Patent ID: 7507159

Claim:
A power transmission apparatus comprising: a rotary portion to which turning driving force from a driving source is transmitted and which can rotate; a power cutoff member mechanically connected to said rotary portion and an end of a rotary shaft of a driven apparatus, and cutting off transmission of an excessive torque between said rotary portion and said rotary shaft; and a cap connected to said one end of said rotary shaft and fastened by screw meshing to said power cutoff member to transmit power from said power cutoff member to said rotary shaft; wherein said rotary portion, said power cutoff member, said cap and said rotary shaft rotate integrally with one another; said cap has a flange protruding in a radial direction with respect to an axis of said rotary shaft; and the torque transmitted from said rotary portion to said rotary shaft is converted to an axial force in the axial direction of said rotary shaft as said cap and said power cutoff member are fastened with each other through screw meshing, and said flange portion supports said axial force.