HYDROPNEUMATIC HAMMER OF PERCUSSION ACTION Russian patent published in 2002 - IPC

FIELD: mining and construction industries; applicable in hydraulically operated machines for working of strong rocks. SUBSTANCE: control valve of control unit of offered device is made with bore in central part, and central and radial holes in control valve are made from side of end face constantly connected with head. Located in control chamber is pusher installed for engagement with blind end of control valve. Control valve and pusher have different diameters. Installed in channel communicating alternately control chamber with resetting and return chambers is regulated throttle. Separation of functions of control valve motion and distribution of flows of working fluid allow prevention of wedging of control valve and disturbance of its functional work, reduction of fluid losses from control chamber and increase of accuracy of regulation of time of operation of control valve. EFFECT: higher efficiency. 1 dwg