Patent ID: 9110438
Filing Date: 2015-08-18
Classification: G03G

Abstract:
1. A flange member comprising: a press-fitted portion configured to be press-fitted in an end-opening portion at an end of a hollow and cylindrical sleeve member in an axial direction of the sleeve member; an axle opening portion including an axle opening into which a shaft member is inserted at a position corresponding to a central axis of the sleeve member when the press-fitted portion is press-fitted in the end-opening portion; and a linking portion extending in a direction parallel to a circular cross section of the sleeve member upon press fitting of the flange member, the linking portion connecting the axle opening portion to the press-fitted portion, wherein the linking portion includes plural stress-absorbing portions, each stress-absorbing portion configured to be deformed so as to absorb a stress to which an outer peripheral surface of the press-fitted portion is subjected upon contact with an inner peripheral surface of the sleeve member when the press-fitted portion is press-fitted in the end-opening portion, thus preventing the stress from being transmitted to the axle opening portion via the linking portion, wherein for every possible imaginary line drawn from a circumference of an imaginary projected circle to the axle opening portion, at least one of the plural stress-absorbing portions is disposed on said imaginary line drawn from a circumference of the imaginary projected circle to the axle opening portion, the imaginary projected circle being a projection of the outer peripheral surface of the press-fitted portion on an imaginary plane perpendicular to the axial direction and including the linking portion, and wherein each stress-absorbing portion includes an opening through the linking portion in the axial direction.