Patent ID: 6749339
Filing Date: 2004-06-15
Classification: F16C,G02B,G11B,H02K

Abstract:
A hydrodynamic bearing assembly, comprising:a column shaft having an outer surface parallel to an axis; a hollow cylindrical sleeve having an inner surface rotatably arranged around the outer surface of said shaft; a radial bearing for generating a radial dynamic pressure due to a relative rotation between said sleeve and said shaft to keep them away from each other; a thrust plate secured on said shaft; a thrust opposing surface formed on said sleeve opposing to said thrust plate; and a thrust bearing for generating a thrust dynamic pressure due to the relative rotation between said thrust plate and said thrust opposing surface to keep them away from each other, wherein a total radial gap of a pair of side radial gaps along a diameter defined between the outer surface of said shaft and the inner surface of said sleeve is approximately 3 microns or less.