Screwdriver drill and vibrating screwdriver drill

Abstract

The present invention addresses the problem of appropriately holding a lead wire connected to an element while suppressing an increase in size of a screwdriver drill. A screwdriver drill is provided with: a motor; an output unit provided in front of the motor and driven by the motor; a speed reduction mechanism disposed between the motor and the output unit; a motor bracket disposed between the motor and the speed reduction mechanism; a housing that accommodates the motor and the motor bracket; the element is arranged above the motor or the speed reducing mechanism; and a lead wire connected to the element and extending to a position lower than the motor or the speed reduction mechanism. The wire is clamped between the shell and the motor bracket.

Description

Technical Field

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

[0002] In the technical field related to a driver drill, a driver drill disclosed in Patent Document 1 is known.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-171857 Summary of the invention

[0004] An object of the technology disclosed in this specification is to appropriately hold a lead wire connected to a component while suppressing an increase in the outer dimensions.

[0005] The present specification discloses a driver drill. The driver drill may include: a motor; an output portion, which is arranged in front of the motor and driven by the motor; a reduction mechanism, which is arranged between the motor and the output portion; a motor bracket, which is arranged between the motor and the reduction mechanism; a housing, which accommodates the motor and the motor bracket; an element, which is arranged above the motor or the reduction mechanism; and a wire, which is connected to the element and extends to a position below the motor or the reduction mechanism. The wire may be sandwiched between the housing and the motor bracket.

[0006] In addition, the present specification discloses a vibration driver drill. The vibration driver drill may include: a motor; an output portion, which is arranged in front of the motor and driven by the motor; a reduction mechanism, which is arranged between the motor and the output portion; a vibration mechanism, which is arranged between the reduction mechanism and the output portion; a motor bracket, which is arranged between the motor and the reduction mechanism; a housing, which accommodates the motor and the motor bracket; an element, which is arranged above the motor or the reduction mechanism; and a wire, which is connected to the element and extends to a position below the motor. The wire can be held by the motor bracket.

[0007] In addition, the vibration driver drill may include: a motor; an output portion, which is arranged in front of the motor and driven by the motor; a speed reduction mechanism, which is arranged between the motor and the output portion; a vibration mechanism, which is arranged between the output portion and the speed reduction mechanism; a housing, which accommodates the motor and the speed reduction mechanism; an element, which is arranged above the motor and the speed reduction mechanism; and a controller, which is arranged below the motor and connected to the element via a wire. A passage for passing the wire may be provided between the motor and the speed reduction mechanism in the front-rear direction.

[0008] Effects of the Invention

[0009] According to the technology disclosed in this specification, it is possible to appropriately hold the lead wire connected to the element while suppressing an increase in the outer dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view showing the driver drill according to the embodiment, as seen from the front.

[0011] Figure 2 It is a perspective view showing the driver drill according to the embodiment when viewed from the rear.

[0012] Figure 3 It is a cross-sectional view showing the driver drill according to the embodiment.

[0013] Figure 4 It is a cross-sectional view showing a part of the driver drill according to the embodiment.

[0014] Figure 5 It is an exploded perspective view showing a motor, a motor bracket, and a speed reduction mechanism according to the embodiment, as seen from the rear.

[0015] Figure 6 It is a perspective view showing a part of the speed reduction mechanism according to the embodiment, as seen from the rear.

[0016] Figure 7 It is an exploded perspective view showing the speed reduction mechanism according to the embodiment, as seen from the rear.

[0017] Figure 8 It is an exploded perspective view showing the speed reduction mechanism according to the embodiment, as seen from the front.

[0018] Fig. 9 It is a cross-sectional view from above showing the moving structure of the speed switching lever according to the embodiment.

[0019] Fig.10 It is a cross-sectional view showing the vibration mechanism according to the embodiment.

[0020] Fig.11 It is a perspective view showing the left case and the motor bracket according to the embodiment, as seen from the rear.

[0021] Fig.12 It is a perspective view showing the motor bracket according to the embodiment when viewed from the rear.

[0022] Fig.13 It is a perspective view showing a part of the left housing according to the embodiment.

[0023] Fig.14 It is a cross-sectional view from the rear to the front, showing the path of the guide wire according to the embodiment.

[0024] Fig.15 This is a perspective view showing the driver drill according to the embodiment in a state where the handle is attached, as seen from the front.

[0025] Fig.16 It is a perspective explanatory diagram showing a mounting portion of a handle according to an embodiment.

[0026] Fig.17 This is a cross-sectional view from the rear to the front for explaining engagement between the handle and the mounting portion according to the embodiment.

[0027] Fig.18 It is a schematic diagram showing elements involved in other embodiments.

[0028] Fig.19 It is a schematic diagram showing elements involved in other embodiments.

[0029] Fig. 20 It is a perspective view showing a motor bracket according to another embodiment.

[0030] Fig.21 It is a left side view showing a motor bracket according to another embodiment.

[0031] Description of Reference Numerals

[0032] 1…driver drill, 2…housing, 2A…recessed portion, 2B…guide protrusion, 2C…support wall, 2L…left housing, 2R…right housing, 3…rear cover, 4…housing, 4A…first housing, 4B…second housing, 4C…motor bracket, 4D…stop plate, 4E, 4F, 4S…screw, 4H…through hole, 4J…through hole, 4K…guide groove, 4L…recessed portion, 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, 12C…monitoring sheet, 13…mode switching ring, 15…interface panel, 16…dial, 17…controller, 18…air intake port , 19…exhaust port, 20…battery pack, 21…motor storage portion, 21A…recess, 22…handle portion, 23…battery holding portion, 24…operating device, 25…display device, 26…controller housing, 27…panel opening, 28…dial opening, 30…speed reduction mechanism, 31…first planetary gear mechanism, 31S…pinion gear, 32…second planetary gear mechanism, 32A…pin, 32C…second gear frame, 32E…groove, 32F…cam gear, 32P…planetary gear, 32R…internal gear, 32S…sun gear, 33…third planetary gear mechanism, 33A…pin, 33C…third gear frame, 33F…cam gear, 33G…cam gear, 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...protrusion, 44...stop ring, 45...support ring, 46...steel ball, 47...washer, 48...cam ring, 50...element, 51...conducting 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 switching mechanism, 72...second speed switching mechanism, 81...main shaft, 81F...flange, 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…terminal portion, 103…band, 104…engaging convex portion, 110…fitting portion, 111…engaging concave portion, 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 gear frame, 311F…cam tooth, 311P…planetary gear, 311R…internal gear, 311S…large diameter portion, 312A…second pin, 312C…second stage gear frame,312F... Cam teeth, 312P... Planetary gears, 312R... Internal gears, 312S... Small diameter portion, 500... Change ring, 500A... Groove, 500B... Ring portion, 500C... Protrusion, 500D... Cam groove, 500E... Cam groove, 510... First switching wire, 520... Second switching wire, 530... Leaf spring, 530T... Protrusion, 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. , DETAILED DESCRIPTION

[0033] In one or more embodiments, the driver drill may include: a motor; an output portion, which is arranged in front of the motor and driven by the motor; a reduction mechanism, which is arranged between the motor and the output portion; a motor bracket, which is arranged between the motor and the reduction mechanism; a housing, which accommodates the motor and the motor bracket; an element, which is arranged above the motor or the reduction mechanism; and a wire, which is connected to the element and extends to a position below the motor or the reduction mechanism. The wire may be sandwiched between the housing and the motor bracket.

[0034] According to the above configuration, it is possible to appropriately hold the lead wire connected to the element while suppressing an increase in the outer dimensions.

[0035] In one or more embodiments, the drill driver may have a recessed portion on the inner surface of the housing for arranging the guide wire.

[0036] According to the above configuration, it is possible to effectively suppress the misalignment of the lead wire.

[0037] In one or more embodiments, the drill driver may include a convex portion on an outer periphery of the motor bracket that protrudes toward the concave portion.

[0038] According to the above configuration, it is possible to more effectively suppress the positional displacement of the lead wire between the concave portion and the convex portion.

[0039] In one or more embodiments, the protrusion may include a first protrusion and a second protrusion along the circumference of the motor bracket. In the radial direction relative to the rotating shaft of the motor, the distance from the rotating shaft to the end of the first protrusion may be smaller than the distance from the rotating shaft to the end of the second protrusion.

[0040] According to the above configuration, even when the convex portion is provided, the outer shape of the housing is unlikely to increase at the position where the first convex portion is formed, so that the size of the driver drill can be suppressed.

[0041] In one or more embodiments, the first protrusion may be disposed on a side surface of the motor bracket. The second protrusion may be disposed above or below the motor bracket relative to the first protrusion.

[0042] According to the above configuration, the width dimension of the driver drill can be suppressed.

[0043] In one or more embodiments, the driver drill may further include a vibration mechanism for vibrating the output portion.

[0044] According to the above configuration, drilling processing using vibration can be performed, and even in the case of vibration, displacement of the lead wire due to the vibration can be effectively suppressed.

[0045] In one or more embodiments, the speed reduction mechanism may be a multi-speed change. The driver drill may also include a speed switching lever disposed on the upper portion of the housing and switching the speed reduction ratio of the speed reduction mechanism. The element may include a sensor for detecting the switching of the speed reduction ratio by the speed switching lever.

[0046] According to the above configuration, the lead wire connected to the sensor in the upper portion of the housing can be appropriately held.

[0047] In one or more embodiments, the element may include a notification light for notifying the driving state of the motor.

[0048] According to the above configuration, the lead wire connected to the warning light can be appropriately held.

[0049] In one or more embodiments, the element may include an operation switch that receives an operation input.

[0050] According to the above configuration, the lead wire connected to the operation switch can be appropriately held.

[0051] In one or more embodiments, the vibration driver drill may include: a motor; an output portion, which is arranged in front of the motor and driven by the motor; a reduction mechanism, which is arranged between the motor and the output portion; a vibration mechanism, which is arranged between the reduction mechanism and the output portion; a motor bracket, which is arranged between the motor and the reduction mechanism; a housing, which accommodates the motor and the motor bracket; an element, which is arranged above the motor or the reduction mechanism; and a wire, which is connected to the element and extends to a position below the motor. The wire can be held by the motor bracket.

[0052] According to the above configuration, it is possible to appropriately hold the lead wire connected to the element while suppressing an increase in the outer dimensions, and to effectively suppress displacement of the lead wire due to vibration even in the case of vibration.

[0053] In one or more embodiments, the vibration driver drill may include: a motor; an output portion, which is arranged in front of the motor and driven by the motor; a speed reduction mechanism, which is arranged between the motor and the output portion; a vibration mechanism, which is arranged between the output portion and the speed reduction mechanism; a housing, which accommodates the motor and the speed reduction mechanism; an element, which is arranged above the motor and the speed reduction mechanism; and a controller, which is arranged below the motor and connected to the element via a wire. A passage for passing the wire may be provided between the motor and the speed reduction mechanism in the front-rear direction.

[0054] According to the above configuration, it is possible to appropriately hold the lead wire connected to the element while suppressing an increase in the outer dimensions, and to effectively suppress displacement of the lead wire due to vibration even in the case of vibration.

[0055] In one or more embodiments, the vibration driver drill may further include a motor bracket disposed between the motor and the speed reduction mechanism and positioning the motor and the speed reduction mechanism. The passage may be provided between the motor bracket and a housing surrounding the outer periphery of the motor bracket.

[0056] According to the above configuration, the path of the conductive wire can be constructed without increasing the number of components.

[0057] Hereinafter, the embodiments of the present disclosure will be described with reference to the accompanying drawings, but the present disclosure is not limited thereto. The structural elements of the embodiments described below can be combined as appropriate. In addition, some structural elements may not be used.

[0058] In the embodiments, the positional relationship of each part is described using terms such as left, right, front, rear, top, and bottom. The above terms indicate relative positions or directions with respect to the center of the driver drill.

[0059] In the embodiment, a direction parallel to the rotation axis AX of the motor is appropriately referred to as an axial direction, a direction around the rotation axis AX is appropriately referred to as a circumferential direction or a rotation direction, and a radial direction from the rotation axis AX is appropriately referred to as a radial direction.

[0060] In the embodiment, the rotation axis AX extends in the front-to-back direction. The axial direction coincides with the front-to-back direction. One side of the axial direction is the front, and the other side of the axial direction is the rear. In addition, in the radial direction, the position close to the rotation axis AX or the direction close to the rotation axis AX is appropriately referred to as the radial inner side, and the position away from the rotation axis AX or the direction of separation is appropriately referred to as the radial outer side.

[0061] [Overview of the driver drill]

[0062] Figure 1 It is a perspective view showing the driver drill 1 according to the embodiment, as seen from the front. Figure 2It is a perspective view showing the driver drill 1 according to the embodiment when viewed from the rear. Figure 3 1 is a cross-sectional view showing a driver drill according to the embodiment. In the embodiment, the driver drill 1 is a vibration driver drill. Figure 4 is a cross-sectional view showing a part of the driver drill 1 according to the embodiment

[0063] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the screwdriver drill 1 includes a shell 2, a rear cover 3, a housing 4, a battery assembly part 5, a motor 6, a power transmission mechanism 7, an output part 8, a fan 9, a trigger lever 10, a forward and reverse switching lever 11, a speed switching lever 12, a mode switching ring 13, an interface panel 15, a dial 16 and a controller 17.

[0064] The housing 2 is made of synthetic resin. In the 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 by screws 2S. The housing 2 is formed by fixing the left housing 2L and the right housing 2R.

[0065] The housing 2 has a motor housing portion 21 , a handle portion 22 , and a battery holding portion 23 .

[0066] The motor housing portion 21 houses the motor 6. The motor housing portion 21 is cylindrical and is arranged to cover the periphery of the motor 6.

[0067] The handle 22 is held by the operator. The handle 22 is disposed below the motor housing 21. The handle 22 extends downward from the motor housing 21. The trigger lever 10 is disposed in front of the handle 22.

[0068] The battery holder 23 accommodates the controller 17. The battery holder 23 is disposed at the lower portion of the handle 22. The battery holder 23 is connected to the lower end of the handle 22. The outer dimensions of the battery holder 23 are larger than those of the handle 22 in each of the front-rear direction and the left-right direction.

[0069] The rear cover 3 is made of synthetic resin. The rear cover 3 is arranged at the rear of the motor housing portion 21. The rear cover 3 is arranged to cover the rear portion of the motor 6. The rear cover 3 accommodates the fan 9. The rear cover 3 is arranged to cover the opening at the rear portion of the motor housing portion 21. The rear cover 3 is fixed to the motor housing portion 21 by screws 3S. The motor housing portion 21 and the rear cover 3 are surrounding parts that cover the periphery and the rear portion of the motor 6. In addition, the motor housing portion 21 and the rear cover 3 may also be integrated.

[0070] The motor housing portion 21 has an air inlet 18. The rear cover 3 has an air outlet 19. The air in the external space of the housing 2 flows into the internal space of the housing 2 through the air inlet 18. The air in the internal space of the housing 2 flows out to the external space of the housing 2 through the air outlet 19.

[0071] The housing 4 accommodates the power transmission mechanism 7. The housing 4 includes a first housing 4A, a second housing 4B and a motor bracket 4C. The second housing 4B is arranged in front of the first housing 4A. The mode switching ring 13 is arranged in front of the second housing 4B. The first housing 4A and the motor bracket 4C are made of synthetic resin. The second housing 4B is made of metal. In an embodiment, the second housing 4B is made of aluminum. The housing 4 is connected to the front of the motor housing portion 21. The first housing 4A and the second housing 4B are respectively cylindrical.

[0072] The first housing 4A is fixed to the rear end of the second housing 4B. The motor bracket 4C is configured to cover the opening of the rear end of the first housing 4A. The motor bracket 4C is fixed to the rear end of the first housing 4A by screws 4E. A stopper plate 4D is provided at the front end of the second housing 4B. The stopper plate 4D is configured to cover the opening of the front end of the second housing 4B. The stopper plate 4D is fixed to the front end of the second housing 4B by screws 4F.

[0073] The housing 4 is disposed so as to cover the front opening of the motor housing portion 21. The first housing 4A is disposed inside the motor housing portion 21. The second housing 4B is fixed to the motor housing portion 21 by screws 4S.

[0074] The battery assembly portion 5 is formed at the lower part of the battery holding portion 23. The battery assembly portion 5 is connected to the battery pack 20. The battery pack 20 is assembled to the battery assembly portion 5. The battery pack 20 can be detached from the battery assembly portion 5. The battery pack 20 includes a secondary battery. In the embodiment, the battery pack 20 includes a rechargeable lithium-ion battery. The battery pack 20 is assembled to the battery assembly portion 5 and 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.

[0075] 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 accommodated in the motor accommodation portion 21. The motor 6 has: a cylindrical stator 61; and a rotor 62, which is arranged 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.

[0076] The power transmission mechanism 7 is disposed in front of the motor 6. The power transmission mechanism 7 is accommodated in the housing 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.

[0077] The power transmission mechanism 7 includes a speed reduction mechanism 30 and a vibration mechanism 40 .

[0078] The speed reduction mechanism 30 reduces the speed of rotation of the rotor 62 (rotor shaft 63) and rotates the output portion 8 at a rotation speed lower than that of the rotor 62. In the embodiment, the speed reduction mechanism 30 includes a first planetary gear mechanism 31, a second planetary gear mechanism 32, and a third planetary gear mechanism 33. At least a portion of the first planetary gear mechanism 31 is configured to be forward of the motor 6. The second planetary gear mechanism 32 is configured to be forward of the first planetary gear mechanism 31. The third planetary gear mechanism 33 is configured to be forward of the second planetary gear mechanism 32. The first planetary gear mechanism 31 operates by utilizing the rotational force of the motor 6. The second planetary gear mechanism 32 operates by utilizing the rotational force of the first planetary gear mechanism 31. The third planetary gear mechanism 33 operates by utilizing the rotational force of the second planetary gear mechanism 32.

[0079] The vibration mechanism 40 vibrates the output portion 8 in the axial direction. The vibration mechanism 40 includes a first cam 41 , a second cam 42 , and a vibration switching ring 43 .

[0080] The output portion 8 is arranged forward of the motor 6. The output portion 8 rotates by the rotational force of the rotor 62. The output portion 8 rotates in a state where the end tool is mounted based on the rotational force transmitted from the rotor 62 via the power transmission mechanism 7. The output portion 8 includes: a main shaft 81 that rotates around the rotation axis AX based on the rotational force transmitted from the rotor 62; and a chuck 82 mounted on the front end of the main shaft 81. The end tool is held by the chuck 82. The front end of the chuck 82 is arranged forward of the housing 4. At least a portion of the main shaft 81 is arranged forward of the third planetary gear mechanism 33. The main shaft 81 is connected to the third planetary gear mechanism 33. The main shaft 81 rotates by 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.

[0081] The fan 9 is arranged at the rear of 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 due to the rotation of the rotor shaft 63. The fan 9 rotates together with the rotor shaft 63 as the rotor shaft 63 rotates. The fan 9 rotates so that the air in the external space of the housing 2 flows into the internal space of the housing 2 through the air inlet 18. The air flowing into the internal space of the housing 2 circulates in the internal space of the housing 2 to cool the motor 6. The air circulated in the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 19.

[0082] The trigger lever 10 is operated to start the motor 6. The trigger lever 10 is provided at the upper part of the handle portion 22. The front end of the trigger lever 10 protrudes forward from the front of the handle portion 22. The trigger lever 10 can move in the front-back direction. The trigger lever 10 is operated by the operator. The motor 6 is started by operating the trigger lever 10 in a manner of moving backward. The motor 6 is stopped by releasing the operation of the trigger lever 10.

[0083] 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 at the upper portion of the handle portion 22. The left end portion of the forward / reverse switching lever 11 protrudes to the left from the left portion of the handle portion 22. The right end portion of the forward / reverse switching lever 11 protrudes to the right from the right portion of the handle portion 22. The forward / reverse switching lever 11 can move in the left-right direction. The forward / reverse switching lever 11 is operated by an operator. The motor 6 is rotated in the forward direction by operating the forward / reverse switching lever 11 to move to the left. The motor 6 is rotated in the reverse direction by operating the forward / reverse switching lever 11 to move to the right. The rotation direction of the main shaft 81 is switched by switching the rotation direction of the motor 6.

[0084] The speed switching lever 12 is operated to change the speed mode (gear shifting gear) of the reduction mechanism 30. The speed switching lever 12 is provided at the upper portion of the motor housing portion 21. The speed switching lever 12 can be moved in the front-rear direction. The speed switching lever 12 is operated by the operator. The speed mode (gear shifting gear) of the reduction mechanism 30 includes a low speed mode (gear shifting gear), a medium speed mode (gear shifting gear) and a high speed mode (gear shifting gear). That is, the number of gear shifting gears of the reduction mechanism 30 is three gears. The reduction mechanism 30 is a reduction mechanism with three gear shifting gears.

[0085] The low speed mode refers to a speed mode in which the output unit 8 is rotated at a first rotational speed (low speed) while the rotor 62 is rotating at a constant rotational speed. The medium speed mode refers to a speed mode in which the output unit 8 is rotated at a second rotational speed (medium speed) higher than the first rotational speed while the rotor 62 is rotating at a constant rotational speed. The high speed mode refers to a speed mode in which the output unit 8 is rotated at a third rotational speed (high speed) higher than the second rotational speed while the rotor 62 is rotating at a constant rotational speed. The movable range of the speed switching lever 12 is defined 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 in a manner moving toward the front 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 in a manner moving toward the middle 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 in a manner moving toward the rear of the movable range.

[0086] The mode switching ring 13 is operated to change the operating mode of the vibration mechanism 40. The mode switching ring 13 is arranged in front of the housing 4. The mode switching ring 13 is rotatable. The mode switching ring 13 is operated by the operator. The operating mode of the vibration mechanism 40 includes a vibration mode and a non-vibration mode. The vibration mode refers to an operating mode in which the output part 8 is vibrated in the axial direction. The non-vibration mode refers to an operating mode in which the output part 8 is not vibrated in the axial direction. The operating mode of the vibration mechanism 40 is set to the vibration mode by operating the mode switching ring 13 in a manner configured at the vibration mode position in the rotation direction. The operating mode of the vibration mechanism 40 is set to the non-vibration mode by operating the mode switching ring 13 in a manner configured at the non-vibration mode position in the rotation direction.

[0087] The interface panel 15 is provided in the battery holding portion 23. The interface panel 15 includes an operating device 24 and a display device 25. The interface panel 15 is plate-shaped. The operating device 24 includes an operating button. As the display device 25, 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 configured with a plurality of light emitting diodes can be exemplified.

[0088] The battery holding portion 23 is formed with a panel opening 27 . The panel opening 27 is formed on the upper surface of the battery holding portion 23 at a position forward of the handle portion 22 . At least a portion of the interface panel 15 is disposed in the panel opening 27 .

[0089] The operating device 24 is operated to change the driving mode of the motor 6. The operating device 24 is operated by the operator. The driving mode of the motor 6 includes a drill mode and a clutch mode. The drill mode refers to a driving mode in which the motor 6 is driven regardless of the torque acting on the motor 6 during the driving process of the motor 6. The clutch mode refers to a driving mode in which the motor 6 is stopped when the torque acting on the motor 6 exceeds the current threshold during the driving process of the motor 6.

[0090] The dial 16 is operated to change the driving condition of the motor 6. The dial 16 is arranged in front of the battery holding part 23. The dial 16 is supported by the battery holding part 23 in a rotatable manner. The dial 16 can rotate more than 360 [°]. The dial 16 is operated by the operator. The driving condition of the motor 6 includes a current threshold. In the clutch mode set by the operating device 24, the dial 16 is operated to change the current threshold.

[0091] The battery holding portion 23 has a dial opening 28 formed therein. The dial opening 28 is formed at the right portion of the front portion of the battery holding portion 23. At least a portion of the dial 16 is disposed in the dial opening 28.

[0092] The controller 17 includes a computer system. The controller 17 outputs a control command for controlling the motor 6. At least a part of the controller 17 is housed in the controller housing 26. The controller 17 is housed in the battery holding portion 23 while being held in the controller housing 26. The controller 17 includes a circuit substrate on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit substrate include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or a storage, a volatile memory such as a RAM (Random Access Memory), a transistor, a capacitor, and a resistor.

[0093] The controller 17 sets the driving condition of the motor 6 based on the operation of the dial 16. As described above, the driving condition of the motor 6 includes a current threshold value. The controller 17 sets the current threshold value based on the operation of the dial 16 in the clutch mode.

[0094] Furthermore, in the clutch mode, when the torque acting on the motor 6 exceeds a set current threshold value during the driving of the motor 6 , the controller 17 stops the motor 6 .

[0095] In addition, the controller 17 causes the display device 25 to display the set driving conditions of the motor 6 .

[0096] [Motor and power transmission mechanism]

[0097] like Figure 4As shown, the motor 6 includes 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.

[0098] The stator 61 has: a stator core 61A, which includes a plurality of stacked steel plates; a front insulator 61B, which is arranged at the front of the stator core 61A; a rear insulator 61C, which is arranged at the rear of the stator core 61A; a plurality of coils 61D, which are wound around the stator core 61A via the front insulator 61B and the rear insulator 61C; a sensor circuit substrate, which is mounted on the front insulator 61B; and a short-circuit component, which is supported by the front insulator 61B. The sensor circuit substrate has a plurality of rotation detection elements for detecting the rotation of the rotor 62. The rotation detection element of the sensor circuit substrate detects the rotation of the rotor 62 by detecting the magnetic field of the permanent magnet 62B. The controller 17 supplies a driving current to the coil 61D based on the detection data of the rotation detection element. The short-circuit component connects the plurality of coils 61D via a fuse terminal. The short-circuit component is connected to the controller 17 via a wire.

[0099] The rotor 62 rotates around the rotation axis AX. The rotor 62 has: a rotor shaft 63; a rotor core 62A, which is arranged around the rotor shaft 63; and a plurality of permanent magnets 62B, which are retained by the rotor core 62A. The rotor core 62A is cylindrical. The rotor core 62A includes a plurality of stacked 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 respectively arranged in the plurality of through holes of the rotor core 62A.

[0100] The rotor shaft 63 rotates around the rotation axis AX. The rotation axis AX of the rotor shaft 63 coincides with the rotation axis of the output unit 8. The front portion of the rotor shaft 63 is rotatably supported by a bearing 64. The 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. The front end portion of the rotor shaft 63 is disposed in front of the bearing 64. The front end portion of the rotor shaft 63 is disposed in the internal space of the housing 4.

[0101] A pinion gear 31S is provided at the front end portion 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 speed reduction mechanism 30 via the pinion gear 31S.

[0102] Figure 51 is an exploded perspective view showing the motor 6, the motor bracket 4C and the reduction mechanism 30 involved in the embodiment as viewed from the rear. The motor bracket 4C is arranged between the motor 6 and the reduction mechanism 30. The rotor shaft 63 of the motor 6 passes through the motor bracket 4C and is connected to the reduction mechanism 30 (pinion 31S). A main shaft 81 is arranged in front of the reduction mechanism 30. The main shaft 81 is connected to the third gear frame 33C of the reduction mechanism 30. In the embodiment, a pair of flat surfaces 81T are formed on the outer peripheral surface of the main shaft 81. The flat surface 81T is parallel to the rotation axis AX. The pair of flat surfaces 81T face opposite directions to each other. The third gear frame 33C is arranged around the main shaft 81. The inner peripheral surface of the third gear frame 33C includes a supporting surface that contacts the pair of flat surfaces 81T respectively. The relative rotation of the third gear frame 33C and the main shaft 81 is suppressed by the flat surface 81T. The main shaft 81 rotates together with the third gear frame 33C due to the rotation of the third gear frame 33C.

[0103] like Figure 4 As shown in FIG. 1 , the main shaft 81 is rotatably supported by the bearings 83 and 84 . The main shaft 81 is movable in the front-rear direction while being supported by the bearings 83 and 84 .

[0104] The main shaft 81 has a flange portion 81F. A coil spring 87 is disposed between the flange portion 81F and the bearing 83. The flange portion 81F is in contact with the front end portion of the coil spring 87. The coil spring 87 generates an elastic force that moves the main shaft 81 forward.

[0105] The chuck 82 can hold the end tool. The chuck 82 is connected to the front portion of the spindle 81. A screw hole 81R is provided at the front end portion of the spindle 81. The spindle 81 rotates to rotate the chuck 82. The chuck 82 rotates while holding the end tool.

[0106] Figure 6 It is a perspective view showing a part of the speed reduction mechanism 30 according to the embodiment, as seen from the rear.

[0107] The speed switch lever 12 is operated to change the speed mode of the speed reduction mechanism 30. The speed switch lever 12 is mechanically connected to the speed reduction mechanism 30. The speed switch lever 12 is provided above the housing 4 (see Figure 1). The speed switching lever 12 can move in the front-rear direction. The speed switching lever 12 is operated by the operator. The speed mode of the reduction mechanism 30 includes a low speed mode (1st gear), a medium speed mode (2nd gear) and a high speed mode (3rd gear). The speed mode of the reduction mechanism 30 is set to the low speed mode (1st gear) by operating the speed switching lever 12 in a manner moving toward the front of the movable range. The speed mode of the reduction mechanism 30 is set to the medium speed mode (2nd gear) by operating the speed switching lever 12 in a manner moving toward the middle of the movable range. The speed mode of the reduction mechanism 30 is set to the high speed mode (3rd gear) by operating the speed switching lever 12 in a manner moving toward the rear of the movable range.

[0108] Figure 7 It is an exploded perspective view showing the speed reduction mechanism according to the embodiment, as seen from the rear. Figure 8 1 is an exploded perspective view showing the speed reduction mechanism according to the embodiment as seen from the front. The teeth of the sun gears 32S and 33S are simplified and shown in a cylindrical shape.

[0109] The first planetary gear mechanism 31 includes: a planetary gear 311P; a planetary gear 312P, which is arranged in front of the planetary gear 311P; a first-stage gear frame 311C, which supports the plurality of planetary gears 311P and the plurality of planetary gears 312P respectively; a second-stage gear frame 312C, which supports the plurality of planetary gears 312P respectively; an internal gear 311R, which is arranged around the plurality of planetary gears 311P; and an internal gear 312R, which is arranged around the plurality of planetary gears 312P. A pinion 31S is provided at the front end of the rotor shaft 63. The pinion 31S functions as a sun gear of the first planetary gear mechanism 31. The pinion 31S is arranged in front of the stator 61. The pinion 31S rotates with the aid of the rotor 62. The pinion 31S can rotate directly or indirectly with the aid of the rotor 62.

[0110] 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 gear carrier 32C supporting the plurality of planetary gears 32P; and an internal gear 32R arranged around the plurality of planetary gears 32P. The sun gear 32S is arranged in front of the internal gear 311R and the internal gear 312R. The sun gear 32S can rotate directly or indirectly with the help of the planetary gears 311P and the planetary gears 312P. The planetary gears 32P mesh with the sun gear 32S. The internal gear 32R meshes with the planetary gears 32P.

[0111] The third planetary gear mechanism 33 includes a sun gear 33S, a plurality of planetary gears 33P arranged around the sun gear 33S, a third carrier 33C supporting the plurality of planetary gears 33P, and an internal gear 33R arranged around the plurality of planetary gears 33P.

[0112] A plurality of planetary gears 311P of the first planetary gear mechanism 31 are arranged around the large diameter portion 311S of the pinion gear 31S. A plurality of planetary gears 312P are arranged around the small diameter portion 312S of the pinion gear 31S.

[0113] The housing 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 main shaft 81 is disposed in front of the internal gear 33R. The main shaft 81 may rotate directly or indirectly via the planetary gear 33P.

[0114] The planetary gear 311P is supported by the first pin 311A ​​so as to be rotatable. The first pin 311A ​​is supported by the first-stage gear frame 311C. The first pin 311A ​​protrudes rearward from the rear surface of the first-stage gear frame 311C. A plurality of first pins 311A ​​are provided at intervals in the circumferential direction. In an embodiment, four first pins 311A ​​are provided at equal intervals in the circumferential direction. The planetary gear 311P is supported one by one by a plurality of (4) first pins 311A. The planetary gear 311P is configured to be more rearward than the first-stage gear frame 311C. The first-stage gear frame 311C supports the planetary gear 311P so as to be rotatable by means of the first pin 311A.

[0115] The planetary gear 312P is supported by the second pin 312A so as to be rotatable. The second pin 312A is supported by the first-stage gear frame 311C and the second-stage gear frame 312C, respectively. The first-stage gear frame 311C is arranged to be rearward of the second-stage gear frame 312C. The rear end of the second pin 312A is supported by the first-stage gear frame 311C. The front end of the second pin 312A is supported by the second-stage gear frame 312C. A plurality of second pins 312A are arranged at intervals in the circumferential direction. In an embodiment, four second pins 312A are arranged at equal intervals in the circumferential direction. In the circumferential direction, the position of the first pin 311A ​​is different from the position of the second pin 312A. In the circumferential direction, the second pin 312A is arranged between a pair of first pins 311A ​​adjacent to each other. The planetary gear 312P is supported by a plurality of (4) second pins 312A, one by one. In the front-rear direction (axial direction), the planetary gear 312P is arranged between the first stage gear carrier 311C and the second stage gear carrier 312C. The first stage gear carrier 311C and the second stage gear carrier 312C respectively support the planetary gear 312P rotatably via the second pins 312A. Gears are provided on the outer periphery of the second stage gear carrier 312C.

[0116] The internal gear 311R is arranged around the plurality of planetary gears 311P. The internal gear 312R is arranged around the plurality of planetary gears 312P. The outer diameter of the planetary gear 311P is smaller than the outer diameter of the planetary gear 312P.

[0117] The sun gear 32S of the second planetary gear mechanism 32 is arranged in front of the second-stage gear frame 312C. The diameter of the sun gear 32S is smaller than the diameter of the second-stage gear frame 312C. The second-stage gear frame 312C and the sun gear 32S are integrated. The second-stage gear frame 312C and the sun gear 32S rotate together. The pin 32A is provided on the second gear frame 32C. The planetary gear 32P is supported by the pin 32A so as to be rotatable. The second gear frame 32C supports the planetary gear 32P so as to be rotatable by means of the pin 32A.

[0118] The sun gear 33S of the third planetary gear mechanism 33 is arranged in front of the second gear frame 32C. The diameter of the sun gear 33S is smaller than the diameter of the second gear frame 32C. The second gear frame 32C and the sun gear 33S are integrated. The second gear frame 32C and the sun gear 33S rotate together. The pin 33A is provided on the third gear frame 33C. The planetary gear 33P is supported by the pin 33A so as to be rotatable. The third gear frame 33C supports the planetary gear 33P so as to be rotatable by means of the pin 33A.

[0119] like Figure 6 As shown, the speed reduction mechanism 30 includes a first speed switching mechanism 71 and a second speed switching mechanism 72 .

[0120] The first speed switching mechanism 71 switches between a first reduction mode and a second reduction mode. In the first reduction mode, the internal gear 312R of the first planetary gear mechanism 31 is prevented from rotating and the internal gear 311R is allowed to rotate. In the second reduction mode, the internal gear 311R of the first planetary gear mechanism 31 is prevented from rotating and the internal gear 312R is allowed to rotate.

[0121] The first speed switching mechanism 71 includes a change ring 500 , a first switching wire 510 , a first movable member 610 , and a first spring 630 .

[0122] The conversion ring 500 includes an annular portion 500B and a plurality of convex portions 500C fixed to the annular portion 500B. The convex portions 500C are arranged in the guide grooves 4K (see FIG. 4 ) provided on the inner peripheral surface of the first housing 4A. Figure 5 ). The guide groove 4K extends in the front-to-back direction. The protrusion 500C is arranged in the guide groove 4K of the first housing 4A to suppress the relative rotation of the conversion ring 500 with respect to the first housing 4A. The conversion ring 500 can move in the front-to-back direction inside the first housing 4A. The conversion ring 500 can move in the front-to-back direction while the protrusion 500C is guided by the guide groove 4K. The conversion ring 500 is arranged around at least one of the internal gear 311R and the internal gear 312R.

[0123] The change ring 500 is connected to the first switching wire 510. The change ring 500 can move in the front-rear direction inside the first housing 4A. The change ring 500 moves forward to the first deceleration mode, and moves backward to the second deceleration mode.

[0124] Regarding the first planetary gear mechanism 31, the reduction ratio of the front stage portion composed of the planetary gear 312P and the internal gear 312R is greater than the reduction ratio of the rear stage portion composed of the planetary gear 311P and the internal gear 311R. When the pinion 31S rotates at a constant speed, the rotation speed of the second stage gear frame 312C in the first reduction mode is slower than the rotation speed of the second stage gear frame 312C in the second reduction mode.

[0125] In the embodiment, the reduction ratios of the second planetary gear mechanism 32 and 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 that of the third planetary gear mechanism 33.

[0126] like Figure 5 and Figure 6As shown, the first switching wire 510 is arranged on the outside of the first housing 4A. The first switching wire 510 can move in the front-to-back direction on the outside of the first housing 4A. The terminal end of the first switching wire 510 is inserted into the groove 500A provided in the conversion ring 500. A through hole 4H is provided in the first housing 4A. The terminal end of the first switching wire 510 is arranged on the inside of the first housing 4A by means of the through hole 4H. The terminal end of the first switching wire 510 is inserted into the groove 500A on the inside of the first housing 4A. The upper part of the first switching wire 510 is fixed to the first movable part 610. The first movable part 610 is connected to the speed switching lever 12. The first movable part 610 is guided in the front-to-back direction by the guide rod 600. The guide rod 600 is configured to extend in the front-to-back direction. The guide rod 600 is fixed to the housing 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 housing 4B. A first guide hole extending in the front-to-back direction is formed in the first movable part 610. The guide rod 600 passes through the first guide hole of the first movable part 610. The first spring 630 is a compression spring. The rear end of the first spring 630 is supported on the motor bracket 4C. The front end of the first spring 630 is connected to the first movable part 610. The first spring 630 generates an elastic force in such a way that the first movable part 610 moves forward (in one direction). The first spring 630 applies force to the conversion ring 500 forward with the help of the first movable part 610 and the first switching wire 510.

[0127] like Figure 8 As shown, a plurality of cam teeth 311F are provided on the outer circumferential surface of the internal gear 311R. A plurality of cam teeth 312F are provided on the outer circumferential surface of the internal gear 312R. A cam groove 500D and a cam groove 500E are provided on the inner circumferential surface of the conversion ring 500. The cam groove 500D is formed at the rear end portion of the conversion ring 500 and engages with the cam teeth 311F of the internal gear 311R. The cam groove 500E is formed at the front end portion of the conversion ring 500 and engages with the cam teeth 312F of the internal gear 312R. The conversion 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 housing 4A.

[0128] The change ring 500 is connected to the speed switch lever 12 via the first switch wire 510 and the first movable member 610. The speed switch lever 12 is operated in such a manner that the first movable member 610 moves in the front-rear direction. By operating the speed switch lever 12 in such a manner that it moves in the front-rear direction, the first movable member 610 and the first switch wire 510 move in the front-rear direction, and the change ring 500 moves in the front-rear direction.

[0129] If the first movable member 610, the first switching wire 510, and the conversion ring 500 move forward so that the conversion ring 500 is arranged around the internal gear 312R, the cam groove 500E engages with the cam teeth 312F. As a result, the rotation of the internal gear 312R is prevented. That is, the first planetary gear mechanism 31 is changed to the first reduction mode by the first movable member 610, the first switching wire 510, and the conversion ring 500 moving forward to prevent the rotation of the internal gear 312R.

[0130] If the first movable member 610, the first switching wire 510, and the conversion ring 500 move backward so that the conversion ring 500 is arranged around the internal gear 311R, the cam groove 500D engages with the cam teeth 311F. As a result, the rotation of the internal gear 311R is prevented. That is, the first planetary gear mechanism 31 is changed to the second reduction mode by preventing the rotation of the internal gear 311R by moving the first movable member 610, the first switching wire 510, and the conversion ring 500 backward.

[0131] The second speed switching mechanism 72 switches between an effective mode in which the deceleration function of the second planetary gear mechanism 32 is effective and an ineffective mode in which the deceleration function of the second planetary gear mechanism 32 is ineffective. Setting the second planetary gear mechanism 32 to the effective mode includes preventing the internal gear 32R from rotating. Setting the second planetary gear mechanism 32 to the ineffective mode includes allowing the internal gear 32R to rotate. The second planetary gear mechanism 32 is changed to the effective mode by preventing the internal gear 32R from rotating. The second planetary gear mechanism 32 is changed to the ineffective mode by allowing the internal gear 32R to rotate.

[0132] like Figure 5 and Figure 6 As shown, the second speed switching mechanism 72 includes: a second switching wire 520 connected to the internal gear 32R; a cam tooth 33F provided on the internal gear 33R; a second movable member 620; and a second spring 640.

[0133] The second switching wire 520 is arranged on the outside of the first housing 4A. The second switching wire 520 can move in the front-to-back direction on the outside of the first housing 4A. The terminal end of the second switching wire 520 is inserted into the groove 32E provided in the internal gear 32R. The first housing 4A is provided with a through hole 4J. The terminal end of the second switching wire 520 is arranged on the inside of the first housing 4A by means of the through hole 4J. The terminal end of the second switching wire 520 is inserted into the groove 32E on the inside of the first housing 4A. The upper part of the second switching wire 520 is fixed to the second movable part 620. The second movable part 620 is connected to the speed switching lever 12. The second movable part 620 is arranged to be closer to the front than the first movable part 610. The second movable part 620 is guided in the front-to-back direction by the guide rod 600. A second guide hole extending in the front-to-back direction is formed in the second movable part 620. The guide rod 600 penetrates the second guide hole of the second movable part 620. The second spring 640 is a compression spring. The front end of the second spring 640 is supported by the second housing 4B. The rear end of the second spring 640 is connected to the second movable member 620. The second spring 640 generates elastic force to move the second movable member 620 backward. The second spring 640 applies force to the inner gear 32R backward through the second movable member 620 and the second switching wire 520.

[0134] like Figure 7 As shown, a plurality of cam teeth 32F are provided on the outer circumference of the internal gear 32R. The cam teeth 32F can mesh with the cam teeth 33F on the inner circumference of the internal gear 33R. The internal gear 32R is inserted inside the internal gear 33R, and the cam teeth 33F of the internal gear 33R prevent the internal gear 32R from rotating.

[0135] The internal gear 33R is arranged in front of the internal gear 32R. The internal gear 33R is fixed to the second housing 4B. Cam teeth 33G are provided on the outer peripheral surface of the internal gear 33R. The cam teeth 33G are inserted into the recessed portion 4L provided on the inner peripheral surface of the second housing 4B. The cam teeth 33G are inserted into the recessed portion 4L to suppress the relative movement of the internal gear 33R and the second housing 4B.

[0136] The speed switch lever 12 is operated so that the second movable member 620 moves in the front-rear direction. By operating the speed switch lever 12 so that it moves in the front-rear direction, the second movable member 620 and the second switch wire 520 move in the front-rear direction, and the internal gear 32R moves in the front-rear direction. By the movement of the internal gear 32R in the front-rear direction, the state in which the internal gear 32R is inserted into the internal gear 33R and the state in which it is separated from the internal gear 33R are switched.

[0137] The second movable member 620, the second switching wire 520, and the internal gear 32R move forward so that at least a portion of the internal gear 32R is inserted into the inner side of 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. That is, the second movable member 620, the second switching wire 520, and the internal gear 32R move forward to prevent the internal gear 32R from rotating, so that the second planetary gear mechanism 32 is changed to the effective mode.

[0138] The second movable member 620, the second switching wire 520, and the internal gear 32R move backward, so that the internal gear 32R is disengaged from the inner side 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 are separated, thereby allowing the internal gear 32R to rotate. That is, the second movable member 620, the second switching wire 520, and the internal gear 32R move backward to allow the internal gear 32R to rotate, so that the second planetary gear mechanism 32 is changed to the ineffective mode.

[0139] When the second planetary gear mechanism 32 is in the effective mode, the internal gear 32R meshes with only the planetary gears 32P. When the second planetary gear mechanism 32 is in the ineffective mode, the internal gear 32R meshes with both the planetary gears 32P and the gears on the outer peripheral portion of the second-stage carrier 312C.

[0140] As described above, in the embodiment, the speed modes of the speed reduction mechanism 30 include the low speed mode (1st gear), the medium speed mode (2nd gear), and the high speed mode (3rd gear).

[0141] The low speed mode includes setting the first planetary gear mechanism 31 to the first reduction mode and setting the second planetary gear mechanism 32 to the effective mode. The speed switching lever 12 is operated to move to the front of the movable range so that the second movable member 620 moves forward, thereby setting the first planetary gear mechanism 31 to the first reduction mode and setting the second planetary gear mechanism 32 to the effective mode. That is, in the low speed mode (1st gear), 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 (made effective).

[0142] The medium speed mode includes setting the first planetary gear mechanism 31 to the first reduction mode and setting the second planetary gear mechanism 32 to the ineffective mode. The speed switching lever 12 is operated to move to the middle part of the movable range to set the first planetary gear mechanism 31 to the first reduction mode and the second planetary gear mechanism 32 to the ineffective mode. That is, in the medium speed mode (second gear), the front stage (second stage) of the first planetary gear mechanism 31 and the third planetary gear mechanism 33 are used (made effective).

[0143] The high speed mode includes setting the first planetary gear mechanism 31 to the second reduction mode and setting the second planetary gear mechanism 32 to the invalid mode. The speed switching lever 12 is operated to move to the rear of the movable range so that the first movable member 610 moves backward, thereby setting the first planetary gear mechanism 31 to the second reduction mode and setting the second planetary gear mechanism 32 to the invalid mode. That is, in the high speed mode (3rd gear), the rear stage (first stage) of the first planetary gear mechanism 31 and the third planetary gear mechanism 33 are used (made effective).

[0144] The speed switching lever 12 is operated by the operator so that the first movable member 610 moves in the front-to-back direction. The first movable member 610 moves in the front-to-back direction while being guided by the guide rod 600. The speed switching lever 12 is operated by the operator so that the second movable member 620 moves in the front-to-back direction. The second movable member 620 moves in the front-to-back 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.

[0145] Fig. 9 1 is a cross-sectional view showing the moving structure of the speed switch lever 12 according to the embodiment as viewed from above. When the speed reduction mechanism 30 is set from the medium speed mode (2nd gear) to the low speed mode (1st gear), the operator operates the speed switch lever 12 to move the speed switch lever 12 forward by overcoming the elastic force (acting force) of the second spring 640. The speed switch lever 12 moves forward, so that the second movable member 620 moves forward by overcoming the elastic force of the second spring 640. Fig. 9 As shown, a pair of wall portions 12A and 12B are provided on the lower surface of the speed switch lever 12. The pair of wall portions 12A and 12B are arranged 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 wall portions 12A and 12B. The convex portion 530T of the leaf spring 530 is inserted into the concave portion 21A provided in a part of the motor housing portion 21, thereby positioning the speed switch lever 12 at the position of the first gear. The concave portion 21A is provided at each position of the first gear, the second gear, and the third gear.

[0146] When the speed reduction mechanism 30 is changed from the medium speed mode (2nd gear) to the high speed mode (3rd gear), the operator operates the speed switching lever 12 to move the speed switching lever 12 rearward against the elastic force (acting force) of the first spring 630. The convex portion 530T of the leaf spring 530 is inserted into the concave portion 21A formed at the position of the 3rd gear, so that the speed switching lever 12 is positioned at the position of the 3rd gear.

[0147] Similarly, when the speed reduction mechanism 30 is set from the low speed mode (1st gear) to the medium speed mode (2nd gear), the operator operates the speed switch lever 12 to move the speed switch lever 12 backward. When the speed reduction mechanism 30 is set from the high speed mode (3rd gear) to the medium speed mode (2nd gear), the operator operates the speed switch lever 12 to move the speed switch lever 12 forward. The convex portion 530T of the leaf spring 530 is inserted into the concave portion 21A formed at the position of the 2nd gear, so that the speed switch lever 12 is positioned at the position of the 2nd gear.

[0148] Fig.10 4B is a cross-sectional view showing the vibration mechanism 40 according to the embodiment. The vibration mechanism 40 is arranged around the main shaft 81. The first cam 41 and the second cam 42 of the vibration mechanism 40 are respectively arranged inside the second housing 4B. In the front-rear direction, the first cam 41 and the second cam 42 are respectively arranged between the bearing 83 and the bearing 84.

[0149] The first cam 41 is annular. The first cam 41 is arranged around the main shaft 81. The first cam 41 is fixed to the main shaft 81. The first cam 41 rotates together with the main shaft 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 main shaft 81. In the front-to-back direction, the stop ring 44 is arranged between the first cam 41 and the bearing 83.

[0150] The second cam 42 is annular. The second cam 42 is arranged behind the first cam 41. The second cam 42 is arranged around the main shaft 81. The second cam 42 can rotate relative to the main shaft 81. Cam teeth are provided on the front surface of the second cam 42. The cam teeth on the front surface of the second cam 42 mesh with the cam teeth on the rear surface of the first cam 41. A claw is provided on the rear surface of the second cam 42.

[0151] In the front-to-back direction, a support ring 45 is arranged between the second cam 42 and the bearing 84. The support ring 45 is arranged on the inner side of the second housing 4B. The support ring 45 is fixed to the second housing 4B. A plurality of steel balls 46 are arranged on the front surface of the support ring 45. A spacer 47 is arranged between the steel balls 46 and the second cam 42. The second cam 42 can rotate in a state where the front-to-back movement is restricted in the space defined by the support ring 45 and the spacer 47.

[0152] The vibration switching ring 43 switches between the vibration mode and the non-vibration mode. The mode switching ring 13 is connected to the vibration switching ring 43 by means of the cam ring 48. The mode switching ring 13 and the cam ring 48 can rotate integrally. 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 housing 4B. The rotation of the vibration switching ring 43 is limited by the protrusion 43T. The vibration switching ring 43 is arranged around the first cam 41 and the second cam 42. In addition, the vibration switching ring 43 has an opposing portion 43S opposed to the rear surface of the second cam 42. The opposing portion 43S protrudes radially inward from the rear of the vibration switching ring 43.

[0153] The vibration switching ring 43 can move in the front-to-back direction while being guided by the guide hole provided in the second housing 4B. The vibration switching ring 43 is pressed by the cam ring 48 and moves backward as the mode switching ring 13 rotates. The vibration switching ring 43 is urged forward by the spring 43A. If the mode switching ring 13 is returned and the pressing by the cam ring 48 is released, the vibration switching ring 43 is pressed by the spring 43A and restored to the forward position. The vibration switching ring 43 is moved in the front-to-back direction by the operator operating the mode switching ring 13. The vibration mode and the non-vibration mode are switched by the vibration switching ring 43 moving in the front-to-back direction between the forward position and the retreat position which is rearward of the forward position. The vibration mode and the non-vibration mode are switched by operating the mode switching ring 13.

[0154] The vibration mode includes a state where the rotation of the second cam 42 is restricted. If 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 where the rotation of the second cam 42 is allowed. If the vibration switching ring 43 moves to the backward position, the rotation of the second cam 42 is allowed.

[0155] In the vibration mode, at least a portion of the vibration switching ring 43 that is pressed by the spring 43A and moves to the forward position contacts the second cam 42. The vibration switching ring 43 contacts the second cam 42 to restrict the rotation of the second cam 42. If the vibration switching ring 43 moves to the forward position, the claw on the rear surface of the second cam 42 contacts the opposing portion 43S of the vibration switching ring 43. Thus, the rotation of the second cam 42 is restricted. In a state where the rotation of the second cam 42 is restricted, if the motor 6 is driven, the first cam 41 fixed to the main shaft 81 rotates while contacting the cam teeth of the second cam 42. Thus, the main shaft 81 rotates while vibrating in the front-to-back direction.

[0156] In the non-vibration mode, the vibration switching ring 43, which is pressed by the cam ring 48 and moved to the retreat position, is separated from the second cam 42. If the vibration switching ring 43 moves to the retreat position, the opposing portion 43S of the vibration switching ring 43 is separated from the second cam 42. The second cam 42 is allowed to rotate by separating the vibration switching ring 43 from the second cam 42. In the state where the second cam 42 is allowed to rotate, if the motor 6 is driven, the second cam 42 rotates together with the first cam 41 and the main shaft 81. As a result, the main shaft 81 rotates without vibrating in the front-rear direction.

[0157] [Components and wires]

[0158] Fig.11 2 is a perspective view showing the left housing 2L and the motor bracket 4C according to the embodiment as viewed from the rear. Fig.11 As shown, the driver drill 1 includes: an element 50; and a lead wire 51 connected to the element 50. The element 50 includes a sensor for detecting the switching of the speed reduction ratio by the speed switching lever 12.

[0159] like Fig. 9 As shown, a monitoring piece 12C is provided on the wall portion 12A of the speed switching lever 12. The element 50 is arranged directly below the wall portion 12A. In the embodiment, the monitoring piece 12C is a permanent magnet and the element 50 is a magnetic sensor. Figure 6 As shown, the element 50 is formed as a circuit substrate assembled with a magnetic sensor. A wire 51 is connected to the circuit substrate. The element 50 monitors the magnetic force generated by the monitoring piece 12C. The element 50 is connected to the controller 17 by means of the wire 51. The element 50 outputs a monitoring signal of the magnetic force to the controller 17. When the speed switch lever 12 is in the low speed mode (1st gear), when the speed switch lever 12 is in the medium speed mode (2nd gear), and when the speed switch lever 12 is in the high speed mode (3rd gear), the position of the monitoring piece 12C is different. Depending on the position of the monitoring piece 12C, the monitoring signal output by the element 50 is different. The controller 17 monitors which mode the speed switch lever 12 is in based on the change of the monitoring signal.

[0160] The element 50 is disposed above the motor 6 or the speed reduction mechanism 30. The element 50 is located between the speed switching lever 12 and the speed reduction mechanism 30 in the vertical direction. The element 50 is fixed to the left housing 2L. Fig.11As shown, the wire 51 is connected to the element 50 and extends to a position below the motor 6 or the reduction mechanism 30. One end of the wire 51 is connected to the element 50, and the other end of the wire 51 is connected to the controller 17. The wire 51 passes downward from the left side of the motor housing portion 21 (a space where the motor 6, the motor bracket 4C, and the reduction mechanism 30 are arranged) along the inner surface of the left housing 2L from the upper part of the left housing 2L. The wire 51 extends to the controller 17 provided in the battery holding portion 23 below the motor 6.

[0161] 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 arranged 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 area formed by the motor bracket 4C and the left housing 2L and along the inner surface of the left housing 2L.

[0162] Fig.12 It is a perspective view showing the motor bracket 4C according to the embodiment, as seen from the rear. Fig.13 2 is a perspective view showing a portion of the left housing 2L according to the embodiment. Fig.13 As shown, the inner surface of the housing 2 has a recessed portion 2A for arranging the wire 51. The recessed portion 2A is provided in the left housing 2L. At least a portion of the passage LP is constituted by the recessed portion 2A. The recessed portion 2A is a region formed by making the inner surface of the left housing 2L concave. The recessed portion 2A extends from the upper portion to the lower portion of the motor accommodating portion 21 of the left housing 2L in the up-down direction along the inner surface of the left housing 2L. The width of the recessed portion 2A in the front-to-back direction is set corresponding to the line width of the wire 51, and a portion of the wire 51 is arranged in the recessed portion 2A. A plurality of guide protrusions 2B are formed at the rear edge of the recessed portion 2A. A support wall 2C for supporting the left side surface of the motor bracket 4C is formed at the front edge of the recessed portion 2A. A plurality of guide protrusions 2B stand up from the inner surface of the left housing 2L. A plurality of guide protrusions 2B are arranged at intervals in the up-down direction along the recessed portion 2A. Four guide protrusions 2B are provided. The support wall 2C stands from the inner surface of the left case 2L. The end of the support wall 2C corresponds to the shape of the left side surface of the motor bracket 4C due to the relationship between the concave and convex shapes, and the left side surface of the motor bracket 4C is embedded in the end of the support wall 2C.

[0163] like Fig.12 As shown in FIG. 1 , the motor bracket 4C is a plate member in the shape of an annular ring. A bearing 64 is mounted in a central opening 91 of the motor bracket 4C. A mounting portion 92 having screw insertion holes is provided at four corners of the outer periphery of the motor bracket 4C. The motor bracket 4C is mounted by screws 4E (see FIG. 1 ) passing through the screw insertion holes of the mounting portion 92. Figure 4) is fixed to the fixing portion 4M at the rear end of the first housing 4A (see Figure 5 ). The motor bracket 4C functions as a pressure plate on the rear side of the reduction mechanism 30 in the first housing 4A. The motor bracket 4C functions as a positioning member for positioning 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 inner side of the bearing 64 with the position of the central axis of the reduction mechanism 30. A rod support portion 93 is provided at the upper end portion of the motor bracket 4C. The rod support portion 93 has a recessed portion into which the rear end portion of the guide rod 600 is inserted.

[0164] In the embodiment, the motor bracket 4C functions as a pressing member for pressing the lead wire 51. The motor bracket 4C contacts the lead wire 51 at a portion of the outer peripheral surface. The motor bracket 4C has a convex portion (94, 95) protruding toward the concave portion 2A on the outer periphery of the motor bracket 4C. The convex portion (94, 95) is provided on the outer periphery of the left side of the motor bracket 4C and faces the left housing 2L. The convex portion includes a first convex portion 94 and a second convex portion 95 along the circumferential direction of the motor bracket 4C. In the embodiment, one first convex portion 94 and two second convex portions 95 are formed.

[0165] The first protrusion 94 is arranged on the side of the motor bracket 4C. The first protrusion 94 is arranged on the left side of the motor bracket 4C at approximately the center of the motor bracket 4C in the up-down direction. The first protrusion 94 is located on the left side relative to the rotation axis (rotor shaft 63) of the motor 6 located at the center of the motor bracket 4C. The second protrusion 95 is arranged above or below the motor bracket 4C than the first protrusion 94. The second protrusion 95 is provided on the periphery of the motor bracket 4C at a position above the first protrusion 94 and a position below the first protrusion 94. The first protrusion 94 and the second protrusion 95 are both provided on the periphery of the rear surface of the motor bracket 4C, and protrude toward the rear side of the motor bracket 4C. As Fig.11 As shown, when the motor bracket 4C is mounted on the support wall 2C of the left housing 2L, the front-rear direction positions of the first convex portion 94 and the second convex portion 95 coincide with the formation position of the concave portion 2A. The first convex portion 94 and the second convex portion 95 both protrude radially outward from the outer peripheral portion of the rear side surface of the motor bracket 4C. Therefore, the first convex portion 94 and the second convex portion 95 protrude toward the concave portion 2A. The first convex portion 94 and the second convex portion 95 are opposite to the concave portion 2A in the radial direction of the motor bracket 4C.

[0166] Fig.14 FIG. 2 is a cross-sectional view showing the path LP of the conductor wire 51 according to the embodiment, viewed from the rear to the front. Fig.14 As shown, in the radial direction relative to the rotating shaft (rotor shaft 63) of the motor 6, the distance L1 from the rotating shaft to the end of the first protrusion 94 is smaller than the distances L2 and L3 from the rotating shaft to the end of the second protrusion 95. Fig.12 As shown, the first convex portion 94 and the second convex portion 95 protrude radially outward from the outer peripheral portion of the motor bracket 4C, and the protrusion amount of the first convex portion 94 is smaller than the protrusion amount of the second convex portion 95. Therefore, the distance L1 is smaller than the distances L2 and L3. At the formation position of the first convex portion 94, the position of the inner surface of the left housing 2L (the inner bottom surface of the concave portion 2A) is brought closer to the first convex portion 94 according to the amount of reduction in the distance L1. As a result, the position of the outer surface of the left housing 2L can be brought closer to the radial center side, so that the width dimension of the housing 2 of the motor housing portion 21 can be suppressed.

[0167] The wire 51 is configured to be embedded in the concave portion 2A, and on this basis, is pressed from the right side by the convex portions (the first convex portion 94 and the second convex portion 95) of the motor bracket 4C. Therefore, the wire 51 is sandwiched between the housing 2 and the motor bracket 4C. In other words, the wire 51 is held by the housing 2 from the outside. The wire 51 is held by the motor bracket 4C from the inside. The inner surface (concave portion 2A) of the left housing 2L contacts the wire 51 from the left side, and the convex portions (the first convex portion 94 and the second convex portion 95) contact the wire 51 from the right side. Therefore, the radial displacement (floating) of the wire 51 relative to the inner surface of the left housing 2L can be suppressed. In addition, the wire 51 is sandwiched between the plurality of guide protrusions 2B and the support wall 2C of the left housing 2L in the front-to-back direction. The plurality of guide protrusions 2B contact the wire 51 from the rear side, and the support wall 2C contacts the wire 51 from the front side. Therefore, the front-to-back displacement of the wire 51 on the inner surface of the left housing 2L can be suppressed.

[0168] [handle]

[0169] Fig.15 1 is a perspective view showing the driver drill 1 in a state where the handle 100 according to the embodiment is attached, as seen from the front. Fig.16 It is a perspective explanatory diagram showing the mounting portion 110 of the handle 100 according to the embodiment. Fig.17 This is a cross-sectional view from the rear to the front for explaining engagement between the handle 100 and the mounting portion 110 according to the embodiment.

[0170] like Fig.15 , Fig.16 and Fig.17 As shown, the driver drill 1 can be detached from the handle 100. The operator holds the grip portion 22 with one hand and the handle 100 with the other hand, thereby being able to stably and firmly hold the driver drill 1 during operation. The handle 100 can be mounted on the housing 2 or the shell 4. In the embodiment, the handle 100 can be detached from the second shell 4B in the shell 4. The second shell 4B has an assembly portion 110 for assembling the handle 100.

[0171] The handle 100 has a handle grip 101, an arm 102, and a strap 103. The arm 102 is mounted at the end of the handle grip 101. The arm 102 is a hollow cylindrical component made of metal. The assembly portion 110 has a circular cross-section when viewed from the front-to-back direction. The terminal portion 102A of the arm 102 is formed into a concave shape along the outer periphery of the assembly portion 110 (second housing 4B) and is formed into an arc shape. The terminal portion 102A of the arm 102 is open. The strap 103 is a belt-shaped component with a relatively large width. Both ends of the strap 103 are inserted into the opening of the terminal portion 102A of the arm 102, and are connected to the handle grip 101 inside the arm 102. Thus, the strap 103 is set in a ring shape. The handle grip 101 can rotate around the long axis (central axis) relative to the arm 102. When the handle 101 is twisted to rotate to one side, the handle 101 pulls the band 103 into the arm 102 by the rotation, and the ring diameter of the band 103 is reduced. When the handle 101 is twisted to rotate to the other side, the handle 101 pulls the band 103 out of the arm 102 by the rotation, and the ring diameter of the band 103 is expanded. In the state where the ring diameter is expanded, the fitting part 110 of the second housing 4B can be arranged inside the ring of the band 103. In the state where the fitting part 110 is arranged inside the ring of the band 103, the band 103 stretches and tightens the fitting part 110 toward the terminal part 102A of the arm 102 by reducing the ring diameter. The arm 102 is fixed to the fitting part 110 by tightening the band 103.

[0172] The assembly portion 110 of the second housing 4B can be engaged with the terminal portion 102A of the arm 102. By engaging, the arm 102 can be prevented from being displaced in the circumferential direction of the assembly portion 110. A plurality of engaging recesses 111 are formed in the assembly portion 110. The engaging recesses 111 are formed at equal angle intervals around the entire circumference of the assembly portion 110. The engaging recesses 111 are arranged in two rows at the front end of the assembly portion 110 and the rear end of the assembly portion 110. In addition, flanges 112 that stand out radially outward are respectively formed on both outer sides of the two rows of engaging recesses 111. In other words, the assembly portion 110 is formed so that the outer diameter between the pair of flanges 112 is smaller than the flange 112. The terminal portion 102A of the arm 102 is mounted between the pair of flanges 112. The displacement of the arm 102 in the front-rear direction is prevented by the engaging recesses 111 and the pair of flanges 112.

[0173] The end portion 102A of the arm 102 is provided with an engaging protrusion 104 that engages with the engaging recess 111. The engaging protrusion 104 is formed in two rows in the front-to-back direction corresponding to the engaging recess 111 in the front and rear rows. The two rows of engaging protrusions 104 are formed at the ends of the front wall 102B and the rear wall 102B that define the opening of the arm 102. A plurality of engaging protrusions 104 are formed in each row along the circumferential direction of the end portion 102A. A plurality of engaging protrusions 104 are formed from one end to the other end of the end portion 102A of the arm 102. The plurality of engaging protrusions 104 are respectively engaged with a plurality of engaging recesses 111 in one row arranged in the circumferential direction of the assembly portion 110. The two rows of engaging protrusions 104 are embedded in the two rows of engaging recesses 111 so that the arm 102 is engaged with the assembly portion 110.

[0174] like Fig.17 As shown, the engaging recesses 111 are arranged at equal angular intervals of a predetermined angle θ on the entire circumference of the assembly portion 110. In the embodiment, the angle θ is 15 degrees. 24 engaging recesses 111 are formed at intervals of 15 degrees on the entire circumference of the assembly portion 110. The engaging protrusions 104 of the distal end 102A of the arm 102 are formed at equal angular intervals of the angle θ in the same manner as the engaging recesses 111. In the embodiment, regarding the columns of the engaging protrusions 104, each column is composed of 8 engaging protrusions 104. The arm 102 is engaged with the assembly portion 110 using the engaging protrusions 104 and the engaging recesses 111 at 8×2 columns, a total of 16 locations. The handle 100 can be mounted relative to the assembly portion 110 in any direction with the angle θ as a unit.

[0175] When assembling the handle 100, the operator places the assembly portion 110 of the second housing 4B inside the ring of the band 103 while expanding the ring diameter of the band 103. The operator brings the terminal end 102A of the arm 102 into contact with the assembly portion 110 so that each engaging protrusion 104 engages with the engaging recess 111. The operator twists the handle grip 101 to one side to reduce the ring diameter of the band 103. The state in which the terminal end 102A of the arm 102 is pressed against the assembly portion 110 is maintained by the tightening force of the band 103. Thus, the handle 100 is mounted on the assembly portion 110. When removing the handle 100 or changing the mounting position, the state in which the terminal end 102A of the arm 102 is pressed against the assembly portion 110 can be released by twisting the handle grip 101 to the other side to expand the ring diameter of the band 103.

[0176] [Effect]

[0177] As described above, in the embodiment, the driver drill 1 may include: a motor 6; an output portion 8, which is provided in front of the motor 6 and driven by the motor 6; a speed reduction mechanism 30, which is arranged between the motor 6 and the output portion 8; a motor bracket 4C, which is arranged between the motor 6 and the speed reduction mechanism 30; a housing 2, which accommodates the motor 6 and the motor bracket 4C; an element 50, which is provided above the motor 6 or the speed reduction mechanism 30; and a lead 51, which is connected to the element 50 and extends to a position below the motor 6 or the speed reduction mechanism 30. The lead 51 may be sandwiched between the housing 2 and the motor bracket 4C.

[0178] According to the above configuration, it is possible to appropriately hold the lead wire 51 connected to the element 50 while suppressing an increase in the outer dimensions.

[0179] In the embodiment, the driver drill 1 may have a concave portion 2A on the inner surface of the housing 2 in which the guide wire 51 is disposed.

[0180] According to the above configuration, positional displacement of the lead wire 51 can be effectively suppressed.

[0181] In the embodiment, the driver drill 1 may include convex portions ( 94 , 95 ) on the outer periphery of the motor bracket 4C, which protrude toward the concave portion 2A.

[0182] According to the above configuration, it is possible to more effectively suppress the positional displacement of the lead wire 51 between the concave portion 2A and the convex portion ( 94 , 95 ).

[0183] In an embodiment, the protrusion may include a first protrusion 94 and a second protrusion 95 along the circumference of the motor bracket 4C. In the radial direction relative to the rotation axis (rotor shaft 63) of the motor 6, the distance from the rotation axis to the end of the first protrusion 94 may be smaller than the distance from the rotation axis to the end of the second protrusion 95.

[0184] According to the above configuration, even when the convex portion is provided, the outer shape of the housing 2 is unlikely to increase at the position where the first convex portion 94 is formed, so that the driver drill 1 can be prevented from increasing in size.

[0185] In the embodiment, the first protrusion 94 may be disposed on the side surface of the motor bracket 4C. The second protrusion 95 may be disposed above or below the motor bracket 4C relative to the first protrusion 94 .

[0186] According to the above configuration, the width dimension of the driver drill 1 can be suppressed.

[0187] In the embodiment, the driver drill 1 may further include a vibration mechanism 40 that vibrates the output portion 8 .

[0188] According to the above configuration, drilling processing using vibration can be performed. Even in the case of vibration, displacement of the lead wire 51 due to the vibration can be effectively suppressed.

[0189] In the embodiment, the speed reduction mechanism 30 may be multi-speed variable. The driver drill 1 may further include a speed switching lever 12 disposed on the upper portion of the housing 2 and switching the speed reduction ratio of the speed reduction mechanism 30. The element 50 may include a sensor for detecting the switching of the speed reduction ratio by the speed switching lever 12.

[0190] According to the above configuration, the lead wire 51 connected to the sensor in the upper portion of the housing 2 can be appropriately held.

[0191] In the embodiment, the driver drill 1 as a vibration driver drill may include: a motor 6; an output unit 8, which is provided in front of the motor 6 and driven by the motor 6; a speed reduction mechanism 30, which is arranged between the motor 6 and the output unit 8; a vibration mechanism 40, which is arranged between the speed reduction mechanism 30 and the output unit 8; a motor bracket 4C, which is arranged between the motor 6 and the speed reduction mechanism 30; a housing 2, which accommodates the motor 6 and the motor bracket 4C; an element 50, which is provided above the motor 6 or the speed reduction mechanism 30; and a wire 51, which is connected to the element 50 and extends to a position below the motor 6. The wire 51 may be held by the motor bracket 4C.

[0192] According to the above configuration, it is possible to appropriately hold the lead wire 51 connected to the element 50 while suppressing an increase in the outer dimensions. Even in the case of vibration, it is possible to effectively suppress displacement of the lead wire 51 due to the vibration.

[0193] In the embodiment, the driver drill 1 as a vibration driver drill may include: a motor 6; an output unit 8, which is provided in front of the motor 6 and driven by the motor 6; a speed reduction mechanism 30, which is arranged between the motor 6 and the output unit 8; a vibration mechanism 40, which is arranged between the output unit 8 and the speed reduction mechanism 30; a housing 2, which accommodates the motor 6 and the speed reduction mechanism 30; an element 50, which is provided above the motor 6 and the speed reduction mechanism 30; and a controller 17, which is provided below the motor 6 and connected to the element 50 via a wire 51. A passage LP through which the wire 51 passes may be provided between the motor 6 and the speed reduction mechanism 30 in the front-rear direction.

[0194] According to the above configuration, it is possible to appropriately hold the lead wire 51 connected to the element 50 while suppressing an increase in the outer dimensions. Even in the case of vibration, it is possible to effectively suppress displacement of the lead wire 51 due to the vibration.

[0195] In the embodiment, the driver drill 1 as a vibration driver drill may further include a motor bracket 4C disposed between the motor 6 and the speed reduction mechanism 30 and positioning the motor 6 and the speed reduction mechanism 30. The passage LP may be provided between the motor bracket 4C and the housing 2 surrounding the outer periphery of the motor bracket 4C.

[0196] According to the above configuration, the path LP of the conductive wire 51 can be constructed without increasing the number of components.

[0197] [Other embodiments]

[0198] In the above embodiment, the battery pack 20 mounted on the battery mounting portion 5 is used as the power source of the driver drill 1. As the power source of the driver drill 1, a commercial power source (AC power source) may be used.

[0199] In the above embodiment, the element 50 connected to the lead wire 51 includes a sensor that detects the switching of the speed reduction ratio by the speed switching lever 12. The element 50 connected to the lead wire 51 may be a component other than the sensor that detects the switching of the speed reduction ratio by the speed switching lever 12.

[0200] Fig.18 and Fig.19 Schematic diagram showing an element 50 according to another embodiment. Fig.18 , Fig.19 In FIG. 1 , the outer shape of the driver drill 1 (housing 2) is shown by dotted lines, and the motor 6, the motor bracket 4C, the speed reduction mechanism 30, the speed switching lever 12, and the element 50 are shown by solid lines. The lead wire 51 is shown by two-dot chain lines.

[0201] exist Fig.18 In the embodiment, the element 50 includes a notification light for notifying the driving state of the motor 6. The element 50 includes a light-emitting portion 151 and a circuit board 152. The light-emitting portion 151 is composed of, for example, an LED (light-emitting diode) element. The light-emitting portion 151 emits light due to the supply of power via the wire 51. The light-emitting portion 151 is exposed from the upper part of the housing 2 and can be visually confirmed, or can be visually confirmed via a translucent window component provided on the upper part of the housing 2. The element 50 can have a plurality of light-emitting portions 151. The controller 17, for example, turns on the notification light during the rotation of the motor 6. The controller 17, for example, makes the lighting state of the notification light different when the motor 6 rotates to one side and when it rotates to the other side. Making the lighting state different, for example, means making the light color, lighting (flashing) interval, and the light-emitting portion 151 different. For example, if the current value of the motor 6 exceeds a threshold value, the controller 17 turns on the notification light.

[0202] The element 50 is disposed above the motor 6. In this case, the lead wire 51 also passes through the passage LP (see FIG. 1 ) between the motor 6 and the speed reduction mechanism 30 in the front-rear direction. Fig.11 ) and connected to the element 50. The lead wire 51 is sandwiched between the housing 2 and the motor bracket 4C and is held by the motor bracket 4C.

[0203] As described above, in the embodiment, the element 50 includes the notification lamp for notifying the driving state of the motor 6. According to the above configuration, the lead wire 51 connected to the notification lamp can be appropriately held.

[0204] exist Fig.19 , the component 50 includes an operation switch for accepting operation input. The component 50 includes an input unit 153 and a circuit substrate 154. The input unit 153 is composed of an input device for accepting operation input. The input device may be a push button switch, other mechanical switches, a touch sensor, a non-contact proximity sensor, etc. The input unit 153 outputs a signal corresponding to the operation input to the controller 17 via a wire 51. The input unit 153 is exposed from the upper part of the housing 2 and can be operated, or can be operated with the help of a window member provided on the upper part of the housing 2. The component 50 may have a plurality of input units 153. The controller 17 accepts the operation of changing the mode of the screwdriver drill 1, for example, with the help of an operation switch. The controller 17 switches the operation mode of the motor 6, for example, in response to the operation input. The controller 17 changes the maximum torque value of the motor 6 in response to the switching of the operation mode. The controller 17 changes the maximum speed of the motor 6 in response to the switching of the operation mode. The operating device 24 and the display device 25 such as the interface panel 15 of the embodiment may be set as Fig.19 Component 50.

[0205] The element 50 is disposed above the motor 6. In this case, the lead wire 51 also passes through the passage LP (see FIG. 1 ) between the motor 6 and the speed reduction mechanism 30 in the front-rear direction. Fig.11 ) and connected to the element 50. The lead wire 51 is sandwiched between the housing 2 and the motor bracket 4C and is held by the motor bracket 4C.

[0206] In the embodiment, the element 50 may include an operation switch for receiving an operation input. According to the above configuration, the lead wire 51 connected to the operation switch can be appropriately held.

[0207] In the above embodiment, the lead wire 51 is sandwiched between the motor bracket 4C and the case 2 (left case 2L). The lead wire 51 may not be sandwiched between the motor bracket 4C and the case 2 (left case 2L).

[0208] Fig. 20 2 is a perspective view showing a motor bracket according to another embodiment. Fig. 20 In FIG. 5 , the conductor 51 is shown by a double-dashed line. Fig. 20 In the embodiment, a passage LP is provided in the motor bracket 4C. The motor bracket 4C has a cylindrical portion 191 on the left peripheral portion through which the lead wire 51 passes. Both ends of the cylindrical portion 191 are open, and have an internal space that penetrates along the circumferential direction of the motor bracket 4C. The cylindrical portion 191 is respectively arranged Fig.12The first protrusion 94 and the two second protrusions 95 shown in FIG. 1 correspond to three locations. The three cylindrical portions 191 respectively constitute a passage LP through which the conductor 51 passes. Fig. 20 In the embodiment, the lead wire 51 is held by the motor bracket 4C.

[0209] Fig.21 FIG. 2 is a left side view showing a motor bracket according to another embodiment. Fig.21 In FIG. 5 , the conductor 51 is shown by a double-dashed line. Fig.21 In the motor bracket 4C, a passage LP is provided. The motor bracket 4C has a passage LP formed by a pair of wall portions 192A and 192B on the outer periphery of the left side. The pair of wall portions 192A and 192B protrude radially outward from the outer periphery of the motor bracket 4C. The pair of wall portions 192A and 192B are opposed to each other with a gap in the front-rear direction. The passage LP is formed by the gap between the pair of wall portions 192A and 192B. The size of the gap between the pair of wall portions 192A and 192B (i.e., the width of the passage LP) is set to a width suitable for holding the wire 51. A convex wall protruding toward the wall portion 192B is formed on the wall portion 192A and at the middle position of the passage LP. The wall portion 192B has a concave portion that is concave in a direction (rearward) away from the wall portion 192A at least at the formation position of the convex wall. The passage LP has a curved shape due to the convex wall of the wall portion 192A and the concave portion of the wall portion 192B. The wire 51 is inserted into the curved passage LP. The wire 51 is bent in the passage LP, so that the friction resistance between the wire 51 and the wall portions 192A and 192B increases. As a result, the wire 51 is fixed in the passage LP. The pair of wall portions 192A and 192B protrude radially outward, so 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), thereby preventing the wire 51 from falling out of the passage LP. The pair of wall portions 192A and 192B are respectively arranged with Fig.12 The first protrusion 94 and the two second protrusions 95 shown correspond to three locations. Fig. 20 In the embodiment, the lead wire 51 is held by the motor bracket 4C.

[0210] In addition, in the above-mentioned embodiments and Fig. 20 , Fig.21 In each of the modified examples, the lead wire 51 is passed between the left side surface of the motor bracket 4C and the left case 2L. The lead wire 51 may be passed between the right side surface of the motor bracket 4C and the right case 2R.

[0211] In addition, in the above-mentioned embodiment, the passage LP between the motor 6 and the speed reduction mechanism 30 is provided between the motor bracket 4C and the housing 2. The passage LP between the motor 6 and the speed reduction mechanism 30 may also be provided in a component other than the motor bracket 4C. For example, a component for forming the passage LP through which the lead wire 51 passes may be added between the motor 6 and the motor bracket 4C.

Claims

1. A driver drill, the driver drill comprising: motor; an output unit, which is arranged in front of the motor and driven by the motor; a speed reduction mechanism disposed between the motor and the output portion; a motor bracket, disposed between the motor and the speed reduction mechanism; a housing for housing the motor and the motor bracket; An element disposed above the motor or the speed reduction mechanism; as well as a wire connected to the element and extending to a position below the motor or the speed reduction mechanism, The wire is sandwiched between the housing and the motor bracket.

2. The driver drill according to claim 1, characterized in that: The inner surface of the housing has a concave portion in which the lead wire is arranged.

3. The driver drill according to claim 2, characterized in that: The motor bracket has a convex portion on an outer periphery thereof and protrudes toward the concave portion.

4. The driver drill according to claim 3, characterized in that: The protrusion includes a first protrusion and a second protrusion along the circumferential direction of the motor bracket. In a radial direction relative to a rotation axis of the motor, a distance from the rotation axis to a distal end of the first protrusion is smaller than a distance from the rotation axis to a distal end of the second protrusion.

5. The driver drill according to claim 4, characterized in that: The first protrusion is arranged on a side surface of the motor bracket, The second protrusion is arranged above or below the motor bracket relative to the first protrusion.

6. The driver drill according to any one of claims 1 to 4, characterized in that: The driver drill further includes a vibration mechanism that vibrates the output portion.

7. The driver drill according to any one of claims 1 to 4, characterized in that: The deceleration mechanism is a multi-stage speed change. The driver drill further includes a speed switching lever disposed on an upper portion of the housing and configured to switch a reduction ratio of the reduction mechanism. The element includes a sensor that detects switching of the speed reduction ratio by the speed switching lever.

8. The driver drill according to any one of claims 1 to 4, characterized in that: The elements include a notification lamp that notifies a driving state of the motor.

9. The driver drill according to any one of claims 1 to 4, characterized in that: The elements include an operation switch that receives an operation input.

10. A vibrating driver drill, comprising: motor; an output unit, which is arranged in front of the motor and driven by the motor; a speed reduction mechanism disposed between the motor and the output portion; a vibration mechanism disposed between the speed reduction mechanism and the output portion; a motor bracket, disposed between the motor and the speed reduction mechanism; a housing for housing the motor and the motor bracket; An element disposed above the motor or the speed reduction mechanism; as well as a lead wire connected to the element and extending to a position below the motor, The lead wire is held by the motor bracket.

11. A vibrating driver drill, comprising: motor; an output unit, which is arranged in front of the motor and driven by the motor; a speed reduction mechanism disposed between the motor and the output portion; a vibration mechanism disposed between the output portion and the speed reduction mechanism; A housing for housing the motor and the speed reduction mechanism; An element disposed above the motor and the speed reduction mechanism; as well as a controller, which is arranged below the motor and connected to the element via a wire, A passage through which the lead wire passes is provided between the motor and the speed reduction mechanism in the front-rear direction.

12. The vibration driver drill according to claim 11, characterized in that: The vibration driver drill further includes a motor bracket disposed between the motor and the speed reduction mechanism and positioning the motor and the speed reduction mechanism. The passage is provided between the motor bracket and the housing surrounding the outer periphery of the motor bracket.

Images