Patent ID: 6274958
Filing Date: 2001-08-14
Classification: F16C,H02K

Abstract:
A spindle motor comprising:a stator portion having an oil-impregnated plain bearing;a rotor portion which has a rotating shaft and is rotatably supported by the oil-impregnated plain bearing, wherein lubricating oil from the oil-impregnated plain bearing seeps out to form a lubricating membrane in a gap between the oil-impregnated plain bearing and the rotating shaft; anda substantially flat plate affixed to an entire surface of at least one end face of the oil-impregnated plain bearing and adapted to prevent leakage of the lubricating oil outside of the gap due to rotation of the rotor portion, the substantially flat plate formed of a non-absorbent material wherein the substantially flat plate completely repels the lubricating oil such that the lubricating oil is maintained entirely within the oil-impregnated plain bearing and the gap.