Patent ID: 7640821

Claim:
A circulating member for a ball screw being disposed on a nut which is provided with gothic arch threads, the circulating member is formed with a return path which is connected to the threads of the nut for enabling balls to circulate, characterized in that: a connecting port for connecting the threads of the nut is formed at each end of the return path of the circulating member, and the connecting port is shaped in the form of a pointed arch; the return path is inconstant in cross section, a middle portion of the return path is circular arch-shaped in cross section and both ends of the return path is pointed arch-shaped in cross section; and wherein a part of the return path where the connecting port is located is gothic arch-shaped, and a part of the circulating path is circular arc-shaped in cross section, and a part of the return path where the balls pass through a thread ridge of a thread of the screw shaft is circular arc-shaped in cross section.