Modeling And Simulation Analysis Of New-Type Mechanical Continuously Variable Transmission Based On UG And ADAMS

Continuously variable transmission (Abbr. CVT), a type of transmitting equipment, is designed to achieve continuous output speed in defined ranges in the condition of unvarying input speed to adapt the need of the changing load outside. With the rapid development of industry, especially vehicle industry, increasing requirements are demanded for CVT. Accordingly, the varieties and styles of CVT need to be studied further. Traditionally, continuously variable transmission was achieved mechanically on the dependence of friction. Given the disadvantages of the frictional transmission, traditional transmission was impossible to support high-power transmission. Thus, to explore a type of transmission with non-friction and high-efficiency will be the major direction in the CVT studies.In this study, the development history and types of CVT were described. The related advances and prospects (design tendency) of CVT were also reviewed, and the advantages of gear-driven CVT were emphasized especially. The theories of transmission and speed modulation of the RX planetary cone-shaped CVT were analyzed and a novel mechanical CVT, cone-gear CVT, was designed on the advantages of gear-driven CTV.The transmitting theory of the novel mechanical CVT was analyzed in details and the feasibility of the gear-driven CVT was demonstrated in this study. A modeling strategy was designed and the powerful entity modeling software UG was employed to produce the geometric modeling, to assemble the parts and eventually to generate the devised sample machine. Rationality of the modeling strategy was tested and some parameters were optimized to improve the performance of the sample model. The optimized sample model was imported into software ADAMS to analyze the model structure and perform simulation analysis of the model kinematics and kinetics. The transmitting ratio between driving-wheel and following-wheel were investigated when altering the location of the modulation ring. The ratio ranges were defined at 0.088-0.354 and 2.770-14.000 when the pinion (the smaller wheel) acted as the driving-wheel and following-wheel, respectively. The results showed that gear-driven CVT has the wide features in modulating speed and further verify the model feasibility. The results presented in this study may provide theory basis and experimental data for the design and development of actual sample model in the future.At the end of this paper, the studies were summarized and the potential problems in the design strategy were discussed and the following work was also described or prospected.