Plastic helical gear and steel worm pair is a transmission mechanism in which plastic helical gear is substituted for metal helical gear to transmit power and movement. In the transmission process of worm and helical gear drive, there is large relative velocity on the meshing area and that the plastic gear is sensitive to the environment temperature and humidity and liable to lead to failure. So it is necessary to conduct theoretical analysis and experimental research, and to establish contact press model and instant temperature field model of transmission between steel worm and plastic helical gear. Compared with plastic gear messing maximum stress on 100°C and normal temperature by means of finite element analysis, discover the maximum stress of plastic gear changes little and deformation of meshing gear tooth surface increase slightly. The fruit of thermal performance research of plastic helical gear and steel worm transmission enrich and improve the research in this field and could offer the experience for the future researches.
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