FASTENING STRUCTURE AND PIN MEMBER

PROBLEM TO BE SOLVED: To provide a fastening structure and a pin member capable of easily fastening members to each other enabling rotation of the members to be prevented to each other and high strength*anti-vibration characteristic to be held when the members are fastened to each other without performing any two-points fixing.SOLUTION: After inserting and passing a pin member through insertion and passing holes formed at a first member to be fastened and a second member to be fastened, a collar member is outwardly inserted to the pin member to fasten the first member to be fastened and the second member to be fastened. The shank part of the pin member has a circular shape in which a sectional shape crossing at a right angle with a longitudinal direction of the shank part is a polygonal shape or a circle of which diameter varies along a peripheral direction and at the same time the insertion and passing holes have shapes corresponding to the sectional shape crossing at a right angle in respect to the longitudinal direction of the shank part. A head part of the pin member has an approximate similar figure of crossing shape crossing at a right angle with a longitudinal direction of the shank part of the pin member.SELECTED DRAWING: Figure 2 【課題】２点留めを行うことなく部材どうしを締結するにあたり、部材どうしの回転を防止するとともに高い強度・耐振動性を保持可能ならしめる部材どうしの締結を、容易に行うことができる締結構造およびピン部材を提供する。【解決手段】 第１の被締結部材及び第２の被締結部材に形成された挿通孔にピン部材を挿通させたのち、当該ピン部材にカラー部材を外挿して第１の被締結部材と第２の被締結部材とを締結させる。ピン部材の軸部は、軸部の長手方向に対して直交する断面形状が多角形または周方向に沿って径が変化する円形であるとともに、挿通孔が軸部の長手方向に対して直交する断面形状と対応する形状である。ピン部材の頭部は、ピン部材の軸部の長手方向に対して直交する断面形状の略相似形である。【選択図】図２