| 摘要 |
PURPOSE:To get rid of the stagnation of balls and the generation of noise and improve rotation transmitting efficiency by forming a ball circulating passage through a ball gear and providing an inside guide on the connecting portion between a ball track groove and the ball circulating passage. CONSTITUTION:A ball circulating passage 4 is formed through a ball gear 2. A bent guide hole 10 is provided on the connecting portion between a ball track groove 3 and the ball circulating passage 4 to provide an inside guide 9 for gradually changing the direction of moving balls 7. An inclined ball guide face 12 which gradually changes the direction of moving balls 7 and pushes in same is provided on a side ring 11. This ball guide face 12 is conformed to the final end and starting point of the ball track groove 3. Thereby, the stagnation of balls and the generation of noise can be prevented improving transmission efficiency. |
