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Fluid bearing

  • US 4,808,070 A
  • Filed: 08/17/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 08/17/1987
  • Status: Expired due to Term
First Claim
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1. A bearing comprising:

  • (a) a support having a longitudinally extending bore, generally circular in cross-section at any point, said bore being of a predetermined diameter and defining an inner surface, said support being disposed within a gaseous atmosphere and including longitudinally spaced faces;

    (b) an elongated generally cylindrical shaft rotatable within said bore of the support, said shaft being of a predetermined diameter less than the diameter of said bore in said support and defining an outer surface, said outer surface of said shaft having;

    (i) a plurality of circumferentially spaced, longitudinally extending recesses of a predetermined depth, each said recess defining an elongated, generally radially outwardly extending step of a predetermined height; and

    (ii) a plurality of circumferentially spaced, longitudinally extending grooves of a predetermined depth disposed proximate said steps, said grooves including an end portion extending beyond one of said longitudinally spaced faces of said support into said gaseous atmosphere whereby gas will be drawn into said recesses upon rotation of said shaft relative to said support, at least one end of each of said grooves being in communication with a source of fluid at a predetermined pressure.

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