公开(公告)号：US20190351970A1

公开(公告)日：2019-11-21

申请号：US16408499

申请日：2019-05-10

Applicant: De Jin YE

Inventor： De Jin YE

IPC: B62M1/36 ,  B62M3/00 ,  F16H21/14

Abstract: In order to solve low strength and labor-saving of transmission mechanism of conventional crank assembly for a bicycle, this invention provides a crank device. The crank device of this invention includes: a housing (3) to be connected to a frame of the bicycle; a transmission member (4) accommodated in the housing (3) in a loose-fit manner; a supporting shaft (5) partially accommodated in the transmission member (4) in a loose-fit manner; and two driving assemblies (8, 9). Each of the driving assemblies (8, 9) includes: a driving member (82, 92) secured to transmission member (4) and to be connected to a sprocket of the bicycle, wherein one end of the supporting shaft (5) passes through the transmission member (4) and the driving member (82, 92) in a loose-fit manner; and a force arm (81, 91) including an ear (811) secured to the driving member (82, 92) and a bump (812) pivoted to the one end of the supporting shaft (5). This invention allows the crank device to transmit a large force and enhance labor-saving effect.