FIELD: rocket engineering. SUBSTANCE: hydraulic servo drive includes digital-to-analog converter with rod, power mechanism coupled to shaft and device of backward coupling in the form of roller mounted on rod and cam. It is fitted with fork anchored with one end on rod, forming groove with clearance with two ends embracing shaft with clearance. Distance A from vertex of groove to axis of roller and depth B of groove are determined by expressions specified in description of invention. EFFECT: improved operational characteristics of hydraulic servo drive. 3 dwg
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