FIELD: machine building.
SUBSTANCE: invention relates to a hydraulic drive system. Hydraulic assistance system comprises driving hydraulic device (1) having retractable radial pistons, driven hydraulic device (2) having retractable radial pistons and primary motor (M). Discharge (12) of driving hydraulic device (1) is connected to admission (21) of driven hydraulic device (2) by supply line (4). Discharge (22) of driven hydraulic device (2) is connected to admission (11) of driving hydraulic device (1) by return line (5). System also comprises charging source (3) suitable for being selectively engaged, said charging source being connected to admission line (4) and to discharge line (5) via a charging line, and selectively either to tank (R), or only to admission (11) of driving hydraulic device (1), via an engagement line provided with control (7).
EFFECT: increase in the life of the device is achieved.
11 cl, 4 dwg
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