In the ball screw pair, prestressing force on the nut can improve the ball screw pair of axial stiffness and positioning accuracy. So if only consider the stiffness and positioning accuracy of screw pair, is obviously the better, the greater the pretightening can better eliminate caused by elastic deformation of axial clearance. And the pre-tightening force is too small even eliminating axial clearance, but not necessarily improve the rigidity. Because the pre-tightening force of prestressing nut must be sufficient to eliminate the existence of 'low stiffness zone'. Because of the double nut and tighten screw and nut mean there is error between components (As the lead error, etc. ), and may produce a tighter after a short period of contact deformation, the contact rigidity is high, and a little looser after a short period of contact deformation, contact with low stiffness. The latter the so-called 'low stiffness zone'. To increase the contact stiffness, and axial pre-tightening force must be large enough, in order to eliminate the existence of this kind of 'low stiffness area', can we truly achieve the purpose of raise the axial stiffness. Prestressing force, however, too much is harmful and it will increase the driving moment, reduce the transmission efficiency, intensified between the ball and raceway contact fatigue and wear, shorten service life.
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