滚珠丝杠, 转速, 摩擦力矩波动, 预紧力

According to Hertz contact theory,this paper discussed the elastic deformation in the ball screw systems and elastic potential energy caused by it.Force and kinetic energy analysis were carried out on the balls in the screw groove and recirculating mechanism.The text deduces that when the ball is pushed into the screw groove, there is a critical speed due to its kinetic energy, if ball’s speed is less than the critical speed, the friction torque fluctuation is large, and when it is higher than the critical speed, the force changes,the friction torque fluctuation has a tendency to reduce because of the force changing. And the experimental data validates the friction torque fluctuated at different speeds.