Abstract: Provided is a working machine in which a counterweight is appropriately supported, thereby avoiding deterioration of workability. The working machine includes: a motor; a plunger reciprocated in a front-back direction by a drive of the motor; a crankshaft rotated around an axis extending in an up-down direction by the drive of the motor; a counterweight driven in a front-back direction by rotation of the crankshaft so as to cancel out vibration due to the reciprocation of the plunger; a transmission mechanism (gear, crankshaft, and connector) converting a rotation driving force of the motor into a driving force for the plunger and counterweight and transmitting the driving force to the plunger and counterweight; and a gear case (transmission mechanism accommodation portion and lid portion) accommodating the transmission mechanism and elastically supporting the counterweight in the right-left direction.

Abstract: A work machine includes: a motor; a plunger that is reciprocated in the front-back direction by the drive of the motor; a transmission mechanism that converts a rotational driving force of the motor into a reciprocating driving force and transmits the reciprocating driving force to the plunger; a first support that supports the plunger to be capable of reciprocating and is disposed on one side of the plunger in an orthogonal direction orthogonal to the front-back direction; a second support that supports the plunger to be capable of reciprocating and is disposed on the other side of the plunger; and a support member that supports at least one of the first support and the second support such that the distance between the first support and the second support in the orthogonal direction can be changed.

Abstract: A working tool and a drilling method capable of improving workability are provided. A working tool includes a motor, a trigger switch to instruct the driving of the motor, and a microcontroller to control the driving of the motor. The microcontroller stops the motor without transitioning to a retry mode when detecting a rapid increase of a motor current. The microcontroller transitions to the retry mode when detecting an overload without accompanying the rapid increase of the motor current. In the retry mode, the activation and stop of the motor are repeated. When the load applied to a tool bit is eliminated during execution of the retry mode, the microcontroller returns to a normal mode while the trigger switch is kept on.

Abstract: A work machine includes: a motor; a drive mechanism, connected to the motor and operating a tip tool; and a case, accommodating the drive mechanism. The drive mechanism includes: a first drive member, rotationally driven about an axis by the motor; a second drive member, reciprocally driven by the motor; and a support member, fixed to the case, restricting movement of the first drive member in a direction of the axis, and supporting the second drive member so that the second drive member is reciprocally drivable.

Abstract: Provided is a working machine in which a counterweight is appropriately supported, thereby avoiding deterioration of workability. The working machine includes: a motor; a plunger reciprocated in a front-back direction by a drive of the motor; a crankshaft rotated around an axis extending in an up-down direction by the drive of the motor; a counterweight driven in a front-back direction by rotation of the crankshaft so as to cancel out vibration due to the reciprocation of the plunger; a transmission mechanism (gear, crankshaft, and connector) converting a rotation driving force of the motor into a driving force for the plunger and counterweight and transmitting the driving force to the plunger and counterweight; and a gear case (transmission mechanism accommodation portion and lid portion) accommodating the transmission mechanism and elastically supporting the counterweight in the right-left direction.

Abstract: A working tool and a drilling method capable of improving workability are provided. A working tool includes a motor, a trigger switch to instruct the driving of the motor, and a microcontroller to control the driving of the motor. The microcontroller stops the motor without transitioning to a retry mode when detecting a rapid increase of a motor current. The microcontroller transitions to the retry mode when detecting an overload without accompanying the rapid increase of the motor current. In the retry mode, the activation and stop of the motor are repeated. When the load applied to a tool bit is eliminated during execution of the retry mode, the microcontroller returns to a normal mode while the trigger switch is kept on.

Abstract: A power tool includes a prime mover, an output shaft that extends along a first direction and retains a tip tool and is driven by the prime mover, a support member that supports the output shaft to be drivable, a gear that rotates around an axis extending in a second direction crossing the first direction and transmits a power of the prime mover to the output shaft, and a gear cover that accommodates the gear and the support member. Inside the gear cover, a lubricant retention portion capable of retaining a lubricant is arranged at a side of the support member, and the lubricant retention portion is partitioned from a gear accommodation portion that accommodates a gear by a wall extending in a direction intersecting an extending direction of the output shaft in the gear cover.

Abstract: Provided is a work machine. The work machine has a brushless motor, and the brushless motor has a plurality of teeth. A stator coil is wound around each of the teeth. An end portion of each stator coil is connected to a circuit board. The circuit board has: a first conductor pattern connecting the stator coils wound around adjacent teeth; and a second conductor pattern and a third conductor pattern each connecting the stator coils wound around the non-adjacent teeth. The plurality of stator coils are in the form of delta connection parallel winding.

Abstract: There is provided a power tool including a housing, a brushless motor, a power supply circuit, and a fan. The housing is formed with an inlet hole and an exhaust hole. The brushless motor is supported by the housing. The power supply circuit includes at least one circuit element for supplying electric power of a power source to the brushless motor. The fan is driven by rotation of the brushless motor to generate a cooling air flow that flows from the inlet hole to the exhaust hole in the housing. The housing includes a first housing including a grip portion and supporting the brushless motor. The inlet hole is formed in the first housing. The at least one circuit element is disposed inside the first housing and is cooled by the cooling air flow.

Abstract: A front grease retention unit is provided under a front plunger and a wall is provided between the retention unit and a gear accommodation unit. Furthermore, a front grease receiving member is provided under the front plunger and a front metal bearing, and grease falling into the front grease receiving member is sent toward the outer circumferential face of the front plunger. The grease is pushed out by using the vertical oscillation of a front metal anchor bolt in orbital mode. A rear grease receiving member is provided under a rear plunger and a rear metal bearing, and grease falling into the rear grease receiving member is sent toward the outer circumferential face of the rear plunger. The grease in a grease reservoir groove is pushed out by using the vertical oscillation of a rear metal anchor bolt in orbital mode.

Abstract: There is provided a power tool including a housing, a brushless motor, a power supply circuit, and a fan. The housing is formed with an inlet hole and an exhaust hole. The brushless motor is supported by the housing. The power supply circuit includes at least one circuit element for supplying electric power of a power source to the brushless motor. The fan is driven by rotation of the brushless motor to generate a cooling air flow that flows from the inlet hole to the exhaust hole in the housing. The housing includes a first housing including a grip portion and supporting the brushless motor. The inlet hole is formed in the first housing. The at least one circuit element is disposed inside the first housing and is cooled by the cooling air flow.

Abstract: A powered working machine (10) with which the transmission of vibrations from a housing to a control substrate can be suppressed, operates a distal tool using power from a brushless motor (30), is configured to have: a control substrate (71) that controls the brushless motor (30); a substrate case (82) that accommodates the control substrate (71); a motor housing (20) and cover (160) that support the substrate case (82); an elastic body (152) that is disposed between the substrate case (82) and the motor housing (20); and an elastic body (153) that is disposed between the substrate case (82) and the cover (160).