A portable power tool has an exciter piston guided along a movement axis in a guide tube and a striker coupled to the exciter piston. A connecting rod is fastened to a piston pin in the exciter piston and to an electric motor. A bearing for supporting the piston pin is formed by a piston head of the exciter piston and a closure plate inserted into the exciter piston. A rotary closure is formed by a groove, extending in a direction of rotation about the movement axis, in the piston wall and by a radially protruding fin on the closure plate. A detent for locking the fin counter to the direction of rotation is pivotable in the radial direction between a locking position and a releasing position. The detent is deflected beyond the external dimensions of the piston wall in the radial direction in the releasing position.

A roller bearing for at least one set of roller bodies, which are disposed in an annular manner, the roller bearing having at least one track element with a track, on which the roller bodies are provided for rolling. The track comprises a track base having a circular circumferential The track element comprises, on each axial side of the track base, a shoulder or a rim for the roller bodies, each shoulder or rim having a circular circumferential line. The track element is formed such that, as viewed perpendicular to the planes defined by the circumferential lines, all center points of the three circumferential lines are different from each other.

A hammer drill includes a boss sleeve rotatably and externally mounted to an intermediate shaft separately from the intermediate shaft. The boss sleeve includes a rod coupled to a rear end of a piston cylinder via a swash bearing. The boss sleeve is configured to rotate to convert a rotation of the intermediate shaft into a reciprocating motion in a front-rear direction of the rod and transmit the reciprocating motion to the piston cylinder. The hammer drill includes a second clutch disposed at the intermediate shaft. By performing a switch operation of a slide position of the second clutch, a hammer mode in which the second clutch is engaged with the boss sleeve to reciprocate the piston cylinder back and forth and another operation mode are selectable. The boss sleeve is rotatably cantilevered not to be in contact with the intermediate shaft by an inner housing via a bearing.

The invention relates to a hammering device (10) for influencing the subsurfaces of workpieces (14) comprising a beating tool (16) for acting on the workpiece (14), a beating mechanism (18) which has a beater (20) for producing a beating pulse on the beating tool (16), and a drive (32) for driving the beating mechanism (18), wherein the beating mechanism (18) has at least a second beater (20) for producing a beating pulse on the beating tool (16). According to the invention, it is intended for the beating mechanism (18) to comprise a drive shaft (30) that extends along a drive axis (A) and a wobble ring (28) for transforming a rotational movement of the drive shaft (30) into a translational movement, and the first beater (20.1) and the second beater (20.2) to be driven by the wobble ring (28).

An impact tool includes a tool body, a tool holder, a cylindrical member, a reciprocating member, a motor, a first rotary body, a second rotary body, a swinging member, and clutch mechanisms. The clutch mechanisms are disposed between the first rotary body and the second rotary body on a power transmission path from the motor to the swinging member. The tool holder and the cylindrical member move together as a movable unit with respect to the tool body between a front end position and a separate position, according to a pressing force applied to the tool holder. The clutch mechanisms are each configured to start transmission of the first rotary body to the second rotary body while the movable unit moves from the front end position to the separate position and to interrupt transmission while the movable unit moves from the separate position to the front end position.

Some aspects of the disclosure provide a rotary hammer that is configured to impart impacts to a tool bit. The rotary hammer includes a housing, a motor disposed within the housing, a spindle, and an impact mechanism. The housing includes a first end that can have a handle and a second end that are configured to receive the tool bit. The housing extends along a direct direction between the first and second end. The spindle is disposed within the housing and rotatable by the motor. The spindle defines a spindle axis that is transverse relative to the first direction. The impact mechanism includes a piston and a striker. The piston is at least partially received within the spring for reciprocation therein. The striker is received within the spindle for reciprocation in response to reciprocation of the piston.

A hammer mechanism has a clamping chuck and a snap die provided for the direct striking of an inserted tool. The snap die includes a coupling element for transmitting a rotary motion to the clamping chuck.

A hammer mechanism having at least one impact-generation unit and a clamping chuck drive shaft is provided. The impact-generation unit includes a spur-gear transmission stage for translating a rotational speed of the clamping chuck drive shaft into a higher rotational speed for impact generation.

A hammer drill has a body housing having a motor housing and a gear housing formed in one piece. An electric motor is fixed to the motor housing. A motion converting mechanism, a striking mechanism and a tool holder which form a striking mechanism part are housed in the gear housing so as to be movable with respect to the gear housing. During hammering operation, the striking mechanism part moves with respect to the gear housing under a biasing force of a coil spring, so that vibration caused by the hammering operation is reduced.

A clutch device includes a guiding element, a first clutch element being capable of sliding relative to the guiding element, a second clutch element being capable of sliding relative to the guiding element, an elastic element including a first connecting leg and a second connecting leg which are respectively connected with the first clutch element and the second clutch element, and a rotating element being capable of rotating about a first axis relative to the guiding element. The rotating element includes a first supporting portion for contacting with the first connecting leg, which is disposed at a first axial position of the first axis, and a second supporting portion for contacting with the second connecting leg, which is disposed at a second axial position of the first axis.