Patent ID: 8636088

Claim:
A rock drilling machine that comprises: a body, a percussion device that comprises a percussion element for generating stress pulses, a drill shank that is an elongated piece arranged in front of the percussion element in the stroke direction, the drill shank having an impact surface for receiving said stress pulses and, further, the drill shank being movable in the axial direction relative to the body, a flushing chamber located in the front part of the rock drilling machine to feed flushing medium to the drill shank, an axial bearing that comprises at least one pressure medium-operated axial piston which pushes the drill shank in the axial direction relative to the body a predefined travelling length toward the stroke direction (A), whereby the impact surface of the drill shank is settable at a required axial point for receiving stress pulses, and wherein the flushing chamber is located separate from the axial bearing, wherein the axial piston comprises at least one working pressure surface located in at least one working pressure space belonging to the axial bearing, to which the pressure of pressure medium is fed from at least one feed channel, whereby a force in the stroke direction is directable to the axial piston, and the axial bearing comprises at least one axial bearing module that comprises at least one axial piston, at least one seal, at least one bearing surface, and a module frame, said axial bearing module is detachable and installable in place in one piece without dismantling the body of the rock drilling machine, and wherein at least one set of support members is in connection with the axial bearing for transmitting supporting forces caused by the axial bearing to the body of the rock drilling machine without any force effects directed to the flushing chamber.