FIELD: mining industry, drilling of holes. SUBSTANCE: gear adopted for generation of longitudinal high-frequency oscillations is linked to drilling pipe string. Gear is manufactured in the form of hydraulic double-action cylinder having automatically displaced changing over valves. Piston is coupled with double tubular rod. Piston divides cylinder into two chambers. Fluid medium flows through changing over valves when drilling pipe string enters drilled hole. Piston with rod accomplishes reciprocating motion. This gear is also suitable for alternative usage in the capacity of shock or location tool in drilling pipe string. EFFECT: reduced friction emerging with pushing of drilling pipe string, specifically, twined line into drilled well. 4 cl, 3 dwg
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