Optimal Design of Adaptive Toothed Variator (CVT)

Abstract

Object of research is the adaptive gear variator. In present the concept “variator” is used only for frictional mechanisms. In the article it is proved, that the gear mechanism with constant engagement is capable to execute the variator functions. The adaptive toothed variator represents the planetary gear mechanism with constant engagement of cogwheels and with the variable transfer ratio. The variator works without a control system. Basic difference of a gear variator is the mechanism has two degrees of freedom and only one input. Definability of motion provides the planetary four-bar closed contour creating additional power constraint with circulation of energy. The variator is created on the basis of a discovery of professor Ivanov K.S. «Effect of force adaptation in mechanics». The essence of the discovery is a planetary kinematic chain with two degrees of freedom in which cogwheels form the mobile closed contour, adapts for variable loading by an independent regulation of motion speed of cogwheels in a contour under the influence of loading. The basic theoretical regularities of creation of a gear variator, the description of a development type of a variator and the test-bed, technique of conducting of tests and results of tests of the adaptive gear variator which are confirming effect of force adaptation are presented.