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US 4,830,767 AGranted
Front-wheel drive grease
AssigneeAmoco Corporation
InventorJohn A. Waynick
Life of this patent
Estimating the term…
Abstract
A high performance lubricating grease effectively lubricates and greases front-wheel drive joints. The front-wheel drive grease has excellent extreme pressure properties and antiwear qualities and is economical, nontoxic and safe. In the pereferred form, the front-wheel drive grease comprises a base oil, a polyurea thickener, and an additive package comprising tricalcium phosphate and calcium carbonate.
Claims6
A lubricating grease, comprising:
- a substantial proportion of a base oil;
- a thickener comprising a member selected from the group consisting of biurea, triurea, and polyurea;
- and
- a combined carbonate and phosphate additive package comprising both a carbonate and a phosphate in the absence of insoluble arylene sulfide polymers and oil soluble sulfur-containing compounds, said carbonate selected from the group consisting of a carbonate of a Group 1a alkali metal and a carbonate of a Group 2a alkaline earth metal and said phosphate selected from the group consisting of a phosphate of a Group 1a alkali metal and a phosphate of a Group 2a alkaline earth metal;
- said carbonate interacting with said phosphate in the absence of sulfur-containing compounds for enhancing the performance of said grease;
- said alakaline earth metal being selected from the group consisting of beryllium, magnesium, calcium, strontium, and barium;
- and
- said alkali metal being selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, and francium.
5 more elements
A lubricating grease, comprising:
- at least 70% by weight base oil;
- from about 7% to about 12% by weight polyurea thickener;
- and
- an extreme pressure wear-resistant mixture providing an additive package, said additive package consisting essentially of tricalcium phosphate and calcium carbonate in the absence of sulfur-containing compounds and arylene sulfide polymers, said tricalcium phosphate and said calcium carbonate interacting with each other to enhance the extreme pressure wear-resistant properties of said grease;
- said tricalcium phosphate being present in an amount ranging from about 3% to about 10% by weight of said grease;
- and
- said calcium carbonate being present in an amount ranging from about 3% to about 10% by weight of said grease.
4 more elements
Dependencies are inferred from the claim text.