| 摘要 |
A high-rigidity dynamic pressure bearing capable of realizing stable high-speed rotation, wherein a total radial clearance in diameter direction is reduced to approx. 3 mu m or less to avoid a contact between members at a thrust bearing part, the thrust bearing part is formed in a pump out type, desirably an inclined groove is provided in the surface of a component member of a radial bearing part, and sufficient fluid is fed to the thrust bearing part, the arrangement of the groove at the radial bearing part leads to the elimination of half whirling, a ratio of the groove to a bearing diameter, should desirably be set to 0.005 or less, the radial clearance is expanded smoothly from the axial center to the end of a shaft, the shaft and a sleeve are rotated by applying an energizing force to allow the shaft and sleeve to be inclined relatively to each other so as to provide a high-rigidity, stable rotation, and a pair of thrust bearings are disposed axially on both sides of the radial bearing part so as to provide a dynamic pressure bearing with a high bearing rigidity. <IMAGE> |
