Patent ID: 6505970
Filing Date: 2003-01-14
Classification: F16C

Abstract:
A thrust dynamic pressure bearing, comprising:a rotor having a rotor end face, said rotor being formed without through holes passing through said rotor; a housing accommodating said rotor in a hermetically sealed state with a housing face opposing said rotor end face and defining a bearing gap therebetween; thrust dynamic pressure generating grooves being formed in a v-shape in one of said rotor end face and said housing face, and said bearing gap and said dynamic pressure generating grooves being filled with a working fluid for generating a dynamic pressure; and first and second pockets, which serve as spaces for accumulating the working fluid, being formed in said rotor end face and said housing face of said housing that is opposed to said rotor end face, respectively, and a total of capacities of said first and second pockets being 50 times or more a capacity of said bearing gap between said rotor end face and said housing face.