Patent ID: 7892123

Claim:
A rotational force transmission member mounting structure, comprising: a rotational force transmission member ( 22 ) fitted onto an end face ( 9 e ) of a rotating shaft ( 9 ) in a splined manner; a coned disc spring ( 23 ) stacked onto the rotational force transmission member ( 22 ); a washer ( 24 ) stacked onto and making direct contact with both the coned disc spring ( 23 ) and the end face ( 9 e ) of the rotary shaft ( 9 ); and a screw fastening member ( 25 / 31 ) adapted to be mounted on the rotating shaft ( 9 ) and making direct contact with an outer face ( 24 o ) of the washer ( 24 ), and pressing an inner side of the washer ( 24 ) against the coned disc spring ( 23 ) and the end face ( 9 e ) of the rotary shaft ( 9 ); wherein an inner side ( 23 i ) of the coned disc spring ( 23 ) making direct contact only with an outer face ( 22 o ) of the rotational force transmission member ( 22 ), and an outer circumferential edge ( 23 b ) at the inner side ( 23 i ) of the coned disc spring ( 23 ) is the only portion of the coned disc spring ( 23 ) making contact with the rotational force transmission member ( 22 ), wherein an outer circumferential portion ( 24 c ) at the inner side ( 24 f ) of the washer ( 24 ) is notched off in a ring shape, and the coned disc spring ( 23 ) is disposed in the portion that is notched off in the ring-shape, and wherein said rotational force transmission member ( 22 ) is a drive sprocket splined to said rotating shaft ( 9 ).