... .easy to process, low manufacturing cost, with self-locking function,4.the frictional torque, the transmission efficiency is low (30% ~ 40%). 5 ... , but its biggest advantage is that the frictional torque, high transmission efficiency (92% ~ 98%), high accuracy,6. the system stiffness, movement ... therefore a large number of widely used in mechatronic systems. automatic transmission shaft gearbox parts