Patent ID: 8590422

Claim:
A combination of bicycle crank and axle, comprising: a crank having a connection portion and a connection recess defined in an inside of the connection portion, the connection recess having an engaging recess, a reception recess and a reception groove, the engaging recess located at a closed end of the connection recess and the reception recess located at an opened end of the connection recess, a diameter of the reception recess being larger than that of the engaging recess, the reception groove located between the engaging recess and the reception recess, a diameter of the reception groove being larger than that of the reception recess; an axle having a cylindrical body and an engaging portion, the engaging portion located at an end of the cylindrical body and engaged with the engaging recess, a guide surface defined in an outer periphery of the cylindrical body and connected to the engaging portion, the guide surface located at the engaging recess when the engaging portion is engaged with the engaging recess, the cylindrical body having an annular groove defined in the outer periphery thereof, the annular groove located at an end of the guide surface and being remote from the engaging portion, and a ring-shaped washer mounted to the cylindrical body and having a first end and a second end, the first end of the ring-shaped washer being guided by the guide surface and the reception groove being completely filled by the first end of the ring-shaped washer, the second end of the ring-shaped washer engaged between the cylindrical body and the reception recess, the second end of the ring-shaped washer being engaged with the annular groove.