DRILLS AND IMPACT DRILLS

Abstract

A drill driver may comprise a motor, an output part located at the front of the motor and driven by the motor, a speed reduction mechanism situated between the motor and the output part, a motor mount situated between the motor and the speed reduction mechanism, a housing that accommodates the motor and the motor mount, an element positioned above the motor or the speed reduction mechanism, and a connecting wire connected to the connecting wire and extending downwards beyond the motor or the speed reduction mechanism. The connecting wire may be sandwiched between the housing and the motor mount.

Description

BACKGROUND

[0001] The technology disclosed in the present specification relates to a drill driver and an impact drill driver.

[0002] In the technical field relating to a drill driver, a drill driver is known which is disclosed in JP 2021 - 171 857 A. SHORT SUMMARY

[0003] A non-limiting object of the present teachings is to disclose techniques for properly holding a lead wire connected to an element while preventing an increase in an external dimension.

[0004] The above-mentioned object is achieved by a drill driver according to claim 1, an impact drill driver according to claim 10 or an impact drill driver according to claim 11.

[0005] According to one aspect of the present teachings, a drill driver may include a motor, an output part provided at the front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output part, a motor mount disposed between the motor and the speed reduction mechanism, a housing that houses the motor and the motor mount, a member provided above the motor or the speed reduction mechanism, and a lead wire connected to the member and extending further downward than the motor or the speed reduction mechanism. The lead wire may be sandwiched between the housing and the motor mount.

[0006] According to another aspect of the present teachings, an impact drill may include a motor, an output portion provided at the front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output portion, a hammer mechanism disposed between the speed reduction mechanism and the output portion, a motor mount disposed between the motor and the speed reduction mechanism, a housing accommodating the motor and the motor mount, a member provided above the motor or the speed reduction mechanism, and a lead wire connected to the member and extending downwards farther than the motor. The lead wire may be held by the motor mount.

[0007] According to yet another aspect of the present teachings, an impact drill may include a motor, an output part provided at the front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output part, a hammer mechanism disposed between the output part and the speed reduction mechanism, a housing that houses the motor and the speed reduction mechanism, a member provided above the motor and the speed reduction mechanism, and a controller provided below the motor and connected to the member via a lead wire. A passage through which the lead wire passes may be provided between the motor and the speed reduction mechanism in a front-to-back direction.

[0008] Additional aspects, objects, embodiments, and advantages of the present teachings will become apparent upon reading the present detailed description in conjunction with the accompanying drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front perspective view illustrating a drill driver according to an embodiment; Fig. 2 is a rear perspective view illustrating the drill driver according to the embodiment. Fig. 3 is a cross-sectional view illustrating the drill driver according to the embodiment; Fig. 4 is a cross-sectional view showing a part of the drill driver according to the embodiment. Fig. 5 is an exploded rear perspective view illustrating a motor, a motor mount, and a speed reduction mechanism according to the embodiment. Fig. 6 is a rear perspective view showing a part of the speed reduction mechanism according to the embodiment. Fig. 7 is an exploded rear perspective view illustrating the speed reduction mechanism according to the embodiment; Fig. 8 is an exploded front perspective view illustrating the speed reduction mechanism according to the embodiment; Fig. 9 is a top cross-sectional view illustrating a moving structure of a speed change lever of the embodiment; Fig. 10 is a cross-sectional view illustrating a hammer mechanism according to the embodiment; Fig. 11 is a rear perspective view illustrating a left case and the motor mount according to the embodiment; Fig. 12 is a rear perspective view illustrating the engine mount according to the embodiment; Fig. 13 is a rear perspective view showing a part of the left case according to the embodiment; Fig. 14 is a back-to-front cross-sectional arrow view illustrating a passage of a lead wire according to the embodiment; Fig. 15 is a front perspective view illustrating a drill driver with a handle attached thereto according to the embodiment; Fig. 16 is a perspective view illustrating an attachment part of the handle according to the embodiment; Fig. 17 is a back-to-front cross-sectional arrow view illustrating engagement between the handle and the attachment part according to the embodiment; Fig. 18 is a schematic drawing illustrating an element according to another embodiment; Fig. 19 is a schematic drawing illustrating the element according to the further embodiment; Fig. 20 is a perspective view illustrating an engine mount according to another embodiment; and Fig. 21 is a left side view illustrating an engine mount according to another embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0009] In one or more embodiments, the drill driver may include a motor, an output part provided at the front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output part, a motor mount disposed between the motor and the speed reduction mechanism, a housing that houses the motor and the motor mount, a member provided above the motor or the speed reduction mechanism, and a lead wire connected to the member and extending further downward than the motor or the speed reduction mechanism. The lead wire may be sandwiched between the housing and the motor mount.

[0010] With the configuration described above, the lead wire connected to the element is properly held while preventing an increase in the outer dimension.

[0011] In one or more embodiments, the drill driver may have a recess on an inner surface of the housing in which lead wires are arranged.

[0012] With the configuration described above, the positional displacement of the lead wire is effectively prevented.

[0013] In one or more embodiments, the drill driver may include a projection projecting toward the recess on the outer periphery of the motor mount.

[0014] With the configuration described above, the positional displacement of the lead wire is more effectively prevented between the recess and the projection.

[0015] In one or more embodiments, the protrusion may include a first protrusion and a second protrusion in the circumferential direction of the motor mount. In the radial direction of the rotational axis of the motor, the distance from the rotational axis to the front end of the first protrusion may be shorter than a distance from the rotational axis to the front end of the second protrusion.

[0016] With the configuration described above, even with the protrusion, the outer shape of the housing is less likely to be enlarged at the formation position of the first protrusion, which can prevent the drill driver from being enlarged.

[0017] In one or more embodiments, the first protrusion may be disposed on a side surface of the engine mount. The second protrusion may be disposed further up or down on the engine mount than the first protrusion.

[0018] With the configuration described above, the width dimension of the drill driver is reduced.

[0019] In one or more embodiments, the drill driver may further include a hammer mechanism that hammers the output portion.

[0020] With the configuration described above, drilling can be performed using hammers. Even with hammers, positional displacement of the conductor wire due to hammering can be effectively prevented.

[0021] In one or more embodiments, the speed reduction mechanism may be a multi-stage speed change mechanism. The drill driver may further include a speed switching lever disposed at an upper portion of the housing for switching a speed reduction ratio of the speed reduction mechanism. The element may include a sensor that detects the switching of the speed reduction ratio performed by the speed switching lever.

[0022] With the configuration described above, the lead wire connected to the sensor at the top of the housing is held appropriately.

[0023] In one or more embodiments, the element may include an indicator light that indicates a drive state of the motor.

[0024] With the configuration described above, the lead wire connected to the indicator light is kept appropriate.

[0025] In one or more embodiments, the element may include an actuation switch that receives an actuation input.

[0026] With the configuration described above, the lead wire connected to the actuating switch is kept appropriate.

[0027] In one or more embodiments, the impact drill may include a motor, an output portion provided at the front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output portion, a hammer mechanism disposed between the speed reduction mechanism and the output portion, a motor mount disposed between the motor and the speed reduction mechanism, a housing accommodating the motor and the motor mount, a member provided above the motor or the speed reduction mechanism, and a lead wire connected to the member and extending further downward than the motor. The lead wire may be held by the motor mount.

[0028] With the configuration described above, the lead wire connected to the element is properly held while preventing an increase in its outer dimension. Even in the case of hammering, positional displacement of the lead wire due to hammering is effectively prevented.

[0029] In one or more embodiments, an impact drill may include a motor, an output part provided at the front of the motor and driven by the motor, a speed reduction mechanism disposed between the motor and the output part, a hammer mechanism disposed between the output part and the speed reduction mechanism, a housing that houses the motor and the speed reduction mechanism, a member provided above the motor and the speed reduction mechanism, and a controller provided below the motor and connected to the member via a lead wire. A passage through which the lead wire passes may be provided between the motor and the speed reduction mechanism in a front-to-back direction.

[0030] With the configuration described above, the lead wire connected to the element is properly held while preventing an increase in its outer dimension. Even in the case of hammering, positional displacement of the lead wire due to hammering is effectively prevented.

[0031] In one or more embodiments, the impact drill may further include a motor mount disposed between the motor and the speed reduction mechanism for positioning the motor and the speed reduction mechanism. The passage may be provided between the motor mount and the housing surrounding the outer periphery of the motor mount.

[0032] With the configuration described above, the passage of the lead wire is constructed without increasing the number of components.

[0033] Embodiments according to the present disclosure will be described below with reference to the drawings, although the present disclosure is not limited to them. The components of the embodiments described below can be combined as appropriate. Furthermore, there may be cases where some components are not used.

[0034] In the embodiment, the positional relationship of each component is described using the terms "left," "right," "front," "back," "top," and "bottom." These terms indicate the relative position or direction with respect to the center of the drill / driver.

[0035] The drill driver includes a motor. In the embodiment, a direction parallel to a rotation axis AX is referred to as an axial direction, a direction around the rotation axis AX is referred to as a circumferential direction or a rotation direction, and a beam direction of the rotation axis AX is referred to as a radial direction.

[0036] In the embodiment, the rotation axis AX extends in the front-to-back direction. The axial direction and the front-to-back direction coincide. One side in the axial direction is forward, and the other side in the axial direction is rearward. In the radial direction, a position close to or a direction approaching the rotation axis AX is referred to as radially inward, and a position away from or a direction away from the rotation axis AX is referred to as radially outward. Overview of drill drivers

[0037] Fig. 1 is a front perspective view illustrating a drill driver 1 according to the embodiment. Fig. 2 is a rear perspective view illustrating the drill driver 1 according to the embodiment. Fig. Figure 3 is a cross-sectional view illustrating the drill driver according to the embodiment. In the embodiment, the drill driver 1 is an impact drill driver. Fig. 4 is a cross-sectional view showing a part of the drill driver 1 according to the embodiment.

[0038] As in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the drill driver 1 comprises a housing 2, a rear cover 3, a casing 4, a battery mounting part 5, a motor 6, a power transmission mechanism 7, an output part 8, a fan 9, a trigger lever 10, a forward-reverse switching lever 11, a speed switching lever 12, a mode switching ring 13, an interface panel 15, a rotary dial 16, and a controller 17.

[0039] The housing 2 is made of a synthetic resin. In the present 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 secured by screws 2S. The left housing 2L and the right housing 2R, which are secured together, form the housing 2.

[0040] The housing 2 has a motor housing part 21, a handle part 22 and a battery holding part 23.

[0041] The motor housing part 21 accommodates the motor 6. The motor housing part 21 has a tubular shape. The motor housing part 21 is arranged such that it covers the circumference of the motor 6.

[0042] The handle portion 22 is configured to be gripped by a user. The handle portion 22 is arranged below the motor housing portion 21. The handle portion 22 extends downward from the motor housing portion 21. The trigger lever 10 is arranged at a front region of the handle portion 22.

[0043] The battery holding part 23 accommodates the controller 17. The battery holding part 23 is arranged at a lower position of the handle part 22. The battery holding part 23 is connected to a lower end portion of the handle part 22. In both the front-to-back direction and the left-to-right direction, the outer shape dimension of the battery holding part 23 is larger than the outer shape dimension of the handle part 22.

[0044] The rear cover 3 is made of a synthetic resin. The rear cover 3 is arranged at the rear of the motor housing part 21. The rear cover 3 is arranged to cover a rear portion of the motor 6. The rear cover 3 accommodates the fan 9. The rear cover 3 is arranged to cover an opening in a rear portion of the motor housing part 21. The rear cover 3 is fixed to the motor housing part 21 by screws 3S. The motor housing part 21 and the rear cover 3 are enclosure members that cover the periphery and a rear portion of the motor 6. The motor housing part 21 and the rear cover 3 can be integrated with each other.

[0045] The motor housing part 21 has air intake openings 18. The rear cover 3 has air discharge openings 19. Air in the exterior of the housing 2 flows into the interior of the housing 2 via the air intake openings 18. Air in the interior of the housing 2 flows out of the housing 2 to the exterior via the air discharge openings 19.

[0046] The case 4 houses the power transmission mechanism 7. The case 4 includes a first case 4A, a second case 4B, and a motor mount 4C. The second case 4B is arranged in front of the first case 4A. The mode switching ring 13 is arranged in front of the second case 4B. The first case 4A and the motor mount 4C are made of a synthetic resin. The second case 4B is made of a metal. In the embodiment, the second case 4B is made of aluminum or an aluminum alloy. The case 4 is connected to a front portion of the motor housing part 21. The first case 4A and the second case 4B each have a tubular shape.

[0047] The first case 4A is fixed to a rear end portion of the second case 4B. The motor mount 4C is arranged to cover an opening at a rear end portion of the first case 4A. The motor mount 4C is fixed to a rear end portion of the first case 4A by screws 4E. A stopper plate 4D is provided at a front end portion of the second case 4B. The stopper plate 4D is arranged to cover an opening in a front end portion of the second case 4B. The stopper plate 4D is fixed to the front end portion of the second case 4B by screws 4F.

[0048] The housing 4 is arranged such that it covers an opening in a front region of the motor housing part 21. The first housing 4A is arranged inside the motor housing part 21. The second housing 4B is fixed to the motor housing part 21 by screws 4S.

[0049] The battery mounting part 5 is formed at a lower portion of the battery holding part 23. The battery mounting part 5 is connectable to the battery pack 20. The battery pack 20 is mounted on the battery mounting part 5. The battery pack 20 is removable from the battery mounting part 5. The battery pack 20 includes a secondary battery. In embodiments, the battery pack 20 includes a rechargeable lithium-ion battery. The battery pack 20 can supply electric power to the drill driver 1 by being mounted on the battery mounting part 5. The motor 6 is driven using electric power supplied from the battery pack 20. The interface panel 15 and the controller 17 operate using electric power supplied from the battery pack 20.

[0050] The motor 6 is a power source of the drill driver 1. The motor 6 is an inner rotor type brushless motor. The motor 6 is housed in the motor housing part 21. The motor 6 includes a stator 61 having a tubular shape and a rotor 62 disposed inside the stator 61. The rotor 62 rotates relative to the stator 61. The rotor 62 includes a rotor shaft 63 extending in the axial direction.

[0051] The power transmission mechanism 7 is arranged in front of the motor 6. The power transmission mechanism 7 is housed in the housing 4. The power transmission mechanism 7 couples the rotor shaft 63 and the output part 8 to each other. The power transmission mechanism 7 transmits drive power generated by the motor 6 to the output part 8. The power transmission mechanism 7 has a plurality of gears.

[0052] The power transmission mechanism 7 includes a speed reduction mechanism 30 and a hammer mechanism 40.

[0053] The speed reduction mechanism 30 reduces the speed input from the rotor 62 (the rotor shaft 63) to rotate the output part 8 at a speed lower than the speed 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 arranged farther forward than the motor 6. The second planetary gear mechanism 32 is arranged farther forward than the first planetary gear mechanism 31. The third planetary gear mechanism 33 is arranged farther forward than the second planetary gear mechanism 32. The first planetary gear mechanism 31 is driven by the rotational force of the motor 6. The second planetary gear mechanism 32 is driven by the rotational force of the first planetary gear mechanism 31.The third planetary gear mechanism 33 is driven by the rotational force of the second planetary gear mechanism 32.

[0054] The hammer mechanism 40 causes the output part 8 to hammer in the axial direction. The hammer mechanism 40 includes a first cam 41, a second cam 42, and a hammer switching ring 43.

[0055] The output part 8 is arranged further forward than the motor 6. The output part 8 is rotated by the rotating force of the rotor 62. The output part 8 rotates with an attached bit in response to the application of the rotating force transmitted from the rotor 62 via the power transmission mechanism 7. The output part 8 has a spindle 81 that rotates about the rotation axis AX in response to the application of the rotating force transmitted from the rotor 62, and a drill chuck 82 mounted on a front end portion of the spindle 81. The bit is held in (by) the drill chuck 82. A front end portion of the drill chuck 82 is arranged further forward than the housing 4. At least a portion of the spindle 81 is arranged further forward than the third planetary gear mechanism 33. The spindle 81 is coupled to the third planetary gear mechanism 33.The spindle 81 is rotated by the rotational force of the rotor 62, which is transmitted via the first planetary gear mechanism 31, the second planetary gear mechanism 32 and the third planetary gear mechanism 33.

[0056] The fan impeller 9 is arranged at the rear of the motor 6. The fan impeller 9 generates an airflow for cooling the motor 6. The fan impeller 9 is fixed to the rotor 62. The fan impeller 9 is fixed to a rear portion of the rotor shaft 63. The fan impeller 9 is rotated by the rotation of the rotor shaft 63. When the rotor shaft 63 rotates, the fan impeller 9 rotates together with the rotor shaft 63. When the fan impeller 9 rotates, air outside the housing 2 flows into the interior of the housing 2 via the air intake openings 18. The air flowing into the interior of the housing 2 flows through the interior of the housing 2 to cool the motor 6. The air flowing through the interior of the housing 2 flows out to the exterior of the housing 2 via the air discharge openings 19.

[0057] The trigger lever 10 is operated to start the motor 6. The trigger lever 10 is provided at an upper portion of the handle 22. The front end portion of the trigger lever 10 protrudes forward from a front portion of the handle 22. The trigger lever 10 is movable in the front-back direction. The trigger lever 10 is operated by a user. By operating the trigger lever 10 to move backward, the motor 6 starts. By releasing the operation of the trigger lever 10, the motor 6 stops.

[0058] The forward-reverse switching lever 11 is operated (pressed, slid) to switch the rotation direction of the motor 6. The forward-reverse switching lever 11 is provided at an upper portion of the handle part 22. A left end portion of the forward-reverse switching lever 11 protrudes leftward from a left portion of the handle part 22. A right end portion of the forward-reverse switching lever 11 protrudes rightward from the right portion of the handle part 22. The forward-reverse switching lever 11 is movable in the left-right direction. The forward-reverse switching lever 11 is operated by a user. By operating the forward-reverse switching lever 11 to move leftward, the motor 6 rotates in the forward rotation direction. By moving the forward-reverse switching lever 11 to the right, the motor 6 rotates in the reverse direction. Switching the rotation direction of the motor 6 changes the rotation direction of the spindle 81.

[0059] The speed switching lever 12 is operated (slid) to change the speed mode (switching positions) of the speed reduction mechanism 30. The speed switching lever 12 is provided at an upper portion of the motor housing part 21. The speed switching lever 12 is movable in the front-to-back direction. The speed switching lever 12 is operated by a user. The speed modes (variable speed stages) of the speed reduction mechanism 30 include a low-speed mode (speed "1"), a medium-speed mode (speed "2"), and a high-speed mode (speed "3"). That is, the number of switching positions of the speed reduction mechanism 30 is three. The speed reduction mechanism 30 is a three-stage variable-speed speed reduction mechanism 30.

[0060] The low-speed mode refers to a speed mode in which the output part 8 is caused to rotate at a first speed (low speed) while the rotor 62 rotates at a given constant speed. The medium-speed mode refers to a speed mode in which the output part 8 is caused to rotate at a second speed (medium speed) higher than the first speed while the rotor 62 rotates at a given constant speed. The high-speed mode refers to a speed mode in which the output part 8 is caused to rotate at a third speed (high speed) higher than the second speed while the rotor 62 rotates at a given constant speed. The movable range of the speed switching lever 12 is defined in the front-to-rear direction.By operating (sliding) the speed switching lever 12 to move to a front portion of the movable range, the speed mode of the speed reduction mechanism 30 is set to the low speed mode. By operating the speed switching lever 12 to move to an intermediate portion of the movable range, the speed mode of the speed reduction mechanism 30 is set to the medium speed mode. By operating the speed switching lever 12 to move to a rear portion of the movable range, the speed mode of the speed reduction mechanism 30 is set to the high speed mode.

[0061] The mode switching ring 13 is operated (rotated) to change an operation mode of the hammer 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 a user. The operation mode of the hammer mechanism 40 includes a hammer mode and a non-hammer mode. The hammer mode refers to an operation mode in which the output part 8 is caused to hammer in the axial direction. The non-hammer mode refers to an operation mode in which the output part 8 is not caused to hammer in the axial direction. By operating the mode switching ring 13 in the rotation direction so that it is arranged in a hammer mode position, the operation mode of the hammer mechanism 40 is set to the hammer mode.By operating the mode switching ring 13 in the rotational direction so that it is located in the non-hammer mode position, the operation mode of the hammer mechanism 40 is set to the non-hammer mode.

[0062] The interface panel 15 is provided on the battery holding part 23. The interface panel 15 includes an operating device 24 and a display device 25. The interface panel 15 has a plate shape. The operating device 24 includes at least one operating button. Examples of the display device 25 include a segmented display device having a plurality of segmented light-emitting devices, a flat panel display such as a liquid crystal display, and a display-type display device on which a plurality of light-emitting diodes are arranged.

[0063] The battery holding part 23 has a panel opening 27. The panel opening 27 is located on the upper surface of the battery holding part 23, further forward than the handle part 22. At least a portion of the interface panel 15 is located in the panel opening 27.

[0064] The actuator 24 is operated (pressed) to change the drive mode of the motor 6. The actuator 24 is operated by a user. The drive modes of the motor 6 include a drilling mode and a screwdriving mode (clutch mode). The drilling mode refers to a drive mode in which, while driving the motor 6, the motor 6 is driven regardless of the torque acting on the motor 6. The screwdriving mode (clutch mode) refers to a drive mechanism in which, while driving the motor 6, the motor 6 is caused to stop when the instantaneous current supplied to the motor 6 exceeds a threshold electric current.

[0065] The rotary dial 16 is operated (rotated) to change a driving condition of the motor 6. The rotary dial 16 is arranged at a front portion of the battery holding part 23. The rotary dial 16 is rotatably supported by the battery holding part 23. The rotary dial 16 is rotatable by 360° or more. The rotary dial 16 is operated by a user. The driving conditions of the motor 6 include the electric current threshold. The rotary dial 16 is operated to change the electric current threshold in the screwing mode (clutch mode) set by the operating device 24.

[0066] The battery holding part 23 has a rotary wheel opening 28. The rotary wheel opening 28 is formed in a right-hand region of a front portion of the battery holding part 23. At least a portion of the rotary wheel 16 is arranged in the rotary wheel opening 28.

[0067] The controller 17 includes a computer system. The controller 17 outputs control commands for controlling the motor 6. At least a portion of the controller 17 is housed in a controller case 26. The controller 17 is housed in the battery holding part 23 while being held in the controller case 26. The controller 17 includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a central processing unit (CPU), a non-volatile memory such as a read-only memory (ROM), or a storage device, a volatile memory such as a random access memory (RAM), transistors, capacitors, and resistors.

[0068] The controller 17 sets the driving conditions of the motor 6 in response to the operation (rotation) of the rotary wheel 16. As described above, the driving conditions of the motor 6 include the electric current threshold. In the screwing mode (clutch mode), the controller 17 sets the electric current threshold in response to the operation of the rotary wheel 16.

[0069] In the screwing mode (clutch mode), the controller 17 stops the motor 6 when the torque acting on the motor 6 during driving of the motor 6 exceeds the electric current threshold.

[0070] The controller 17 controls the display device 25 to display the set drive condition of the motor 6. Engine and power transmission mechanism

[0071] As in Fig. As shown in Figure 4, the motor 6 includes a stator 61 having a tubular shape and a rotor 62 disposed inside the stator 61. The rotor 62 includes a rotor shaft 63 extending in the axial direction.

[0072] The stator 61 includes a stator core 61A comprising a plurality of stacked steel disks, a front insulating piece 61B disposed at a front portion of the stator core 61A, a rear insulating piece 61C disposed at a rear portion of the stator core 61A, a plurality of coils 61D wound around the stator core 61A and over the front insulating piece 61B and the rear insulating piece 61C, a sensor circuit board mounted on the front insulating piece 61B, and a short-circuit component supported by the front insulating piece 61B. The sensor circuit board 61E includes a plurality of rotation detecting elements for detecting the rotation of the rotor 62. The rotation detecting elements of the sensor circuit board detect the magnetic fields of the permanent magnets 62B, thereby detecting the rotation of the rotor 62.The controller 17 supplies drive currents to the coils 61D based on the detection data from the rotation detection elements. The short-circuit component connects the plurality of coils 61D via fuse terminals. The short-circuit component is connected to the controller 17 via lead wires.

[0073] The rotor 62 rotates around the rotation axis AX. The rotor 62 includes a rotor shaft 63, a rotor core 62A arranged around the rotor shaft 63, and the plurality of permanent magnets 62B held on (in) the rotor core 62A. The rotor core 62A has a cylindrical shape. The rotor core 62A includes a plurality of stacked steel disks. The rotor core 62A has through holes extending in the axial direction. The through holes are arranged at equal intervals in the circumferential direction. The permanent magnets 62B are respectively arranged (embedded) in the plurality of through holes of the rotor core 62A.

[0074] The rotor shaft 63 rotates about the rotation axis AX. The rotation axis AX of the rotor shaft 63 coincides with the rotation axis of the output part 8. A front portion of the rotor shaft 63 is rotatably supported by a (first) bearing 64. A rear portion of the rotor shaft 63 is rotatably supported by a (second) bearing 65. The bearing 64 is held by the motor mount 4C arranged in front of the stator 61. The bearing 65 is held by the rear cover 3. A front end portion of the rotor shaft 63 is arranged further forward than the bearing 64. A front end portion of the rotor shaft 63 is arranged in the interior of the housing 4.

[0075] A drive pinion 31S is provided at a front end portion of the rotor shaft 63. The drive pinion 31S functions as the sun gear of the first planetary gear mechanism 31. The drive pinion 31S is rotated by the motor 6. The drive pinion 31S has a large-diameter portion 311S and a small-diameter portion 312S located further forward than the large-diameter portion 311S. The rotor shaft 63 is coupled to the first planetary gear mechanism 31 of the speed reduction mechanism 30 via the drive pinion 31S.

[0076] Fig. 5 is an exploded rear perspective view illustrating the motor 6, the motor mount 4C, and the speed reduction mechanism 30 according to the embodiment. The motor mount 4C is arranged between the motor 6 and the speed reduction mechanism 30. The rotor shaft 63 of the motor 6 passes through the motor mount 4C to connect to the speed reduction mechanism 30 (drive pinion 31S). The spindle 81 is arranged in front of the speed reduction mechanism 30. The spindle 81 is coupled to a third bracket 33C of the speed reduction mechanism 30. In the embodiment, a pair of flat surfaces 81T are formed on the outer peripheral surface of the spindle 81. The flat surfaces 81T are parallel to the rotation axis AX. The pair of flat surfaces 81T face each other in opposite directions. The third bracket 33C is arranged around the spindle 81.An inner peripheral surface of the third carrier 33C has bearing surfaces, each of which is in contact with the pair of flat surfaces 81T. Relative rotation between the third carrier 33C and the spindle 81 is restricted (blocked, prevented) by the flat surfaces 81T. With the rotation of the third carrier 33C, the spindle 81 rotates together with the third carrier 33C.

[0077] As in Fig. As shown in Figure 4, the spindle 81 is rotatably supported by a (first) bearing 83 and a (second) bearing 84. The spindle 81 is movable in the front-to-back direction while supported by the bearing 83 and the bearing 84.

[0078] The spindle 81 has a flange portion 81F. A coil spring 87 is provided between the flange portion 81F and the bearing 83. The flange portion 81F contacts a front end portion of the coil spring 87. The coil spring 87 generates an elastic force that moves (urges) the spindle 81 forward.

[0079] The drill chuck 82 can hold a bit. The drill chuck 82 is coupled to a front portion of the spindle 81. A screw hole 81R is provided at a front end portion of the spindle 81. Rotation of the spindle 81 rotates the drill chuck 82. The drill chuck 82 rotates while holding the bit.

[0080] Fig. 6 is a rear perspective view showing a part of the speed reduction mechanism 30 according to the embodiment.

[0081] The speed switching lever 12 is operated (slid) to change the speed mode of the speed reduction mechanism 30. The speed switching lever 12 is mechanically connected to the speed reduction mechanism 30. The speed switching lever 12 is above the housing 4 (see Fig. 1). The speed switching lever 12 is movable (slidable) in the front-to-back direction. The speed switching lever 12 is configured to be operated by a user. The speed modes of the speed reduction mechanism 30 include the low speed mode (speed "1"), the medium speed mode (speed "2"), and the high speed mode (speed "3"). By operating the speed switching lever 12 to move to a front range of the movable range, the speed mode of the speed reduction mechanism 30 is set to the low speed mode (speed "1"). By operating the speed switching lever 12 to move to an intermediate range of the movable range, the speed mode of the speed reduction mechanism 30 is set to the medium speed mode (speed "2").By operating the speed switching lever 12 to move to a rear range of the movable range, the speed mode of the speed reduction mechanism 30 is set to the high speed mode (speed “3”).

[0082] Fig. 7 is an exploded rear perspective view illustrating the speed reduction mechanism according to the embodiment. Fig. Figure 8 is an exploded front perspective view illustrating the speed reduction mechanism according to the embodiment. Sun gears 32S and 33S are shown in a cylindrical shape with simplified teeth.

[0083] The first planetary gear mechanism 31 includes planetary gears 311P (first planetary gears), planetary gears 312P (second planetary gears) arranged further forward than the planetary gears 311P, a first-stage carrier 311C supporting both the plurality of planetary gears 311P and the plurality of planetary gears 312P, a second-stage carrier 312C supporting the plurality of planetary gears 312P, an internal gear 311R arranged around the plurality of planetary gears 311P, and an internal gear 312R arranged around the plurality of planetary gears 312P. The drive pinion 31S is provided at a front end portion of the rotor shaft 63. The drive pinion 31S functions as the sun gear of the first planetary gear mechanism 31. The drive pinion 31S is arranged in front of the stator 61. The drive pinion 31S is rotated by the rotor 62.The drive pinion 31S can be rotated directly or indirectly by the rotor 62.

[0084] The second planetary gear mechanism 32 includes a sun gear 32S, a plurality of planetary gears 32P arranged around the sun gear 32S, a second carrier 32C supporting the plurality of planetary gears 32P, and an internal gear 32R arranged around the plurality of planetary gears 32P. The sun gear 32S is arranged further forward than the internal gear 311R and the internal gear 312R. The sun gear 32S can be rotated directly or indirectly by 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.

[0085] The third planetary gear mechanism 33 includes a sun gear 33S, a plurality of planetary gears 33P arranged around the sun gear 33S, the third carrier 33C supporting the plurality of planetary gears 33P, and an internal gear 33R arranged around the plurality of planetary gears 33P.

[0086] The planetary gears 311P of the first planetary gear mechanism 31 are arranged around the large-diameter portion 311S of the drive pinion 31S. The planetary gears 312P are arranged around the small-diameter portion 312S of the drive pinion 31S.

[0087] The housing 4 accommodates the planetary gears 31S, the planetary gears 311P, the planetary gears 312P, the internal gear 311R, the internal gear 312R, the sun gear 332S, and the planetary gears 32P. The spindle 81 is arranged in front of the internal gear 33R. The spindle 81 can be rotated directly or indirectly by the planetary gears 33P.

[0088] The planetary gears 311P are rotatably supported by first pins 311A, respectively. The first pins 311A ​​are supported by the first-stage carrier 311C. The first pins 311A ​​protrude rearward from a rear surface of the first-stage carrier 311C. The first pins 311A ​​are provided at intervals in the circumferential direction. In the embodiment, four of the first pins 311A ​​are provided at equal intervals in the circumferential direction. One planetary gear 311P is supported on each first pin 311A ​​of the plurality of (four) first pins 311A. The planetary gears 311P are arranged further rearward than the first-stage carrier 311C. The first-stage carrier 311C rotatably supports the planetary gears 311P via the first pins 311A.

[0089] The planetary gears 312P are rotatably supported by second pins 312A, respectively. The second pins 312A are supported by both the first-stage carrier 311C and the second-stage carrier 312C. The first-stage carrier 311C is arranged further rearward than the second-stage carrier 312C. A rear end portion of each of the second pins 312A is supported by the first-stage carrier 311C. A front end portion of each of the second pins 312A is supported by the second-stage carrier 312C. The second pins 312A are provided spaced apart from each other in the circumferential direction. In the embodiment, four of the second pins 312A are provided equally spaced in the circumferential direction. In the circumferential direction, the positions of the first pins 311A ​​and the positions of the second pins 312A are different from each other. In the circumferential direction, each of the second pins 312A is arranged between a pair of adjacent first pins 311A.A planetary gear 312P is supported by each second pin 312A of the plurality of (four) second pins 312A. In the front-to-back direction (axial direction), the planetary gears 312P are arranged between the first-stage carrier 311C and the second-stage carrier 312C. The first-stage carrier 311C and the second-stage carrier 312C each rotatably support the planetary gears 312P via the second pins 312A. A gear is provided on an outer peripheral portion of the second-stage carrier 312C.

[0090] The internal gear 311R (first internal gear) is arranged around the plurality of planetary gears 311P. The internal gear 312R (second internal gear) is arranged around the plurality of planetary gears 312P. The outer diameter of the planetary gears 311P is smaller than the outer diameter of the planetary gears 312P.

[0091] The sun gear 32S of the second planetary gear mechanism 32 is arranged in front of the second-stage carrier 312C. The diameter of the sun gear 32S is smaller than the diameter of the second-stage carrier 312C. The second-stage carrier 312C and the sun gear 32S are integrated with each other. The second-stage carrier 312C and the sun gear 32S rotate together. Here, the pins 32A are provided on the second carrier 32C. The planetary gears 32P are rotatably supported by the pins 32A, respectively. The second carrier 32C rotatably supports the planetary gears 32P via the pins 32A.

[0092] The sun gear 33S of the third planetary gear mechanism 33 is arranged in front of the second carrier 32C. The diameter of the sun gear 33S is smaller than the diameter of the sun gear 32S. The second carrier 32C and the sun gear 33S are integrated with each other. The second carrier 32C and the sun gear 33S rotate together. Here, pins 33A are provided on the third carrier 33C. The planetary gears 33P are rotatably supported by the pins 33A, respectively. The third carrier 33C rotatably supports the planetary gears 33P via the pins 33A.

[0093] As in Fig. 6, the speed reduction mechanism 30 includes a first speed switching mechanism 71 and a second speed switching mechanism 72.

[0094] The first speed switching mechanism 71 switches between a first speed reduction ratio at which the rotation of the internal gear 32R of the first planetary gear mechanism 31 is blocked and rotation of the internal gear 311R is permitted, and a second speed reduction ratio at which the rotation of the internal gear 311R of the first planetary gear mechanism 31 is blocked and rotation of the internal gear 312R is permitted.

[0095] 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.

[0096] The change ring 500 has a ring portion 500B and a plurality of protruding portions 500C fixed to the ring portion 500B. The protruding portions 500C are in guide grooves 4K (see Fig. 5) provided in the inner peripheral surface of the first casing 4A. The guide grooves 4K extend in the front-to-back direction. By arranging the protruding portions 500C in the guide grooves 4K of the first casing 4A, rotation of the change ring 500 relative to the first casing 4A is restricted (blocked, prevented). The change ring 500 is movable in the front-to-back direction inside the first casing 4A. The change ring 500 can be moved in the front-to-back direction while being guided in the guide grooves 4K. The change ring 500 is arranged around at least one of the internal gear 311R and the internal gear 312R.

[0097] The change ring 500 is coupled to the first switching wire 510. The change ring 500 is movable in the front-to-back direction inside the first housing 4A. By moving the change ring 500 forward, the speed mode becomes the first speed reduction mode, and by moving the change ring 500 backward, the speed mode becomes the second speed reduction mode.

[0098] In the first planetary gear mechanism 31, the speed reduction ratio of a front stage including the planetary gears 312P and the internal gear 312R is larger than the speed reduction ratio of a rear stage including the planetary gears 311P and the internal gear 311R. When the drive pinion 31S rotates at a given constant speed, the speed of the second-stage carrier 312C in the first speed reduction mode is smaller than the speed of the second-stage carrier 312C in the second speed reduction mode.

[0099] In the embodiment, the speed reduction ratio of the second planetary gear mechanism 32 and the speed reduction ratio of the third planetary gear mechanism 33 are smaller than the speed reduction ratio of the rear stage (first stage) of the first planetary gear mechanism 31. The speed reduction ratio of the second planetary gear mechanism 32 is smaller than the speed reduction ratio of the third planetary gear mechanism 33.

[0100] As in Fig. 5 and Fig. 6, the first switching wire 510 is arranged on the outside of the first housing 4A. The first switching wire 510 is movable in the front-back direction on the outside of the first housing 4A. A tip portion of the first switching wire 510 is inserted into a groove 500A provided on the switching ring. The first housing 4A has a through-hole 4H. The tip portion of the first switching wire 510 is arranged inside the first housing 4A via the through-hole 4H. The tip portion of the first switching wire 510 is inserted into the groove 500A inside the first housing 4A. An upper portion of the first switching wire 510 is fixed to the first movable member 610. The first movable member 610 is connected to the speed switching lever 12. The first movable member 610 is guided in the front-to-back direction by a guide rod 600. The guide rod 600 is arranged to extend in the front-to-back direction.The guide rod 600 is fixed to the housing 4. A rear end portion of the guide rod 600 is fixed to the motor mount 4C. A front end portion of the guide rod 600 is fixed to the second housing 4B. The first movable member 610 has a first guide hole extending in the front-to-rear direction. The guide rod 600 passes through the first guide hole of the first movable member 610. The first spring 630 is a compression spring. A rear end portion of the first spring 630 is supported by the motor mount 4C. A front end portion of the first spring 630 is connected to the first movable member 610. The first spring 630 generates an elastic force, so that the first movable member 610 moves forward (in one direction). The first spring 630 biases the change ring 500 forward via the first movable member 610 and the first switching wire 510.

[0101] As in Fig. As shown in Fig. 8, cam teeth 311F are provided on an outer peripheral surface of the internal gear 311R. Cam teeth 312F are also provided on the outer peripheral surface of the internal gear 312R. Cam grooves 500D and cam grooves 500E are provided in the inner peripheral surface of the change ring 500. The cam grooves 500D are formed at a rear end portion of the change ring 500 and are engaged with the cam teeth 311F of the internal gear 311R. The cam grooves 500E are formed at a front end portion of the change ring 500 and are engaged with the cam teeth 312F of the internal gear 312R. The change ring 500 moves between a position where the cam grooves 500D are engaged with the cam teeth 311F and a position where the cam grooves 500E are engaged with the cam teeth 312F of the internal gear 312R while being guided by the guide grooves 4K of the first casing 4A.

[0102] The change ring 500 is connected to the speed switching lever 12 via the first switching wire 510 and the first movable member 610. When the speed switching lever 12 is operated (slid), the first movable member 610 moves in the front-to-back direction. By operating the speed switching lever 12 to move in the front-to-back direction, the first movable member 610 and the first switching wire 510 move in the front-to-back direction, and the change ring 500 moves in the front-to-back direction.

[0103] When the first movable member 610, the first switching wire 510, and the change ring 500 move forward, the change ring 500 is arranged around the internal gear 312R, and the cam grooves 500E and the cam teeth 312F are engaged with each other. This restricts (blocks, prevents) rotation of the internal gear 312R. That is, by moving the first movable member 610, the first switching wire 510, and the change ring 500 forward and restricting the rotation of the internal gear 312R, the first planetary gear mechanism 31 is placed in the first speed reduction mode.

[0104] When the first movable member 610, the first switching wire 510, and the change ring 500 move rearward to arrange the change ring 500 around the internal gear 311R, the cam grooves 500D and the cam teeth 311F are engaged with each other. This restricts rotation of the internal gear 311R. That is, by moving the first movable member 610, the first switching wire 510, and the change ring 500 rearward and restricting rotation of the internal gear 311R, the first planetary gear mechanism 31 is placed in the second speed reduction mode.

[0105] The second speed switching mechanism 72 switches between an activated mode in which the speed reduction function of the second planetary gear mechanism 32 is activated, and a deactivated mode in which the speed reduction function of the second planetary gear mechanism 32 is deactivated. Setting the second planetary gear mechanism 32 in the activated mode comprises restricting (blocking, preventing) the rotation of the internal gear 32R. Setting the second planetary gear mechanism 32 in the deactivated mode comprises allowing the rotation of the internal gear 32R. By restricting the rotation of the internal gear 32R, the second planetary gear mechanism 32 is placed in the activated mode. By allowing the rotation of the internal gear 32R, the second planetary gear mechanism 32 is placed in the deactivated mode.

[0106] As in Fig. 5 and Fig. 6, the second speed switching mechanism 72 includes a second switching wire 520 coupled to the internal gear 32R, cam teeth 33F provided on the internal gear 33R, a second movable member 620, and a second spring 640.

[0107] The second switching wire 520 is arranged on the outside of the first housing 4A. The second switching wire 520 is movable in the front-to-back direction on the outside of the first housing 4A. The tip portion of the second switching wire 520 is inserted into a groove 32E provided in the internal gear 32R. The first housing 4A has a through-hole 4J. The tip portion of the second switching wire 520 is arranged inside the first housing 4A through the through-hole 4J. The tip portion of the second switching wire 520 is inserted into the groove 32E inside the first housing 4A. An upper portion of the second switching wire 520 is fixed to the second movable member 620. The second movable member 620 is connected to the speed switching lever 12. The second movable member 620 is positioned further forward than the first movable member 610. The second movable member 620 is guided in the front-to-back direction by the guide rod 600.The second movable member 620 has a second guide hole extending in the front-to-back direction. The guide rod 600 passes through the second through hole of the second movable member 620. The second spring 640 is a compression spring. A front end portion of the second spring 640 is supported by the second case 4B. A rear end portion of the second spring 640 is connected to the second movable member 620. The second spring 640 generates an elastic force so that the second movable member 620 moves (urges) rearward. The second spring 640 biases the internal gear 32R rearward via the second movable member 620 and the second switching wire 520.

[0108] As in Fig. As shown in Fig. 7, cam teeth 32F are provided on the outer peripheral surface of the internal gear 32R. The cam teeth 32F can mesh with the cam teeth 33F on the inner peripheral surface of the internal gear 33R. By inserting the internal gear 32R into the internal gear 33R, rotation of the internal gear 32R is restricted (blocked, prevented) by the cam teeth 33F of the internal gear 33R.

[0109] 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 respectively inserted into recesses 4L provided on the inner peripheral surface of the second housing 4B. By inserting the cam teeth 33G into the recess 4L, relative movement between the internal gear 33R and the second housing 4B is restricted (blocked, prevented).

[0110] When the speed switching lever 12 is operated (slid), the second movable member 620 moves in the front-to-back direction. By operating the speed switching lever 12 so that it moves in the front-to-back direction, the second movable member 620 and the second switching wire 520 move in the front-to-back direction, and the internal gear 32R moves in the front-to-back direction. By moving the internal gear 32R in the front-to-back direction, the internal gear 32R is switched between the state in which the internal gear 32R is inserted into the internal gear 33R and the state in which the internal gear 32R is removed from the internal gear 33R.

[0111] By moving the second movable member 620, the second switching wire 520, and the internal gear 32R forward, inserting at least a portion of the internal gear 32R into the interior of the internal gear 33R, and meshing the cam teeth 33F of the internal gear 33R with the cam teeth 32F of the internal gear 32R, rotation of the internal gear 32R is restricted (blocked, prevented). That is, by moving the second movable member 620, the second switching wire 520, and the internal gear 32R forward and restricting the rotation of the internal gear 32R, the second planetary gear mechanism 32 is placed in the activated mode.

[0112] By moving the second movable member 620 of the second switching wire 520 and the internal gear 32R backward, removing the internal gear 32R from the inside of the internal gear 33R, and separating the cam teeth 33F of the internal gear 33R from the cam teeth 33F of the internal gear 32R, rotation of the internal gear 32R is enabled. That is, by moving the second movable member 620, the second switching wire 520, and the internal gear 32R backward and allowing rotation of the internal gear 32R, the second planetary gear mechanism 32 is placed in the deactivated mode.

[0113] When the second planetary gear mechanism 32 is in the activated mode, the internal gear 32R meshes only with the planetary gears 32P. When the second planetary gear mechanism 32 is in the deactivated mode, the internal gear 32R meshes with both the planetary gears 32P and the gear on the outer peripheral portion of the second-stage carrier 312C.

[0114] As described above, in the embodiment, the speed modes of the speed reduction mechanism 30 include the low speed mode (speed “1”), the medium speed mode (speed “2”), and the high speed mode (speed “3”).

[0115] The low-speed mode has the first planetary gear mechanism 31 set to the first speed reduction mode and the second planetary gear mechanism 32 set to the activated mode. By operating the speed switching lever 12 to move to the front of the movable range and moving the second movable member 620 forward, the first planetary gear mechanism 31 is set to the first speed reduction mode, and the second planetary gear mechanism 32 is set to the activated mode. That is, in the low-speed mode (speed "1"), 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 (activated).

[0116] The medium speed mode has the first planetary gear mechanism 31 set to the first speed reduction mode and the second planetary gear mechanism 32 set to the deactivated mode. By operating the speed switching lever 12 to move to the intermediate range of the movable range, the first planetary gear mechanism 31 is set to the first speed reduction mode, and the second planetary gear mechanism 32 is set to the deactivated mode. That is, in the medium speed mode (speed "2"), the front stage (second stage) of the first planetary gear mechanism 31 and the third planetary gear mechanism 33 are used (activated).

[0117] The high-speed mode has the first planetary gear mechanism 31 set to the second speed reduction mode and the second planetary gear mechanism 32 set to the deactivated mode. By operating the speed switching lever 12 to move to the rear of the movable range and moving the first movable member 610 rearward, the first planetary gear mechanism 31 is set to the second speed reduction mode, and the second planetary gear mechanism 32 is set to the deactivated mode. That is, in the high-speed mode (speed "3"), the rear stage (first stage) of the first planetary gear mechanism 31 and the third planetary gear mechanism 33 are used (activated).

[0118] The speed switching lever 12 is operated by the user, 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 guided by the guide rod 600. The speed switching lever 12 is operated by the user, 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 guided by the guide rod 600. The first spring 630 generates an elastic force, so that the first movable member 610 moves (is urged) forward. The second spring 640 generates an elastic force, so that the second movable member 620 moves (is urged) backward.

[0119] Fig. 9 is a top cross-sectional view showing a movement structure of the speed switching lever 12 according to the embodiment. To switch the speed reduction mechanism 30 from the medium speed mode (speed "2") to the low speed mode (speed "1"), the user operates (slides) the speed switching lever 12 against the elastic force (biasing force) of the second spring 640, so that the speed switching lever 12 moves forward. By moving the speed switching lever 12 forward, the second movable member 620 moves forward against the biasing force of the second spring 640. As shown in Fig. As shown in Fig. 9, a pair of walls 12A and 12B are provided on the lower surface of the speed switching lever 12. The walls 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. Leaf springs 530 are fixed to the pair of walls 12A and 12B. By inserting a projection 530T of the leaf springs 530 into the recesses 21A provided at portions of the motor housing part 21, the speed switching lever 12 is positioned at the speed "1" position. The recesses 21A are provided at positions corresponding to the speed "1" position, the speed "2" position, and the speed "3" position.

[0120] To switch the speed reduction mechanism 30 from the medium-speed mode (speed "2") to the high-speed mode (speed "3"), the user operates (slides) the speed switching lever 12 against the biasing force (elastic force) of the first spring 630, so that the speed switching lever 12 moves rearward. By inserting the projections 530T of the leaf springs 530 into the recesses 21A provided at positions corresponding to the speed "3" position, the speed switching lever 12 is positioned at the speed "3" position.

[0121] Similarly, to switch the speed reduction mechanism 30 from the low-speed mode (speed "1") to the medium-speed mode (speed "2"), the user operates (shifts) the speed switching lever 12 so that the speed switching lever 12 moves rearward. To switch the speed reduction mechanism 30 from the high-speed mode (speed "3") to the medium-speed mode (speed "2"), the user operates (shifts) the speed switching lever 12 so that the speed switching lever 12 moves forward. By inserting the projections 530T of the leaf springs 530 into the recesses 21A provided at a position corresponding to the speed "2" position, the speed switching lever 12 is positioned at the speed "2" position.

[0122] Fig. 10 is a cross-sectional view illustrating the hammer mechanism 40 according to the embodiment. The hammer mechanism 40 is arranged around the spindle 81. The first cam 41 and the second cam 42 of the hammer mechanism 40 are both arranged inside the second casing 4B. In the front-to-back direction, both the first cam 41 and the second cam 42 are arranged between the bearing 83 and the bearing 84.

[0123] The first cam 41 has a ring shape. The first cam 41 is arranged around the spindle 81. The first cam 41 is fixed to the spindle 81. The first cam 41 rotates together with the spindle 81. A cam gear is provided on a rear surface of the first cam 41. The first cam 41 is supported by a stop ring 44. The stop ring 44 is arranged around the spindle 81. In the front-to-back direction, the stop ring 44 is arranged between the first cam 41 and the bearing 83.

[0124] The second cam 41 has a ring shape. The second cam 42 is arranged behind the first cam 41. The second cam 42 is arranged around the spindle 81. The second cam 42 is rotatable relative to the spindle 81. A cam gear is provided on a front surface of the second cam 42. The cam gear on the front surface of the second cam 42 meshes with the cam gear on the rear surface of the first cam 41. A tab is provided on a rear surface of the second cam 42.

[0125] In the front-back direction, a bearing ring 45 is arranged between the second cam 42 and the bearing 84. The second bearing ring 45 is arranged inside the second housing 4B. The bearing ring 45 is fixed to the second housing 4B. A plurality of steel balls 46 are arranged on a front surface of the bearing ring 45. A washer 47 is arranged between the steel balls 46 and the second cam 42. In a space defined by the bearing ring 45 and the washer 47, the second cam 42 is rotatable in a state in which forward-backward movement is restricted.

[0126] The hammer switching ring 43 is switchable (changeable) between the hammer mechanism 40 and the non-hammer mode. The mode switching ring 13 is coupled to the hammer switching ring 43 via a cam ring 48. The mode switching ring 13 and the cam ring 48 are integrally rotatable. The hammer switching ring 43 is movable in the front-back direction. The hammer switching ring 43 has a projection 43T. The projection 43T is inserted into a guide hole provided in the second case 4B. The projection 43T restricts rotation of the hammer switching ring 43. The hammer switching ring 43 is arranged around the first cam 41 and the second cam 42. Furthermore, the hammer switching ring 43 has an opposing portion 43S located on a rear surface opposite the second cam 42. The opposite portion 43S projects radially inward from a rear portion of the hammer switch ring 43.

[0127] The hammer switching ring 43 is movable in the front-to-back direction while being guided by a guide hole provided in the second case 4B. The hammer switching ring 43 is pushed by the cam ring 48 to move backward along with rotation of the mode switching ring 13. The hammer switching ring 43 is biased forward by a spring 43A. When the mode switching ring 13 is returned and the pushing state by the cam ring 48 is released, the hammer switching ring 43 is pushed by the spring 43A to return to the front position. When the user operates the mode switching ring 13, the hammer switching ring 43 moves in the front-to-back direction. By moving the hammer switching ring 43 in the front-to-back direction between an advanced position and a retracted position, which is further rearward than the advanced position, the mode changes between the hammer mode and the non-hammer mode.By operating the mode switching ring 13, the mode changes between hammer mode and non-hammer mode.

[0128] The hammer mode includes the state in which the rotation of the second cam 42 is restricted (blocked). When the hammer switching ring 43 moves to the advanced position, the rotation of the second cam 42 is restricted (blocked). The non-hammer mode includes the state in which rotation of the second cam 42 is permitted. When the hammer switching ring 43 moves to the retracted position, rotation of the second cam 42 is permitted.

[0129] In the hammer mode, at least a portion of the hammer shift ring 43, which has been moved to the advanced position by being urged by the spring 43A, comes into contact with the second cam 42. When the hammer shift ring 43 and the second cam 42 come into contact with each other, rotation of the second cam 42 is restricted (blocked). When the hammer shift ring 43 moves to the advanced position, the tab on the rear surface of the second cam 42 and the opposing portion 43S of the hammer shift ring 43 come into contact with each other. This restricts rotation of the second cam 42. In the state where the rotation of the second cam 42 is restricted, when the motor 6 is driven, the first cam 41, which is fixed to the spindle 81, rotates while being in contact with the cam gear of the second cam 42. This causes the spindle 81 to rotate while hammering in the front-to-back direction.

[0130] In the non-hammering mode, the hammer switching ring 43, which has been moved to the retracted position by being pushed by the cam ring 48, is spaced from the second cam 42. When the hammer switching ring 43 has been moved to the retracted position, the opposing portion 43S of the hammer switching ring 43 is spaced from the second cam 42. Because the hammer switching ring 43 is spaced from the second cam 42, rotation of the second cam 42 is enabled. In the state where rotation of the second cam 42 is enabled, when the motor 6 is driven, the second cam 42 rotates together with the first cam 41 and the spindle 81. Thereby, the spindle 81 is rotated without hammering in the front-to-back direction. Element and lead wire

[0131] Fig. Fig. 11 is a rear perspective view showing the left housing 2L and the motor mount 4C according to the embodiment. As shown in Fig. As shown in Figure 11, the drill driver 1 includes an element 50 and a lead wire 51 connected to the element 50. The element 50 includes a sensor that detects a switching of the speed reduction ratio by the speed switching lever 12.

[0132] As in Fig. As shown in Figure 9, a detecting piece 12C is provided on the wall 12A of the speed control lever 12. The element 50 is arranged directly below the wall 12A. In the embodiment, the detecting piece 12C is a permanent magnet, and the element 50 is a magnetic sensor. As shown in Fig. 6, the element 50 is formed as a circuit board having a magnetic sensor. The lead wire 51 is connected to the circuit board. The element 50 detects a magnetic field generated by the detection piece 12C. The element 50 is connected to the controller 17 via the lead wire 51. The element 50 outputs a detection signal of the magnetic field of the controller 17. The position of the detection piece 12C varies according to the positions of the speed switching lever 12; that is, when the speed switching lever 12 is in the low-speed mode position (speed "1"), when the speed switching lever 12 is in the medium-speed mode position (speed "2"), and when the speed switching lever 12 is in the high-speed mode position (speed "3"). The detection signal output from the element 50 varies according to a position of the detection piece 12C.The controller 17 detects the mode in which the speed switching lever 12 is placed based on a change in the detection signal.

[0133] The element 50 is provided above the motor 6 or the speed reduction mechanism 30. The element 50 is positioned between the speed switching lever 12 and the speed reduction mechanism 30 in the up-down direction. The element 50 is fixed to the left housing 2L. As shown in Fig. As shown in Fig. 11, the lead wire 51 is connected to the element 50 and extends further downward than the motor 6 or the speed reduction mechanism 30. One end of the lead wire 51 is connected to the element 50, and the other end of the lead wire 51 is connected to the controller 17. The lead wire 51 passes downward from an upper portion of the left case 2L along an inner surface of the left case 2L via the left side of the motor housing part 21 (through a space in which the motor 6, the motor mount 4C, and the speed reduction mechanism 30 are arranged). The lead wire 51 extends to the controller 17 provided in the battery holding part 23 arranged below the motor 6.

[0134] In the embodiment, a passage LP through which the lead wire 51 passes is provided between the motor 6 and the speed reduction mechanism 30 in the front-to-back direction. Specifically, the motor mount 4C is arranged between the motor 6 and the speed reduction mechanism 30. The passage LP is arranged between the motor mount 4C and the casing 2 (left casing 2L) surrounding the outer periphery of the motor mount 4C. The passage LP is a linear region defined by the motor mount 4C and the left casing 2L and extends along the inner surface of the left casing 2L.

[0135] Fig. 12 is a rear perspective view showing the motor mount 4C according to the embodiment. Fig. 13 is a perspective view showing a part of the left housing 2L according to the embodiment. As shown in Fig. 13, the inner surface of the housing 2 has a recess 2A in which the lead wire 51 is arranged. The recess 2A is provided in the left housing 2L. At least a portion of the passage LP is formed by the recess 2A. The recess 2A is a recessed portion formed in the inner surface of the left housing 2L. The recess 2A extends in the up-down direction from an upper portion to a lower portion of the motor housing part 21 of the left housing 2L along the inner surface of the left housing 2L. The width of the recess 2A in the front-back direction is set according to the lead width of the lead wire 51, and a portion of the lead wire 51 is arranged in the recess 2A. A rear edge of the recess 2A has a plurality of guide projections 2B.A front edge of the recess 2A has a support wall 2C that supports a left side surface of the motor mount 4C. The plurality of guide projections 2B protrude from the inner surface of the left housing 2L. The plurality of guide projections 2B are spaced apart in the up-down direction along the recess 2A. The number of guide projections 2B is four. The support wall 2C protrudes from the inner surface of the left housing wall 2L. The front end of the support wall 2C is formed in a recess-protrusion relationship corresponding to the shape of the left side surface of the motor mount 4C, and the left side surface of the motor mount 4C is fitted into the front end of the support wall 2C.

[0136] As in Fig. As shown in Figure 12, the motor mount 4C is an annular plate member. The bearing 64 is attached to a central opening 91 of the motor mount 4C. Mounting parts 92, each of which has a screw insertion hole, are provided at four corners of the outer circumference of the motor mount 4C. The motor mount 4C is connected to fixing parts 4M (see Fig. 5) is attached to a rear end portion of the first enclosure 4A by using screws 4E (see Fig. 4) pass through the screw insertion holes of the mounting parts 92. The motor mount 4C functions as a rear support plate of the speed reduction mechanism 30 in the first casing 4A. The motor mount 4C functions as a positioning member that positions the motor 6 and the speed reduction mechanism 30. That is, the motor mount 4C functions as a positioning member so that the rotor shaft 63, which passes through the inside of the bearing 64, coincides with the center axis of the speed reduction mechanism 30. A rod support 93 is provided at an upper end portion of the motor mount 4C. The rod support 93 has a recess into which a rear end portion of the guide rod 600 is inserted.

[0137] In the embodiment, the motor mount 4C functions as a holding member that holds the lead wire 51. At a portion of the outer peripheral surface, the motor mount 4C comes into contact with the lead wire 51. The motor mount 4C has protrusions 94, 95 that protrude toward the recess 2A on the outer periphery of the motor mount 4C. The protrusions 94, 95 are provided on a left outer peripheral portion of the motor mount 4C and face the left housing 2L. The protrusions include a first protrusion 94 and second protrusions 95 in the circumferential direction of the motor mount 4C. In the embodiment, one first protrusion 94 and two second protrusions 95 are provided.

[0138] The first protrusion 94 is arranged on the side surface of the motor mount 4C. The first protrusion 94 is arranged on the left side surface of the motor mount 4C, substantially in the center of the motor mount 4C in the up-down direction. The first protrusion 94 is positioned to the left of the rotation axis (rotor shaft 63) of the motor 6, which is positioned in the center of the motor mount 4C. The second protrusions 95 can be arranged further up or down on the motor mount 4C than the first protrusion 94. One of the second protrusions 95 is provided on the outer periphery of the motor mount 4C at a higher position than the first protrusion 94, and the other is provided at a lower position than the first protrusion 94. The first protrusion 94 and the second protrusions 95 are each provided on the outer peripheral portion of a rear surface of the motor mount 4C, and each protrudes rearward from the motor mount 4C. As shown in Fig. 11, in the state where the motor mount 4C is attached to the support wall 2C of the left case 2L, the positions of the first projection 94 and the second projections 95 in the front-rear direction correspond to the position where the recess 2A is formed. The first projection 94 and the second projections 95 each protrude radially outward from the outer peripheral portion of the rear surface of the motor mount 4C. Therefore, each of the first projection 94 and the second projections 95 protrudes toward the recess 2A. The first projection 94 and the second projections 95 oppose the recess 2A in the radial direction of the motor mount 4C.

[0139] Fig. 14 is a back-to-front cross-sectional arrow view illustrating the passage LP of the lead wire 51 according to the embodiment. As shown in Fig. 14, in the radial direction of the rotational axis of the rotor shaft 63 of the motor 6, a distance L1 from the rotational axis to a front end of the first projection 94 is shorter than distances L2 and L3 from the rotational axis to front ends of the second projections 95. As shown in Fig. As shown in Fig. 12, the first protrusion 94 and the second protrusions 95 protrude radially outward from the outer peripheral portion of the motor mount 4C, and the protrusion amount of the first protrusion 94 is smaller than the protrusion amount of each of the second protrusions 95. Accordingly, the distance L1 is shorter than the distances L2 and L3. At the position where the first protrusion 94 is formed, the position of the inner surface of the left housing 2L (the inner bottom surface of the recess 2A) can be brought closer to the first protrusion 94 by decreasing the distance L1. Accordingly, the position of the outer surface of the housing 2L can be brought closer to the center side in the radial direction, whereby the width dimension of the housing 2 in the motor housing part 21 can be weakened.

[0140] The lead wire 51 is arranged to fit into the recess 2A and then be held from the right side by the respective protrusions (the first protrusion 94 and the second protrusions 95) of the motor mount 4C. Thus, the lead wire 51 is sandwiched between the housing 2 and the motor mount 4C. In other words, the lead wire 51 is held from the outside of the housing 2. The lead wire 51 is held from the inside by the motor mount 4C. The inner surface (recess 2A) of the left housing 2L is in contact with the lead wire 51 from the left side, and the respective protrusions (first protrusion 94 and second protrusions 95) come into contact with the lead wire 51 from the right side. This configuration makes it possible to prevent the positional displacement (lifting) of the lead wire 51 in the radial direction from the inner surface of the left housing 2L.Furthermore, the lead 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 lead wire 51 from the back, while the support wall 2C contacts the lead wire 51 from the front. This configuration prevents the positional displacement of the lead wire 51 in the front-to-back direction on the inner surface of the left housing 2L. handle

[0141] Fig. 15 is a front perspective view illustrating the drill driver 1 with an attached handle 100 according to the embodiment. Fig. 16 is a perspective view illustrating an attachment part 110 of the handle 100 according to the embodiment. Fig. 17 is a back-to-front cross-sectional arrow view illustrating engagement between the handle 100 and the attachment part 110 according to the embodiment.

[0142] As in Fig. 15, Fig. 16 and Fig. As shown in Figure 17, the drill driver 1 can be used with the handle 100 removably attached thereto. By grasping the grip portion 22 with one hand and grasping the handle 100 with the other hand, the user can stably and firmly hold the drill driver 1 during work. The handle 100 can be attached to the housing 2 or to the case 4. In the embodiment, the handle 100 can be attached to and detached from the second case 4B of the case 4. The second case 4B is provided with the attachment portion 110 for attaching the handle 100.

[0143] The handle 100 includes a handle 101, an arm 102, and a band 103. The arm 102 is attached to one end of the handle 101. The arm 102 is a hollow tubular member made of metal. The attachment part 110 has a circular cross-section when viewed in the front-back direction. One end portion 102A of the arm 102 is formed in a recessed arc shape along with the outer peripheral portion of the attachment part 110 (second casing 4B). The end portion 102A of the arm 102 is open. The band 103 is a wide belt-shaped member. Both ends of the band 103 are inserted into the opening of the end portion 102A of the arm 102, so that they are connected to the handle 101 inside the arm 102. This forms the strap 103 into a loop shape. The handle 101 is rotatable about a longitudinal axis (central axis) relative to the arm 102.When the handle 101 is rotated in one direction, the handle 101 pulls the band 103 into the arm 102 due to the rotation to reduce a loop diameter of the band 103. When the handle 101 is rotated in the other direction, the handle 101 extends the band 103 from the arm 102 due to the rotation to increase the loop diameter of the band 103. The attachment part 110 of the second case 4B can be arranged inside the loop of the band 103 with an increased loop diameter. By reducing the loop diameter in the state where the attachment part 110 is arranged inside the loop of the band 103, the band 103 pulls the attachment part 110 toward the end portion 102A of the arm 102 and tightens it. Tightened by the band 103, the arm 102 is fixed to the attachment part 110.

[0144] The attachment part 110 of the second housing 4B and the end portion 102A of the arm 102 can be engaged with each other. This engagement prevents positional displacement of the arm 102 in the circumferential direction of the attachment part 110. The attachment part 110 is provided with a plurality of engagement recesses 111. The engagement recesses 111 are formed at equiangular intervals over the entire circumference of the attachment part 110 in the circumferential direction. The engagement recesses 111 are formed in two rows at a front end portion of the attachment part 110 and a rear end portion of the attachment part 110. Flanges 112 projecting outward in the radial direction are provided on both outer sides of the two rows of engagement recesses 111.In other words, the attachment portion 110 is formed between the pair of flanges 112 to have an outer diameter smaller than the diameters of the flanges 112. The end portion 102A of the arm 102 is attached between the pair of flanges 112. The engaging recesses 111 and the pair of flanges 112 prevent positional displacement of the arm 102 in the front-to-back direction.

[0145] The end portion 102A of the arm 102 is provided with engaging projections 104 to be engaged with the engaging recesses 111. The engaging projections 104 are formed in two rows in the front-to-back direction, corresponding to the engaging recesses 111 in two rows in the front-to-back direction. The two rows of engaging projections 104 are formed at one end of the front wall 102B and one end of the rear wall 102B, which define the opening of the arm 102. The engaging projections 104 in each row are formed in the circumferential direction of the end portion 102A. The engaging projections 104 are formed in a range from one end to the other end of the end portion 102A of the arm 102. The engaging projections 104 engage with the engaging recesses 111 in a row arranged in the circumferential direction of the attachment part 110.The two rows of engaging projections 104 are fitted into the two rows of engaging recesses 111, thereby completing the engagement of the arm 102 and the attachment part 110 with each other.

[0146] As in Fig. As shown in Fig. 17, the engaging recesses 111 are arranged on the entire circumference of the attachment part 110 at equiangular intervals of a predetermined angle θ. In the embodiment, the angle θ is 15 degrees. Twenty-four engaging recesses 111 are arranged on the entire circumference of the attachment part 110 at intervals of 15 degrees. Similar to the engaging recesses 111, the engaging projections 104 of the end portion 102A of the arm 102 are formed at equiangular intervals of angle θ. In the embodiment, there are eight engaging projections 104 per row. The arm 102 engages the attachment part 110 with a total of 16 positions (8 x 2 rows) of engaging projections 104 and engaging recesses 111. The handle 100 can be attached to the attachment part 110 in any direction with an angle θ as a unit.

[0147] At the time of attaching the handle 100, the user places the attachment part 110 of the second casing 4B inside the loop of the band 103 with the enlarged loop diameter of the band 103. The user brings the end portion 102A of the arm 102 into contact with the attachment part 110 so that the engaging projections 104 fit into the engaging recesses 111. The user rotates the handle 101 in a direction to reduce the loop diameter of the band 103. The fastening force of the band 103 maintains a state in which the end portion 102A of the arm 102 is pressed against the attachment part 110. With this configuration, the handle 100 is attached to the attachment part 110.When the handle 100 is removed or the attachment position is changed, it is only necessary to rotate the handle 101 in the other direction to increase the loop diameter of the band 103, so that the state in which the end portion 102A of the arm 102 is pressed against the attachment part 110 is released. Effects

[0148] In the above-described embodiment, the drill driver 1 may include the motor 6, the output part 8 provided on the front side of the motor 6 and driven by the motor 6, the speed reduction mechanism 30 disposed between the motor 6 and the output part 8, the motor mount 4C disposed between the motor 6 and the speed reduction mechanism 30, the casing 2 housing the motor 6 and the motor mount 4C, the member 50 provided above the motor 6 or the speed reduction mechanism 30, and the lead wire 51 connected to the member 50 and extending further downward than the motor 6 or the speed reduction mechanism 30. The lead wire 51 may be sandwiched between the casing 2 and the motor mount 4C.

[0149] With the configuration described above, the lead wire 51 connected to the element 50 is properly held while preventing an increase in the outer dimension.

[0150] In the embodiment, the drill driver 1 may have the recess 2A on the inner surface of the housing 2, in which the lead wires 51 are arranged.

[0151] With the configuration described above, the positional displacement of the lead wire 51 is effectively prevented.

[0152] In the embodiment, the drill driver 1 may have the projections 94, 95 projecting toward the recess 2A on the outer periphery of the motor mount 4C.

[0153] With the configuration described above, the positional displacement of the lead wire 51 between the recess 2A and the projections 94, 95 can be more effectively prevented.

[0154] In the embodiment, the protrusion may include the first protrusion 94 and the second protrusion 95 in the circumferential direction of the motor mount 4C. In the radial direction of the rotation axis (rotor shaft 63) of the motor 6, the distance from the rotation axis to the front end of the first protrusion 94 may be shorter than the distance from the rotation axis to the front end of the second protrusion 95.

[0155] With the configuration described above, even with the projections, the outer shape of the housing 2 is less likely to be enlarged at the formation position of the first projection 94, whereby an enlargement of the drill driver 1 can be prevented.

[0156] In the embodiment, the first protrusion 94 may be disposed on the side surface of the motor mount 4C. The second protrusion 95 may be disposed further up or down on the motor mount 4C than the first protrusion 94.

[0157] With the configuration described above, the width dimension of the drill driver 1 is reduced.

[0158] In the embodiment, the drill driver 1 may further include a hammer mechanism 40 that hammers the output part 8.

[0159] With the configuration described above, drilling can be performed using hammers. Even in the case of hammers, the positional displacement of the lead wire 51 due to hammering is effectively prevented.

[0160] In the embodiment, the speed reduction mechanism 30 may be a multi-stage speed change mechanism. The drill driver 1 may further include a speed switching lever 12 disposed at an upper portion of the housing 2 for switching a speed reduction ratio of the speed reduction mechanism 30. The element 50 may include a sensor that detects switching of the speed reduction ratio by the speed switching lever 12.

[0161] With the configuration described above, the lead wire 51 connected to the sensor in the upper portion of the housing 2 is properly held.

[0162] In the embodiment, the drill driver 1, which is an impact drill, may include the motor 6, the output part 8 provided in front of the motor 6 and driven by the motor 6, the speed reduction mechanism 30 disposed between the motor 6 and the output part 8, the hammer mechanism 40 disposed between the speed reduction mechanism 30 and the output part 8, the motor mount 4C disposed between the motor 6 and the speed reduction mechanism 30, the housing 2 accommodating the motor 6 and the motor mount 4C, the member 50 provided above the motor 6 or the speed reduction mechanism 30, and the lead wire 51 connected to the member 50 and extending further downward than the motor 6. The lead wire 51 may be held by the motor mount 4C.

[0163] With the configuration described above, the lead wire 51 connected to the element 50 is properly held while preventing an increase in the outer dimension. Even in the case of hammering, positional displacement of the lead wire 51 due to hammering can be effectively prevented.

[0164] In the embodiment, the drill driver 1, which is a hammer drill driver, may include the motor 6, the output part 8 provided in front of the motor 6 and driven by the motor 6, the speed reduction mechanism 30 disposed between the motor 6 and the output part 8, the hammer mechanism 40 disposed between the output part 8 and the speed reduction mechanism 30, the housing 2 accommodating the motor 6 and the speed reduction mechanism 30, the member 50 provided above the motor 6 and the speed reduction mechanism 30, and the controller 17 provided below the motor 6 and connected to the member 50 via the lead wire 51. The passage LP through which the lead wire 51 passes may be provided between the motor 6 and the speed reduction mechanism 30 in the front-to-back direction.

[0165] With the configuration described above, the lead wire 51 connected to the element 50 is properly held while preventing an increase in the outer dimension. Even in the case of hammering, positional displacement of the lead wire 51 due to hammering is effectively prevented.

[0166] In the embodiment, the drill driver 1, which is an impact driver, may further include the motor mount 4C disposed between the motor 6 and the speed reduction mechanism 30 for positioning the motor 6 and the speed reduction mechanism 30. The passage LP may be provided between the motor mount 4C and the housing 2 surrounding the outer periphery of the motor mount 4C.

[0167] With the configuration described above, the passage LP of the lead wire 51 is constructed without increasing the number of components. Further embodiments

[0168] In the above-described embodiment, the battery pack 20 attached to the battery mounting part 5 is used as the power source of the drill driver 1. A commercial power source (AC power source) can be used as a power source of the drill driver 1.

[0169] In the above-described embodiment, the element 50 to which the lead wire 51 is connected includes the sensor that detects the switching of the speed reduction ratio by the speed switching lever 12. The element 50 to which the lead wire 51 is connected may be a sensor other than the sensor that detects the switching of the speed reduction ratio by the speed switching lever 12.

[0170] Fig. 18 and Fig. 19 are schematic drawings illustrating an element 50 according to another embodiment. In Fig. 18 and Fig. In Figure 19, the external shape of the drill driver 1 (housing 2) is indicated by a dotted line, while the motor 6, the motor mount 4C, the speed reduction mechanism 30, the speed control lever 12, and the element 50 are indicated by solid lines. The lead wire 51 is indicated by a two-dot chain line.

[0171] In Fig. 18, the element 50 includes an indicator light that indicates the driving state of the motor 6. The element 50 includes, for example, a light-emitting part 151 and a circuit board 152. The light-emitting part 151 includes, for example, a light-emitting diode (LED) element. The light-emitting part 151 emits light by supplying power via the lead wire 51. The light-emitting part 151 is exposed from an upper portion of the housing 2 or is visible through a translucent window member provided at the upper portion of the housing 2. The element 50 may include a plurality of light-emitting parts 151. For example, the controller 17 turns on the indicator light while the motor 6 is rotating. The controller 17 changes, for example, the lighting states of the indicator light therein when the motor 6 rotates in one direction and when the motor 6 rotates in the other direction.Changing the lighting states includes using different light emission colors, using different lighting (flashing) intervals, or changing the light-emitting parts 151 to emit light, for example. For example, when the electric current value of the motor 6 exceeds a threshold value, the controller 17 turns on the indicator light.

[0172] The element 50 is provided above the motor 6. In this case too, the lead wire 51 is connected to the element 50 via the passage LP (see Fig. 11) is connected between the motor 6 and the speed reduction mechanism 30 in the front-to-back direction. The lead wire 51 is sandwiched between the housing 2 and the motor mount 4C and held by the motor mount 4C.

[0173] As described above, in the embodiment, the element 50 includes the indicator lamp that indicates the driving state of the motor 6. With the above-described configuration, the lead wire 51 connected to the indicator lamp is properly maintained.

[0174] In Fig. 19, the element 50 has an operation switch that receives an operation input. The element 50 has an input part 153 and a circuit board 154. The input part 153 has an input device that receives an operation input. The input device can be a button switch or other mechanical switch, a touch sensor, a non-contact sensor, or the like. The input part 153 outputs a signal corresponding to the operation input of the controller 17 via the lead wire 51. The input part 153 is exposed from an upper portion of the housing 2 or can be operated through a window member provided at the upper portion of the housing 2. The element 50 can have a plurality of input parts 153. The controller 17 receives, for example, an operation for changing the mode of the drill driver 1 via an operation switch. The controller 17 switches the operating mode of the motor 6, for example.according to the operation input. The controller 17 changes the maximum torque value of the motor 6 according to the switching of the operating mode. The controller 17 changes the maximum speed of the motor 6 according to the switching of the operating mode. The operating device 24 and the display device 25, such as the interface panel 15 of the above-described embodiment, can be used as the element 50 of FIG. Fig. 19 should be provided.

[0175] The element 50 is provided above the motor 6. In this case too, the lead wire 51 is connected to the element 50 via the passage LP (see Fig. 11) is connected between the motor 6 and the speed reduction mechanism 30 in the front-to-back direction. The lead wire 51 is sandwiched between the housing 2 and the motor mount 4C and held by the motor mount 4C.

[0176] In the embodiment, the element 50 may include an operation switch that receives an operation input. With the above-described configuration, the lead wire 51 connected to the operation switch is properly held.

[0177] In the above-described embodiment, the lead wire 51 is sandwiched between the motor mount 4C and the housing 2 (left housing 2L). The lead wire 51 need not be sandwiched between the motor mount 4C and the housing 2 (left housing 2L).

[0178] Fig. 20 is a perspective view illustrating a motor mount according to another embodiment. In Fig. 20, the lead wire 51 is indicated by a two-dotted dash line. In Fig. 20, the motor mount 4C is provided with a passage LP. The motor mount 4C has tubular portions 191, which are a passage of the lead wire 51, on the outer peripheral portion in the left direction. Both ends of each of the tubular portions 191 are open, and each of the tubular portions 191 has an inner space penetrating in the circumferential direction of the motor mount 4C. Three tubular portions 191 are provided corresponding to the first projection 94 and the second projections 95, which are in Fig. 12. These three tubular portions 191 form the passage LP through which the lead wire 51 passes. In Fig. 20, the lead wire 51 is held by the motor mount 4C.

[0179] Fig. 21 is a left side view illustrating an engine mount according to yet another embodiment. In Fig. 21, the lead wire 51 is indicated by a two-dotted dash line. In Fig. 21, the motor mount 4C has a passage LP. The motor mount 4C has, at an outer peripheral portion on the left side, the passage LP formed with pairs of walls 192A and 192B. The pairs of walls 192A and 192B protrude outward in the radial direction from the outer peripheral portion of the motor mount 4C. The walls 192A and 192B in each pair are spaced apart from each other in the front-rear direction. Gaps between the walls 192A and 192B form the passage LP. The size of the gap between the walls 192A and 192B in each pair (i.e., the width of the passage LP) is set to a width suitable for holding the lead wire 51. Each of the walls 192A has a projecting wall protruding toward the wall 192B at an intermediate position of the passage LP.Each of the walls 192B has a recess formed in a direction away from the wall 192A (toward the rear side) at at least one corresponding position with respect to the projecting wall of the wall 192A. The passage LP has a curved shape due to the projecting wall of the wall 192A and the recess of the wall 192B. The lead wire 51 is inserted through the passage LP having the curved shape. The lead wire 51 is curved in the passage LP, thereby increasing frictional resistance between the lead wire 51 and the walls 192A and 192B. Accordingly, the lead wire 51 is fixed in the passage LP. Since the pairs of walls 192A and 192B protrude outward in the radial direction, the passage LP is opened outward in the radial direction. The open area of ​​the passage LP is covered by the inner surface of the housing 2 (left housing 2L), thereby preventing removal of the lead wire 51 from the passage LP.Three pairs of walls 192A and 192B are provided corresponding to the first projection 94 and the second projections 95 shown in FIG. Fig. 12 are shown. In Fig. 20, the lead wire 51 is held by the motor mount 4C.

[0180] In the embodiment described above and the modifications of Fig. 20 and Fig. 21, the lead wire 51 passes between the left side surface of the motor mount 4C and the left housing 2L. The lead wire 51 can pass between the right side surface of the motor mount 4C and the right housing 2R.

[0181] In the above-described configuration, the passage LP between the motor 6 and the speed reduction mechanism 30 is provided between the motor mount 4C and the housing 2. The passage LP between the motor 6 and the speed reduction mechanism 30 may be provided in a member other than the motor mount 4C. For example, a member for forming the passage LP through which the lead wire 51 passes may be added between the motor 6 and the motor mount 4C.

[0182] According to the technology disclosed in the present specification, it is possible to properly maintain the lead wire connected to the element while preventing an increase in the outer dimension.

[0183] Although the invention has been described with reference to specific embodiments for a full and clear disclosure, the appended claims are not to be considered limiting, but are to be interpreted to include all modifications and alternative constructions that could be contemplated by one skilled in the art and which reasonably fall within the basic teachings presented herein.

[0184] It is explicitly emphasized that all features disclosed in the description and / or the claims are to be considered separate and independent of each other for the purpose of the original disclosure as well as for the purpose of limiting the claimed invention, regardless of the feature combinations in the embodiments and / or the claims. It is explicitly stated that all range specifications or specifications of groups of units disclose every possible intermediate value or subgroup of units for the purpose of the original disclosure as well as for the purpose of limiting the claimed invention, in particular also as a limit of a range specification. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2021 - 171 857 A

[0002]

Claims

[1] Drill driver, with an engine, an output part which is provided in front of the engine and is driven by the engine, a speed reduction mechanism arranged between the motor and the output part, a motor mount arranged between the motor and the speed reduction mechanism, a housing that houses the motor and the motor mount, an element provided above the motor or speed reduction mechanism, and a lead wire connected to the element and extending further down than the motor or speed reduction mechanism, in which the lead wire is sandwiched between the housing and the motor mount. [2] A drill driver according to claim 1, wherein the housing has a recess on an inner surface of the housing in which the lead wire is arranged. [3] A drill driver according to claim 2, wherein the motor mount has a projection on an outer periphery of the motor mount that projects toward the recess. [4] Drill driver according to claim 3, wherein the projection has a first projection and a second projection arranged in a circumferential direction of the motor mount, and in a radial direction of a rotation axis of the motor, a distance from the rotation axis to a front end of the first projection is shorter than a distance from the rotation axis to a front end of the second projection. [5] Drill driver according to claim 4, in which the first projection is arranged on a side surface of the motor mount, and the second projection on the motor mount is positioned further up or down than the first projection. [6] A drill driver according to any one of claims 1 to 5, further comprising a hammer mechanism that hammers the output part. [7] Drill driver according to one of claims 1 to 6, in which the speed reduction mechanism is a multi-stage speed change mechanism, the drill driver further comprises a speed switching lever arranged at an upper portion of the housing and configured to switch a speed reduction ratio of the speed reduction mechanism, and the element has a sensor that detects the switching of the speed reduction ratio by the speed control lever. [8] A drill driver according to any one of claims 1 to 6, wherein the element comprises an indicator light indicating a driving state of the motor. [9] A drill driver according to any one of claims 1 to 6, wherein the element comprises an actuating switch that receives an actuating input. [10] Impact drill, with an engine, an output part which is arranged in front of the motor and is driven by the motor, a speed reduction mechanism arranged between the motor and the output part, a hammer mechanism arranged between the speed reduction mechanism and the output part, a motor mount arranged between the motor and the speed reduction mechanism, a housing that houses the motor and the motor mount, an element provided above the motor or speed reduction mechanism, and a lead wire connected to the element and extending further down than the motor, where the lead wire is held by the motor mount. [11] Impact drill with an engine, an output part which is arranged in front of the motor and is driven by the motor, a speed reduction mechanism arranged between the motor and the output part, a hammer mechanism arranged between the output part and the speed reduction mechanism, a housing that houses the motor and the speed reduction mechanism, an element provided above the motor or speed reduction mechanism, and a control located below the motor and connected to the element via a lead wire, wherein a passage through which the lead wire passes is provided between the motor and the speed reduction mechanism in a front-to-back direction. [12] Impact drill according to claim 11, further comprising a motor mount arranged between the motor and the speed reduction mechanism so as to position the motor and the speed reduction mechanism, in which the passage is provided between the motor mount and the housing surrounding an outer periphery of the motor mount.

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