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US 2018/0003233 A1Published application
Grease composition-filled ball bearing, pivot assembly bearing including the ball bearing, and hard disk drive including the pivot assembly bearing
AssigneeMINEBEA MITSUMI Inc.
InventorMotojiro TSUNA
Life of this patent
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Abstract
A ball bearing according to the present invention is filled with a grease composition. The grease composition contains a synthetic oil other than a synthetic hydrocarbon oil, a synthetic hydrocarbon oil, a mineral oil, and a urea compound. The synthetic oil other than the synthetic hydrocarbon oil is contained in an amount of 10% by mass or more and 60% by mass or less when the total of the synthetic oil other than the synthetic hydrocarbon oil, the synthetic hydrocarbon oil and the mineral oil is taken as 100% by mass.
Claims17
A ball bearing which is filled with a grease composition,
- the grease composition comprising a synthetic oil other than a synthetic hydrocarbon oil, a synthetic hydrocarbon oil, a mineral oil and a urea compound, wherein
- the synthetic oil other than the synthetic hydrocarbon oil is contained in an amount of 10% by mass or more and 60% by mass or less when a total of the synthetic oil other than the synthetic hydrocarbon oil, the synthetic hydrocarbon oil and the mineral oil is taken as 100% by mass.
Dependencies are inferred from the claim text.