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US 8,007,181 B2Granted
Rolling bearing
AssigneeNsk Ltd.
InventorsKenichi Iso, Yujiro Toda, Yoichi Imamura
Life of this patent
Estimating the term…
Abstract
A grease composition having an apparent viscosity at −30° C. of 5 to 200 Pa·s is sealed in a rolling bearing which retains a plurality of rolling elements between an inner ring and an outer ring in such a way that the rolling elements can freely roll. Thereby, there is provided a rolling bearing which has a satisfactory lubricating performance and generates less abnormal noise even under a low temperature of around −40° C.
Claims3
A rolling bearing, comprising a plurality of rolling elements rotatably held between an inner ring and an outer ring, wherein
- a grease, of which composition has an apparent viscosity of 5 to 100 Pa·s at −30° C. after 200 seconds of rotation, is sealed in the bearing, the grease including:
- a thickening agent having a urea compound, and
- a base oil having kinetic viscosity at 40C° in the range of 10 to 250 mm2/s;
- wherein the base oil in the grease is one of ester oil, ether oil and PAO, or a mixture thereof;
- wherein the thickening agent in the grease is diurea compound;
- wherein an amount of the thickening agent in the grease is in the range of 14 to 22 wt%;
- and
- wherein the rolling bearing is used at temperature under −30 C° .
5 more elements
Dependencies are inferred from the claim text.