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US 8,703,675 B2Granted
Bearing grease composition
AssigneeSaint-Gobain Performance Plastics Corporation
InventorsTimothy J. Hagan, Vincent DiMartino
Life of this patent
Estimating the term…
Abstract
A grease for use in fluid bearings can be made by combining a synthetic oil and a paraffinic wax. The grease can adhere to polymeric surfaces on bearings such as PTFE and can improve service life in high speed bearings such as those used in electric motors.
Claims18
A high speed bearing grease composition comprising:
- more than 50% by volume of an oil fraction, wherein the oil fraction has a complex viscosity between 0.003 Pa s and 0.05 Pa s at 40 deg C.;
- more than 10% by volume of a paraffin wax, wherein the paraffin wax has a melting point in the range between 75 deg C. and 125 deg C.;
- and
- more than 5% hydrocarbon based oil stabilizer by volume, the oil stabilizer having a higher viscosity than the oil fraction, wherein the hydrocarbon based oil stabilizer comprises at least one alkanes from the group of C12 to C22, C23, C26, C27, and C28 alkanes, wherein the high speed bearing grease composition is essentially free of metallic soaps and polyurea.
1 more element
A bearing grease composition comprising:
- more than 60% by volume of an oil fraction comprising a hydrocarbon;
- wherein the oil fraction has a complex viscosity at 100° C. from 0.05 Pa-s to 0.003 Pa-s,
- more than 10% by volume of a paraffin wax, wherein the paraffin wax has a melting point in the range of 75° C. to 125° C.;
- and
- more than 5% hydrocarbon based oil stabilizer by volume, the oil stabilizer having a higher viscosity than the oil fraction, wherein the hydrocarbon based oil stabilizer comprises at least one alkanes from the group of C12 to C22, C23, C26, C27, and C28 alkanes,
- wherein the dynamic viscosity of the bearing grease is 10 times greater at 40° C. than at 70° C.,
- wherein the high speed bearing grease composition is essentially free of metallic soaps and polyurea.
4 more elements
A high speed bearing grease composition comprising:
- more than 60% and less than 70% synthetic hydrocarbon by volume, wherein the synthetic hydrocarbon comprises a polyalphaolefin having a D-445 viscosity of less than 100 cSt at 100° C.;
- more than 15% paraffin wax by volume, wherein the paraffin wax has a melting point in the range of 75 to 125° C.;
- and
- more than 5% hydrocarbon based oil stabilizer by volume, wherein the hydrocarbon based oil stabilizer comprises at least one alkanes from the group of C12 to C22, C23, C26, C27, and C28 alkanes, wherein the high speed bearing grease composition is essentially free of metallic soaps and polyurea.
1 more element
Dependencies are inferred from the claim text.