REGENERATIVE PNEUMOHYDRAULIC TWO-CHAMBER COUPLING DEVICE OF A TRAIN Russian patent published in 2023 - IPC B60D1/14 B60D1/145 B60D1/155 

FIELD: devices for coupling a trailer with a tractor.

SUBSTANCE: regenerative pneumohydraulic two-chamber coupling device of a road train contains a drawbar, recuperative and damper mechanisms, a cylinder body rigidly fixed in the drawbar, a hydraulic tank, adjustable safety and pressure reducing valves, check valves, flexible, suction and pressure pipelines, channels, pneumohydraulic accumulators, connecting port of the consumer of the recuperated working liquids. A movable cylinder is placed inside the cylinder body. A two-chamber single-acting hydraulic cylinder is placed in the movable cylinder, inside which a fixed partition, a rod and two pistons are placed, dividing the two-chamber single-acting hydraulic cylinder into piston, rod and intermediate cavities. One piston is integral with the rod, and the second piston is rigidly connected to the rod.

EFFECT: increased volume of the recuperated working fluid by the coupling device when a train is braked.

1 cl, 6 dwg