US 6,147,424 AGranted

Gas dynamic pressure bearing apparatus

AssigneeSankyo Seiki Mfg. Co., Ltd.

InventorsMasato Gomyo, Hideki Kanebako, Kazushi Miura, Masamichi Hayakawa

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Abstract

A gas dynamic pressure bearing apparatus comprises a fixed shaft, a bearing member which is positioned opposite from the fixed shaft and at least a radial gas dynamic pressure bearing portion and a thrust gas dynamic pressure bearing portion which are positioned in a space between the fixed shaft and the bearing member. Dynamic pressure generating means are included for pressurizing gas in the radial gas dynamic pressure bearing portion and the thrust gas dynamic pressure bearing portion such that dynamic pressure action is generated. The bearing member is rotatably supported in relation to the fixed shaft by means of the pressurizing action such that rotational driving is performed by a predetermined motor. The radial gas dynamic pressure bearing portion and the thrust gas dynamic pressure bearing portion are structured such that gas is sealed from the space around the motor by a space sealing means and that gas flows from one side to other. The flowing gas is circulated between the radial gas dynamic pressure bearing portion and the thrust gas dynamic pressure bearing portion through a gas circulation path. A gas passage is formed on the fixed shaft such that the gas circulation path is connected to the outer end of the fixed shaft. Dust collecting means is formed in one of the gas circulation and the gas passage.

Claims15

Dependent claims

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;
and
dust 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.

7 more elements

A gas dynamic pressure bearing apparatus comprising:

a fixed shaft;
a bearing member which is positioned across from said fixed shaft;
a stator assembly of a motor which is formed on said fixed shaft;
a rotor assembly of said motor which is formed on said bearing member;
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;
said radial gas dynamic pressure bearing portion and said thrust gas dynamic pressure bearing portion being formed such 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 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;
said gas circulation gas being connected to a motor space formed between said stator assembly and said rotor assembly;
and
dust collecting means being placed in front of said motor space in said gas circulation path.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/115,213Filed 14 Jul 1998
Priority: JP 9-21005318 Jul 1997
Granted: 14 Nov 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G11B 19/2009
Driving; Starting; Stopping; Control thereof: turntables, hubs and motors for disk drives; Mounting of motors in the drive
F16C 17/026
For radial load only: with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
F16C 17/24
Characterised by features not related to the direction of the load: with devices affected by abnormal or undesired positions, e.g. for preventing…
F16C 33/1015
Details of the bearing surface, e.g. means to generate pressure such as lobes or wedges: pressure generating grooves