| 摘要 |
PURPOSE:To reduce decline of rigidity for increase of clearance of a bearing by arranging four rows of grooves connecting puffing-out holes for fluid to the circular direction of an inner peripheral surface of the bearing. CONSTITUTION:Air charging holes 13, 14 and grooves are respectively provided inside former two-row air charging holes 11, 12. And, although rigidity declines slightly comparing to the former-type two-row air charging when eccentricity epsilonis low, rigidity largely goes up as effect when eccentricity epsilon becomes high. The positions where the grooves are to be provide are set so that the ratio of the distance Za from the end of the bearing to the outside air charging holes 11, 12 to 1/2 of the bearing width L is to be 0.2-0.4, and similarly that the distance Zb from the end of the bearing to the inside air charging holes 13, 14 is set to 0.3-1.5 of Za. Also, rigidity increase can be expected by fixing the diameter d0 of the outside air charging holes 11, 12 to 0.2-0.9 of the diameter di of the inside air charging holes 13, 14. |
