グリース組成物、ピボットアッシー軸受および該軸受を備えた軸受装置

Japanese Patent JP7401717

B2

[Problem] To provide: a grease composition for a pivot assembly; a pivot assembly bearing in which the grease composition is sealed; a bearing device which, due to use of the grease composition and the bearing, can suppress the adhesion of volatile components to a magnetic disk even when the grease composition is volatilized, and thus can suppress the occurrence of hard disk drive read/write errors; and a driving device comprising the bearing device. [Solution] Provided are: a grease composition for pivot assembly bearings which comprises an aromatic ester base oil and a thickening agent, wherein the aromatic ester base oil has, as a substituent on the ring thereof, the ester group *-(CO)O- (where * represents the bonding site with the aromatic ring), and includes an aromatic ester compound in which an alkyl group having not less than eight total carbon atoms binds to an oxygen atom of the ester group; a pivot assembly bearing in which the grease composition for pivot assembly bearings is sealed; a bearing device which comprises the pivot assembly bearing; and a disk driving device which is equipped with the bearing device.

Motojiro Tsuna
Jun Hachimachi
Takanori Shinkai

JP2023543242A

December 19, 2023

October 25, 2022

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MinebeaMitsumi Inc.

C10M105/32; C10M105/36; C10M169/02; C10M169/04; F16C19/06; F16C33/66; F16C35/12; G11B19/20; G11B21/02; G11B33/12

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Patent Attorney Corporation Hanabusa Patent and Trademark Office

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