Impact piston device for a impact drill drive

An impact piston device for an impact drill drive, comprising

• an impact piston, which is movably mounted in a piston housing so as to be reversible between a front striking position and a rear retracted position, the impact piston having at least one front pressurizing surface and at least one rear pressurizing surface, at least one front pressure chamber and a rear pressure chamber being formed together with the piston housing,
• a hydraulic fluid feed,
• a hydraulic fluid drain,
• a first control device, via which at least the rear pressure chamber for effecting the reversing movement of the impact piston is connected alternately to the hydraulic fluid feed and the hydraulic fluid drain, and
• a second control device, with which at least one stroke path of the impact piston within the piston housing can be adjusted,
• the first control device having an actuatable first control valve and the second control device having an actuatable second control valve,
• wherein
• the first control valve and second control valve are arranged in a common valve housing,
• the valve housing comprises a valve block in which the fluid lines and the valve receptacles are formed, in particular milled in, and
• a cover plate is provided, with which the valve block containing the fluid lines and the valve receptacles is closed.