Patent ID: 6147424
Filing Date: 2000-11-14
Classification: F16C,G11B,H02K

Abstract:
A gas dynamic pressure bearing apparatus comprising:a fixed shaft;a bearing member which is positioned opposite from said fixed shaft;at least a radial gas dynamic pressure bearing portion and a thrust gas dynamic pressure bearing portion which are positioned in a space between said fixed shaft and said bearing member;dynamic pressure generating means for pressurizing gas being included in said radial gas dynamic pressure bearing portion and said thrust gas dynamic pressure bearing portion such that dynamic pressure action is generated;said bearing member being rotatably supported in relation to said fixed shaft by means of said pressurizing action such that rotational driving is performed by a predetermined motor;said radial gas dynamic pressure bearing portion and said thrust gas dynamic pressure bearing portion being structured such that gas is sealed from a space around said motor by a space sealing means and that gas flows from one of said radial gas dynamic pressure bearing and said thrust gas dynamic pressure bearing to the other of said radial gas dynamic pressure bearing and said thrust gas dynamic pressure bearing;said flowing gas being circulated between said radial gas dynamic pressure bearing portion and said thrust gas dynamic pressure bearing portion through a gas circulation path;a gas passage being formed on said fixed shaft such that said gas circulation path is connected to the outer end of said fixed shaft; anddust collecting means being formed in one of said gas circulation path and said gas passage, said dust collecting means being mounted along a path and through which said gas flows and adapted to collect dust from all of said gas flowing through said one of said gas circulation path said gas passage.