Ball Screw Brake and Coupling

The axial forces created by thermal expansion of the ball screw can be large enough to preload the brake bearing and cause the device to fail prematurely. To solve that problem, Nexen has developed a spring-engaged, air-released servomotor brake made specifically for ball screws. Our device incorporates a backlash-free elastomer coupling that compensates for up to 2 millimeters of axial misalignment. The coupling is fixed into the brake bore with an expanding cone shaft. The other end of the coupling has a clamping hub that attaches to the ball screw.