Patent ID: 7258041
Filing Date: 2007-08-21
Classification: B62M,Y10T

Abstract:
1. A bicycle crank assembly comprising: a crank shaft including first and second portions with the second portion being positioned on a right side of the first portion and having a larger diameter than the first portion; and a right crank including a sprocket mounting part including a plurality of arm parts configured and arranged to support at least one sprocket, a crank arm part formed integrally with the sprocket mounting part and extending in a radial direction from a first surface of the sprocket mounting part, and a crank shaft engagement bore formed in a center of a second surface located on an opposite side of the sprocket mounting part as the first surface, the right crank being crimp-fastened to the crank shaft by installing the second portion of the crank shaft into the engagement bore such that a gap is formed between the first portion and the engagement bore, and pressing the periphery of the engagement bore from the second surface toward the first surface in the axial direction of the crank shaft such that a pressed portion bulges radially inward and an annular space is formed between the crank shaft and the engagement bore.