COUPLING STRUCTURE, COUPLING MEMBER HAVING COUPLING STRUCTURE, AND METHOD FOR PRODUCING COUPLING MEMBER HAVING COUPLING STRUCTURE

摘要

This coupling member comprises a hollow rod section configured from a metal tube, and a fastening section formed so as to join to the end of the hollow rod section by plastic deformation of the metal tube. The fastening section comprises a pair of proximal end sections that join to a peripheral wall section forming a closed cross section in the end of the hollow rod section and that are separated from each other, a bottom wall having a flat surface joined with the pair of proximal end sections, and a pair of distal end sections having a pair of side walls that bend inward from the widthwise ends of the bottom wall in at least the proximal end sides.