PROBLEM TO BE SOLVED: To solve a problem in that a conventional bicycle is heavy in pedal rotation during high speed running, which is because the gear ratio of the top gear of a rear wheel to the chain wheel of a crank is large, and the drive force of the rear wheel is small, with the result that the chain wheel requires larger tensile force.SOLUTION: When a pedal is stepped on in the direction of forward rotation behind a chain wheel 19 and, at the same time, an upper chain 4 from a top gear is moved in a forward direction, the first gear 54 in the upper two lines engaging with a lower face rotates backward. Additionally, the second gear 55 in a lower two lines is rotated backward via a looped connection chain 56, and a lower chain 4 engaging with an upper face is pulled. Thereby, the tensile force of the forward rotation of the chain wheel 19 is increased to enable light pedal rotation.

    【課題】従来の自転車は、高速走行時でのペダルの回転が重たいという問題があった。これは後輪のトップギヤと、クランクのチェーンホイールとのギヤ比が大きいことのより、後輪の駆動力が小さいため、チェーンホイールに大きな引張り力が必要になるためである。【解決手段】チェーンホイール19の後方であって、ペダルを前回転方向に踏み込むと同時に、トップギヤからの上方のチェーン4が前方向に移動すると、下面に噛み合いの上部の2列の第1ギヤ54は後回転し、さらに、ループ状の連結チェーン56を介して、下部の2列の第2ギヤ55を後回転させて、上面に噛み合いの下方のチェーン4を引っ張ることにより、チェーンホイール19の前回転の引張り力は増加することで、軽いペダル回転をすることができる。【選択図】図4


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    Title :

    GEAR DEVICE FOR BICYCLE, AND BICYCLE


    Additional title:

    自転車のギヤ装置および自転車


    Contributors:

    Publication date :

    2016-01-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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