Hydraulic hammer

摘要

The invention relates to a hydraulic hammer comprising a percussion piston (12) for delivering strokes to a tool (8). The lower part of the percussion piston is sealed to the frame (9) by means of a sealing bushing (31) comprising one or more lower seals (15). The sealing bushing does not contribute to the bearing of the percussion piston and it is arranged in place through the lower end of the hydraulic hammer (1). Further, the invention relates to a tool bushing (28) into which the sealing bushing (31) is integrated.