ROLLING BEARING, PIVOT ASSEMBLY BEARING, AND DISK DRIVE APPARATUS
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United States of America
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Issued Date -
Dec 19, 2024
app pub date -
Oct 25, 2022
filing date -
Oct 25, 2022
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Abstract
The application provides a rolling bearing including a grease composition, the grease composition containing a base oil and a thickener, the base oil containing an aromatic ester-based base oil, and the thickener containing a urea-based thickener, where the grease composition has a storage elastic modulus at 25° C. of from 1200 to 3000 Pa as measured under conditions of a film thickness of 1 mm and a shear strain of 1% and has an oil separation amount at 80° C. of from 200 to 270 mm2/mg; a pivot assembly bearing apparatus including the rolling bearing; and a disk drive apparatus including the pivot assembly bearing apparatus.
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