Power tool and auxiliary handle

Abstract

To enable an electric power tool to apply reaction force when an auxiliary handle is attached to the electric power tool.SOLUTION: An electric power tool 1A comprises: a motor 8: a housing having a motor housing part that houses the motor; a gear case, arranged in front of the motor housing part, which stores a gear; an output shaft, protruded forward from the gear case, which is rotated by rotation force of the motor with a tip tool mounted thereon; an attachment sensor 70 that detects whether an auxiliary handle is attached or not; and a controller 13 that outputs a control signal to control rotation of the output shaft, on the basis of a detected signal by the attachment sensor.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to a power tool and an auxiliary handle.

Background Art

[0002] When processing an object with a power tool, a tip tool is attached to the output shaft of the power tool. The power tool processes the object by rotating the tip tool. In processing the object, a reaction force may act on the power tool. An operator can receive the reaction force acting on the power tool by holding an auxiliary handle attached to the power tool. Patent Document 1 discloses an example of an auxiliary handle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to apply a reaction force to a power tool when an auxiliary handle is attached to the power tool.

Means for Solving the Problems

[0005] According to the present disclosure, there is provided a power tool including a motor, a housing having a motor housing portion that houses the motor, a gear case that is disposed in front of the motor housing portion and houses a gear, an output shaft that protrudes forward from the gear case and rotates by a rotational force of the motor with a tip tool attached thereto, a mounting sensor that detects whether or not an auxiliary handle is mounted, and a controller that outputs a control signal for controlling the rotation of the output shaft based on a detection signal of the mounting sensor.

Effects of the Invention

[0006] According to the present disclosure, when an auxiliary handle is attached to a power tool, a reaction force can be applied to the power tool.

Brief Description of the Drawings

[0007]

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MODE FOR CARRYING OUT THE INVENTION

[0008] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. Also, some components may not be used.

[0009] In the embodiments, the terms left, right, front, rear, up, and down are used to describe the positional relationship of each part. These terms indicate the relative position or direction based on the center of the power tool.

[0010] In the embodiments, the power tool is a vibration driver drill having a motor. In the embodiments, the direction parallel to the rotation axis AX of the motor is appropriately referred to as the axial direction, the radial direction of the rotation axis AX of the motor is appropriately referred to as the radial direction, and the direction around the rotation axis AX of the motor is appropriately referred to as the circumferential direction or the rotational direction. Also, in the radial direction, the position close to or the direction approaching the rotation axis AX of the motor is appropriately referred to as the inner radial side, and the position far from or the direction separated from the rotation axis AX of the motor is appropriately referred to as the outer radial side. In the embodiments, the axial direction and the front-rear direction coincide.

[0011] [First Embodiment] <Overview of the Power Tool> FIG. 1 is a perspective view showing a power tool 1A according to the present embodiment. As shown in FIG. 1, the power tool 1A includes a housing 2, a rear cover 3, a gear case 5, an output shaft 6, a battery mounting portion 7, a motor 8, a power transmission mechanism 10, a controller 13, a trigger switch 14, a forward / reverse switching lever 15, a speed switching lever 16, a mode change ring 17, a change ring 18, and a light 19.

[0012] The housing 2 is formed of a synthetic resin. The housing 2 has a motor housing portion 2A, a grip portion 2B, and a controller housing portion 2C.

[0013] The motor housing portion 2A houses the motor 8. The motor housing portion 2A is cylindrical. The grip portion 2B is gripped by an operator. The grip portion 2B protrudes downward from the lower part of the motor housing portion 2A. The controller housing portion 2C houses the controller 13. The controller housing portion 2C is disposed at the lower part of the grip portion 2B.

[0014] The rear cover 3 is connected to the rear part of the motor housing portion 2A so as to cover the opening at the rear part of the motor housing portion 2A. The rear cover 3 is made of synthetic resin.

[0015] The motor housing portion 2A has an air intake port 4A. The rear cover 3 has an exhaust port 4B. The exhaust port 4B is provided behind the air intake port 4A. The air intake port 4A connects the internal space and the external space of the housing 2. The exhaust port 4B connects the internal space and the external space of the housing 2. The air intake port 4A is provided at each of the left and right parts of the motor housing portion. The exhaust port 4B is provided at each of the left and right parts of the rear cover 3. The air in the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 4A. The motor 8 is cooled by the air that has flowed into the internal space of the housing 2. The air in the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 4B.

[0016] The gear case 5 houses a power transmission mechanism 10 including a plurality of gears. The gear case 5 is cylindrical. The power transmission mechanism 10 is disposed in the internal space of the gear case 5. The gear case 5 is disposed in front of the motor housing portion 2A. The gear case 5 is formed of a metal such as aluminum.

[0017] The gear case 5 has an engaging portion 9. The engaging portion 9 is provided on the side portion of the surface of the gear case 5. In the present embodiment, the engaging portion 9 includes a left engaging portion 9L provided on the left portion of the gear case 5 and a right engaging portion 9R provided on the right portion of the gear case 5. The left engaging portion 9L has a recess provided on the left portion of the gear case 5. The right engaging portion 9R has a recess provided on the right portion of the gear case 5.

[0018] The output shaft 6 rotates by the rotational force of the motor 8 with the tip tool attached. The output shaft 6 includes a chuck 62 capable of gripping the tip tool. The output shaft 6 protrudes forward from the gear case 5.

[0019] The battery mounting portion 7 is provided below the controller housing portion 2C. The battery 12 is mounted on the battery mounting portion 7. The battery 12 is detachable from the battery mounting portion 7. By being mounted on the battery mounting portion 7, the battery 12 can supply power to the power tool 1A.

[0020] The battery 12 includes a secondary battery. In the present embodiment, the battery 12 includes a rechargeable lithium-ion battery. The battery 12 has a release button 12C. The release button 12C is operated to release the fixation between the battery mounting portion 7 and the battery 12. The release button 12C is provided on the front surface of the battery 12.

[0021] The motor 8 generates a rotational force for rotating the output shaft 6. The motor 8 rotates based on the power supplied from the battery 12. The power transmission mechanism 10 transmits the rotational force generated by the motor 8 to the output shaft 6. The output shaft 6 rotates based on the rotational force transmitted from the motor 8 via the power transmission mechanism 10.

[0022] The controller 13 outputs a control signal for controlling the power tool 1A. The controller 13 is housed in the controller housing portion 2C.

[0023] The trigger switch 14 is provided on the grip portion 2B. The trigger switch 14 includes a trigger member 14A and a switch body 14B. The trigger member 14A protrudes forward from the upper part of the front portion of the grip portion 2B. The trigger member 14A is operated by the operator for the rotation of the motor 8. The operator can operate the trigger member 14A with a finger while holding the grip portion 2B with one of the left and right hands. The trigger member 14A is movable in the front-rear direction. When the trigger member 14A is operated to move rearward, the motor 8 rotates.

[0024] The grip portion 2B has an internal space capable of housing the switch body 14B. The switch body 14B is disposed in the internal space of the grip portion 2B. The switch body 14B outputs a trigger signal when the trigger member 14A is operated. The controller 13 supplies power from the battery 12 to the motor 8 based on the trigger signal output from the switch body 14B. When power is supplied to the motor 8, the motor 8 rotates. When the trigger member 14A is operated, the rotation and stop of the motor 8 are switched.

[0025] The forward / reverse switching lever 15 is provided at the upper part of the side portion of the grip portion 2B. The forward / reverse switching lever 15 is operated by the operator. When the forward / reverse switching lever 15 is operated, the rotation direction of the motor 8 is switched. The operator can operate the forward / reverse switching lever 15 to switch the rotation direction of the motor 8 from one of the forward rotation direction and the reverse rotation direction to the other. When the rotation direction of the motor 8 is switched, the rotation direction of the output shaft 6 is switched.

[0026] The speed change lever 16 is disposed above the motor housing 2A. The speed change lever 16 is operated by an operator to switch the rotational speed of the output shaft 6 between a high speed mode and a low speed mode. The speed change lever 16 is movable in the front-rear direction. When the speed change lever 16 is operated to move forward, the rotational speed of the output shaft 6 is switched to a low speed mode where the speed is the first speed. When the speed change lever 16 is operated to move rearward, the rotational speed of the output shaft 6 is switched to a high speed mode where the speed is a second speed higher than the first speed.

[0027] The mode change ring 17 is disposed in front of the gear case 5. The mode change ring 17 is operated by an operator to switch the working mode of the power tool 1A. The mode change ring 17 is rotatable in the circumferential direction of the rotating shaft AX. When the mode change ring 17 is operated to rotate, the working mode is switched.

[0028] The working modes of the power tool 1A include a vibration mode in which the output shaft 6 vibrates in the front-rear direction and a non-vibration mode in which the output shaft 6 does not vibrate in the front-rear direction. The non-vibration mode includes a clutch mode in which the rotational force transmitted from the motor 8 to the output shaft 6 is blocked when the rotational load acting on the output shaft 6 reaches the release value, and a drill mode in which the rotational force transmitted from the motor 8 to the output shaft 6 is not blocked regardless of the rotational load acting on the output shaft 6. The release value is a value related to the rotational load acting on the output shaft 6. The operator can switch between the vibration mode, the drill mode, and the clutch mode by operating the mode change ring 17.

[0029] The change ring 18 is disposed in front of the mode change ring 17. The change ring 18 is operated by an operator to change the release value in the clutch mode. The change ring 18 is rotatable in the circumferential direction of the rotating shaft AX. When the change ring 18 is operated to rotate, the release value in the clutch mode is changed.

[0030] The light 19 is provided at the upper part of the front portion of the grip portion 2B. The light 19 emits illumination light for illuminating the front of the power tool 1A. The light 19 includes, for example, a light emitting diode (LED).

[0031] <Internal Structure of Power Tool> FIG. 2 is a cross-sectional view showing the power tool 1A according to the present embodiment. As shown in FIG. 2, the power tool 1A includes a motor 8 housed in the motor housing portion 2A, a power transmission mechanism 10 housed in the gear case 5, and an output shaft 6 to which a tip tool is attached.

[0032] The motor 8 generates a rotational force for rotating the output shaft 6. The motor 8 is an inner rotor type brushless motor. The motor 8 has a cylindrical stator 81 and a rotor 82 disposed inside the stator 81. The rotation axis AX of the motor 8 (rotor 82) extends in the front-rear direction.

[0033] The stator 81 includes a stator core 81A including a plurality of laminated steel plates, a front insulator 81B disposed at the front portion of the stator core 81A, a rear insulator 81C disposed at the rear portion of the stator core 81A, a plurality of coils 81D wound around the stator core 81A via the front insulator 81B and the rear insulator 81C, a sensor circuit board 81E attached to the front insulator 81B, and a connection member 81F supported by the front insulator 81B. The sensor circuit board 81E has a plurality of rotation detection elements for detecting the rotation of the rotor 82. The connection member 81F connects the plurality of coils 81D.

[0034] The rotor 82 has a rotor shaft 82A, a cylindrical rotor core 82B disposed around the rotor shaft 82A, and a plurality of permanent magnets 82C held by the rotor core 82B. The rotor shaft 82A and the rotor core 82B are fixed. The front portion of the rotor shaft 82A is rotatably supported by a bearing 83. The rear portion of the rotor shaft 82A is rotatably supported by a bearing 84.

[0035] A centrifugal fan 85 is attached to the rotor shaft 82A. The centrifugal fan 85 is attached to the rotor shaft 82A between the bearing 84 and the stator 81. The exhaust port 4B is arranged in a part around the centrifugal fan 85. When the rotor shaft 82A rotates and the centrifugal fan 85 rotates, the air in the internal space of the motor housing 2A is discharged to the external space of the motor housing 2A through the exhaust port 4B.

[0036] A pinion gear 21S is provided at the front end of the rotor shaft 82A. The rotor shaft 82A is connected to the power transmission mechanism 10 via the pinion gear 21S.

[0037] The gear case 5 includes a first gear case 5A and a second gear case 5B. The second gear case 5B is arranged in front of the first gear case 5A. The engaging portion 9 is provided on the surface of the second gear case 5B.

[0038] The power transmission mechanism 10 transmits the rotational force generated by the motor 8 to the output shaft 6. The power transmission mechanism 10 has a speed reduction mechanism 20, a vibration mechanism 30, and a clutch mechanism 40.

[0039] The speed reduction mechanism 20 reduces the rotation of the rotor shaft 82A and rotates the output shaft 6 at a rotational speed lower than that of the rotor shaft 82A.

[0040] The speed reduction mechanism 20 has a first planetary gear mechanism 21, a second planetary gear mechanism 22, and a third planetary gear mechanism 23. The second planetary gear mechanism 22 is arranged in front of the first planetary gear mechanism 21. The third planetary gear mechanism 23 is arranged in front of the second planetary gear mechanism 22.

[0041] The first planetary gear mechanism 21 has a plurality of planetary gears 21P arranged around the pinion gear 21S, a first carrier 21C that supports the plurality of planetary gears 21P, and an internal gear 21R arranged around the plurality of planetary gears 21P.

[0042] The second planetary gear mechanism 22 includes a sun gear 22S, a plurality of planetary gears 22P arranged around the sun gear 22S, a second carrier 22C that supports the plurality of planetary gears 22P, and an internal gear 22R arranged around the plurality of planetary gears 22P. The sun gear 22S is arranged in front of the first carrier 21C. The diameter of the sun gear 22S is smaller than the diameter of the first carrier 21C. The first carrier 21C and the sun gear 22S are integrated. The first carrier 21C and the sun gear 22S rotate together.

[0043] The third planetary gear mechanism 23 includes a sun gear 23S, a plurality of planetary gears 23P arranged around the sun gear 23S, a third carrier 23C that supports the plurality of planetary gears 23P, and an internal gear 23R arranged around the plurality of planetary gears 23P. The sun gear 23S is arranged in front of the second carrier 22C. The diameter of the sun gear 23S is smaller than the diameter of the second carrier 22C. The second carrier 22C and the sun gear 23S are integrated. The second carrier 22C and the sun gear 23S rotate together.

[0044] The rotation axis AX of the rotor shaft 82A, the rotation axis of the first carrier 21C, the rotation axis of the second carrier 22C, and the rotation axis of the third carrier 23C coincide.

[0045] Further, the speed reduction mechanism 20 includes a speed change ring 24 connected to the speed change lever 16, and a coupling ring 25 arranged in front of the speed change ring 24. The coupling ring 25 is fixed to the inner surface of the first gear case 5A.

[0046] The speed change lever 16 is connected to the internal gear 22R via the speed change ring 24. When the speed change lever 16 is operated to move in the front-rear direction, the internal gear 22R moves in the front-rear direction inside the first gear case 5A. The internal gear 22R can move in the front-rear direction while being engaged with the planetary gears 22P.

[0047] When the speed change lever 16 is operated to move forward, the internal gear 22R moves forward. By moving forward, the internal gear 22R contacts the coupling ring 25. When the internal gear 22R contacts the coupling ring 25, the rotation of the internal gear 22R is restricted.

[0048] When the speed change lever 16 is operated to move backward, the internal gear 22R moves backward. By moving backward, the internal gear 22R moves away from the coupling ring 25. When the internal gear 22R moves away from the coupling ring 25, the rotation of the internal gear 22R is allowed.

[0049] Also, when the internal gear 22R moves forward, it meshes only with the planetary gear 22P. When the internal gear 22R moves backward, it meshes with both the planetary gear 22P and the first carrier 21C.

[0050] When the rotor shaft 82A rotates with the internal gear 22R moved forward, the pinion gear 21S rotates, and the planetary gear 21P revolves around the pinion gear 21S. Due to the revolution of the planetary gear 21P, the first carrier 21C and the sun gear 22S rotate at a rotational speed lower than the rotational speed of the rotor shaft 82A. When the sun gear 22S rotates, the planetary gear 22P revolves around the sun gear 22S. Due to the revolution of the planetary gear 22P, the second carrier 22C and the sun gear 23S rotate at a rotational speed lower than the rotational speed of the first carrier 21C. Thus, when the motor 8 is driven with the internal gear 22R moved forward, both the deceleration function of the first planetary gear mechanism 21 and the deceleration function of the second planetary gear mechanism 22 are exerted, and the second carrier 22C and the sun gear 23S rotate in the low speed mode.

[0051] With the internal gear 22R moved rearward, when the rotor shaft 82A rotates due to the drive of the motor 8, the pinion gear 21S rotates, and the planetary gear 21P revolves around the pinion gear 21S. Due to the revolution of the planetary gear 21P, the first carrier 21C and the sun gear 22S rotate at a rotational speed lower than the rotational speed of the rotor shaft 82A. With the internal gear 22R moved rearward, since the internal gear 22R meshes with both the planetary gear 22P and the first carrier 21C, the internal gear 22R and the first carrier 21C rotate together. Due to the rotation of the internal gear 22R, the planetary gear 22P revolves at a revolution speed the same as the rotational speed of the internal gear 22R. Due to the revolution of the planetary gear 22P, the second carrier 22C and the sun gear 23S rotate at the same rotational speed as the rotational speed of the first carrier 21C. Thus, in the state where the internal gear 22R is moved rearward, when the motor 8 is driven, although the deceleration function of the first planetary gear mechanism 21 is exerted, the deceleration function of the second planetary gear mechanism 22 is not exerted, and the second carrier 22C and the sun gear 23S rotate in the high-speed mode.

[0052] When the second carrier 22C and the sun gear 23S rotate, the planetary gear 23P revolves around the sun gear 23S. Due to the revolution of the planetary gear 23P, the third carrier 23C rotates.

[0053] The output shaft 6 rotates with the tip tool attached. The output shaft 6 has a spindle 61 and a chuck 62 connected to the front portion of the spindle 61.

[0054] The spindle 61 is connected to the third carrier 23C. Due to the rotation of the third carrier 23C, the spindle 61 rotates. The rotation axis of the spindle 61 coincides with the rotation axis AX of the motor 8.

[0055] The spindle 61 is rotatably supported by a bearing 63 and a bearing 64. The spindle 61 is movable in the front-rear direction while being supported by the bearing 63 and the bearing 64.

[0056] The chuck 62 can hold the tip tool. The chuck 62 is connected to the front portion of the spindle 61. When the spindle 61 rotates, the chuck 62 rotates. The chuck 62 rotates while holding the tip tool.

[0057] The vibration mechanism 30 vibrates the output shaft 6 in the front-rear direction. The vibration mechanism 30 includes a first cam 31, a second cam 32, and a vibration switching lever 33.

[0058] The first cam 31 is disposed around the spindle 61. The first cam 31 is fixed to the spindle 61. The first cam 31 rotates together with the spindle 61. Cam teeth are provided on the rear surface of the first cam 31.

[0059] The second cam 32 is disposed behind the first cam 31. The second cam 32 is disposed around the spindle 61. The second cam 32 is rotatable relative to the spindle 61. Cam teeth are provided on the front surface of the second cam 32. The cam teeth on the front surface of the second cam 32 mesh with the cam teeth on the rear surface of the first cam 31. Claws are provided on the rear surface of the second cam 32.

[0060] The vibration switching lever 33 switches between a vibration mode in which the spindle 61 vibrates in the front-rear direction and a non-vibration mode in which the spindle 61 does not vibrate in the front-rear direction. The vibration switching lever 33 is movable in the front-rear direction. When the vibration switching lever 33 moves in the front-rear direction, the vibration mode and the non-vibration mode are switched.

[0061] The mode changing 17 is connected to the vibration switching lever 33. When the mode changing 17 is operated by an operator, the vibration switching lever 33 moves in the front-rear direction. When the mode changing 17 is operated, the vibration mode and the non-vibration mode are switched.

[0062] The vibration mode includes a state in which the rotation of the second cam 32 is restricted. The non-vibration mode includes a state in which the rotation of the second cam 32 is allowed. When the vibration switching lever 33 moves forward, the rotation of the second cam 32 is restricted and it is switched to the vibration mode. When the vibration switching lever 33 moves backward, the rotation of the second cam 32 is allowed and it is switched to the non-vibration mode.

[0063] In the vibration mode, at least a part of the vibration switching lever 33 that has moved forward comes into contact with the second cam 32. When the vibration switching lever 33 and the second cam 32 come into contact, the rotation of the second cam 32 is restricted. When the motor 8 rotates in a state where the rotation of the second cam 32 is restricted, the first cam 31 fixed to the spindle 61 rotates while hitting the cam teeth of the second cam 32. As a result, the spindle 61 rotates while vibrating in the front-rear direction.

[0064] In the non-vibration mode, the vibration switching lever 33 that has moved backward separates from the second cam 32. When the vibration switching lever 33 and the second cam 32 separate, the rotation of the second cam 32 is allowed. When the motor 8 rotates in a state where the rotation of the second cam 32 is allowed, the second cam 32 rotates together with the first cam 31 and the spindle 61. As a result, the spindle 61 rotates without vibrating in the front-rear direction.

[0065] The vibration switching lever 33 is disposed around the first cam 31 and the second cam 32. The vibration switching lever 33 also has an opposing portion 33A that opposes the rear surface of the second cam 32. The opposing portion 33A protrudes radially inward from the rear portion of the vibration switching lever 33.

[0066] A coil spring 34 is disposed behind the vibration switching lever 33. The coil spring 34 generates a biasing force that moves the vibration switching lever 33 forward.

[0067] The mode change ring 17 has an operation ring 17A operated by an operator and a cam ring 17B connected to the operation ring 17A. The cam ring 17B is arranged radially inward of the operation ring 17A. At least a part of the rear surface of the cam ring 17B contacts the front surface of the vibration switching lever 33.

[0068] A recess is provided in a part of the rear surface of the cam ring 17B. When the mode change ring 17 rotates by the operation of the operator with the elastic force of the coil spring 34 applied to the vibration switching lever 33, the front part of the vibration switching lever 33 is switched between a state of being arranged in the recess of the cam ring 17B and a state of not being arranged in the recess. When the front part of the vibration switching lever 33 is arranged in the recess of the cam ring 17B, the vibration switching lever 33 moves forward, and the claw on the rear surface of the second cam 32 and the opposing part 33A of the vibration switching lever 33 come into contact. Thereby, it is switched to a vibration mode in which the rotation of the second cam 32 is restricted. When the front part of the vibration switching lever 33 is not arranged in the recess of the cam ring 17B, the vibration switching lever 33 moves backward, and the claw on the rear surface of the second cam 32 and the opposing part 33A of the vibration switching lever 33 are separated. Thereby, it is switched to a non-vibration mode in which the rotation of the second cam 32 is allowed.

[0069] The clutch mechanism 40 shuts off the rotational force transmitted from the motor 8 to the output shaft 6 when the rotational load acting on the output shaft 6 reaches the release value.

[0070] The clutch mechanism 40 has a spring holder 41, a coil spring 42, a washer 43, a pressing pin (not shown), and a connecting ring 45.

[0071] The spring holder 41 holds the coil spring 42. The spring holder 41 is movable in the front-rear direction. The spring holder 41 has a male screw part that is coupled to a female screw part provided on the change ring 18. When the change ring 18 rotates by the operation of the operator, the spring holder 41 moves in the front-rear direction.

[0072] The coil spring 42 generates a biasing force that moves the internal gear 23R of the third planetary gear mechanism 23 rearward. The rear end portion of the coil spring 42 contacts the washer 43. The coil spring 42 generates a biasing force that moves the internal gear 23R rearward via the washer 43 and the pressing pin.

[0073] The washer 43 is disposed rearward of the coil spring 42. The washer 43 is movable in the front-rear direction. The washer 43 is rotatable. The washer 43 is disposed around the inner cylindrical portion of the second gear case 5B. The washer 43 is movable in the front-rear direction and rotatable around the inner cylindrical portion of the second gear case 5B.

[0074] The pressing pin is disposed rearward of the washer 43. The pressing pin contacts the front surface of the internal gear 23R of the third planetary gear mechanism 23. A clutch cam is provided on the front surface of the internal gear 23R. The pressing pin is engageable with the clutch cam of the internal gear 23R.

[0075] The coil spring 42 generates a biasing force so as to press the pressing pin against the front surface of the internal gear 23R. When the pressing pin is pressed against the internal gear 23R, the clutch cam of the internal gear 23R and the pressing pin engage with each other, and the rotation of the internal gear 23R is restricted. That is, the rotation of the internal gear 23R is restricted by the biasing force of the coil spring 42.

[0076] When the rotational load acting on the output shaft 6 is smaller than the biasing force applied from the coil spring 42 to the internal gear 23R, the pressing pin cannot overcome the clutch cam of the internal gear 23R, and the engagement between the pressing pin and the clutch cam of the internal gear 23R continues. The rotation of the internal gear 23R is restricted by the engagement between the pressing pin and the clutch cam of the internal gear 23R. With the rotation of the internal gear 23R restricted, when the motor 8 is driven, the spindle 61 rotates.

[0077] When the rotational load acting on the output shaft 6 exceeds the biasing force applied from the coil spring 42 to the internal gear 23R, the pressing pin overrides the clutch cam of the internal gear 23R, and the engagement between the pressing pin and the clutch cam of the internal gear 23R is released. By releasing the engagement between the pressing pin and the clutch cam of the internal gear 23R, the rotation of the internal gear 23R is allowed. With the rotation of the internal gear 23R allowed, when the motor 8 is driven, the internal gear 23R idles and the spindle 61 does not rotate.

[0078] Thus, even when the internal gear 23R is in a rotatable state, if the rotational load acting on the output shaft 6 is smaller than the biasing force applied from the coil spring 42 to the internal gear 23R, the rotation of the internal gear 23R is restricted by the elastic force of the coil spring 42. On the other hand, when the rotational load acting on the output shaft 6 exceeds the biasing force applied from the coil spring 42 to the internal gear 23R in a state where the internal gear 23R is rotatable, the internal gear 23R idles. Thereby, the rotational force transmitted from the motor 8 to the output shaft 6 is blocked.

[0079] When the change ring 18 is operated, the spring holder 41 moves in the front - rear direction. By the movement of the spring holder 41, the length (compression amount) of the coil spring 42 changes. That is, by the movement of the spring holder 41, the elastic force of the coil spring 42 changes, and the biasing force applied to the internal gear 23R is changed. Thereby, the release value when blocking the power transmitted to the output shaft 6 is set.

[0080] The connecting ring 45 is arranged around the washer 43. A convex portion is provided on the outer surface of the washer 43. A concave portion for arranging the convex portion of the washer 43 is provided on the inner surface of the connecting ring 45. By aligning the convex portion of the washer 43 and the concave portion of the connecting ring 45 in the rotational direction, the washer 43 is movable in the front - rear direction. Also, by arranging the convex portion of the washer 43 in the concave portion of the connecting ring 45, the washer 43 and the connecting ring 45 are rotatable together.

[0081] When the mode change ring 17 rotates by the operation of the operator, the connecting ring 45 can rotate together with the washer 43 and the operation ring 17A.

[0082] A forward movement restricting portion for restricting the forward movement of the washer 43 is provided in the second gear case 5B. When the forward movement of the washer 43 is restricted, the forward movement of the pressing pin engaged with the clutch cam of the internal gear 23R is also restricted.

[0083] <Switching of operating mode> When the mode change ring 17 is operated, the operating mode of the power tool 1A is changed. The operating modes include a drill mode, a clutch mode, and a vibration mode.

[0084] The drill mode is a mode in which the output shaft 6 does not vibrate in the front-rear direction and the transmission of the rotational force by the clutch mechanism 40 is not blocked. For example, the drill mode is selected when making a hole in an object using a tip tool. The drill mode is a kind of non-vibration mode.

[0085] The clutch mode is a mode in which the output shaft 6 does not vibrate in the front-rear direction and the transmission of the rotational force by the clutch mechanism 40 is blocked. For example, the clutch mode is selected when tightening a screw in an object using a tip tool. The clutch mode is a kind of non-vibration mode.

[0086] The vibration mode is a mode in which the output shaft 6 vibrates in the front-rear direction and the transmission of the rotational force by the clutch mechanism 40 is not blocked. For example, the vibration mode is selected when making a hole in an object using a tip tool.

[0087] When setting to the drill mode, the operator operates the mode change ring 17 so that the mode change ring 17 is disposed at the first rotational position. When the mode change ring 17 is operated, the cam ring 17B rotates. Due to the rotation of the cam ring 17B, the connecting ring 45 and the washer 43 rotate. The cam ring 17B and the washer 43 are disposed at the first rotational position.

[0088] When the washer 43 is disposed at the first rotational position, the forward movement restricting portion provided in the second gear case 5B engages with the washer 43, and the forward movement of the washer 43 and the pressing pin is restricted. In a state where the forward movement is restricted, the pressing pin is engaged with the clutch cam of the internal gear 23R.

[0089] Even if the internal gear 23R tries to rotate by the drive of the motor 8, since the forward movement of the pressing pin is restricted, the engagement between the pressing pin and the clutch cam of the internal gear 23R is not released. That is, since the forward movement of the pressing pin is restricted, the pressing pin cannot overcome the clutch cam of the internal gear 23R. Therefore, the rotation of the internal gear 23R is restricted. The output shaft 6 rotates based on the rotational force transmitted from the motor 8 in a state where the rotation of the internal gear 23R is restricted. When the rotational force is transmitted to the output shaft 6, the output shaft 6 rotates regardless of the magnitude of the rotational load acting on the output shaft 6.

[0090] Also, when the cam ring 17B is disposed at the first rotational position, the front portion of the vibration switching lever 33 is not disposed in the concave portion of the cam ring 17B, and the vibration switching lever 33 is disposed at the rear portion of the movable range. When the vibration switching lever 33 is disposed at the rear portion of the movable range, the opposing portion 33A of the vibration switching lever 33 and the second cam 32 are separated. The second cam 32 is rotatable together with the first cam 31 and the spindle 61. The output shaft 6 does not vibrate in the front-rear direction.

[0091] When setting to the clutch mode, the operator operates the mode change ring 17 so that the mode change ring 17 is disposed at the second rotation position. When the mode change ring 17 is operated, the cam ring 17B rotates. Due to the rotation of the cam ring 17B, the connection ring 45 and the washer 43 rotate. The cam ring 17B and the washer 43 are disposed at the second rotation position.

[0092] When the washer 43 is rotated to the second rotation position, the forward movement restricting portion provided in the second gear case 5B engages with the washer 43, and the forward movement of the washer 43 and the pressing pin is permitted. In a state where the forward movement is permitted, the pressing pin is engaged with the clutch cam of the internal gear 23R. The pressing pin is pressed against the clutch cam of the internal gear 23R by the biasing force of the coil spring 42.

[0093] When the internal gear 23R attempts to rotate due to the drive of the motor 8, if the rotational load acting on the output shaft 6 is smaller than the biasing force applied from the coil spring 42 to the internal gear 23R, the pressing pin cannot overcome the clutch cam of the internal gear 23R, and the engagement between the pressing pin and the clutch cam of the internal gear 23R continues. Due to the engagement between the pressing pin and the clutch cam of the internal gear 23R, the rotation of the internal gear 23R is restricted. In a state where the rotation of the internal gear 23R is restricted, when the motor 8 rotates, the output shaft 6 rotates.

[0094] On the other hand, if the rotational load acting on the output shaft 6 exceeds the biasing force applied from the coil spring 42 to the internal gear 23R, the pressing pin overcomes the clutch cam of the internal gear 23R, and the engagement between the pressing pin and the clutch cam of the internal gear 23R is released. Due to the release of the engagement between the pressing pin and the clutch cam of the internal gear 23R, the rotation of the internal gear 23R is permitted. In a state where the rotation of the internal gear 23R is permitted, when the motor 8 is driven, the internal gear 23R idles, and the rotational force transmitted to the output shaft 6 is interrupted. The output shaft 6 does not rotate.

[0095] Also, when the cam ring 17B is disposed at the second rotational position, the front portion of the vibration switching lever 33 is not inserted into the recess of the cam ring 17B, and the vibration switching lever 33 is disposed at the rear portion of the movable range. When the vibration switching lever 33 is disposed at the rear portion of the movable range, the opposing portion 33A of the vibration switching lever 33 and the second cam 32 are separated. The second cam 32 is rotatable together with the first cam 31 and the spindle 61. The output shaft 6 does not vibrate in the front-rear direction.

[0096] When setting to the vibration mode, the operator operates the mode change ring 17 so that the mode change ring 17 is disposed at the third rotational position. When the mode change ring 17 is operated, the cam ring 17B rotates. Due to the rotation of the cam ring 17B, the connecting ring 45 and the washer 43 rotate. The cam ring 17B and the washer 43 are disposed at the third rotational position.

[0097] When the washer 43 is disposed at the third rotational position, the forward movement restricting portion provided in the second gear case 5B engages with the washer 43, and the forward movement of the washer 43 and the pressing pin is restricted. In a state where the forward movement is restricted, the pressing pin is engaged with the clutch cam of the internal gear 23R.

[0098] Even if the internal gear 23R tries to rotate due to the drive of the motor 8, since the forward movement of the pressing pin is restricted, the engagement between the pressing pin and the clutch cam of the internal gear 23R is not released. That is, since the forward movement of the pressing pin is restricted, the pressing pin cannot overcome the clutch cam of the internal gear 23R. Therefore, the rotation of the internal gear 23R is restricted. The output shaft 6 rotates based on the rotational force transmitted from the motor 8 in a state where the rotation of the internal gear 23R is restricted. When the rotational force is transmitted to the output shaft 6, the output shaft 6 rotates regardless of the magnitude of the rotational load acting on the output shaft 6.

[0099] Further, when the cam ring 17B is disposed at the third rotational position, the front portion of the vibration switching lever 33 is inserted into the recess of the cam ring 17B, and the vibration switching lever 33 is disposed at the front portion of the movable range. When the vibration switching lever 33 is disposed at the front portion of the movable range, the opposing portion 33A of the vibration switching lever 33 contacts the claw of the second cam 32. Due to the contact between the opposing portion 33A of the vibration switching lever 33 and the second cam 32, the rotation of the second cam 32 is restricted. When the motor 8 rotates in a state where the rotation of the second cam 32 is restricted, the first cam 31 fixed to the spindle 61 rotates while hitting the cam teeth of the second cam 32. As a result, the output shaft 6 rotates while vibrating in the front-rear direction.

[0100] <Operation> Next, an example of the operation of the power tool 1A according to the present embodiment will be described. When the battery 12 is mounted on the battery mounting portion 7, power is supplied from the battery 12 to the power tool 1A. When the trigger member 14A is operated while power is being supplied from the battery 12 to the power tool 1A, a trigger signal is output from the switch body 14B. The controller 13 supplies current to the motor 8 based on the trigger signal output from the switch body 14B. When current is supplied to the motor 8, the rotor shaft 82A rotates.

[0101] Due to the rotation of the rotor shaft 82A, the spindle 61 rotates via the power transmission mechanism 10. Due to the rotation of the spindle 61, the chuck 62 rotates. Due to the rotation of the chuck 62, the tip tool attached to the chuck 62 rotates.

[0102] Due to the rotation of the rotor shaft 82A, the centrifugal fan 85 rotates. Due to the rotation of the centrifugal fan 85, air circulates around the motor 8. When air circulates around the motor 8, the motor 8 is cooled. The air that has circulated around the motor 8 is discharged from the exhaust port 4B.

[0103] <Auxiliary Handle> FIG. 3 is a perspective view showing the auxiliary handle 100A according to the present embodiment. FIG. 4 is a cross-sectional view showing the auxiliary handle 100A according to the present embodiment.

[0104] The auxiliary handle 100A is attached to the power tool 1A. In the embodiment, the auxiliary handle 100A is attached to the gear case 5. The auxiliary handle 100A receives a reaction force transmitted from the output shaft 6 to the gear case 5.

[0105] As shown in FIGS. 3 and 4, the auxiliary handle 100A has a first arm portion 101, a second arm portion 102, a rod portion 103, and a handle portion 104. The second arm portion 102 is relatively movable with respect to the first arm portion 101.

[0106] Each of the first arm portion 101 and the second arm portion 102 is attached to the gear case 5. The second arm portion 102 is relatively movable with respect to the first arm portion 101. The second arm portion 102 clamps the gear case 5 between itself and the first arm portion 101. By holding the gear case 5 by the first arm portion 101 and the second arm portion 102, the auxiliary handle 100A is attached to the power tool 1A.

[0107] The rod portion 103 is connected to the second arm portion 102. In the example shown in FIGS. 3 and 4, the first arm portion 101 is disposed on the right side of the second arm portion 102. The rod portion 103 extends leftward from the second arm portion 102. The second arm portion 102 is connected to the tip end portion (right end portion) of the rod portion 103. The handle portion 104 is fixed to the base end portion (left end portion) of the rod portion 103.

[0108] The handle portion 104 is gripped by the operator. The handle portion 104 has an internal space. A through hole 107 in which the base end portion of the rod portion 103 is disposed is formed at the right end portion of the handle portion 104. The through hole 107 connects the internal space of the handle portion 104 and the external space.

[0109] The rod portion 103 has a small-diameter portion 103A disposed in the through-hole 107 of the handle portion 104 and a large-diameter portion 103B disposed in the external space of the handle portion 104. The small-diameter portion 103A is disposed at the base end portion (left end portion) of the rod portion 103. The small-diameter portion 103A has a threaded portion. A nut 108 is disposed in the internal space of the handle portion 104. The nut 108 is fixed to the inner surface of the handle portion 104. By coupling the threaded portion of the small-diameter portion 103A and the nut 108, the rod portion 103 and the handle portion 104 are fixed.

[0110] The auxiliary handle 100A includes a tightening mechanism 110 that relatively moves the first arm portion 101 and the second arm portion 102. The tightening mechanism 110 is operated by an operator. When the tightening mechanism 110 is operated, the first arm portion 101 and the second arm portion 102 relatively move so as to approach or separate from each other.

[0111] The tightening mechanism 110 has a rod portion 111 fixed to the first arm portion 101, a slide portion 112 that is relatively movable with respect to the rod portion 111, and a guide portion 113 that guides the relative movement between the first arm portion 101 and the second arm portion 102.

[0112] At least a part of the rod portion 111 is disposed in a through-hole 105 provided in the first arm portion 101. The through-hole 105 is provided so as to extend in the left-right direction at the upper portion of the first arm portion 101. A nut 114 is disposed at the right end portion of the through-hole 105. By the nut 114, the rod portion 111 and the first arm portion 101 are fixed.

[0113] The slide portion 112 is cylindrical. The slide portion 112 is disposed in a through-hole 106 provided in the second arm portion 102. The through-hole 106 is provided so as to extend in the left-right direction at the upper portion of the second arm portion 102. The left end portion of the slide portion 112 is connected to the rod portion 103. A threaded portion is provided on the outer surface of the slide portion 112. A threaded portion is provided on the inner surface of the through-hole 106.

[0114] The rod portion 111 is connected to the slide portion 112. The first arm portion 101 and the second arm portion 102 are connected via the rod portion 111 and the slide portion 112.

[0115] The operator can operate the tightening mechanism 110 via the handle portion 104. When the handle portion 104 rotates due to the operator's operation, the slide portion 112 rotates with respect to the rod portion 111. The rod portion 111 is fixed to the first arm portion 101. Therefore, when the slide portion 112 rotates, the second arm portion 102 moves in a direction approaching the first arm portion 101 or in a direction away from the first arm portion 101.

[0116] The guide portion 113 is rod-shaped. The guide portion 113 guides the relative movement between the first arm portion 101 and the second arm portion 102. The right end portion of the guide portion 113 is connected to the first arm portion 101. The left end portion of the guide portion 113 is connected to the second arm portion 102.

[0117] Each of FIGS. 5 and 6 is a diagram showing the relationship between the power tool 1A and the auxiliary handle 100A according to the present embodiment. As shown in FIG. 5, before the operator attaches the auxiliary handle 100A to the power tool 1A, the operator operates the handle portion 104 so that the first arm portion 101 and the second arm portion 102 are separated. The operator places the gear case 5 between the first arm portion 101 and the second arm portion 102.

[0118] With the gear case 5 disposed between the first arm portion 101 and the second arm portion 102, the operator operates the handle portion 104 so that the first arm portion 101 and the second arm portion 102 approach each other. As a result, as shown in FIG. 6, the gear case 5 is tightened by the first arm portion 101 and the second arm portion 102.

[0119] The second arm portion 102 has a connecting portion 11 that engages with the engaging portion 9 of the gear case 5. The connecting portion 11 includes a convex portion that meshes with the concave portion of the engaging portion 9. The engaging portion 9 is engaged with the connecting portion 11 of the auxiliary handle 100A. In the example shown in FIGS. 5 and 6, the connecting portion 11 engages with the left engaging portion 9L. Note that by changing the left - right direction of the auxiliary handle 100A, the connecting portion 11 can engage with the right engaging portion 9R.

[0120] In the present embodiment, the second arm portion 102 is provided with a through - hole 115 into which a stopper pole (not shown) is inserted, and a dial 116 that tightens the stopper pole inserted into the through - hole 115.

[0121] In the present embodiment, a permanent magnet 117 is provided on the auxiliary handle 100A. The permanent magnets 117 are provided at the lower ends of the first arm portion 101 and the second arm portion 102, respectively. Note that the permanent magnet 117 may be provided on either the first arm portion 101 or the second arm portion 102.

[0122] <Mounting sensor> As shown in FIGS. 1 and 5, the power tool 1A includes a mounting sensor 70 that detects whether the auxiliary handle 100A is mounted on the gear case 5. In the present embodiment, the mounting sensor 70 is a magnetic sensor that detects the permanent magnet 117 of the auxiliary handle 100A. The mounting sensor 70 is disposed at a position where it can face the permanent magnet 117 when the gear case 5 is tightened by the first arm portion 101 and the second arm portion 102. The mounting sensor 70 can detect that the auxiliary handle 100A is mounted on the gear case 5 by detecting the magnetism of the permanent magnet 117.

[0123] <Controller> FIG. 7 is a block diagram showing the power tool 1A according to the present embodiment. As shown in FIG. 7, the power tool 1A includes a mounting sensor 70, a controller 13, a trigger switch 14, an inverter circuit 71, a battery 12, and a motor 8.

[0124] Based on the detection signal of the mounting sensor 70, the controller 13 outputs a control signal for controlling the rotation of the output shaft 6. In the present embodiment, based on the detection signal of the mounting sensor 70, the controller 13 sets a threshold value related to the rotation of the output shaft 6, and based on the threshold value, outputs a control signal for controlling the rotation of the output shaft 6.

[0125] In the present embodiment, the threshold value is a threshold value related to the rotational load acting on the output shaft 6. When the controller 13 determines based on the detection signal of the mounting sensor 70 that the auxiliary handle 100A is mounted, the controller 13 sets the threshold value related to the rotational load to the first torque value. When the controller 13 determines based on the detection signal of the mounting sensor 70 that the auxiliary handle 100A is not mounted, the controller 13 sets the threshold value related to the rotational load to a second torque value lower than the first torque value.

[0126] The controller 13 includes a determination unit 13A, a threshold value setting unit 13B, and a motor control unit 13C.

[0127] The determination unit 13A receives the detection signal of the mounting sensor 70. Based on the detection signal of the mounting sensor 70, the determination unit 13A determines whether the auxiliary handle 100A is mounted on the gear case 5.

[0128] The threshold value setting unit 13B sets a threshold value related to the rotational load acting on the output shaft 6 based on the detection signal of the mounting sensor 70. When the determination unit 13A determines that the auxiliary handle 100A is mounted on the gear case 5, the threshold value setting unit 13B sets the threshold value to the first torque value. When the determination unit 13A determines that the auxiliary handle 100A is not mounted on the gear case 5, the threshold value setting unit 13B sets the threshold value to the second torque value. The second torque value is lower than the first torque value.

[0129] The motor control unit 13C outputs a control signal for controlling the rotation of the output shaft 6. In the present embodiment, the motor control unit 13C outputs a control signal for controlling the rotation of the motor 8. By controlling the rotation of the motor 8, the rotation of the output shaft 6 is controlled.

[0130] The motor control unit 13C receives a trigger signal generated when the trigger switch 14 is operated, and outputs a control signal for rotating the motor 8.

[0131] In the present embodiment, the control signal output from the motor control unit 13C includes a control signal for stopping the rotation of the motor 8 when the rotational load acting on the output shaft 6 exceeds a threshold value.

[0132] The motor control unit 13C outputs a control signal to the inverter circuit 71. The inverter circuit 71 includes a plurality of switching elements, and switches the current supplied from the battery 12 to the coil 81D of the motor 8 based on the control signal output from the motor control unit 13C. For example, when six coils 81D are provided, the inverter circuit 71 controls the switching elements so that the first set of two coils 81D becomes the U-phase coil, the second set of two coils 81D becomes the V-phase coil, and the third set of two coils 81D becomes the W-phase coil. Thereby, the rotor 82 of the motor 8, which is a DC brushless motor, rotates by the current supplied from the battery 12.

[0133] The motor control unit 13C can monitor the current supplied from the battery 12 to the coil 81D via the inverter circuit 71. The rotational load acting on the output shaft 6 correlates with the current supplied from the battery 12 to the coil 81D. The higher the rotational load acting on the output shaft 6, the higher the current supplied from the battery 12 to the coil 81D, and the lower the rotational load acting on the output shaft 6, the lower the current supplied from the battery 12 to the coil 81D. The motor control unit 13C calculates the rotational load acting on the output shaft 6 based on the current supplied from the battery 12 to the coil 81D of the motor 8. The motor control unit 13C outputs a control signal for stopping the rotation of the motor 8 to the inverter circuit 71 when the rotational load acting on the output shaft 6 exceeds a threshold value.

[0134] <Control Method> FIG. 8 is a flowchart showing a control method of the power tool 1A according to the present embodiment. The determination unit 13A receives the detection signal of the mounting sensor 70. The determination unit 13A determines whether or not the auxiliary handle 100A is mounted on the gear case 5 based on the detection signal of the mounting sensor 70 (step SA1).

[0135] In step SA1, when it is determined that the auxiliary handle 100A is mounted on the gear case 5 (step SA1: Yes), the threshold setting unit 13B sets the threshold to the first torque value (step SA2).

[0136] In step SA1, when it is determined that the auxiliary handle 100A is not mounted on the gear case 5 (step SA1: No), the threshold setting unit 13B sets the threshold to a second torque value lower than the first torque value (step SA3).

[0137] When the trigger switch 14 is operated by the operator, a trigger signal for rotating the motor 8 is output from the trigger switch 14. The motor control unit 13C receives the trigger signal from the trigger switch 14. The motor control unit 13C outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SA4).

[0138] Current is supplied from the battery 12 to the coil 81D of the motor 8. The motor control unit 13C monitors the current supplied from the battery 12 to the coil 81D of the motor 8 via the inverter circuit 71. The motor control unit 13C supplies current from the battery 12 to the coil 81D of the motor 8. The motor control unit 13C calculates the rotational load acting on the output shaft 6 based on the current flowing through the coil 81D.

[0139] The motor control unit 13C determines whether or not the rotational load acting on the output shaft 6 exceeds the threshold value (step SA5).

[0140] In step SA5, when it is determined that the rotational load acting on the output shaft 6 does not exceed the threshold value (step SA5: No), the motor control unit 13C continues the rotation of the motor 8.

[0141] In step SA5, when it is determined that the rotational load acting on the output shaft 6 exceeds the threshold value (step SA5: Yes), the motor control unit 13C outputs a control signal for stopping the rotation of the motor 8 to the inverter circuit 71 (step SA6).

[0142] <Effect> As described above, according to the present embodiment, the power tool 1A includes the mounting sensor 70 that detects whether the auxiliary handle 100A is mounted. The controller 13 outputs a control signal for controlling the rotation of the output shaft 6 based on the detection signal of the mounting sensor 70. When the controller 13 determines that the auxiliary handle 100A is not mounted on the power tool 1A, the controller 13 controls the rotation of the output shaft 6 so that the rotational load acting on the output shaft 6 does not increase. In the present embodiment, when the controller 13 determines that the auxiliary handle 100A is not mounted on the power tool 1A, the controller 13 rotates the motor 8 until the rotational load acting on the output shaft 6 exceeds the second torque value, and stops the rotation of the motor 8 when the rotational load acting on the output shaft 6 exceeds the second torque value. When the work is carried out with the auxiliary handle 100A not mounted on the power tool 1A, the maximum value of the rotational load acting on the output shaft 6 is the second torque value lower than the first torque value. Therefore, it is possible to suppress a large reaction force from acting on the power tool 1A. When the controller 13 determines that the auxiliary handle 100A is mounted on the power tool 1A, the controller 13 rotates the motor 8 until the rotational load acting on the output shaft 6 exceeds the first torque value, and stops the rotation of the motor 8 when the rotational load acting on the output shaft 6 exceeds the first torque value. When the work is carried out with the auxiliary handle 100A mounted on the power tool 1A, the maximum value of the rotational load acting on the output shaft 6 is the first torque value higher than the second torque value. When the auxiliary handle 100A is mounted on the power tool 1A and the operator holds the auxiliary handle 100A, the first torque value acts on the power tool 1A.

[0143] [Second Embodiment] The second embodiment will be described. In the following description, components that are the same as or equivalent to those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0144] <Controller> FIG. 9 is a block diagram showing the power tool 1B according to the present embodiment. As shown in FIG. 9, the power tool 1A includes a mounting sensor 70, a controller 13, a speed change lever 16, a connecting member 73 connected to the speed change lever 16, and an actuator 72 that can operate the speed change lever 16 via the connecting member 73.

[0145] As described above, the speed change lever 16 is operated to switch the rotational speed of the output shaft 6 between a high-speed mode and a low-speed mode. The actuator 72 is connected to the speed change lever 16 via the connecting member 73. When the actuator 72 is driven, the speed change lever 16 moves in the front-rear direction. When the speed change lever 16 moves forward, it is switched to the low-speed mode. When the speed change lever 16 moves backward, it is switched to the high-speed mode.

[0146] Based on the detection signal of the mounting sensor 70, when the controller 13 determines that the auxiliary handle 100A is not mounted on the gear case 5, the controller 13 controls the actuator 72 so that the rotational speed of the output shaft 6 becomes the high-speed mode. That is, the controller 13 controls the actuator 72 so that the speed change lever 16 moves backward.

[0147] Based on the detection signal of the mounting sensor 70, when the controller 13 determines that the auxiliary handle 100A is mounted on the gear case 5, the controller 13 controls the actuator 72 so that the rotational speed of the output shaft 6 becomes the low-speed mode. That is, the controller 13 controls the actuator 72 so that the speed change lever 16 moves forward.

[0148] The controller 13 includes a determination unit 13D and an actuator control unit 13E.

[0149] The determination unit 13A receives the detection signal of the wearing sensor 70. Based on the detection signal of the wearing sensor 70, the determination unit 13A determines whether the auxiliary handle 100A is mounted on the gear case 5.

[0150] The actuator control unit 13E outputs a control signal for controlling the rotation of the output shaft 6. In the present embodiment, the actuator control unit 13E outputs a control signal for moving the speed change lever 16 to the actuator 72. By moving the speed change lever 16, the rotation speed of the output shaft 6 is controlled to the low speed mode or the high speed mode.

[0151] <Control method> FIG. 10 is a flowchart showing a control method of the power tool 1B according to the present embodiment. The determination unit 13D receives the detection signal of the wearing sensor 70. Based on the detection signal of the wearing sensor 70, the determination unit 13D determines whether the auxiliary handle 100A is mounted on the gear case 5 (step SB1).

[0152] In step SB1, when it is determined that the auxiliary handle 100A is mounted on the gear case 5 (step SB1: Yes), the actuator control unit 13E outputs a control signal to the actuator 72 so that the output shaft 6 is set to the low speed mode. That is, the actuator control unit 13E outputs a control signal to the actuator 72 so that the speed change lever 16 moves forward (step SB2).

[0153] In step SB1, when it is determined that the auxiliary handle 100A is not mounted on the gear case 5 (step SB1: No), the actuator control unit 13E outputs a control signal to the actuator 72 so that the output shaft 6 is set to the high speed mode. That is, the actuator control unit 13E outputs a control signal to the actuator 72 so that the speed change lever 16 moves backward (step SB3).

[0154] <Effect> As described above, according to the present embodiment, when the auxiliary handle 100A is not attached to the gear case 5, the output shaft 6 is set to the high-speed mode, and when the auxiliary handle 100A is attached to the gear case 5, the output shaft 6 is set to the low-speed mode. When working in the low-speed mode, the reaction force acting on the power tool 1B may be greater than when working in the high-speed mode. That is, the torque generated by the output shaft 6 in the low-speed mode is higher than the torque generated by the output shaft 6 in the high-speed mode. Therefore, when working in the low-speed mode, the reaction force acting on the power tool 1B may be greater. According to the present embodiment, when the auxiliary handle 100A is not attached to the power tool 1B, the output shaft 6 is set to the high-speed mode, and it is not possible to perform work in the low-speed mode. Therefore, when the auxiliary handle 100A is not attached to the power tool 1B, it is possible to suppress a large reaction force from acting on the power tool 1B. When the auxiliary handle 100A is attached to the power tool 1B, the output shaft 6 is set to the low-speed mode. In the work in the low-speed mode, when the auxiliary handle 100A is attached to the power tool 1B and the operator holds the auxiliary handle 100A, a large reaction force acts on the power tool 1B.

[0155] [Third Embodiment] The third embodiment will be described. In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description thereof will be simplified or omitted.

[0156] <Controller> FIG. 11 is a block diagram showing a power tool 1C according to the present embodiment. As shown in FIG. 11, the power tool 1C includes a mounting sensor 70, a controller 13, a trigger switch 14, an inverter circuit 71, a battery 12, a motor 8, and an acceleration sensor 74.

[0157] The acceleration sensor 74 is disposed in at least a part of the housing 2. The acceleration sensor 74 is disposed, for example, in the controller housing portion 2C. The acceleration sensor 74 detects the acceleration of the housing 2. In the operation using the power tool 1C, when a reaction force acts on the output shaft 6, it becomes difficult for the operator to stably hold the power tool 1C, and the power tool 1C may rotate about the output shaft 6. The acceleration sensor 74 detects the acceleration of the housing 2 when the power tool 1C rotates about the output shaft 6. When the power tool 1C rotates violently about the output shaft 6, the acceleration of the housing 2 becomes high.

[0158] The controller 13 outputs a control signal for controlling the rotation of the output shaft 6 based on the detection signal of the attachment sensor 70. In the present embodiment, the controller 13 sets a threshold value related to the acceleration of the housing 2 based on the detection signal of the attachment sensor 70, and outputs a control signal for controlling the rotation of the output shaft 6 based on the threshold value.

[0159] When the controller 13 determines that the auxiliary handle 100A is attached based on the detection signal of the attachment sensor 70, the controller 13 sets the threshold value related to the acceleration to the first acceleration value. When the controller 13 determines that the auxiliary handle 100A is not attached, the controller 13 sets the threshold value related to the acceleration to a second acceleration value lower than the first acceleration value.

[0160] The controller 13 includes a determination unit 13F, a threshold value setting unit 13G, and a motor control unit 13H.

[0161] The determination unit 13F receives the detection signal of the attachment sensor 70. The determination unit 13F determines whether or not the auxiliary handle 100A is attached to the gear case 5 based on the detection signal of the attachment sensor 70.

[0162] The threshold setting unit 13G sets a threshold value related to the acceleration of the housing 2 based on the detection signal of the mounting sensor 70. When the determination unit 13F determines that the auxiliary handle 100A is mounted on the gear case 5, the threshold setting unit 13G sets the threshold value to the first acceleration value. When the determination unit 13F determines that the auxiliary handle 100A is not mounted on the gear case 5, the threshold setting unit 13G sets the threshold value to the second acceleration value. The second acceleration value is lower than the first acceleration value.

[0163] The motor control unit 13H outputs a control signal for controlling the rotation of the motor 8. By controlling the rotation of the motor 8, the rotation of the output shaft 6 is controlled.

[0164] In the present embodiment, the control signal output from the motor control unit 13H includes a control signal for stopping the rotation of the motor 8 when the acceleration of the housing 2 exceeds the threshold value.

[0165] <Control method> FIG. 12 is a flowchart showing a control method of the power tool 1C according to the present embodiment. The determination unit 13F receives the detection signal of the mounting sensor 70. The determination unit 13F determines whether or not the auxiliary handle 100A is mounted on the gear case 5 based on the detection signal of the mounting sensor 70 (step SC1).

[0166] In step SC1, when it is determined that the auxiliary handle 100A is mounted on the gear case 5 (step SC1: Yes), the threshold setting unit 13G sets the threshold value to the first acceleration value (step SC2).

[0167] In step SC1, when it is determined that the auxiliary handle 100A is not mounted on the gear case 5 (step SC1: No), the threshold setting unit 13G sets the threshold value to the second acceleration value lower than the first acceleration value (step SC3).

[0168] When the operator operates the trigger switch 14, a trigger signal for rotating the motor 8 is output from the trigger switch 14. The motor control unit 13H receives the trigger signal from the trigger switch 14. The motor control unit 13H outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SC4).

[0169] The motor control unit 13H receives the detection signal of the acceleration sensor 74. The motor control unit 13H determines whether or not the acceleration of the housing 2 exceeds a threshold value based on the detection signal of the acceleration sensor 74 (step SC5).

[0170] In step SC5, when it is determined that the acceleration of the housing 2 does not exceed the threshold value (step SC5: No), the motor control unit 13H continues the rotation of the motor 8.

[0171] In step SC5, when it is determined that the acceleration of the housing 2 exceeds the threshold value (step SC5: Yes), the motor control unit 13H outputs a control signal for stopping the rotation of the motor 8 to the inverter circuit 71 (step SC6).

[0172] <Effect> As described above, according to the present embodiment, when the controller 13 determines that the auxiliary handle 100A is not attached to the power tool 1C, the controller 13 rotates the motor 8 until the acceleration of the housing 2 exceeds the second acceleration value, and stops the rotation of the motor 8 when the acceleration of the housing 2 exceeds the second acceleration value. In a state where the auxiliary handle 100A is not attached to the power tool 1C, when a reaction force acts on the output shaft 6, it becomes difficult for the operator to stably hold the power tool 1C, and the power tool 1C may rotate about the output shaft 6. In the present embodiment, the rotation of the motor 8 is stopped when the acceleration of the housing 2 exceeds a second acceleration value that is lower than the first acceleration value. That is, the rotation of the motor 8 is stopped before a large reaction force acts on the power tool 1C. Therefore, it is possible to suppress a large reaction force from acting on the power tool 1C. When the controller 13 determines that the auxiliary handle 100A is attached to the power tool 1C, the controller 13 rotates the motor 8 until the acceleration of the housing 2 exceeds the first acceleration value, and stops the rotation of the motor 8 when the acceleration of the housing 2 exceeds the first acceleration value. When the auxiliary handle 100A is attached to the power tool 1C and the operator holds the auxiliary handle 100A, a large reaction force acts on the power tool 1C.

[0173] [Fourth Embodiment] The fourth embodiment will be described. In the following description, components that are the same as or equivalent to those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

[0174] <Controller> FIG. 13 is a block diagram showing a power tool 1D according to the present embodiment. As shown in FIG. 13, the power tool 1D includes a mounting sensor 70, a controller 13, a trigger switch 14, an inverter circuit 71, a battery 12, a motor 8, and a dial 75.

[0175] In this embodiment, the power tool 1D does not have the clutch mechanism 40 described in the above embodiment. The controller 13 can set a clutch mode in which the rotation of the motor 8 is stopped when the rotational load acting on the output shaft 6 reaches the release value, and a drill mode in which the motor 8 is rotated regardless of the rotational load acting on the output shaft 6.

[0176] In the clutch mode, when the rotational load acting on the output shaft 6 exceeds the release value, the controller 13 stops the rotation of the motor 8. The release value is set by operating the dial 75. The dial 75 is provided, for example, in the controller housing portion 2C. The operator can operate the dial 75 to set the release value.

[0177] The controller 13 includes a determination unit 13I, a torque range setting unit 13J, and a motor control unit 13K.

[0178] The determination unit 13I receives the detection signal of the mounting sensor 70. Based on the detection signal of the mounting sensor 70, the determination unit 13I determines whether or not the auxiliary handle 100A is mounted on the gear case 5.

[0179] The torque range setting unit 13J sets a torque range indicating the range of the release value that can be set by the dial 75. When the determination unit 13I determines that the auxiliary handle 100A is mounted on the gear case 5, the torque range setting unit 13J sets the torque range to the first torque range. When the determination unit 13I determines that the auxiliary handle 100A is not mounted on the gear case 5, the torque range setting unit 13J sets the torque range to the second torque range.

[0180] The maximum value of the second torque range is smaller than the maximum value of the first torque range. For example, when the release value can be set in 40 steps, if the auxiliary handle 100A is attached to the gear case 5, the first torque range includes the 40-step release value. That is, the first torque range includes the first release value to the 40th release value. Among the 40-step release values, the first release value is the smallest, and the release value gradually increases as it approaches the 40th release value, with the 40th release value being the largest. When the auxiliary handle 100A is not attached to the gear case 5, the second torque range includes, for example, 20-step release values. The second torque range includes the first release value to the 20th release value. The 20th release value, which is the maximum value of the second torque range, is smaller than the 40th release value, which is the maximum value of the first torque range.

[0181] The motor control unit 13K outputs a control signal for controlling the rotation of the motor 8. By controlling the rotation of the motor 8, the rotation of the output shaft 6 is controlled.

[0182] The motor control unit 13K monitors the current supplied from the battery 12 to the coil 81D of the motor 8 via the inverter circuit 71. The motor control unit 13K calculates the rotational load acting on the output shaft 6 based on the current supplied from the battery 12 to the coil 81D of the motor 8.

[0183] <Control Method> FIG. 14 is a flowchart showing the control method of the power tool 1D according to the present embodiment. The determination unit 13I receives the detection signal of the mounting sensor 70. The determination unit 13I determines whether the auxiliary handle 100A is attached to the gear case 5 based on the detection signal of the mounting sensor 70 (step SD1).

[0184] In step SD1, when it is determined that the auxiliary handle 100A is attached to the gear case 5 (step SD1: Yes), the torque range setting unit 13J sets the torque range to the first torque range (step SD2).

[0185] In step SD1, when it is determined that the auxiliary handle 100A is not attached to the gear case 5 (step SD1: No), the torque range setting unit 13J sets the torque range to the second torque range (step SD3).

[0186] The operator operates the dial 75 to set the release value related to the rotational load for stopping the rotation of the motor 8. The operation signal of the dial 75 is output to the torque range setting unit 13J. The torque range setting unit 13J sets the release value based on the operation signal of the dial 75 (step SD4).

[0187] When the auxiliary handle 100A is attached to the gear case 5, that is, when the torque range is set to the first torque range, the operator can set an arbitrary release value from the first release value to the fortieth release value. When the auxiliary handle 100A is not attached to the gear case 5, that is, when the torque range is set to the second torque range, although the operator can set an arbitrary release value from the first release value to the twentieth release value, the operator cannot set the release value from the twenty - first release value to the fortieth release value.

[0188] When the operator operates the trigger switch 14, a trigger signal for rotating the motor 8 is output from the trigger switch 14. The motor control unit 13K receives the trigger signal from the trigger switch 14. The motor control unit 13K outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SD5).

[0189] Current is supplied from the battery 12 to the coil 81D of the motor 8. The motor control unit 13K monitors the current supplied from the battery 12 to the coil 81D of the motor 8 via the inverter circuit 71. The motor control unit 13K calculates the rotational load acting on the output shaft 6 based on the current supplied from the battery 12 to the coil 81D of the motor 8.

[0190] The motor control unit 13K determines whether the rotational load acting on the output shaft 6 exceeds the release value (step SD6).

[0191] In step SD6, if it is determined that the rotational load acting on the output shaft 6 does not exceed the release value (step SD6: No), the motor control unit 13K continues the rotation of the motor 8.

[0192] In step SD6, if it is determined that the rotational load acting on the output shaft 6 exceeds the release value (step SD6: Yes), the motor control unit 13K outputs a control signal for stopping the rotation of the motor 8 to the inverter circuit 71 (step SD7).

[0193] <Effect> As described above, according to the present embodiment, when the controller 13 determines that the auxiliary handle 100A is not attached to the power tool 1D, setting a release value greater than or equal to the 21st release value is prohibited. Thereby, an increase in the rotational load acting on the output shaft 6 is suppressed. Therefore, a large reaction force acting on the power tool 1D is suppressed. When the controller 13 determines that the auxiliary handle 100A is attached to the power tool 1A, setting a large release value (from the 21st release value to the 40th release value) is allowed. When the auxiliary handle 100A is attached to the power tool 1D and the operator holds the auxiliary handle 100A, a large reaction force acts on the power tool 1D.

[0194] [Fifth Embodiment] The fifth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is simplified or omitted.

[0195] <Controller> FIG. 15 is a block diagram showing a power tool 1E according to the present embodiment. As shown in FIG. 15, the power tool 1E includes a mounting sensor 70, a controller 13, a trigger switch 14, an inverter circuit 71, a battery 12, a motor 8, and a position sensor 76.

[0196] The position sensor 76 detects the position of the speed change lever 16. As described above, the speed change lever 16 is operated to switch the rotational speed of the output shaft 6 between the high speed mode and the low speed mode. When the speed change lever 16 is moved forward, the rotational speed of the output shaft 6 is set to the low speed mode. When the speed change lever 16 is moved backward, the rotational speed of the output shaft 6 is set to the high speed mode. The position sensor 76 can detect whether the speed change lever 16 is disposed at the front end portion or the rear end portion of the movable range of the speed change lever 16. That is, the position sensor 76 can detect whether the rotational speed of the output shaft 6 is set to the low speed mode or the high speed mode.

[0197] Based on the detection signal of the mounting sensor 70 and the detection signal of the position sensor 76, when the controller 13 determines that the auxiliary handle 100A is not mounted and that the low speed mode is set, the rotation of the motor 8 is prohibited.

[0198] Based on the detection signal of the mounting sensor 70 and the detection signal of the position sensor 76, when the controller 13 determines that the auxiliary handle 100A is not mounted and that the high speed mode is set, the controller 13 rotates the motor 8.

[0199] Based on the detection signal of the mounting sensor 70 and the detection signal of the position sensor 76, when the controller 13 determines that the auxiliary handle 100A is mounted, the controller 13 rotates the motor 8.

[0200] The controller 13 includes a determination unit 13L and a motor control unit 13M.

[0201] The determination unit 13L receives the detection signal of the mounting sensor 70. Based on the detection signal of the mounting sensor 70, the determination unit 13L determines whether or not the auxiliary handle 100A is mounted on the gear case 5.

[0202] The motor control unit 13M outputs a control signal for controlling the rotation of the motor 8. By controlling the rotation of the motor 8, the rotation of the output shaft 6 is controlled.

[0203] <Control method> FIG. 16 is a flowchart showing the control method of the power tool 1E according to the present embodiment. The determination unit 13L receives the detection signal of the mounting sensor 70. The determination unit 13L determines whether or not the auxiliary handle 100A is mounted on the gear case 5 based on the detection signal of the mounting sensor 70 (step SE1).

[0204] In step SE1, when it is determined that the auxiliary handle 100A is mounted on the gear case 5 (step SE1: Yes), the motor control unit 13M outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SE2).

[0205] In step SE1, when it is determined that the auxiliary handle 100A is not mounted on the gear case 5 (step SE1: No), the motor control unit 13M determines whether or not the high-speed mode is set based on the detection signal of the position sensor 76 (step SE3).

[0206] In step SE3, when it is determined that the high-speed mode is set (step SE3: Yes), the motor control unit 13M outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SE2). The output shaft 6 rotates in the high-speed mode.

[0207] In step SE3, when it is determined that the high-speed mode is not set (step SE3: No), the motor control unit 13M prohibits the rotation of the motor 8. Even if the motor control unit 13M receives the trigger signal, it does not rotate the motor 8. The motor control unit 13M outputs a control signal for stopping the motor 8 (step SE4).

[0208] <Effect> As described above, according to the present embodiment, when the auxiliary handle 100A is not attached and the electric power tool 1E is set to the low speed mode, the motor 8 does not rotate. Therefore, in a state where the auxiliary handle 100A is not attached, it is possible to suppress a large reaction force from acting on the electric power tool 1E. Further, even when the auxiliary handle 100A is not attached, when the electric power tool 1E is set to the high speed mode, the motor 8 rotates and the output shaft 6 rotates in the high speed mode. The torque generated by the output shaft 6 in the high speed mode is lower than the torque generated by the output shaft 6 in the low speed mode. Therefore, in the operation using the electric power tool 1E, it is possible to suppress the electric power tool 1E from rotating about the output shaft 6. In a state where the auxiliary handle 100A is attached, the motor 8 rotates and the output shaft 6 rotates in the high speed mode or the low speed mode. When the auxiliary handle 100A is attached to the electric power tool 1E and the operator holds the auxiliary handle 100A, a large reaction force acts on the electric power tool 1E.

[0209] [Sixth Embodiment] The sixth embodiment will be described. In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiments, and the description thereof will be simplified or omitted.

[0210] This embodiment is a modification of the above-described third embodiment.

[0211] FIG. 17 is a side view showing a first auxiliary handle 100B according to the present embodiment. In the present embodiment, the first auxiliary handle 100B does not have a first arm portion and a second arm portion. The first auxiliary handle 100B has a rod portion 118 and a handle portion 119. The rod portion 118 has a large diameter portion 118B and a screw portion 118C. The screw portion 118C has a smaller diameter than the large diameter portion 118B.

[0212] The gear case 5 has a convex portion 5C protruding upward. A screw hole 5D is provided in the convex portion 5C. The screw portion 118C of the first auxiliary handle 100B is inserted into the screw hole 5D provided in the gear case 5. By coupling the screw portion 118C and the screw hole 5D, the first auxiliary handle 100B is attached to the gear case 5.

[0213] FIG. 18 is a side view showing the second auxiliary handle 100C according to the present embodiment. Similar to the first auxiliary handle 100B, the second auxiliary handle 100C has a rod portion 118 and a handle portion 119. The rod portion 118 has a large-diameter portion 118B and a screw portion 118C that is inserted into the screw hole 5D of the gear case 5.

[0214] The length La of the large-diameter portion 118B of the first auxiliary handle 100B is longer than the length La of the large-diameter portion 118B of the second auxiliary handle 100C. The length Lb of the screw portion 118C of the first auxiliary handle 100B is longer than the length Lb of the screw portion 118C of the second auxiliary handle 100C. The length La and the length Lb are substantially proportional. The longer the length La, the longer the length Lb. The shorter the length La, the shorter the length Lb.

[0215] The gear case 5 has a mounting sensor 77 that detects whether the first auxiliary handle 100B or the second auxiliary handle 100C is mounted. The mounting sensor 77 is disposed inside the screw hole 5D. When the first auxiliary handle 100B or the second auxiliary handle 100C is inserted into the screw hole 5D, the first auxiliary handle 100B or the second auxiliary handle 100C contacts the mounting sensor 77. The mounting sensor 77 can detect whether the first auxiliary handle 100B or the second auxiliary handle 100C is mounted by contacting the first auxiliary handle 100B or the second auxiliary handle 100C.

[0216] The mounting sensor 77 detects the length Lb of the screw portion 118C inserted into the screw hole 5D. The mounting sensor 77 extends in the longitudinal direction of the screw hole 5D. The mounting sensor 77 can detect the length Lb based on the contact amount with the screw portion 118C. As described above, the length La and the length Lb are substantially proportional. The mounting sensor 77 can detect the length La by detecting the length Lb.

[0217] <Controller> FIG. 19 is a block diagram showing the power tool 1F according to the present embodiment. As shown in FIG. 19, the power tool 1F includes a mounting sensor 77, a controller 13, a trigger switch 14, an inverter circuit 71, a battery 12, a motor 8, and an acceleration sensor 74.

[0218] Similar to the above-described third embodiment, the acceleration sensor 74 detects the acceleration of the housing 2 when the power tool 1F rotates about the output shaft 6 during the operation using the power tool 1F. When the power tool 1F rotates violently about the output shaft 6, the acceleration of the housing 2 increases.

[0219] The controller 13 outputs a control signal for controlling the rotation of the output shaft 6 based on the detection signal of the mounting sensor 77. The controller 13 sets a threshold value related to the acceleration of the housing 2 based on the detection signal of the mounting sensor 77, and outputs a control signal for controlling the rotation of the output shaft 6 based on the threshold value. The control signal output from the controller 13 includes a control signal for stopping the rotation of the motor 8 when the acceleration of the housing 2 detected by the acceleration sensor 74 exceeds the threshold value.

[0220] As described above, the mounting sensor 77 can detect the length La of the large-diameter portion 118B of the first auxiliary handle 100B and the length La of the large-diameter portion 118B of the second auxiliary handle 100C. In the following description, the length La of the first auxiliary handle 100B is appropriately referred to as the first length, and the length La of the second auxiliary handle 100C is appropriately referred to as the second length.

[0221] When the controller 13 determines based on the detection signal of the mounting sensor 77 that the first auxiliary handle 100B having the first length is mounted, the controller 13 sets the threshold value to the first acceleration value. When the controller 13 determines that the second auxiliary handle 100C having the second length shorter than the first length is mounted, the controller 13 sets the threshold value to the second acceleration value lower than the first acceleration value. When the controller 13 determines that neither the first auxiliary handle 100B nor the second auxiliary handle 100C is mounted, the controller 13 sets the threshold value to the third acceleration value lower than the second acceleration value.

[0222] The controller 13 includes a determination unit 13N, a threshold setting unit 13O, and a motor control unit 13P.

[0223] The determination unit 13N receives the detection signal of the mounting sensor 77. Based on the detection signal of the mounting sensor 77, the determination unit 13N determines whether the first auxiliary handle 100B or the second auxiliary handle 100C is mounted on the gear case 5. Also, based on the detection signal of the mounting sensor 77, the determination unit 13N determines the length Lb and identifies which of the first auxiliary handle 100B or the second auxiliary handle 100C is mounted on the gear case 5.

[0224] The threshold setting unit 13O sets a threshold related to the acceleration of the housing 2 based on the detection signal of the mounting sensor 77. When the determination unit 13N determines that the first auxiliary handle 100B with the first length is mounted on the gear case 5, the threshold setting unit 13O sets the threshold to the first acceleration value. When the determination unit 13N determines that the second auxiliary handle 100C with the second length is mounted on the gear case 5, the threshold setting unit 13O sets the threshold to a second acceleration value lower than the first acceleration value. When the determination unit 13N determines that neither the first auxiliary handle 100B nor the second auxiliary handle 100C is mounted on the gear case 5, the threshold setting unit 13O sets the threshold to a third acceleration value lower than the second acceleration value.

[0225] The motor control unit 13P outputs a control signal for controlling the rotation of the motor 8. By controlling the rotation of the motor 8, the rotation of the output shaft 6 is controlled.

[0226] <Control method> FIG. 20 is a flowchart showing the control method of the power tool 1F according to the present embodiment. The determination unit 13N receives the detection signal of the mounting sensor 77. Based on the detection signal of the mounting sensor 77, the determination unit 13N determines whether the first auxiliary handle 100B is mounted on the gear case 5 (step SF1).

[0227] In step SF1, when it is determined that the first auxiliary handle 100B is attached to the gear case 5 (step SF1: Yes), the threshold setting unit 13O sets the threshold to the first acceleration value (step SF2).

[0228] In step SF1, when it is determined that the first auxiliary handle 100B is not attached to the gear case 5 (step SF1: No), the determination unit 13N determines whether the second auxiliary handle 100C is attached to the gear case 5 based on the detection signal of the attachment sensor 77 (step SF3).

[0229] In step SF3, when it is determined that the second auxiliary handle 100C is attached to the gear case 5 (step SF3: Yes), the threshold setting unit 13O sets the threshold to a second acceleration value lower than the first acceleration value (step SF4).

[0230] In step SF3, when it is determined that neither the first auxiliary handle 100B nor the second auxiliary handle 100C is attached to the gear case 5 (step SF3: No), the threshold setting unit 13O sets the threshold to a third acceleration value lower than the second acceleration value (step SF5).

[0231] When the operator operates the trigger switch 14, a trigger signal for rotating the motor 8 is output from the trigger switch 14. The motor control unit 13P receives the trigger signal from the trigger switch 14. The motor control unit 13P outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SF6).

[0232] The motor control unit 13P receives the detection signal of the acceleration sensor 74. The motor control unit 13P determines whether the acceleration acting on the housing 2 exceeds the threshold based on the detection signal of the acceleration sensor 74 (step SF7).

[0233] In step SF7, when it is determined that the acceleration acting on the housing 2 does not exceed the threshold value (step SF7: No), the motor control unit 13P continues the rotation of the motor 8.

[0234] In step SF7, when it is determined that the acceleration acting on the housing 2 exceeds the threshold value (step SF7: Yes), the motor control unit 13P outputs a control signal for stopping the rotation of the motor 8 to the inverter circuit 71 (step SF8).

[0235] <Effect> As described above, according to the present embodiment, when the controller 13 determines that the first auxiliary handle 100B and the second auxiliary handle 100C are not attached to the power tool 1F, the controller 13 rotates the motor 8 until the acceleration of the housing 2 exceeds the third acceleration value, and stops the rotation of the motor 8 when the acceleration of the housing 2 exceeds the third acceleration value. In a state where the first auxiliary handle 100B and the second auxiliary handle 100C are not attached to the power tool 1F, when a reaction force acts on the output shaft 6, the power tool 1C may rotate violently about the output shaft 6. In the present embodiment, the rotation of the motor 8 is stopped when the acceleration of the housing 2 exceeds the third acceleration value. That is, the rotation of the motor 8 is stopped before a large reaction force acts on the power tool 1F. Therefore, it is possible to suppress a large reaction force from acting on the power tool 1F. When the controller 13 determines that the second auxiliary handle 100C is attached to the power tool 1F, the controller 13 rotates the motor 8 until the acceleration of the housing 2 exceeds the second acceleration value, and stops the rotation of the motor 8 when the acceleration of the housing 2 exceeds the second acceleration value. In a state where the second auxiliary handle 100C is attached to the power tool 1F, even if a reaction force acts on the output shaft 6, the operator can stably hold the power tool 1F by holding the second auxiliary handle 100C. When the controller 13 determines that the first auxiliary handle 100B is attached to the power tool 1F, the controller 13 rotates the motor 8 until the acceleration of the housing 2 exceeds the first acceleration value, and stops the rotation of the motor 8 when the acceleration of the housing 2 exceeds the first acceleration value. The first auxiliary handle 100B is longer than the second auxiliary handle 100C. Therefore, in a state where the first auxiliary handle 100B is attached to the power tool 1F, even if a larger reaction force acts on the output shaft 6, the operator can stably hold the power tool 1F by holding the first auxiliary handle 100B.

[0236] [Seventh Embodiment] The seventh embodiment will be described. In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description thereof will be simplified or omitted.

[0237] This embodiment is a modification of the above-described fourth embodiment. Also, similar to the above-described sixth embodiment, the gear case 5 has a screw hole 5D, and the first auxiliary handle 100B or the second auxiliary handle 100C is attached to the gear case 5.

[0238] <Controller> FIG. 21 is a block diagram showing the power tool 1G according to this embodiment. As shown in FIG. 21, the power tool 1D includes a mounting sensor 77, a controller 13, a trigger switch 14, an inverter circuit 71, a battery 12, a motor 8, and a dial 75.

[0239] Similar to the above-described fourth embodiment, the power tool 1F does not have a clutch mechanism 40. The controller 13 can set a clutch mode in which the rotation of the motor 8 is stopped when the rotational load acting on the output shaft 6 reaches a release value, and a drill mode in which the motor 8 is rotated regardless of the rotational load acting on the output shaft 6.

[0240] In the clutch mode, the controller 13 stops the rotation of the motor 8 when the rotational load acting on the output shaft 6 exceeds the release value. The release value is set by operating the dial 75. The dial 75 is provided, for example, in the controller housing portion 2C. The operator can operate the dial 75 to set the release value.

[0241] The controller 13 includes a determination unit 13Q, a torque range setting unit 13R, and a motor control unit 13S.

[0242] The determination unit 13Q receives the detection signal of the mounting sensor 77. Based on the detection signal of the mounting sensor 77, the determination unit 13Q determines whether the first auxiliary handle 100B or the second auxiliary handle 100C is attached to the gear case 5. Also, based on the detection signal of the mounting sensor 77, the determination unit 13Q determines the length Lb and identifies which auxiliary handle of the first auxiliary handle 100B or the second auxiliary handle 100C is attached to the gear case 5.

[0243] The torque range setting unit 13R sets a torque range indicating the range of release values that can be set by the dial 75. When the determination unit 13Q determines that the first auxiliary handle 100B is attached to the gear case 5, the torque range setting unit 13R sets the torque range to the first torque range. When the determination unit 13Q determines that the second auxiliary handle 100C is attached to the gear case 5, the torque range setting unit 13R sets the torque range to the second torque range. When the determination unit 13Q determines that neither the first auxiliary handle 100B nor the second auxiliary handle 100C is attached to the gear case 5, the torque range setting unit 13R sets the torque range to the third torque range.

[0244] The maximum value of the third torque range is smaller than the maximum value of the second torque range. The maximum value of the second torque range is smaller than the maximum value of the first torque range. For example, when the release value can be set in 40 steps, when the first auxiliary handle 100B is attached to the gear case 5, the first torque range includes the release value of 40 steps. That is, the first torque range includes the first release value to the 40th release value. Among the 40 steps of release values, the first release value is the smallest, and the release value gradually increases as it approaches the 40th release value, and the 40th release value is the largest. When the second auxiliary handle 100C is attached to the gear case 5, the second torque range includes, for example, the release value of 30 steps. The second torque range includes the first release value to the 30th release value. When neither the first auxiliary handle 100B nor the second auxiliary handle 100C is attached to the gear case 5, the third torque range includes, for example, the release value of 20 steps. The third torque range includes the first release value to the 20th release value.

[0245] The 20th release value, which is the maximum value of the third torque range, is smaller than the 30th release value, which is the maximum value of the second torque range. The 30th release value, which is the maximum value of the second torque range, is smaller than the 40th release value, which is the maximum value of the first torque range.

[0246] The motor control unit 13S outputs a control signal for controlling the rotation of the motor 8. By controlling the rotation of the motor 8, the rotation of the output shaft 6 is controlled.

[0247] The motor control unit 13S monitors the current supplied from the battery 12 to the coil 81D of the motor 8 via the inverter circuit 71. The motor control unit 13S calculates the rotational load acting on the output shaft 6 based on the current supplied from the battery 12 to the coil 81D of the motor 8.

[0248] <Control method> FIG. 22 is a flowchart showing a control method of the power tool 1G according to the present embodiment. The determination unit 13Q receives the detection signal of the mounting sensor 77. The determination unit 13Q determines whether or not the first auxiliary handle 100B is mounted on the gear case 5 based on the detection signal of the mounting sensor 77 (step SG1).

[0249] In step SG1, when it is determined that the first auxiliary handle 100B is mounted on the gear case 5 (step SG1: Yes), the torque range setting unit 13R sets the torque range to the first torque range (step SG2).

[0250] In step SG1, when it is determined that the first auxiliary handle 100B is not mounted on the gear case 5 (step SG1: No), the determination unit 13Q determines whether or not the second auxiliary handle 100C is mounted on the gear case 5 based on the detection signal of the mounting sensor 77 (step SG3).

[0251] In step SG3, when it is determined that the second auxiliary handle 100C is mounted on the gear case 5 (step SG3: Yes), the torque range setting unit 13R sets the torque range to the second torque range (step SG4).

[0252] In step SG3, when it is determined that neither the first auxiliary handle 100B nor the second auxiliary handle 100C is mounted on the gear case 5 (step SG3: No), the torque range setting unit 13R sets the torque range to the third torque range (step SG5).

[0253] The operator operates the dial 75 to set the release value related to the rotational load for stopping the rotation of the motor 8. The operation signal of the dial 75 is output to the torque range setting unit 13R. The torque range setting unit 13R sets the release value based on the operation signal of the dial 75 (step SG6).

[0254] When the first auxiliary handle 100B is attached to the gear case 5, that is, when the torque range is set to the first torque range, the operator can set any release value from the first release value to the fortieth release value. When the second auxiliary handle 100C is attached to the gear case 5, that is, when the torque range is set to the second torque range, although the operator can set any release value from the first release value to the thirtieth release value, the operator cannot set the release value from the thirty - first release value to the fortieth release value. When neither the first auxiliary handle 100B nor the second auxiliary handle 100C is attached to the gear case 5, that is, when the torque range is set to the third torque range, although the operator can set any release value from the first release value to the twentieth release value, the operator cannot set the release value from the twenty - first release value to the fortieth release value.

[0255] When the trigger switch 14 is operated by the operator, a trigger signal for rotating the motor 8 is output from the trigger switch 14. The motor control unit 13S receives the trigger signal from the trigger switch 14. The motor control unit 13S outputs a control signal for rotating the motor 8 to the inverter circuit 71 based on the trigger signal (step SG7).

[0256] Current is supplied from the battery 12 to the coil 81D of the motor 8. The motor control unit 13S monitors the current supplied from the battery 12 to the coil 81D of the motor 8 via the inverter circuit 71. The motor control unit 13S calculates the rotational load acting on the output shaft 6 based on the current supplied from the battery 12 to the coil 81D of the motor 8.

[0257] The motor control unit 13S determines whether the rotational load acting on the output shaft 6 exceeds the release value (step SG8).

[0258] In step SG8, if it is determined that the rotational load acting on the output shaft 6 does not exceed the release value (step SG8: No), the motor control unit 13S continues the rotation of the motor 8.

[0259] In step SG8, if it is determined that the rotational load acting on the output shaft 6 exceeds the release value (step SG8: Yes), the motor control unit 13S outputs a control signal for stopping the rotation of the motor 8 to the inverter circuit 71 (step SG9).

[0260] <Effect> As described above, according to the present embodiment, when the controller 13 determines that the first auxiliary handle 100B and the second auxiliary handle 100C are not attached to the power tool 1G, it prohibits setting a release value greater than or equal to the 21st release value. Thereby, an increase in the rotational load acting on the output shaft 6 is suppressed. Therefore, a large reaction force acting on the power tool 1F is suppressed. When the controller 13 determines that the second auxiliary handle 100C is attached to the power tool 1A, it allows setting the release value up to the 30th release value. Even if a large reaction force acts on the power tool 1G in the operation using the power tool 1G when a large release value such as the 30th release value is set, the operator can receive the reaction force acting on the power tool 1G by holding the second auxiliary handle 100C attached to the power tool 1G. When the controller 13 determines that the first auxiliary handle 100B is attached to the power tool 1A, it allows setting the release value up to the 40th release value. Even if a large reaction force acts on the power tool 1G in the operation using the power tool 1G when a larger release value such as the 40th release value is set, the operator can receive the reaction force acting on the power tool 1G by holding the first auxiliary handle 100B attached to the power tool 1G.

[0261] [Eighth Embodiment] The eighth embodiment will be described. In the following description, components that are the same as or equivalent to those in the above-described embodiments are denoted by the same reference numerals, and the description thereof will be made brief or omitted.

[0262] <Auxiliary handle> FIG. 23 is a side view showing the auxiliary handle 100D according to the present embodiment. FIG. 24 is a cross-sectional view showing the auxiliary handle 100D according to the present embodiment.

[0263] The auxiliary handle 100D according to the present embodiment is applied to the power tool 1A including the mounting sensor 70 described in the first embodiment above. In the present embodiment, the mounting sensor 70 detects whether or not the auxiliary handle 100D is mounted on at least a part of the power tool 1A and at least a part of the auxiliary handle 100D is gripped by the operator. In the present embodiment, the mounting sensor 70 does not have to be a magnetic sensor.

[0264] As shown in FIGS. 23 and 24, the auxiliary handle 100D includes a first arm portion 201, a second arm portion 202, a rod portion 203, a handle portion 204, and a pipe portion 209. The second arm portion 202 is relatively movable with respect to the first arm portion 201.

[0265] Each of the first arm portion 201 and the second arm portion 202 is mounted on the gear case 5. The first arm portion 201 and the second arm portion 202 are relatively movable in the left-right direction. The second arm portion 202 clamps the gear case 5 between itself and the first arm portion 201. The gear case 5 is clamped by the relative movement of the first arm portion 201 and the second arm portion 202 in the left-right direction. By clamping the gear case 5 by the first arm portion 201 and the second arm portion 202, the auxiliary handle 100D is mounted on the power tool 1A.

[0266] The rod portion 203 extends in the left - right direction. The rod portion 203 is tubular. The rod portion 203 has an internal space. The rod portion 203 is connected to the second arm portion 202. The first arm portion 201 is disposed on the right side (tip side) of the second arm portion 202. The second arm portion 202 is connected to the right end portion (tip portion) of the rod portion 203. The left end face of the rod portion 203 is connected to the right end face of the handle portion 204 via a washer 216.

[0267] The handle portion 204 is grasped by an operator. The handle portion 204 has an internal space. A through - hole 207 is formed in the right end portion (tip portion) of the handle portion 204. The through - hole 207 connects the internal space and the external space of the handle portion 204.

[0268] The pipe portion 209 is cylindrical. The right part of the pipe portion 209 is disposed inside the rod portion 203. The left part of the pipe portion 209 is disposed in the through - hole 207 of the handle portion 204. A nut portion 208 is provided at the left end portion of the rod portion 203. The nut portion 208 is fixed to the inner surface of the handle portion 204. The nut portion 208 fixes the pipe portion 209 and the handle portion 204. The pipe portion 209 and the rod portion 203 are fixed. The rod portion 203 and the handle portion 204 are fixed via the pipe portion 209.

[0269] The auxiliary handle 100D includes a tightening mechanism 210 for relatively moving the first arm portion 201 and the second arm portion 202. The tightening mechanism 210 is operated by an operator. When the tightening mechanism 210 is operated, the first arm portion 201 and the second arm portion 202 relatively move so as to approach or separate from each other.

[0270] The tightening mechanism 210 has a pipe portion 211 fixed to the first arm portion 201 and a slide portion 212 supported by the second arm portion 202. The slide portion 212 is relatively movable with respect to the pipe portion 211.

[0271] The pipe portion 211 is cylindrical. At least a part of the pipe portion 211 is disposed in a through hole 205 provided in the first arm portion 201. The through hole 205 extends in the left - right direction at the upper part of the first arm portion 201. A nut portion 214 is provided at the right end portion of the pipe portion 211. The nut portion 214 is fixed to the inner surface of the through hole 205. The nut portion 214 fixes the pipe portion 211 and the first arm portion 201.

[0272] The slide portion 212 is cylindrical. The slide portion 212 is disposed in a through hole 206 provided in the second arm portion 202. The through hole 206 extends in the left - right direction at the upper part of the second arm portion 202. The left end portion of the slide portion 212 is fixed to the right end portion of the rod portion 203. A thread is provided on the outer surface of the slide portion 212. A thread groove is provided on the inner surface of the through hole 206.

[0273] At least a part of the pipe portion 211 is disposed inside the slide portion 212. The pipe portion 211 and the slide portion 212 can move relative to each other in the axial direction of the pipe portion 211. The first arm portion 201 and the second arm portion 202 are connected via the pipe portion 211 and the slide portion 212.

[0274] An operator can operate the tightening mechanism 210 via the handle portion 204. The operator can operate the handle portion 204 so that the handle portion 204 rotates. When the handle portion 204 is rotated by the operator, the rod portion 203 and the slide portion 212 rotate. The pipe portion 211 is fixed to the first arm portion 201. Therefore, when the slide portion 212 rotates, the second arm portion 202 moves in a direction approaching the first arm portion 201 or in a direction separating from the first arm portion 201.

[0275] Note that the second arm portion 202 is provided with a through hole 215 into which a stopper pole (not shown) is inserted.

[0276] When the operator attaches the auxiliary handle 100D to the power tool 1A, the operator operates the handle portion 204 so that the first arm portion 201 and the second arm portion 202 are separated. The operator disposes the gear case 5 between the first arm portion 201 and the second arm portion 202.

[0277] With the gear case 5 disposed between the first arm portion 201 and the second arm portion 202, the operator operates the handle portion 204 so that the first arm portion 201 and the second arm portion 202 approach each other. As a result, the gear case 5 is clamped by the first arm portion 201 and the second arm portion 202.

[0278] The second arm portion 202 has a connecting portion 11B that engages with the engaging portion 9 of the gear case 5. The connecting portion 11B includes a convex portion that meshes with the concave portion of the engaging portion 9. The engaging portion 9 is engaged with the connecting portion 11B of the auxiliary handle 100D.

[0279] FIG. 25 is a cross-sectional view showing the handle portion 204 of the auxiliary handle 100D according to the present embodiment. FIG. 26 is a view showing the first arm portion 201 of the auxiliary handle 100D according to the present embodiment.

[0280] As shown in FIGS. 24, 25, and 26, the auxiliary handle 100D includes an operating rod 220, an operation lever 221, a first elastic member 222, an operating lever 223, and a second elastic member 224.

[0281] At least a part of the operating rod 220 is supported by the first arm portion 201 and the second arm portion 202. The operating rod 220 can move relative to the first arm portion 201 and the second arm portion 202. The operating rod 220 is movable in the left-right direction.

[0282] Part of the actuating rod 220 is disposed in the internal space of the pipe portion 211. Part of the actuating rod 220 is disposed in the internal space of the slide portion 212. Part of the actuating rod 220 is supported by the first arm portion 201 via the pipe portion 211. Part of the actuating rod 220 is supported by the second arm portion 202 via the slide portion 212. Part of the actuating rod 220 is disposed in the internal space of the rod portion 203. Part of the actuating rod 220 is disposed in the internal space of the pipe portion 209. Part of the actuating rod 220 is disposed in the internal space of the handle portion 204.

[0283] The operation lever 221 is disposed in the handle portion 204. Part of the operation lever 221 is disposed in the opening 217 provided in the handle portion 204. The opening 217 is formed so as to connect the internal space and the external space of the handle portion 204. Part of the operation lever 221 is disposed in the internal space of the handle portion 204. Part of the operation lever 221 is disposed so as to protrude from the outer surface of the handle portion 204.

[0284] The left end portion (base end portion) of the actuating rod 220 faces the right end portion of the operation lever 221 in the internal space of the handle portion 204.

[0285] The operation lever 221 is rotatably supported by the handle portion 204 via a pivot 225 (first pivot). The pivot 225 is disposed in the internal space of the handle portion 204. The pivot 225 connects the right end portion of the operation lever 221 and the handle portion 204. In FIG. 25, the pivot 225 is disposed above the left end portion of the actuating rod 220.

[0286] The first elastic member 222 is disposed in the internal space of the handle portion 204. The first elastic member 222 is connected to each of the operation lever 221 and the handle portion 204. The first elastic member 222 is a coil spring. In FIG. 25, the upper end portion of the first elastic member 222 is connected to the lower portion of the operation lever 221. The lower end portion of the first elastic member 222 is connected to the bottom of the internal space of the handle portion 204. In the present embodiment, a convex portion 226 is provided at the lower portion of the operation lever 221. A concave portion 227 is provided at the bottom of the internal space of the handle portion 204. The upper end portion of the first elastic member 222 is supported by the convex portion 226. The lower end portion of the first elastic member 222 is supported by the concave portion 227.

[0287] The first elastic member 222 is disposed between the operation lever 221 and the handle portion 204 in a compressed state. The first elastic member 222 generates an elastic force (biasing force) so that the operation lever 221 protrudes from the internal space of the handle portion 204.

[0288] The operation lever 223 is disposed inside the first arm portion 201. The operation lever 223 is rotatably supported by the first arm portion 201 via a pivot 228 (second pivot). As shown in FIGS. 24 and 26, the operation lever 223 has an upper end portion 223A facing the right end surface of the operation rod 220, a lower end portion 223B, and an intermediate portion 223C connected to the first arm portion 201 via the pivot 228. The operation lever 223 can rotate about the pivot 228 such that the upper end portion 223A moves to the right and the lower end portion 223B moves to the left. The operation lever 223 can rotate about the pivot 228 such that the upper end portion 223A moves to the left and the lower end portion 223B moves to the right.

[0289] The second elastic member 224 is disposed inside the first arm portion 201. The second elastic member 224 is disposed around the pivot 228. The second elastic member 224 is a torsion spring. The second elastic member 224 generates an elastic force (biasing force) so that the operation lever 223 rotates in one direction. The second elastic member 224 generates an elastic force such that the upper end portion 223A moves to the left and the lower end portion 223B moves to the right.

[0290] The operation lever 221 is movable in a state where the gear case 5 is clamped by the first arm portion 201 and the second arm portion 202. An operator can operate the operation lever 221 by gripping the handle portion 204. The operation lever 221 moves when the handle portion 204 is gripped by the operator.

[0291] The operator can operate the operation lever 221 so that the operation lever 221 moves into the internal space of the handle portion 204. The operation lever 221 is rotatably supported by the handle portion 204 via a pivot 225. When the operation lever 221 is operated to move into the internal space of the handle portion 204, the operation lever 221 rotates about the pivot 225. The operation lever 221 rotates so that the right end portion of the operation lever 221 moves rightward.

[0292] The actuating rod 220 moves by the movement of the operation lever 221. When the right end portion of the operation lever 221 moves rightward, the actuating rod 220 is pushed by the operation lever 221 and moves rightward.

[0293] The actuating lever 223 moves by the movement of the operation lever 221 and the actuating rod 220. When the right end portion of the operation lever 221 moves rightward and the actuating rod 220 moves rightward, the upper end portion 223A of the actuating lever 223 is pushed by the actuating rod 220 and moves rightward. When the upper end portion 223A of the actuating lever 223 moves rightward, the actuating lever 223 rotates so that the lower end portion 223B moves leftward.

[0294] The auxiliary handle 100D includes a control board 250, a grip sensor 251, a signal output portion 252, and a battery 253.

[0295] The control board 250 is disposed inside the first arm portion 201. The control board 250 is held by the first arm portion 201. The control board 250 is connected to each of the grip sensor 251 and the signal output portion 252.

[0296] The grip sensor 251 is disposed inside the first arm portion 201. The grip sensor 251 is supported by the control board 250.

[0297] The grip sensor 251 detects whether the handle portion 204 is gripped by an operator in a state where the gear case 5 is clamped by the first arm portion 201 and the second arm portion 202.

[0298] In the present embodiment, the grip sensor 251 detects the movement of the operating lever 223 to detect whether the handle portion 204 is gripped by an operator. The grip sensor 251 detects the movement of the lower end portion 223B of the operating lever 223.

[0299] As described above, when the handle portion 204 is gripped by an operator, the operation lever 221 is operated. When the operation lever 221 is operated so as to move into the internal space of the handle portion 204, the operating rod 220 is pushed by the operation lever 221 and moves rightward. When the operating rod 220 moves rightward, the operating lever 223 rotates such that the lower end portion 223B moves leftward. That is, when the handle portion 204 is gripped by an operator, the lower end portion 223B moves and the position of the lower end portion 223B changes. The grip sensor 251 can detect that the handle portion 204 is gripped by an operator by detecting the position of the lower end portion 223B. The grip sensor 251 detects the lower end portion 223B in a non-contact manner. A photo sensor is exemplified as the grip sensor 251.

[0300] The signal output unit 252 is disposed at the lower end of the first arm portion 201. The signal output unit 252 is connected to the control board 250 via a lead wire 254. Note that the signal output unit 252 may be provided at the lower end of the second arm portion 202, or may be provided at each of the lower ends of the first arm portion 201 and the second arm portion 202. The signal output unit 252 is disposed at a position where it can face the mounting sensor 70 of the power tool 1A when the gear case 5 is clamped by the first arm portion 201 and the second arm portion 202.

[0301] Based on the detection signal of the grip sensor 251, the signal output unit 252 outputs a grip signal indicating that the handle portion 204 is gripped by the operator to the mounting sensor 70 of the power tool 1A.

[0302] The battery 253 supplies power to each of the control board 250, the grip sensor 251, and the signal output unit 252. The battery 253 functions as a power source for each of the control board 250, the grip sensor 251, and the signal output unit 252.

[0303] By gripping the handle portion 204, the operator can operate the operation lever 221 so that the operation lever 221 moves into the internal space of the handle portion 204. The operation lever 221 is rotatably supported by the handle portion 204 via a pivot 225. When the operation lever 221 is operated to move into the internal space of the handle portion 204, it rotates about the pivot 225. The operation lever 221 rotates so that the right end portion of the operation lever 221 moves to the right.

[0304] The actuating rod 220 moves as the operation lever 221 moves. When the right end portion of the operation lever 221 moves to the right, the actuating rod 220 is pushed by the operation lever 221 and moves to the right.

[0305] The actuating lever 223 moves as the operation lever 221 and the actuating rod 220 move. When the right end portion of the operation lever 221 moves to the right and the actuating rod 220 moves to the right, the upper end portion 223A of the actuating lever 223 is pushed by the actuating rod 220 and moves to the right. When the upper end portion 223A of the actuating lever 223 moves to the right, the actuating lever 223 rotates so that the lower end portion 223B moves to the left.

[0306] The grip sensor 251 detects the movement of the lower end portion 223B of the operating lever 223. By detecting the position of the lower end portion 223B, the grip sensor 251 can detect whether the handle portion 204 is gripped by the operator. The grip sensor 251 can detect that the handle portion 204 is gripped by the operator by detecting the position of the lower end portion 223B that has moved to the left. The detection signal of the grip sensor 251 is transmitted to the control board 250.

[0307] Based on the detection signal of the grip sensor 251, when the control board 250 determines that the handle portion 204 is gripped by the operator, the control board 250 transmits a control signal for operating the signal output portion 252 to the signal output portion 252.

[0308] Based on the control signal from the control board 250, the signal output portion 252 outputs a grip signal indicating that the handle portion 204 is gripped by the operator. The attachment sensor 70 receives the grip signal from the signal output portion 252. The attachment sensor 70 can detect whether the handle portion 204 is gripped by the operator based on the grip signal from the signal output portion 252.

[0309] Based on the detection signal of the attachment sensor 70, the controller 13 of the power tool 1A outputs a control signal for controlling the rotation of the output shaft 6. The detection signal of the attachment sensor 70 includes a grip signal. Based on the grip signal, the controller 13 sets a threshold value related to the rotation of the output shaft 6 and outputs a control signal for controlling the rotation of the output shaft 6 based on the threshold value. Based on the grip signal indicating that the handle portion 204 is gripped by the operator, the controller 13 sets the threshold value to the first torque value.

[0310] When the operation of the operation lever 221 is released, the operation lever 221 rotates so as to move outward from the internal space of the handle portion 204 by the elastic force of the first elastic member 222. The operation lever 221 rotates so that the right end portion of the operation lever 221 moves leftward. When the right end portion of the operation lever 221 moves leftward, the operating rod 220 moves leftward by the elastic force of the second elastic member 224. That is, when the right end portion of the operation lever 221 moves leftward and the force from the operation lever 221 is no longer applied to the operating rod 220 and the operation lever 223, the operation lever 223 rotates about the pivot 228 so that the upper end portion 223A moves leftward and the lower end portion 223B moves rightward by the elastic force of the second elastic member 224. When the upper end portion 223A of the operation lever 223 moves leftward, the operating rod 220 is pushed by the upper end portion 223A and moves leftward.

[0311] The grip sensor 251 can detect that the operation of the operation lever 221 has been released by detecting the position of the lower end portion 223B that has moved rightward. The detection signal of the grip sensor 251 is transmitted to the control board 250.

[0312] When the control board 250 determines based on the detection signal of the grip sensor 251 that the operation of the operation lever 221 has been released, the control board 250 transmits a control signal for stopping the operation of the signal output unit 252 to the signal output unit 252.

[0313] The signal output unit 252 outputs a grip release signal indicating that the operation of the operation lever 221 has been released based on the control signal from the control board 250. The attachment sensor 70 receives the grip release signal from the signal output unit 252. The attachment sensor 70 can detect whether or not the operation of the operation lever 221 has been released based on the grip release signal from the signal output unit 252.

[0314] The controller 13 of the power tool 1A outputs a control signal for controlling the rotation of the output shaft 6 based on the detection signal of the mounting sensor 70. The detection signal of the mounting sensor 70 includes a grip release signal. The controller 13 sets a threshold value to a second torque value lower than the first torque value based on the grip release signal.

[0315] <Effect> As described above, according to the present embodiment, the power tool 1A includes a mounting sensor 70 that detects whether the auxiliary handle 100D is mounted and whether the handle portion 204 of the auxiliary handle 100D is held by the operator. The controller 13 outputs a control signal for controlling the rotation of the output shaft 6 based on the grip signal or the grip release signal received by the mounting sensor 70. When the controller 13 determines that the auxiliary handle 100D is mounted on at least a part of the power tool 1A but the handle portion 204 is not held by the operator, the controller 13 controls the rotation of the output shaft 6 so that the rotational load acting on the output shaft 6 does not increase. Therefore, it is possible to suppress a large reaction force from acting on the power tool 1A. When the controller 13 determines that the auxiliary handle 100D is mounted on at least a part of the power tool 1A and the handle portion 204 is held by the operator, the controller 13 controls the rotation of the output shaft 6 so that the rotational load acting on the output shaft 6 increases. The operator can receive the reaction force acting on the power tool 1A by gripping the handle portion 204 of the auxiliary handle 100D mounted on the power tool 1A.

[0316] <Modification> In the present embodiment, the control board 250 and the grip sensor 251 may be arranged on the second arm portion 202.

[0317] [Ninth Embodiment] The ninth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is simplified or omitted.

[0318] <Auxiliary Handle> FIG. 27 is a side view showing the auxiliary handle 100E according to the present embodiment. FIG. 28 is a cross-sectional view showing the handle portion 204 of the auxiliary handle 100E according to the present embodiment.

[0319] In the above-described eighth embodiment, the control board 250 and the grip sensor 251 are arranged on the first arm portion 201. In the present embodiment, an example in which the control board 2500 and the grip sensor 2510 are arranged on the handle portion 204 will be described.

[0320] As shown in FIG. 27, the auxiliary handle 100E includes a signal output portion 252. Similar to the above-described eighth embodiment, the signal output portion 252 is arranged at the lower end portion of the first arm portion 201.

[0321] As shown in FIG. 28, the auxiliary handle 100E includes an operation lever 2210, an elastic member 2220, a control board 2500, and a grip sensor 2510.

[0322] The operation lever 2210 is arranged on the handle portion 204. A part of the operation lever 2210 is arranged in an opening 2170 provided in the handle portion 204. The opening 2170 is formed so as to connect the internal space and the external space of the handle portion 204. A part of the operation lever 2210 is arranged in the internal space of the handle portion 204. A part of the operation lever 2210 is arranged so as to protrude from the outer surface of the handle portion 204.

[0323] The operation lever 2210 is rotatably supported by the handle portion 204 via a pivot 2250. The pivot 2250 is arranged in the internal space of the handle portion 204. The pivot 2250 connects the left end portion of the operation lever 2210 and the handle portion 204.

[0324] The elastic member 2220 is disposed in the internal space of the handle portion 204. The elastic member 2220 is connected to each of the operation lever 2210 and the handle portion 204. The elastic member 2220 is a coil spring. In FIG. 28, the upper end portion of the elastic member 2220 is connected to the lower portion of the operation lever 2210. The lower end portion of the elastic member 2220 is connected to the bottom of the internal space of the handle portion 204.

[0325] The elastic member 2220 is disposed between the operation lever 2210 and the handle portion 204 in a compressed state. The elastic member 2220 generates an elastic force (biasing force) so that the operation lever 2210 moves outward from the internal space of the handle portion 204.

[0326] The control board 2500 is disposed in the internal space of the handle portion 204. The control board 2500 is held by the handle portion 204. The control board 2500 is connected to each of the grip sensor 2510 and the signal output portion 252.

[0327] The grip sensor 2510 is disposed in the internal space of the handle portion 204. The grip sensor 2510 is supported by the control board 2500.

[0328] The grip sensor 2510 detects the movement of the operation lever 2210 and detects whether the handle portion 204 is held by an operator. In the present embodiment, the grip sensor 2510 detects the movement of the right end portion of the operation lever 2210.

[0329] When the handle portion 204 is held by an operator and the operation lever 2210 rotates, the position of the right end portion of the operation lever 2210 changes. The grip sensor 2510 can detect whether the handle portion 204 is held by an operator by detecting the position of the right end portion of the operation lever 2210. The grip sensor 2510 detects the right end portion of the operation lever 2210 in a non-contact manner. In the present embodiment, a permanent magnet 2211 is disposed at the right end portion of the operation lever 2210. The grip sensor 2510 is a magnetic sensor.

[0330] The signal output unit 252 is connected to the control board 2500 via the lead wire 2540. At least a part of the lead wire 2540 is disposed in the internal space of the rod portion 203.

[0331] When the handle portion 204 is gripped by an operator, the operation lever 2210 is operated so as to move into the internal space of the handle portion 204. When the operation lever 2210 is operated so as to move into the internal space of the handle portion 204, the operation lever 2210 rotates about the pivot 2250. The operation lever 2210 rotates so that the right end portion of the operation lever 2210 moves rightward. When the right end portion of the operation lever 2210 moves rightward, the distance between the grip sensor 2510 and the permanent magnet 2211 becomes shorter.

[0332] The grip sensor 2510 detects the position of the right end portion of the operation lever 2210 by detecting the permanent magnet 2211. The grip sensor 2510 can detect whether or not the handle portion 204 is gripped by an operator by detecting the position of the right end portion of the operation lever 2210. The grip sensor 2510 can detect that the handle portion 204 is gripped by an operator by detecting the position of the right end portion of the operation lever 2210 that has moved rightward. The detection signal of the grip sensor 2510 is transmitted to the control board 2500.

[0333] When the control board 2500 determines that the handle portion 204 is gripped by an operator based on the detection signal of the grip sensor 2510, the control board 2500 transmits a control signal for operating the signal output unit 252 to the signal output unit 252.

[0334] The signal output unit 252 outputs a grip signal indicating that the handle portion 204 is gripped by an operator based on the control signal from the control board 2500. The attachment sensor 70 receives the grip signal from the signal output unit 252. The controller 13 of the power tool 1A outputs a control signal for controlling the rotation of the output shaft 6 based on the grip signal received by the attachment sensor 70.

[0335] When the operation of the operation lever 2210 is released, due to the elastic force of the elastic member 2220, the operation lever 2210 rotates so as to move outward from the internal space of the handle portion 204. The operation lever 2210 rotates so that the right end portion of the operation lever 2210 moves leftward.

[0336] The grip sensor 2510 detects the position of the right end portion of the operation lever 2210. By detecting the position of the right end portion of the operation lever 2210 that has moved leftward, the grip sensor 2510 can detect that the operation of the operation lever 2210 has been released. The detection signal of the grip sensor 2510 is transmitted to the control board 2500.

[0337] When the control board 2500 determines based on the detection signal of the grip sensor 2510 that the operation of the operation lever 2210 has been released, the control board 2500 transmits a control signal for stopping the operation of the signal output unit 252 to the signal output unit 252.

[0338] Based on the control signal from the control board 2500, the signal output unit 252 outputs a grip release signal indicating that the operation of the operation lever 2210 has been released. The attachment sensor 70 receives the grip release signal from the signal output unit 252. The controller 13 of the power tool 1A outputs a control signal for controlling the rotation of the output shaft 6 based on the grip release signal received by the attachment sensor 70.

[0339] <Effect> As described above, also in this embodiment, even when the auxiliary handle 100D is attached to the power tool 1A, if the handle portion 204 is not held by the operator, the rotation of the output shaft 6 is controlled so that the rotational load acting on the output shaft 6 does not increase.

[0340] [Tenth Embodiment] The tenth embodiment will be described. In the following description, the same reference numerals are given to the components that are the same as or equivalent to those in the above-described embodiment, and the description thereof is simplified or omitted.

[0341] <Auxiliary Handle> FIG. 29 is a perspective view showing the auxiliary handle 100F according to the present embodiment. Similar to the above-described embodiment, the auxiliary handle 100F includes a signal output unit 252 disposed at the lower end of the first arm unit 201.

[0342] In the present embodiment, a grip sensor 260 is disposed in the internal space of the handle unit 204. The grip sensor 260 is a photosensor. Further, the handle unit 204 has an opening 2171 that connects the internal space and the external space of the handle unit 204. The grip sensor 260 is disposed so as to face the opening 2171.

[0343] The grip sensor 260 detects whether or not the handle unit 204 is gripped by an operator. When the handle unit 204 is gripped by an operator, the opening 2171 is blocked. When the opening 2171 is blocked, outside light of the handle unit 204 is not input to the grip sensor 260. When the handle unit 204 is not gripped by an operator, the opening 2171 is opened. When the opening 2171 is opened, outside light of the handle unit 204 is input to the grip sensor 260. The grip sensor 260 can detect whether or not the handle unit 204 is gripped by an operator based on the presence or absence of the input of outside light.

[0344] The detection signal of the grip sensor 260 is transmitted to a control board (not shown) provided in the auxiliary handle 100F. The control board outputs a control signal to the signal output unit 252 based on the detection signal of the grip sensor 260. The signal output unit 252 can output a grip signal indicating that the handle unit 204 is gripped by an operator based on the control signal from the control board 2500. Further, the signal output unit 252 can output a grip release signal indicating that the handle unit 204 is not gripped by an operator based on the control signal from the control board 2500.

[0345] <Effect> As described above, also in the present embodiment, even when the auxiliary handle 100F is attached to the power tool 1A, if the handle portion 204 is not grasped by the operator, the rotation of the output shaft 6 is controlled so that the rotational load acting on the output shaft 6 does not increase.

[0346] [11th Embodiment] The 11th embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is simplified or omitted.

[0347] <Auxiliary Handle> FIG. 30 is a side view showing the auxiliary handle 100G according to the present embodiment. FIG. 31 is a cross-sectional view showing the auxiliary handle 100G according to the present embodiment. FIG. 32 is a cross-sectional view showing the handle portion 204 of the auxiliary handle 100G according to the present embodiment. FIG. 33 is a view of the auxiliary handle 100G according to the present embodiment as seen from the left.

[0348] The auxiliary handle 100G according to the present embodiment is a modified example of the auxiliary handle 100D described in the above-described 8th embodiment. Similar to the auxiliary handle 100D described in the above-described 8th embodiment, the auxiliary handle 100D has a first arm portion 201, a second arm portion 202, a rod portion 203, a handle portion 2040, a pipe portion 209, a tightening mechanism 210, an operating rod 220, an operating lever 223, and a second elastic member 224.

[0349] The tightening mechanism 210 has a pipe portion 211 fixed to the first arm portion 201 and a slide portion 212 that can move relative to the pipe portion 211. Regarding the point that when the handle portion 2040 is rotated by the operator, the second arm portion 202 moves in a direction approaching the first arm portion 201 or in a direction away from the first arm portion 201, it is the same as the auxiliary handle 100D described in the above-described 8th embodiment.

[0350] Further, the point that when the operating rod 220 moves rightward, the operating lever 223 rotates such that the upper end portion 223A moves rightward and the lower end portion 223B moves leftward is the same as that of the auxiliary handle 100D described in the above-described eighth embodiment. Further, the point that when the operating rod 220 moves leftward, the operating lever 223 rotates such that the upper end portion 223A moves leftward and the lower end portion 223B moves rightward due to the elastic force of the second elastic member 224 is the same as that of the auxiliary handle 100D described in the above-described eighth embodiment.

[0351] Further, the point that the control board 250 and the grip sensor 251 are arranged inside the first arm portion 201, the point that the signal output portion 252 is arranged at the lower end portion of the first arm portion 201, the point that the grip sensor 251 detects the lower end portion 223B of the operating lever 223, the point that a grip signal is output from the signal output portion 252 when the lower end portion 223B of the operating lever 223 moves leftward, and the point that a grip release signal is output from the signal output portion 252 when the lower end portion 223B of the operating lever 223 moves rightward are the same as those of the auxiliary handle 100D described in the above-described eighth embodiment.

[0352] In the above-described eighth embodiment, it is assumed that when the operation lever 221 is operated, the operating rod 220 is moved rightward. The auxiliary handle 100G according to the present embodiment does not have the operation lever 221. In the present embodiment, with the auxiliary handle 100G attached to at least a part of the power tool 1A, when the handle portion 2040 is rotated by an operator, the operating rod 220 moves rightward.

[0353] The handle portion 2040 can move in the rotational direction in a state where the gear case 5 of the power tool 1A is clamped by the first arm portion 201 and the second arm portion 202. The handle portion 2040 is rotatable with respect to the first arm portion 201 and the second arm portion 202 in a state where the gear case 5 of the power tool 1A is clamped by the first arm portion 201 and the second arm portion 202.

[0354] In this embodiment, the handle portion 2040 includes a distal handle portion 2041 and a proximal handle portion 2042. The distal handle portion 2041 is disposed on the right side (distal side) of the proximal handle portion 2042. The operator can operate to twist the handle portion 2040 with the auxiliary handle 100G attached to the power tool 1A. The handle portion 2040 can rotate by the twisting operation of the operator. When the handle portion 2040 rotates, the actuating rod 220 moves to the right.

[0355] The auxiliary handle 100E has a columnar member 230, a pipe member 231, a nut 232, a ball 233, a slide member 234, and an elastic member 235.

[0356] The columnar member 230 is fixed to the left end portion of the actuating rod 220. In this embodiment, the columnar member 230 and the actuating rod 220 are integral. A groove 236 is provided on the surface of the columnar member 230. The groove 236 is provided in a spiral shape on the surface of the columnar member 230.

[0357] The pipe member 231 is disposed around the columnar member 230. At least a part of the columnar member 230 is disposed inside the pipe member 231. The right end portion of the pipe member 231 is fixed to the distal handle portion 2041.

[0358] The nut 232 is disposed around the pipe member 231. The nut 232 is fixed to the pipe member 231.

[0359] The ball 233 is disposed in a hole 237 provided in a part of the pipe member 231. The hole 237 is provided so as to penetrate the inner surface and the outer surface of the pipe member 231. The ball 233 is held by the nut 232. The nut 232 is disposed such that the inner surface of the nut 232 faces the ball 233. A part of the ball 233 is disposed in the groove 236. The ball 233 can move in the groove 236.

[0360] The slide member 234 is fixed to the left end of the columnar member 230. As shown in FIG. 33, the slide member 234 includes an annular portion 2341 disposed around the columnar member 230 and a convex portion 2342 protruding radially outward from the annular portion 2341. The annular portion 2341 is fixed to the columnar member 230. Four convex portions 2342 are provided at intervals around the annular portion 2341. A guide groove 238 is formed on the inner surface of the proximal handle portion 2042. The guide groove 238 extends in the left-right direction. At least a part of the convex portion 2342 is disposed in the guide groove 238. The guide groove 238 guides the convex portion 2342 in the left-right direction. When the convex portion 2342 is disposed in the guide groove 238, relative rotation between the proximal handle portion 2042 and the slide member 234 is suppressed.

[0361] A circlip 240 is disposed at the left end of the slide member 234. The circlip 240 suppresses the slide member 234 from coming out of the internal space of the proximal handle portion 2042.

[0362] The elastic member 235 is disposed inside the pipe member 231. The elastic member 235 is a coil spring. The elastic member 235 is disposed so as to surround the operating rod 220. The right end of the elastic member 235 is supported by the left surface of a support portion 239 provided at the right end of the pipe member 231. The left end of the elastic member 235 is supported by the right end surface of the columnar member 230. The elastic member 235 is disposed between the left surface of the support portion 239 and the right end surface of the columnar member 230 in a compressed state.

[0363] With the gear case 5 disposed between the first arm portion 201 and the second arm portion 202, when the handle portion 2040 is rotated, the first arm portion 201 and the second arm portion 202 approach each other, and the gear case 5 is clamped between the first arm portion 201 and the second arm portion 202. After the gear case 5 is clamped between the first arm portion 201 and the second arm portion 202, when the handle portion 2040 is further twisted, the pipe member 231 rotates inside the handle portion 2040.

[0364] The ball 233 is disposed in the hole 237 of the pipe member 231. The ball 233 is held by the pipe member 231. Also, a part of the ball 233 is disposed in the groove 236 of the columnar member 230. Therefore, when the pipe member 231 rotates, the columnar member 230 is pulled by the ball 233 and moves to the right.

[0365] The convex portion 2342 of the slide member 234 is disposed in the guide groove 238. Also, the columnar member 230 and the slide member 234 are fixed. Therefore, relative rotation between the handle portion 2040, the columnar member 230, and the slide member 234 is suppressed.

[0366] When the columnar member 230 moves to the right, the slide member 234 fixed to the columnar member 230 also moves to the right. The slide member 234 moves to the right while being guided by the guide groove 238. Since the slide member 234 is guided by the guide groove 238, the columnar member 230 can move to the right without rotating.

[0367] When the columnar member 230 moves to the right, the operating rod 220 fixed to the columnar member 230 moves to the right. When the operating rod 220 moves to the right, similar to the eighth embodiment described above, the operating lever 223 rotates such that the upper end portion 223A moves to the right and the lower end portion 223B moves to the left. When the lower end portion 223B moves to the left, a grip signal is output from the signal output unit 252.

[0368] When the twisting operation of the handle portion 2040 is released, the columnar member 230 moves to the left by the elastic force of the elastic member 235. When the columnar member 230 moves to the left, the operating rod 220 moves to the left. Also, when the columnar member 230 moves to the left, the pipe member 231 is pulled by the ball 233 and rotates. When the operating rod 220 moves to the left, similar to the eighth embodiment described above, the operating lever 223 rotates such that the upper end portion 223A moves to the left and the lower end portion 223B moves to the right by the elastic force of the second elastic member 224. When the lower end portion 223B of the operating lever 223 moves to the right, a grip release signal is output from the signal output unit 252.

[0369] <Effect> As described above, according to the present embodiment, at least a part of the handle portion 2040 is twisted and operated, and the handle portion 2040 rotates, so that the operating rod 220 and the operating lever 223 move.

[0370] [12th Embodiment] The 12th embodiment will be described. In the following description, the same reference numerals are given to the components that are the same as or equivalent to those in the above-described embodiment, and the description thereof will be simplified or omitted.

[0371] <Auxiliary handle> FIG. 34 is a cross-sectional view showing the handle portion 204 of the auxiliary handle 100H according to the present embodiment.

[0372] In the present embodiment, the grip sensor 262 is disposed in the internal space of the handle portion 204. The grip sensor 262 is a pressure sensor. A convex portion 2043 is provided on the upper surface of the internal space of the handle portion 204. The convex portion 2043 projects downward from the upper surface of the internal space of the handle portion 204. The convex portion 2043 is made of rubber. The outer surface of the convex portion 2043 constitutes a part of the surface of the handle portion 204. The lower surface of the convex portion 2043 contacts the grip sensor 262.

[0373] The grip sensor 262 detects whether or not the handle portion 204 is held by an operator. When the handle portion 204 is held by an operator, a force is applied to the grip sensor 262 by the convex portion 2043. The grip sensor 262 can detect whether or not the handle portion 204 is held by an operator by detecting the force applied from the convex portion 2043.

[0374] The detection signal of the grip sensor 262 is transmitted via the lead wire 2542 to a control board (not shown) provided on the auxiliary handle 100H. Similar to the above-described embodiment, the auxiliary handle 100H includes a signal output unit 252 disposed at the lower end of the first arm portion 201. The control board outputs a control signal to the signal output unit 252 based on the detection signal of the grip sensor 262.

[0375] When the grip sensor 262 detects that the handle portion 204 is being held by the operator, the signal output unit 252 outputs a grip signal. Further, when the grip sensor 262 detects that the handle portion 204 is not being held by the operator, the signal output unit 252 outputs a grip release signal.

[0376] [Effect] As described above, also in this embodiment, even when the auxiliary handle 100H is attached to the power tool 1A, if the handle portion 204 is not being held by the operator, the rotation of the output shaft 6 is controlled so that the rotational load acting on the output shaft 6 does not increase.

[0377] [13th Embodiment] The 13th embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

[0378] FIG. 35 is a perspective view showing an auxiliary handle 100I according to this embodiment. FIG. 36 is a cross-sectional view showing a second arm portion 202 of the auxiliary handle 100I according to this embodiment.

[0379] Similar to the above-described embodiment, the auxiliary handle 100I has a connecting portion 11B that engages with the engaging portion 9 of the gear case 5. The connecting portion 11B is provided on the second arm portion 202.

[0380] In this embodiment, a grip sensor 264 is disposed on the connecting portion 11B. The grip sensor 264 is a pressure sensor.

[0381] When the output shaft 6 rotates and work is performed with the auxiliary handle 100I attached to at least a part of the power tool 1A, if the handle portion 204 is gripped by the operator, a high torque acts on the auxiliary handle 100I. Therefore, the pressure detected by the grip sensor 264 increases. On the other hand, even when the output shaft 6 rotates and work is performed, if the handle portion 204 is not gripped by the operator, the pressure detected by the grip sensor 264 does not increase. Accordingly, the grip sensor 264 can detect whether or not the handle portion 204 is gripped by the operator while the output shaft 6 is rotating.

[0382] The detection signal of the grip sensor 264 is transmitted to a control board (not shown) provided on the auxiliary handle 100I. The auxiliary handle 100I includes a signal output unit 252 disposed at the lower end of the first arm portion 201. The control board outputs a control signal to the signal output unit 252 based on the detection signal of the grip sensor 264.

[0383] The signal output unit 252 outputs a grip signal when the grip sensor 264 detects that the handle portion 204 is gripped. In the present embodiment, the controller 13 of the power tool 1A gradually increases the threshold value while the output shaft 6 is rotating based on the grip signal. The signal output unit 252 can output a grip release signal when the grip sensor 264 detects that the handle portion 204 is not gripped. The controller 13 of the power tool 1A gradually decreases the threshold value while the output shaft 6 is rotating based on the grip release signal.

[0384] <Effect> As described above, in the present embodiment, the grip sensor 264 detects whether or not the handle portion 204 is gripped by the operator after the output shaft 6 rotates and the work by the power tool 1A is started. Also in the present embodiment, even when the auxiliary handle 100I is attached to the power tool 1A, if the handle portion 204 is not gripped by the operator, the rotation of the output shaft 6 is controlled so that the rotational load acting on the output shaft 6 does not increase.

[0385] <Modification example> In the above-described embodiment, the operating lever 223 (2230) may be rotatably supported by the second arm portion 202 via a pivot.

[0386] [Other embodiments] In the above-described embodiment, the engaging portion 9 is provided in the gear case 5. The engaging portion 9 may be provided in the motor housing portion 2A. The engaging portion 9 may be provided, for example, on the side portion of the motor housing portion 2A.

[0387] In the above-described embodiment, the engaging portion 9 may be provided in front of the mode changer 17 or in front of the changer 18. That is, the engaging portion 9 may be provided in at least a part of the power tool.

[0388] In the above-described embodiment, the mode changer 17 and the changer 18 may be integrated. That is, with one ring, switching of the working mode and setting of the release value for cutting off the power transmitted to the output shaft 6 may be performed.

Explanation of reference numerals

[0389] 1A... Power tool, 1B... Power tool, 1C... Power tool, 1D... Power tool, 1E... Power tool, 1F... Power tool, 1G... Power tool, 2... Housing, 2A... Motor housing part, 2B... Grip part, 2C... Controller housing part, 3... Rear cover, 4A... Air inlet, 4B... Exhaust port, 5... Gear case, 5A... First gear case, 5B... Second gear case, 5C... Protrusion, 5D... Screw hole, 6... Output shaft, 7... Battery mounting part, 8... Motor, 9... Engagement part, 9L... Left engagement part, 9R... Right engagement part, 10... Power transmission mechanism, 11... Connecting part, 12... Battery, 12C... Release button, 13... Controller, 13A... Judgment part, 13B... Threshold setting part, 13C... Motor control part, 13D... Judgment part, 13E... Actuator control part, 13F... Judgment part, 13G... Threshold setting part, 13H... Motor control part, 13I... Judgment part, 13J... Torque range setting part, 13K... Motor control part, 13L... Judgment part, 13M... Motor control part, 13N... Judgment part, 13O... Threshold setting part, 13P... Motor control part, 13Q... Judgment part, 13R... Torque range setting part, 13S... Motor control part, 14... Trigger switch, 14A... Trigger member, 14B... Switch body, 15... Forward / reverse switching lever, 16... Speed switching lever, 17... Mode change ring, 17A... Operation ring, 17B... Cam ring, 18... Change ring, 19... Light, 20... Reduction mechanism, 21... First planetary gear mechanism, 21C... First carrier, 21P... Planetary gear, 21R... Internal gear, 21S... Pinion gear, 22... Second planetary gear mechanism, 22C... Second carrier, 22P... Planetary gear, 22R... Internal gear, 22S... Sun gear, 23... Third planetary gear mechanism, 23C... Third carrier, 23P... Planetary gear, 23R... Internal gear, 23S... Sun gear, 24... Speed switching ring, 25... Coupling ring, 30... Vibration mechanism, 31... First cam, 32... Second cam, 33... Vibration switching lever, 33A... Opposing part, 34... Coil spring, 40... Clutch mechanism, 41... Spring holder, 42... Coil spring, 43... Washer, 45... Connecting ring, 61... Spindle, 62... Chuck, 63... Bearing, 64... Bearing, 70... Mounting sensor, 71... Inverter circuit, 72... Actuator, 73... Connecting member, 74... Acceleration sensor, 75... Dial, 76... Position sensor, 77... Mounting sensor, 81... Stator, 81A... Stator core, 81B... Front insulator,81C... Rear insulator, 81D... Coil, 81E... Sensor circuit board, 81F... Connection member, 82... Rotor, 82A... Rotor shaft, 82B... Rotor core, 82C... Permanent magnet, 83... Bearing, 84... Bearing, 85... Centrifugal fan, 100A... Auxiliary handle, 100B... First auxiliary handle, 100C... Second auxiliary handle, 101... First arm part, 102... Second arm part, 103... Rod part, 103A... Small diameter part, 103B... Large diameter part, 104... Handle part, 105... Through hole, 106... Through hole, 107... Through hole, 108... Nut, 100D... Auxiliary handle, 100E... Auxiliary handle, 100F... Auxiliary handle, 100G... Auxiliary handle, 100H... Auxiliary handle, 100I... Auxiliary handle, 110... Tightening mechanism, 111... Rod part, 112... Slide part, 113... Guide part, 114... Nut, 115... Through hole, 116... Dial, 117... Permanent magnet, 118... Rod part, 118B... Large diameter part, 118C... Threaded part, 119... Handle part, 201... First arm part, 202... Second arm part, 203... Rod part, 204... Handle part, 205... Through hole, 206... Through hole, 207... Through hole, 208... Nut part, 209... Pipe part, 210... Tightening mechanism, 211... Pipe part, 212... Slide part, 214... Nut part, 215... Through hole, 216... Washer, 217... Opening, 220... Actuating rod (actuating part), 221... Operating lever (operating part), 222... First elastic member, 223... Actuating lever (actuating part), 223A... Upper end part, 223B... Lower end part, 223C... Intermediate part, 224... Second elastic member, 225... Pivot, 226... Protrusion, 227... Recess, 228... Pivot, 230... Columnar member, 231... Pipe member, 232... Nut, 233... Ball, 234... Slide member, 2341... Annular part, 2342... Protrusion, 235... Elastic member, 236... Groove, 237... Hole, 238... Guide groove, 239... Support part, 240... Circlip, 250... Control board, 251... Grip sensor, 252... Signal output part, 253... Battery, 254... Lead wire, 260... Grip sensor, 262... Grip sensor, 264... Grip sensor, 2170... Opening, 2171... Opening, 2210... Operating lever, 2211... Permanent magnet, 2250... Pivot, 2220... Elastic member, 2040... Handle part, 2041... Tip side handle part, 2042... Base side handle part, 2043... Protrusion, 2500... Control board,2510…Grip sensor, 2540…Lead wire, 2542…Lead wire, AX…Axis of rotation.,

Claims

1. A motor, a housing having a motor housing portion for housing the motor, a gear case disposed in front of the motor housing portion for housing gears, an output shaft protruding forward from the gear case and rotating by the rotational force of the motor with a tip tool attached thereto, a mounting sensor for detecting whether an auxiliary handle is mounted, a controller that, based on the detection signal of the mounting sensor, sets a threshold value related to the rotation of the output shaft to a first threshold value when it is determined that the auxiliary handle is mounted, and sets a threshold value related to the rotation of the output shaft to a second threshold value lower than the first threshold value when it is determined that the auxiliary handle is not mounted, and outputs a control signal for controlling the rotation of the output shaft based on the threshold value, the control signal includes a control signal for stopping the rotation of the motor when a value related to the rotation of the output shaft exceeds the threshold value, a permanent magnet is provided on the auxiliary handle, the mounting sensor includes a magnetic sensor for detecting the permanent magnet, a power tool.

2. The value related to the rotation is a rotational load acting on the output shaft, the threshold value is a threshold value related to the rotational load acting on the output shaft, the control signal includes a control signal for stopping the rotation of the motor when the rotational load exceeds the threshold value, the controller sets the threshold value to a first torque value when it is determined that the auxiliary handle is mounted based on the detection signal of the mounting sensor, and sets the threshold value to a second torque value lower than the first torque value when it is determined that the auxiliary handle is not mounted, The power tool according to claim 1.

3. The value related to the rotation is the acceleration of the housing, the threshold value is a threshold value related to the acceleration of the housing, the control signal includes a control signal for stopping the rotation of the motor when the acceleration exceeds the threshold value, the controller sets the threshold value to a first acceleration value when it is determined that the auxiliary handle is mounted based on the detection signal of the mounting sensor, and sets the threshold value to a second acceleration value lower than the first acceleration value when it is determined that the auxiliary handle is not mounted, The power tool according to claim 1.

4. a speed switching lever operated to switch the rotational speed of the output shaft between a high speed mode and a low speed mode, an actuator capable of operating the speed switching lever, When the controller determines based on the detection signal of the mounting sensor that the auxiliary handle is not mounted, the controller controls the actuator to enter the high-speed mode. The power tool according to claim 1.

5. When the controller determines based on the detection signal of the mounting sensor that the auxiliary handle is mounted, the controller controls the actuator to enter the low-speed mode. The power tool according to claim 4.

6. The controller can set a clutch mode in which the rotation of the motor is stopped when the rotational load acting on the output shaft reaches a release value, and can set a torque range indicating the range of the release value. Based on the detection signal of the mounting sensor, when the controller determines that the auxiliary handle is mounted, the controller sets the torque range to a first torque range; when the controller determines that the auxiliary handle is not mounted, the controller sets the torque range to a second torque range. The maximum value of the second torque range is smaller than the maximum value of the first torque range. The power tool according to claim 1.

7. A speed change lever operated to switch the rotational speed of the output shaft between a high-speed mode and a low-speed mode; A position sensor that detects the position of the speed change lever. Based on the detection signals of the mounting sensor and the position sensor, when the controller determines that the auxiliary handle is not mounted and determines that the low-speed mode is set, the controller prohibits the rotation of the motor. The power tool according to claim 1.

8. Based on the detection signals of the mounting sensor and the position sensor, when the controller determines that the auxiliary handle is not mounted and determines that the high-speed mode is set, the controller rotates the motor. The power tool according to claim 7.

9. Based on the detection signals of the mounting sensor and the position sensor, when the controller determines that the auxiliary handle is mounted, the controller rotates the motor. The power tool according to claim 7 or claim 8.

10. The auxiliary handle has a first arm portion and a second arm portion that clamps the gear case between the first arm portion. The permanent magnet is provided on at least one of the first arm portion and the second arm portion. The power tool according to claim 1.

11. The magnetic sensor is disposed at a position where the permanent magnet can face it. The power tool according to claim 10.

12. The threshold value is a threshold value related to the acceleration of the housing. The control signal includes a control signal for stopping the rotation of the motor when the acceleration exceeds the threshold value. The mounting sensor detects the length of the auxiliary handle. Based on the detection signal of the mounting sensor, when the controller determines that an auxiliary handle with a first length is mounted, the controller sets the threshold value to a first acceleration value; when it determines that an auxiliary handle with a second length shorter than the first length is mounted, the controller sets the threshold value to a second acceleration value lower than the first acceleration value; and when it determines that the auxiliary handle is not mounted, the controller sets the threshold value to a third acceleration value lower than the second acceleration value. The power tool according to claim 1.

13. The controller can set a clutch mode for stopping the rotation of the motor when the rotational load acting on the output shaft reaches a release value, and can set a torque range indicating the range of the release value. The mounting sensor detects the length of the auxiliary handle. Based on the detection signal of the mounting sensor, when the controller determines that an auxiliary handle with a first length is mounted, the controller sets the torque range to a first torque range; when it determines that an auxiliary handle with a second length shorter than the first length is mounted, the controller sets the torque range to a second torque range; and when it determines that the auxiliary handle is not mounted, the controller sets the torque range to a third torque range. The maximum value of the third torque range is smaller than the maximum value of the second torque range. The maximum value of the second torque range is smaller than the maximum value of the first torque range. The power tool according to claim 1.

14. The auxiliary handle has a threaded portion that is inserted into a threaded hole provided in the gear case. The mounting sensor detects the length of the threaded portion inserted into the threaded hole. The power tool according to claim 12 or claim 13.

15. The mounting sensor detects whether the auxiliary handle is mounted and at least a part of the auxiliary handle is gripped. Based on the detection signal of the mounting sensor, the controller outputs the control signal. The power tool according to claim 10.

16. The auxiliary handle includes a handle portion, a grip sensor that detects whether the handle portion is gripped in a state where the gear case is clamped by the first arm portion and the second arm portion, and a signal output portion that outputs a grip signal indicating that the handle portion is gripped based on a detection signal of the grip sensor. The mounting sensor detects whether at least a part of the auxiliary handle is gripped based on the grip signal. The power tool according to claim 15.

17. A first arm portion; A second arm portion that clamps at least a part of the power tool between the second arm portion and the first arm portion; A handle portion; A grip sensor that detects whether the handle portion is gripped in a state where at least a part of the power tool is clamped by the first arm portion and the second arm portion; A signal output portion that outputs a grip signal indicating that the handle portion is gripped or a grip release signal indicating that the handle portion is not gripped to the power tool based on a detection signal of the grip sensor. The power tool includes a motor, an output shaft that rotates by a rotational force of the motor with a tip tool attached thereto, a mounting sensor that receives a grip signal or a grip release signal from the signal output portion in a state where at least a part of the power tool is clamped by the first arm portion and the second arm portion, and a controller that sets a threshold value related to the rotation of the output shaft to a first threshold value when the grip signal is received and sets a threshold value related to the rotation of the output shaft to a second threshold value lower than the first threshold value when the grip release signal is received, and outputs a control signal for controlling the rotation of the output shaft based on the threshold value. The control signal includes a control signal for stopping the rotation of the motor when a value related to the rotation of the output shaft exceeds the threshold value. Auxiliary handle.

18. The signal output portion is disposed on at least one of the first arm portion and the second arm portion. The auxiliary handle according to claim 17.

19. An operation portion that moves when the handle portion is gripped in a state where at least a part of the power tool is clamped by the first arm portion and the second arm portion; An operating portion that moves by the movement of the operation portion. The grip sensor detects the movement of the operating part and detects whether the handle part is gripped. The auxiliary handle according to claim 17 or claim 18.

20. The grip sensor and the operating part are arranged on at least one of the first arm part and the second arm part. The auxiliary handle according to claim 19.

21. When at least a part of the power tool is clamped by the first arm part and the second arm part, an operating part that moves when the handle part is gripped is provided. The grip sensor detects the movement of the operating part and detects whether the handle part is gripped. The auxiliary handle according to claim 17 or claim 18.

22. The operating part includes an operating lever that is rotatably supported by the handle part via a first pivot. The auxiliary handle according to any one of claims 19 to 21.

23. The handle part is rotatable with respect to the first arm part and the second arm part. The operating part includes the handle part. The auxiliary handle according to any one of claims 19 to 21.

24. The grip sensor is arranged on the handle part. The auxiliary handle according to any one of claims 17 to 23.

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