Patent ID: 7726884

Claim:
A support structure for a rotation body comprising: a rotation body; a housing in which the rotation body is housed; a bearing by which the rotation body is supported in the housing so as to be rotatable around an axis of the housing, and which includes an outer race, an inner race, and plural rolling elements provided between the outer race and the inner race; a wave spring which is provided between the outer race and the housing, and which has a predetermined elastic force; and a stopper mechanism which stops movement of the outer race in an axial direction by contacting the outer race before the wave spring is completely contracted due to movement of the outer race in the axial direction, wherein the wave spring is a first wave spring and the bearing is a first bearing that supports a first end of the rotation body in the axial direction, the first wave spring is provided between the first bearing and the housing, and a second wave spring is provided between a second bearing that supports a second end of the rotation body in the axial direction and the housing, the stopper mechanism is a first stopper mechanism provided for the first wave spring, a second stopper mechanism is provided for the second wave spring, and the second stopper mechanism stops movement of an outer race of the second bearing by contacting the outer race of the second bearing before the second wave spring is completely contracted due to movement of the outer race of the second bearing in the axial direction of the rotation body, the first and second wave springs are different from each other in at least one of a spring constant and a free length, and the first and second wave springs and the first and second stopper mechanisms are positioned such that the first stopper mechanism stops movement of the outer race of the first bearing by contacting the outer race of the first bearing while a driving force is not being transmitted to the rotation body.