| 摘要 |
PROBLEM TO BE SOLVED: To achieve long service life of a bearing by preventing a load from being locally applied to an end face of a retainer of a cage-and-roller type bearing provided in an eccentric shaft, and preventing bearing performance from lowering due to deformation or damage of the retainer.SOLUTION: In a guide structure of the retainer end, the end face 13a of the retainer 13 in the cage-and-roller type bearing on the eccentric shaft 8 provided consecutively from the main shaft 9 is pressed by an outer peripheral edge 21a of a substantially doughnut-like washer 21 fitted into a main shaft 9. An outside dimension of the washer 21 is set so that an overlapping width L of the outer peripheral edge 21a of the washer 21 and the end face 13a of the retainer 13 in the radial direction of the retainer 13 is attained to be substantially equal to or more than 1/2 of height h of the end face 13a of the retainer 13 throughout the entire periphery of the end face 13a of the retainer 13. |
