Process for manufacturing a commutator
AssigneeMitsuba Electric Manufacturing Co., Ltd.
InventorsTakashi Shibata, Nobuo Yamada, Yoshikazu Mada, Masaki Iizima
Life of this patent
Estimating the term…
Abstract
A commutator for use with a DC motor or a DC generator. The parent metal of the segments of the commutator is formed with bulging portions which have their outer surfaces generally coextending with the outer surfaces of protecting portions for contacting with brushes. This commutator is manufactured by forming a cylinder of a plate of a conductive material, by forming a plurality of pawls on the circumference of the cylinder, by molding a boss of a synthetic resin in the cylinder, by forming a plurality of notches in one end of the cylinder, and by cutting the trunk of the cylinder into a plurality of slits to form a plurality of separate segments.
Claims6
A process for manufacturing a commutator, comprising the steps of:
- (a) providing a cylinder of a conducting parent material covered with protecting material on at least its surface for contacting with brushes and having a bulging portion at an end portion of said parent material such that the outer surface of said bulging portion is generally coextensive with the outer surface of said protecting material;
- (b) placing said cylinder in a mold having a cavity with said bulging portion and said outer surface of said protecting material supported by an interior wall of the mold cavity;
- (c) molding a boss of an insulating material in the hollow portion of said cylinder leaving a space at its end portion at the side where the bulging portion is;
- (d) cutting said cylinder and said boss at their end portion at the side where the bulging portion is to arrange a plurality of notches circumferentially equidistantly, thereby to simultaneously form riser members on said cylinder and recesses in said boss;
- and
- (e) cutting and dividing a trunk of said cylinder to arrange each of a plurality of slits between adjacent two of said riser members thereby to form each of commutator segments.
Dependencies are inferred from the claim text.