FIELD: tractor engineering. SUBSTANCE: input and output shafts have gears providing mechanical and hydraulic couplings with gears of housing. Housing installed for movement has motion mechanism. Hydromechanical torque converter of power transmission is made up of synchronously controlled pairs of gears. Hydromechanical transmission conveys main flow of energy without double conversion. Change of speed and load torque is provided by hydraulic flows and by operation of gears as pump, motor and coupling. Relative rotation of gears and shafts in housing which rotates and travels relative to input and output shafts provides control of output speed. EFFECT: enhanced reliability of operation. 4 dwg
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