| 摘要 |
This joint cross coupling (10) is provided with: a joint cross (1) having four shaft sections (3) disposed in a cross shape; a plurality of needle-shaped rollers (6) that roll at the outer peripheral surface of each shaft section (3); a bearing cup (5) that has a cylindrical section (5a) and a floor section (5b) occluding the opening at one end side of the cylindrical section (5a) and that is fitted to the outside of the shaft sections (3) with the needle-shaped rollers (6) therebetween; and yokes (21, 23) at which bearing holes (22, 24) into which the bearing cup (5) is inserted are provided. The needle-shaped rollers (6) are maintained in the state of being tightly fitted between the shaft sections (3) and the bearing cup (5). A protrusion (5d) that protrudes in a curved shape to the inside in the radial direction of the cylindrical section (5a) is provided to the inner peripheral side of the cylindrical section (5a), and the top surface of the protrusion (5d) contacts the needle-shaped rollers (6) in a range of the axial direction of the needle-shaped rollers (6) including the center in the axial direction. |
