Importance

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Abstract

A drive plate having a plate portion and a ring portion is shaped integrally by pressing using dies. The ring gear portion has inner recessed portions positioned on the inner side of a plurality of outer teeth. The inner peripheral surface of each of the inner recessed portions includes an inner bottom surface having a pair of curved corner surfaces, a pair of first side surfaces inclined so as to become closer to each other as the first side surfaces extend from the opening end of the inner recessed portion toward the inner bottom surface, and a pair of second side surfaces formed in a band shape between the corner surfaces and the first side surfaces. The degree of inclination of the second side surfaces with respect to a center line is smaller than the degree of inclination of the first side surfaces with respect to the center line.

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First Claim