Composite bearing structure
First Claim
1. A composite bearing structure for supporting a rotator that is adapted to rotate at a high speed, said composite bearing structure comprising:
- first bearing means (1,
2) including a ceramics sintered body for supporting a radial impact force that is applied to said rotator during rotation thereof;
second bearing means for supporting an axial load that is applied to said rotator while maintaining a prescribed clearance of said second bearing means and said rotator;
third bearing means for maintaining a radial rotational accuracy of said rotator; and
fourth bearing means for maintaining a thrust-directional rotational accuracy of said rotator.
2 Assignments
0 Petitions
Accused Products
Abstract
A composite bearing structure that has a high rotational accuracy and that can withstand high-speed rotation comprises first bearing means, second bearing means, third bearing means and fourth bearing means. The first bearing means supports a radial impact force which is applied to a rotator during rotation, and is formed by an inner ring (1) and an outer ring (2) consisting of silicon nitride ceramics sintered bodies. The second bearing means supports an axial load which is applied to the rotator while maintaining a prescribed clearance with the rotator, and is formed by a magnetic bearing body of two permanent magnets (12) and (13) which are thrust-directionally opposed to each other. The third bearing means maintains the radial rotational accuracy of the rotator, and is formed by a radial dynamic pressure producing groove (5) which is formed in a cylindrical surface of the inner ring (1). The fourth bearing means maintains the thrust-directional rotational accuracy of the rotator, and is formed by an air dome portion (100) which is confined in a semi-closed state by the inner ring (1), the outer ring (2) and a cover (4).
38 Citations
23 Claims
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1. A composite bearing structure for supporting a rotator that is adapted to rotate at a high speed, said composite bearing structure comprising:
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first bearing means (1,
2) including a ceramics sintered body for supporting a radial impact force that is applied to said rotator during rotation thereof;second bearing means for supporting an axial load that is applied to said rotator while maintaining a prescribed clearance of said second bearing means and said rotator; third bearing means for maintaining a radial rotational accuracy of said rotator; and fourth bearing means for maintaining a thrust-directional rotational accuracy of said rotator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A composite bearing comprising:
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a fixed member including a base plate and a cylindrical stub extending from said base plate; a rotatable member including a cylindrical sleeve rotatably arranged coaxially and radially outwardly around said cylindrical stub and axially adjacent said base plate, and an axial end cover axially adjacent an axial end of said cylindrical stub opposite said base plate; a radial impact supporting first bearing formed by said cylindrical sleeve rotatably arranged on said cylindrical stub, wherein at least one of said sleeve and said stub is a sintered ceramic body; an axial load supporting second bearing that is arranged between said cylindrical sleeve and said base plate and that maintains therebetween an axial clearance during rotation of said rotatable member relative to said fixed member; a radial rotational accuracy maintaining third bearing that is arranged between said cylindrical sleeve and said cylindrical stub and that maintains therebetween a radial clearance during rotation of said rotatable member relative to said fixed member; and an axial rotational accuracy maintaining fourth bearing that is arranged between said axial end of said cylindrical stub and said axial end cover; wherein said second bearing comprises at least one of a magnetic repulsion bearing and a dynamic gas pressure bearing, and said fourth bearing comprises a gas dome at least partially enclosed in a space formed between said axial end of said cylindrical stub, said axial end cover and an end portion of said cylindrical sleeve. - View Dependent Claims (23)
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Specification