High speed hydrostatic spindle design

Details High speed hydrostatic spindle design High speed hydrostatic spindle design

1994-03-10

1995-11-14

Footland, Lenard A.

Bearings

Rotary bearing

Fluid bearing

384111, 384315, F16C 3206

Patent

active

054660718

ABSTRACT:
A novel means for the design of the pockets of a hydrostatic spindle and the flow supply, collection, and pocket injection means to allow for very high speed rotation with a minimum of heat generation, mid maximum load capacity; furthermore the concept of self compensation is used to make the design insensitive to contaminants and thereby allow for the use of water based hydrostatic fluids, whereas the design of the compensator region is also advanced to facilitate high speed use. Accordingly, the present invention allows designers to increase the allowable speed and accuracy of rotary motion hydrostatic bearings. Design methodologies are presented for designing self compensating hydrostatic bearing spindle pockets and compensators to minimize the effects variation in stiffness with angular position, cavitation in bearing pockets, and turbulent shear power generation. Although it may seem that these are unrelated effects, the design solutions required substantially overlap and are thus presented together here. The primary issue in all of the design advancements is that the flow must be kept from separating, which will induce cavitation. This will result in wear and erosion of the bearing surfaces which will lead to bearing failure. Cavitation is prevented by the use of gently changing shapes, and the introduction of pressure at locations in the bearing where left to itself, the flow would separate and create a low pressure cavitating region.

REFERENCES:
patent: 3717392 (1973-02-01), Ennis
patent: 4371216 (1983-02-01), Suzuki et al.
patent: 4710035 (1987-12-01), Vaughn
patent: 5281032 (1994-01-01), Slocum

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