Study Of Efficiency And Influencing Factors Of Metal Belt CVT

Based on CVT (Continuous Variable Transmission) project of Dongan company, the research is done both in academic study and testing aspects. The development of the project has come to a significative stage periodically. Thefocus on the paper is about efficiency of CVT-one of the key factors ofCVT that must be considered during research process.The basic theory, drive characteristic, kinematics and lubrication conditions etc. of CVT are discussed in this paper. And two points associated with the efficiency are treated in details, one is the clamping force control of secondary pulley, the other is slip control of primary pulley. The power/efficiency losses from metal V-belt during transmission process are studied together with clutch system, torque convertor, transmission oil and control strategies.The major reasons of efficiency loss are pointed out, and some control measures related with the development process are given.Simulation and calculation by AVL CRUISE software are Synchronously carried out. Combining the consumption of the CVT vehicle with the efficiency of CVT transmission, the validity of all the theoretical studies are proved. A CVT vehicle are tested on the dynameter for its fuel consumption. Comparing with mechnical transmission, the data attained on the testing rig verify the validity of simulation and theoretical analysis.To improve the efficiency of CVT, various keys such as transmission intensity, lubrication, machinery and costs should be synthetically considered and optimized. The paper is showing an epitome of CVT transmission technology study. Combining with the CVT project of Dongan company, it is very significat for the further pre-research and external cooperation.