HYDRAULIC IMPACT MECHANISM Russian patent published in 2023 - IPC E21B1/24 E21B1/38 B25D9/04 E21C37/24 

FIELD: hydraulic impact mechanisms.

SUBSTANCE: invention can be used in machines for the development of rocks and frozen soils in the mining and construction industries. The hydraulic percussion mechanism is comprised of a housing, an energy accumulator, a cocking chamber, a striker with a piston and a stepped valve. The stepped valve is made with an end cavity, made with the possibility of the striker piston entering it. The stepped valve forms an overflow chamber with the body. The overflow chamber periodically communicates with the drain line and constantly communicates with the end cavity of the valve. In order to simplify the design of the mechanism, reduce the complexity of its manufacture and the pressure pulsation of the working fluid in the pressure line, the value of the entry of the piston of the striker into the end cavity of the valve is determined by the formula X = V*N/G (cm), where X is the value of the entry of the piston of the striker into the end cavity valve (cm); N is the amount of overlap of the drain line with the outer surface of the valve to provide the necessary impact energy (cm); V is the cross-sectional area of the overflow chamber (cm²); G is the end area of the piston of the striker (cm²).

EFFECT: reduction of pressure pulsation of the working fluid in the pressure line, simplification of the design and reduction of labor intensity of manufacturing.

1 cl, 1 dwg