Electric work machine

Abstract

To restrict an increase in the number of lead wires.SOLUTION: An electric work machine includes: an operating unit configured to operate in each of a plurality of operating modes; an operating member configured to be moved so as to switch each operating mode; a plurality of mode sensors arranged in a moving direction of the operating member and configured to detect the operating member; a mode sensor substrate on which a mode sensor is mounted and which has an output terminal connected to the mode sensor; and a controller substrate connected to an output terminal via an output lead wire and configured to determine each operating mode, based on an output signal output from the output terminal. The number of the operating modes is at least three. The number of mode sensors is equal to or smaller than the number of operating modes.SELECTED DRAWING: Figure 23

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to an electric power tool and a driver drill. [Background technology]

[0002] In the technical field of electric power tools, an electronic clutch driver drill, such as that disclosed in Patent Document 1, is known. The driver drill disclosed in Patent Document 1 includes a motor, an output shaft rotated by the motor, and a speed change mechanism disposed between the motor and the output shaft. By operating a speed selector lever, the speed change mechanism switches between a high-speed mode in which the output shaft rotates at a high speed and a low-speed mode in which the output shaft rotates at a low speed. In the electronic clutch driver drill, a controller estimates the output torque of the output shaft. The controller stops the rotation of the motor when the estimated output torque becomes equal to or exceeds a preset clutch actuation torque. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-024043 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the driver drill has a sensor that detects whether the drill is in high-speed mode or low-speed mode. The sensor's detection signal is transmitted to a controller via lead wires. If the number of lead wires increases, the internal space of the housing of the driver drill may become constricted or the assembly of the driver drill may become difficult.

[0005] The technology disclosed in this specification aims to suppress an increase in the number of lead wires. [Means for solving the problem]

[0006] This specification discloses an electric working machine. The electric working machine may include an operating unit that operates in each of a plurality of operating modes, an operating member that moves to switch the operating mode, a plurality of mode sensors that are arranged in the moving direction of the operating member and detect the operating member, a mode sensor board that is equipped with the mode sensors and has output terminals connected to the mode sensors, and a controller board that is connected to the output terminals via output lead wires and determines the operating mode based on the output signal output from the output terminal. The number of operating modes may be at least three. The number of mode sensors may be equal to or less than the number of operating modes. [Effects of the Invention]

[0007] According to the technology disclosed in this specification, an increase in the number of lead wires is suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front perspective view showing a driver drill according to a first embodiment. [Figure 2] FIG. 2 is a rear perspective view showing the driver drill according to the first embodiment. [Figure 3] FIG. 3 is a side view showing the driver drill according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the driver drill according to the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view showing a part of the driver drill according to the first embodiment. [Figure 6] FIG. 6 is a front perspective view showing a part of the driver drill according to the first embodiment. [Figure 7] FIG. 7 is a front view showing a part of the driver drill according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing the reduction mechanism according to the first embodiment. [Figure 12] FIG. 12 is a perspective view showing the reduction mechanism according to the first embodiment, seen from the front right. [Figure 13] FIG. 13 is a perspective view showing the reduction mechanism according to the first embodiment, seen from the front left. [Figure 14] FIG. 14 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 15] FIG. 15 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 16] FIG. 16 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 17] FIG. 17 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 18] FIG. 18 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 19] FIG. 19 is a cross-sectional view showing the power transmission mechanism according to the first embodiment. [Figure 20] FIG. 20 is a diagram schematically showing the mode sensor substrate according to the first embodiment. [Figure 21] FIG. 21 is a block diagram showing a control system of the driver drill according to the first embodiment. [Figure 22] FIG. 22 is a diagram showing an example of correlation data stored in the correlation data storage circuit according to the first embodiment. [Figure 23] FIG. 23 is a diagram showing a speed mode detection circuit according to the first embodiment. [Figure 24] FIG. 24 is a diagram for explaining the position of the speed switching lever relative to the mode sensor board according to the first embodiment. [Figure 25] FIG. 25 is a diagram for explaining the relationship between the position of the speed change lever, the state of the mode sensor, and the output signal output from the output terminal according to the first embodiment. [Figure 26]FIG. 26 is a diagram showing a speed mode detection circuit according to the second embodiment. [Figure 27] FIG. 27 is a diagram for explaining the relationship between the position of the speed change lever, the state of the mode sensor, and the output signal output from the output terminal according to the second embodiment. [Figure 28] FIG. 28 is a diagram showing a part of the speed mode detection circuit when the speed selector lever according to the second embodiment is placed in the third position. [Figure 29] FIG. 29 is a diagram showing a speed mode detection circuit according to the third embodiment. [Figure 30] FIG. 30 is a diagram for explaining the position of the speed switching lever relative to the mode sensor board according to the third embodiment. [Figure 31] FIG. 31 is a diagram for explaining the relationship between the position of the speed change lever, the state of the mode sensor, and the output signal output from the output terminal according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, an electric operating machine may include an operating unit that operates in each of a plurality of operating modes, an operating member that is moved to switch the operating mode, a plurality of mode sensors that are arranged in the moving direction of the operating member and detect the operating member, a mode sensor board that is equipped with the mode sensors and has output terminals connected to the mode sensors, and a controller board that is connected to the output terminals via output lead wires and that determines the operating mode based on the output signal output from the output terminal. The number of operating modes may be at least three. The number of mode sensors may be equal to or less than the number of operating modes.

[0010] The above configuration suppresses an increase in the number of output lead wires. When the electric work machine includes a motor, an output unit to which a tool bit is attached, and a speed reduction mechanism that rotates the output unit at a lower rotational speed than the motor, the operating unit is exemplified as the speed reduction mechanism. The operating mode is exemplified as the speed mode of the speed reduction mechanism. The operating member is exemplified as a speed switch lever that is moved to switch the speed mode of the speed reduction mechanism between high-speed mode, medium-speed mode, and low-speed mode. The output terminals of the mode sensor board and the controller board are connected via output lead wires. The controller board determines the speed mode of the speed reduction mechanism based on the output signal output from the output terminal. There are three speed modes: high-speed mode, medium-speed mode, and low-speed mode. When the number of mode sensors is less than three, the number of output terminals can be three or less. By suppressing an increase in the number of output terminals, an increase in the number of output lead wires connecting the output terminals and the controller board is suppressed.

[0011] In one or more embodiments, the number of mode sensors may be the number of operating modes minus one.

[0012] In the above configuration, when the number of operation modes is three, the number of mode sensors is two, so that the number of output leads is at most two.

[0013] In one or more embodiments, the output terminals may be connected one to each of a plurality of mode sensors.

[0014] In the above configuration, the output signal from one mode sensor is sent to the controller board via one output terminal and one output lead wire.

[0015] In one or more embodiments, the mode sensor substrate may have input terminals connected to the mode sensor, and a voltage may be applied to the mode sensor via the input terminals.

[0016] In the above configuration, the mode sensor can be driven and output an output signal by a voltage applied via the input terminal.

[0017] In one or more embodiments, the multiple mode sensors may be connected in parallel with each other, and each of the multiple mode sensors may be connected to the input terminal via a power line.

[0018] In the above configuration, an increase in the number of input terminals is suppressed.

[0019] In one or more embodiments, there may be one input terminal.

[0020] In the above configuration, an increase in the number of input terminals is suppressed.

[0021] In one or more embodiments, the operating member may hold a permanent magnet. The mode sensor may include a Hall sensor that detects the permanent magnet. Each of the mode sensors may have a power port to which current is supplied, a ground port connected to the input terminal via a resistor, and a ground port connected to ground.

[0022] In the above configuration, the mode sensor can detect the position of the operating member by detecting the magnetic field of the permanent magnet held by the operating member.

[0023] In one or more embodiments, the mode sensor may include a first mode sensor and a second mode sensor. The output terminal may include a first output terminal connected to the first mode sensor and a second output terminal connected to the second mode sensor. The resistor may include a first resistor connected to the first mode sensor and a second resistor connected to the second mode sensor. When the operating member is placed in a first position to switch to the first operating mode, an output signal of a first level may be output from the first output terminal and an output signal of a second level may be output from the second output terminal. When the operating member is placed in a second position to switch to the second operating mode, an output signal of a second level may be output from the first output terminal and an output signal of a second level may be output from the second output terminal. When the operating member is placed in a third position to switch to a third operating mode, an output signal of a second level may be output from the first output terminal and an output signal of the first level may be output from the second output terminal.

[0024] In the above configuration, the combination of the level of the output signal output from the first output terminal and the level of the output signal output from the second output terminal changes based on the position of the operating member, so that the controller board can determine the operating mode of the operating unit, which changes based on the position of the operating member.

[0025] In one or more embodiments, the multiple mode sensors may be connected in parallel with each other, and each of the multiple mode sensors may be connected to an output terminal via a signal line.

[0026] In the above configuration, an increase in the number of output terminals is suppressed.

[0027] In one or more embodiments, the electric operating machine may include an operating unit that operates in each of a plurality of operating modes, an operating member that is moved to switch the operating mode, a plurality of mode sensors that are arranged in the moving direction of the operating member and detect the operating member, a mode sensor board that has the mode sensors mounted thereon and output terminals connected to the mode sensors, and a controller board that is connected to the output terminals via output lead wires and that determines the operating mode based on the output signals output from the output terminals. The plurality of mode sensors may be connected in parallel with each other. Each of the plurality of mode sensors may be connected to the output terminal via a signal line.

[0028] The above configuration suppresses an increase in the number of output lead wires. When the electric work machine includes a motor, an output unit to which a tool bit is attached, and a speed reduction mechanism that rotates the output unit at a lower rotational speed than the motor, the operating unit is exemplified as the speed reduction mechanism. The operating mode is exemplified as the speed mode of the speed reduction mechanism. The operating member is exemplified as a speed switch lever that is moved to switch the speed mode of the speed reduction mechanism between high-speed mode, medium-speed mode, and low-speed mode. The output terminals of the mode sensor board and the controller board are connected via output lead wires. The controller board determines the speed mode of the speed reduction mechanism based on an output signal output from the output terminals. By connecting multiple mode sensors connected in parallel to each other to the output terminals, an increase in the number of output terminals is suppressed. By suppressing an increase in the number of output terminals, an increase in the number of output lead wires connecting the output terminals and the controller board is suppressed.

[0029] In one or more embodiments, there may be one output terminal.

[0030] In the above configuration, an increase in the number of output terminals is suppressed.

[0031] In one or more embodiments, the mode sensor substrate may have input terminals connected to the mode sensor, and a voltage may be applied to the mode sensor via the input terminals.

[0032] In the above configuration, the mode sensor can be driven and output an output signal by a voltage applied via the input terminal.

[0033] In one or more embodiments, each of the multiple mode sensors may be connected to the input terminal via a power line.

[0034] In the above configuration, an increase in the number of input terminals is suppressed.

[0035] In one or more embodiments, there may be one input terminal.

[0036] In the above configuration, an increase in the number of input terminals is suppressed.

[0037] In one or more embodiments, the operating member may hold a permanent magnet. The mode sensor may include a Hall sensor that detects the permanent magnet. Each of the mode sensors may have a power port to which current is supplied, a ground port connected to the input terminal via a resistor, and a ground port connected to ground.

[0038] In the above configuration, the mode sensor can detect the position of the operating member by detecting the magnetic field of the permanent magnet held by the operating member.

[0039] In one or more embodiments, the mode sensor may include a first mode sensor and a second mode sensor. The resistor may include a first resistor connected to the first mode sensor and a second resistor connected to the second mode sensor. When the operating member is placed in a first position to switch to the first operating mode, an output signal of a first level may be output from the output terminal. When the operating member is placed in a second position to switch to the second operating mode, an output signal of a second level may be output from the output terminal. When the operating member is placed in a third position to switch to a third operating mode, an output signal of a voltage divided by the resistance value of the first resistor and the resistance value of the second resistor may be output from the output terminal.

[0040] In the above configuration, the level of the output signal output from the output terminal changes based on the position of the operating member, so the controller board can determine the operating mode of the operating part, which changes based on the position of the operating member.

[0041] In one or more embodiments, the mode sensor may be in an ON state where the ground port is connected to the ground port when it detects a permanent magnet, and in an OFF state where the ground port is not connected to the ground port when it does not detect a permanent magnet.

[0042] In the above configuration, the mode sensor is turned ON when a permanent magnet is detected, and turned OFF when a permanent magnet is not detected, so the mode sensor can detect the position of the permanent magnet.

[0043] In one or more embodiments, the first position may be defined rearward of the second position. The second position may be defined rearward of the third position. The first mode sensor may be positioned to detect the permanent magnet when the operating member is disposed in the first position, and not to detect the permanent magnet when the operating member is disposed in the second and third positions. The second mode sensor may be positioned to detect the permanent magnet when the operating member is disposed in the third position, and not to detect the permanent magnet when the operating member is disposed in the first and second positions.

[0044] In the above configuration, the level of the output signal output from the output terminal changes based on the position of the permanent magnet.

[0045] In one or more embodiments, the driver drill may include a motor. The driver drill may include a first planetary gear mechanism having a first stage including a plurality of first planetary gears arranged around a sun gear rotated by the motor and a first internal gear arranged around the plurality of first planetary gears, and a second stage including a plurality of second planetary gears arranged around the sun gear and a second internal gear arranged around the plurality of second planetary gears, the second stage having a different reduction ratio from the first stage. The driver drill may include a second planetary gear mechanism arranged forward of the first planetary gear mechanism and actuated by the rotational force of the first planetary gear mechanism. The driver drill may include a spindle rotated by the rotational force of the motor transmitted via the second planetary gear mechanism. The driver drill may include a housing having a motor accommodating portion for accommodating the motor. The driver drill may include a first speed change mechanism that switches between a first deceleration mode in which rotation of the second internal gear is prevented and rotation of the first internal gear is allowed, and a second deceleration mode in which rotation of the first internal gear is prevented and rotation of the second internal gear is allowed. The driver drill may include a second speed change mechanism that switches between an enabled mode in which rotation of the internal gear of the second planetary gear mechanism is prevented and a disabled mode in which rotation of the internal gear is allowed. The driver drill may include an operating member that is movable among a first position, a second position, and a third position with respect to the motor housing, and two mode sensors that detect the position of the operating member. When the operating member is located in the first position, the first planetary gear mechanism may be set to the second deceleration mode, and the second planetary gear mechanism may be set to the disabled mode. When the operating member is located in the second position, the first planetary gear mechanism may be set to the first deceleration mode, and the second planetary gear mechanism may be set to the disabled mode. When the operating member is placed in the third position, the first planetary gear mechanism may be set to the first reduction mode, and the second planetary gear mechanism may be set to the effective mode.

[0046] In the above configuration, when the operating member is located at the first position, the reduction mechanism including the first planetary gear mechanism and the second planetary gear mechanism is set to the high-speed mode. When the operating member is located at the second position, the reduction mechanism including the first planetary gear mechanism and the second planetary gear mechanism is set to the medium-speed mode. When the operating member is located at the third position, the reduction mechanism including the first planetary gear mechanism and the second planetary gear mechanism is set to the low-speed mode. The two mode sensors determine whether the reduction mechanism is set to the high-speed mode, the medium-speed mode, or the low-speed mode. There are three speed modes. Since there are two mode sensors, an increase in the number of output lead wires connected to the mode sensors is suppressed.

[0047] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0048] In the embodiments, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the center of the electric operating machine.

[0049] The electric work machine has a motor. In the embodiments, a direction parallel to a rotation axis AX of the motor will be referred to as an axial direction, a direction circumferentially around the rotation axis AX will be referred to as a circumferential direction or a rotation direction, and a direction radial from the rotation axis AX will be referred to as a radial direction.

[0050] In this embodiment, the rotation axis AX extends in the front-to-rear direction. The axial direction and the front-to-rear direction coincide with each other. One axial side is the front, and the other axial side is the rear. In addition, in the radial direction, a position closer to or approaching the rotation axis AX will be referred to as the radially inner side, and a position farther from or away from the rotation axis AX will be referred to as the radially outer side.

[0051] [First embodiment] A first embodiment will be described below. In this embodiment, the electric working machine is a driver drill, which is a type of drilling or screw driving machine.

[0052] <Driver Drill Overview> FIG. 1 is a front perspective view of the driver drill 1 according to this embodiment. FIG. 2 is a rear perspective view of the driver drill 1 according to this embodiment. FIG. 3 is a side view of the driver drill 1 according to this embodiment. FIG. 4 is a cross-sectional view of the driver drill 1 according to this embodiment. In this embodiment, the driver drill 1 is a vibration driver drill.

[0053] As shown in Figures 1, 2, 3, and 4, the driver drill 1 includes a housing 2, a rear cover 3, a casing 4, a battery mounting section 5, a motor 6, a power transmission mechanism 7, an output section 8, a fan 9, a trigger lever 10, a forward / reverse rotation switch lever 11, a speed switch lever 12, a mode switch ring 13, a light 14, an interface panel 15, a dial 16, a controller board 17, a rotation sensor board 90, and a mode sensor board 100.

[0054] The housing 2 is made of synthetic resin. In this embodiment, the housing 2 is made of nylon. The housing 2 includes a left housing 2L and a right housing 2R. The left housing 2L and the right housing 2R are fixed together with screws 2S. The housing 2 is formed by fixing the left housing 2L and the right housing 2R together.

[0055] The housing 2 has a motor accommodating portion 21, a grip portion 22, and a battery holding portion 23.

[0056] The motor accommodating portion 21 accommodates the motor 6. The motor accommodating portion 21 is cylindrical.

[0057] The grip portion 22 is held by an operator. The grip portion 22 is disposed below the motor housing portion 21. The grip portion 22 extends downward from the motor housing portion 21. The trigger lever 10 is disposed in front of the grip portion 22.

[0058] The battery holding portion 23 houses the controller board 17. The battery holding portion 23 is disposed below the grip portion 22. The battery holding portion 23 is connected to the lower end of the grip portion 22. The external dimensions of the battery holding portion 23 are larger than the external dimensions of the grip portion 22 in both the front-rear and left-right directions.

[0059] The rear cover 3 is made of synthetic resin. In this embodiment, the rear cover 3 is made of nylon. The rear cover 3 is disposed behind the motor housing portion 21. The rear cover 3 houses the fan 9. The rear cover 3 is disposed so as to cover the opening at the rear of the motor housing portion 21. The rear cover 3 is fixed to the motor housing portion 21 with four screws 3S.

[0060] The motor accommodating section 21 has an intake port 18. The rear cover 3 has an exhaust port 19. Air from the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 18. Air from the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 19.

[0061] The casing 4 houses the power transmission mechanism 7. The casing 4 includes a first casing 4A, a second casing 4B, a bracket plate 4C, and a stop plate 4D. The second casing 4B is disposed in front of the first casing 4A. The mode switching ring 13 is disposed in front of the second casing 4B. The first casing 4A is made of synthetic resin. The second casing 4B is made of metal. In this embodiment, the second casing 4B is made of aluminum. The casing 4 is disposed in front of the motor accommodating section 21. Each of the first casing 4A and the second casing 4B is cylindrical.

[0062] The first casing 4A is fixed to the rear end of the second casing 4B. The bracket plate 4C is arranged to cover the opening at the rear end of the first casing 4A. The bracket plate 4C is fixed to the rear end of the first casing 4A with screws 4E. The stop plate 4D is arranged to cover the opening at the front end of the second casing 4B. The stop plate 4D is fixed to the front end of the second casing 4B with screws 4F.

[0063] The casing 4 is disposed so as to cover the front opening of the motor accommodating portion 21. The first casing 4A is disposed inside the motor accommodating portion 21. The second casing 4B is fixed to the motor accommodating portion 21 with four screws 4S.

[0064] The battery attachment section 5 is formed below the battery holding section 23. The battery attachment section 5 is connected to the battery pack 20. The battery pack 20 is attached to the battery attachment section 5. The battery pack 20 is detachable from the battery attachment section 5. The battery pack 20 includes a secondary battery. In this embodiment, the battery pack 20 includes a rechargeable lithium-ion battery. When attached to the battery attachment section 5, the battery pack 20 can supply power to the driver drill 1. The motor 6 is driven based on the power supplied from the battery pack 20. The interface panel 15 and the controller board 17 operate based on the power supplied from the battery pack 20.

[0065] The motor 6 is a power source for the driver drill 1. The motor 6 is an inner rotor type brushless motor. The motor 6 is housed in the motor housing 21. The motor 6 has a cylindrical stator 61 and a rotor 62 disposed inside the stator 61. The rotor 62 rotates relative to the stator 61. The rotor 62 includes a rotor shaft 63 extending in the axial direction (front-rear direction).

[0066] The power transmission mechanism 7 is disposed in front of the motor 6. The power transmission mechanism 7 is housed in the casing 4. The power transmission mechanism 7 connects the rotor shaft 63 and the output unit 8. The power transmission mechanism 7 transmits the power generated by the motor 6 to the output unit 8. The power transmission mechanism 7 has a plurality of gears.

[0067] The power transmission mechanism 7 includes a speed reduction mechanism 30 and a vibration mechanism 40 .

[0068] The reduction mechanism 30 reduces the rotation speed of the rotor shaft 63 and rotates the output section 8 at a lower rotational speed than the rotor shaft 63. In this embodiment, the reduction mechanism 30 has a first planetary gear mechanism 31, a second planetary gear mechanism 32, and a third planetary gear mechanism 33. At least a portion of the first planetary gear mechanism 31 is disposed forward of the motor 6. The second planetary gear mechanism 32 is disposed forward of the first planetary gear mechanism 31. The third planetary gear mechanism 33 is disposed forward of the second planetary gear mechanism 32. The first planetary gear mechanism 31 is operated by the rotational force of the motor 6. The second planetary gear mechanism 32 is operated by the rotational force of the first planetary gear mechanism 31. The third planetary gear mechanism 33 is operated by the rotational force of the second planetary gear mechanism 32.

[0069] The vibration mechanism 40 vibrates the output portion 8 in the axial direction. The vibration mechanism 40 has a first cam 41, a second cam 42, and a vibration switching ring 43.

[0070] The output unit 8 is disposed forward of the motor 6. The output unit 8 rotates due to the rotational force of the motor 6. The output unit 8 rotates with a tool bit attached based on the rotational force transmitted from the motor 6 via the power transmission mechanism 7. The output unit 8 includes a spindle 81 that rotates about a rotation axis AX based on the rotational force transmitted from the motor 6, and a chuck 82 to which the tool bit is attached. At least a portion of the spindle 81 is disposed forward of the third planetary gear mechanism 33. The spindle 81 is coupled to the third planetary gear mechanism 33. The spindle 81 rotates due to the rotational force of the motor 6 transmitted via the first planetary gear mechanism 31, the second planetary gear mechanism 32, and the third planetary gear mechanism 33. A tool bit such as a driver bit or a drill bit is detachably attached to the chuck 82.

[0071] The fan 9 is disposed behind the rotor core 62A, which will be described later. The fan 9 generates an airflow for cooling the motor 6. The fan 9 is fixed to at least a portion of the rotor 62. The fan 9 is fixed to the rear of the rotor shaft 63. The fan 9 rotates with the rotation of the rotor shaft 63. As the rotor shaft 63 rotates, the fan 9 rotates together with the rotor shaft 63. As the fan 9 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake 18. The air that has flowed into the internal space of the housing 2 cools the motor 6 by circulating through the internal space of the housing 2. The air that has circulated through the internal space of the housing 2 flows out into the external space of the housing 2 through the air exhaust 19.

[0072] The trigger lever 10 is operated to start the motor 6. The trigger lever 10 is provided at the upper front part of the grip part 22. The front end part of the trigger lever 10 protrudes forward from the front part of the grip part 22. The trigger lever 10 is movable in the front and rear directions. The trigger lever 10 is operated by the operator. When the trigger lever 10 is operated so as to move backward, the motor 6 starts. When the operation of the trigger lever 10 is released, the motor 6 stops.

[0073] The forward / reverse switching lever 11 is operated to switch the rotation direction of the motor 6. The forward / reverse switching lever 11 is provided on the upper part of the grip portion 22. The left end of the forward / reverse switching lever 11 protrudes leftward from the left part of the grip portion 22. The right end of the forward / reverse switching lever 11 protrudes rightward from the right part of the grip portion 22. The forward / reverse switching lever 11 can move left and right. The forward / reverse switching lever 11 is operated by the operator. When the forward / reverse switching lever 11 is operated to move leftward, the motor 6 rotates in the forward direction. When the forward / reverse switching lever 11 is operated to move rightward, the motor 6 rotates in the reverse direction. When the rotation direction of the motor 6 is switched, the rotation direction of the spindle 81 is switched.

[0074] The speed switch lever 12 is operated to change the speed mode of the reduction mechanism 30. The speed switch lever 12 is provided on top of the motor housing 21. The speed switch lever 12 is movable in the front-to-rear direction relative to the motor housing 21. The speed switch lever 12 is operated by an operator. The speed modes of the reduction mechanism 30 include a high-speed mode, a medium-speed mode, and a low-speed mode. The high-speed mode is a speed mode in which the output unit 8 rotates at a high speed. The medium-speed mode is a speed mode in which the output unit 8 rotates at a medium speed. The low-speed mode is a speed mode in which the output unit 8 rotates at a low speed. The movable range of the speed switch lever 12 is defined in the front-to-rear direction. When the speed switch lever 12 is operated to move to a first position P1 at the rear of the movable range, the speed mode of the reduction mechanism 30 is set to the high-speed mode. When the speed switch lever 12 is operated to move to the second position P2 in the middle of the movable range, the speed mode of the reduction mechanism 30 is set to the medium speed mode. When the speed switch lever 12 is operated to move to the third position P3 in the front of the movable range, the speed mode of the reduction mechanism 30 is set to the low speed mode (see FIG. 20).

[0075] The mode switching ring 13 is operated to change the operation mode of the vibration mechanism 40. The mode switching ring 13 is disposed in front of the casing 4. The mode switching ring 13 is rotatable. The mode switching ring 13 is operated by an operator. The operation modes of the vibration mechanism 40 include a vibration mode and a non-vibration mode. The vibration mode is an operation mode in which the output unit 8 is vibrated in the axial direction. The non-vibration mode is an operation mode in which the output unit 8 is not vibrated in the axial direction. When the mode switching ring 13 is operated to be positioned at the vibration mode position in the rotational direction, the operation mode of the vibration mechanism 40 is set to the vibration mode. When the mode switching ring 13 is operated to be positioned at the non-vibration mode position in the rotational direction, the operation mode of the vibration mechanism 40 is set to the non-vibration mode. The non-vibration modes include a driver mode (screw tightening mode) and a drill mode.

[0076] As shown in FIG. 6 , a first symbol 13A, a second symbol 13B, and a third symbol 13C are provided on the mode switching ring 13. A reference symbol 4R is provided on the front of the top of the casing 4. When the mode switching ring 13 is rotated so that the first symbol 13A coincides with the reference symbol 4R, the vibration mechanism 40 is set to vibration mode (vibration drill mode). When the mode switching ring 13 is rotated so that the second symbol 13B coincides with the reference symbol 4R, the vibration mechanism 40 is set to the driver mode of the non-vibration modes. When the mode switching ring 13 is rotated so that the third symbol 13C coincides with the reference symbol 4R, the vibration mechanism 40 is set to the drill mode of the non-vibration modes.

[0077] The light 14 emits illumination light that illuminates the area in front of the driver drill 1. The light 14 includes, for example, a light-emitting diode (LED). The light 14 is disposed below the front part of the motor housing portion 21. The light 14 is disposed above the trigger lever 10.

[0078] The interface panel 15 is provided on the upper surface of the battery holding portion 23. The interface panel 15 includes an operating device 24 and a display device 25. The interface panel 15 is plate-shaped. The operating device 24 includes operation buttons. Examples of the display device 25 include a segment display including a plurality of segment light emitters, a flat panel display such as a liquid crystal display, and an indicator-type display in which a plurality of light-emitting diodes are arranged.

[0079] A panel opening 27 is formed in the battery holding portion 23. The panel opening 27 is formed in the upper surface of the battery holding portion 23, forward of the grip portion 22. At least a portion of the interface panel 15 is disposed in the panel opening 27.

[0080] The operating device 24 is operated to change the drive mode of the motor 6. The operating device 24 is operated by an operator. The drive modes of the motor 6 include a drill mode and a clutch mode. The drill mode is a drive mode in which the motor 6 is driven regardless of the torque acting on the motor 6 when the motor 6 is driven. The clutch mode is a drive mode in which the motor 6 is stopped when the torque acting on the motor 6 exceeds a torque threshold when the motor 6 is driven.

[0081] The dial 16 is operated to change the driving conditions of the motor 6. The dial 16 is disposed in front of the battery holding portion 23. The dial 16 is rotatably supported by the battery holding portion 23. The dial 16 is rotatable 360° or more. The dial 16 is operated by an operator. The driving conditions of the motor 6 include a torque threshold. The dial 16 is operated to change the torque threshold in the clutch mode set by the operating device 24.

[0082] A dial opening is formed in the battery holding portion 23. The dial opening is formed on the right side of the front portion of the battery holding portion 23. At least a portion of the dial 16 is disposed in the dial opening .

[0083] The controller board 17 outputs a control command to control the motor 6. At least a portion of the controller board 17 is housed in the controller case 26. The controller board 17 is housed in the battery holding section 23 while being held in the controller case 26. The controller board 17 includes a circuit board on which a plurality of electronic components are mounted. Examples of electronic components mounted on the circuit board include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or storage, a volatile memory such as a RAM (Random Access Memory), a transistor, a capacitor, and a resistor.

[0084] The controller board 17 sets the driving conditions of the motor 6 based on the operation of the dial 16. As described above, the driving conditions of the motor 6 include a torque threshold. In the clutch mode, the controller board 17 sets the torque threshold based on the operation of the dial 16.

[0085] Furthermore, in the clutch mode, the controller board 17 stops the motor 6 when the torque acting on the motor 6 during driving of the motor 6 exceeds a set torque threshold.

[0086] Furthermore, the controller board 17 causes the display device 25 to display the set driving conditions of the motor 6. The controller board 17 causes the display device 25 to display the set torque threshold value.

[0087] The rotation sensor board 90 includes a circuit board on which a plurality of rotation sensors are mounted to detect the rotation of the rotor 62. The controller board 17 supplies a drive current to the motor 6 based on the detection data of the rotation sensors.

[0088] The mode sensor board 100 includes a circuit board on which a plurality of mode sensors are mounted that detect the longitudinal position of the speed selector lever 12. Based on the detection data of the mode sensors, the controller board 17 stops the motor 6 in the clutch mode when the torque acting on the motor 6 during driving of the motor 6 exceeds a set torque threshold.

[0089] <Motor and power transmission mechanism> Fig. 5 is a cross-sectional view showing a portion of the driver drill 1 according to this embodiment. As shown in Fig. 5, the motor 6 has a cylindrical stator 61 and a rotor 62 disposed inside the stator 61. The rotor 62 includes a rotor shaft 63 extending in the axial direction.

[0090] The stator 61 includes a stator core 61A including a plurality of stacked steel plates, a front insulator 61B disposed in front of the stator core 61A, a rear insulator 61C disposed in the rear of the stator core 61A, a plurality of coils 61D wound around the stator core 61A via the front insulator 61B and the rear insulator 61C, and a short-circuit member 61E supported by the front insulator 61B. The short-circuit member 61E connects the plurality of coils 61D via fusing terminals. The short-circuit member 61E is connected to the controller board 17 via lead wires.

[0091] The rotor 62 rotates about a rotation axis AX. The rotor 62 has a rotor shaft 63, a rotor core 62A arranged around the rotor shaft 63, and a plurality of permanent magnets 62B held by the rotor core 62A. The rotor core 62A is cylindrical. The rotor core 62A includes a plurality of laminated steel plates. The rotor core 62A has through holes extending in the axial direction. A plurality of through holes are formed in the circumferential direction. The permanent magnets 62B are arranged in each of the plurality of through holes of the rotor core 62A.

[0092] The rotation sensor board 90 includes a circuit board on which multiple rotation sensors that detect the rotation of the rotor 62 are mounted. The rotation sensor board 90 is attached to the front insulator 61B. The rotation sensors mounted on the rotation sensor board 90 include magnetic sensors that detect the magnetic field of the permanent magnet 62B. An example of the magnetic sensor is a Hall sensor that includes a Hall element. The rotation sensor detects the rotation of the rotor 62 by detecting the magnetic field of the permanent magnet 62B. The controller board 17 supplies a drive current to the coil 61D based on the detection data of the rotation sensors.

[0093] The rotor shaft 63 rotates around a rotation axis AX. The rotation axis AX of the rotor shaft 63 coincides with the rotation axis of the output section 8. A front portion of the rotor shaft 63 is rotatably supported by a bearing 64. A rear portion of the rotor shaft 63 is rotatably supported by a bearing 65. The bearing 64 is held by a bracket plate 4C arranged in front of the stator 61. The bearing 65 is held by the rear cover 3. The front end portion of the rotor shaft 63 is arranged forward of the bearing 64. The front end portion of the rotor shaft 63 is arranged in the internal space of the casing 4.

[0094] A pinion gear 31S is provided at the front end of the rotor shaft 63. The pinion gear 31S functions as a sun gear of the first planetary gear mechanism 31. The pinion gear 31S is rotated by the motor 6. The pinion gear 31S includes a large diameter portion 311S and a small diameter portion 312S disposed forward of the large diameter portion 311S. The rotor shaft 63 is connected to the first planetary gear mechanism 31 of the reduction mechanism 30 via the pinion gear 31S.

[0095] The first planetary gear mechanism 31 has a planetary gear 311P, a planetary gear 312P arranged forward of the planetary gear 311P, a first carrier 31C supporting each of the multiple planetary gears 311P and the multiple planetary gears 312P, an internal gear 311R arranged around the multiple planetary gears 311P, and an internal gear 312R arranged around the multiple planetary gears 312P.

[0096] The second planetary gear mechanism 32 has a sun gear 32S, a plurality of planetary gears 32P arranged around the sun gear 32S, a second carrier 32C that supports the plurality of planetary gears 32P, and an internal gear 32R arranged around the plurality of planetary gears 32P.

[0097] The third planetary gear mechanism 33 has a sun gear 33S, a plurality of planetary gears 33P arranged around the sun gear 33S, a third carrier 33C that supports the plurality of planetary gears 33P, and an internal gear 33R arranged around the plurality of planetary gears 33P.

[0098] The spindle 81 is connected to the third carrier 33C via a spindle lock mechanism 50. The spindle lock mechanism 50 has a lock cam 51 arranged around the spindle 81 and a lock ring 52 that rotatably supports the lock cam 51. The lock ring 52 is arranged inside the second casing 4B. The lock ring 52 is fixed to the second casing 4B. Rotation of the third carrier 33C rotates the spindle 81.

[0099] The spindle 81 is rotatably supported by a bearing 83 and a bearing 84. While being supported by the bearings 83 and 84, the spindle 81 is movable in the front-rear direction.

[0100] The spindle 81 has a flange portion 81F. A coil spring 87 is disposed between the flange portion 81F and the bearing 83. The flange portion 81F contacts the front end portion of the coil spring 87. The coil spring 87 generates an elastic force that moves the spindle 81 forward.

[0101] The chuck 82 is capable of holding a tool bit. The chuck 82 is connected to the front part of the spindle 81. A screw hole 81R is provided in the front end part of the spindle 81. When the spindle 81 rotates, the chuck 82 rotates. The chuck 82 rotates while holding the tool bit.

[0102] The first cam 41 and the second cam 42 of the vibration mechanism 40 are disposed inside the second casing 4B. In the front-rear direction, the first cam 41 and the second cam 42 are disposed between the bearing 83 and the bearing 84.

[0103] The first cam 41 is ring-shaped. The first cam 41 is arranged around the spindle 81. The first cam 41 is fixed to the spindle 81. The first cam 41 rotates together with the spindle 81. Cam teeth are provided on the rear surface of the first cam 41. The first cam 41 is supported by a stop ring 44. The stop ring 44 is arranged around the spindle 81. In the front-rear direction, the stop ring 44 is arranged between the first cam 41 and the bearing 83.

[0104] The second cam 42 is ring-shaped. The second cam 42 is disposed behind the first cam 41. The second cam 42 is disposed around the spindle 81. The second cam 42 is rotatable relative to the spindle 81. Cam teeth are provided on the front surface of the second cam 42. The cam teeth on the front surface of the second cam 42 mesh with the cam teeth on the rear surface of the first cam 41. A pawl is provided on the rear surface of the second cam 42.

[0105] A support ring 45 is disposed between the second cam 42 and the bearing 84 in the front-rear direction. The support ring 45 is disposed inside the second casing 4B. The support ring 45 is fixed to the second casing 4B. A plurality of steel balls 46 are disposed on the front surface of the support ring 45. A washer 47 is disposed between the steel balls 46 and the second cam 42. The second cam 42 is rotatable in the space defined by the support ring 45 and the washer 47 while its front-rear movement is restricted.

[0106] The vibration switching ring 43 switches between vibration mode and non-vibration mode. The mode switching ring 13 is connected to the vibration switching ring 43 via a cam ring 48. The mode switching ring 13 and the cam ring 48 are rotatable together. The vibration switching ring 43 is movable in the front-rear direction. The vibration switching ring 43 has a protrusion 43T. The protrusion 43T is inserted into a guide hole provided in the second casing 4B. The vibration switching ring 43 is movable in the front-rear direction while being guided by the guide hole provided in the second casing 4B. The protrusion 43T restricts the rotation of the vibration switching ring 43. When the mode switching ring 13 is operated by an operator, the vibration switching ring 43 moves in the front-rear direction. The vibration switching ring 43 switches between vibration mode and non-vibration mode by moving in the front-rear direction between a forward position and a retracted position further rearward than the forward position. By operating the mode switching ring 13, the vibration mode and the non-vibration mode can be switched.

[0107] The vibration mode includes a state in which rotation of the second cam 42 is restricted. The non-vibration mode includes a state in which rotation of the second cam 42 is permitted. When the vibration switching ring 43 moves to the forward position, rotation of the second cam 42 is restricted. When the vibration switching ring 43 moves to the backward position, rotation of the second cam 42 is permitted.

[0108] In the vibration mode, at least a portion of the vibration switching ring 43 that has moved to the forward position comes into contact with the second cam 42. The contact between the vibration switching ring 43 and the second cam 42 restricts the rotation of the second cam 42. When the motor 6 is driven while the rotation of the second cam 42 is restricted, the first cam 41 fixed to the spindle 81 rotates while contacting the cam teeth of the second cam 42. As a result, the spindle 81 rotates while vibrating in the front-to-rear direction.

[0109] In the non-vibration mode, the vibration switching ring 43, which has moved to the retracted position, moves away from the second cam 42. The movement of the vibration switching ring 43 away from the second cam 42 allows the second cam 42 to rotate. When the motor 6 is driven while the rotation of the second cam 42 is allowed, the second cam 42 rotates together with the first cam 41 and the spindle 81. This allows the spindle 81 to rotate in the front-to-rear direction without vibrating.

[0110] The vibration switching ring 43 is disposed around the first cam 41 and the second cam 42. The vibration switching ring 43 also has a facing portion 43S that faces the rear surface of the second cam 42. The facing portion 43S protrudes radially inward from the rear portion of the vibration switching ring 43.

[0111] When the mode switching ring 13 is operated and the vibration switching ring 43 moves to the forward position, the claw on the rear surface of the second cam 42 comes into contact with the opposing portion 43S of the vibration switching ring 43. This restricts the rotation of the second cam 42. In this way, when the mode switching ring 13 is operated and the vibration switching ring 43 moves to the forward position, the vibration mechanism 40 is switched to the vibration mode.

[0112] When the mode switching ring 13 is operated and the vibration switching ring 43 moves to the retracted position, the opposing portion 43S of the vibration switching ring 43 moves away from the second cam 42. This allows the second cam 42 to rotate. In this way, when the mode switching ring 13 is operated and the vibration switching ring 43 moves to the retracted position, the vibration mechanism 40 is switched to the non-vibration mode.

[0113] <Deceleration mechanism> FIG. 6 is a front perspective view showing a portion of the driver drill 1 according to the present embodiment. FIG. 7 is a front view showing a portion of the driver drill 1 according to the present embodiment. FIG. 8 is a cross-sectional view showing the power transmission mechanism 7 according to the present embodiment, which corresponds to the cross-sectional view taken along line AA in FIG. 7. FIG. 9 is a cross-sectional view showing the power transmission mechanism 7 according to the present embodiment, which corresponds to the cross-sectional view taken along line DD in FIG. 7. FIG. 10 is a cross-sectional view showing the power transmission mechanism 7 according to the present embodiment, which corresponds to the cross-sectional view taken along line RR in FIG. 7.

[0114] The casing 4 houses the power transmission mechanism 7. The casing 4 includes a first casing 4A, a second casing 4B, a bracket plate 4C, and a stop plate 4D. The second casing 4B is disposed in front of the first casing 4A. The speed change lever 12 is disposed above the first casing 4A. The mode change ring 13 is disposed in front of the second casing 4B.

[0115] The first casing 4A is fixed to the rear end of the second casing 4B. The bracket plate 4C is arranged to cover the opening at the rear end of the first casing 4A. The bracket plate 4C is fixed to the rear end of the first casing 4A with screws 4E. The stop plate 4D is arranged to cover the opening at the front end of the second casing 4B. The stop plate 4D is fixed to the front end of the second casing 4B with screws 4F.

[0116] As described with reference to FIG. 5, pinion gear 31S includes large diameter portion 311S and small diameter portion 312S disposed forward of large diameter portion 311S.

[0117] The first planetary gear mechanism 31 has a planetary gear 311P, a planetary gear 312P arranged forward of the planetary gear 311P, a first carrier 31C supporting each of the multiple planetary gears 311P and the multiple planetary gears 312P, an internal gear 311R arranged around the multiple planetary gears 311P, and an internal gear 312R arranged around the multiple planetary gears 312P.

[0118] A plurality of planetary gears 311P (first planetary gears) are arranged around the large diameter portion 311S of the pinion gear 31S. A plurality of planetary gears 312P (second planetary gears) are arranged around the small diameter portion 312S of the pinion gear 31S. The first carrier 31C supports each of the plurality of planetary gears 311P and the plurality of planetary gears 312P. The internal gear 311R (first internal gear) is arranged around the plurality of planetary gears 311P. The internal gear 312R (second internal gear) is arranged around the plurality of planetary gears 312P. The outer diameter of the planetary gear 311P is smaller than the outer diameter of the planetary gear 312P. A pin 31A is provided on the first carrier 31C. Planetary gears 311P and 312P are rotatably supported by pins 31 A. First carrier 31C rotatably supports planetary gears 311P and 312P via pins 31 A. Gears are provided on the outer periphery of first carrier 31C.

[0119] The second planetary gear mechanism 32 has a sun gear 32S, a plurality of planetary gears 32P arranged around the sun gear 32S, a second carrier 32C supporting the plurality of planetary gears 32P, and an internal gear 32R arranged around the plurality of planetary gears 32P. The sun gear 32S is arranged in front of the first carrier 31C. The diameter of the sun gear 32S is smaller than the diameter of the first carrier 31C. The first carrier 31C and the sun gear 32S are integral. The first carrier 31C and the sun gear 32S rotate together. A pin 32A is provided on the second carrier 32C. The planetary gear 32P is rotatably supported by the pin 32A. The second carrier 32C rotatably supports the planetary gear 32P via the pin 32A.

[0120] The third planetary gear mechanism 33 includes a sun gear 33S, a plurality of planetary gears 33P arranged around the sun gear 33S, a third carrier 33C supporting the plurality of planetary gears 33P, and an internal gear 33R arranged around the plurality of planetary gears 33P. The sun gear 33S is arranged in front of the second carrier 32C. The diameter of the sun gear 33S is smaller than the diameter of the second carrier 32C. The second carrier 32C and the sun gear 33S are integral. The second carrier 32C and the sun gear 33S rotate together. A pin 33A is provided on the third carrier 33C. The planetary gear 33P is rotatably supported by the pin 33A. The third carrier 33C rotatably supports the planetary gear 33P via the pin 33A.

[0121] Fig. 11 is a cross-sectional view showing the reduction mechanism 30 according to this embodiment, and corresponds to the cross-sectional view taken along line CC in Fig. 8. Fig. 12 is a perspective view of the reduction mechanism 30 according to this embodiment, seen from the front right. Fig. 13 is a perspective view of the reduction mechanism 30 according to this embodiment, seen from the front left.

[0122] As shown in FIGS. 8, 9, 10, 11, and 12, the speed reduction mechanism 30 has a first speed switching mechanism 71 and a second speed switching mechanism 72.

[0123] The first speed switching mechanism 71 switches between a first deceleration mode in which rotation of the internal gear 312R of the first planetary gear mechanism 31 is prevented and rotation of the internal gear 311R is allowed, and a second deceleration mode in which rotation of the internal gear 311R of the first planetary gear mechanism 31 is prevented and rotation of the internal gear 312R is allowed.

[0124] The first speed change mechanism 71 has an annular member 35 and a cam pin 250.

[0125] The annular member 35 is connected to the cam pin 250. The annular member 35 is movable in the front-rear direction inside the first casing 4A. When the annular member 35 moves forward, the first deceleration mode is entered, and when the annular member 35 moves backward, the second deceleration mode is entered.

[0126] In this embodiment, the reduction ratio of the rear stage (first stage) of the first planetary gear mechanism 31 consisting of the planetary gear 311P and the internal gear 311R is different from the reduction ratio of the front stage (second stage) of the first planetary gear mechanism 31 consisting of the planetary gear 312P and the internal gear 312R. The reduction ratio of the front stage consisting of the planetary gear 312P and the internal gear 312R is greater than the reduction ratio of the rear stage consisting of the planetary gear 311P and the internal gear 311R. When the pinion gear 31S rotates at a constant rotation speed, the rotation speed of the first carrier 31C in the first deceleration mode is slower than the rotation speed of the first carrier 31C in the second deceleration mode.

[0127] The annular member 35 includes a wire disposed around at least one of the internal gears 311R and 312R. An upper portion of the annular member 35 is fixed to a lever member 37. The lever member 37 is connected to the speed selector lever 12. The lever member 37 is guided in the front-rear direction by a guide rod 38. The guide rod 38 is fixed to at least a portion of the first casing 4A. In the embodiment, the rear end portion of the guide rod 38 is fixed to the bracket plate 4C. A coil spring 39 is supported on the guide rod 38. The rear end portion of the coil spring 39 is supported on the bracket plate 4C. The front end portion of the coil spring 39 is connected to the lever member 37. The coil spring 39 biases the annular member 35 forward via the lever member 37.

[0128] The cam pin 250 is hooked onto the annular member 35. The cam pin 250 has a groove 250A in which the annular member 35 is disposed. A plurality of cam pins 250 are provided. The internal gear 311R and the internal gear 312R are each housed in the first casing 4A. As shown in FIG. 11 , a guide groove 4G that guides the cam pin 250 is provided on the inner surface of the first casing 4A. The cam pin 250 is disposed in the guide groove 4G of the first casing 4A. The guide groove 4G is long in the front-rear direction. The cam pin 250 can move in the front-rear direction while being guided by the guide groove 4G. Because the cam pin 250 is disposed in the guide groove 4G, it does not move in the circumferential direction.

[0129] A plurality of cam teeth 311F are provided on the outer peripheral surface of the internal gear 311R. A plurality of cam teeth 312F are provided on the outer peripheral surface of the internal gear 312R. The cam pin 250 is a contact member that comes into contact with either the cam teeth 311F of the internal gear 311R or the cam teeth 312F of the internal gear 312R. The cam pin 250 is guided by the guide groove 4G and moves between a position facing the outer peripheral surface of the internal gear 311R and a position facing the outer peripheral surface of the internal gear 312R. Contact between the cam teeth 311F and the cam pin 250 prevents rotation of the internal gear 311R. Contact between the cam teeth 312F and the cam pin 250 prevents rotation of the internal gear 312R.

[0130] The annular member 35 is connected to the speed selector lever 12. When the speed selector lever 12 is operated to move in the front-rear direction, the annular member 35 moves in the front-rear direction. When the annular member 35 moves in the front-rear direction, the cam pin 250 moves in the front-rear direction together with the annular member 35.

[0131] When the annular member 35 moves forward and is positioned around the internal gear 312R, and the cam pin 250 is positioned to face the outer circumferential surface of the internal gear 312R, the cam teeth 312F come into contact with the cam pin 250. This prevents the internal gear 312R from rotating. In other words, when the annular member 35 moves forward and prevents the internal gear 312R from rotating, the first planetary gear mechanism 31 enters the first deceleration mode.

[0132] When the annular member 35 moves rearward and is positioned around the internal gear 311R, and the cam pin 250 is positioned to face the outer circumferential surface of the internal gear 311R, the cam teeth 311F come into contact with the cam pin 250. This prevents the internal gear 311R from rotating. In other words, when the annular member 35 moves forward and prevents the internal gear 311R from rotating, the first planetary gear mechanism 31 enters the second reduction mode.

[0133] The second speed switching mechanism 72 switches between an enabled mode in which the speed reduction function of the second planetary gear mechanism 32 is enabled, and a disabled mode in which the speed reduction function of the second planetary gear mechanism 32 is disabled. Placing the second planetary gear mechanism 32 in the enabled mode includes preventing rotation of the internal gear 32R. Placing the second planetary gear mechanism 32 in the disabled mode includes allowing rotation of the internal gear 32R. By preventing rotation of the internal gear 32R, the second planetary gear mechanism 32 is in the enabled mode. By allowing rotation of the internal gear 32R, the second planetary gear mechanism 32 is in the disabled mode.

[0134] The second speed change mechanism 72 has a speed change member 34 connected to the speed change lever 12 and the internal gear 32R, respectively, and a cam ring 36 into which the internal gear 32R is inserted to prevent rotation of the internal gear 32R.

[0135] The speed switching member 34 is movable in the front-rear direction inside the first casing 4 A. When the speed switching member 34 moves forward, the active mode is established, and when the speed switching member 34 moves backward, the inactive mode is established.

[0136] The speed switching member 34 has a ring portion 34A, a slider portion 34B, and a lever portion 34C. The ring portion 34A is disposed around the internal gear 32R. The ring portion 34A is connected to the internal gear 32R via a pin 34D. A recess 32D into which the pin 34D is inserted is provided on the outer peripheral surface of the internal gear 32R. The ring portion 34A and the internal gear 32R are connected by inserting the pin 34D into the recess 32D of the internal gear 32R. The slider portion 34B is disposed so as to extend rearward from the ring portion 34A. A plurality of slider portions 34B are provided at intervals in the circumferential direction. The slider portions 34B are guided in the front-rear direction by a guide groove provided on the inner surface of the first casing 4A. The lever portion 34C is provided on the upper portion of the ring portion 34A. Lever portion 34C is connected to speed change lever 12. Lever portion 34C has a protrusion 34E that protrudes upward from the top surface of lever portion 34C. Coil spring 34F is arranged in front of protrusion 34E. Coil spring 34G is arranged behind protrusion 34E. The front end of coil spring 34F is supported by at least a portion of first casing 4A. The rear end of coil spring 34F is connected to protrusion 34E. The rear end of coil spring 34G is supported by at least a portion of speed change lever 12. The front end of coil spring 34G is connected to protrusion 34E. Coil spring 34F urges speed change member 34 rearward. Coil spring 34G urges speed change member 34 forward.

[0137] The cam ring 36 is disposed in front of the internal gear 32R. The cam ring 36 is fixed to the first casing 4A. Cam teeth are provided on the inner peripheral surface of the cam ring 36. A plurality of the cam teeth are provided at intervals in the circumferential direction. Cam teeth 32F are provided on the outer peripheral surface of the internal gear 32R. The cam teeth 32F can mesh with the cam teeth of the cam ring 36.

[0138] When the speed switching lever 12 is operated to move in the front-rear direction, the speed switching member 34 moves in the front-rear direction. When the speed switching member 34 moves in the front-rear direction, the internal gear 32R, which is connected to the ring portion 34A via the pin 34D, moves in the front-rear direction. When the internal gear 32R moves in the front-rear direction, the internal gear 32R switches between a state in which it is inserted into the cam ring 36 and a state in which it is removed from the cam ring 36.

[0139] The internal gear 32R moves forward, and at least a portion of the internal gear 32R is inserted inside the cam ring 36, and the cam teeth of the cam ring 36 mesh with the cam teeth 32F of the internal gear 32R, thereby preventing rotation of the internal gear 32R. In other words, the speed switching member 34 moves forward, preventing rotation of the internal gear 32R, and the second planetary gear mechanism 32 enters the effective mode.

[0140] The internal gear 32R moves rearward, the internal gear 32R is removed from the inside of the cam ring 36, and the cam teeth of the cam ring 36 and the cam teeth 32F of the internal gear 32R are separated, thereby allowing the internal gear 32R to rotate. In other words, the speed switching member 34 moves rearward, allowing the internal gear 32R to rotate, and the second planetary gear mechanism 32 enters the disabled mode.

[0141] When the second planetary gear mechanism 32 is in the active mode, the internal gear 32R meshes only with the planetary gear 32P. When the second planetary gear mechanism 32 is in the inactive mode, the internal gear 32R meshes with both the planetary gear 32P and the first carrier 31C.

[0142] As described above, in the embodiment, the speed modes of the reduction mechanism 30 include a low speed mode, a medium speed mode, and a high speed mode.

[0143] The movable range of the speed switch lever 12 is defined in the front-to-rear direction. When the speed switch lever 12 is operated to move to a first position P1 at the rear of the movable range, the speed mode of the reduction mechanism 30 is set to high-speed mode. When the speed switch lever 12 is operated to move to a second position P2 at the middle of the movable range, the speed mode of the reduction mechanism 30 is set to medium-speed mode. When the speed switch lever 12 is operated to move to a third position P3 at the front of the movable range, the speed mode of the reduction mechanism 30 is set to low-speed mode.

[0144] The high-speed mode includes the first planetary gear mechanism 31 being set to the second deceleration mode and the second planetary gear mechanism 32 being set to the disabled mode. When the speed selector lever 12 is operated to move to the first position P1 at the rear of its movable range, the first planetary gear mechanism 31 is set to the second deceleration mode and the second planetary gear mechanism 32 is set to the disabled mode.

[0145] The medium speed mode includes a state in which the first planetary gear mechanism 31 is set to the first deceleration mode and the second planetary gear mechanism 32 is set to the disabled mode. When the speed selector lever 12 is operated to move to the second position P2 in the middle of its movable range, the first planetary gear mechanism 31 is set to the first deceleration mode and the second planetary gear mechanism 32 is set to the disabled mode.

[0146] The low-speed mode includes the first planetary gear mechanism 31 being set to the first deceleration mode and the second planetary gear mechanism 32 being set to the active mode. When the speed selector lever 12 is operated to move to the third position P3 at the front of the movable range, the first planetary gear mechanism 31 is set to the first deceleration mode and the second planetary gear mechanism 32 is set to the active mode.

[0147] Each of Figures 6 to 13 shows a state in which the speed reduction mechanism 30 is set to the low speed mode.

[0148] Fig. 14 is a cross-sectional view showing the power transmission mechanism 7 according to this embodiment, and corresponds to the cross-sectional view taken along line AA in Fig. 7. Fig. 15 is a cross-sectional view showing the power transmission mechanism 7 according to this embodiment, and corresponds to the cross-sectional view taken along line DD in Fig. 7. Fig. 16 is a cross-sectional view showing the power transmission mechanism 7 according to this embodiment, and corresponds to the cross-sectional view taken along line RR in Fig. 7. Figs. 14 to 16 show a state in which the reduction mechanism 30 is set to the medium speed mode.

[0149] The speed switch lever 12 is moved to the second position P2, which is in the middle of its movable range, so that the reduction gear mechanism 30 is in the medium speed mode. When the speed switch lever 12 is moved to the second position P2, which is in the middle, the lever portion 34C moves rearward due to the biasing force of the coil spring 34F. This causes the speed switch member 34 to move rearward. As the speed switch member 34 moves rearward, the internal gear 32R, which is connected to the ring portion 34A via the pin 34D, moves rearward. As the internal gear 32R moves rearward, it is disengaged from the cam ring 36 and meshes with both the planetary gear 32P and the first carrier 31C.

[0150] When the speed selector lever 12 is located at the second position P2 in the middle of its movable range, the annular member 35 remains positioned around the internal gear 312R. In the first planetary gear mechanism 31, rotation of the internal gear 312R is prevented, while rotation of the internal gear 311R is permitted.

[0151] Fig. 17 is a cross-sectional view showing the power transmission mechanism 7 according to this embodiment, and corresponds to the cross-sectional view taken along line AA in Fig. 7. Fig. 18 is a cross-sectional view showing the power transmission mechanism 7 according to this embodiment, and corresponds to the cross-sectional view taken along line DD in Fig. 7. Fig. 19 is a cross-sectional view showing the power transmission mechanism 7 according to this embodiment, and corresponds to the cross-sectional view taken along line RR in Fig. 7. Figs. 17 to 19 show a state in which the reduction mechanism 30 is set to high-speed mode.

[0152] The speed selector lever 12 is moved to a first position P1 at the rear of its movable range so that the reduction gear mechanism 30 is in the high-speed mode. When the speed selector lever 12 is moved to the rear, the lever member 37 is moved rearward while being guided by the guide rod 38. As the lever member 37 moves rearward, the annular member 35 moves rearward together with the cam pin 250. As a result, the annular member 35 is positioned around the internal gear 311R. Furthermore, the cam pin 250 comes into contact with the cam teeth 311F provided on the outer peripheral surface of the internal gear 311R. This prevents the internal gear 311R from rotating. As the cam pin 250 moves rearward, the cam pin 250 separates from the cam teeth 312F provided on the outer peripheral surface of the internal gear 312R. This allows the internal gear 312R to rotate.

[0153] When the speed change lever 12 is located at the first position P1 at the rear of its movable range, the internal gear 32R of the second planetary gear mechanism 32 is allowed to rotate.

[0154] <Operation of the reduction mechanism> When the motor 6 is driven to rotate the rotor shaft 63 while the reduction gear 30 is in the low-speed mode, the pinion gear 31S rotates, causing the planetary gear 312P to revolve around the small diameter portion 312S of the pinion gear 31S. The revolution of the planetary gear 312P causes the first carrier 31C and the sun gear 32S to rotate at a rotational speed lower than the rotational speed of the rotor shaft 63. The rotation of the sun gear 32S causes the planetary gear 32P to revolve around the sun gear 32S. The revolution of the planetary gear 32P causes the second carrier 32C and the sun gear 33S to rotate at a rotational speed lower than the rotational speed of the first carrier 31C. In this way, when the internal gear 32R is positioned in the low-speed mode position and the motor 6 is driven, both the deceleration function of the first planetary gear mechanism 31 and the deceleration function of the second planetary gear mechanism 32 are exerted, and the second carrier 32C and the sun gear 33S rotate in low-speed mode.

[0155] When the motor 6 is driven to rotate the rotor shaft 63 while the reduction gear 30 is set to the medium speed mode, the pinion gear 31S rotates, causing the planetary gear 312P to revolve around the small diameter portion 312S of the pinion gear 31S. The revolution of the planetary gear 312P causes the first carrier 31C and the sun gear 32S to rotate at a rotational speed lower than the rotational speed of the rotor shaft 63. The internal gear 32R meshes with both the planetary gear 32P and the first carrier 31C, so the internal gear 32R and the first carrier 31C rotate together. The rotation of the internal gear 32R causes the planetary gear 32P to revolve at the same orbital speed as the rotational speed of the internal gear 32R. Due to the revolution of planetary gear 32P, second carrier 32C and sun gear 33S rotate at the same rotational speed as first carrier 31C. In this way, when motor 6 is driven in a state in which second planetary gear mechanism 32 is set to the disabled mode, the speed reduction function of first planetary gear mechanism 31 is exerted but the speed reduction function of second planetary gear mechanism 32 is not exerted, and second carrier 32C and sun gear 33S rotate in the medium speed mode.

[0156] When the motor 6 is driven to rotate the rotor shaft 63 while the reduction gear 30 is set to the high-speed mode, the pinion gear 31S rotates, causing the planetary gear 311P to revolve around the large-diameter portion 311S of the pinion gear 31S. The revolution of the planetary gear 311P causes the first carrier 31C and the sun gear 32S to rotate at a rotational speed lower than the rotational speed of the rotor shaft 63. The internal gear 32R meshes with both the planetary gear 32P and the first carrier 31C, so the internal gear 32R and the first carrier 31C rotate together. The rotation of the internal gear 32R causes the planetary gear 32P to revolve at the same orbital speed as the rotational speed of the internal gear 32R. Due to the revolution of planetary gear 32P, second carrier 32C and sun gear 33S rotate at the same rotational speed as first carrier 31C. In this way, when motor 6 is driven in a state in which second planetary gear mechanism 32 is set to the disabled mode, the speed reduction function of first planetary gear mechanism 31 is exerted but the speed reduction function of second planetary gear mechanism 32 is not exerted, and second carrier 32C and sun gear 33S rotate in high-speed mode.

[0157] When second carrier 32C and sun gear 33S rotate, planetary gear 33P revolves around sun gear 33S. The revolution of planetary gear 33P rotates third carrier 33C. The rotation of third carrier 33C rotates spindle 81.

[0158] <Mode sensor board> 20 is a diagram schematically illustrating the mode sensor board 100 according to this embodiment. The mode sensor board 100 includes a circuit board on which multiple mode sensors 200 are mounted, which detect the position of the speed selector lever 12 in the forward / rearward direction.

[0159] The speed switch lever 12 is moved in the front-rear direction so as to switch the speed mode of the reduction mechanism 30. In this embodiment, the speed switch lever 12 is moved in the front-rear direction so as to switch the speed mode of the reduction mechanism 30 between a high-speed mode, a medium-speed mode, and a low-speed mode. The speed switch lever 12 is provided on top of the motor accommodating portion 21. At least a portion of the speed switch lever 12 is disposed outside the motor accommodating portion 21. An operator can operate the speed switch lever 12 by touching the speed switch lever 12 with their finger so that the speed switch lever 12 moves in the front-rear direction. The speed switch lever 12 is movable in the front-rear direction relative to the motor accommodating portion 21.

[0160] The speed switch lever 12 can be moved to a first position P1, a second position P2, and a third position P3 relative to the motor housing 21 within a movable range of the speed switch lever 12 defined in the front-to-rear direction. The first position P1 is defined rearward of the second position P2. The second position P2 is defined rearward of the third position P3. When the speed switch lever 12 is moved to the first position P1 at the rear of the movable range, the speed mode of the reduction mechanism 30 is set to the high-speed mode. When the speed switch lever 12 is moved to the second position P2 at the middle of the movable range, the speed mode of the reduction mechanism 30 is set to the medium-speed mode. When the speed switch lever 12 is moved to the third position P3 at the front of the movable range, the speed mode of the reduction mechanism 30 is set to the low-speed mode.

[0161] The relative position of the mode sensor board 100 and the motor accommodating section 21 is always fixed. The mode sensor board 100 does not move relative to the motor accommodating section 21. The mode sensor board 100 may be fixed to the housing 2 or the casing 4. The mode sensor board 100 is disposed below the speed switch lever 12. At least a portion of the speed switch lever 12 and the mode sensor board 100 face each other.

[0162] The mode sensor 200 detects the position of the speed selector lever 12 in the front-to-rear direction. Multiple mode sensors 200 are mounted on the upper surface of the mode sensor board 100. The mode sensors 200 are fixed to the mode sensor board 100. On the upper surface of the mode sensor board 100, the multiple mode sensors 200 are arranged at intervals in the front-to-rear direction, which is the direction of movement of the speed selector lever 12. In this embodiment, two mode sensors 200 are arranged at an interval in the front-to-rear direction.

[0163] In the following description, one mode sensor 200 will be referred to as a first mode sensor 201, and the other mode sensor 200 will be referred to as a second mode sensor 202. The first mode sensor 201 is disposed behind the second mode sensor 202.

[0164] The speed switch lever 12 holds a permanent magnet 120. The permanent magnet 120 is fixed to the speed switch lever 12. In the front-to-rear direction, the permanent magnet 120 is disposed in the center of the speed switch lever 12. A recess 121 is formed in the lower surface of the speed switch lever 12. The permanent magnet 120 is disposed inside the recess 121. The lower surface of the permanent magnet 120 and the upper surface of the mode sensor 200 can face each other.

[0165] The mode sensor 200 includes a Hall sensor that detects the permanent magnet 120. The Hall sensor is a magnetic sensor that includes a Hall element that detects the magnetic field of the permanent magnet 120. The mode sensor 200 detects the position of the speed selector lever 12 by detecting the magnetic field of the permanent magnet 120.

[0166] <Control System> 21 is a block diagram showing a control system 1000 of the driver drill 1 according to this embodiment. The control system 1000 includes a mode sensor board 100 and a controller board 17.

[0167] The mode sensor board 100 has a speed mode detection circuit 101 , an output terminal 102 , and an input terminal 103 .

[0168] The speed mode detection circuit 101 includes a mode sensor 200. The speed mode detection circuit 101 detects the position of the speed switch lever 12 to detect the speed mode of the speed reduction mechanism 30.

[0169] The output terminal 102 is connected to the speed mode detection circuit 101. The output terminal 102 outputs an output signal from the speed mode detection circuit 101. In the embodiment, two output terminals 102 are provided.

[0170] In the following description, one output terminal 102 will be referred to as a first output terminal 102A, and the other output terminal 102 will be referred to as a second output terminal 102B, as appropriate.

[0171] The output terminal 102 is connected to the controller board 17 via output lead wires 104. The output lead wires 104 include a first output lead wire 104A connected to the first output terminal 102A and a second output lead wire 104B connected to the second output terminal 102B. The output signal of the speed mode detection circuit 101 is transmitted to the controller board 17 via the output terminal 102 and the output lead wires 104.

[0172] The input terminal 103 is connected to the speed mode detection circuit 101. A voltage is applied to the speed mode detection circuit 101 via the input terminal 103. In this embodiment, one input terminal 103 is provided. The input terminal 103 is connected to the controller board 17 via an input lead wire 105. The controller board 17 applies a voltage to the speed mode detection circuit 101 via the input lead wire 105 and the input terminal 103. The speed mode detection circuit 101 is connected to a ground section via a ground line 106. The ground section is a portion that serves as a reference for the potential of the speed mode detection circuit 101. The potential of the ground section is, for example, 0 [V].

[0173] The mode sensor board 100 is housed in the motor housing 21. The controller board 17 is disposed in the battery holding portion 23. At least a portion of the output lead wire 104 is disposed in the internal space of the grip portion 22. At least a portion of the input lead wire 105 is disposed in the internal space of the grip portion 22.

[0174] The controller board 17 includes a motor control circuit 171 , a motor drive circuit 172 , a voltage adjustment circuit 173 , a torque estimation circuit 174 , a correlation data storage circuit 175 , and a torque threshold setting circuit 176 .

[0175] The motor control circuit 171 includes a microcomputer and is connected to both the trigger signal generating circuit 10A and the forward / reverse rotation switching signal generating circuit 11A.

[0176] When the trigger lever 10 is operated, the trigger signal generating circuit 10A generates a trigger signal. The trigger signal is input to the motor control circuit 171. The motor control circuit 171 outputs a control command for driving the motor 6 based on the trigger signal.

[0177] When the forward / reverse rotation switching lever 11 is operated, the forward / reverse rotation switching signal generating circuit 11A generates a forward / reverse rotation switching signal. The forward / reverse rotation switching signal is input to the motor control circuit 171. The motor control circuit 171 outputs a control command for switching the rotation direction of the motor 6 based on the forward / reverse rotation switching signal.

[0178] The motor drive circuit 172 supplies a drive current to the coil 61D based on power supplied from the battery pack 20. The motor drive circuit 172 includes a plurality of switching elements. The plurality of switching elements of the motor drive circuit 172 operate based on a control command from the motor control circuit 171. The plurality of coils 61D of the motor 6 are assigned to one of the U-phase, V-phase, and W-phase. Based on the control command from the motor control circuit 171, the motor drive circuit 172 supplies a U-phase drive current to the U-phase coil 61D, a V-phase drive current to the V-phase coil 61D, and a W-phase drive current to the W-phase coil 61D.

[0179] The voltage adjustment circuit 173 applies a voltage to the speed mode detection circuit 101 based on the power supplied from the battery pack 20. The voltage adjustment circuit 173 is connected to the input terminal 103 via the input lead wire 105. The voltage adjustment circuit 173 adjusts the voltage applied to the speed mode detection circuit 101. The voltage adjustment circuit 173 includes a step-down circuit. The voltage adjustment circuit 173 applies a voltage lower than the rated voltage of the battery pack 20 to the speed mode detection circuit 101.

[0180] The torque estimation circuit 174 estimates the torque acting on the motor 6 when the motor 6 is driven. In this embodiment, the torque estimation circuit 174 estimates the torque acting on the motor 6 based on the drive current supplied to the coil 61D and the rotation speed of the rotor 62 detected by the rotation sensor on the rotation sensor board 90.

[0181] The torque threshold setting circuit 176 is connected to the threshold signal generating circuit 16A. When the dial 16 is operated, the threshold signal generating circuit 16A generates a threshold signal that indicates the input value of the torque threshold. The threshold signal is input to the torque threshold setting circuit 176.

[0182] The correlation data storage circuit 175 stores correlation data indicating the relationship between the input value of the torque threshold defined by the threshold signal generated by the threshold signal generation circuit 16A, the set value of the torque threshold, and the speed mode of the reduction mechanism 30.

[0183] 22 is a diagram showing an example of correlation data stored in the correlation data storage circuit 175 according to this embodiment. In this embodiment, the operator can input 41 different torque thresholds by operating the dial 16. The threshold signal generation circuit 16A generates threshold signals indicating the input values ​​of the 41 different torque thresholds based on the amount of operation of the dial 16. Note that the number of input torque threshold values ​​does not have to be 41, and may be fewer or more than 41.

[0184] 22, the torque threshold setting value is set to different values ​​for the high speed mode, medium speed mode, and low speed mode with respect to the input value of the torque threshold. For example, if the input value of the torque threshold is 21 steps, the torque threshold in the high speed mode is set to a value TH1, the torque threshold in the medium speed mode is set to a value TH2 that is larger than TH1, and the torque threshold in the low speed mode is set to a value TH3 that is larger than TH2.

[0185] The correlation data shown in Fig. 22 is an example. For example, when the speed stage of the input value of the torque threshold is small, the set value of the torque threshold may be the same for the high speed mode, the medium speed mode, and the low speed mode.

[0186] The torque threshold setting circuit 176 sets a torque threshold based on the threshold signal input from the threshold signal generation circuit 16A, the correlation data stored in the correlation data storage circuit 175, and the speed mode of the reduction mechanism 30 detected by the speed mode detection circuit 101. The torque threshold setting circuit 176 is connected to the speed mode detection circuit 101 via an output lead wire 104 and an output terminal 102. The torque threshold setting circuit 176 can receive an output signal from the speed mode detection circuit 101 indicating the speed mode of the reduction mechanism 30 via the output terminal 102 and the output lead wire 104. The torque threshold setting circuit 176 can determine the speed mode of the reduction mechanism 30 based on the output signal from the speed mode detection circuit 101 output from the output terminal 102. The torque threshold setting circuit 176 can determine whether the reduction mechanism 30 is set to the high speed mode, the medium speed mode, or the low speed mode based on the output signal from the speed mode detection circuit 101 output from the output terminal 102.

[0187] The motor control circuit 171 outputs a control command to control the motor 6 based on the torque acting on the motor 6 estimated by the torque estimation circuit 174 and the torque threshold set by the torque threshold setting circuit 176. When the motor control circuit 171 determines that the torque acting on the motor 6 estimated by the torque estimation circuit 174 exceeds the torque threshold set by the torque threshold setting circuit 176 while the motor 6 is driving in the clutch mode, it outputs a control command to stop the motor 6.

[0188] <Speed ​​mode detection circuit> 23 is a diagram showing a speed mode detection circuit 101 according to this embodiment. As shown in FIG. 23, a plurality of mode sensors 200 (201, 202) are connected in parallel to each other with respect to an input terminal 103. The plurality of mode sensors 200 (201, 202) are connected in parallel to each other with respect to a ground section. Each of the plurality of mode sensors 200 (201, 202) has a power supply port 211 to which current is supplied from the input terminal 103, a ground port 212 connected to the input terminal 103 via a resistor 109, and a ground port 213 connected to the ground section via a ground line 106.

[0189] Each of the multiple mode sensors 200 (201, 202) is connected to the input terminal 103 via a power line 107. The power port 211 of the first mode sensor 201 is connected to the input terminal 103 via a first power line 107A and a power line 107. The power port 211 of the second mode sensor 202 is connected to the input terminal 103 via a second power line 107B and a power line 107. The first power line 107A and the second power line 107B are connected in parallel to the input terminal 103. The power line 107 connects the input terminal 103 to each of the first power line 107A and the second power line 107B. A voltage is applied to the first mode sensor 201 via the input terminal 103, the power line 107, and the first power line 107A. A voltage is applied to the second mode sensor 202 via the input terminal 103, the power line 107, and the second power line 107B.

[0190] Each of the multiple mode sensors 200 (201, 202) is connected to an output terminal 102 via a signal line 108. The output terminal 102 is connected to each of the multiple mode sensors 200 (201, 202) one by one. In this embodiment, the output terminal 102 includes a first output terminal 102A connected to the first mode sensor 201 and a second output terminal 102B output to the second mode sensor 202. The signal line 108 includes a first signal line 108A connecting the first mode sensor 201 and the first output terminal 102A and a second signal line 108B connecting the second mode sensor 202 and the second output terminal 102B. The ground port 212 of the first mode sensor 201 is connected to the first output terminal 102A via the first signal line 108A. The ground port 212 of the second mode sensor 202 is connected to the second output terminal 102B via the second signal line 108B.

[0191] Each of the multiple mode sensors 200 (201, 202) is connected to the input terminal 103 via a resistor 109. The resistor 109 includes a first resistor 109A connected to the first mode sensor 201 and a second resistor 109B connected to the second mode sensor 202. The first resistor 109A and the second resistor 109B are connected in parallel to each other with respect to the input terminal 103. The first resistor 109A is arranged to connect the power supply line 107 and the first signal line 108A. The second resistor 109B is arranged to connect the power supply line 107 and the second signal line 108B. A ground port 212 of the first mode sensor 201 is connected to the input terminal 103 via the first signal line 108A, the first resistor 109A, and the power supply line 107. The ground port 212 of the second mode sensor 202 is connected to the input terminal 103 via the second signal line 108B, the second resistor 109B, and the power line 107.

[0192] Each of the multiple mode sensors 200 (201, 202) is connected to the ground via a ground line 106. The ground port 213 of the first mode sensor 201 is connected to the ground via a first ground line 106A and the ground line 106. The ground port 213 of the second mode sensor 202 is connected to the ground via a second ground line 106B and the ground line 106. The first ground line 106A and the second ground line 106B are connected in parallel to each other with respect to the ground. The ground line 106 connects the ground to each of the first ground line 106A and the second ground line 106B.

[0193] Fig. 24 is a diagram for explaining the position of the speed switching lever 12 relative to the mode sensor board 100 according to this embodiment. Fig. 25 is a diagram for explaining the relationship between the position of the speed switching lever 12, the state of the mode sensor 200, and the output signal output from the output terminal 102 according to this embodiment.

[0194] 24, the speed selector lever 12 is moved to a first position P1, a second position P2, and a third position P3. The first position P1 is located rearward of the second position P2. The second position P2 is located rearward of the third position P3. The first mode sensor 201 is located rearward of the second mode sensor 202.

[0195] When the speed switch lever 12 is located at the first position P1, the permanent magnet 120 faces the first mode sensor 201 but does not face the second mode sensor 202. When the speed switch lever 12 is located at the second position P2, the permanent magnet 120 faces neither the first mode sensor 201 nor the second mode sensor 202. When the speed switch lever 12 is located at the second position P2, the permanent magnet 120 faces the space between the first mode sensor 201 and the second mode sensor 202. When the speed switch lever 12 is located at the third position P3, the permanent magnet 120 faces the second mode sensor 202 but does not face the first mode sensor 201.

[0196] The mode sensor 200 detects the permanent magnet 120 when the permanent magnet 120 faces the mode sensor 200. The first mode sensor 201 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1, and not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the second position P2 or the third position P3. The second mode sensor 202 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the third position P3, and not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1 or the second position P2.

[0197] When the mode sensor 200 detects the permanent magnet 120, it enters an ON state in which the ground port 212 and the ground port 213 are connected, and when it does not detect the permanent magnet 120, it enters an OFF state in which the ground port 212 and the ground port 213 are not connected.

[0198] 25, when the speed switch lever 12 is placed at the first position P1, the first mode sensor 201 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed at least one of the second position P2 and the third position P3, the first mode sensor 201 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0199] 25, when the speed switch lever 12 is placed at the third position P3, the second mode sensor 202 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed at least one of the first position P1 and the second position P2, the second mode sensor 202 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0200] When the first mode sensor 201 is in the ON state, the potential of the first output terminal 102A is substantially equal to the potential of the ground section. The current supplied from the input terminal 103 to the first resistor 109A flows to the ground section via the first mode sensor 201, the first ground line 106A, and the ground line 106, but does not flow to the first output terminal 102A. Therefore, an output signal of L level (first level) is output from the first output terminal 102A.

[0201] When first mode sensor 201 is in the OFF state, the potential of first output terminal 102A is higher than the potential of the ground. The current supplied from input terminal 103 to first resistor 109A flows to first output terminal 102A via first signal line 108A, but does not flow to the ground. Therefore, an H-level (second level) output signal is output from first output terminal 102A.

[0202] When the second mode sensor 202 is in the ON state, the potential of the second output terminal 102B is substantially equal to the potential of the ground section. The current supplied from the input terminal 103 to the second resistor 109B flows to the ground section via the second mode sensor 202, the second ground line 106B, and the ground line 106, but does not flow to the second output terminal 102B. As a result, an output signal of L level (first level) is output from the second output terminal 102B.

[0203] When the second mode sensor 202 is in the OFF state, the potential of the second output terminal 102B is higher than the potential of the ground. The current supplied from the input terminal 103 to the second resistor 109B flows to the second output terminal 102B via the second signal line 108B, but does not flow to the ground. Therefore, an H-level (second level) output signal is output from the second output terminal 102B.

[0204] When the speed selector lever 12 is placed at the first position P1 so that the speed mode of the speed reduction mechanism 30 is switched to the high-speed mode, the first mode sensor 201 is turned on and the second mode sensor 202 is turned off, causing the first output terminal 102A to output an L-level output signal and the second output terminal 102B to output an H-level output signal.

[0205] When the speed selector lever 12 is placed at the second position P2 so that the speed mode of the speed reduction mechanism 30 is switched to the medium speed mode, the first mode sensor 201 is turned off and the second mode sensor 202 is turned off, causing the first output terminal 102A to output an H-level output signal and the second output terminal 102B to output an H-level output signal.

[0206] When the speed selector lever 12 is placed at the third position P3 so that the speed mode of the speed reduction mechanism 30 is switched to the low-speed mode, the first mode sensor 201 is turned OFF and the second mode sensor 202 is turned ON, causing the first output terminal 102A to output an H-level output signal and the second output terminal 102B to output an L-level output signal.

[0207] In this way, the combination of the level of the output signal output from the first output terminal 102A and the level of the output signal output from the second output terminal 102B changes based on the position of the speed switch lever 12. Therefore, the torque threshold setting circuit 176 of the controller board 17 can determine the speed mode of the reduction mechanism 30, which changes based on the position of the speed switch lever 12, based on the output signal from the first output terminal 102A and the output signal from the second output terminal 102B.

[0208] The level of the output signal refers to the intensity (electric potential) of the output signal. The value of the L level is, for example, 0. If the electric potential of the input terminal 103 is Vs, the value of the H level is, for example, Vs.

[0209] <Effects> As described above, in this embodiment, the driver drill 1 includes the speed reduction mechanism 30 that operates in each of a plurality of speed modes, the speed selector lever 12 that is moved to switch the speed mode, a plurality of mode sensors 200 that are arranged in the direction of movement of the speed selector lever 12 and detect the speed selector lever 12, the mode sensor board 100 that mounts the mode sensors 200 and has output terminals 102 that are connected to the mode sensors 200, and the controller board 17 that is connected to the output terminals 102 via output lead wires 104 and determines the speed mode based on the output signal output from the output terminals 102. The number of speed modes is three. The number of mode sensors 200 is equal to or less than the number of speed modes. In this embodiment, the number of mode sensors 200 is less than the number of speed modes.

[0210] In the above configuration, an increase in the number of output lead wires 104 is suppressed. The output terminals 102 of the mode sensor board 100 and the controller board 17 are connected via the output lead wires 104. The controller board 17 determines the speed mode of the reduction mechanism 30 based on the output signal output from the output terminals 102. There are three speed modes: high speed mode, medium speed mode, and low speed mode. When the number of mode sensors 200 is three or less, the number of output terminals 102 can be three or less. By suppressing an increase in the number of output terminals 102, an increase in the number of output lead wires 104 connecting the output terminals 102 and the controller board 17 is also suppressed.

[0211] In this embodiment, the number of mode sensors 200 is two, which is the number of speed modes minus one.

[0212] Since the number of mode sensors 200 is two, only two output lead wires 104 are required: a first output lead wire 104A and a second output lead wire 104B.

[0213] In this embodiment, the output terminals 102 are connected to the plurality of mode sensors 200 one by one.

[0214] In the above configuration, an output signal from one mode sensor 200 is transmitted to the controller board 17 via one output terminal 102 and one output lead wire 104.

[0215] In this embodiment, the mode sensor substrate 100 has an input terminal 103 connected to the mode sensor 200. A voltage is applied to the mode sensor 200 via the input terminal 103.

[0216] In the above configuration, the mode sensor 200 can be driven and output an output signal by a voltage applied via the input terminal 103 .

[0217] In this embodiment, the plurality of mode sensors 200 are connected in parallel to one another. Each of the plurality of mode sensors 200 is connected to the input terminal 103 via a power line 107.

[0218] In the above configuration, an increase in the number of input terminals 103 is suppressed.

[0219] In this embodiment, there is one input terminal 103.

[0220] The above configuration suppresses an increase in the number of input terminals 103. Also, only one input lead wire 105 is required.

[0221] In this embodiment, the speed selector lever 12 holds a permanent magnet 120. The mode sensor 200 includes a Hall sensor that detects the permanent magnet 120. Each of the multiple mode sensors 200 has a power supply port 211 to which current is supplied, a ground port 212 connected to the input terminal 103 via a resistor 109, and a ground port 213 connected to the ground.

[0222] In the above configuration, the mode sensor 200 can detect the position of the speed change lever 12 by detecting the magnetic field of the permanent magnet 120 held by the speed change lever 12 .

[0223] In this embodiment, the mode sensor 200 includes a first mode sensor 201 and a second mode sensor 202. The output terminal 102 includes a first output terminal 102A connected to the first mode sensor 201 and a second output terminal 102B connected to the second mode sensor 202. The resistor 109 includes a first resistor 109A connected to the first mode sensor 201 and a second resistor 109B connected to the second mode sensor 202. When the speed selector lever 12 is placed at the first position P1 to switch to the high-speed mode, an L-level output signal is output from the first output terminal 102A and an H-level output signal is output from the second output terminal 102B. When the speed selector lever 12 is placed at the second position P2 to switch to the medium-speed mode, an H-level output signal is output from the first output terminal 102A and an H-level output signal is output from the second output terminal 102B. When the speed selector lever 12 is placed in the third position P3 to switch to the low speed mode, an H-level output signal is output from the first output terminal 102A, and an L-level output signal is output from the second output terminal 102B.

[0224] In the above configuration, the combination of the level of the output signal output from the first output terminal 102A and the level of the output signal output from the second output terminal 102B changes based on the position of the speed switching lever 12. Therefore, the controller board 17 can determine the speed mode of the speed reduction mechanism 30, which changes based on the position of the speed switching lever 12.

[0225] In this embodiment, when the mode sensor 200 detects the permanent magnet 120, it enters an ON state in which the ground port 212 and the ground port 213 are connected, and when the mode sensor 200 does not detect the permanent magnet 120, it enters an OFF state in which the ground port 212 and the ground port 213 are not connected.

[0226] In the above configuration, the mode sensor 200 is turned ON when the permanent magnet 120 is detected, and is turned OFF when the permanent magnet 120 is not detected, so that the mode sensor 200 can detect the position of the permanent magnet 120.

[0227] In this embodiment, the first position P1 is defined rearward of the second position P2. The second position P2 is defined rearward of the third position P3. The first mode sensor 201 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1, and not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the second position P2 or the third position P3. The second mode sensor 202 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the third position P3, and not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1 or the second position P2.

[0228] In the above configuration, the level of the output signal output from the output terminal 102 changes based on the position of the permanent magnet 120.

[0229] In this embodiment, the driver drill 1 is equipped with a first planetary gear mechanism 31 having a motor 6, a rear stage consisting of a plurality of planetary gears 311P arranged around a pinion gear 31S rotated by the motor 6 and an internal gear 311R arranged around the plurality of planetary gears 311P, and a front stage consisting of a plurality of planetary gears 312P arranged around the pinion gear 31S and an internal gear 312R arranged around the plurality of planetary gears 312P, which has a different reduction ratio from the rear stage. The driver drill 1 is also equipped with a second planetary gear mechanism 32 arranged forward of the first planetary gear mechanism 31 and operated by the rotational force of the first planetary gear mechanism 31, a spindle 81 rotated by the rotational force of the motor 6 transmitted via the second planetary gear mechanism 32, and a housing 2 having a motor housing portion 21 that houses the motor 6. The driver drill 1 includes a first speed switching mechanism 71 that switches between a first deceleration mode in which rotation of the internal gear 312R is prevented but rotation of the internal gear 311R is allowed, and a second deceleration mode in which rotation of the internal gear 311R is prevented but rotation of the internal gear 312R is allowed, and a second speed switching mechanism 72 that switches between an enable mode in which rotation of the internal gear 32R of the second planetary gear mechanism 32 is prevented and an disable mode in which rotation of the internal gear 32R is allowed. The driver drill 1 also includes a speed switching lever 12 that can be moved to a first position P1, a second position P2, and a third position P3 with respect to the motor housing 21, and two mode sensors 200 that detect the position of the speed switching lever 12. When the speed switching lever 12 is located at the first position P1, the first planetary gear mechanism 31 is set to the second deceleration mode, and the second planetary gear mechanism 32 is set to the disable mode. When the speed selector lever 12 is located at the second position P2, the first planetary gear mechanism 31 is set to the first deceleration mode and the second planetary gear mechanism 32 is set to the inactive mode. When the speed selector lever 12 is located at the third position P3, the first planetary gear mechanism 31 is set to the first deceleration mode and the second planetary gear mechanism 32 is set to the active mode.

[0230] In the above configuration, when the speed selector lever 12 is located at the first position P1, the reduction mechanism 30 including the first planetary gear mechanism 31 and the second planetary gear mechanism 32 is set to the high-speed mode. When the speed selector lever 12 is located at the second position P2, the reduction mechanism 30 including the first planetary gear mechanism 31 and the second planetary gear mechanism 32 is set to the medium-speed mode. When the speed selector lever 12 is located at the third position P3, the reduction mechanism 30 including the first planetary gear mechanism 31 and the second planetary gear mechanism 32 is set to the low-speed mode. The two mode sensors 200 determine whether the reduction mechanism 30 is set to the high-speed mode, the medium-speed mode, or the low-speed mode. There are three speed modes. Since there are two mode sensors 200, an increase in the number of output lead wires 104 connected to the mode sensors 200 is suppressed.

[0231] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0232] <Speed ​​mode detection circuit> Fig. 26 is a diagram showing a speed mode detection circuit 101B according to this embodiment. Fig. 27 is a diagram for explaining the relationship between the position of the speed switch lever 12, the state of the mode sensor 200, and the output signal output from the output terminal 102 according to this embodiment.

[0233] As in the above-described embodiment, the multiple mode sensors 200 (201, 202) are connected in parallel to each other with respect to the input terminal 103. The multiple mode sensors 200 (201, 202) are connected in parallel to each other with respect to the ground section. Each of the multiple mode sensors 200 (201, 202) has a power supply port 211 to which current is supplied from the input terminal 103, a ground port 212 connected to the input terminal 103 via a resistor 109, and a ground port 213 connected to the ground section via a ground line 106.

[0234] There is one input terminal 103. Each of the multiple mode sensors 200 (201, 202) is connected to the input terminal 103 via a power line 107. The power port 211 of the first mode sensor 201 is connected to the input terminal 103 via a first power line 107A and the power line 107. The power port 211 of the second mode sensor 202 is connected to the input terminal 103 via a second power line 107B and the power line 107. The first power line 107A and the second power line 107B are connected in parallel to each other with respect to the input terminal 103. The power line 107 connects the input terminal 103 to each of the first power line 107A and the second power line 107B. A voltage is applied to the first mode sensor 201 via the input terminal 103, the power line 107, and the first power line 107A. A voltage is applied to the second mode sensor 202 via the input terminal 103, the power supply line 107, and the second power supply line 107B.

[0235] In this embodiment, there is one output terminal 102. The multiple mode sensors 200 (201, 202) are connected in parallel to each other to the output terminal 102. One output lead wire 104 is connected to one output terminal 102.

[0236] Each of the multiple mode sensors 200 (201, 202) is connected to an output terminal 102 via a signal line 108. One output terminal 102 is connected to the multiple mode sensors 200 (201, 202). The signal line 108 connects the output terminal 102 to each of the first mode sensor 201 and the second mode sensor 202. Each of the ground ports 212 of the first mode sensor 201 and the second mode sensor 202 is connected to the output terminal 102 via the signal line 108.

[0237] Each of the multiple mode sensors 200 (201, 202) is connected to the input terminal 103 via a resistor 109. The resistor 109 includes a first resistor 109A connected to the first mode sensor 201 and a second resistor 109B connected to the second mode sensor 202. The first resistor 109A is arranged to connect the power supply line 107 and the signal line 108. The second resistor 109B is arranged to connect the signal line 108 and the second mode sensor 202. A ground port 212 of the first mode sensor 201 is connected to the input terminal 103 via the signal line 108, the first resistor 109A, and the power supply line 107. A ground port 212 of the second mode sensor 202 is connected to the input terminal 103 via the second resistor 109B, the signal line 108, the first resistor 109A, and the power supply line 107.

[0238] Each of the multiple mode sensors 200 (201, 202) is connected to the ground via a ground line 106. The ground port 213 of the first mode sensor 201 is connected to the ground via a first ground line 106A and the ground line 106. The ground port 213 of the second mode sensor 202 is connected to the ground via a second ground line 106B and the ground line 106. The first ground line 106A and the second ground line 106B are connected in parallel to each other with respect to the ground. The ground line 106 connects the ground to each of the first ground line 106A and the second ground line 106B.

[0239] As in the above-described embodiment, the speed switch lever 12 is moved to a first position P1, a second position P2, and a third position P3. The first mode sensor 201 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1, and so as not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the second position P2 or the third position P3. The second mode sensor 202 is disposed so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the third position P3, and so as not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1 or the second position P2.

[0240] 27, when the speed switch lever 12 is placed at the first position P1, the first mode sensor 201 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed at least one of the second position P2 and the third position P3, the first mode sensor 201 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0241] 27, when the speed switch lever 12 is placed at the third position P3, the second mode sensor 202 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed at least one of the first position P1 and the second position P2, the second mode sensor 202 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0242] When the speed selector lever 12 is placed at the first position P1 so that the speed mode of the reduction gear mechanism 30 is switched to the high-speed mode, the first mode sensor 201 is turned on and the second mode sensor 202 is turned off. When the first mode sensor 201 is turned on, the potential of the first output terminal 102A is substantially equal to the potential of the ground. The current supplied from the input terminal 103 to the first resistor 109A flows to the ground via the first mode sensor 201, the first ground line 106A, and the ground line 106, but does not flow to the output terminal 102. The current supplied from the input terminal 103 to the first resistor 109A does not flow to the second resistor 109B or the second mode sensor 202. Therefore, an L-level (first level) output signal is output from the output terminal 102.

[0243] When the speed selector lever 12 is placed at the second position P2 so that the speed mode of the reduction gear mechanism 30 is switched to the medium speed mode, the first mode sensor 201 is turned off and the second mode sensor 202 is turned off. When the first mode sensor 201 is turned off, the potential of the output terminal 102 is higher than the potential of the ground. The current supplied from the input terminal 103 to the first resistor 109A flows to the output terminal 102 via the signal line 108, but does not flow to the ground. Therefore, an H-level (second level) output signal is output from the output terminal 102.

[0244] When the speed switch lever 12 is placed at the third position P3 so that the speed mode of the speed reduction mechanism 30 is switched to the low speed mode, the first mode sensor 201 is turned OFF and the second mode sensor 202 is turned ON.

[0245] 28 is a diagram illustrating a portion of the speed mode detection circuit 101B when the speed selector lever 12 according to the embodiment is located at the third position P3. When the first mode sensor 201 is in the OFF state and the second mode sensor 202 is in the ON state, as shown in FIG. 28, current supplied from the input terminal 103 to the first resistor 109A flows to the ground via the second resistor 109B, the second mode sensor 202, the second ground line 106B, and the ground line 106. In this case, an output signal having a voltage level obtained by dividing the resistance value R1 of the first resistor 109A and the resistance value R2 of the second resistor 109B is output from the output terminal 102. In other words, when the intensity (potential) of an H-level output signal is H, an output signal having a level of [R2 / (R1+R2)×H] is output from the output terminal 102.

[0246] In this way, the level of the output signal output from the output terminal 102 changes based on the position of the speed switch lever 12. Therefore, the torque threshold setting circuit 176 of the controller board 17 can determine the speed mode of the reduction mechanism 30, which changes based on the position of the speed switch lever 12, based on the output signal from the output terminal 102.

[0247] <Effects> As described above, in this embodiment, the driver drill 1 includes the speed reduction mechanism 30 that operates in each of a plurality of speed modes, the speed selector lever 12 that is moved to switch the speed mode, a plurality of mode sensors 200 that are arranged in the direction of movement of the speed selector lever 12 and detect the speed selector lever 12, the mode sensor board 100 that mounts the mode sensors 200 and has output terminals 102 that are connected to the mode sensors 200, and the controller board 17 that is connected to the output terminals 102 via output lead wires 104 and determines the speed mode based on the output signal output from the output terminals 102. The plurality of mode sensors 200 are connected in parallel to each other with respect to the output terminals 102. Each of the plurality of mode sensors 200 is connected to the output terminals 102 via a signal line 108.

[0248] The above configuration suppresses an increase in the number of output lead wires 104. In this embodiment, one output terminal 102 is connected to the speed mode detection circuit 101B, and the one output terminal 102 and the controller board 17 are connected via one output lead wire 104. The torque threshold setting circuit 176 of the controller board 17 determines the speed mode of the reduction mechanism 30 based on the output signal output from the one output terminal 102. By connecting the multiple mode sensors 200 connected in parallel to each other to the output terminals 102, an increase in the number of output terminals 102 is suppressed. By suppressing an increase in the number of output terminals 102, an increase in the number of output lead wires 104 connecting the output terminals 102 and the controller board 17 is suppressed.

[0249] In this embodiment, the mode sensor 200 includes a first mode sensor 201 and a second mode sensor 202. The resistor 109 includes a first resistor 109A connected to the first mode sensor 201 and a second resistor 109B connected to the second mode sensor 202. When the speed selector lever 12 is placed at a first position P1 to switch to the high-speed mode, an output signal of L level is output from the output terminal 102. When the speed selector lever 12 is placed at a second position P2 to switch to the medium-speed mode, an output signal of H level is output from the output terminal 102. When the speed selector lever 12 is placed at a third position P3 to switch to the low-speed mode, an output signal of a voltage level obtained by dividing the resistance value R1 of the first resistor 109A and the resistance value R2 of the second resistor 109B is output from the output terminal 102. In this embodiment, an output signal of a level [R2 / (R1+R2)×H] is output from the output terminal 102.

[0250] In the above configuration, the level of the output signal output from the output terminal 102 changes based on the position of the speed switching lever 12, so that the controller board 17 can determine the speed mode of the reduction mechanism 30, which changes based on the position of the speed switching lever 12.

[0251] [Third embodiment] A third embodiment will be described below. 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 of these components will be simplified or omitted.

[0252] <Speed ​​mode detection circuit> FIG. 29 is a diagram showing a speed mode detection circuit 101C according to this embodiment.

[0253] In this embodiment, the speed mode detection circuit 101C has three mode sensors 200. The mode sensors 200 include a first mode sensor 201, a second mode sensor 202, and a third mode sensor 203. There is one output terminal 102. There is one input terminal 103.

[0254] 29, the plurality of mode sensors 200 (201, 202, 203) are connected in parallel to the input terminal 103. The plurality of mode sensors 200 (201, 202, 203) are connected in parallel to the ground. The plurality of mode sensors 200 (201, 202, 203) are connected in parallel to the output terminal 102.

[0255] Each of the multiple mode sensors 200 (201, 202, 203) has a power port 211 to which current is supplied from the input terminal 103, a ground port 212 connected to the input terminal 103 via a resistor 109, and a ground port 213 connected to the ground section via a ground line 106.

[0256] Each of the multiple mode sensors 200 (201, 202, 203) is connected to the input terminal 103 via a power line 107. The power port 211 of the first mode sensor 201 is connected to the input terminal 103 via a first power line 107A and the power line 107. The power port 211 of the second mode sensor 202 is connected to the input terminal 103 via a second power line 107B and the power line 107. The power port 211 of the third mode sensor 203 is connected to the input terminal 103 via a third power line 107C and the power line 107. The first power line 107A, the second power line 107B, and the third power line 107C are connected in parallel with each other. The power line 107 connects one input terminal 103 to each of the first power line 107A, the second power line 107B, and the third power line 107C. A voltage is applied to the first mode sensor 201 via the input terminal 103, the power line 107, and the first power line 107A. A voltage is applied to the second mode sensor 202 via the input terminal 103, the power line 107, and the second power line 107B. A voltage is applied to the third mode sensor 203 via the input terminal 103, the power line 107, and the third power line 107C.

[0257] Each of the multiple mode sensors 200 (201, 202, 203) is connected to the output terminal 102 via a signal line 108. The signal line 108 connects one output terminal 102 to each of the first mode sensor 201, the second mode sensor 202, and the third mode sensor 203.

[0258] Each of the multiple mode sensors 200 (201, 202, 203) is connected to the input terminal 103 via a resistor 109. The resistor 109 includes a first resistor 109A connected to the first mode sensor 201, a second resistor 109B connected to the second mode sensor 202, and a third resistor 109C connected to the third mode sensor 203. The first resistor 109A is arranged to connect the power supply line 107 and the signal line 108. The second resistor 109B is arranged to connect the signal line 108 and the second mode sensor 202. The third resistor 109C is arranged to connect the signal line 108 and the third mode sensor 203.

[0259] The ground port 212 of the first mode sensor 201 is connected to the input terminal 103 via the signal line 108, the first resistor 109A, and the power supply line 107. The ground port 212 of the second mode sensor 202 is connected to the input terminal 103 via the second resistor 109B, the signal line 108, the first resistor 109A, and the power supply line 107. The ground port 212 of the third mode sensor 203 is connected to the input terminal 103 via the third resistor 109C, the signal line 108, the first resistor 109A, and the power supply line 107.

[0260] Each of the multiple mode sensors 200 (201, 202, 203) is connected to the ground via the ground line 106. The ground port 213 of the first mode sensor 201 is connected to the ground via the first ground line 106A and the ground line 106. The ground port 213 of the second mode sensor 202 is connected to the ground via the second ground line 106B and the ground line 106. The ground port 213 of the third mode sensor 203 is connected to the ground via the third ground line 106C and the ground line 106. The first ground line 106A, the second ground line 106B, and the third ground line 106C are connected in parallel with each other. The ground line 106 connects the ground to each of the first ground line 106A, the second ground line 106B, and the third ground line 106C.

[0261] Fig. 30 is a diagram for explaining the position of the speed switching lever 12 relative to the mode sensor board 100 according to this embodiment. Fig. 31 is a diagram for explaining the relationship between the position of the speed switching lever 12, the state of the mode sensor 200, and the output signal output from the output terminal 102 according to this embodiment.

[0262] As shown in Figure 30, the speed switch lever 12 is moved to a first position P1, a second position P2, a third position P3, and a fourth position P4. The first position P1 is located rearward of the second position P2. The second position P2 is located rearward of the third position P3. The third position P3 is located rearward of the fourth position P4. The first mode sensor 201 is located rearward of the second mode sensor 202. The second mode sensor 202 is located rearward of the third mode sensor 203.

[0263] When the speed switch lever 12 is located at the first position P1, the permanent magnet 120 faces the first mode sensor 201, but does not face the second mode sensor 202 or the third mode sensor 203. When the speed switch lever 12 is located at the second position P2, the permanent magnet 120 does not face the first mode sensor 201, the second mode sensor 202, or the third mode sensor 203. When the speed switch lever 12 is located at the second position P2, the permanent magnet 120 faces the space between the first mode sensor 201 and the second mode sensor 202. When the speed switch lever 12 is located at the third position P3, the permanent magnet 120 faces the second mode sensor 202, but does not face the first mode sensor 201 or the third mode sensor 203. When the speed selector lever 12 is located at the fourth position P4, the permanent magnet 120 faces the third mode sensor 203, but does not face the first mode sensor 201 or the second mode sensor 202.

[0264] The mode sensor 200 detects the permanent magnet 120 held by the speed switch lever 12 when the mode sensor 200 faces the permanent magnet 120. The first mode sensor 201 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1, and not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the second position P2, the third position P3, or the fourth position P4. The second mode sensor 202 is disposed on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the third position P3, and not to detect the permanent magnet 120 when the speed switch lever 12 is disposed at the first position P1, the second position P2, or the fourth position P4. The third mode sensor 203 is arranged on the mode sensor board 100 so as to detect the permanent magnet 120 when the speed switch lever 12 is positioned at the fourth position P4, and not to detect the permanent magnet 120 when the speed switch lever 12 is positioned at the first position P1, the second position P2, or the third position P3.

[0265] When the mode sensor 200 detects the permanent magnet 120, it enters an ON state in which the ground port 212 and the ground port 213 are connected, and when it does not detect the permanent magnet 120, it enters an OFF state in which the ground port 212 and the ground port 213 are not connected.

[0266] 31, when the speed switch lever 12 is placed at the first position P1, the first mode sensor 201 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed at least one of the second position P2, the third position P3, and the fourth position P4, the first mode sensor 201 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0267] 31, when the speed switch lever 12 is placed in the third position P3, the second mode sensor 202 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed in at least one of the first position P1, the second position P2, and the fourth position P4, the second mode sensor 202 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0268] 31, when the speed switch lever 12 is placed in the fourth position P4, the third mode sensor 203 detects the permanent magnet 120 and is therefore in the ON state. When the speed switch lever 12 is placed in at least one of the first position P1, the second position P2, and the third position P3, the second mode sensor 202 does not detect the permanent magnet 120 and is therefore in the OFF state.

[0269] When the speed selector lever 12 is positioned at the first position P1 so that the speed mode of the reduction gear mechanism 30 is switched to the high-speed mode, the first mode sensor 201 is turned on, and the second mode sensor 202 and the third mode sensor 203 are turned off. When the first mode sensor 201 is turned on, the potential of the first output terminal 102A is substantially equal to the potential of the ground. The current supplied from the input terminal 103 to the first resistor 109A flows to the ground via the first mode sensor 201, the first ground line 106A, and the ground line 106. However, the current does not flow to the output terminal 102. Furthermore, the current supplied from the input terminal 103 to the first resistor 109A does not flow to the second resistor 109B or the third resistor 109C. In other words, the current supplied from the input terminal 103 to the first resistor 109A does not flow to the second mode sensor 202 or the third mode sensor 203. As a result, an output signal of L level (first level) is output from output terminal 102.

[0270] When the speed selector lever 12 is placed at the second position P2 so that the speed mode of the reduction gear mechanism 30 is switched to the medium speed mode, the first mode sensor 201 is in the OFF state, the second mode sensor 202 is in the OFF state, and the third mode sensor 203 is in the OFF state. When the first mode sensor 201 is in the OFF state, the potential of the output terminal 102 is higher than the potential of the ground. The current supplied from the input terminal 103 to the first resistor 109A flows to the output terminal 102 via the signal line 108, but does not flow to the ground. Therefore, an H-level (second level) output signal is output from the output terminal 102.

[0271] When the speed selector lever 12 is placed at the third position P3 so that the speed mode of the speed reduction mechanism 30 is switched to the low-speed mode, the first mode sensor 201 is turned off, the second mode sensor 202 is turned on, and the third mode sensor 203 is turned off. A current supplied from the input terminal 103 to the first resistor 109A flows to the ground via the second resistor 109B, the second mode sensor 202, the second ground line 106B, and the ground line 106. In this case, an output signal having a voltage level determined by the resistance value R1 of the first resistor 109A and the resistance value R2 of the second resistor 109B is output from the output terminal 102. In other words, when the intensity (potential) of an H-level output signal is H, an output signal having a level of [R2 / (R1+R2)×H] is output from the output terminal 102.

[0272] When the speed selector lever 12 is placed in the fourth position P4 so that the speed mode of the speed reduction mechanism 30 is switched to an ultra-low speed mode, which is slower than the low speed mode, the first mode sensor 201 is turned OFF, the second mode sensor 202 is turned OFF, and the third mode sensor 203 is turned ON. A current supplied from the input terminal 103 to the first resistor 109A flows to the ground via the third resistor 109C, the third mode sensor 203, the third ground line 106C, and the ground line 106. In this case, an output signal having a voltage level obtained by dividing the resistance value R1 of the first resistor 109A and the resistance value R3 of the third resistor 109C is output from the output terminal 102. That is, when the intensity (potential) of an H-level output signal is H, an output signal having a level of [R3 / (R1+R3)×H] is output from the output terminal 102.

[0273] <Effects> As described above, in this embodiment as well, an increase in the number of output lead wires 104 is suppressed. In this embodiment, one output terminal 102 is connected to the speed mode detection circuit 101C, and the one output terminal 102 and the controller board 17 are connected via one output lead wire 104. The torque threshold setting circuit 176 of the controller board 17 determines the speed mode of the reduction mechanism 30 based on the output signal output from the one output terminal 102. By connecting the multiple mode sensors 200 connected in parallel to each other to the output terminals 102, an increase in the number of output terminals 102 is suppressed. By suppressing an increase in the number of output terminals 102, an increase in the number of output lead wires 104 connecting the output terminals 102 and the controller board 17 is suppressed.

[0274] [Other embodiments] In the above-described embodiment, the operating unit of the driver drill 1 is the speed reduction mechanism 30, and the speed mode of the speed reduction mechanism 30 is switched as the operating mode of the operating unit by moving the speed selector lever 12 as the operating member. The operating unit of the driver drill may be the motor 6, and the drive mode of the motor 6 may be switched as the operating mode of the operating unit by moving the forward / reverse rotation selector lever 11 as the operating member. The forward / reverse rotation selector lever 11 is movable among a left position (first position), a center position (second position), and a right position (third position). Moving the forward / reverse rotation selector lever 11 to the left position sets the drive mode of the motor 6 to the forward rotation mode, moving the forward / reverse rotation selector lever 11 to the center position prevents operation of the trigger lever 10 and sets the drive mode of the motor 6 to the stop mode, and moving the forward / reverse rotation selector lever 11 to the right position sets the drive mode of the motor 6 to the reverse rotation mode. A permanent magnet is fixed to the forward / reverse rotation switch lever 11, and a mode sensor board having at least two mode sensors that detect the permanent magnet is positioned opposite the forward / reverse rotation switch lever 11, so that the controller board 17 can determine the drive mode of the motor 6 based on the output signal output from the output terminal of the mode sensor board.

[0275] In the above-described embodiment, the mode sensor 200 is a Hall sensor that detects a permanent magnet held by an operating member. However, the mode sensor 200 may be a contact sensor that detects an operating member by contacting at least a portion of the operating member. Alternatively, the mode sensor 200 may be a tactile switch that detects an operating member by contacting at least a portion of the operating member. A tactile switch may be considered a contact sensor.

[0276] In the above-described embodiments, the number of mode sensors 200 may be equal to the number of operation modes. For example, as described in the first and second embodiments, if the number of speed modes (operation modes) is three, the number of mode sensors 200 may also be three. As described in the third embodiment, if the number of speed modes (operation modes) is four, the number of mode sensors 200 may also be four.

[0277] In the above-described embodiment, the battery pack 20 attached to the battery attachment section 5 is used as the power source for the driver drill 1. A commercial power source (AC power source) may also be used as the power source for the driver drill 1.

[0278] In the above-described embodiment, the electric work machine is a driver drill (percussion driver drill), which is a type of power tool. The power tool is not limited to a driver drill. Examples of the power tool include an impact driver, an angle drill, a screwdriver, a hammer, a hammer drill, a circular saw, and a reciprocating saw.

[0279] In the above-described embodiment, the electric work machine may be a gardening tool (outdoor power equipment). Examples of gardening tools include a chainsaw, a brush cutter, a lawn mower, a hedge trimmer, and a blower. [Explanation of symbols]

[0280] 1...Driver drill, 2...Housing, 2L...Left housing, 2R...Right housing, 2S...Screw, 3...Rear cover, 3S...Screw, 4...Casing, 4A...First casing, 4B...Second casing, 4C...Bracket plate, 4D...Stop plate, 4E...Screw, 4F...Screw, 4G...Guide groove, 4R...Reference symbol, 4S...Screw, 5...Battery mounting section, 6...Motor, 7...Power transmission mechanism, 8...Output section, 9...Fan, 10...Trigger lever, 10A...Trigger signal generation circuit, 11...Forward / reverse rotation switch lever, 11A...Forward / reverse rotation switch signal generation circuit, 12...Speed ​​switch lever, 13...Motor Mode switching ring, 13A...first symbol, 13B...second symbol, 13C...third symbol, 14...light, 15...interface panel, 16...dial, 16A...threshold signal generating circuit, 17...controller board, 18...air intake port, 19...air exhaust port, 20...battery pack, 21...motor housing section, 22...grip section, 23...battery holding section, 24...operation device, 25...display device, 26...controller case, 27...panel opening, 28...dial opening, 30...reduction mechanism, 31...first planetary gear mechanism, 31A...pin, 31C...first carrier, 31S...pinion gear, 32... Second planetary gear mechanism, 32A... pin, 32C... second carrier, 32D... recess, 32F... cam tooth, 32P... planetary gear, 32R... internal gear, 32S... sun gear, 33... third planetary gear mechanism, 33A... pin, 33C... third carrier, 33P... planetary gear, 33R... internal gear, 33S... sun gear, 34... speed switching member, 34A... ring portion, 34B... slider portion, 34C... lever portion, 34D... pin, 34E... protrusion, 34F... coil spring, 34G... coil spring, 35... annular member, 36... cam ring, 37... lever member, 38... gas Id rod, 39... coil spring, 40... vibration mechanism, 41... first cam, 42... second cam, 43... vibration switching ring, 43S... opposing portion, 43T... protrusion, 44... stop ring, 45... support ring, 46... steel ball, 47... washer, 48... cam ring, 50... spindle lock mechanism, 51... lock cam, 52... lock ring, 61... stator, 61A... stator core, 61B... front insulator, 61C... rear insulator, 61D... coil, 61E... short-circuit member, 62... rotor, 62A... rotor core, 62B... permanent magnet, 63... rotor shaft,64...bearing, 65...bearing, 71...first speed switching mechanism, 72...second speed switching mechanism, 81...spindle, 81F...flange portion, 81R...screw hole, 82...chuck, 83...bearing, 84...bearing, 87...coil spring, 90...rotation sensor board, 100...mode sensor board, 101...speed mode detection circuit, 101B...speed mode detection circuit, 101C...speed mode detection circuit, 102...output terminal, 102A...first output 102A...first output terminal, 102B...second output terminal, 103...input terminal, 104...output lead wire, 104A...first output lead wire, 104B...second output lead wire, 105...input lead wire, 106...ground wire, 106A...first ground wire, 106B...second ground wire, 106C...third ground wire, 107...power wire, 107A...first power wire, 107B...second power wire, 107C...third power wire, 108...signal wire, 108A...first signal wire, 108B... Second signal line, 109...resistor, 109A...first resistor, 109B...second resistor, 109C...third resistor, 120...permanent magnet, 121...recess, 171...motor control circuit, 172...motor drive circuit, 173...voltage adjustment circuit, 174...torque estimation circuit, 175...correlation data storage circuit, 176...torque threshold setting circuit, 200...mode sensor, 201...first mode sensor, 202...second mode sensor, 203...third mode sensor, 2 11...power port, 212...ground port, 213...ground port, 250...cam pin, 250A...groove, 311P...planetary gear, 312P...planetary gear, 311R...internal gear, 311F...cam tooth, 312R...internal gear, 311S...large diameter portion, 312F...cam tooth, 312S...small diameter portion, 1000...control system, AX...rotating axis, P1...first position, P2...second position, P3...third position, P4...fourth position.

Claims

1. an operating unit that operates in each of a plurality of operating modes; an operating member that is moved to switch the operation mode; a plurality of mode sensors disposed in a moving direction of the operation member and detecting the operation member; a mode sensor substrate on which the mode sensor is mounted and which has an output terminal connected to the mode sensor and an input terminal connected to the mode sensor; a controller board connected to the output terminal via an output lead wire and configured to determine the operation mode based on an output signal output from the output terminal; the number of operating modes is at least three; the number of mode sensors is less than or equal to the number of operating modes; Each of the plurality of mode sensors has a power supply port to which a current is supplied, a ground port connected to the input terminal via a resistor, and a ground port connected to a ground portion. Electric work equipment.

2. the number of mode sensors is the number of operation modes minus one; The electric operating machine according to claim 1 .

3. the output terminals are connected to the plurality of mode sensors one by one; The electric operating machine according to claim 1 or 2.

4. A voltage is applied to the mode sensor via the input terminal. The electric operating machine according to claim 3.

5. The plurality of mode sensors are connected in parallel with each other, Each of the plurality of mode sensors is connected to the input terminal via a power supply line. The electric operating machine according to claim 4.

6. The input terminal is one. The electric operating machine according to claim 5.

7. The operating member holds a permanent magnet, the mode sensor includes a Hall sensor that detects the permanent magnet; The electric operating machine according to any one of claims 4 to 6.

8. the mode sensor includes a first mode sensor and a second mode sensor; the output terminals include a first output terminal connected to the first mode sensor and a second output terminal output to the second mode sensor; the resistors include a first resistor connected to the first mode sensor and a second resistor connected to the second mode sensor; When the operating member is placed at a first position to switch to a first operation mode, an output signal of a first level is output from the first output terminal, and an output signal of a second level is output from the second output terminal; When the operating member is placed in a second position to switch to a second operation mode, an output signal of a second level is output from the first output terminal, and an output signal of a second level is output from the second output terminal; When the operating member is placed in a third position to switch to a third operation mode, an output signal of a second level is output from the first output terminal, and an output signal of a first level is output from the second output terminal. The electric operating machine according to claim 7.

9. The plurality of mode sensors are connected in parallel with each other, Each of the plurality of mode sensors is connected to the output terminal via a signal line. The electric operating machine according to claim 1 or 2.

10. an operating unit that operates in each of a plurality of operating modes; an operating member that is moved to switch the operation mode; a plurality of mode sensors disposed in a moving direction of the operation member and detecting the operation member; a mode sensor substrate on which the mode sensor is mounted and which has an output terminal connected to the mode sensor and an input terminal connected to the mode sensor; a controller board connected to the output terminal via an output lead wire and configured to determine the operation mode based on an output signal output from the output terminal; The plurality of mode sensors are connected in parallel with each other, each of the plurality of mode sensors has a power supply port to which a current is supplied, a ground port connected to the input terminal via a resistor, and a ground port connected to a ground portion, and is connected to the output terminal via a signal line; Electric work equipment.

11. The output terminal is one. The electric operating machine according to claim 9 or 10.

12. A voltage is applied to the mode sensor via the input terminal. The electric operating machine according to any one of claims 9 to 11.

13. Each of the plurality of mode sensors is connected to the input terminal via a power supply line. The electric operating machine according to claim 12.

14. The input terminal is one. The electric operating machine according to claim 13.

15. The operating member holds a permanent magnet, the mode sensor includes a Hall sensor that detects the permanent magnet; The electric operating machine according to any one of claims 12 to 14.

16. the mode sensor includes a first mode sensor and a second mode sensor; the resistors include a first resistor connected to the first mode sensor and a second resistor connected to the second mode sensor; When the operating member is placed in a first position to switch to a first operation mode, an output signal of a first level is output from the output terminal; When the operating member is placed in a second position to switch to a second operation mode, an output signal of a second level is output from the output terminal; When the operating member is placed in a third position to switch to a third operation mode, an output signal having a voltage level divided by the resistance value of the first resistor and the resistance value of the second resistor is output from the output terminal. The electric operating machine according to claim 15.

17. When the mode sensor detects the permanent magnet, it is in an ON state in which the ground port and the ground port are connected, and when the mode sensor does not detect the permanent magnet, it is in an OFF state in which the ground port and the ground port are not connected. The electric operating machine according to claim 8 or 16.

18. the first position is defined rearward of the second position, the second position is defined rearward of the third position, the first mode sensor is disposed so as to detect the permanent magnet when the operating member is disposed at the first position, and so as not to detect the permanent magnet when the operating member is disposed at the second position and the third position; the second mode sensor is disposed so as to detect the permanent magnet when the operating member is disposed at the third position, and so as not to detect the permanent magnet when the operating member is disposed at the first position and the second position. The electric operating machine according to claim 17.

19. A motor; an output section to which a tool tip is attached; a speed reduction mechanism that rotates the output portion at a rotational speed lower than that of the motor, the operating unit includes the speed reduction mechanism, the operation mode includes a speed mode of the reduction mechanism; the operating member is moved so that the speed mode is switched between a high speed mode, a medium speed mode, and a low speed mode; The electric operating machine according to any one of claims 1 to 18.

20. A motor, an output section to which a tool tip is attached; an operating unit that operates in each of a plurality of operating modes; an operating member that is moved to switch the operation mode; a plurality of mode sensors disposed in a moving direction of the operation member and detecting the operation member; a mode sensor substrate on which the mode sensor is mounted and which has an output terminal connected to the mode sensor; a controller board connected to the output terminal via an output lead wire and configured to determine the operation mode based on an output signal output from the output terminal; an operating device that is operated to change the drive mode of the motor between a drill mode in which the motor is driven regardless of the torque acting on the motor, and a clutch mode in which the motor is stopped when the torque acting on the motor exceeds a torque threshold; a dial that is operated to change the torque threshold in the clutch mode, the number of operating modes is at least three; the number of mode sensors is less than or equal to the number of operating modes; the operating unit is a speed reduction mechanism that rotates the output unit at a rotational speed lower than that of the motor, the operation mode includes a speed mode of the reduction mechanism; the operating member is moved so that the speed mode is switched among a high speed mode, a medium speed mode, and a low speed mode; the controller board stops the motor in the clutch mode when the torque acting on the motor exceeds the set torque threshold value based on the detection data of the mode sensor; With respect to the input value of the torque threshold, the set value of the torque threshold is set to a different value in a high speed mode, a medium speed mode, and a low speed mode. Electric work equipment.

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