Through the key which is engaged in the key engagement section which engagement structure of the key of the axial

摘要

A key-engaging part structure which realizes an efficient formation of a key-engaging part in an axial-hole member is provided. A key-engaging through hole is formed in a key-engaging part of an axial-hole member while both and portions of the axial-hole member leave intact such that the key-engaging through hole is bored through the axial-hole member in the radial direction. The key-engaging part is formed using this through hole.