公开(公告)号：US20240317356A1

公开(公告)日：2024-09-26

申请号：US18603510

申请日：2024-03-13

Applicant: Hsuan-Chih LIN ,  Kai-Wen LIN

Inventor： Hsuan-Chih LIN ,  Kai-Wen LIN

IPC: B62M3/00 ,  B62M11/02

CPC classification number: B62M3/00 ,  B62M11/02

Abstract: A crank apparatus equipped with a labor-saving mechanism and a bicycle crank assembly are disclosed. The crank apparatus includes a crank mechanism, a transmission mechanism, a supporting module and a rotating arm module. The crank mechanism includes a crank, an axle-end gear and a pedal-end gear. The transmission mechanism includes a rotating axle having a circular groove. The supporting module is adapted to sheathe the rotating axle and includes an outer ring and rollers received inside the circular grooves and clamped between the rotating axle and the outer ring. The rotating arm module includes a first rotating arm and a second rotating arm. One end of the second rotating arm is connected to the first rotating arm, and another end of the second rotating arm is connected to the pedal-end gear. Accordingly, the transmission stability and useful lifetime of the crank apparatus and bicycle crank assembly are increased.