The total no-load torque (T0) of a ball screw drive consists of two main components: the no-load torque of the nut without seals (Tpr0) and the no-load torque of the two seals (TRD). These friction torque values are crucial for the efficiency and performance of the ball screw drive.
The no-load torque of the nut without seals (Tpr0) describes the frictional resistance caused by the movement of the balls within the nut. This value is an important indicator of the mechanical quality and precision of the ball screw drive. TRD (no-load torque of the seals), by contrast, results from the additional resistance generated by the sealing rings (wipers). Although these seals are associated with a certain amount of friction loss, they reliably protect the system from the ingress of dirt and thereby extend service life and operational reliability.
Combining these two values (Tpr0 and TRD) yields the total no-load torque (T0), which provides a comprehensive insight into friction losses and the efficiency of the system.