Patent ID: 7772739
Filing Date: 2010-08-10
Classification: H01R,H02K

Abstract:
1. A commutator with which a feeding brush is brought into slidable contact the commutator comprising; a tabular holding portion defining a thickness direction, the holding portion having one end in the thickness direction; a plurality of segments arranged in the one end in a radial pattern, each of the segments having a slidable contact surface which is perpendicular to the thickness direction, wherein the feeding brush is brought into slidable contact with the slidable contact surface; and a tabular short-circuit unit short-circuiting the segments to be set to the same electric potential, the short-circuit unit being arranged parallel to the slidable contact surface, the short-circuit unit including a tabular short-circuit group, the short-circuit group including a plurality of outer short-circuit ends, the same number of inner short-circuit ends as the outer short-circuit ends, and the same number of coupling portions as the outer short-circuit ends, the outer short-circuit ends being arranged in a circumferential direction, the inner short-circuit ends being arranged in the circumferential direction in an inner side in a radial direction than the outer short-circuit ends, wherein all of the coupling portions respectively couple the outer short-circuit ends corresponding thereto to the inner short-circuit ends which are displaced by a predetermined angle with respect to the outer short-circuit ends, as viewed in the thickness direction, wherein each of the segments has an outer connection portion provided in an outer end in the radial direction, and an inner connection portion provided in an inner end in the radial direction, and wherein the outer short-circuit ends are connected to the outer connection portions, and the inner short-circuit ends are connected to the inner connection portions.