A piston guiding element, rock drilling machine and method for supporting a front end portion of a percussion piston of a rock drilling machine. The piston guiding element includes a braking recess at its rear end. The element further includes at least one bearing sleeve, which is provided with two axially successive slide bearing sections. Hydraulic fluid is conveyed between the slide bearing sections via a feed system.

An attachment includes a body, an impact portion defining an impact axis and configured to receive repeated impacts from the powered hammer, and a driving portion including a side load driving portion and a top load driving portion that alternately receive the rod to transmit driving forces from the repeated impacts to the rod. The side load driving portion defines a side load driving axis that is offset from the impact axis. The top load driving portion includes a blind bore and defines a top load driving axis that is coaxial with the impact axis. The top load driving portion includes a sleeve disposed within the blind bore and configured to decrease wear of the blind bore during use.

A hand-held power tool, in particular a demolition hammer, with an impact mechanism assembly includes an electric motor, an eccentric assembly, and an impact pin oscillating linearly along an impact mechanism axis. The eccentric assembly includes an eccentric wheel mounted in an impact mechanism carrier of the impact mechanism assembly, an eccentric wheel rotating about an eccentric axis, and a connecting rod driven by the eccentric wheel. The electric motor has a motor shaft along a motor axis which drives the impact piston by way of the eccentric wheel and the connecting rod. The eccentric wheel has an eccentric hub formed on one side, which is mounted along the eccentric axis on a side of the eccentric wheel facing away from the connecting rod proximally with a floating bearing and distally with a fixed bearing in the impact mechanism carrier.

An axial bearing for reducing wear is provided in an overload clutch for arrangement between a drive unit and a power take-off unit of a hand-held power tool in order to enable decoupling of the drive unit from the power take-off unit in the hand-held power tool when a limit torque is exceeded.

An attachment includes a drive shank that is removably couplable to a tool, the drive shank having a groove in which the retention feature is disposed. An insert is coupled to the drive shank, and the insert is positioned in the groove of the drive shank and configured to engage a retention feature of the attachment.

A striking mechanism (15) having an idle-strike damping element and a rebound-strike damping element (6, 7), which interact with a tool holder (3), wherein the tool holder (3) is mounted via at least two plain bearings (13a, 13b) to a guide housing (5), and wherein the idle-strike damping element and the rebound-strike damping element (6, 7) are arranged at an axial distance relative to one another on the outer circumferential side of the tool holder (3). It is provided that the idle-strike damping element (6) and/or the rebound-strike damping element (7) is coupled to the tool holder (3) via a front-side or inner circumferential toothing (8) and the same damping element (6 or 7) is coupled to the guide housing (5) via a front-side or outer circumferential toothing (11). A power tool (2), in particular a drill or chisel hammer, having a striking mechanism (15).