Patent ID: 6236535
Filing Date: 2001-05-22
Classification: F16C,G11B,H02K

Abstract:
A spindle motor comprising:a shaft defining an axial bore extending completely through a length of the shaft, at least a portion of the axial bore defining a fluid reservoir, the shaft also defining a radial passageway extending radially from the fluid reservoir to an exterior surface of the shaft;a pin that seals the axial bore, the pin being secured within the bore by one of an adhesive connection and a shrink-fit connection, the pin includes a head portion and an elongate portion extending longitudinally from the head portion along the axial bore, the elongate portion having a reduced diameter as compared to the head portion, wherein the fluid reservoir is formed along the elongate portion of the pin;a plug that seals the axial bore, the pin and plug being positioned within the axial bore such that the fluid reservoir is located between the pin and the plug, the plug being secured within the bore by one of an adhesive connection and a shrink-fit connection;a rotor member to which a storage disc can be secured, the rotor member being rotatably mounted on the shaft; anda bearing fluid adapted to form a hydrodynamic bearing between the exterior surface of the shaft and the rotor member, the bearing fluid at least partially filling the fluid reservoir and the radial passageway.