| 摘要 |
PROBLEM TO BE SOLVED: To provide a commutator wherein even if high pressure is applied to one side of the axial direction of a commutator segment from the outside of a radial direction, the other side of the axial direction of the commutator segment does not easily float. SOLUTION: The commutator includes an approximately cylindrical insulating material and a plurality of commutator segments arranged at the outer periphery of the insulating material in a circumferential direction and are retained by such a constitution that a convex 9 protruding in the direction of the wall thickness of the material is embedded in the insulating material. The convex 9 of the plate material T later formed into the plurality of commutator segments comprises a high projection 11 and a low projection 12 alternately repeating high and low portions in the axial direction of the insulating material. At the high projection 11, grooves 13a, 13b inclined in the axial direction of the insulating material are formed, and at the same time as these grooves being formed, projections 14a to 14c protruding in an orthogonal direction to the projecting direction of the high projection 11 are formed. At the low projection 12, low projections 15a, 15b simultaneously formed by press-forming the material itself are formed in a projected manner in the circumferential direction of the insulating material. COPYRIGHT: (C)2004,JPO
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