Electromechanical transmission for tractors and road-building machinery

Abstract

The article considers variants of kinematic schemes of two-stream transmissions for agricultural tractors and road construction machines. The possibility of using an electromechanical transmission as part of this transmission is considered. The prospect of improving the operational properties of this technique by modernizing the power plant and transmission with the maximum use of serial units in its composition, primarily gearboxes, is analyzed. In this case, the possibility of using a serial transmission in combination with a more powerful engine in a tractor’s transmission is considered. For this purpose, the concept of a dual-line transmission is proposed, where part of the engine power is transmitted bypassing (in parallel) the gearbox. Several possible kinematic schemes of this transmission are considered. A comparative analysis of design options is carried out, where the parallel transmission branch is hydromechanical, mechanical, electromechanical. As a result of the analysis, the concept of a two-stream transmission with electromechanical transmission in a parallel flow is proposed as a promising option for an agricultural tractor. The order and calculated dependencies for determining the main parameters and characteristics of transmission elements of this type are given. The possibility of using the proposed transmission is considered for a promising agricultural 6-8 class wheeled tractor. At the same time, the kinematics of this transmission were analyzed, the gear ratios were calculated, and the characteristics of its main elements were determined. The directions of development of such structures are formulated.