Fluid bearing and method of operation

Details Fluid bearing and method of operation Fluid bearing and method of operation

2006-04-28

2009-06-30

Hannon, Thomas R (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S107000

Reexamination Certificate

active

07553085

ABSTRACT:
A fluid bearing includes hydrostatic pads formed in a surface and positioned to exert a separating force, and a land formed on the surface of the insert and configured to act as a bushing to allow rotation while the first and second pads are pressurized at less than a hydrostatic balance force. Pressurized fluid to the pads of the insert is controlled to prevent operation in full hydrostatic mode. More particularly, a separating force generated by surface force of the pads is controlled such that the separating force does not exceed a force exerted on the bearing. The fluid pressure is also controlled to keep the separating force within a selected margin of the force exerted on the bearing, to control wear of the bearing. Control of the separating force is achieved by selectively pressurizing individual hydrostatic pads, thereby effectively varying the active hydrostatic area of the bearing.

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