Patent ID: 8955404
Filing Date: 2015-02-17
Classification: F16H,Y10T

Abstract:
1. A ball screw module, comprising: a screw shaft having an outer surface formed with a first helical rolling groove; a nut member being circumferentially disposed around the screw shaft and having an inner surface formed with a second helical rolling groove in position corresponding to the first helical rolling groove, the first helical rolling groove and the second helical rolling groove together forming a helical rolling track; a ball connector having a plurality of balls and a retainer formed with a plurality of intervals for spacing apart the balls and with linking straps for connecting the intervals in series; and a circulating device mounted on the nut member and formed with a circulating route; wherein the helical rolling track and the circulating route enable the movement of the ball connector, the circulating route has an intermediate route and connecting routes each connecting the helical rolling track with an end of the intermediate route, the circulating route is formed with two guiding sidewalls for guiding the ball connector to twist in a first rotational direction while the ball connector moving from one of the connecting routes to the intermediate route and from the intermediate route to the other one of the connecting route and to guide the ball connector to twist in a second rotational direction while the ball connector passing through the intermediate route, and the first rotational direction is opposite to the second rotational direction.