Patent attributes
A multiplate clutch outer part is formed by pressing a steel plate. The multiplate clutch outer part includes: an end wall portion; and a cylindrical portion having its one end formed continuously with the outer peripheral end of the end wall portion, and opened at the other end. A bottom face of each of outer grooves is formed to be an inclined face which is getting far away from an axis of the cylindrical portion toward the open end of the cylindrical portion. Arc faces formed at inner corners of each of the outer grooves has an increasing radius of curvature toward the open end of the cylindrical portion. Thus, there is provided a multiplate clutch outer part for which press working capable of minimizing ironing resistance can be performed to reduce defective forming rate.
