Development of a new type of transmission screw nut with high efficiency and heavy duty characteristics

Abstract

A new approach for high efficiency and heavy-duty screw transmission was presented and studied. It is characterized by a steel base and a lining made of carbon fabric enforced polymer self-lubrication composite material lining on the thread surface. The spiral surface layer was fabricated by net-shape forming instead of traditional machining. Oil grooves were also implemented in forming. By nut contour structure optimization, the loads on every screw fillet are well distributed, decreasing the maximum loads on fillets. This type of screw nut has excellent anti-friction and wear-resisting performance as well as high burden ability. The experiments showed that the composite nuts had excellent tribology properties under heavy-duty conditions. Frictional torque on the composite nut decreased by 53.5 per cent and transmission efficiency increased by 48.65 per cent compared with bronze nuts. The development of the new type of sliding screw nut not only plays an important role for alternating current servo press development, but also has revolutionary significance for all mechanical equipment using screw transmission.