Title:
FLUID DYNAMIC PRESSURE BEARING OIL, SPINDLE MOTOR, AND DISK DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/074698
Kind Code:
A1
Abstract:
[Problem] To provide a fluid dynamic pressure bearing oil and a fluid dynamic pressure bearing having the same sealed therein. Further, to provide: a spindle motor which, by having the fluid dynamic pressure bearing oil and bearing applied therein, is capable of suppressing adhesion of a volatile component to a magnetic disk, etc., even when the fluid dynamic pressure bearing oil is volatilized, and which can also suppress HDD reading and writing error occurrence; and a disk drive device comprising the same. [Solution] Provided is a fluid dynamic pressure bearing oil which comprises at least one compound selected from the group consisting of a monoester compound represented by formula (1) and a diester compound represented by formula (2). (1): R1-C(=O)O-R2 (In formula (1), R1 is an alkyl group having a total of ten or more carbon atoms, and R2 is an alkyl group having a total of nine or more carbon atoms.) (2): R3-E1-R4-E2-R5 (In formula (2), R3 and R5 are each independently an alkyl group having a total of eight or more carbon atoms; R4 is an alkylene group having a total of four or more carbon atoms; and E1 and E2 each independently represent -C(=O)O- or -OC(=O)-.)
Inventors:
TSUNA MOTOJIRO (JP)
HATCHO JUN (JP)
KITAJIMA TAKUYA (JP)
HATCHO JUN (JP)
KITAJIMA TAKUYA (JP)
Application Number:
PCT/JP2022/039765
Publication Date:
May 04, 2023
Filing Date:
October 25, 2022
Export Citation:
Assignee:
MINEBEA MITSUMI INC (JP)
International Classes:
C10M105/34; C10M105/36; C10M129/10; F16C17/02; F16C17/04; G11B19/20; G11B33/12; C10N30/00; C10N40/02
Domestic Patent References:
| WO2019082865A1 | 2019-05-02 | |||
| WO2016084781A1 | 2016-06-02 |
Foreign References:
| JP2019073666A | 2019-05-16 | |||
| JP2014227474A | 2014-12-08 | |||
| JP2005290256A | 2005-10-20 | |||
| JP2007039496A | 2007-02-15 | |||
| JP2013079357A | 2013-05-02 | |||
| JP2008007741A | 2008-01-17 | |||
| JP2021087279A | 2021-06-03 | |||
| JP2021136049A | 2021-09-13 | |||
| JP2016150954A | 2016-08-22 |
Attorney, Agent or Firm:
HANABUSA PATENT & TRADEMARK OFFICE (JP)
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