Abstract: In order to solve the problem of short service life of the reducer due to inaccurate thermal analysis, taking a certain type of SEW( Süddeutschen Elekromotoren-Werke) reducer as the research object, using the Unity3D virtual simulation engine, the thermal power calculation software of the reducer is developed. A virtual simulation method of the temperature field based on the Unity3D example system is proposed. The basic formula of temperature and color expression is derived, and the virtual simulation cloud diagram of cooling water temperature and the change curve of heat transfer power are obtained. Practice has proved that the virtual simulation method can quickly determine whether the cooling method selected for the reducer is reasonable. The virtual simulation technology also provides a new design idea for the thermal analysis of the reducer. It is more convenient and quicker than traditional theoretical calculation or finite element simulation, and has certain engineering application prospects. 

Key words: reducer, thermal power, temperature field, virtual simulation, Unity3D