Patent ID: 6843602

Claim:
A hydrodynamic bearing unit comprising: a bearing member made of a sintered lubricant-containing metal, having a bearing gap between said bearing member and a spindle to be supported by said bearing member and supporting said spindle in a non-contact manner by a hydrodynamic oil pressure generated in said bearing gap by relative rotation of said bearing member with respect to said spindle; a housing for accommodating said bearing member, having an opening at its one end and being enclosed at its other end, wherein the enclosed end of the housing contacts an end surface of the bearing member; a sealing member for sealing said opening of said housing, wherein said sealing member is fixed to said opening of said housing; and a ventilation path to communicate a sealed space enclosed by said spindle, said bearing member and said housing to the outside, wherein said ventilation path comprises a first path between said inner periphery of said housing and said outer periphery of said bearing member, and a second path formed between the end surface of the bearing member and the enclosed end of said housing contacting the end surface of the bearing member, wherein an oil reservoir communicating with said ventilation path is formed at an end portion of an opening side of said housing between an inner periphery of said housing and an outer periphery of said bearing member.