FIELD: mechanical engineering; reversible gear mechanisms of varying ratio. SUBSTANCE: main and additional bevel gear trains are four-link trains whose center wheels are fitted on main and additional drive shafts through main and additional overrunning clutches, respectively. Main overrunning clutches have opposite direction of wedging. Additional overrunning clutches are made similarly. Additional drive shafts is coaxially relative to main drive shaft. Additional drive shaft holds drive gear. Controllable clutches are fitted on main and additional drive shafts. Additional driven shafts are mounted in pairs coaxially relative to each other. Such construction makes it possible to increase number of controllable kinematic chains and to perform shift from one-engine drive to two-engine drive and vice versa. EFFECT: enhanced operational efficiency and reliability. 1 dwg
