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US 4,899,569 AGranted
Method for manufacturing a rotor frame of an electromagnetic clutch
AssigneeSanden Corporation
InventorsTakashi Matsushita, Kozaburo Tsuchiya
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Abstract
A method for manufacturing a rotor frame of an electromagnetic clutch is disclosed. A rotor frame is manufactured using press machines in a sequential process of: (1) forming a blank which has the shape of a regular polygon; (2) forming a bulge in one side of the blank; (3) making a hole in the center of the bulge; and (4) bending the walls of the bulge and the blank edges into projections that can be machined to provide appropriately shaped end surfaces for use as a rotor frame.
Claims9
A method for manufacturing a rotor frame for an electromagnetic clutch, said method comprising:
- forming a blank exhibiting a regular polygon shape from an iron plate, said blank having a top surface, edges, and a central area;
- forming a convexly curved bulge in said central area of said blank, said bulge having a dome shape with a first radius of curvature;
- forming a first annular projection at said edges in said bulged blank, said first annular projection being oriented in a projection axis substantially perpendicular to the top surface of said blank;
- removing at least a center portion of said bulge to form a hole in said blank surrounded by curving annular walls;
- expanding said hole and bending said curving walls of dome shape to form a second annular projection oriented in a direction substantially parallel to said first annular projection;
- extending said first annular projection along said projection axis;
- and
- machining end surfaces into the first and second annular projections.
5 more elements
Dependencies are inferred from the claim text.