A work machine includes: a motor; an output shaft, rotated by driving of the motor; a first fan, fixed to and rotating integrally with the output shaft; a second fan, located on one side of the first fan in an axial direction of the output shaft, fixed to and rotating integrally with the output shaft; and a rectification member, accommodating the first and second fans, and, when the output shaft rotates to one side in a rotation direction, causing a first airflow blown out from the first fan and a second airflow blown out from the second fan to join together and flow out toward one side in the axial direction. The rectification member includes a rectification section in which the second airflow is rectified to flow to the one side in the axial direction and is prevented from flowing to the other side in the axial direction.

A self-suction dust collection attachment including a dust collection motor and a fan can be mechanically coupled and electrically connected to multiple types of power tools. A dust collection attachment attachable to a first power tool includes a casing, a suction portion, a dust collector that captures dust sucked through the suction portion, a fan that generates a suction force in the suction portion, a dust collection motor that rotates the fan, and an adapter attachable to at least a second power tool and detachably attachable to the casing. The adapter includes a mechanical coupler that couples the casing and the second power tool and an electrical connector that electrically connects the dust collection attachment and the second power tool when the dust collection attachment is coupled to the second power tool.

An electropneumatic impact mechanism for an electric hand-held power tool, in particular a hammer drill and/or chipping hammer, wherein the impact mechanism has a transmission housing, a guide tube arranged at least partially in the transmission housing, an exciter piston that is movable in the guide tube, a connecting rod coupled to the exciter piston, and an eccentric wheel which is designed as an externally toothed gearwheel and is coupled to the connecting rod on one side and is mounted so as to be rotatable with respect to the transmission housing about an axis of rotation on the other side, an axial gap, preferably for optionally receiving at least part of a lubrication space separating element, is provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel.

A power tool having a hammer mechanism, including: a connecting part connectable with a dust collector, and with a connection flow path to suck in the air from the dust collector to generate a suction power in the dust collector; a motor with a rotating shaft; a first fan to rotate with the rotating shaft and generate a first air flow to cool down the motor; a second fan to rotate with the first fan and generate a second air flow to generate the suction power; a housing with a first exhaust port to discharge the first air flow and a second exhaust port to discharge the second air flow; a first exhaust flow path to guide the first air flow to the first exhaust port; and a second exhaust flow path separated from the first exhaust flow path to guide the second air flow to the second exhaust port.

A power tool having a hammer mechanism, including: a connecting part connectable with a dust collector, and with a connection flow path to suck in the air from the dust collector to generate a suction power in the dust collector; a motor with a rotating shaft; a first fan to rotate with the rotating shaft and generate a first air flow to cool down the motor; a second fan to rotate with the first fan and generate a second air flow to generate the suction power; a housing with a first exhaust port to discharge the first air flow and a second exhaust port to discharge the second air flow; a first exhaust flow path to guide the first air flow to the first exhaust port; and a second exhaust flow path separated from the first exhaust flow path to guide the second air flow to the second exhaust port.

A work machine includes: a motor; an output shaft, rotated by driving of the motor; a first fan, fixed to and rotating integrally with the output shaft; a second fan, located on one side of the first fan in an axial direction of the output shaft, fixed to and rotating integrally with the output shaft; and a rectification member, accommodating the first and second fans, and, when the output shaft rotates to one side in a rotation direction, causing a first airflow blown out from the first fan and a second airflow blown out from the second fan to join together and flow out toward one side in the axial direction. The rectification member includes a rectification section in which the second airflow is rectified to flow to the one side in the axial direction and is prevented from flowing to the other side in the axial direction.