초록 ▼

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

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).

대표청구항 ▼

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; s

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.