| 摘要 |
PROBLEM TO BE SOLVED: To improve bearing function by providing lubricating oil supply holes of inner and outer rings with a throttle part, providing a floating ring with a cavity part, and providing a set clearance between the floating ring and the outside diameter surface of the inner ring. SOLUTION: A cavity part 7 is provided in the circumferential direction of the central area of an inside diameter surface 6a, and the inner ring 1 is provided with a radial oil hole 1a extending from an oil groove 1b to the outside diameter side, and a throttle part 9 which becomes resistance to the oil hole 1a. By setting the guide clearance 8 (h) between the inside diameter surface 6a of a floating ring 6 and the outside diameter surface 1d of the inner ring 1 to the optimum value, the floating ring 6 can be floated as a static pressure oil bearing. Accordingly, the floating ring 6 is floated simultaneously with feeding of lubricating oil from the oil hole 1a through the throttle part 9, so that there is no contact with the outside diameter surface 1d of the inner ring 1 and starting torque to the rotation of the bearing (roller revolution) is small to enable smooth rotation. |
