Patent ID: 8250735

Claim:
A method of manufacturing a motor adopting an improved mechanism for driving a disc, the motor comprising: a hub for loading a disc; and a sleeve for fixing the hub, the method comprising the steps of: (a) forming on the outer circumferential surface of the sleeve a first outer circumferential surface having a first diameter, a second outer circumferential surface having a second diameter that is larger than the first diameter, and a receiving surface that links the first outer circumferential surface and the second outer circumferential surface, the receiving surface lying along a plane that intersects at right angles with an axis of revolution of the sleeve, (b) manufacturing the hub, the step of manufacturing the hub further comprising the steps of: (1) forming a hole in a metal plate; (2) applying a burring process to the hole along a center axis of the hole in a direction opposite to a surface of the metal plate to be loaded with a disc to form a protruded section having a cylindrical shape; and (3) forming a hitting surface at the protruded section by punching a tip end portion of the protruded section with an annular punch of a male die while the protruded section is securely fastened between a female die and a male die from both the outer and inner surfaces of the protruded section; and (c) fixing the hub on the sleeve by inserting the first outer circumferential surface of the sleeve into the protruded section of the hub until the receiving surface of the sleeve contacts the hitting surface of the hub.