Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.

Abstract: An impact rotary tool includes a hammer and an anvil that transmits rotational impact force from the hammer to a tip tool. The anvil includes a first member and a second member. The first member holds the tip tool thereon. The first member is fitted into the second member. The rotational impact force is applied to the second member. The first member and the second member are arranged to be fitted into each other in a fitting portion. The fitting portion has a tolerating mechanism. The tolerating mechanism tolerates misalignment of a first rotational axis with a second rotational axis. The first rotational axis is a rotational axis of the first member. The second rotational axis is a rotational axis of the second member.

Abstract: An impact rotary tool includes a hammer, an anvil, an output shaft, a housing, and a bearing (first bearing). The bearing (first bearing) is held by the housing. The anvil includes a first contact portion. The output shaft includes a second contact portion. The second contact portion receives, from the first contact portion, force that causes the output shaft to rotate. The bearing (first bearing) is in contact with at least one of the first contact portion or the second contact portion and supports at least one of the output shaft or the anvil rotatably.

Abstract: An impact rotary tool includes a hammer, an anvil, an output shaft, a housing, a bearing (first bearing), and a buffer member. The buffer member includes an elastic member. The anvil has a first facing region. The output shaft has a second facing region. The buffer member is interposed between the anvil and the output shaft. The buffer member regulates a gap distance between the second facing region and the first facing region such that when a maximum load is transmitted from the hammer to the elastic member, the second facing region faces the first facing region with a gap left between the second facing region and the first facing region in a thrusting direction.

Abstract: An impact rotary tool includes a drive source, an impact force generator, an output shaft, a torque measuring unit, and a torque calculator. The impact force generator is configured to generate impact force in pulse form from power of the drive source. The output shaft is configured to transmit the impact force to a tip tool. The torque measuring unit is configured to measure a torque applied to the output shaft. The torque calculator is configured to, when a torque waveform of the torque measured by the torque measuring unit during one impact includes a plurality of peak values, calculates the tightening torque in accordance with a largest peak value of one or more second or subsequent peak values.

Abstract: An electric power tool includes: an output shaft on which a front-end tool is adapted to be mounted; and a power transmission mechanism that transmits a rotational output of a motor to the output shaft. A posture information acquisition unit acquires posture information for identifying a posture of the electric power tool. A torque information acquisition unit acquires torque information indicating a measured value of tightening torque produced by the front-end tool. A transmission unit transmits the posture information, the torque information, and time information related to a time when respective information is acquired to an external apparatus.

Abstract: An impact rotary tool includes a hammer and an anvil that transmits rotational impact force from the hammer to a tip tool. The anvil includes a first member and a second member. The first member holds the tip tool thereon. The first member is fitted into the second member. The rotational impact force is applied to the second member. The first member and the second member are arranged to be fitted into each other in a fitting portion. The fitting portion has a tolerating mechanism. The tolerating mechanism tolerates misalignment of a first rotational axis with a second rotational axis. The first rotational axis is a rotational axis of the first member. The second rotational axis is a rotational axis of the second member.

Abstract: A torque transmission mechanism transmits a torque produced by a rotation of a driving shaft to an output shaft. A clutch mechanism is provided between a motor and the torque transmission mechanism. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to the driving shaft side and a driven magnet member coupled to the output shaft side. The driving magnet member and the driven magnet member are arranged such that magnetic surfaces on each of which S-pole magnets and N-pole magnets are alternately arranged face other. The clutch mechanism transmits the torque produced by the rotation of the driving shaft to the driving magnet member but does not transmit a torque the driving magnet member receives from the driven magnet member to the driving shaft.

Abstract: An impact tool includes a motor, a hammer, and an anvil. The hammer is configured to be rotated around a rotation axis by motive power provided from the motor. The anvil is configured to be rotated around the rotation axis by receiving striking force from the hammer in a circumferential direction of the rotation axis. In the impact tool, moment of inertia of the hammer around the rotation axis is 10 or more times moment of inertia of the anvil around the rotation axis.

Abstract: A motor retainer is provided on an inner circumferential surface of a housing and retains an outer circumference of a motor unit. A rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. A sensor substrate retainer is provided on the inner circumferential surface of the housing and retains the position detector at a position facing the rotating body.

Abstract: An electric power tool includes: a motor unit including a motor; a driving block for transmitting a rotational output of the motor to a front-end tool; and a rotation detector that detects an angle of rotation of the motor. The rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. The rotating body includes an opening, and the motor shaft is press fitted and fixed to the opening of the rotating body.

Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.

Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.

Abstract: An electric power tool includes: a motor; an output shaft; and a power transmission mechanism that transmits a rotational output of the motor to the output shaft. A motor control unit controls rotation of the motor in accordance with an on operation of the user operation switch performed by a user. A detector detects physical quantity data while the motor is being rotated. A status determination unit determines whether the electric power tool is in a deteriorated status, by using the physical quantity data. A notification interface communicates that the electric power tool is in a deteriorated status while the motor is not being rotated.

Abstract: In an electric power tool, an acquisition unit acquires physical quantity data detected while a motor is being rotated. A storage unit stores the physical quantity data and time information related to time when the physical quantity data is acquired, mapping the physical quantity data and the time information to each other. A transmission unit transmits the physical quantity data and the time information to a server system. The server system includes: a server-side reception unit that receives the physical quantity data and the time information transmitted; and a status evaluation unit that evaluates a level of a status of the electric power tool by using the physical quantity data and the time information.

Abstract: An electric power tool includes: an output shaft on which a front-end tool is adapted to be mounted; and a power transmission mechanism that transmits a rotational output of a motor to the output shaft. A posture information acquisition unit acquires posture information for identifying a posture of the electric power tool. A torque information acquisition unit acquires torque information indicating a measured value of tightening torque produced by the front-end tool. A transmission unit transmits the posture information, the torque information, and time information related to a time when respective information is acquired to an external apparatus.

Abstract: An impact rotary tool includes: a driver, a spindle, an anvil disposed in front of the spindle in a rotation axis direction, a main hammer applying a rotation force to the anvil, and a sub-hammer applying, to the main hammer having applied the rotation force to the anvil, a rotation force in the same direction.

Abstract: A torque transmission mechanism transmits a torque produced by a rotation of a driving shaft to an output shaft. A clutch mechanism is provided between a motor and the torque transmission mechanism. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to the driving shaft side and a driven magnet member coupled to the output shaft side. The driving magnet member and the driven magnet member are arranged such that magnetic surfaces on each of which S-pole magnets and N-pole magnets are alternately arranged face other. The clutch mechanism transmits the torque produced by the rotation of the driving shaft to the driving magnet member but does not transmit a torque the driving magnet member receives from the driven magnet member to the driving shaft.

Abstract: A motor retainer is provided on an inner circumferential surface of a housing and retains an outer circumference of a motor unit. A rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. A sensor substrate retainer is provided on the inner circumferential surface of the housing and retains the position detector at a position facing the rotating body.

Abstract: An electric power tool includes: a motor unit including a motor; a driving block for transmitting a rotational output of the motor to a front-end tool; and a rotation detector that detects an angle of rotation of the motor. The rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. The rotating body includes an opening, and the motor shaft is press fitted and fixed to the opening of the rotating body.