Recently, more and more transport and special vehicles have been equipped with hybrid transmissions. The main aim is to reduce fuel consumption and pollutant emissions. Today, hybrid transmissions are available in many design configurations. This state of affairs leads to the provision of recommendations regarding the structural structure of the hybrid transmission, the dimensions and characteristics of the power control components, which affect the efficiency of the hybrid transmission installation. The objective of this work is to search for the constructive structure of an electromechanical transmission based on the principle of a power flow adder, by analyzing the kinematic and power parameters of the transmission operation, taking into account the peculiarities of the operation of an electric motor and an internal combustion engine. The method used to solve the problem was based on the presentation of the principles of the structure of a continuously variable transmission and the mathematical description of the change in kinematic and force parameters during the operation of a continuously variable transmission. The result of the study is a scientifically based selection of two continuously variable electromechanical transmission schemes based on the principle of an energy flow adder.