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Title:
DYNAMIC PRESSURE BEARING AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2017/159345
Kind Code:
A1
Abstract:
The present invention pertains to a dynamic pressure bearing in which the inner peripheral surface (8a') of a bearing material (8') is provided with: a pair of bearing surfaces (8a1, 8a2) having dynamic pressure grooves (G1, G2); a pair of first smooth surfaces (8a4, 8a5) between the bearing surfaces (8a1, 8a2) and adjacent to the bearing surfaces (8a1, 8a2); and a relief section (8a3) provided between the first smooth surfaces (8a4, 8a5), the relief section (8a3) having a larger diameter than the pair of bearing surfaces (8a1, 8a2). The dynamic pressure bearing is manufactured by pressing toward the inner diameter two axially separated regions of the outer peripheral surface (8d') of the bearing material (8'), which is cylindrical, in a state in which a core rod (11) has been inserted in the inner periphery of the bearing material (8'); the core rod (11) having on the outer peripheral surface thereof a pair of forming dies (20, 20), and a first tubular region (21) that is between the forming dies (20, 20) and adjacent to the forming dies (20).

Inventors:
HARADA Kazuyoshi (3066 Aza Oyumida, Oaza Higashikata, Kuwana-sh, Mie 78, 〒5118678, JP)
Application Number:
JP2017/007739
Publication Date:
September 21, 2017
Filing Date:
February 28, 2017
Export Citation:
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Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16C33/12; F16C17/02; F16C33/14
Foreign References:
JPH10339321A1998-12-22
JP2011247281A2011-12-08
JP2012047302A2012-03-08
JP2007327604A2007-12-20
JP2001041244A2001-02-13
JPH1137156A1999-02-09
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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