Hydrodynamic bearing unit

Details Hydrodynamic bearing unit Hydrodynamic bearing unit

2005-01-18

2005-01-18

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

C384S107000

Reexamination Certificate

active

06843602

ABSTRACT:
A hydrodynamic bearing unit is provided, by which the touch between oil and a sealing member in a housing is prevented to prevent oil leakage. A bearing member made of a sintered lubricant-containing metal is disposed along the inner periphery of the housing and a spindle is supported in a non-contact manner by the hydrodynamic oil pressure that is generated in a bearing gap by the rotation of the spindle. The opening of the housing is sealed by the sealing member. A ventilation path is formed so as to communicate a sealed space enclosed by the distal end of the spindle at the bottom of the housing, the bearing member and the housing with open air. An oil reservoir is formed between the inner periphery of the housing and the outer periphery of the bearing member at the end portion of the opening side of the housing. The oil reservoir is made so as to communicate with the ventilation path.

REFERENCES:
patent: 5441386 (1995-08-01), Hsieh
patent: RE35718 (1998-01-01), Nii et al.
patent: 6242830 (2001-06-01), Katagiri
patent: 6250807 (2001-06-01), Mori et al.
patent: 6357920 (2002-03-01), Mori et al.

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