PERCUSSION HYDRAULIC DEVICE Russian patent published in 1995 - IPC

FIELD: hydraulic equipment. SUBSTANCE: housing has channels for communication with delivery and drain lines. They are hydraulically joined with main channels and are located about annular distribution channel of percussion piston which is formed by central surface of piston proper and surfaces of slide-valve bush and housing facing the former. Reset and acceleration chamber is arranged with axial offset towards percussion piston rod relative to slide-valve bush control chamber. Bush has three annular drillings on its outer surface. Rows of radial holes are arranged in extreme annular drillings; percussion piston chamber is made as three hydraulically isolated sections arranged in tandem for communication with housing channels. Channels, rows of holes, and annular drillings, hydraulically isolated sections of percussion piston chamber are relatively located for periodic communication with delivery and drain lines of reset and acceleration chambers of percussion piston and bush control chamber. EFFECT: improved design. 4 cl, 1 dwg