Patent ID: 6307295
Filing Date: 2001-10-23
Classification: F16C,H02K

Abstract:
A complex bearing assembly, comprising:a base member;a first cylindrical member having a cylindrical outer periphery defined therein;a second cylindrical member having a cylindrical inner periphery defined therein, said inner periphery having a greater diameter than that of said outer periphery of said first member, wherein said outer periphery of said first member is positioned in said inner periphery of said, second member, and wherein one of said first and second cylindrical members is fixed to said base member so that the other of said first and second cylindrical members rotates relative to said one of said first and second cylindrical members;a radial bearing formed by said opposed inner and outer peripheries for supporting said the other cylindrical member in a radial direction relative to said one fixed cylindrical member by means of a hydrodynamic force generated in a rotational movement of said the other rotatable cylindrical member relative to said one fixed cylindrical member between said opposing inner and outer peripheries; andan axial bearing having a first magnetic member secured on said the other rotatable cylindrical member and extended around a rotational axis of said bearing assembly and a second magnetic member secured on said one fixed cylindrical member and extended around said first magnetic member while leaving a space therebetween so that said first and second magnetic members cooperate to generate a magnetic force therebetween for supporting said the other rotatable member in an axial direction relative to said one fixed cylindrical member, wherein one of said first and second magnetic member is positioned in a coaxial fashion with said rotational axis of said bearing assembly and the other of said first and second magnetic member is positioned in an eccentric fashion with said rotational axis of said bearing assembly.