FIELD: mining.
SUBSTANCE: impact piston for the rock drilling machine, containing the control cylinder, the distributor and the working medium under the pressure, includes the control edge, adapted to provide changes of the distributor position in the direction parallel to the axial direction of the impact piston, when the impact piston moves in the impact direction relatively to the control cylinder. The control edge of the impact piston contains at least one recess, provided on the outer periphery of the control edge and configured to provide the start of changing the distributor state, before the control edge of the impact piston will pass the corresponding control edge, provided on the distributor or the control cylinder.
EFFECT: weathering reduction at the working space.
14 cl, 8 dwg
