Ball screw for converting rotating movement into translational movement, has spindle nut arranged on threaded spindle and hydraulically-loaded with pressure for pressure-dependent radial contraction of channel in which balls are arranged

摘要

The screw has a spindle nut (1) arranged on a threaded spindle (2), and balls that are arranged in a ball channel (5), where the channel is limited by ball grooves (3, 4) of the spindle nut and the threaded spindle. The spindle nut is hydraulically-loaded with pressure for pressure-dependent radial contraction of the ball channel. A ring (8) arranged on the spindle nut is provided with a pressure chamber (9) containing hydraulic fluid e.g. oil. The spindle nut is made from steel, and the ring is made from aluminum or material with high thermal expansion coefficient.