| 摘要 |
A ball screw device of a screw axis with a helical groove on its outer circumference for balls to circulate thereon includes a nut with a helical groove on its inner circumference for balls to circulate thereon, a number of balls to circulate in an orbit along the helical groove of the screw axis and the helical groove of the nut, and a tunnel raceway for the balls to circulate unlimitedly. The device has a through-hole formed within the wall of the nut for the balls to circulate from one end of the helical groove to the other end, the through-hole having a guidepath on either end of the helical groove to feed the balls into the tunnel raceway. Means are provided between the helical groove on one end face of the nut and the helical groove on the screw axis to prevent the balls from exiting either helical groove. |
