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Title:
FLUID DYNAMIC PRESSURE BEARING DEVICE AND MOTOR HAVING SAME
Document Type and Number:
WIPO Patent Application WO/2019/065719
Kind Code:
A1
Abstract:
This fluid dynamic pressure bearing device is provided with: a cylindrical oil holding space 13 which is provided between an upper end outer peripheral section of a bearing member 8 and a cylindrical section of a housing 7, and which can hold the oil surface of a lubrication oil 11; and an axial gap 22 which is formed on an upper end surface 8c of the bearing member 8 and has a radially inside end portion connected to a seal gap S. An annular section 71b in contact with the upper end surface 8c of the bearing member 8 is provided, and the oil holding space 13 and the axial gap 22 are communicated through a second passage 22 formed as a groove section provided in at least one among the upper end surface 8c of the bearing member 8 and a lower end surface 71b1 of the annular section 71b, the lower end surface 71b1 contacting the upper end surface 8c.

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Inventors:
OKA Shouhei (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
HARADA Kazuyoshi (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
HIRADE Jun (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
ARAI Takao (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
YAMAGOU Masashi (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
SONG Yuanshuang (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
Application Number:
JP2018/035651
Publication Date:
April 04, 2019
Filing Date:
September 26, 2018
Export Citation:
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Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16C17/10; F16C33/10; H02K5/167; H02K7/08
Foreign References:
JP2009180295A2009-08-13
JP2001271828A2001-10-05
JP2008306916A2008-12-18
Attorney, Agent or Firm:
SHIROMURA Kunihiko et al. (Ehara Patent Office, 2-15 Bakurou-machi 4-chome, Chuo-ku, Osaka-sh, Osaka 59, 〒5410059, JP)
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