Power tool

Abstract

To inhibit size increase of an electric tool.SOLUTION: An electric tool includes: a motor having a rotor which rotates around a rotation axis extending in an anteroposterior direction; a motor housing part which houses at least a part of the motor; a grip part protruding downward from the motor housing part; a spindle which is at least partially disposed at the front relative to the rotor and rotated by the rotor; an anvil to which a tip tool is attached; a striking mechanism which strikes the anvil in a rotation direction based on rotation of the spindle; and a light which lights the front side of the anvil. In the anteroposterior direction, the light overlaps with at least a part of the anvil.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to power tools. [Background technology]

[0002] 2. Description of the Related Art In the technical field of power tools, an impact tool having a motor housing and a grip housing, as disclosed in Patent Document 1, is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-015897 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for miniaturization of power tools to improve operability. For example, when a light for illuminating the front of the power tool is provided on the side of the motor housing, if the light protrudes from the side of the motor housing, the operability of the power tool may be reduced when working in a narrow space.

[0005] The present disclosure aims to prevent an increase in the size of a power tool. [Means for solving the problem]

[0006] According to the first disclosure, there is provided an electric tool comprising: a motor having a rotor that rotates around a rotation axis extending in the fore-and-aft direction; a motor accommodating section that accommodates at least a portion of the motor; a grip section that protrudes downward from the motor accommodating section; a spindle at least a portion of which is positioned forward of the rotor and rotated by the rotor; an anvil on which a tool tip is attached; a striking mechanism that strikes the anvil in the rotational direction based on rotation of the spindle; and a light that illuminates in front of the anvil, wherein the light overlaps at least a portion of the anvil in the fore-and-aft direction.

[0007] According to the second disclosure, there is provided an electric tool comprising: a motor having a stator and a rotor rotating relative to the stator; a motor housing portion accommodating at least a portion of the motor; a grip portion protruding downward from the motor housing portion; a spindle rotated by the rotor; a hammer held by the spindle; an anvil to which a tool tip is attached and which is struck in the rotational direction by the hammer; a hammer case accommodating the hammer; a first light illuminating the front of the anvil and positioned on the left side of the hammer case; and a second light positioned on the right side of the hammer case, wherein each of the first light and the second light overlaps at least a portion of the anvil in the front-to-rear direction.

[0008] According to the third disclosure, a brushless motor includes a stator having a stator core and a coil, and a rotor rotatable on the inner periphery side of the stator and having a rotor core, a magnet, and a rotor shaft, a gear driven by the rotor, a gear case accommodating the gear, an output shaft protruding from the gear case and rotated by the gear, a left housing supporting a left outer periphery side of the stator and covering at least a part of a left portion of the gear case, a right housing supporting a right outer periphery side of the stator and covering at least a part of a right portion of the gear case, and a grip housing extending downward from the left housing and the right housing. the left housing at the position where the left screw is located protrudes to the left of the left housing at the position where the left light is located, and the right housing at the position where the right screw is located protrudes to the right of the right housing at the position where the right light is located. Effect of the Invention

[0009] According to the present disclosure, the size of the power tool is suppressed. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a power tool according to an embodiment. [Diagram 2] FIG. 2 is a side view showing the power tool according to the embodiment. [Diagram 3] FIG. 3 is a front view showing an upper portion of the power tool according to the embodiment. [Figure 4] FIG. 4 is a plan view showing an upper portion of the power tool according to the embodiment. [Diagram 5] FIG. 5 is a vertical cross-sectional view showing the power tool according to the embodiment. [Figure 6] FIG. 6 is a vertical cross-sectional view showing an upper portion of the power tool according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing an upper portion of the power tool according to the embodiment. [Figure 8] FIG. 8 is a side view showing the rotor, rotor bearing, and fan according to the embodiment. [Figure 9] FIG. 9 is a perspective view showing a rotor, a rotor bearing, and a fan according to the embodiment. [Figure 10] FIG. 10 is an exploded perspective view showing the rotor, rotor bearing, and fan according to the embodiment. [Figure 11] FIG. 11 is a side view showing the core portion and the shaft portion according to the embodiment. [Figure 12] FIG. 12 is a cross-sectional view showing a part of the power tool according to the embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a part of the power tool according to the embodiment. [Figure 14A] FIG. 14A is a side view showing a modified example of the rotor, rotor bearing, and fan according to the embodiment. [Figure 14B] FIG. 14B is a cross-sectional view taken along line AA in FIG. 14A. [Figure 15A] FIG. 15A is a side view showing a modified example of the rotor, rotor bearing, and fan according to the embodiment. [Figure 15B]FIG. 15B is a cross-sectional view taken along line AA in FIG. 15A. [Figure 16A] FIG. 16A is a side view showing a modified example of the rotor, rotor bearing, and fan according to the embodiment. [Figure 16B] FIG. 16B is a cross-sectional view taken along line AA in FIG. 16A. [Figure 17A] FIG. 17A is a side view showing a modified example of the rotor, rotor bearing, and fan according to the embodiment. [Figure 17B] FIG. 17B is a cross-sectional view taken along line AA in FIG. 17A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment. The components of the embodiments described below can be appropriately combined. In addition, some components may not be used.

[0012] In the embodiment, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the center of the power tool 1. In the embodiment, the power tool 1 is a rotary tool having a motor 6.

[0013] In the embodiment, the direction parallel to the rotation axis AX of the motor 6 is referred to as the axial direction, the direction circumferential around the rotation axis AX is referred to as the circumferential direction or rotation direction, and the radial direction of the rotation axis AX is referred to as the radial direction.

[0014] The rotation axis AX extends in the front-rear direction. One axial side is the front, and the other axial side is the rear. In addition, in the radial direction, a position closer to or approaching the rotation axis AX is appropriately referred to as the radially inner side, and a position farther from or away from the rotation axis AX is appropriately referred to as the radially outer side.

[0015] [Power tools] FIG. 1 is a perspective view of a power tool 1 according to an embodiment. FIG. 2 is a side view of the power tool 1 according to an embodiment. FIG. 3 is a front view of an upper portion of the power tool 1 according to an embodiment. FIG. 4 is a plan view of an upper portion of the power tool 1 according to an embodiment. FIG. 5 is a vertical cross-sectional view of the power tool 1 according to an embodiment. FIG. 6 is a vertical cross-sectional view of an upper portion of the power tool 1 according to an embodiment. FIG. 7 is a cross-sectional view of an upper portion of the power tool 1 according to an embodiment.

[0016] In the embodiment, the power tool 1 is an impact driver, which is a type of screw tightening tool. The power tool 1 includes a housing 2, a rear cover 3, a hammer case 4, a battery mounting section 5, a motor 6, a reduction mechanism 7, a spindle 8, a striking mechanism 9, an anvil 10, a chuck sleeve 11, a fan 12, a controller 13, a trigger switch 14, a forward / reverse switching lever 15, an operation panel 16, a mode switching switch 17, and a light 18.

[0017] The housing 2 is made of synthetic resin. In this embodiment, the housing 2 is made of nylon. The housing 2 includes a left housing 2L and a right housing 2R disposed to the right of the left housing 2L. As shown in FIG. 2, the left housing 2L and the right housing 2R are fixed together by a plurality of screws 2S. The housing 2 is composed of a pair of half housings.

[0018] The housing 2 has a motor accommodating portion 21, a grip portion 22, and a controller accommodating portion 23.

[0019] The motor accommodating portion 21 is cylindrical and accommodates at least a portion of the motor 6 therein.

[0020] The grip portion 22 protrudes downward from the motor accommodating portion 21. The grip portion 22 functions as a grip housing extending downward from the left housing 2L and the right housing 2R. The trigger switch 14 is provided on an upper portion of the grip portion 22. The grip portion 22 is held by an operator.

[0021] The controller accommodating portion 23 is connected to a lower end of the grip portion 22. The controller accommodating portion 23 accommodates the controller 13. The outer dimensions of the controller accommodating portion 23 are larger than the outer dimensions of the grip portion 22 in both the front-rear and left-right directions.

[0022] The rear cover 3 is made of synthetic resin. The rear cover 3 is disposed rearward of the motor housing portion 21. The rear cover 3 accommodates at least a portion of the fan 12. The fan 12 is disposed on the inner peripheral side of the rear cover 3. The rear cover 3 is disposed so as to cover an opening at the rear end portion of the motor housing portion 21. The outer surface of the rear cover 3 has a gradually smaller diameter going from the front to the rear.

[0023] The motor accommodating portion 21 has an air intake port 19. The rear cover 3 has an air exhaust port 20. Air in the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 19. Air in the internal space of the housing 2 flows out to the external space of the housing 2 through the air exhaust port 20.

[0024] The hammer case 4 is made of metal. In the embodiment, the hammer case 4 is made of aluminum. The hammer case 4 is disposed in front of the motor accommodating section 21. The hammer case 4 is connected to the front part of the motor accommodating section 21. The hammer case 4 is cylindrical. The inner diameter of the front part 4F of the hammer case 4 is smaller than the inner diameter of the rear part 4R of the hammer case 4. The rear part of the hammer case 4 is inserted into the opening of the front part of the motor accommodating section 21. The rear part of the hammer case 4 is fitted inside the front part of the motor accommodating section 21. The motor accommodating section 21 and the hammer case 4 are connected via a bearing box 24. At least a portion of the bearing box 24 is disposed inside the hammer case 4. The bearing box 24 is fixed to each of the motor accommodating section 21 and the hammer case 4.

[0025] The hammer case 4 houses at least a part of the reduction gear mechanism 7, the spindle 8, the striking mechanism 9, and the anvil 10. At least a part of the reduction gear mechanism 7 is disposed inside the bearing box 24. The reduction gear mechanism 7 includes a plurality of gears. The hammer case 4 functions as a gear case that houses the gears.

[0026] At least a portion of the hammer case 4 is covered with a hammer case cover 4A. A bumper 4B is disposed on a front portion 4F of the hammer case 4. The bumper 4B is annular.

[0027] The battery mounting section 5 is formed at the bottom of the controller housing section 23. The battery mounting section 5 is connected to the battery pack 25. The battery pack 25 is mounted to the battery mounting section 5. The battery pack 25 is detachable from the battery mounting section 5. The battery pack 25 includes a secondary battery. In the embodiment, the battery pack 25 includes a rechargeable lithium ion battery. When mounted to the battery mounting section 5, the battery pack 25 can supply power to the power tool 1. The motor 6 is driven based on the power supplied from the battery pack 25. The controller 13 and the operation panel 16 operate based on the power supplied from the battery pack 25.

[0028] The motor 6 is a power source of the power tool 1. The motor 6 is an inner rotor type brushless motor. The motor 6 has a stator 26 and a rotor 27. At least a portion of the rotor 27 is disposed inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates about a rotation axis AX extending in the front-rear direction. The rotor 27 is rotatable on the inner peripheral side of the stator 26.

[0029] The stator 26 includes a stator core 28 , a front insulator 29 , a rear insulator 30 , and a coil 31 .

[0030] The stator core 28 is disposed radially outward of the rotor 27. The stator core 28 includes a plurality of stacked steel plates. The steel plates are metal plates whose main component is iron. The stator core 28 is cylindrical. The stator core 28 has a plurality of teeth that support the coils 31.

[0031] The front insulator 29 is provided at the front of the stator core 28. The rear insulator 30 is provided at the rear of the stator core 28. The front insulator 29 and the rear insulator 30 are each an electrical insulating member made of synthetic resin. The front insulator 29 is disposed so as to cover a portion of the surface of the teeth. The rear insulator 30 is disposed so as to cover a portion of the surface of the teeth.

[0032] The coil 31 is attached to the stator core 28 via the front insulator 29 and the rear insulator 30. A plurality of coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulator 29 and the rear insulator 30. The coils 31 and the stator core 28 are electrically insulated by the front insulator 29 and the rear insulator 30. The multiple coils 31 are connected via fusing terminals 38. The coils 31 are connected to the controller 13 via lead wires (not shown).

[0033] A left outer circumferential side of the stator 26 is supported by the left housing 2L. The left housing 2L covers at least a portion of the left part of the hammer case 4. A right outer circumferential side of the stator 26 is supported by the right housing 2R. The right housing 2R covers at least a portion of the right part of the hammer case 4.

[0034] The rotor 27 rotates about a rotation axis AX. The rotor 27 has a core portion 32, a shaft portion 33, a rotor magnet 34, and a sensor magnet 35. The core portion 32 functions as a rotor core of the rotor 27. The shaft portion 33 functions as a rotor shaft of the rotor 27.

[0035] Each of the core portion 32 and the shaft portion 33 is made of steel. The shaft portion 33 protrudes in the front-rear direction from an end face of the core portion 32. The shaft portion 33 includes a front shaft portion 33F protruding forward from the front end face of the core portion 32 and a rear shaft portion 33R protruding rearward from the rear end face of the core portion 32.

[0036] The rotor magnet 34 is fixed to the core portion 32. The rotor magnet 34 is cylindrical. The rotor magnet 34 is disposed around the core portion 32.

[0037] The sensor magnet 35 is fixed to the core portion 32. The sensor magnet 35 is annular. The sensor magnet 35 is disposed on the front end surface of the core portion 32 and the front end surface of the rotor magnet .

[0038] A sensor board 37 is attached to the front insulator 29. The sensor board 37 is fixed to the front insulator 29 with screws 29S. The sensor board 37 has a disk-shaped circuit board with a hole in the center, and a rotation detection element 37S supported by the circuit board. At least a portion of the sensor board 37 faces the sensor magnet 35. The rotation detection element detects the position of the sensor magnet 35 of the rotor 27, thereby detecting the position of the rotor 27 in the rotational direction.

[0039] The shaft portion 33 is rotatably supported by a rotor bearing 39. The rotor bearing 39 includes a front rotor bearing 39F that rotatably supports the front shaft portion 33F, and a rear rotor bearing 39R that rotatably supports the rear shaft portion 33R.

[0040] The front rotor bearing 39F is held in the bearing box 24. The bearing box 24 has a recess 241 recessed forward from the rear surface of the bearing box 24. The front rotor bearing 39F is disposed in the recess 241. The rear rotor bearing 39R is held in the rear cover 3. The front end of the front shaft portion 33F is disposed in the internal space of the hammer case 4 through an opening in the bearing box 24.

[0041] A pinion gear 41 is formed on the front end of the front shaft portion 33F. The pinion gear 41 is connected to at least a part of the reduction gear mechanism 7. The front shaft portion 33F is connected to the reduction gear mechanism 7 via the pinion gear 41.

[0042] The reduction mechanism 7 is disposed forward of the motor 6. The reduction mechanism 7 connects the front shaft portion 33F and the spindle 8. The reduction mechanism 7 transmits the rotation of the rotor 27 to the spindle 8. The reduction mechanism 7 rotates the spindle 8 at a rotation speed lower than the rotation speed of the front shaft portion 33F. The reduction mechanism 7 includes a planetary gear mechanism.

[0043] The reduction mechanism 7 has a plurality of gears. The gears of the reduction mechanism 7 are driven by a rotor 27.

[0044] The reduction mechanism 7 has a plurality of planetary gears 42 arranged around the pinion gear 41, and an internal gear 43 arranged around the plurality of planetary gears 42. The pinion gear 41, the planetary gear 42, and the internal gear 43 are each housed in the hammer case 4. Each of the plurality of planetary gears 42 meshes with the pinion gear 41. The planetary gear 42 is rotatably supported by the spindle 8 via a pin 42P. The spindle 8 is rotated by the planetary gear 42. The internal gear 43 has internal teeth that mesh with the planetary gear 42. The internal gear 43 is fixed to the bearing box 24. The internal gear 43 is always non-rotatable with respect to the bearing box 24.

[0045] When the front shaft portion 33F is rotated by the drive of the motor 6, the pinion gear 41 rotates and the planetary gear 42 revolves around the pinion gear 41. The planetary gear 42 revolves while meshing with the internal teeth of the internal gear 43. Due to the revolution of the planetary gear 42, the spindle 8 connected to the planetary gear 42 via the pin 42P rotates at a rotational speed lower than the rotational speed of the shaft portion 33.

[0046] The spindle 8 is disposed forward of at least a portion of the motor 6. The spindle 8 is disposed forward of the stator 26. At least a portion of the spindle 8 is disposed forward of the rotor 27. At least a portion of the spindle 8 is disposed in front of the reduction mechanism 7. The spindle 8 rotates by the rotation of the rotor 27 transmitted by the reduction mechanism 7. The spindle 8 is an output part of the power tool 1 that is rotated by the rotor 27. The spindle 8 is an output shaft that protrudes from the hammer case 4 and is rotated by a gear of the reduction mechanism 7.

[0047] The spindle 8 has a flange portion 44 and a rod portion 45 protruding forward from the flange portion 44. The planetary gear 42 is rotatably supported on the flange portion 44 via a pin 42P. The rotation axis of the spindle 8 and the rotation axis AX of the motor 6 coincide with each other. The spindle 8 rotates about the rotation axis AX. The spindle 8 is rotatably supported by a spindle bearing 46. A peripheral wall portion 81 is provided at the rear end of the spindle 8 so as to surround the spindle bearing 46. The spindle bearing 46 supports the peripheral wall portion 81 of the spindle 8.

[0048] The bearing box 24 is disposed around at least a portion of the circumference of the spindle 8. The spindle bearing 46 is held in the bearing box 24. The bearing box 24 has a recess 242 recessed rearward from the front surface of the bearing box 24. The spindle bearing 46 is disposed in the recess 242.

[0049] The spindle 8 has a supply port 92 for supplying lubricating oil. The lubricating oil includes grease. The supply port 92 is provided in the rod portion 45. The spindle 8 has an internal space 94 in which the lubricating oil is accommodated. The supply port 92 is connected to the internal space 94. The lubricating oil is supplied from the supply port 92 to at least a portion of the periphery of the spindle 8 by the centrifugal force of the spindle 8.

[0050] The striking mechanism 9 strikes the anvil 10 in a rotational direction based on the rotation of the spindle 8. The striking mechanism 9 has a hammer 47, a ball 48, and a coil spring 49. The striking mechanism 9 including the hammer 47 is housed in the hammer case 4.

[0051] The hammer 47 is disposed forward of the reduction mechanism 7. The hammer 47 is disposed around the spindle 8. The hammer 47 is held by the spindle 8. The ball 48 is disposed between the spindle 8 and the hammer 47. The coil spring 49 is supported by each of the spindle 8 and the hammer 47.

[0052] The hammer 47 is cylindrical. The hammer 47 is disposed around the rod portion 45. The hammer 47 has a hole 57 in which the rod portion 45 is disposed. The hammer 47 is rotatable together with the spindle 8. The rotation axis of the hammer 47, the rotation axis of the spindle 8, and the rotation axis AX of the motor 6 coincide with each other. The hammer 47 rotates around the rotation axis AX.

[0053] The ball 48 is made of a metal such as steel. The ball 48 is disposed between the rod portion 45 and the hammer 47. The spindle 8 has a spindle groove 50 in which at least a part of the ball 48 is disposed. The spindle groove 50 is provided on a part of the outer surface of the rod portion 45. The hammer 47 has a hammer groove 51 in which at least a part of the ball 48 is disposed. The hammer groove 51 is provided on a part of the inner surface of the hammer 47. The ball 48 is disposed between the spindle groove 50 and the hammer groove 51. The ball 48 can roll on the inside of the spindle groove 50 and the inside of the hammer groove 51. The hammer 47 can move together with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial direction and the rotational direction within a movable range defined by the spindle groove 50 and the hammer groove 51.

[0054] The coil spring 49 generates an elastic force that moves the hammer 47 forward. The coil spring 49 is disposed between the flange portion 44 and the hammer 47. A ring-shaped recess 53 is provided on the rear surface of the hammer 47. The recess 53 is recessed forward from the rear surface of the hammer 47. A washer 54 is provided inside the recess 53. The rear end of the coil spring 49 is supported by the flange portion 44. The front end of the coil spring 49 is disposed inside the recess 53 and supported by the washer 54.

[0055] At least a portion of the anvil 10 is positioned forward of the hammer 47. The anvil 10 has an insertion hole 55 into which the tool bit is inserted. The insertion hole 55 is provided at the front end of the anvil 10. The tool bit is attached to the anvil 10. The anvil 10 also has a hole 58 in which the front end of the rod portion 45 is disposed. The hole 58 is provided at the rear end of the anvil 10. The front end of the rod portion 45 is disposed in the hole 58.

[0056] The anvil 10 is rotatable together with the hammer 47. The rotation axis of the anvil 10, the rotation axis of the hammer 47, the rotation axis of the spindle 8, and the rotation axis AX of the motor 6 are coincident with each other. The anvil 10 rotates around the rotation axis AX. The anvil is rotatably supported by a pair of anvil bearings 56. The pair of anvil bearings 56 are held by the hammer case 4.

[0057] The hammer 47 has a cylindrical hammer body 471 and a hammer protrusion 472. The recess 53 is provided on the rear surface of the hammer body 471. The hammer protrusion 472 is provided on the front portion of the hammer body 471. Two hammer protrusions 472 are provided. The hammer protrusions 472 protrude forward from the front portion of the hammer body 471.

[0058] The anvil 10 has a rod-shaped anvil body 101 and an anvil protrusion 102. The insertion hole 55 is provided at the front end of the anvil body 101. The tip tool is attached to the anvil body 101. The anvil protrusion 102 is provided at the rear end of the anvil 10. Two anvil protrusions 102 are provided. The anvil protrusions 102 protrude radially outward from the rear end of the anvil body 101.

[0059] The hammer protrusion 472 and the anvil protrusion 102 are capable of coming into contact with each other. When the motor 6 is driven in a state in which the hammer protrusion 472 and the anvil protrusion 102 are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0060] The anvil 10 is struck in the rotational direction by the hammer 47. For example, in a screw tightening operation, when the load acting on the anvil 10 becomes high, a situation may occur in which the anvil 10 cannot be rotated by the power generated by the motor 6 alone. When the anvil 10 cannot be rotated by the power generated by the motor 6 alone, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 can move relatively in the axial direction and the circumferential direction via the ball 48. Even if the rotation of the hammer 47 stops, the rotation of the spindle 8 continues by the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the ball 48 moves backward while being guided by the spindle groove 50 and the hammer groove 51. The hammer 47 receives a force from the ball 48 and moves backward along with the ball 48. That is, the hammer 47 moves backward by the rotation of the spindle 8 while the rotation of the anvil 10 is stopped. As the hammer 47 moves rearward, the contact between the hammer protrusion 472 and the anvil protrusion 102 is released.

[0061] The coil spring 49 generates an elastic force that moves the hammer 47 forward. The hammer 47 that has moved backward moves forward due to the elastic force of the coil spring 49. When the hammer 47 moves forward, it receives a force in the rotational direction from the ball 48. That is, the hammer 47 moves forward while rotating. When the hammer 47 moves forward while rotating, the hammer protrusion 472 comes into contact with the anvil protrusion 102 while rotating. As a result, the anvil protrusion 102 is struck in the rotational direction by the hammer protrusion 472. Both the power of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. Therefore, the anvil 10 can rotate about the rotation axis AX with high torque.

[0062] The chuck sleeve 11 is disposed around the front portion of the anvil 10. The chuck sleeve 11 holds the tool bit inserted into the insertion hole 55.

[0063] The fan 12 is disposed behind the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is configured to have a smaller diameter than the stator core 28. Since the outer diameter of the fan 12 is smaller than the outer diameter of the stator core 28, the rear cover 3 that houses the fan 12 can be made smaller.

[0064] The fan 12 is fixed to at least a part of the rotor 27. The fan 12 is fixed to the rear part of the rear shaft part 33R via a bush 61. The fan 12 is disposed between the rear rotor bearing 39R and the stator 26. The fan 12 rotates by the rotation of the rotor 27. As the rear shaft part 33R rotates, the fan 12 rotates together with the rear shaft part 33R. As the fan 12 rotates, air in the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. The air that has flowed into the internal space of the housing 2 circulates through the internal space of the housing 2 to cool the motor 6. As the fan 12 rotates, the air that has circulated through the internal space of the housing 2 flows out through the exhaust port 20 to the external space of the housing 2.

[0065] The controller 13 is accommodated in the controller accommodating section 23. The controller 13 outputs a control signal for controlling the motor 6. The controller 13 includes a board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the board include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or storage, a volatile memory such as a RAM (Random Access Memory), a transistor, and a resistor.

[0066] The controller 13 switches the control mode of the motor 6 based on the operation of the power tool 1. The control mode of the motor 6 refers to a control method or control pattern of the motor 6.

[0067] The trigger switch 14 is provided on the grip portion 22. The trigger switch 14 is operated by an operator to start the motor 6. The trigger switch 14 includes a trigger member 14A and a switch body 14B. The switch body 14B is housed in the grip portion 22. The trigger member 14A protrudes forward from an upper part of the front part of the grip portion 22. The trigger member 14A is operated by an operator. By operating the trigger member 14A, the motor 6 is switched between being driven and being stopped.

[0068] The forward / reverse switching lever 15 is provided on the upper part of the grip portion 22. The forward / reverse switching lever 15 is operated by an operator. By operating the forward / reverse switching lever 15, the rotation direction of the motor 6 is switched from one of the forward direction and the reverse direction to the other. By switching the rotation direction of the motor 6, the rotation direction of the spindle 8 is switched.

[0069] The operation panel 16 is provided in the controller accommodating portion 23. The operation panel 16 is operated by an operator to switch the control mode of the motor 6. The operation panel 16 is plate-shaped. The controller accommodating portion 23 has an opening 63 in which the operation panel 16 is disposed. The opening 63 is provided on the upper surface of the controller accommodating portion 23, forward of the grip portion 22. At least a portion of the operation panel 16 is disposed in the opening 63.

[0070] The operation panel 16 has an impact force switch 64 and a dedicated switch 65. Each of the impact force switch 64 and the dedicated switch 65 is operated by an operator. By operating at least one of the impact force switch 64 and the dedicated switch 65, the control mode of the motor 6 is switched.

[0071] The mode changeover switch 17 is provided on the upper part of the trigger member 14A. The mode changeover switch 17 is operated by an operator. By operating the mode changeover switch 17, the control mode of the motor 6 is switched.

[0072] The light 18 illuminates the front of the anvil 10. The light 18 emits illumination light that illuminates the front of the power tool 1. The light 18 is held at the front end of the motor housing portion 21. The light 18 includes, for example, a light emitting diode (LED).

[0073] The light 18 includes a first light 18L disposed on the left side of the hammer case 4 and a second light 18R disposed on the right side of the hammer case 4. The first light 18L is disposed on the left side of the anvil 10. The second light 18R is disposed on the right side of the anvil 10.

[0074] 6, a recess 331F is provided at the front end of the front shaft portion 33F. The recess 331F reduces the load applied to the pinion gear 41. In addition, vibration of the rotor 27 is suppressed.

[0075] 6, a recess 331R is provided at the front end of the rear shaft portion 33R. The recess 331R makes it easier to press-fit the rear rotor bearing 39R into the rear shaft portion 33R. In addition, vibration of the rotor 27 is suppressed.

[0076] [Rotor] Fig. 8 is a side view showing the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 9 is a perspective view showing the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 10 is an exploded perspective view showing the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 11 is a side view showing the core portion 32 and shaft portion 33 according to the embodiment.

[0077] The rotor 27 has a core portion 32, a shaft portion 33 protruding from an end face of the core portion 32, a rotor magnet 34 arranged around the core portion 32, and a sensor magnet 35 facing the end face of the core portion 32.

[0078] The core portion 32 is made of steel and has a cylindrical shape.

[0079] The shaft portion 33 is made of steel. The shaft portion 33 is integral with the core portion 32. The core portion 32 and the shaft portion 33 are a single member. The shaft portion 33 protrudes in the front-rear direction from an end face of the core portion 32. The shaft portion 33 extends in the front-rear direction. The shaft portion 33 includes a front shaft portion 33F that protrudes forward from a front end face 32F of the core portion 32, and a rear shaft portion 33R that protrudes rearward from a rear end face 32R of the core portion 32.

[0080] Since the core portion 32 and the shaft portion 33 are a single member, relative slippage between the core portion 32 and the shaft portion 33 is suppressed. In addition, the central axis of the core portion 32 and the shaft portion 33 can be made to coincide with each other. Since relative slippage between the core portion 32 and the shaft portion 33 is suppressed and the central axis of the core portion 32 and the shaft portion 33 are made to coincide with each other, the power of the motor 6 is appropriately transmitted to the anvil 10 via the spindle 8. Therefore, deterioration in the performance of the power tool 1 is suppressed.

[0081] A pinion gear 41 is formed on the front end of the front shaft portion 33F, and is connected to at least a part of the reduction gear mechanism 7. The pinion gear 41 is integral with the front shaft portion 33F. The front shaft portion 33F and the pinion gear 41 are a single member.

[0082] The core portion 32 and the shaft portion 33 are formed, for example, by cutting a steel columnar member. The pinion gear 41 is formed by cutting a part of the front shaft portion 33F.

[0083] Since the front shaft portion 33F and the pinion gear 41 are a single member, the upper portion of the power tool 1 is prevented from becoming large in size in the front-rear direction. For example, when the pinion gear 41 is pressed into the front end portion of the front shaft portion 33F, it is necessary to provide a press-fit portion for the pinion gear 41. If the pinion gear 41 is provided with a press-fit portion, it becomes difficult to reduce the size of the upper portion of the power tool 1 in the front-rear direction. In the embodiment, since the front shaft portion 33F and the pinion gear 41 are a single member, it is not necessary to provide a press-fit portion for the pinion gear 41. Therefore, the upper portion of the power tool 1 is prevented from becoming large in size in the front-rear direction. In addition, since the relative slip between the shaft portion 33 and the pinion gear 41 is suppressed, the power of the motor 6 is appropriately transmitted to the anvil 10 via the spindle 8. Therefore, the deterioration of the performance of the power tool 1 is suppressed.

[0084] The rotor magnet 34 is a permanent magnet. The rotor magnet 34 is cylindrical. The rotor magnet 34 includes a first permanent magnet of a first polarity and a second permanent magnet of a second polarity. The first permanent magnets and the second permanent magnets are alternately arranged in the circumferential direction to form the cylindrical rotor magnet 34. The rotor magnet 34 is arranged around the core portion 32. The core portion 32 is arranged inside the rotor magnet 34. The rotor magnet 34 is fixed to the core portion 32 by an adhesive.

[0085] The sensor magnet 35 is a permanent magnet. The sensor magnet 35 is annular. The sensor magnet 35 is fixed to an end face of the core portion 32. In the embodiment, the sensor magnet 35 is fixed to the front end face 32F of the core portion 32 by an adhesive. The sensor magnet 35 is disposed forward of the core portion 32 and the rotor magnet 34. The sensor magnet 35 is disposed around the front shaft portion 33F.

[0086] The shaft portion 33 is rotatably supported by a rotor bearing 39. The rotor bearing 39 includes a front rotor bearing 39F that rotatably supports the front shaft portion 33F, and a rear rotor bearing 39R that rotatably supports the rear shaft portion 33R. As shown in FIGS. 6 and 7, the front rotor bearing 39F is held in the bearing box 24. The rear rotor bearing 39R is held in the rear cover 3.

[0087] Since the front shaft portion 33F is supported by the front rotor bearing 39F and the rear shaft portion 33R is supported by the rear rotor bearing 39R, the rotor 27 can rotate properly.

[0088] The front rotor bearing 39F supports a front support portion 331 defined in the front shaft portion 33F between the rear end of the front shaft portion 33F and the rear end of the pinion gear 41. The rear rotor bearing 39R supports a rear support portion 332 defined in the rear shaft portion 33R between the front end of the rear shaft portion 33R and the rear end of the rear shaft portion 33R. The rear end of the front shaft portion 33F includes a boundary portion between the front shaft portion 33F and the front end surface 32F of the core portion 32. The front end of the rear shaft portion 33R includes a boundary portion between the rear shaft portion 33R and the rear end surface 32R of the core portion 32.

[0089] The fan 12 is fixed to the rear part of the rear shaft part 33R via the bush 61. The fan 12 is fixed to a fan fixing part 333 defined in the rear shaft part 33R between the front end part of the rear shaft part 33R and the rear end part of the rear shaft part 33R. The fan fixing part 333 is defined forward of the rear support part 332.

[0090] The front shaft portion 33F has a protrusion 330 provided between a front end surface 32F of the core portion 32 and the front rotor bearing 39F.

[0091] The front shaft portion 33F has a transition portion 334F between the protrusion 330 and the front support portion 331. The outer diameter Da of the pinion gear 41 is smaller than the outer diameter Db of the front support portion 331. The outer diameter Dc of the transition portion 334F is smaller than the outer diameter Db of the front support portion 331. The outer diameter Dc of the transition portion 334F is larger than the outer diameter Da of the pinion gear 41. The outer diameter Dd of the protrusion 330 is larger than the outer diameter Db of the front support portion 331. The outer diameter De of the front shaft portion 33F behind the protrusion 330 is smaller than the outer diameter Dd of the protrusion 330. The outer diameter De is larger than the outer diameter Db. That is, the relationship [Dd>De>Db>Dc>Da] is established.

[0092] The rear shaft portion 33R has a transition portion 334R between the rear end surface 32R of the core portion 32 and the fan fixing portion 333. An outer diameter Dg of the transition portion 334R is smaller than the outer diameter Dh of the rear support portion 332 and the fan fixing portion 333. In other words, the relationship [Dh>Dg] holds.

[0093] In addition, the relationship [Dd>De>Db>Dc>Da>Dh>Dg] holds.

[0094] That is, the outer diameter De of the front shaft portion 33F is larger than the outer diameter Dh of the rear shaft portion 33R. In other words, the front shaft portion 33F is thicker than the rear shaft portion 33R.

[0095] By providing transition portion 334F and transition portion 334R, rotor 27 becomes easier to manufacture.

[0096] A step portion is provided on each of the front and rear sides of the protrusion 330. The step portion on the front side of the protrusion 330 is formed by the front surface of the protrusion 330 and the outer surface of the transition portion 334F. The step portion on the rear side of the protrusion 330 is formed by the rear surface of the protrusion 330 and the outer surface of the front shaft portion 33F rearward of the protrusion 330. The front surface of the protrusion 330 contacts with a part of the rear surface of the front rotor bearing 39F. That is, the front rotor bearing 39F contacts with the step portion on the front side of the protrusion 330. The front rotor bearing 39F is press-fitted into the front shaft portion 33F from the front of the front shaft portion 33F, and the front surface of the protrusion 330 contacts with a part of the rear surface of the front rotor bearing 39F, so that the front rotor bearing 39F is positioned at an appropriate position. The protrusion 330 is provided between the rear end of the front shaft portion 33F and the front support portion 331. The protrusion 330 protrudes radially outward from the outer surface of the front shaft portion 33F. The protrusion 330 is disposed so as to surround the rotation axis AX. In a plane perpendicular to the rotation axis AX, the protrusion 330 has an annular shape.

[0097] When the sensor magnet 35 is fixed to the front end surface 32F of the core portion 32 with an adhesive, for example, during assembly of the rotor 27, the adhesive may flow out from between the sensor magnet 35 and the core portion 32 or between the sensor magnet 35 and the front shaft portion 33F on the inner diameter side of the sensor magnet 35. In addition, if the adhesive melts due to heat generated by the motor 6, the adhesive may flow out from between the sensor magnet 35 and the core portion 32. Even if the adhesive flows out from between the sensor magnet 35 and the core portion 32, the protrusion 330 prevents the adhesive from flowing into the front rotor bearing 39F (front support portion 331).

[0098] The outer diameter of the front shaft portion 33F is larger than the outer diameter of the rear shaft portion 33R. That is, the front shaft portion 33F is thicker than the rear shaft portion 33R.

[0099] Since the outer diameter of the front shaft portion 33F is larger than that of the rear shaft portion 33R, the pinion gear 41 is smoothly formed on the front shaft portion 33F by, for example, cutting. Even if a twist occurs between the core portion 32 and the pinion gear 41, the front shaft portion 33F can withstand the twisting force because the front shaft portion 33F is thick. Since a large twisting force does not act on the rear shaft portion 33R, the rear shaft portion 33R may be thin.

[0100] The inner diameter of the front rotor bearing 39F is larger than the outer diameter of the pinion gear 41.

[0101] Since the inner diameter of the front rotor bearing 39F is larger than the outer diameter of the pinion gear 41, during assembly of the rotor 27, the front rotor bearing 39F is inserted into the front shaft portion 33F from the front of the front shaft portion 33F and then positioned in the front support portion 331.

[0102] FIG. 12 is a cross-sectional view showing a part of the power tool 1 according to the embodiment, and corresponds to an enlarged view of a part of FIG.

[0103] The front rotor bearing 39F and the spindle bearing 46 are each held in the bearing box 24. The bearing box 24 has a recess 241 recessed forward from the rear surface of the bearing box 24, and a recess 242 recessed rearward from the front surface of the bearing box 24. The front rotor bearing 39F is disposed in the recess 241. The spindle bearing 46 is disposed in the recess 242. A protrusion 243 of the bearing box 24 is provided radially inward of the recess 242. The spindle bearing 46 is disposed to surround the protrusion 243.

[0104] A peripheral wall portion 81 is provided at the rear end portion of the spindle 8 so as to surround the spindle bearing 46. The spindle bearing 46 supports the peripheral wall portion 81 of the spindle 8.

[0105] The outer diameter of the front rotor bearing 39F is smaller than the inner diameter of the spindle bearing 46. The front rotor bearing 39F and at least a portion of the spindle bearing 46 overlap in the front-rear direction. That is, at least a portion of the front rotor bearing 39F is disposed so as to be inserted inside the spindle bearing 46. This prevents the upper part of the power tool 1 from becoming large in the front-rear direction.

[0106] The spindle bearing 46 has an inner ring 461 and an outer ring 462. The inner ring 461 of the spindle bearing 46 is fixed to the bearing box 24. The outer ring 462 of the spindle bearing 46 is fixed to the spindle 8. The spindle bearing 46 is disposed so as to surround the protruding portion 243 of the bearing box 24. The peripheral wall portion 81 of the spindle 8 is disposed so as to surround the spindle bearing 46. The inner ring 461 is fixed to the outer surface of the protruding portion 243 of the bearing box 24. The outer ring 462 is fixed to the inner surface of the peripheral wall portion 81 of the spindle 8. This prevents the upper part of the power tool 1 from becoming larger in the radial direction.

[0107] A seal member 600 is provided between the internal gear 43 and the bearing box 24. The seal member 600 is ring-shaped. A convex portion that protrudes radially inward is provided on the inside of the seal member 600. The convex portion of the seal member 600 is disposed in a concave portion provided in the internal gear 43. The front end portion of the seal member 600 contacts the hammer case 4. This prevents a decrease in the sealing performance of the boundaries between the internal gear 43, the bearing box 24, and the hammer case 4. In addition, the seal member 600 is prevented from moving forward.

[0108] [Light] FIG. 13 is a cross-sectional view showing a part of the power tool 1 according to the embodiment, and corresponds to an enlarged view of a part of FIG.

[0109] The light 18 includes a first light 18L disposed on the left side of the hammer case 4 and a second light 18R disposed on the right side of the hammer case 4. The first light 18L is disposed on the left side of the anvil 10. The second light 18R is disposed on the right side of the anvil 10.

[0110] In the front-rear direction, the light 18 overlaps at least a portion of the anvil 10. In the front-rear direction, the position of the first light 18L and the position of the second light 18R are equal. In the front-rear direction, each of the first light 18L and the second light 18R overlaps at least a portion of the anvil 10. That is, in the front-rear direction, the position of the light 18 and the position of at least a portion of the anvil 10 are equal.

[0111] Since the light 18 and at least a part of the anvil 10 overlap in the front-rear direction, the upper part of the power tool 1 is prevented from becoming large in the radial direction. The radial dimension of the anvil 10 is smaller than the radial dimension of the hammer 47, for example. In addition, the radial dimension of the front end of the hammer 47 that contacts the anvil 10 is smaller than the radial dimension of the rear end of the hammer 47 that does not contact the anvil 10. Therefore, by overlapping at least a part of the light 18 and the anvil 10 in the front-rear direction, the light 18 can be disposed radially inward from the outer surface of the motor housing 21, for example. Therefore, the upper part of the power tool 1 is prevented from becoming large in the radial direction.

[0112] The light 18 includes a first light 18L disposed on the left side of the anvil 10 (hammer case 4) and a second light 18R disposed on the right side of the anvil 10 (hammer case 4). This prevents the upper part of the power tool 1 from becoming large in the left-right direction.

[0113] In an embodiment, the light 18 overlaps at least a portion of the anvil projection 102 in the front-to-rear direction.

[0114] As a result, the light 18 is disposed at an appropriate position in the front-rear direction. The front of the anvil 10 is properly illuminated by the light 18.

[0115] In addition, the light 18 may overlap at least a portion of the anvil body 101 in the front-rear direction.

[0116] The hammer 47 includes a straight body portion 473 and a reduced diameter portion 474 disposed forward of the straight body portion 473 .

[0117] The straight body portion 473 includes a part of the outer surface of the hammer body 471. The straight body portion 473 is defined between the rear end of the hammer 47 and the rear end of the reduced diameter portion 474 in the front-rear direction. The straight body portion 473 is cylindrical. The outer diameter of the straight body portion 473 is constant in each of a plurality of portions of the straight body portion 473 in the front-rear direction. The outer diameter of the straight body portion 473 refers to the distance between the rotation axis AX and the outer surface of the straight body portion 473 in the radial direction.

[0118] The reduced diameter portion 474 includes a part of the outer surface of the hammer body 471 and the outer surface of the hammer protrusion portion 472. The reduced diameter portion 474 is defined between the front end of the straight body portion 473 and the front end of the hammer 47 in the front-rear direction. The outer diameter of the reduced diameter portion 474 gradually decreases toward the front. The outer diameter of the reduced diameter portion 474 refers to the distance between the rotation axis AX and the outer surface of the reduced diameter portion 474 in the radial direction.

[0119] In the front-rear direction, the reduced diameter portion 474 overlaps the anvil protrusion 102 .

[0120] In the front-rear direction, the dimension Lf of the reduced diameter portion 474 is greater than the dimension Lr of the straight body portion 473.

[0121] In the front-rear direction, the reduced diameter portion 474 and the anvil protrusion 102 overlap each other, thereby preventing the upper part of the power tool 1 from becoming large in the radial direction. In addition, since the dimension Lf of the reduced diameter portion 474 is larger than the dimension Lr of the straight body portion 473, the upper part of the power tool 1 is prevented from becoming large in size.

[0122] An outer surface 474S of the reduced diameter portion 474 and an inner surface 4S of the hammer case 4 are parallel to each other.

[0123] Since the outer surface 474S of the reduced diameter portion 474 and the inner surface 4S of the hammer case 4 are parallel to each other, an increase in size of the upper portion of the power tool 1 is suppressed. Since the outer surface of the hammer case 4 roughly corresponds to the straight body portion 473 and the reduced diameter portion 474, the light 18 is suppressed from protruding in the left-right direction.

[0124] The light 18 is disposed at the front end of the motor accommodating section 21. As shown in Fig. 4 and Fig. 7, the dimension of the front end of the motor accommodating section 21 in the left-right direction is smaller than the dimension of the rear cover 3. The light 18 is disposed so as not to protrude outward beyond the surface of the motor accommodating section 21 in the left-right direction. The light 18 is disposed so as not to protrude outward beyond the surface of the rear cover 3 in the left-right direction.

[0125] In the left-right direction, the dimension of the front end of the motor housing 21 where the light 18 is arranged is smaller than the dimension of the rear cover 3, which prevents the front part of the power tool 1 from becoming large. In addition, each of the left and right outer surfaces of the motor housing 21 extends straight in the front-rear direction, which prevents the upper part of the power tool 1 from becoming large.

[0126] 7, the rear cover 3 supports a rear portion of the rear shaft portion 33R. The rear cover 3 is fixed to the left housing 2L with a left-handed screw 500L, and is fixed to the right housing 2R with a right-handed screw 500R.

[0127] The first light 18L is disposed on the left side of the hammer case 4 that houses the gear and is supported by the left housing 2L. The second light 18R is disposed on the right side of the hammer case 4 that houses the gear and is supported by the right housing 2R.

[0128] The left housing 2L or the rear cover 3 at the location where the left screw 500L is arranged protrudes further left than the left housing 2L at the location where the first light 18L is arranged. The right housing 2R or the rear cover 3 at the location where the right screw 500R is arranged protrudes further right than the right housing 2R at the location where the second light 18R is arranged. In other words, the left-right width of the portion where the light 18 is provided is smaller than the left-right width of the rear cover 3.

[0129] The second light 18R has a right light emitter 181, a right light circuit board 182 on which the right light emitter 181 is mounted, and a right transparent cover 183 disposed in front of the right light emitter 181 and the right light circuit board 182. The right light emitter 181 is disposed to the left of the right end of the right screw 500R.

[0130] A right portion 400R on the outer periphery of the rear portion 4R of the hammer case 4 of the right housing 2R is disposed to the left of the second light 18R.

[0131] [Power tool operation] Next, the operation of the power tool 1 will be described. For example, when performing a screw tightening operation on a workpiece, a tip tool (driver bit) used for the screw tightening operation is inserted into the insertion hole 55 of the anvil 10. The tip tool inserted into the insertion hole 55 is held by the chuck sleeve 11. After the tip tool is attached to the anvil 10, the operator grips the grip portion 22 and operates the trigger switch 14. When the trigger switch 14 is operated, power is supplied from the battery pack 25 to the motor 6, the motor 6 is started, and at the same time, the light 18 is turned on. When the motor 6 is started, the shaft portion 33 of the rotor 27 rotates. When the shaft portion 33 rotates, the rotational force of the shaft portion 33 is transmitted to the planetary gear 42 via the pinion gear 41. The planetary gear 42 revolves around the pinion gear 41 while rotating on its own axis while meshing with the internal teeth of the internal gear 43. The planetary gear 42 is rotatably supported by the spindle 8 via a pin 42P. The revolution of the planetary gear 42 causes the spindle 8 to rotate at a rotational speed lower than the rotational speed of the shaft portion 33.

[0132] When the spindle 8 rotates while the hammer protrusion 472 and the anvil protrusion 102 are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8. As the anvil 10 rotates, the screw tightening operation progresses.

[0133] When a load equal to or greater than a predetermined value acts on the anvil 10 as the screw tightening operation progresses, the rotation of the anvil 10 and the hammer 47 stops. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the hammer 47 moves rearward. As the hammer 47 moves rearward, the hammer protrusion 472 and the anvil protrusion 102 are released from contact with each other. The hammer 47 that has moved rearward moves forward while rotating due to the elastic force of the coil spring 49. As the hammer 47 moves forward while rotating, the anvil 10 is struck in the rotational direction by the hammer 47. This causes the anvil 10 to rotate about the rotation axis AX with high torque. Therefore, the screw is tightened to the workpiece with high torque.

[0134] [effect] As described above, according to the embodiment, the light 18 overlaps at least a part of the anvil 10 in the front-rear direction. Since the light 18 and at least a part of the anvil 10 overlap in the front-rear direction, the upper part of the power tool 1 is prevented from becoming large in the radial direction. The radial dimension of the anvil 10 is smaller than the radial dimension of the hammer 47, for example. In addition, the radial dimension of the front end of the hammer 47 that contacts the anvil 10 is smaller than the radial dimension of the rear end of the hammer 47 that does not contact the anvil 10. Therefore, by overlapping at least a part of the light 18 and the anvil 10 in the front-rear direction, the light 18 can be disposed radially inward from the outer surface of the motor housing 21, for example. That is, the light 18 is prevented from protruding from the side of the motor housing 21. Therefore, the upper part of the power tool 1 is prevented from becoming large in the radial direction.

[0135] The anvil 10 has a rod-shaped anvil body 101 to which a tool tip is attached, and an anvil protrusion 102 that protrudes radially outward from the rear of the anvil body 101. In the front-rear direction, the light 18 overlaps with at least a portion of the anvil protrusion 102. This allows the light 18 to be positioned at an appropriate position in the front-rear direction. The front of the anvil 10 is properly illuminated by the light 18.

[0136] The hammer 47 includes a straight body portion 473 and a reduced diameter portion 474 whose outer diameter decreases toward the front and overlaps with the anvil projection 102 in the front-rear direction. In the front-rear direction, the dimension Lf of the reduced diameter portion 474 is larger than the dimension Lr of the straight body portion 473. The overlap of the reduced diameter portion 474 and the anvil projection 102 in the front-rear direction prevents the upper portion of the power tool 1 from becoming larger in the radial direction. In addition, since the dimension Lf of the reduced diameter portion 474 is larger than the dimension Lr of the straight body portion 473, the upper portion of the power tool 1 is prevented from becoming larger in size.

[0137] The outer surface 474S of the reduced diameter portion 474 is parallel to the inner surface 4S of the hammer case 4. Since the outer surface 474S of the reduced diameter portion 474 is parallel to the inner surface 4S of the hammer case 4, an increase in size of the hammer case 4 is suppressed. As a result, an increase in size of the upper part of the power tool 1 is suppressed.

[0138] The light 18 includes a first light 18L disposed on the left side of the anvil 10 (hammer case 4) and a second light 18R disposed on the right side of the anvil 10 (hammer case 4). This prevents the upper part of the power tool 1 from becoming large in the left-right direction.

[0139] In the left-right direction, the dimension of the front end of the motor housing 21 in which the light 18 is arranged is smaller than the dimension of the rear cover 3. Therefore, the front part of the power tool 1 is prevented from becoming large.

[0140] [Other embodiments] Fig. 14A is a side view showing a modified example of the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 14B is a cross-sectional view taken along line AA in Fig. 14A.

[0141] 14, the fan 12 may be fixed to the front shaft portion 33F. A sensor magnet 35 may be fixed to the rear end surface 32R of the core portion 32.

[0142] Fig. 15A is a side view showing a modified example of the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 15B is a cross-sectional view taken along line AA in Fig. 15A.

[0143] As shown in Fig. 15, a rotor magnet 341 may be disposed inside the core portion 32. In the example shown in Fig. 15, a through hole 320 extending in the front-rear direction is formed in the core portion 32. The through hole 320 is formed so as to connect the front end face 32F and the rear end face 32R. The through hole 320 is formed by drilling the core portion 32. Four through holes 320 are provided at intervals in the circumferential direction. A rotor magnet 341 is disposed in each of the four through holes 320. Also, as shown in Fig. 15, the sensor magnet 35 may be omitted.

[0144] Fig. 16A is a side view showing a modified example of the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 16B is a cross-sectional view taken along line AA in Fig. 16A.

[0145] As shown in Fig. 16, a plurality of rotor magnets 342 may be arranged around the core portion 32. The rotor magnets 342 are fixed to the outer surface of the core portion 32. In a plane perpendicular to the rotation axis AX, the rotor magnet 342 is arc-shaped. Four rotor magnets 342 are provided at intervals in the circumferential direction. In Fig. 16, a sensor magnet 35 is arranged on the front end surface 32F of the core portion 32. The sensor magnet 35 may be omitted.

[0146] Fig. 17A is a side view showing a modified example of the rotor 27, rotor bearing 39, and fan 12 according to the embodiment. Fig. 17B is a cross-sectional view taken along line AA in Fig. 17A.

[0147] As shown in FIG. 17, a cylindrical rotor magnet 34 may be disposed around the core portion 32, and the sensor magnet 35 may be omitted.

[0148] In the above embodiment, the power tool 1 is an impact driver. The power tool 1 is not limited to an impact driver. Examples of the power tool 1 include a driver drill for screwing, an angle drill for drilling, a hammer or hammer drill for striking a drill bit, a grinder for rotating a grindstone, a circular saw for rotating a saw blade, and a reciprocating saw for reciprocating a blade.

[0149] In the above-described embodiment, the power source of the power tool 1 does not have to be the battery pack 25, and may be a commercial power source (AC power source). [Explanation of symbols]

[0150] 1...power tool, 2...housing, 2L...left housing, 2R...right housing, 2S...screw, 3...rear cover, 4...hammer case, 4A...hammer case cover, 4B...bumper, 4F...front, 4R...rear, 4S...inner surface, 5...battery mounting section, 6...motor, 7...reduction mechanism, 8...spindle, 9...impact mechanism, 10...anvil, 11...chuck sleeve, 12...fan, 13...controller, 14...trigger switch, 14A...trigger member, 14B...switch body, 15...forward / reverse switching lever, 16...operation panel, 17...mode switching switch, 18...light, 18L...first Light, 18R...second light, 19...intake port, 20...exhaust port, 21...motor housing, 22...grip section, 23...controller housing, 24...bearing box, 25...battery pack, 26...stator, 27...rotor, 28...stator core, 29...front insulator, 29S...screw, 30...rear insulator, 31...coil, 32...core section, 32F...front end surface, 32R...rear end surface, 33...shaft section, 33F...front shaft section, 33R...rear shaft section, 34...rotor magnet, 35...sensor magnet, 37...sensor board, 37S...rotation detection element, 38...fuse terminal, 39...rotor bearing, 39F...front rotor bearing, 39R...rear rotor bearing, 41...pinion gear, 42...planetary gear, 42P...pin, 43...internal gear, 44...flange portion, 45...rod portion, 46...spindle bearing, 47...hammer, 48...ball, 49...coil spring, 50...spindle groove, 51...hammer groove, 53...recess, 54...washer, 55...insertion hole, 56...anvil bearing, 57...hole, 58...hole, 61...bush, 63...opening, 64...impact force switch, 65...dedicated switch, 92...supply port, 9 4... internal space, 81... peripheral wall portion, 101... anvil body, 102... anvil protrusion portion, 181... right light emitter, 182... right light circuit board, 183... right transparent cover, 241... recess, 242... recess, 243... protrusion, 320... through hole, 330... protrusion, 331... front support portion, 331F... recess, 331R... recess, 332... rear support portion, 333... fan fixing portion, 334F... transition portion, 334R... transition portion, 341... rotor magnet, 342... rotor magnet, 400R... right portion, 461... inner ring, 462... outer ring, 471... hammer body, 472... hammer protrusion portion, 473... straight body portion,474...reduced diameter portion, 474S...outer surface, 500L...left-hand thread, 500R...right-hand thread, 600...sealing member, AX...rotating shaft.

Claims

1. A motor having a stator and a rotor that rotates around a rotation axis extending in the front-rear direction; a motor housing portion that houses at least a portion of the motor; a grip portion protruding downward from the motor housing portion; a spindle having at least a portion disposed forward of the rotor and rotated by the rotor; an anvil having a rod-shaped anvil body to which a tool bit is attached and an anvil protrusion protruding radially outward from a rear portion of the anvil body; a striking mechanism having a hammer disposed around the spindle and a ball disposed between the spindle and the hammer, the striking mechanism striking the anvil protrusion in a rotational direction with the hammer based on rotation of the spindle; a hammer case connected to a front portion of the motor housing portion and housing the impact mechanism; A first light is disposed on the left side of the hammer case and a second light is disposed on the right side of the hammer case, the first light illuminating the front of the anvil, In the front-rear direction, each of the first light and the second light overlaps at least a portion of the anvil protrusion, Each of the first light and the second light has a light emitter, a light circuit board on which the light emitter is mounted, and a transparent cover arranged in front of the light emitter and the light circuit board, Each of the first light and the second light is disposed in a recess recessed rearward from a front end portion of the motor housing portion, and front ends of the first light and the second light are disposed forward of a front end portion of the hammer. Power tools.

2. The hammer includes a straight body portion and a reduced diameter portion whose outer diameter decreases toward the front and overlaps with the anvil protrusion portion in the front-rear direction, In the front-rear direction, the dimension of the reduced diameter portion is larger than the dimension of the straight body portion. The power tool according to claim 1.

3. The outer surface of the reduced diameter portion and the inner surface of the hammer case are parallel to each other. The power tool according to claim 2.

4. a rear cover for covering an opening at a rear end of the motor housing portion, The first light and the second light are held at a front end portion of the motor housing portion, In the left-right direction, a dimension of a front end portion of the motor accommodating portion is smaller than a dimension of the rear cover. The power tool according to claim 1.

5. A motor having a stator and a rotor that rotates around a rotation axis extending in the front-rear direction; a motor housing portion that houses at least a portion of the motor; a grip portion protruding downward from the motor housing portion; a spindle having at least a portion disposed forward of the rotor and rotated by the rotor; an anvil having a rod-shaped anvil body to which a tip tool is attached and an anvil protrusion protruding radially outward from a rear portion of the anvil body; a striking mechanism having a hammer disposed around the spindle and a ball disposed between the spindle and the hammer, the striking mechanism striking the anvil protrusion in a rotational direction with the hammer based on rotation of the spindle; a hammer case connected to a front portion of the motor housing portion and housing the impact mechanism; A first light is disposed on the left side of the hammer case and a second light is disposed on the right side of the hammer case, the first light illuminating the front of the anvil, In the front-rear direction, each of the first light and the second light overlaps at least a portion of the anvil protrusion, The hammer includes a straight body portion and a reduced diameter portion whose outer diameter decreases toward the front and overlaps with the anvil protrusion portion in the front-rear direction, In the front-rear direction, a dimension of a portion of the reduced diameter portion where an outer surface of the reduced diameter portion and an inner surface of the hammer case are parallel to each other is larger than a dimension of the straight body portion, The ball and the reduced diameter portion overlap in the front-rear direction. Power tools.

6. a brushless motor including a stator having a stator core and a coil, and a rotor rotatable on the inner periphery side of the stator and having a rotor core, a magnet, and a rotor shaft; A gear driven by the rotor; a spindle, at least a portion of which is disposed forward of the rotor and which is rotated by the gear; an anvil having a rod-shaped anvil body to which a tool bit is attached and an anvil protrusion protruding radially outward from a rear portion of the anvil body; a striking mechanism having a hammer disposed around the spindle and a ball disposed between the spindle and the hammer, the striking mechanism striking the anvil protrusion in a rotational direction with the hammer based on rotation of the spindle; a hammer case that houses the gear and the impact mechanism and from which the spindle protrudes; a left housing that supports a left outer circumferential side of the stator and covers at least a portion of a left portion of the hammer case; a right housing that supports a right outer circumferential side of the stator and covers at least a part of a right portion of the hammer case; a grip housing extending downward from the left housing and the right housing; a rear cover that supports a rear portion of the rotor shaft and is fixed to the left housing with a left-handed screw and is fixed to the right housing with a right-handed screw; a left light disposed on the left side of the hammer case and supported by the left housing; a right light disposed on a right side of the hammer case and supported by the right housing; a pair of anvil bearings that are held by the hammer case, rotatably support the anvil body, and are formed of ball bearings arranged in the front-rear direction; The left housing or the rear cover at a location where the left screw is arranged protrudes leftward beyond the left housing at a location where the left light is arranged, The right housing or the rear cover at a location where the right screw is arranged protrudes to the right side beyond the right housing at a location where the right light is arranged, The left light and the right light are disposed rearward of the pair of anvil bearings, and front ends of the left light and the right light are disposed forward of a front end of the hammer. Power tools.

7. The right light includes a right light emitter, a right light circuit board on which the right light emitter is mounted, and a right transparent cover disposed in front of the right light emitter and the right light circuit board, The right light emitter is disposed to the left of the right end of the right screw. The power tool according to claim 6.

8. A right portion of the outer periphery of the hammer case of the right housing is disposed to the left of the right light. The power tool according to claim 6.

9. A fan is fixed to the rotor shaft, The fan is disposed on an inner circumferential side of the rear cover, The fan is configured to have a smaller diameter than the stator core. The power tool according to claim 6.

10. The outer surface of the rear cover has a gradually smaller diameter from the front to the rear. The power tool according to claim 7.

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