Patent ID: 6672767
Filing Date: 2004-01-06
Classification: F16C,G11B

Abstract:
A dynamic bearing device comprising: a housing having an end with an opening and another end with a bottom part;a shaft member having an axial part and a flange part to be housed in the housing; a cylindrical bearing member to be housed in the housing, constituted by a porous body made of a sintered metal; at least one radial bearing part provided between an inner peripheral surface of the bearing member and an outer peripheral surface of the axial part, which support the axial part in the radial direction in a non-contact manner by means of a dynamic pressure action of a lubricating oil to be caused in a radial bearing gap; thrust bearing parts provided between both surfaces of the flange part and an end surface of the bearing member and the bottom part of the housing, which support the flange part in the thrust directions in a non-contact manner by means of a dynamic pressure action of a lubricating oil to be caused in thrust bearing gaps; and a sealing member arranged in the opening of the housing, wherein an inner space of the housing including pores of the bearing member is filled with a lubricating oil, and wherein the bearing member comprises an area at the outer diameter side of an end surface area of the bearing member which constitutes the thrust bearing gap, the area having a percentage of surface openings of the pores larger than that of the end surface area.