The Research And Optimal Design Of Crank-Rocker Type Continuously Variable Transmission

With the development of the modern industry, continuously variable transmission (Abbr. CVT), as a generally-used transmission pattern, has been developed in many fields, such as textile industry, light industry, food industry, packing industry and machine tool quickly and widely. Generally, according to transmission medium, CVT is classified as mechanical type, hydraulic type, and electric type. For many strong points, Mechanical CVT has more and more developed gradually domestically and abroad. It is mainly composed of friction type, chain type, belt type, impulse type.Crank-rocker type CVT is a new impulse CVT. It is improved from GUSA type impulse CVT. In this dissertation, kinematic and dynamic analysis of this mechanism has been done. Its dimensional parameters have also been optimized. By using SIMULINK toolbox in MATLAB, the kinematic simulation model and dynamic simulation model can be established, considering acceleration vector loop equations and homogeneous linear equations about force and torque of each component, and then the kinematic and dynamic characteristics of the mechanism can be easily discussed. As a new method for mechanism analysis, it is important for precision, conveniency, flexibility and quickness of design on mechanical transmission.After the optimization to the dimensional parameters of the crank-rocker CVT, the biggest pressure angle, pulsation ratio of angular velocity, abrupt change of angular acceleration of output swing link are all reduced largely. Therefore the mechanism after optimization can run more stably, with less impact to bearings and higher machine efficiency.