Patent ID: 8277142
Filing Date: 2012-10-02
Classification: B62D,F16D,Y10T

Abstract:
1. A shaft connection structure, comprising: a shaft including a tightened shaft portion at a tip end portion of the shaft and an annular bolt engagement groove on an axially intermediate portion of the tightened shaft portion; an insertion restriction portion provided at a tip end of the tightened shaft portion and rotatably connected thereto, said insertion restriction portion including an outer diameter smaller than that of the tightened shaft portion, and a central rotation axis of said insertion restriction portion is coaxial with a central axis of said shaft; a coupling member including a tightened portion formed with a shaft insertion hole into which the tightened shaft portion of the shaft is insertable, and a transverse bolt insertion aperture crossing a part of the shaft insertion hole at the tightened portion; and a bolt which is insertable into the bolt insertion aperture of the coupling member, and said bolt is tightened upon insertion into the bolt insertion aperture; wherein in a fully inserted condition, the tightened shaft portion is axially aligned with and fully inserted into the shaft insertion hole such that the bolt engagement groove and the bolt insertion aperture are axially aligned and the bolt is inserted therebetween, whereby a required torque is transmitted between said shaft and said coupling member and wherein in a partially inserted condition, the tightened shaft portion is axially aligned with and partially inserted into the shaft insertion hole such that a part of the insertion restriction portion is within a cross section of the bolt insertion aperture, whereby the insertion restriction portion restricts insertion of the bolt and the insertion restriction portion is rotatable relative to the shaft by a set torque smaller than the required torque, such that torques greater than said set torque are not transmitted from said shaft to said coupling member.