HYDRAULIC UNIT OF IMPACT ACTION Russian patent published in 2016 - IPC E21C37/06 B25D9/00 

FIELD: machine building.

SUBSTANCE: unit contains a casing, in which centring and sealing bushings, a sleeve and a piston-peen are installed, they create in the casing a working and idle run chamber, as well as HP and LP hydraulic accumulators. The working run chamber is periodically connected via a sliding spool valve with the discharge main line or with a LP hydraulic accumulator that in its turn is connected with the drain main line. The idle run chamber is permanently connected with a HP hydraulic accumulator and with the discharge main line. On the peen piston a compression ring is installed. Between the centring and sealing bushings drain chambers and channels are made. In the sleeve wall a start channel is made, it via the valve connects the working run chamber with the discharge main line. Hydraulic resistance and probability of liquid leaks between the chambers are reduced.

EFFECT: ensured start of the unit at any position of the piston-peen.

2 cl, 1 dwg