An effort-saving crank structure 1 of a bicycle includes: a crank mechanism 10 having a crank 11, a shaft end gear 12 and a pedal end gear 13 disposed on the crank 11; a transmission mechanism 20 disposed in the crank 11 and having a rotation shaft 21 and a first gear 22 and a second gear 23 connected to the rotation shaft 21. The first gear 22 and the shaft end gear 12 are engaged for transmission, and the second gear 23 and the pedal end gear 13 are engaged for transmission. A rotation arm unit 30 is connected to the pedal end gear 13. The rotation arm may maintain a constant orientation with respect to the bicycle as the crank structure rotates in use, such that pedal rotate about a virtual axis eccentric to the bottom bracket axis.


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    Title :

    Effort-saving crank structure and assembly of bicycle


    Contributors:

    Publication date :

    2022-09-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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



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