Patent ID: 6787954
Filing Date: 2004-09-07
Classification: F16C,H02K

Abstract:
A spindle motor comprising: a shaft;a flange fixed to a first axial end of said shaft and having a diameter greater than that of said shaft; a cylindrical sleeve to which said shaft is fit, said sleeve having a tapering section at an upper end portion of said sleeve, said tapering section being inclined generally upwardly and outwardly in a direction from an inner surface of said sleeve toward an outer surface of said sleeve, and said tapering section having a dimension in a radial direction of said sleeve that is greater than a dimension of said tapering section in an axial direction of said shaft; a radial bearing space defined between said inner surface of said sleeve and an outer surface of said shaft; a rotor hub fixed to a second axial end of said shaft and disposed opposite to said upper end portion of said sleeve; a thrust plate disposed opposite said flange; and a thrust bearing space defined between an upper surface of said thrust plate and a lower surface of said flange, wherein lubricant is to be retained in said thrust bearing space.