To provide a bicycle crank assembly which is excellent in torque transmission property from a crank to a sprocket, and which has high durability with a simple structure.SOLUTION: A bicycle crank assembly comprises: a crank shaft with an internal space, provided with an opening part at one end part; a crank arm mounted to the end part of the crank shaft; a torque transmission mechanism which includes a slide shaft built in the internal space of the crank shaft and provided with a plurality of rows of groove parts extending in the axial direction of the crank shaft on an outer peripheral surface, and which includes a plurality of rolling bodies accommodated in the respective plurality of rows of groove parts of the slide shaft; and a sprocket mounted around the slide shaft in the torque transmission mechanism. In the bicycle crank assembly, the number of the rows is five or less in the rows of groove parts extending on the outer peripheral surface of the slide shaft in the torque transmission mechanism.SELECTED DRAWING: Figure 2

    【課題】クランクからスプロケットへのトルク伝達性に優れ、簡素な構造で高い耐久性を示す自転車用クランク組立体を提供する。【解決手段】一方の端部に開口部を備えた内部空間を有するクランク軸;クランク軸の上記端部に取り付けられたクランクアーム;クランク軸の内部空間に内蔵された、クランク軸の軸方向に延びる複数列の溝部を外周面に備えた摺動軸、及び摺動軸の複数列の溝部のそれぞれに収容された複数個の転動体を含むトルク伝達機構;そしてトルク伝達機構の摺動軸の周囲に取り付けられたスプロケットを含む自転車用クランク組立体であって、トルク伝達機構の摺動軸の外周面に延びる溝部が五条列以下である自転車用クランク組立体。【選択図】図2


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    Title :

    BICYCLE CRANK ASSEMBLY WITH BUILT-IN TORQUE TRANSMISSION MECHANISM


    Additional title:

    トルク伝達機構を内蔵する自転車用クランク組立体


    Contributors:

    Publication date :

    2019-09-19


    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 / F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen



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