Bearings – Rotary bearing – Fluid bearing
Patent
1998-11-10
2000-04-25
Hannon, Thomas R.
Bearings
Rotary bearing
Fluid bearing
384100, F16C 3206
Patent
active
060536365
ABSTRACT:
A hydrostatic bearing is uniquely configured for improved operability. A hydrostatic bearing (32) has a collar (42) that circumscribes a shaft (18) to define a fluid film annulus (50) for radially confining a load supportive fluid film. An array of pockets (52) distributed circumferentially along a bearing surface (48) communicate with vent regions (64a, 64b) in which the vent pressures are substantially unequal. Supply passages (76) associated with the pockets (52) are oriented at an angle .theta. for injecting fluid into the annulus with an axial directional component directed toward the higher pressure vent region. The orientation angle .theta. compensates for the propensity of the fluid to preferentially feed the low pressure side of the bearing. Further, a hydrostatic bearing (132) has a collar (142) that circumscribes a shaft (118) to define a fluid film annulus (150) for radially confining a load supportive fluid film. An array of pockets (152) distributed circumferentially along a bearing surface (148) communicate with vent regions (164, 164b) in which the vent pressures are not necessarily substantially unequal. Dual supply passages (176) associated with each pocket are oriented at an angle .theta. for injecting fluid into the annulus with a tangential directional component opposite to the direction of shaft rotation, and are axially offset on opposite sides of pocket array centerline (157) by offset distances .delta..sub.1, .delta..sub.2. The axial offset of the passages relative to the centerline minimizes the residence time of the fluid in the film annulus (150) and therefore expands the dynamically stable speed range of the rotor system.
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University of Southampton, Department of Mechanical Engineering, Gas Bearing Symposium, "Bearings with a Tangential Gas Supply", by Ales Tondl, Apr. 1967.
Kocur John A.
Pelfrey Philip C.
Baran Kenneth C.
Hannon Thomas R.
United Technologies Corporation
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