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US 6,802,648 B2Granted
Polymeric bearing with elastomer
AssigneeE. I. Du Pont de Nemours and Company
InventorsPhilippe Merot, Jean Luc Bozet, Pierre Poysat
Life of this patent
Estimating the term…
Abstract
A bearing system for a rotor shaft is provided in which a bearing prepared from a high performance polymer is surrounded by an elastomer sleeve that dampens the effect of noise and vibration caused by movement of the rotor shaft against the bearing.
Claims20
A bearing system for a rotating shaft having a centerline, comprising
- (a) a bearing having a cylindrical space in which the shaft rotates, the cylindrical space having a centerline, the bearing being prepared from a polymer having a wear value of in the range of about 2×10−6 to about 2×10−5 mm3/hr when determined at a PV value in the range of about 0.01 to about 2.5 MPa·m/s;
- and
- (b) a sleeve having a uniform wall thickness and a cylindrical space in which the bearing resides in an interference fit, the sleeve being prepared from an elastomer having a tan delta value of at least about 0.02 when determined at a temperature in the range of about 20 to about 30° C.;
- wherein the rotation of the shaft is not lubricated, and the sleeve is compressible by movement of the shaft during which the centerline of the shaft is parallel to the centerline of the bearing.
1 more element
A bearing system for a rotating shaft having a centerline, comprising
- (a) a bearing having a cylindrical space in which the shaft rotates, the cylindrical space having a centerline, the bearing being prepared from a polymer having a coefficient of friction about 0.3 or less when determined at a PV value in the range of about 0.01 to about 2.5 MPa·m/s;
- and
- (b) a sleeve having a uniform wall thickness and a cylindrical space in which the bearing resides in an interference fit, the sleeve being prepared from an elastomer having a tan delta value of at least about 0.02 when determined at a temperature in the range of about 20 to about 30° C.;
- wherein the rotation of the shaft is not lubricated, and the sleeve is compressible by movement of the shaft during which the centerline of the shaft is parallel to the centerline of the bearing.
1 more element
Dependencies are inferred from the claim text.