FIELD: mechanical engineering. SUBSTANCE: first and forth driving gears are mounted on the first and second driven axles. Second driving gear is mounted on the first axle through the coupling, limiting torque and providing free rotation of the gear. Third driving gear is mounted in the second axle by means of an unidirectional driving device. Rotation movement may be transmitted from the axle to the second axle through the first and third gears and through the second and forth gears in the direction of forward and back rotation. EFFECT: improved design. 8 cl, 7 dwg
