The paper considers the problem of calculation of thermal characteristics for transmissions with intermediate rolling bodies, as well as the selection of lubricants and the rational design of the speed reducer, taking into consideration the heat transfer in the transmission. The results of a theoretical study of friction losses between parts of a composite roller and the main elements of the transmission with intermediate rolling bodies are given. The heat balance equation and formulas allowing

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... us to determine the power rating on the output shaft of the transmission and the average temperature of the speed reducer casing are obtained. The adequacy of the obtained equations is confirmed experimentally on the bench for testing and determining the efficiency of the speed reducer. The thermal analysis of the transmission with intermediate rolling bodies by the finite element method allows us to determine the appropriate type of lubricant and the design of the speed reducer. The paper provides some recommendations for the calculation of the geometrical parameters of the output shaft and the use of transmissions with intermediate rolling bodies which can help prevent overheating and improper transmission operation.