Title:
COMBINATION BEARING CONSTRUCTION
Document Type and Number:
WIPO Patent Application WO/1994/016233
Kind Code:
A1
Abstract:
A combination bearing construction capable of withstanding high-speed rotation and having a high accuracy of rotation is provided. The combination bearing construction comprises a first bearing means, a second bearing means, a third bearing means and a fourth bearing means. The first bearing means bears impulsive forces in a radial direction, which impulsive forces are exerted on a rotary body during rotation, and comprises an inner race (1) and an outer ring (2) which are formed of a silicon nitride based ceramic sintered body. The second bearing means bears a load in an axial direction with a predetermined gap maintained between it and the rotary body, which load is exerted on the rotary body, and is constituted by a magnetic bearing body which comprises two permanent magnets (12, 13) opposing each other in a thrust direction. The third bearing means serves to maintain an accuracy of rotation in a radial direction of the rotary body, and comprises radial dynamic pressure generating grooves (5) formed on a cylindrical surface of the inner race (1). The fourth bearing means serves to maintain an accuracy of rotation in a thrust direction of the rotary body, and comprises an air reservoir (100) confined in a semi-closed condition by the inner race (1), outer ring (2) and a cover (4).
Inventors:
KOMURA OSAMU (JP)
KATAYAMA TETSUYA (JP)
YAMAKAWA AKIRA (JP)
KATAYAMA TETSUYA (JP)
YAMAKAWA AKIRA (JP)
Application Number:
PCT/JP1994/000002
Publication Date:
July 21, 1994
Filing Date:
January 04, 1994
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
KOMURA OSAMU (JP)
KATAYAMA TETSUYA (JP)
YAMAKAWA AKIRA (JP)
KOMURA OSAMU (JP)
KATAYAMA TETSUYA (JP)
YAMAKAWA AKIRA (JP)
International Classes:
F16C32/00; F16C32/04; F16C17/02; F16C33/10; F16C33/24; F16C39/06; (IPC1-7): F16C32/00
Foreign References:
| JPH0431112U | 1992-03-12 | |||
| JPS6412927U | 1989-01-24 | |||
| JPS6322424U | 1988-02-15 | |||
| JPS63171724U | 1988-11-08 | |||
| JPH0431694A | 1992-02-03 | |||
| JPH0328518A | 1991-02-06 | |||
| JPH02184250A | 1990-07-18 | |||
| JPH03186608A | 1991-08-14 |
Other References:
See also references of EP 0633406A4
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