Patent ID: 7845251
Filing Date: 2010-12-07
Classification: F16H,Y10T

Abstract:
1. A roller screw having plural circulating devices cooperating with plural helical grooves, comprising: a screw being provided in a surface thereof with at least two helical grooves; a nut being provided with helical grooves opposite to the screw and further axially provided with receiving holes in a peripheral wall, the receiving holes and the helical grooves of the nut being equal in number, and each receiving hole having a fixing groove at each of two ends thereof; plural rollers being respectively arranged in the helical grooves of the screw and the nut; circulating devices being equal in number to the helical grooves of the screw, each circulating device having an opening at each of two ends thereof and a passage between the two openings, the circulating devices being installed in the respective receiving holes and fixing grooves of the nut; and the two openings of the respective circulating devices, which are connected to the helical grooves, are connected to different helical grooves of the nut, so that the helical grooves of the nut form a single circulation path for the rollers through the respective circulating devices.