Patent ID: 8253286
Filing Date: 2012-08-28
Classification: F04D,H02K

Abstract:
1. A motor comprising: a base portion; a substantially cylindrical bearing housing extending from the base portion along an axis; an insulator attached to an axially upper end portion of the bearing housing; a coming-off preventing portion including a through hole and arranged axially above the insulator; a shaft arranged to pass through the through hole to be inserted inside the bearing housing; and a boss portion including a columnar portion and a collar portion, the columnar portion being arranged to retain one end of the shaft and inserted inside the through hole, the collar portion extending radially outward from a lower end of the columnar portion; wherein the coming-off preventing portion includes an inner circumferential edge defining the through hole, the inner circumferential edge including at least two different radial dimensions; the collar portion includes an outside surface including at least two different radial dimensions, and an upper surface arranged axially opposite a bottom portion of the inner circumferential edge; and the at least two different radial dimensions of the inner circumferential edge and the at least two different radial dimensions of the collar portion are defined by radial projections and radial recesses alternatingly arranged about circumferences of each of the collar portion and the inner circumferential edge, the at least two different radial dimensions of the inner circumferential edge and the at least two different radial dimensions of the collar portion are arranged to allow the collar portion to be axially inserted through the inner circumferential edge with application of a slight force when the inner circumferential edge and the collar portion are arranged in a predetermined circumferential orientation relative to each other.