To provide a chain drive mechanism for a bicycle, which can transfer a driving force to a rear wheel even when the rotational direction of a crank arm is either of normal and reverse ones, capable of achieving a simple entire configuration and low manufacturing cost.SOLUTION: An outer sprocket 24 is arranged side by side to be relatively rotatable to a crank shaft 12 coaxially to an inner sprocket 20 rotating together with a crank shaft 12 for a bicycle. An outer freewheel 26 is arranged side by side to be coaxial to an inner freewheel 22 rotating coaxially to a rear wheel of the bicycle. For the outer sprocket 24 to rotate in a reverse direction to the inner sprocket 20 and for the outer freewheel 26 to rotate in a reverse direction to the inner wheel 22, a chain 28 is provided onto each of the inner sprocket 20 and the outer sprocket 24, and each of the inner freewheel 22 and the outer freewheel 26 so that they are engaged with each other.SELECTED DRAWING: Figure 1

    【課題】クランクアームの回転方向が正逆いずれの場合でも、後輪に駆動力を伝達することが可能な自転車のチェーン駆動機構をシンプルな全体構成かつ安価な製作コストで提供する。【解決手段】自転車のクランク軸12と一体回転する内スプロケット20と同軸上に外スプロケット24をクランク軸12に対して相対回転可能に並設する。また、自転車の後輪と同軸回転する内フリーホイール22と同軸上に外フリーホイール26を並設する。外スプロケット24が内スプロケット20とは逆方向に回転し、外フリーホイール26が内フリーホイール22とは逆方向に回転するように、内スプロケット20及び外スプロケット24、並びに、内フリーホイール22及び外フリーホイール26の各々にチェーン28が掛けられた構成とする。【選択図】図1


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    Title :

    CHAIN DRIVE MECHANISM FOR BICYCLE


    Additional title:

    自転車のチェーン駆動機構


    Contributors:

    Publication date :

    2020-09-03


    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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