphery of the right end part of the left split input shaft is connected to the outer periphery of the left end part of the right split input shaft. By screwing the formed male thread part of the left-hand thread, standard parts whose female thread part of the boss part is a right-hand thread can be used as the primary input wheel body or the primary output wheel body, thereby reducing manufacturing costs. Can do.
[0051]
Further, the secondary input wheel body for inputting the driving force from the input shaft to the left and right rear wheel shafts is attached via the wheel body receivers attached so as to rotate integrally with the left and right rear wheel shafts, respectively. The right-handed female threaded part formed on the left secondary input ring body is screwed into the right-handed male threaded part formed on the right outer periphery of the left-hand ring body, and formed on the right secondary input wheel body. The secondary input ring body for inputting the driving force from the input shaft by screwing the female thread part of the right thread into the male thread part of the right thread formed on the left outer periphery of the right ring body receiver also has its boss part. A standard part having a right-hand thread can be used, and the manufacturing cost can be further reduced.
[0053]
In addition, by disposing the rear wheel shaft in front of the input shaft and the swing center shaft, the saddle position on which the driver rides can be brought closer to the rear seat, and the three-wheeled bicycle can be easily made compact in the front-rear direction. .
[0054]
In addition, by interposing a suspension mechanism between the rear seat on which a person is placed and the swing frame, vibrations from the rear wheel can be absorbed by the suspension mechanism, and riding comfort can be improved.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a three-wheeled bicycle according to an embodiment of the present invention.
FIG. 2 is an overall side view of the tricycle.
FIG. 3 is a plan view of a rear part of the three-wheel bicycle.
FIG. 4 is a partially cutaway plan view of the input shaft of the tricycle and the vicinity thereof.
FIG. 5 is a partially cutaway plan view of the rear wheel shaft on the left side of the three-wheeled bicycle and the vicinity thereof.
FIG. 6 is a partially cutaway plan view of the right rear axle and its vicinity in the same three-wheel bicycle.
7A and 7B are side views of the rear part of the three-wheel bicycle, wherein FIG. 7A shows a state where no external force is received, and FIG. 7B shows a state where an upward force is received from the ground.
FIG. 8 is a perspective view of a conventional rear wheel drive device for a three-wheel bicycle.
[Explanation of symbols]
1 front wheel
2 Rear wheels
4 saddles
5 Front frame
5c Front connecting plate
6 pedals
7 Auxiliary drive unit
8 Front body
9 Back seat
9f Footrest
9g Seat support frame
10 Rear body
11 Fixed front and rear frames
12 Rear connection plate
13 Input chain
15 Fixed horizontal frame
16 Fixed bottom frame
20 Rear frame
21 Input shaft
21a, 21c, 21h, 21f, 35a, 37a Male thread
21b, 21d, 21g, 35b, 37b
21A Left split input shaft
21B Right split input shaft
22 Input shaft support bracket
23 Rear axle
24 Oscillation center axis
25 Oscillation center shaft support bracket
26 Primary input gear
21e, 26a, 27a, 27b, 30a, 30b Female thread
27A, 27B Primary output gear
28 Rear wheel bearing
29 Swing frame
30A, 30B secondary gear
31 Transmission chain (endless body)
32 Suspension spring
33 Suspension mechanism
35, 37 Free gear receiver

Claims

An input shaft to which a driving force transmitted to the pair of left and right rear wheels is input;
A swing center shaft for swingably supporting the rear wheel shaft;
A pair of left and right drive-side transmission wheels attached to the input shaft;
The left and right driven side transmission wheel body is attached to the rear wheel shaft, and the driving force from the driving side transmission wheel body is transmitted through an endless body or directly,
The input shaft and the swing center shaft are arranged coaxially ,
A primary input wheel body that inputs driving force to the input shaft and two primary output wheel bodies that output driving force from the input shaft are attached to the input shaft,
The input shaft is divided into left and right,
The right-handed female threaded part formed on the left primary output ring is screwed into the right-handed male threaded part formed on the left end of the left split input shaft, and this left-side primary output wheeled body is attached. The right-hand thread internal thread portion formed on the primary input ring body is screwed to the external thread section of the right-hand thread formed on the outer periphery of the right end portion of the split input shaft, and the primary input ring body is attached.
Attach this right primary output ring body by screwing the right thread female thread part formed on the right primary output ring body into the right thread male thread part formed near the right end of the right split input shaft. ,
The left screw external thread formed on the left end outer periphery of the right split input shaft is screwed to the left screw internal thread formed on the inner periphery of the right end of the left split input shaft, and the left and right split input shafts are joined together. A tricycle characterized by that.

An input shaft to which a driving force transmitted to the pair of left and right rear wheels is input;
A swing center shaft for swingably supporting the rear wheel shaft;
A pair of left and right drive-side transmission wheels attached to the input shaft;
The left and right driven side transmission wheel body is attached to the rear wheel shaft, and the driving force from the driving side transmission wheel body is transmitted through an endless body or directly,
The input shaft and the swing center shaft are arranged coaxially ,
The secondary input wheel body for inputting the driving force from the input shaft to the left and right rear wheel shafts is configured to be mounted via the wheel body receivers that are mounted to rotate integrally with the left and right rear wheel shafts. ,
Screw the right-handed female threaded part formed on the left secondary input ring to the right-handed male threaded part formed on the right outer periphery of the left-hand ring body, and attach the left secondary input ring.
The right-hand side secondary input ring body is attached by screwing the right-hand thread part of the right-hand thread formed on the right-side secondary input wheel body into the right-hand thread part of the right-hand thread formed on the left outer periphery of the right-side wheel body receiver. A three-wheeled bicycle characterized by

An input shaft to which a driving force transmitted to the pair of left and right rear wheels is input;
A swing center shaft for swingably supporting the rear wheel shaft;
A pair of left and right drive-side transmission wheels attached to the input shaft;
The left and right driven side transmission wheel body is attached to the rear wheel shaft, and the driving force from the driving side transmission wheel body is transmitted through an endless body or directly,
The input shaft and the swing center shaft are arranged coaxially ,
A rear seat for carrying people is arranged between the rear wheels,
A three-wheeled bicycle, characterized in that a rear wheel shaft is disposed in front of an input shaft and a swing center shaft .

An input shaft to which a driving force transmitted to the pair of left and right rear wheels is input;
A swing center shaft for swingably supporting the rear wheel shaft;
A pair of left and right drive-side transmission wheels attached to the input shaft;
The left and right driven side transmission wheel body is attached to the rear wheel shaft, and the driving force from the driving side transmission wheel body is transmitted through an endless body or directly,
The input shaft and the swing center shaft are arranged coaxially ,
The bicycle frame is divided into a front frame and a rear frame,
The rear frame is connected to the front frame, and extends from the connecting portion to the front frame to the rear, and the fixed front and rear frames, and extends from the fixed front and rear frames to both sides. A fixed horizontal frame that supports the rear wheel body, a fixed bottom frame that forms the bottom of the rear vehicle body, and a swing frame that is supported swingably about the swing center axis and supports the rear wheel shaft rotatably. And
The rear seat for carrying a person is fixed with the legs attached to the fixed bottom frame,
A three-wheeled bicycle , wherein a suspension mechanism is interposed between the rear seat and the swing frame .