Characteristic Research And Parameter Optimization Of Zero-Max Type CVT

Zero-Max type pulse CVT is a quadrinomial side-by-side connecting rod type infinitely variable speed transmission. It has been widely applied to all kinds of transmission system, because it has many advantages, such as reliable transmission, broad adjustable-speed rang, timing at rest or movement, compact structure and lighter weight, and so on. Due to its particular structure, output speed pulsation coefficient and impact load affect mechanical transmission property. In this dissertation, Zero-Max type pulse CVT has been lucubrated. Analysis of kinematics and dynamics of mechanism and parameter optimization have been done for better transmission property.Firstly, on the basis of analysis of structure characteristic and working principle of Zero-Max type pulse CVT, deduce angular velocity and angular acceleration matrix equation of every component of transmission structure and build mechanical kinematic mathematical model. Kinematic simulation model of locomotor system has been built through SIMULINK toolbox of MATLAB. Obtain kinetic characteristic of this drive mechanism after simulation operation. Analysis of kinetic law indicates that this drive mechanism is a quick return asymmetrical mechanism and has a inverse proportion relation between pulsation coefficient, abrupt change of angular acceleration and output angular velocity.Secondly, deduce force and torque matrix equation of every component by kinetostatics analysis method and build mechanical dynamic mathematical model. Built dynamic simulation model of power system through SIMULINK toolbox of MATLAB. Dynamic characteristic of this drive mechanism has been obtained after simulation operation. Analysis of dynamic characteristics indicates that wave value of every joint constraint reaction is relative bigger. Constraint reaction of output end is obviously bigger than it of input end.Finally, based on confirming design variable, constraint condition and optimization function, use fmincon function of optimization toolbox of MATLAB to optimize dimensional parameter of this mechanism. Therefore the mechanism can run more stably after optimization,with less impact to bearings and higher machine efficiency.