Title:
BEARING DEVICE AND METHOD OF MANUFACTURING THE BEARING DEVICE
Document Type and Number:
WIPO Patent Application WO/2000/075522
Kind Code:
A1
Abstract:
A bearing device having dynamic pressure bearing with less variation in bearing clearance according to a variation in service temperature and a corrosiveness and a sufficient hardness on the surface of a shaft, wherein a sleeve (4) is made of copper alloy, a solution-heat-treated austenitic stainless steel is used as the material of the shaft (1) and, after the stainless steel is machined in a shaft body, a carburization treatment is applied to the shaft body so as to form a carburized hard layer on the surface of the shaft, and then the shaft high in surface hardness and excellent in bearing surface roughness is used so as to increase the durability of the bearing device with dynamic pressure bearing against starting and stopping, and also the coefficient of thermal expansion of the material forming the sleeve is reduced to below that of the material forming the shaft so as to improve the rigidity of the bearing at high temperatures.
Inventors:
TANAKA SUSUMU (JP)
KUDO TOMOHIRO (JP)
TANAKA KATUHIKO (JP)
OHORI MANABU (JP)
KUDO TOMOHIRO (JP)
TANAKA KATUHIKO (JP)
OHORI MANABU (JP)
Application Number:
PCT/JP2000/003614
Publication Date:
December 14, 2000
Filing Date:
June 02, 2000
Export Citation:
Assignee:
NSK LTD (JP)
TANAKA SUSUMU (JP)
KUDO TOMOHIRO (JP)
TANAKA KATUHIKO (JP)
OHORI MANABU (JP)
TANAKA SUSUMU (JP)
KUDO TOMOHIRO (JP)
TANAKA KATUHIKO (JP)
OHORI MANABU (JP)
International Classes:
C23C8/22; F16C17/22; F16C33/10; F16C33/12; F16C33/14; (IPC1-7): F16C17/10; C23C8/32; F16C17/22; F16C33/12; F16C33/14
Foreign References:
| JPH1089345A | 1998-04-07 | |||
| JPH09302456A | 1997-11-25 | |||
| JPH10330906A | 1998-12-15 | |||
| JPH09249959A | 1997-09-22 | |||
| JPS62125351U | 1987-08-08 | |||
| JP2000161346A | 2000-06-13 |
Attorney, Agent or Firm:
Mori, Tetsuya (8th Floor 7 Kanda-Kajicho 3-chome Chiyoda-ku, Tokyo, JP)
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