Abstract: A new kind of cam rotor vane motor(CRVM) is introduced with its operating principle and features. The seal method of CRVM is clearance seal. Under different clearance and working conditions, the local temperature of CRVM seal is obviously different. In this study, pressure-gradient flow temperature rise theory，the parallel-plate clearance flow model and the parallel-disc clearance radial flow model are used to calculate the temperature increase caused by leakage and friction. And the simulation models of two main heating points are established according to the results: One is between cam and stator; The other is between cam and bulkhead. Through the simulation, the influence of sealing clearance, working pressure and rotating speed on the local temperature rise of the seal is analyzed. Moreover, an experimental platform is established to measure the temperature change of CRVM under working conditions, and the results of the simulating calculation are verified. The results show that when the sealing clearance is not selected properly, the local temperature will rise obviously. From the perspective of preventing local oil overheating and improving the working efficiency of CRVM, the optimization sealing clearance index of CRVM is put forward.

Key words: cam rotor; vane motor; heat property; sealing clearance; local temperature