Title:
A fluid kinetic pressure bearing device and a spindle motor
Document Type and Number:
Japanese Patent JP6034643
Kind Code:
B2
Abstract:
There is provided a fluid dynamic pressure bearing apparatus including a shaft, a bearing sleeve rotatably supporting the shaft, and a lubricating oil filled between the shaft and the bearing sleeve, wherein at least one of the shaft and the bearing sleeve is formed of a copper alloy containing 0.8 wt % to 5 wt % of lead, and a base oil of the lubricating is a member selected from the group consisting of monoester, dibasic acid diester, diol ester and mixtures thereof, and the lubricating oil contains 0.1 wt % to 1 wt % of condensed phosphate ester. The fluid dynamic pressure bearing apparatus is capable of suppressing the hydrolysis of the lubricating oil, and the wear of the shaft and the bearing sleeve.
Inventors:
Hachimachi Jun
Fujio Hideo
Fujio Hideo
Application Number:
JP2012222416A
Publication Date:
November 30, 2016
Filing Date:
October 04, 2012
Export Citation:
Assignee:
Minebea Co., Ltd.
International Classes:
F16C33/12; C10M105/34; C10M105/36; C10M105/38; C10M137/04; C10M169/04; F16C17/02; H02K7/08
Domestic Patent References:
| JP2009035705A | ||||
| JP2004051719A | ||||
| JP11269475A | ||||
| JP2010180331A | ||||
| JP59075995A | ||||
| JP2003097557A |
Foreign References:
| WO2011118707A1 | ||||
| US20060252659 |
Attorney, Agent or Firm:
Kijuro Kawakita