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US 5,289,067 AGranted
Bearing device
AssigneeNsk Ltd.
InventorsKatsuhiko Tanaka, Ikunori Sakatani, Takeyuki Yoshiba, Shigeru Endo
Life of this patent
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Abstract
A bearing device comprising a fixed shaft having a first radial bearing surface, a sleeve provided in a fitting relationship with the fixed shaft and having a second radial bearing surface opposed to the first radial bearing surface, the second radial bearing surface having herring-bone grooves thereon to form a radial gas bearing to support the sleeve with respect to the fixed shaft, and the fixed shaft having one end portion forming part of a magnetic thrust bearing of aspirating type to support the sleeve with respect to the fixed shaft.
Claims13
A bearing device comprising:
- a fixed shaft having a first radial bearing surface;
- and
- a rotational sleeve supported about said shaft in a fitting relationship therewith and having a second radial bearing surface opposed to the first radial bearing surface,
- at least one of the first and second radial bearing surfaces having herringbone grooves thereon to form a radial gas bearing to support the sleeve with respect to the fixed shaft,
- the fixed shaft having one end portion forming part of a magnetic thrust bearing of aspirating type to support the sleeve with respect to the fixed shaft,
- the radial gas bearing having a first radial bearing gap while the magnetic thrust bearing having a second radial bearing gap in communication with said first radial bearing gap and such that the second radial bearing gap is larger than the first bearing gap.
3 more elements
A bearing device comprising:
- a fixed shaft having a first radial bearing surface;
- and
- a rotational sleeve supported about said shaft in a fitting relationship therewith and having a second radial bearing surface opposed to the first radial bearing surface,
- at least one of the first and second radial bearing surfaces having herringbone grooves thereon to form a radial gas bearing to support the sleeve with respect to the fixed shaft,
- the fixed shaft having one end portion forming part of a magnetic thrust bearing of aspirating type to support the sleeve with respect to the fixed shaft,
- the radial gas bearing having a first radial bearing gap while the magnetic thrust bearing having a second radial bearing gap in communication with said first radial bearing gap and such that the second radial bearing gap is larger than the first bearing gap,
- said fixed shaft being made of a non-magnetic material and said end portion thereof being an upper end portion to which a permanent magnet is secured, and said sleeve being made of a non-magnetic material and having a portion to which a ring-shaped magnetic member is secured in a mating relationship with the permanent magnet.
4 more elements
A bearing device comprising:
- a fixed shaft having a first radial bearing surface;
- and
- a rotational sleeve supported about said shaft in a fitting relationship therewith and having a second radial bearing surface opposed to the first radial bearing surface,
- at least one of the first and second radial bearing surfaces having herringbone grooves thereon to form a radial gas bearing to support the sleeve with respect to the fixed shaft,
- the fixed shaft having one end portion forming part of a magnetic thrust bearing of aspirating type to support the sleeve with respect to the fixed shaft,
- the radial gas bearing having a first radial bearing gap while the magnetic thrust bearing having a second radial bearing gap in communication with said first radial bearing gap and such that the second radial bearing gap is larger than the first bearing gap.
- said end portion of the fixed shaft being an upper end portion thereof made of a magnetic material and said sleeve carrying on an inner face thereof a permanent magnet, said upper end portion being in a mating relationship with the permanent magnet.
4 more elements
Dependencies are inferred from the claim text.