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Patent Searching and Data


Title:
FLUID DYNAMIC PRESSURE BEARING DEVICE AND MOTOR PROVIDED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2019/159787
Kind Code:
A1
Abstract:
This fluid dynamic pressure bearing device 1 is provided with: a bottomed cylindrical housing 7; a bearing sleeve 8; a shaft member 2 having a shaft part 2a that is inserted into the inner circumference of the bearing sleeve 8 in a removable manner; an annular part 9 which forms a radial gap Ga between itself and the outer circumferential surface of the shaft member 2; radial bearing parts R1, R2; a thrust bearing part T; and a bottom gap Gb which houses the thrust bearing part T. A part of the internal space of the housing 7 is filled with a lubricant oil 11; and the remaining region of the internal space including the radial gap Ga forms a void part that is not filled with the lubricant oil 11. The outside diameter d4 of a second portion 2b1 of the outer circumference of the shaft member 2, said second portion 2b1 facing the inner circumferential surface 9a of the annular part 9, is larger than the outside diameter d3 of a first portion 2a1 of the outer circumference of the shaft member 2, said first portion 2a1 facing the inner circumferential surface 8a1 of the bearing sleeve 8.

Inventors:
OOSHIMA Tadashi (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
Application Number:
JP2019/004234
Publication Date:
August 22, 2019
Filing Date:
February 06, 2019
Export Citation:
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Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16C33/10; F16C17/02; F16C33/74
Foreign References:
JP2014059014A2014-04-03
JP2008138846A2008-06-19
JP2004197889A2004-07-15
JP2004116623A2004-04-15
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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