Hydrodynamic fluid pressure bearings

Details Hydrodynamic fluid pressure bearings Hydrodynamic fluid pressure bearings

1996-12-20

1998-01-13

Hannon, Thomas R.

Bearings

Rotary bearing

Fluid bearing

384113, 384120, F16C 3206

Patent

active

057071543

ABSTRACT:
A hydrodynamic bearing device includes a gap between a shaft and shaft holder. One of the shaft and shaft holder has a recess for separating by capillary action lubricant at an upper portion of the gap above the recess from lubricant at a lower portion of the gap below the recess. The separated lubricant at the recess forms a gas interposition in order to reduce lubricant resistance. A hole formed in the shaft or shaft holder communicates the air interposition to the external atmosphere to prevent air expansion and the build-up of bubbles in the lubricant which could otherwise cause contamination and leakage. An axially extending storage groove supplies by capillary action lubricant from either the upper or lower portion to the other portion if lubricant in the other portion decreases due to vaporization or leakage, whereby the loss of lubricant is minimized and the operating life of the surrounding components are increased.

REFERENCES:
patent: 4254961 (1981-03-01), Fersht et al.
patent: 4445793 (1984-05-01), Shinohara
patent: 4798480 (1989-01-01), Van Beek
patent: 4892418 (1990-01-01), Asada et al.
patent: 5112142 (1992-05-01), Titcomb et al.

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