Driver drill and vibration driver drill

Abstract

To inhibit size increase of a driver drill and hold a lead wire connected to an element properly.SOLUTION: A driver drill includes: a motor; an output part which is provided in front of the motor and driven by the motor; a speed reduction mechanism disposed between the motor and the output part; a motor bracket disposed between the motor and the speed reduction mechanism; a housing which houses the motor and the motor bracket; an element provided above the motor or the speed reduction mechanism; and a lead wire connected to the element and extending to the lower side relative to the motor or the speed reduction mechanism. The lead wire is sandwiched between the housing and the motor bracket.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a driver drill and a percussion driver drill. [Background technology]

[0002] 2. Description of the Related Art In the technical field relating to driver drills, a driver drill as disclosed in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-171857 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in this specification aims to appropriately hold lead wires connected to an element while suppressing an increase in the external dimensions. [Means for solving the problem]

[0005] This specification discloses a driver drill. The driver drill may include a motor, an output section provided in front of the motor and driven by the motor, a reduction mechanism disposed between the motor and the output section, a motor bracket disposed between the motor and the reduction mechanism, a housing that accommodates the motor and the motor bracket, an element provided above the motor or the reduction mechanism, and a lead wire connected to the element and extending below the motor or the reduction mechanism. The lead wire may be sandwiched between the housing and the motor bracket.

[0006] This specification also discloses a percussion driver drill. The percussion driver drill may include a motor, an output section provided in front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output section, a vibration mechanism disposed between the speed reduction mechanism and the output section, a motor bracket disposed between the motor and the speed reduction mechanism, a housing that accommodates the motor and the motor bracket, an element provided above the motor or the speed reduction mechanism, and a lead wire connected to the element and extending below the motor. The lead wire may be held by the motor bracket.

[0007] The percussion driver drill may also include a motor, an output section provided in front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output section, a vibration mechanism disposed between the output section and the speed reduction mechanism, a housing that accommodates the motor and the speed reduction mechanism, an element provided above the motor and the speed reduction mechanism, and a controller provided below the motor and connected to the element via a lead wire. A passage for passing the lead wire may be provided between the motor and the speed reduction mechanism in the front-rear direction. Effect of the Invention

[0008] According to the technology disclosed in this specification, it is possible to appropriately hold the lead wires connected to the element while suppressing an increase in the external dimensions. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a front perspective view showing a driver drill according to an embodiment. [Diagram 2] FIG. 2 is a rear perspective view showing the driver drill according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing a driver drill according to an embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a part of the driver drill according to the embodiment. [Diagram 5] FIG. 5 is an exploded perspective view showing the motor, the motor bracket, and the reduction mechanism according to the embodiment, as seen from the rear. [Figure 6] FIG. 6 is a rear perspective view showing a part of the reduction mechanism according to the embodiment. [Figure 7] FIG. 7 is an exploded perspective view showing the reduction mechanism according to the embodiment, as seen from the rear. [Figure 8] FIG. 8 is an exploded perspective view showing the reduction mechanism according to the embodiment, as viewed from the front. [Figure 9] FIG. 9 is a cross-sectional view from above showing the moving structure of the speed change lever according to the embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing the vibration mechanism according to the embodiment. [Figure 11] FIG. 11 is a rear perspective view showing the left housing and the motor bracket according to the embodiment. [Figure 12] FIG. 12 is a rear perspective view showing the motor bracket according to the embodiment. [Figure 13] FIG. 13 is a perspective view showing a part of the left housing according to the embodiment. [Figure 14] FIG. 14 is a cross-sectional view taken along an arrow from rear to front, showing a passage of a lead wire according to the embodiment. [Figure 15] FIG. 15 is a front perspective view showing the driver drill with the handle attached according to the embodiment. [Figure 16] FIG. 16 is a perspective explanatory view showing a mounting portion of the handle according to the embodiment. [Figure 17] FIG. 17 is a cross-sectional view taken along an arrow from rear to front, illustrating engagement between the handle and the mounting portion according to the embodiment. [Figure 18] FIG. 18 is a schematic diagram showing an element according to another embodiment. [Figure 19] FIG. 19 is a schematic diagram showing an element according to another embodiment. [Figure 20] FIG. 20 is a perspective view showing a motor bracket according to another embodiment. [Figure 21] FIG. 21 is a left side view showing a motor bracket according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In one or more embodiments, the driver drill may include a motor, an output section provided in front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output section, a motor bracket disposed between the motor and the speed reduction mechanism, a housing that accommodates the motor and the motor bracket, an element provided above the motor or the speed reduction mechanism, and a lead wire connected to the element and extending below the motor or the speed reduction mechanism. The lead wire may be sandwiched between the housing and the motor bracket.

[0011] In the above configuration, the lead wires connected to the element are appropriately held while preventing the outside dimensions from becoming large.

[0012] In one or more embodiments, the driver drill may have a recess in the inner surface of the housing in which the lead wires are disposed.

[0013] In the above-described configuration, the positional deviation of the lead wires is effectively suppressed.

[0014] In one or more embodiments, the driver drill may have a protrusion on the outer periphery of the motor bracket that protrudes toward the recess.

[0015] In the above configuration, the positional deviation of the lead wire between the concave portion and the convex portion is more effectively suppressed.

[0016] In one or more embodiments, the protrusion may include a first protrusion and a second protrusion along a circumferential direction of the motor bracket, and a distance from the rotation shaft of the motor to a tip of the first protrusion in a radial direction from the rotation shaft may be smaller than a distance from the rotation shaft to a tip of the second protrusion.

[0017] In the above configuration, even if a convex portion is provided, the outer shape of the housing is unlikely to become large at the position where the first convex portion is formed, so that an increase in the size of the driver drill is suppressed.

[0018] In one or more embodiments, the first protrusion may be disposed on a side surface of the motor bracket, and the second protrusion may be disposed above or below the first protrusion on the motor bracket.

[0019] With the above configuration, the width dimension of the driver drill is reduced.

[0020] In one or more embodiments, the driver drill may further include a vibration mechanism that vibrates the output portion.

[0021] The above-mentioned configuration enables drilling using vibration. Even when vibration is used, displacement of the lead wire caused by the vibration is effectively suppressed.

[0022] In one or more embodiments, the reduction mechanism may be a multi-speed variable speed. The driver drill may further include a speed change lever disposed on an upper portion of the housing for changing a reduction ratio of the reduction mechanism. The element may include a sensor for detecting the change of the reduction ratio by the speed change lever.

[0023] The above configuration holds the leads that connect to the sensor in place on the top of the housing.

[0024] In one or more embodiments, the element may include an indicator lamp that indicates the operating status of the motor.

[0025] In the above configuration, the lead wire connected to the notification lamp is properly held.

[0026] In one or more embodiments, the element may include an operational switch that accepts operational input.

[0027] In the above configuration, the lead wires connected to the operation switch are properly held.

[0028] In one or more embodiments, the percussion driver drill may include a motor, an output section provided in front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output section, a vibration mechanism disposed between the speed reduction mechanism and the output section, a motor bracket disposed between the motor and the speed reduction mechanism, a housing that accommodates the motor and the motor bracket, an element provided above the motor or the speed reduction mechanism, and a lead wire connected to the element and extending below the motor. The lead wire may be held by the motor bracket.

[0029] With the above-mentioned configuration, the lead wires connected to the element are appropriately held while preventing an increase in the overall dimensions. Even when the element is subjected to vibration, displacement of the lead wires due to vibration is effectively prevented.

[0030] In one or more embodiments, the percussion driver drill may include a motor, an output section provided in front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output section, a vibration mechanism disposed between the output section and the speed reduction mechanism, a housing that accommodates the motor and the speed reduction mechanism, an element provided above the motor and the speed reduction mechanism, and a controller provided below the motor and connected to the element via a lead wire. A passage for passing the lead wire may be provided between the motor and the speed reduction mechanism in the front-rear direction.

[0031] With the above-mentioned configuration, the lead wires connected to the element are appropriately held while preventing an increase in the overall dimensions. Even when the element is subjected to vibration, displacement of the lead wires due to vibration is effectively prevented.

[0032] In one or more embodiments, the percussion driver drill may further include a motor bracket disposed between the motor and the reduction mechanism and for positioning the motor and the reduction mechanism. The passage may be provided between the motor bracket and a housing surrounding an outer periphery of the motor bracket.

[0033] In the above configuration, the lead wire passage is constructed without increasing the number of parts.

[0034] Hereinafter, an embodiment 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 appropriately combined. In addition, some components may not be used.

[0035] In the embodiment, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate a relative position or direction based on the center of the driver drill.

[0036] The driver drill has a motor. In the embodiments, a direction parallel to a rotation axis AX of the motor is referred to as an axial direction, a direction going around the rotation axis AX is referred to as a circumferential direction or a rotation direction, and a radial direction of the rotation axis AX is referred to as a radial direction.

[0037] In the embodiment, the rotation axis AX extends in the front-rear direction. The axial direction and the front-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 a direction approaching the rotation axis AX is appropriately referred to as the radial inner side, and a position farther from or a direction away from the rotation axis AX is appropriately referred to as the radial outer side.

[0038] [Driver Drill Overview] Fig. 1 is a front perspective view of the driver drill 1 according to the embodiment. Fig. 2 is a rear perspective view of the driver drill 1 according to the embodiment. Fig. 3 is a cross-sectional view of the driver drill according to the embodiment. In the embodiment, the driver drill 1 is a vibration driver drill. Fig. 4 is a cross-sectional view of a part of the driver drill 1 according to the embodiment.

[0039] 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 change lever 12, a mode change ring 13, an interface panel 15, a dial 16, and a controller 17.

[0040] 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 by a screw 2S. The housing 2 is formed by fixing the left housing 2L and the right housing 2R together.

[0041] The housing 2 has a motor accommodating portion 21, a grip portion 22, and a battery holding portion 23.

[0042] The motor accommodating portion 21 accommodates the motor 6. The motor accommodating portion 21 is cylindrical. The motor accommodating portion 21 is disposed so as to cover the periphery of the motor 6.

[0043] The grip portion 22 is held by an operator. The grip portion 22 is disposed below the motor accommodating portion 21. The grip portion 22 extends downward from the motor accommodating portion 21. The trigger lever 10 is disposed in front of the grip portion 22.

[0044] The battery holding part 23 houses the controller 17. The battery holding part 23 is disposed at the lower part of the grip part 22. The battery holding part 23 is connected to the lower end part of the grip part 22. The outer dimensions of the battery holding part 23 are larger than the outer dimensions of the grip part 22 in both the front-rear direction and the left-right direction.

[0045] The rear cover 3 is made of synthetic resin. The rear cover 3 is disposed behind the motor accommodating portion 21. The rear cover 3 is disposed so as to cover the rear portion of the motor 6. The rear cover 3 accommodates a fan 9. The rear cover 3 is disposed so as to cover the opening at the rear of the motor accommodating portion 21. The rear cover 3 is fixed to the motor accommodating portion 21 by screws 3S. The motor accommodating portion 21 and the rear cover 3 are surrounding members that cover the periphery and rear portion of the motor 6. The motor accommodating portion 21 and the rear cover 3 may be integral with each other.

[0046] The motor accommodating portion 21 has an intake port 18. The rear cover 3 has an exhaust port 19. Air in the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 18. Air in the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 19.

[0047] The casing 4 houses the power transmission mechanism 7. The casing 4 includes a first casing 4A, a second casing 4B, and a motor bracket 4C. 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 and the motor bracket 4C are made of synthetic resin. The second casing 4B is made of metal. In the embodiment, the second casing 4B is made of aluminum. The casing 4 is connected to the front of the motor accommodating portion 21. Each of the first casing 4A and the second casing 4B is cylindrical.

[0048] The first casing 4A is fixed to the rear end of the second casing 4B. The motor bracket 4C is arranged so as to cover the opening at the rear end of the first casing 4A. The motor bracket 4C is fixed to the rear end of the first casing 4A by screws 4E. A stop plate 4D is provided at the front end of the second casing 4B. The stop plate 4D is arranged so as 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 by screws 4F.

[0049] The casing 4 is disposed so as to cover the opening at the front 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 screws 4S.

[0050] The battery mounting section 5 is formed at the bottom of the battery holding section 23. The battery mounting section 5 is connected to the battery pack 20. The battery pack 20 is mounted to the battery mounting section 5. The battery pack 20 is detachable from the battery mounting section 5. The battery pack 20 includes a secondary battery. In the embodiment, the battery pack 20 includes a rechargeable lithium ion battery. When mounted to the battery mounting 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 17 operate based on the power supplied from the battery pack 20.

[0051] The motor 6 is a power source of 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.

[0052] 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.

[0053] The power transmission mechanism 7 includes a reduction mechanism 30 and a vibration mechanism 40 .

[0054] The reduction mechanism 30 reduces the rotation speed of the rotor 62 (rotor shaft 63) and rotates the output section 8 at a lower rotation speed than the rotor 62. In the 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 part 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.

[0055] 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.

[0056] The output unit 8 is disposed forward of the motor 6. The output unit 8 rotates due to the rotational force of the rotor 62. The output unit 8 rotates with the tool tip attached based on the rotational force transmitted from the rotor 62 via the power transmission mechanism 7. The output unit 8 has a spindle 81 that rotates about the rotation axis AX based on the rotational force transmitted from the rotor 62, and a chuck 82 attached to the front end of the spindle 81. The tool tip is held by the chuck 82. The front end of the chuck 82 is disposed forward of the casing 4. At least a part of the spindle 81 is disposed forward of the third planetary gear mechanism 33. The spindle 81 is connected to the third planetary gear mechanism 33. The spindle 81 rotates due to the rotational force of the rotor 62 transmitted via the first planetary gear mechanism 31, the second planetary gear mechanism 32, and the third planetary gear mechanism 33.

[0057] The fan 9 is disposed behind the motor 6. The fan 9 generates an airflow for cooling the motor 6. The fan 9 is fixed to 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 in 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 through the exhaust 19 to the external space of the housing 2.

[0058] The trigger lever 10 is operated to start the motor 6. The trigger lever 10 is provided on the upper part of the grip portion 22. The front end of the trigger lever 10 protrudes forward from the front of the grip portion 22. The trigger lever 10 is movable in the front-rear direction. The trigger lever 10 is operated by the operator. When the trigger lever 10 is operated so as to move backward, the motor 6 is started. When the operation of the trigger lever 10 is released, the motor 6 is stopped.

[0059] 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 an 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.

[0060] The speed change lever 12 is operated to change the speed mode (gear stage) of the reduction mechanism 30. The speed change lever 12 is provided on the upper part of the motor accommodating section 21. The speed change lever 12 is movable in the front-rear direction. The speed change lever 12 is operated by an operator. The speed modes (gear stages) of the reduction mechanism 30 include a low-speed mode (first speed), a medium-speed mode (second speed), and a high-speed mode (third speed). In other words, the number of gear stages of the reduction mechanism 30 is three. The reduction mechanism 30 is a three-speed reduction mechanism.

[0061] The low-speed mode refers to a speed mode in which the output unit 8 is rotated at a first rotation speed (low speed) while the rotor 62 is rotating at a constant rotation speed. The medium-speed mode refers to a speed mode in which the output unit 8 is rotated at a second rotation speed (medium speed) higher than the first rotation speed while the rotor 62 is rotating at a constant rotation speed. The high-speed mode refers to a speed mode in which the output unit 8 is rotated at a third rotation speed (high speed) higher than the second rotation speed while the rotor 62 is rotating at a constant rotation speed. The movable range of the speed switching lever 12 is specified in the front-rear direction. The speed mode of the reduction mechanism 30 is set to the low-speed mode by operating the speed switching lever 12 to move to the front part of the movable range. The speed mode of the reduction mechanism 30 is set to the medium-speed mode by operating the speed switching lever 12 to move to the middle part of the movable range. The speed mode of the reduction mechanism 30 is set to the high-speed mode by operating the speed switching lever 12 to move to the rear part of the movable range.

[0062] The mode switching ring 13 is operated to change the working 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 working modes of the vibration mechanism 40 include a vibration mode and a non-vibration mode. The vibration mode refers to a working mode in which the output unit 8 is vibrated in the axial direction. The non-vibration mode refers to a working mode in which the output unit 8 is not vibrated in the axial direction. The working mode of the vibration mechanism 40 is set to the vibration mode by operating the mode switching ring 13 to be disposed in the vibration mode position in the rotational direction. The working mode of the vibration mechanism 40 is set to the non-vibration mode by operating the mode switching ring 13 to be disposed in the non-vibration mode position in the rotational direction.

[0063] The interface panel 15 is provided in the battery holding section 23. The interface panel 15 includes an operation device 24 and a display device 25. The interface panel 15 is plate-shaped. The operation 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.

[0064] 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.

[0065] 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 refers to 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 refers to a drive mode in which the motor 6 is stopped when the torque acting on the motor 6 when the motor 6 is driven exceeds a current threshold.

[0066] 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 through 360° or more. The dial 16 is operated by an operator. The driving conditions of the motor 6 include a current threshold. The dial 16 is operated to change the current threshold in the clutch mode set by the operating device 24.

[0067] 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 .

[0068] The controller 17 includes a computer system. The controller 17 outputs a control command to control the motor 6. At least a part of the controller 17 is housed in a controller case 26. The controller 17 is housed in a battery holding section 23 while being held in the controller case 26. The controller 17 includes a circuit board on which a plurality of electronic components are mounted. Examples of the 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.

[0069] The controller 17 sets the drive conditions of the motor 6 based on the operation of the dial 16. As described above, the drive conditions of the motor 6 include a current threshold. In the clutch mode, the controller 17 sets the current threshold based on the operation of the dial 16.

[0070] Furthermore, in the clutch mode, the controller 17 stops the motor 6 when the torque acting on the motor 6 during driving of the motor 6 exceeds a set current threshold value.

[0071] Moreover, the controller 17 causes the display device 25 to display the set driving conditions of the motor 6.

[0072] [Motor and power transmission mechanism] 4, 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.

[0073] The stator 61 includes a stator core 61A including a plurality of laminated 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, a sensor circuit board attached to the front insulator 61B, and a short-circuit member supported by the front insulator 61B. The sensor circuit board has a plurality of rotation detection elements that detect the rotation of the rotor 62. The rotation detection elements of the sensor circuit board detect the rotation of the rotor 62 by detecting the magnetic field of the permanent magnet 62B. The controller 17 supplies a drive current to the coil 61D based on the detection data of the rotation detection elements. The short-circuit member connects the plurality of coils 61D via a fusing terminal. The short-circuit member is connected to the controller 17 via a lead wire.

[0074] 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 a through hole 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.

[0075] The rotor shaft 63 rotates about 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 motor bracket 4C disposed in front of the stator 61. The bearing 65 is held by the rear cover 3. A front end portion of the rotor shaft 63 is disposed forward of the bearing 64. A front end portion of the rotor shaft 63 is disposed in the internal space of the casing 4.

[0076] 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.

[0077] FIG. 5 is an exploded perspective view from the rear showing the motor 6, the motor bracket 4C, and the reduction mechanism 30 according to the embodiment. The motor bracket 4C is disposed between the motor 6 and the reduction mechanism 30. The rotor shaft 63 of the motor 6 passes through the motor bracket 4C and connects to the reduction mechanism 30 (pinion gear 31S). The spindle 81 is disposed in front of the reduction mechanism 30. The spindle 81 is coupled to the third carrier 33C of the reduction mechanism 30. In the embodiment, a pair of flat surfaces 81T is formed on the outer circumferential surface of the spindle 81. The flat surface 81T is parallel to the rotation axis AX. The pair of flat surfaces 81T face in opposite directions. The third carrier 33C is disposed around the spindle 81. The inner circumferential surface of the third carrier 33C includes a support surface that contacts each of the pair of flat surfaces 81T. The flat surface 81T suppresses the relative rotation between the third carrier 33C and the spindle 81. As the third carrier 33C rotates, the spindle 81 rotates together with the third carrier 33C.

[0078] 4, the spindle 81 is rotatably supported by a bearing 83 and a bearing 84. While being supported by the bearing 83 and the bearing 84, the spindle 81 is movable in the front-rear direction.

[0079] The spindle 81 has a flange portion 81F. A coil spring 87 is disposed between the flange portion 81F and a bearing 83. The flange portion 81F contacts a front end portion of the coil spring 87. The coil spring 87 generates an elastic force that moves the spindle 81 forward.

[0080] 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. The chuck 82 rotates as the spindle 81 rotates. The chuck 82 rotates while holding the tool bit.

[0081] FIG. 6 is a rear perspective view showing a part of the reduction mechanism 30 according to the embodiment.

[0082] The speed change lever 12 is operated to change the speed mode of the reduction mechanism 30. The speed change lever 12 is mechanically connected to the reduction mechanism 30. The speed change lever 12 is provided above the casing 4 (see FIG. 1). The speed change lever 12 is movable in the front-rear direction. The speed change lever 12 is operated by an operator. The speed modes of the reduction mechanism 30 include a low-speed mode (first speed), a medium-speed mode (second speed), and a high-speed mode (third speed). When the speed change lever 12 is operated to move to the front of its movable range, the speed mode of the reduction mechanism 30 is set to the low-speed mode (first speed). When the speed change lever 12 is operated to move to the middle of its movable range, the speed mode of the reduction mechanism 30 is set to the medium-speed mode (second speed). When the speed change lever 12 is operated to move to the rear of its movable range, the speed mode of the reduction mechanism 30 is set to the high-speed mode (third speed).

[0083] Fig. 7 is an exploded rear perspective view of the speed reduction mechanism according to the embodiment. Fig. 8 is an exploded front perspective view of the speed reduction mechanism according to the embodiment. The sun gears 32S and 33S are illustrated as cylindrical with their teeth simplified.

[0084] The first planetary gear mechanism 31 includes a planetary gear 311P, a planetary gear 312P disposed forward of the planetary gear 311P, a first stage carrier 311C supporting each of the planetary gears 311P and the planetary gears 312P, a second stage carrier 312C supporting each of the planetary gears 312P, an internal gear 311R disposed around the planetary gears 311P, and an internal gear 312R disposed around the planetary gears 312P. 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 disposed on the front side of the stator 61. The pinion gear 31S is rotated by the rotor 62. The pinion gear 31S may be rotated by the rotor 62 either directly or indirectly.

[0085] The second planetary gear mechanism 32 includes 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 on the front side of the internal gear 311R and the internal gear 312R. The sun gear 32S may be directly or indirectly rotated by the planetary gears 311P and the planetary gears 312P. The planetary gear 32P meshes with the sun gear 32S. The internal gear 32R meshes with the planetary gear 32P.

[0086] 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 supporting the plurality of planetary gears 33P, and an internal gear 33R arranged around the plurality of planetary gears 33P.

[0087] The first planetary gear mechanism 31 includes a plurality of planetary gears 311P disposed around the large diameter portion 311S of the pinion gear 31S. The first planetary gear mechanism 31 includes a plurality of planetary gears 312P disposed around the small diameter portion 312S of the pinion gear 31S.

[0088] The casing 4 accommodates the pinion gear 31S, the planetary gear 311P, the planetary gear 312P, the internal gear 311R, the internal gear 312R, the sun gear 32S, and the planetary gear 32P. The spindle 81 is disposed in front of the internal gear 33R. The spindle 81 may be directly or indirectly rotated by the planetary gear 33P.

[0089] The planetary gear 311P is rotatably supported by the first pin 311A. The first pin 311A ​​is supported by the first stage carrier 311C. The first pin 311A ​​protrudes rearward from the rear surface of the first stage carrier 311C. A plurality of the first pins 311A ​​are provided at intervals in the circumferential direction. In the embodiment, four first pins 311A ​​are provided at equal intervals in the circumferential direction. The planetary gear 311P is supported by each of the plurality (four) of first pins 311A. The planetary gear 311P is disposed rearward of the first stage carrier 311C. The first stage carrier 311C rotatably supports the planetary gear 311P via the first pins 311A.

[0090] The planetary gear 312P is rotatably supported by the second pin 312A. The second pin 312A is supported by each of the first stage carrier 311C and the second stage carrier 312C. The first stage carrier 311C is disposed rearward of the second stage carrier 312C. The rear end of the second pin 312A is supported by the first stage carrier 311C. The front end of the second pin 312A is supported by the second stage carrier 312C. The second pins 312A are provided at intervals in the circumferential direction. In the embodiment, four second pins 312A are provided at equal intervals in the circumferential direction. The positions of the first pins 311A ​​and the second pins 312A are different in the circumferential direction. The second pin 312A is disposed between a pair of first pins 311A ​​adjacent to each other in the circumferential direction. The planetary gears 312P are supported by the multiple (four) second pins 312A, one for each. In the front-rear direction (axial direction), the planetary gears 312P are disposed between the first stage carrier 311C and the second stage carrier 312C. Each of the first stage carrier 311C and the second stage carrier 312C rotatably supports the planetary gear 312P via the second pins 312A. A gear is provided on the outer periphery of the second stage carrier 312C.

[0091] The internal gear 311R is disposed around the plurality of planetary gears 311P. The internal gear 312R is disposed 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.

[0092] The sun gear 32S of the second planetary gear mechanism 32 is disposed in front of the second stage carrier 312C. The diameter of the sun gear 32S is smaller than the diameter of the second stage carrier 312C. The second stage carrier 312C and the sun gear 32S are integral. The second stage carrier 312C 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.

[0093] The sun gear 33S of the third planetary gear mechanism 33 is disposed 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.

[0094] As shown in FIG. 6, the speed reduction mechanism 30 has a first speed change mechanism 71 and a second speed change mechanism 72.

[0095] 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 permitted, 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 permitted.

[0096] The first speed change mechanism 71 has a change ring 500 , a first change wire 510 , a first movable member 610 , and a first spring 630 .

[0097] The change ring 500 has a ring portion 500B and a plurality of protruding portions 500C fixed to the ring portion 500B. The protruding portions 500C are arranged in a guide groove 4K (see FIG. 5) provided on the inner peripheral surface of the first casing 4A. The guide groove 4K extends in the front-rear direction. By arranging the protruding portions 500C in the guide groove 4K of the first casing 4A, the relative rotation of the change ring 500 with respect to the first casing 4A is suppressed. The change ring 500 is movable in the front-rear direction inside the first casing 4A. The change ring 500 can move in the front-rear direction while the protruding portions 500C are guided by the guide groove 4K. The change ring 500 is arranged around at least one of the internal gear 311R and the internal gear 312R.

[0098] The change ring 500 is connected to a first switching wire 510. The change ring 500 is movable in the front-rear direction inside the first casing 4A. When the change ring 500 moves forward, the first deceleration mode is entered, and when the change ring 500 moves backward, the second deceleration mode is entered.

[0099] In the first planetary gear mechanism 31, the reduction ratio of a front stage consisting of the planetary gear 312P and the internal gear 312R is greater than the reduction ratio of a 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 second stage carrier 312C in the first deceleration mode is slower than the rotation speed of the second stage carrier 312C in the second deceleration mode.

[0100] In the embodiment, the reduction ratio of the second planetary gear mechanism 32 and the reduction ratio of the third planetary gear mechanism 33 are smaller than the reduction ratio of the rear stage (first stage) of the first planetary gear mechanism 31. The reduction ratio of the second planetary gear mechanism 32 is smaller than the reduction ratio of the third planetary gear mechanism 33.

[0101] As shown in FIG. 5 and FIG. 6, the first switching wire 510 is disposed outside the first casing 4A. The first switching wire 510 is movable in the front-rear direction outside the first casing 4A. The tip of the first switching wire 510 is inserted into a groove 500A provided in the change ring 500. A through hole 4H is provided in the first casing 4A. The tip of the first switching wire 510 is disposed inside the first casing 4A through the through hole 4H. The tip of the first switching wire 510 is inserted into the groove 500A inside the first casing 4A. The upper part of the first switching wire 510 is fixed to the first movable member 610. The first movable member 610 is connected to the speed change lever 12. The first movable member 610 is guided in the front-rear direction by the guide rod 600. The guide rod 600 is disposed so as to extend in the front-rear direction. The guide rod 600 is fixed to the casing 4. The rear end of the guide rod 600 is fixed to the motor bracket 4C. The front end of the guide rod 600 is fixed to the second casing 4B. A first guide hole extending in the front-rear direction is formed in the first movable member 610. The guide rod 600 passes through the first guide hole of the first movable member 610. The first spring 630 is a compression spring. The rear end of the first spring 630 is supported by the motor bracket 4C. The front end of the first spring 630 is connected to the first movable member 610. The first spring 630 generates an elastic force so that the first movable member 610 moves forward (in one direction). The first spring 630 urges the change ring 500 forward via the first movable member 610 and the first switching wire 510.

[0102] As shown in FIG. 8, 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. A cam groove 500D and a cam groove 500E are provided on the inner peripheral surface of the change ring 500. The cam groove 500D is formed at the rear end of the change ring 500 and engages with the cam teeth 311F of the internal gear 311R. The cam groove 500E is formed at the front end of the change ring 500 and engages with the cam teeth 312F of the internal gear 312R. The change ring 500 moves to a position where the cam groove 500D engages with the cam teeth 311F and a position where the cam groove 500E engages with the cam teeth 312F of the internal gear 312R while being guided by the guide groove 4K of the first casing 4A.

[0103] The change ring 500 is connected to the speed change lever 12 via a first switching wire 510 and a first movable member 610. The speed change lever 12 is operated so that the first movable member 610 moves in the front-rear direction. By operating the speed change lever 12 so that it moves in the front-rear direction, the first movable member 610 and the first switching wire 510 move in the front-rear direction, and the change ring 500 moves in the front-rear direction.

[0104] When the first movable member 610, the first switching wire 510, and the change ring 500 move forward and the change ring 500 is disposed around the internal gear 312R, the cam groove 500E engages with the cam teeth 312F. This prevents the internal gear 312R from rotating. In other words, when the first movable member 610, the first switching wire 510, and the change ring 500 move forward and the internal gear 312R is prevented from rotating, the first planetary gear mechanism 31 enters the first deceleration mode.

[0105] When the first movable member 610, the first switching wire 510, and the change ring 500 move backward and the change ring 500 is disposed around the internal gear 311R, the cam groove 500D engages with the cam teeth 311F. This prevents the internal gear 311R from rotating. In other words, when the first movable member 610, the first switching wire 510, and the change ring 500 move backward and the internal gear 311R is prevented from rotating, the first planetary gear mechanism 31 enters the second deceleration mode.

[0106] The second speed change mechanism 72 switches between an enabled mode in which the deceleration function of the second planetary gear mechanism 32 is enabled and an disabled mode in which the deceleration function of the second planetary gear mechanism 32 is disabled. Setting the second planetary gear mechanism 32 to the enabled mode includes preventing rotation of the internal gear 32R. Setting the second planetary gear mechanism 32 to 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 set to the enabled mode. By allowing rotation of the internal gear 32R, the second planetary gear mechanism 32 is set to the disabled mode.

[0107] As shown in FIGS. 5 and 6, the second speed change mechanism 72 has a second changeover wire 520 connected to the internal gear 32R, cam teeth 33F provided on the internal gear 33R, a second movable member 620, and a second spring 640.

[0108] The second switching wire 520 is disposed outside the first casing 4A. The second switching wire 520 is movable in the front-rear direction outside the first casing 4A. The tip of the second switching wire 520 is inserted into a groove 32E provided in the internal gear 32R. A through hole 4J is provided in the first casing 4A. The tip of the second switching wire 520 is disposed inside the first casing 4A through the through hole 4J. The tip of the second switching wire 520 is inserted into the groove 32E inside the first casing 4A. The upper part of the second switching wire 520 is fixed to the second movable member 620. The second movable member 620 is connected to the speed change lever 12. The second movable member 620 is disposed forward of the first movable member 610. The second movable member 620 is guided in the front-rear direction by a guide rod 600. A second guide hole extending in the front-rear direction is formed in the second movable member 620. The guide rod 600 passes through the second guide hole of the second movable member 620. The second spring 640 is a compression spring. The front end of the second spring 640 is supported by the second casing 4B. The rear end of the second spring 640 is connected to the second movable member 620. The second spring 640 generates an elastic force so that the second movable member 620 moves rearward. The second spring 640 urges the internal gear 32R rearward via the second movable member 620 and the second switching wire 520.

[0109] As shown in Fig. 7, a plurality of cam teeth 32F are provided on the outer circumferential surface of the internal gear 32R. The cam teeth 32F can mesh with the cam teeth 33F on the inner circumferential surface of the internal gear 33R. When the internal gear 32R is inserted inside the internal gear 33R, the rotation of the internal gear 32R is prevented by the cam teeth 33F of the internal gear 33R.

[0110] The internal gear 33R is disposed in front of the internal gear 32R. The internal gear 33R is fixed to the second casing 4B. Cam teeth 33G are provided on the outer circumferential surface of the internal gear 33R. The cam teeth 33G are inserted into recesses 4L provided on the inner circumferential surface of the second casing 4B. By inserting the cam teeth 33G into the recesses 4L, relative movement between the internal gear 33R and the second casing 4B is suppressed.

[0111] The speed switching lever 12 is operated so that the second movable member 620 moves in the front-rear direction. By operating the speed switching lever 12 to move in the front-rear direction, the second movable member 620 and the second switching wire 520 move in the front-rear direction, and the internal gear 32R moves in the front-rear direction. By the internal gear 32R moving in the front-rear direction, a state in which the internal gear 32R is inserted into the internal gear 33R and a state in which the internal gear 32R is removed from the internal gear 33R are switched.

[0112] The second movable member 620, the second switching wire 520, and the internal gear 32R move forward, at least a part of the internal gear 32R is inserted inside the internal gear 33R, and the cam teeth 33F of the internal gear 33R mesh with the cam teeth 32F of the internal gear 32R, thereby preventing the internal gear 32R from rotating. In other words, the second movable member 620, the second switching wire 520, and the internal gear 32R move forward, preventing the internal gear 32R from rotating, and the second planetary gear mechanism 32 enters the active mode.

[0113] The second movable member 620, the second switching wire 520, and the internal gear 32R move rearward, the internal gear 32R is removed from the inside of the internal gear 33R, and the cam teeth 33F of the internal gear 33R and the cam teeth 32F of the internal gear 32R separate from each other, thereby allowing the internal gear 32R to rotate. In other words, the second movable member 620, the second switching wire 520, and the internal gear 32R move rearward, allowing the internal gear 32R to rotate, and the second planetary gear mechanism 32 enters the disabled mode.

[0114] 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 gear on the outer periphery of the second stage carrier 312C.

[0115] As described above, in the embodiment, the speed modes of the reduction mechanism 30 include the low speed mode (first speed), the medium speed mode (second speed), and the high speed mode (third speed).

[0116] 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. The speed change lever 12 is operated to move to the front of its movable range, and the second movable member 620 moves forward, whereby 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. That is, in the low speed mode (first speed), the front stage (second stage) of the first planetary gear mechanism 31, the second planetary gear mechanism 32, and the third planetary gear mechanism 33 are used (enabled).

[0117] The medium speed mode includes a state in which the first planetary gear mechanism 31 is set to the first reduction mode and the second planetary gear mechanism 32 is set to the disabled mode. By operating the speed change lever 12 to move to the middle part of the movable range, the first planetary gear mechanism 31 is set to the first reduction mode and the second planetary gear mechanism 32 is set to the disabled mode. That is, in the medium speed mode (second speed), the front stage (second stage) of the first planetary gear mechanism 31 and the third planetary gear mechanism 33 are used (enabled).

[0118] 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 change lever 12 is operated to move to the rear of the movable range and the first movable member 610 moves rearward, 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. That is, in the high speed mode (third speed), the rear stage (first stage) of the first planetary gear mechanism 31 and the third planetary gear mechanism 33 are used (enabled).

[0119] The speed switching lever 12 is operated by an operator so that the first movable member 610 moves in the front-rear direction. The first movable member 610 moves in the front-rear direction while being guided by the guide rod 600. The speed switching lever 12 is operated by an operator so that the second movable member 620 moves in the front-rear direction. The second movable member 620 moves in the front-rear direction while being guided by the guide rod 600. The first spring 630 generates an elastic force so that the first movable member 610 moves forward. The second spring 640 generates an elastic force so that the second movable member 620 moves backward.

[0120] FIG. 9 is a cross-sectional view from above showing the moving structure of the speed change lever 12 according to the embodiment. When the speed reduction mechanism 30 is changed from the medium speed mode (second speed) to the low speed mode (first speed), the operator operates the speed change lever 12 so that the speed change lever 12 moves forward against the elastic force (biasing force) of the second spring 640. When the speed change lever 12 moves forward, the second movable member 620 moves forward against the elastic force of the second spring 640. As shown in FIG. 9, a pair of walls 12A and 12B are provided on the lower surface of the speed change lever 12. The pair of walls 12A and 12B are disposed on the left and right sides of the guide rod 600, the first movable member 610, and the second movable member 620. A leaf spring 530 is fixed to each of the pair of walls 12A and 12B. The speed change lever 12 is positioned at the first gear position by inserting the protrusion 530T of the leaf spring 530 into the recess 21A provided in a part of the motor housing portion 21. The recess 21A is provided at each of the first, second and third gear positions.

[0121] When changing the speed reduction mechanism 30 from the medium speed mode (second gear) to the high speed mode (third gear), the operator operates the speed change lever 12 so that the speed change lever 12 moves rearward against the elastic force (biasing force) of the first spring 630. The speed change lever 12 is positioned at the third gear position by inserting the convex portion 530T of the leaf spring 530 into the concave portion 21A formed at the third gear position.

[0122] Similarly, when changing the speed reduction mechanism 30 from the low-speed mode (first gear) to the medium-speed mode (second gear), the worker operates the speed change lever 12 so that the speed change lever 12 moves backward. When changing the speed reduction mechanism 30 from the high-speed mode (third gear) to the medium-speed mode (second gear), the worker operates the speed change lever 12 so that the speed change lever 12 moves forward. The speed change lever 12 is positioned at the second gear position by inserting the convex portion 530T of the leaf spring 530 into the concave portion 21A formed at the second gear position.

[0123] 10 is a cross-sectional view showing the vibration mechanism 40 according to the embodiment. The vibration mechanism 40 is disposed around the spindle 81. 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.

[0124] 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.

[0125] 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 a 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.

[0126] 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 side 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 a space defined by the support ring 45 and the washer 47 with its front-rear movement restricted.

[0127] 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 can rotate together. The vibration switching ring 43 can move 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 protrusion 43T restricts the rotation of the vibration switching ring 43. 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 of the vibration switching ring 43.

[0128] The vibration switching ring 43 can move in the front-rear direction while being guided by a guide hole provided in the second casing 4B. The vibration switching ring 43 is pushed by the cam ring 48 with the rotation of the mode switching ring 13, and moves rearward. The vibration switching ring 43 is biased forward by the spring 43A. When the mode switching ring 13 is returned and the pressure by the cam ring 48 is released, the vibration switching ring 43 is pushed by the spring 43A and returns to the forward position. 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 the vibration mode and the non-vibration mode by moving in the front-rear direction between the forward position and the retreated position behind the forward position. When the mode switching ring 13 is operated, the vibration mode and the non-vibration mode are switched.

[0129] The vibration mode includes a state in which the rotation of the second cam 42 is restricted. When the vibration switching ring 43 moves to the forward position, the rotation of the second cam 42 is restricted. The non-vibration mode includes a state in which the rotation of the second cam 42 is permitted. When the vibration switching ring 43 moves to the backward position, the rotation of the second cam 42 is permitted.

[0130] In the vibration mode, at least a part of the vibration switching ring 43, which is pushed by the spring 43A and 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 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 part 43S of the vibration switching ring 43. This 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 hitting the cam teeth of the second cam 42. This causes the spindle 81 to rotate while vibrating in the front-rear direction.

[0131] In the non-vibration mode, the vibration switching ring 43, which is pushed by the cam ring 48 and moves to the retracted position, moves away from the second cam 42. When the vibration switching ring 43 moves to the retracted position, the opposing part 43S of the vibration switching ring 43 moves away from the second cam 42. The movement of the vibration switching ring 43 and the second cam 42 away from each other 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. As a result, the spindle 81 rotates without vibrating in the front-rear direction.

[0132] [Elements and leads] Fig. 11 is a rear perspective view showing the left housing 2L and the motor bracket 4C according to the embodiment. As shown in Fig. 11, the driver drill 1 includes an element 50 and a lead wire 51 connected to the element 50. The element 50 includes a sensor that detects the switching of the reduction ratio by the speed change lever 12.

[0133] As shown in FIG. 9, the wall 12A of the speed change lever 12 is provided with a detection piece 12C. The element 50 is disposed directly below the wall 12A. In the embodiment, the detection piece 12C is a permanent magnet, and the element 50 is a magnetic sensor. As shown in FIG. 6, the element 50 is formed as a circuit board in which a magnetic sensor is built. A lead wire 51 is connected to this circuit board. The element 50 detects the magnetism generated by the detection piece 12C. The element 50 is connected to the controller 17 via the lead wire 51. The element 50 outputs a detection signal of the magnetism to the controller 17. The position of the detection piece 12C differs when the speed change lever 12 is in a low-speed mode (first speed), when the speed change lever 12 is in a medium-speed mode (second speed), and when the speed change lever 12 is in a high-speed mode (third speed). The detection signal output by the element 50 differs depending on the position of the detection piece 12C. The controller 17 detects in which mode the speed change lever 12 is in position based on the change in the detection signal.

[0134] The element 50 is provided above the motor 6 or the reduction mechanism 30. The element 50 is located between the speed switching lever 12 and the reduction mechanism 30 in the up-down direction. The element 50 is fixed to the left housing 2L. As shown in FIG. 11, the lead wire 51 is connected to the element 50 and extends below the motor 6 or the reduction mechanism 30. One end of the lead wire 51 is connected to the element 50, and the other end of the lead wire 51 is connected to the controller 17. The lead wire 51 passes downward from the upper part of the left housing 2L along the inner surface of the left housing 2L to the left of the motor accommodating section 21 (the space in which the motor 6, the motor bracket 4C, and the reduction mechanism 30 are arranged). The lead wire 51 extends to the controller 17 provided in the battery holding section 23 below the motor 6.

[0135] In the embodiment, a passage LP through which the lead wire 51 passes is provided between the motor 6 and the reduction mechanism 30 in the front-rear direction. Specifically, the motor bracket 4C is disposed between the motor 6 and the reduction mechanism 30. The passage LP is provided between the motor bracket 4C and the housing 2 (left housing 2L) surrounding the outer periphery of the motor bracket 4C. The passage LP is a linear region along the inner surface of the left housing 2L, which is constituted by the motor bracket 4C and the left housing 2L.

[0136] FIG. 12 is a rear perspective view showing the motor bracket 4C according to the embodiment. FIG. 13 is a perspective view showing a part of the left housing 2L according to the embodiment. As shown in FIG. 13, the inner surface of the housing 2 has a recessed portion 2A in which the lead wire 51 is arranged. The recessed portion 2A is provided in the left housing 2L. At least a part of the passage LP is formed by the recessed portion 2A. The recessed portion 2A is an area in which the inner surface of the left housing 2L is recessed. The recessed portion 2A extends in the up-down direction along the inner surface of the left housing 2L from the upper part to the lower part of the motor accommodating portion 21 of the left housing 2L. The front-rear width of the recessed portion 2A is set corresponding to the line width of the lead wire 51, and a part of the lead wire 51 is arranged in the recessed portion 2A. A plurality of guide projections 2B are formed on the rear edge of the recessed portion 2A. A support wall 2C that supports the left side surface of the motor bracket 4C is formed on the front edge of the recessed portion 2A. The plurality of guide projections 2B rise from the inner surface of the left housing 2L. The guide protrusions 2B are arranged at intervals in the vertical direction along the recessed portion 2A. Four guide protrusions 2B are provided. The support wall 2C rises from the inner surface of the left housing 2L. The tip of the support wall 2C corresponds to the shape of the left side surface of the motor bracket 4C in a concave-convex relationship, and the left side surface of the motor bracket 4C fits into the tip of the support wall 2C.

[0137] As shown in FIG. 12, the motor bracket 4C is a plate member having an annular shape. The bearing 64 is attached to a central opening 91 of the motor bracket 4C. The motor bracket 4C has an attachment portion 92 with a screw insertion hole formed at each of the four corners of the outer circumference. The motor bracket 4C is fixed to a fixing portion 4M (see FIG. 5) at the rear end of the first casing 4A by a screw 4E (see FIG. 4) passing through the screw insertion hole of the attachment portion 92. The motor bracket 4C functions as a pressing plate on the rear side of the reduction mechanism 30 in the first casing 4A. The motor bracket 4C functions as a positioning member that positions the motor 6 and the reduction mechanism 30. That is, the motor bracket 4C aligns the position of the rotor shaft 63 passing through the inside of the bearing 64 with the position of the central axis of the reduction mechanism 30. The motor bracket 4C has a rod support portion 93 at the upper end portion thereof. The rod support portion 93 has a recess into which the rear end portion of the guide rod 600 is inserted.

[0138] In the embodiment, the motor bracket 4C functions as a pressing member that presses the lead wire 51. The motor bracket 4C contacts the lead wire 51 at a portion of its outer circumferential surface. The motor bracket 4C has protruding portions (94, 95) on the outer periphery of the motor bracket 4C that protrude toward the recessed portion 2A. The protruding portions (94, 95) are provided on the outer periphery of the left side of the motor bracket 4C and face the left housing 2L. The protruding portions include a first protruding portion 94 and a second protruding portion 95 along the circumferential direction of the motor bracket 4C. In the embodiment, one first protruding portion 94 and two second protruding portions 95 are formed.

[0139] The first protrusion 94 is disposed on a side surface of the motor bracket 4C. The first protrusion 94 is disposed on the left side surface of the motor bracket 4C at approximately the center of the motor bracket 4C in the up-down direction. The first protrusion 94 is disposed to the left of the rotation shaft (rotor shaft 63) of the motor 6 located at the center of the motor bracket 4C. The second protrusion 95 is disposed above or below the first protrusion 94 on the motor bracket 4C. The second protrusion 95 is provided on the outer periphery of the motor bracket 4C at a position above the first protrusion 94 and a position below the first protrusion 94. Both the first protrusion 94 and the second protrusion 95 are provided on the outer periphery of the rear surface of the motor bracket 4C and protrude to the rear side of the motor bracket 4C. As shown in FIG. 11, when the motor bracket 4C is attached to the support wall 2C of the left housing 2L, the front-rear positions of the first protrusion 94 and the second protrusion 95 coincide with the formation position of the recessed portion 2A. The first protrusion 94 and the second protrusion 95 both protrude radially outward from the outer periphery of the rear surface of the motor bracket 4C. Therefore, the first protrusion 94 and the second protrusion 95 protrude toward the recessed portion 2A. The first protrusion 94 and the second protrusion 95 face the recessed portion 2A in the radial direction of the motor bracket 4C.

[0140] FIG. 14 is a cross-sectional view of the passage LP of the lead wire 51 according to the embodiment, taken from the rear to the front. As shown in FIG. 14, in the radial direction from the rotating shaft (rotor shaft 63) of the motor 6, the distance L1 from the rotating shaft to the tip of the first protrusion 94 is smaller than the distances L2 and L3 from the rotating shaft to the tip of the second protrusion 95. As shown in FIG. 12, the first protrusion 94 and the second protrusion 95 protrude radially outward from the outer periphery of the motor bracket 4C, but the protrusion amount of the first protrusion 94 is smaller than the protrusion amount of the second protrusion 95. Therefore, the distance L1 is smaller than the distances L2 and L3. At the formation position of the first protrusion 94, the position of the inner surface of the left housing 2L (the inner bottom surface of the recessed portion 2A) can be brought closer to the first protrusion 94 by the amount that the distance L1 is smaller. As a result, the position of the outer surface of the left housing 2L can be brought closer to the radial center, so that the width dimension of the housing 2 in the motor accommodating portion 21 is suppressed.

[0141] The lead wire 51 is arranged so as to fit into the recessed portion 2A, and is pressed from the right side by the respective convex portions (first convex portion 94 and second convex portion 95) of the motor bracket 4C. Therefore, the lead wire 51 is sandwiched between the housing 2 and the motor bracket 4C. In other words, the lead wire 51 is held from the outside by the housing 2. The lead wire 51 is held from the inside by the motor bracket 4C. The inner surface (recessed portion 2A) of the left housing 2L contacts the lead wire 51 from the left side, and the respective convex portions (first convex portion 94 and second convex portion 95) contact the lead wire 51 from the right side. Therefore, the radial positional deviation (floating) of the lead wire 51 from the inner surface of the left housing 2L is suppressed. Moreover, the lead wire 51 is sandwiched between the multiple guide protrusions 2B of the left housing 2L and the support wall 2C in the front-rear direction. The guide protrusions 2B contact the lead wires 51 from the rear side, and the support wall 2C contacts the lead wires 51 from the front side. Therefore, displacement of the lead wires 51 in the front-rear direction on the inner surface of the left housing 2L is suppressed.

[0142] [handle] Fig. 15 is a front perspective view showing the driver drill 1 with the handle 100 according to the embodiment attached. Fig. 16 is a perspective explanatory view showing the attachment portion 110 of the handle 100 according to the embodiment. Fig. 17 is a cross-sectional view taken from the rear to the front as viewed from the arrow, illustrating the engagement between the handle 100 and the attachment portion 110 according to the embodiment.

[0143] As shown in Figures 15, 16 and 17, the driver drill 1 has a detachable handle 100. An operator can stably and firmly hold the driver drill 1 during work by holding the grip portion 22 with one hand and the handle 100 with the other hand. The handle 100 can be attached to the housing 2 or the casing 4. In the embodiment, the handle 100 can be detachably attached to the second casing 4B of the casing 4. The second casing 4B has an attachment portion 110 for attaching the handle 100.

[0144] The handle 100 has a handle grip 101, an arm 102, and a band 103. The arm 102 is attached to the tip of the handle grip 101. The arm 102 is made of metal and is a hollow cylindrical member. The mounting part 110 has a circular cross section when viewed from the front-rear direction. The tip part 102A of the arm 102 is formed in a concave and arc shape along the outer periphery of the mounting part 110 (second casing 4B). The tip part 102A of the arm 102 is open. The band 103 is a wide belt-shaped member. Both ends of the band 103 are inserted into the opening of the tip part 102A of the arm 102 and connected to the handle grip 101 inside the arm 102. As a result, the band 103 is provided in a loop shape. The handle grip 101 is rotatable around the long axis (center axis) relative to the arm 102. When the handle grip 101 is twisted to rotate in one direction, the handle grip 101 pulls the band 103 into the arm 102 due to the rotation, and the loop diameter of the band 103 is reduced. When the handle grip 101 is twisted to rotate in the other direction, the handle grip 101 unwinds the band 103 from the arm 102 due to the rotation, and the loop diameter of the band 103 is enlarged. With the loop diameter enlarged, the attachment part 110 of the second casing 4B can be disposed inside the loop of the band 103. With the attachment part 110 disposed inside the loop of the band 103, the loop diameter is reduced, and the band 103 pulls the attachment part 110 toward the tip part 102A of the arm 102 and tightens it. Tightening the band 103 fixes the arm 102 to the attachment part 110.

[0145] The mounting portion 110 of the second casing 4B and the tip portion 102A of the arm 102 can be engaged with each other. The engagement prevents the arm 102 from being displaced in the circumferential direction of the mounting portion 110. The mounting portion 110 is formed with a plurality of engagement recesses 111. The engagement recesses 111 are formed at equal angular intervals over the entire circumference of the mounting portion 110 in the circumferential direction. The engagement recesses 111 are provided in two rows at the front end of the mounting portion 110 and at the rear end of the mounting portion 110. In addition, flanges 112 rising outward in the radial direction are formed on both outer sides of the two rows of engagement recesses 111. In other words, the mounting portion 110 is formed between a pair of flanges 112 with an outer diameter smaller than that of the flanges 112. The tip portion 102A of the arm 102 is attached between the pair of flanges 112. The engagement recesses 111 and the pair of flanges 112 prevent the arm 102 from being displaced in the front-rear direction.

[0146] The tip 102A of the arm 102 is provided with engaging protrusions 104 that engage with the engaging recesses 111. The engaging protrusions 104 are formed in two rows, front and rear, corresponding to the two rows of engaging recesses 111 in the front and rear directions. The two rows of engaging protrusions 104 are formed at the tip of the front wall 102B that defines the opening of the arm 102 and at the tip of the rear wall 102B. A plurality of engaging protrusions 104 are formed in each row along the circumferential direction of the tip 102A. A plurality of engaging protrusions 104 are formed from one end to the other end of the tip 102A of the arm 102. Each of the plurality of engaging protrusions 104 engages with a plurality of engaging recesses 111 in one row aligned in the circumferential direction of the mounting part 110. The two rows of engaging protrusions 104 fit into the two rows of engaging recesses 111, thereby engaging the arm 102 and the mounting part 110.

[0147] As shown in FIG. 17, the engagement recesses 111 are arranged around the entire circumference of the mounting part 110 at equal angular intervals of a predetermined angle θ. In the embodiment, the angle θ is 15 degrees. 24 engagement recesses 111 are formed around the entire circumference of the mounting part 110 at 15 degree intervals. The engagement protrusions 104 of the tip 102A of the arm 102 are formed at equal angular intervals of the angle θ, like the engagement recesses 111. In the embodiment, the rows of the engagement protrusions 104 are composed of eight engagement protrusions 104 per row. The arm 102 engages with the mounting part 110 through a total of 16 engagement protrusions 104 and engagement recesses 111, i.e., two rows of eight protrusions. The handle 100 can be attached to the mounting part 110 in any orientation in units of the angle θ.

[0148] When attaching the handle 100, the worker places the attachment part 110 of the second casing 4B inside the loop of the band 103 with the loop diameter of the band 103 enlarged. The worker abuts the tip 102A of the arm 102 against the attachment part 110 and fits each engagement protrusion 104 into the engagement recess 111. The worker twists the handle grip 101 in one direction to reduce the loop diameter of the band 103. The tightening force of the band 103 keeps the tip 102A of the arm 102 pressed against the attachment part 110. This allows the handle 100 to be attached to the attachment part 110. When removing the handle 100 or changing the attachment position, the worker twists the handle grip 101 in the other direction to enlarge the loop diameter of the band 103 and release the tip 102A of the arm 102 from being pressed against the attachment part 110.

[0149] [effect] As described above, in the embodiment, the driver drill 1 may include the motor 6, the output unit 8 provided in front of the motor 6 and driven by the motor 6, the speed reduction mechanism 30 arranged between the motor 6 and the output unit 8, the motor bracket 4C arranged between the motor 6 and the speed reduction mechanism 30, the housing 2 accommodating the motor 6 and the motor bracket 4C, the element 50 provided above the motor 6 or the speed reduction mechanism 30, and the lead wire 51 connected to the element 50 and extending below the motor 6 or the speed reduction mechanism 30. The lead wire 51 may be sandwiched between the housing 2 and the motor bracket 4C.

[0150] In the above-described configuration, the lead wire 51 connected to the element 50 is appropriately held while suppressing an increase in the outer dimensions.

[0151] In the embodiment, the driver drill 1 may have a recessed portion 2A on the inner surface of the housing 2 in which the lead wire 51 is disposed.

[0152] In the above configuration, the positional deviation of the lead wires 51 is effectively suppressed.

[0153] In the embodiment, the driver drill 1 may have protrusions (94, 95) on the outer periphery of the motor bracket 4C that protrude toward the recessed portion 2A.

[0154] In the above-described configuration, the positional deviation of the lead wire 51 between the recess 2A and the protrusions (94, 95) is more effectively prevented.

[0155] In the embodiment, the convex portion may include a first convex portion 94 and a second convex portion 95 along the circumferential direction of the motor bracket 4C. In the radial direction from the rotation shaft (rotor shaft 63) of the motor 6, the distance from the rotation shaft to the tip of the first convex portion 94 may be smaller than the distance from the rotation shaft to the tip of the second convex portion 95.

[0156] In the above-described configuration, even if a convex portion is provided, the outer shape of the housing 2 is unlikely to become large at the position where the first convex portion 94 is formed, so that an increase in size of the driver drill 1 is suppressed.

[0157] In the embodiment, the first protrusion 94 may be disposed on a side surface of the motor bracket 4 C. The second protrusion 95 may be disposed above or below the first protrusion 94 on the motor bracket 4 C.

[0158] With the above configuration, the width dimension of the driver drill 1 is reduced.

[0159] In the embodiment, the driver drill 1 may further include a vibration mechanism 40 that vibrates the output portion 8.

[0160] The above-mentioned configuration enables drilling using vibration. Even when vibration is used, displacement of the lead wire 51 caused by the vibration is effectively suppressed.

[0161] In an embodiment, the reduction gear mechanism 30 may have multiple speed settings. The driver drill 1 may further include a speed change lever 12 disposed on an upper portion of the housing 2 and configured to change the reduction ratio of the reduction gear mechanism 30. The element 50 may include a sensor that detects the change of the reduction gear ratio caused by the speed change lever 12.

[0162] In the above arrangement, the leads 51 connecting to the sensors in the upper part of the housing 2 are held in place.

[0163] In an embodiment, the driver drill 1, which is a percussion driver drill, may include a motor 6, an output unit 8 provided in front of the motor 6 and driven by the motor 6, a speed reduction mechanism 30 arranged between the motor 6 and the output unit 8, a vibration mechanism 40 arranged between the speed reduction mechanism 30 and the output unit 8, a motor bracket 4C arranged between the motor 6 and the speed reduction mechanism 30, a housing 2 that accommodates the motor 6 and the motor bracket 4C, an element 50 provided above the motor 6 or the speed reduction mechanism 30, and a lead wire 51 connected to the element 50 and extending below the motor 6. The lead wire 51 may be held by the motor bracket 4C.

[0164] In the above configuration, the lead wires 51 connected to the element 50 are appropriately held while suppressing an increase in the external dimensions. Even when the element 50 is subjected to vibration, displacement of the lead wires 51 caused by the vibration is effectively suppressed.

[0165] In an embodiment, the driver drill 1, which is a percussion driver drill, may include a motor 6, an output unit 8 provided in front of the motor 6 and driven by the motor 6, a speed reduction mechanism 30 arranged between the motor 6 and the output unit 8, a vibration mechanism 40 arranged between the output unit 8 and the speed reduction mechanism 30, a housing 2 accommodating the motor 6 and the speed reduction mechanism 30, an element 50 provided above the motor 6 and the speed reduction mechanism 30, and a controller 17 provided below the motor 6 and connected to the element 50 via a lead wire 51. A passage LP for passing the lead wire 51 may be provided between the motor 6 and the speed reduction mechanism 30 in the front-rear direction.

[0166] In the above configuration, the lead wires 51 connected to the element 50 are appropriately held while suppressing an increase in the external dimensions. Even when the element 50 is subjected to vibration, displacement of the lead wires 51 caused by the vibration is effectively suppressed.

[0167] In the embodiment, the driver drill 1, which is a percussion driver drill, may further include a motor bracket 4C that is disposed between the motor 6 and the reduction gear mechanism 30 and positions the motor 6 and the reduction gear mechanism 30. The passage LP may be provided between the motor bracket 4C and the housing 2 that surrounds the outer periphery of the motor bracket 4C.

[0168] In the above configuration, the passage LP of the lead wire 51 is constructed without increasing the number of parts.

[0169] [Other embodiments] In the above 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.

[0170] In the above-described embodiment, the element 50 to which the lead wire 51 is connected includes a sensor that detects the switching of the reduction ratio by the speed change lever 12. The element 50 to which the lead wire 51 is connected may be something other than a sensor that detects the switching of the reduction ratio by the speed change lever 12.

[0171] Figures 18 and 19 are schematic diagrams showing an element 50 according to another embodiment. In Figures 18 and 19, the outer shape of the driver drill 1 (housing 2) is shown by dotted lines, and the motor 6, motor bracket 4C, speed reduction mechanism 30, speed switching lever 12 and element 50 are shown by solid lines. Lead wires 51 are shown by two-dot chain lines.

[0172] In FIG. 18, the element 50 includes a notification lamp that notifies the driving state of the motor 6. The element 50 includes a light-emitting unit 151 and a circuit board 152. The light-emitting unit 151 is, for example, an LED (light-emitting diode) element. The light-emitting unit 151 emits light when power is supplied via a lead wire 51. The light-emitting unit 151 is exposed from the upper part of the housing 2, or is visible through a light-transmitting window member provided in the upper part of the housing 2. The element 50 may include a plurality of light-emitting units 151. For example, the controller 17 turns on the notification lamp while the motor 6 is rotating. The controller 17 makes the lighting state of the notification lamp different between one rotation and the other rotation of the motor 6. Making the lighting state different means, for example, making the light-emitting color, the lighting (blinking) interval, the light-emitting unit 151 that emits light, and the like. For example, the controller 17 turns on the notification lamp when the current value of the motor 6 exceeds a threshold value.

[0173] The element 50 is provided above the motor 6. In this case as well, the lead wire 51 passes through a passage LP (see FIG. 11) between the motor 6 and the reduction gear mechanism 30 in the front-rear direction and is connected to the element 50. The lead wire 51 is sandwiched between the housing 2 and the motor bracket 4C and held by the motor bracket 4C.

[0174] As described above, in the embodiment, the element 50 includes an indicator lamp that indicates the driving state of the motor 6. In the above configuration, the lead wire 51 connected to the indicator lamp is appropriately held.

[0175] In FIG. 19, the element 50 includes an operation switch that accepts an operation input. The element 50 includes an input unit 153 and a circuit board 154. The input unit 153 is composed of an input device that accepts an operation input. The input device may be a button switch, another mechanical switch, a touch sensor, a non-contact proximity sensor, or the like. The input unit 153 outputs a signal according to the operation input to the controller 17 via a lead wire 51. The input unit 153 is exposed from the upper part of the housing 2, or can be operated via a window member provided in the upper part of the housing 2. The element 50 may include a plurality of input units 153. The controller 17 accepts an operation to change the mode of the driver drill 1, for example, via an operation switch. The controller 17 switches, for example, the operation mode of the motor 6 in response to the operation input. The controller 17 changes the maximum torque value of the motor 6 in response to the switching to the operation mode. The controller 17 changes the maximum rotation speed of the motor 6 in response to the switching to the operation mode. An operating device 24, such as the interface panel 15 of the embodiment, and a display device 25 may be provided as element 50 in FIG.

[0176] The element 50 is provided above the motor 6. In this case as well, the lead wire 51 passes through a passage LP (see FIG. 11) between the motor 6 and the reduction gear mechanism 30 in the front-rear direction and is connected to the element 50. The lead wire 51 is sandwiched between the housing 2 and the motor bracket 4C and held by the motor bracket 4C.

[0177] In an embodiment, the element 50 may include an operation switch that accepts an operation input. In the above configuration, the lead wire 51 that connects to the operation switch is appropriately held.

[0178] In the embodiment described above, the lead wire 51 is sandwiched between the motor bracket 4C and the housing 2 (left housing 2L). The lead wire 51 does not have to be sandwiched between the motor bracket 4C and the housing 2 (left housing 2L).

[0179] FIG. 20 is a perspective view showing a motor bracket according to another embodiment. In FIG. 20, the lead wire 51 is indicated by a two-dot chain line. In FIG. 20, a passage LP is provided in the motor bracket 4C. The motor bracket 4C has a cylindrical portion 191 at the outer periphery in the left direction, through which the lead wire 51 passes. The cylindrical portion 191 has an internal space that is open at both ends and penetrates along the circumferential direction of the motor bracket 4C. The cylindrical portion 191 is disposed at three locations corresponding to the first protrusion 94 and the two second protrusions 95 shown in FIG. 12. Each of these three cylindrical portions 191 constitutes a passage LP through which the lead wire 51 passes. In FIG. 20, the lead wire 51 is held by the motor bracket 4C.

[0180] FIG. 21 is a left side view showing a motor bracket according to another embodiment. In FIG. 21, the lead wire 51 is indicated by a two-dot chain line. In FIG. 21, a passage LP is provided in the motor bracket 4C. The motor bracket 4C has a passage LP formed of a pair of wall portions 192A, 192B on the outer periphery in the left direction. The pair of wall portions 192A, 192B protrude radially outward from the outer periphery of the motor bracket 4C. The pair of wall portions 192A, 192B face each other with a gap in between in the front-rear direction. The passage LP is formed by a gap between the pair of wall portions 192A, 192B. The size of the gap between the pair of wall portions 192A, 192B (i.e., the width of the passage LP) is set to a width suitable for holding the lead wire 51. A convex wall protruding toward the wall portion 192B is formed in the wall portion 192A at the middle position of the passage LP. The wall 192B has a concave portion recessed in a direction away from the wall 192A (rearward) at least at the position where the convex wall is formed. The convex wall of the wall 192A and the concave portion of the wall 192B form a curved shape of the passage LP. The lead wire 51 is inserted into the curved passage LP. The lead wire 51 is curved in the passage LP, so that the frictional resistance between the lead wire 51 and the walls 192A and 192B increases. This fixes the lead wire 51 in the passage LP. Since the pair of walls 192A and 192B protrude radially outward, the passage LP is open radially outward. The open portion of the passage LP is covered by the inner surface of the housing 2 (left housing 2L), and the lead wire 51 is prevented from slipping out of the passage LP. The pair of walls 192A, 192B are disposed at three locations corresponding to the first protrusion 94 and the two second protrusions 95 shown in Fig. 12. In Fig. 20, the lead wire 51 is held by the motor bracket 4C.

[0181] 20 and 21, the lead wire 51 is passed between the left side surface of the motor bracket 4C and the left housing 2L. The lead wire 51 may be passed between the right side surface of the motor bracket 4C and the right housing 2R.

[0182] In the above embodiment, the passage LP between the motor 6 and the reduction gear mechanism 30 is provided between the motor bracket 4C and the housing 2. The passage LP between the motor 6 and the reduction gear mechanism 30 may be provided in a member other than the motor bracket 4C. For example, a member for forming the passage LP through which the lead wire 51 passes may be added between the motor 6 and the motor bracket 4C. [Explanation of symbols]

[0183] 1...driver drill, 2...housing, 2A...concave portion, 2B...guide projection, 2C...support wall, 2L...left housing, 2R...right housing, 3...rear cover, 4...casing, 4A...first casing, 4B...second casing, 4C...motor bracket, 4D...stop plate, 4E, 4F, 4S...screw, 4H...through hole, 4J...through hole, 4K...guide groove, 4L...concave, 4M...fixing portion, 5...battery mounting portion, 6...motor, 7...power transmission mechanism, 8...output portion, 9...fan, 10...trigger lever, 11...forward / reverse switching lever, 12...speed switching lever, 12A, 12B...wall portion, 1 2C...detection piece, 13...mode switching ring, 15...interface panel, 16...dial, 17...controller, 18...intake port, 19...exhaust port, 20...battery pack, 21...motor housing, 21A...recess, 22...grip portion, 23...battery holding portion, 24...operation device, 25...display device, 26...controller case, 27...panel opening, 28...dial opening, 30...reduction mechanism, 31...first planetary gear mechanism, 31S...pinion gear, 32...second planetary gear mechanism, 32A...pin, 32C...second carrier, 32E...groove, 32F...cam tooth, 32P...planetary gear, 3 2R...internal gear, 32S...sun gear, 33...third planetary gear mechanism, 33A...pin, 33C...third carrier, 33F...cam teeth, 33G...cam teeth, 33P...planetary gear, 33R...internal gear, 33S...sun gear, 40...vibration mechanism, 41...first cam, 42...second cam, 43...vibration switching ring, 43A...spring, 43S...opposing portion, 43T...projection portion, 44...stop ring, 45...support ring, 46...steel ball, 47...washer, 48...cam ring, 50...element, 51...lead wire, 61...stator, 61A...stator core, 61B...front insulator 61C...rear insulator, 61D...coil, 62...rotor, 62A...rotor core, 62B...permanent magnet, 63...rotor shaft, 64, 65...bearing, 71...first speed change mechanism, 72...second speed change mechanism, 81...spindle, 81F...flange portion, 81R...screw hole, 81T...flat surface, 82...chuck, 83, 84...bearing, 91...central opening, 92...mounting portion, 93...rod support portion, 94...first convex portion, 95...second convex portion, 100...handle, 101...handle grip, 102...arm, 102A...tip portion, 103...band, 104...engagement convex portion,110... mounting portion, 111... engagement recess, 112... flange, 151... light emitting portion, 152... circuit board, 153... input portion, 154... circuit board, 191... cylindrical portion, 192A, 192B... wall portion, 311A... first pin, 311C... first stage carrier, 311F... cam teeth, 311P... planetary gear, 311R... internal gear, 311S... large diameter portion, 312A... second pin, 312C... second stage carrier, 312F... cam teeth, 312P... planetary gear, 312R... internal gear axial gear, 312S...small diameter portion, 500...change ring, 500A...groove, 500B...ring portion, 500C...projection portion, 500D...cam groove, 500E...cam groove, 510...first switching wire, 520...second switching wire, 530...leaf spring, 530T...projection portion, 600...guide rod, 610...first movable member, 620...second movable member, 630...first spring, 640...second spring, AX...rotation axis, L1, L2, L3...distance, LP...passage, θ...angle.

Claims

1. Motor and, An output unit is provided in front of the motor and is driven by the motor, A reduction mechanism is disposed between the motor and the output unit, A motor bracket is disposed between the motor and the reduction mechanism, A housing that accommodates the motor and the motor bracket, An element provided above the motor or the reduction mechanism, The element is connected to a lead wire that extends downward below the motor or the reduction mechanism, The lead wire is sandwiched between the housing and the motor bracket. Driver drill.

2. The inner surface of the housing has a recessed portion where the lead wire is arranged. The driver drill according to claim 1.

3. The outer circumference of the motor bracket has a protrusion that extends toward the concave portion, The driver drill according to claim 2.

4. The aforementioned protrusion includes a first protrusion and a second protrusion along the circumferential direction of the motor bracket. In the radial direction from the rotation axis of the motor, the distance from the rotation axis to the tip of the first protrusion is smaller than the distance from the rotation axis to the tip of the second protrusion. The driver drill according to claim 3.

5. The first protrusion is positioned on the side surface of the motor bracket, The second protrusion is positioned above or below the motor bracket compared to the first protrusion. The driver drill according to claim 4.

6. The output section is further provided with a vibration mechanism for causing it to vibrate. The driver drill according to claim 1.

7. The aforementioned reduction mechanism is a multi-speed transmission, The housing is located on top of the aforementioned housing and further includes a speed switching lever for switching the reduction ratio of the reduction mechanism, The element includes a sensor that detects the switching of the reduction ratio by the speed switching lever. The driver drill according to claim 1.

8. The element includes an indicator lamp that indicates the operating status of the motor. The driver drill according to claim 1.

9. The element includes an operating switch that accepts an operating input. The driver drill according to claim 1.

10. Motor and, An output unit is provided in front of the motor and is driven by the motor, A reduction mechanism is disposed between the motor and the output unit, A vibration mechanism is disposed between the reduction mechanism and the output unit, A motor bracket is disposed between the motor and the reduction mechanism, A housing that accommodates the motor and the motor bracket, An element provided above the motor or the reduction mechanism, The element is connected to a lead wire that extends downward from the motor, The lead wire is held in the motor bracket. Impact driver drill.

11. Motor and, An output unit is provided in front of the motor and is driven by the motor, A reduction mechanism is disposed between the motor and the output unit, A vibration mechanism is disposed between the output unit and the reduction mechanism, A housing that accommodates the motor and the reduction mechanism, An element provided above the motor and the reduction mechanism, The system includes a controller located below the motor and connected to the element via lead wires, A passage is provided between the motor and the reduction mechanism in the front-rear direction for the lead wire to pass through. Impact driver drill.

12. The motor further comprises a motor bracket positioned between the motor and the reduction mechanism, which positions the motor and the reduction mechanism. The passage is provided between the motor bracket and the housing that surrounds the outer circumference of the motor bracket. The vibration driver drill according to claim 11.

Images