| 摘要 |
A device comprising a worm and a ball nut, with antifriction balls rollably engaged between their opposed screw threads to convert the rotation of either into the endwise motion of the other. Employed for the recirculation of the balls is a tubular guide providing a ball return path from one end of the ball nut to the other. The ball return guide is arcuate in shape and is mounted on the outside of the ball nut with its opposite end portions inserted in openings drilled in the ball nut in axially and circumferentially spaced positions thereon. The arcuate ball return guide is easier of manufacture, and enables the balls to travel more smoothly therethrough, than the conventional U-shaped one. |
