Hydrodynamic bearing device

Details Hydrodynamic bearing device Hydrodynamic bearing device

2005-04-12

2005-04-12

Footland, Lenard A. (Department: 3682)

Bearings

Rotary bearing

Fluid bearing

Reexamination Certificate

active

06877902

ABSTRACT:
A hydrodynamic bearing device in which an incline between the center line of a shaft and the center line of a sleeve can be eliminated, rotational precision improved, and NRRO reduced, characterized in that different bearing lengths (L1and L2) are selected for radial bearing portions and that at least any one parameter selected from among groove depths of pressure generating grooves, groove angles formed between the grooves and the radial direction of an shaft, and groove width ratios [a/(a+b)] of groove width (a) in relation to the sum (a+b) of the groove width (a) and ridge width (b) is caused to vary among the plurality of radial bearing portions.

REFERENCES:
patent: 5370463 (1994-12-01), Asada et al.
patent: 58-109715 (1983-06-01), None
patent: 58-179588 (1983-10-01), None
patent: 62-37511 (1987-02-01), None
patent: 63-92819 (1988-06-01), None
patent: 6-335366 (1996-12-01), None

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