TRACK-LAYING VEHICLE TRANSMISSION Russian patent published in 1995 - IPC

FIELD: transport engineering. SUBSTANCE: transmission has housing, engine, stepped gearbox with output central shaft, positive displacement hydraulic transmission kinematically coupled with engine and provided with gear on output shaft, countershaft with two gears installed in bearings in housing parallel to output shafts of stepped gearbox and positive displacement hydraulic transmission, one of gears being rigidly fitted on shaft, three-link planetary final drives with crown gears fitted on output central shaft of stepped gearbox, carriers connected to vehicle track drives and coupled through brake with transmission housing, and sun gears one of which is installed for engagement with gear fitted on countershaft and other, for engagement with idler gear installed in transmission housing in engagement with other gear of countershaft; it has also sliding couplings, pair of gear 5 freely fitted on ends of output shaft of positive displacement hydraulic transmission and countershaft, and gears rigidly fitted on output shaft of positive displacement hydraulic transmission and on countershaft. Sliding couplings are in constant meshing with gears fitted on output shaft of positive displacement hydraulic transmission and on countershaft and are brought into meshing in turn with gears freely fitted on output shaft of positive displacement hydraulic transmission and on countershaft. Transmission has also shaft intended for unloading of positive displacement hydraulic transmission which is kinematically coupled with engine and, through steering friction clutches, with sun gears of final drives. EFFECT: enhanced operation reliability. 2 cl, 2 dwg