| 摘要 |
A device for convering rotary to linear motion is composed of at least one ring surrounding a shaft or tube with balls running in a part-helical track in the ring or shaft. The balls are radially pre-loaded and a slot intersects the end and the start of the track to provide punctiform ball contact zones. One ball is then transferred at a time free of load from the end to the start of the track as the ring rotates. Side covers have profiles on their inner surfaces to control laterally the ball being transferred. |
