FIELD: transport engineering: trucks, tractors, road-building machinery. SUBSTANCE: unreliable five-position shifter sleeves are excluded from gearbox. Gear-shifting is provided by simple and reliable two-and three-position shifter sleeves. Design of shafts at planetary mechanism input is simplified: only one tubular shaft is left. There is no tubular shaft of mainshaft. EFFECT: enhanced performance characteristics of vehicle owing to enhanced reliability of gearbox. 2 dwg, 2 tbl
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