DYNAMIC PRESSURE BEARING UNIT

摘要

PROBLEM TO BE SOLVED: To increase the moment load capacity of a dynamic pressure bearing unit. SOLUTION: A radial bearing surface 10a is furnished with a first A and a second dynamic pressure generation part B separately in the axial direction, which A and B are provided with flat land parts 13a and 13b continued in the circumferential direction and a plurality of dynamic pressure grooves 14a and 14b arranged inside the land parts. Maximum pressure parts 17 of dynamic pressure appear in these land parts 13a and 13b. The maximum pressure parts 17 shift outward from the axial direction centers OA and OB of the dynamic pressure generation parts A and B owing to the arrangement that the land parts 13a and 13b are located at the ends of the radial bearing surface 10a, so that the distance L between the maximum pressure parts 17 is enlarged compared with any conventional arrangement.