power tools

Abstract

To properly illuminate an object to be worked by an electric tool.SOLUTION: An electric tool 1 comprises: a motor; an output part 10 that is rotated around a rotation axis by the motor; a plurality of lights arranged with an interval around the output part; and an optical member having a refracting surface that refracts illuminating light emitted from light-emitting surfaces of the lights to outside in a radial direction of the rotation axis. Further, the electric tool may comprise a circuit board having a support surface for supporting the lights. A cover member may be arranged closer to a front side than at least a portion of the circuit board. The cover member may be formed of a material different from that if the optical member. The cover member may be formed integrally with the optical member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a power tool. [Background technology]

[0002] BACKGROUND ART In the technical field of power tools, a power tool equipped with an LED, such as that disclosed in Patent Document 1, is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5146717 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to properly illuminate a work target of a power tool. [Means for solving the problem]

[0005] This specification discloses a power tool. The power tool may include a motor, an output unit that rotates about a rotation axis by the motor, and a plurality of lights arranged at intervals around the output unit. The power tool may also include an optical member having a refractive surface that refracts illumination light emitted from a light-emitting surface of the light toward an outer side in a radial direction of the rotation axis.

[0006] The power tool may also include a motor, an output unit that rotates around a rotation axis by the motor, and a plurality of lights arranged at intervals around the output unit. The power tool may also include a circuit board having a support surface that supports the lights. The power tool may also include an optical member that is arranged to face the light-emitting surface of the lights. The power tool may also include a cover member located in front of at least a portion of the circuit board. The cover member may be made of a material different from the optical member. The cover member may be molded integrally with the optical member.

[0007] The power tool may also include a motor, an output unit that rotates around a rotation axis by the motor, and a plurality of lights arranged at intervals around the output unit. The power tool may also include a circuit board having a support surface that supports the lights. The power tool may also include an optical member arranged to face the light-emitting surface of the lights. The power tool may also include a cover member arranged forward of at least a portion of the circuit board. The power tool may be formed from the same material as the optical member. The cover member may be molded integrally with the optical member. The power tool may also include a colored layer provided on at least one of a rear surface of the cover member and a front surface of the cover member. [Effects of the Invention]

[0008] According to the above configuration, the object to be worked on by the power tool is properly illuminated. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a power tool according to an embodiment. [Figure 2] FIG. 2 is a side view showing the upper part of the power tool according to the embodiment. [Figure 3] FIG. 3 is a plan view showing the upper part of the power tool according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the upper part of the power tool according to the embodiment. [Figure 5] FIG. 5 is a perspective view showing an upper portion of the power tool according to the embodiment. [Figure 6] FIG. 6 is an exploded perspective view showing an upper portion of the power tool according to the embodiment. [Figure 7] FIG. 7 is a front view showing the upper part of the power tool according to the embodiment. [Figure 8] FIG. 8 is a cross-sectional view taken along the line AA in FIG. [Figure 9] 9 is a cross-sectional view taken along the line BB in FIG. [Figure 10] FIG. 10 is a perspective view showing the light unit according to the embodiment, as seen from the front. [Figure 11] FIG. 11 is a perspective view showing the light unit according to the embodiment, seen from behind. [Figure 12] FIG. 12 is an exploded perspective view from the front showing the light unit according to the embodiment. [Figure 13] FIG. 13 is an exploded perspective view showing the light unit according to the embodiment, as seen from behind. [Figure 14] FIG. 14 is an exploded perspective view from the front showing the circuit board, optical member, and cover member according to the embodiment. [Figure 15] FIG. 15 is an exploded perspective view from the rear showing the circuit board, optical member, and cover member according to the embodiment. [Figure 16] FIG. 16 is a front view of the optical member according to the embodiment. [Figure 17] FIG. 17 is a rear view of the optical member according to the embodiment. [Figure 18] FIG. 18 is a front perspective view showing a light transmitting portion of the optical member according to the embodiment. [Figure 19] FIG. 19 is a perspective view from behind showing the light transmitting portion of the optical member according to the embodiment. [Figure 20] FIG. 20 is a cross-sectional view taken along the line CC in FIG. [Figure 21] FIG. 21 is a cross-sectional view taken along the line DD in FIG. [Figure 22] FIG. 22 is a cross-sectional view taken along the line EE in FIG. [Figure 23] FIG. 23 is an exploded perspective view showing the power tool according to the embodiment. [Figure 24] FIG. 24 is a schematic diagram showing a light unit according to a comparative example. [Figure 25] FIG. 25 is a schematic diagram showing a light unit according to an embodiment. [Figure 26] FIG. 26 is a schematic diagram showing a light unit according to a comparative example. [Figure 27] FIG. 27 is a schematic diagram showing a light unit according to an embodiment. [Figure 28]FIG. 28 is a schematic diagram showing the illumination range of the illumination light according to the embodiment. [Figure 29] FIG. 29 is a perspective view showing a light unit according to an embodiment. [Figure 30] FIG. 30 is a perspective view showing a light unit according to an embodiment. [Figure 31] FIG. 31 is a cross-sectional view schematically showing a light unit according to an embodiment. [Figure 32] FIG. 32 is a diagram schematically showing a method for manufacturing a cover member according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] In one or more embodiments, a power tool may include a motor, an output unit that is rotated about a rotation axis by the motor, and a plurality of lights that are spaced apart around the periphery of the output unit. The power tool may also include an optical member having a refractive surface that refracts illumination light emitted from a light-emitting surface of the light radially outward from the rotation axis.

[0011] In the above configuration, the illumination light emitted from the light is refracted by the refractive surface of the optical element and travels radially outward from the rotation axis. This reduces the overlapping area of ​​the illumination light emitted from the first light and the illumination light emitted from the second light on the surface of the work object of the power tool. Furthermore, when the tool bit is attached to the output unit, the illumination light emitted from the light is less likely to be irradiated onto the tool bit, thereby preventing the shadow of the tool bit from being cast on the surface of the work object. This ensures that the work object of the power tool is properly illuminated.

[0012] In one or more embodiments, the optical element may have an incident surface onto which illumination light emitted from the light enters and an exit surface from which the illumination light exits. The incident surface may include a refractive surface.

[0013] In the above configuration, the incident surface including the refractive surface is prevented from being exposed, and therefore damage to the refractive surface is prevented.

[0014] In one or more embodiments, the input surface may face the output surface.

[0015] In the above configuration, since no other optical element is disposed between the light-emitting surface of the light and the incident surface of the optical element, the size and complexity of the structure of the optical system through which the illumination light emitted from the light passes is prevented from increasing.

[0016] In one or more embodiments, the refractive surface may be angled radially outward toward the light.

[0017] In the above configuration, the illumination light emitted from the light-emitting surface of the light can be refracted at the refractive surface to the outside in the radial direction of the rotation axis.

[0018] In one or more embodiments, the refractive surface may include a first refractive surface that refracts the illumination light in a first direction and a second refractive surface that refracts the illumination light in a second direction.

[0019] In the above configuration, the illumination light emitted from the light-emitting surface of the light is refracted in multiple directions, so that the illumination range of the illumination light is expanded on the surface of the work target of the power tool.

[0020] In one or more embodiments, the power tool may include a circuit board having a support surface that supports the light.

[0021] In the above configuration, the light can emit illumination light while being supported on the support surface of the circuit board.

[0022] In one or more embodiments, the axis of rotation and the normal to the light emitting surface may be parallel.

[0023] In the above configuration, the illumination light emitted from the light-emitting surface of the light travels parallel to the rotation axis, and then can be refracted radially outward from the rotation axis by the optical member.

[0024] In one or more embodiments, the optical element may be fixed to the circuit board.

[0025] In the above configuration, the optical member is fixed to the circuit board, so that changes in the relative positions of the light, the optical member, and the circuit board are suppressed.

[0026] In one or more embodiments, the power tool may include a cover member that is positioned forward of at least a portion of the circuit board, is made of a material different from the optical member, and is integrally molded with the optical member.

[0027] In the above configuration, the circuit board is protected by the cover member, and the protection of the circuit board allows the light to operate properly, thereby properly illuminating the work target of the power tool.

[0028] In one or more embodiments, a power tool may include a motor, an output unit that is rotated about a rotation axis by the motor, and a plurality of lights spaced apart around the periphery of the output unit. The power tool may include a circuit board having a support surface that supports the lights. The power tool may include an optical member that is positioned to face the light-emitting surface of the light. The power tool may include a cover member that is positioned forward of at least a portion of the circuit board. The cover member may be made of a different material from the optical member. The cover member may be integrally molded with the optical member.

[0029] In the above configuration, the light is protected by the optical member, and the circuit board is protected by the cover member. Protecting the light reduces damage to the light. Protecting the circuit board allows the light to operate properly. Because the cover member is made of a different material from the optical member, the circuit board is properly protected. Furthermore, because the optical member and the cover member are integrally molded, changes in the relative positions of the optical member and the cover member are reduced. Therefore, the work target of the power tool is properly illuminated.

[0030] In one or more embodiments, the optical member and the cover member may be secured to the circuit board.

[0031] In the above configuration, the optical member and the cover member are each fixed to the circuit board, so that changes in the relative positions of the light, optical member, and circuit board are suppressed.

[0032] In one or more embodiments, the optical member may include a light-transmitting portion through which the illumination light emitted from the light-emitting surface passes. The cover member may include a light-blocking portion.

[0033] In the above configuration, the illumination light emitted from the light-emitting surface of the light passes through the light-transmitting portion and is irradiated onto the work target of the power tool. The light-shielding portion makes it difficult to see the circuit board from outside the cover member, improving the aesthetic appearance of the power tool. In addition, external light is prevented from irradiating the circuit board.

[0034] In one or more embodiments, the optical member may be made of a synthetic resin, and the cover member may be made of a synthetic resin having a coloring material dispersed therein.

[0035] In the above-described configuration, the optical member is made of a light-transmitting synthetic resin, and the cover member is formed by dispersing a coloring material in the synthetic resin that constitutes the optical member.

[0036] In one or more embodiments, the power tool may include a motor, an output unit that rotates around a rotation axis by the motor, and a plurality of lights spaced apart around the output unit. The power tool may include a circuit board having a support surface that supports the lights. The power tool may include an optical member that is positioned to face the light-emitting surface of the light. The power tool may include a cover member that is positioned forward of at least a portion of the circuit board. The cover member may be made of the same material as the optical member. The cover member may be integrally molded with the optical member. The power tool may include a colored layer that is provided on at least one of a rear surface and a front surface of the cover member.

[0037] In the above configuration, the light is protected by the optical member, and the circuit board is protected by the cover member. Protecting the light reduces damage to the light. Protecting the circuit board allows the light to operate properly. Furthermore, since the optical member and the cover member are integrally molded, changes in the relative positions of the optical member and the cover member are reduced. Therefore, the work target of the power tool is properly illuminated. Furthermore, the colored layer provided on at least one of the rear surface and the front surface of the cover member makes it difficult to see the circuit board from outside the cover member, improving the aesthetic appeal of the power tool. Furthermore, external light is reduced from irradiating the circuit board.

[0038] In one or more embodiments, the power tool may include an adhesive layer disposed between the cover member and the color layer.

[0039] In the above-described configuration, the cover member and the colored layer are fixed together via the adhesive layer.

[0040] In one or more embodiments, the power tool may include a protective layer covering the color layer.

[0041] In the above-described configuration, the colored layer is protected by the protective layer, which prevents the colored layer from peeling off, for example.

[0042] In one or more embodiments, the power tool may include a transmission mechanism that transmits rotational force of the motor to the output part, and a case that accommodates at least a portion of the transmission mechanism and the output part. The optical member and the cover member may be supported by the case.

[0043] In the above configuration, changes in the relative positions of the optical member and the cover member with respect to the case are suppressed.

[0044] In one or more embodiments, the case may have a first cylindrical portion disposed around the transmission mechanism, and a second cylindrical portion disposed forward of the first cylindrical portion and having an outer diameter smaller than that of the first cylindrical portion. The optical member and the cover member may be disposed around the second cylindrical portion.

[0045] In the above configuration, the optical member and the cover member are arranged around the small-diameter second cylindrical portion, thereby preventing the power tool from becoming too large. In particular, the first cylindrical portion is prevented from becoming too large (larger in diameter). Since the first cylindrical portion is prevented from becoming too large (larger in diameter), the workability of using the power tool is improved.

[0046] In one or more embodiments, the second cylindrical portion may have a corner portion that protrudes radially outward, and the optical member and the cover member may have a recess in which the corner portion is disposed.

[0047] With the above configuration, the optical member and the cover member are properly aligned with the second cylindrical portion, and relative rotation between the optical member and the cover member and the second cylindrical portion is suppressed.

[0048] In one or more embodiments, the power tool may include a fixing member supported on the second barrel portion and in contact with at least a portion of the front surface of the cover member.

[0049] In the above configuration, the fixing member prevents the cover member from slipping out forward from the second cylindrical portion, and also prevents the cover member and the second cylindrical portion from moving relative to each other in the front-rear direction.

[0050] [First embodiment] A first embodiment will be described with reference to the drawings. In this 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. The power tool 1 has a motor 6 as a power source.

[0051] In the embodiment, the direction parallel to the rotation axis AX of the motor 6 is referred to as the axial direction, the direction circumferentially 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.

[0052] The rotation axis AX extends in the front-to-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 will be referred to as the radially inner side, and a position farther from or away from the rotation axis AX will be referred to as the radially outer side. In addition, in the circumferential direction, a specified forward rotation direction will be referred to as the one circumferential side, and a reverse rotation direction will be referred to as the other circumferential side.

[0053] <Power tools> Fig. 1 is a perspective view showing a power tool 1 according to an embodiment. Fig. 2 is a side view showing an upper part of the power tool 1 according to an embodiment. Fig. 3 is a plan view showing an upper part of the power tool 1 according to an embodiment. Fig. 4 is a cross-sectional view showing an upper part of the power tool 1 according to an embodiment.

[0054] 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 hammer case cover 5, a motor 6, a reduction gear mechanism 7, a spindle 8, a striking mechanism 9, an anvil 10, a bit sleeve 11, a fan 12, a battery mounting portion 13, a trigger switch 14, a forward / reverse rotation switch lever 15, an operation panel 16, a hand mode switch button 17, and a light unit 18.

[0055] 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 located to the right of the left housing 2L. The left housing 2L and the right housing 2R are fixed together with a plurality of screws 2S. The housing 2 is made up of a pair of split housing halves.

[0056] The housing 2 has a motor accommodating portion 21, a grip portion 22, and a battery connecting portion 23.

[0057] The motor accommodating portion 21 is cylindrical and accommodates the motor 6 therein.

[0058] The grip portion 22 protrudes downward from the motor housing portion 21. The trigger switch 14 is provided on the upper portion of the grip portion 22. The grip portion 22 is held by an operator.

[0059] The battery connector 23 is connected to the lower end of the grip 22. The outer dimensions of the battery connector 23 are larger than the outer dimensions of the grip 22 in both the front-rear and left-right directions.

[0060] The rear cover 3 is made of synthetic resin. The rear cover 3 is disposed behind 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 the opening at the rear end of the motor housing portion 21.

[0061] The motor accommodating section 21 has an air intake port 19. The rear cover 3 has an air exhaust port 20. Air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 19. Air from the internal space of the housing 2 flows out to the external space of the housing 2 through the air exhaust port 20.

[0062] The hammer case 4 is made of metal. In this embodiment, the hammer case 4 is made of aluminum. The hammer case 4 is cylindrical. The hammer case 4 is connected to the front of the motor accommodating section 21. The bearing box 24 is held and fixed to the rear of the hammer case 4. A screw thread is formed on the outer periphery of the bearing box 24. A screw groove is formed on the inner periphery of the hammer case 4. The screw thread of the bearing box 24 and the screw groove of the hammer case 4 are coupled together, thereby fixing the bearing box 24 and the hammer case 4. The hammer case 4 is sandwiched between the left housing 2L and the right housing 2R. A part of the bearing box 24 and the rear of the hammer case 4 are housed in the motor accommodating section 21. The bearing box 24 is fixed to both the motor accommodating section 21 and the hammer case 4.

[0063] The hammer case 4 houses at least a portion of the reduction mechanism 7, the spindle 8, the striking mechanism 9, and the anvil 10. At least a portion of the reduction mechanism 7 is disposed inside the bearing box 24. The reduction mechanism 7 includes a plurality of gears.

[0064] The hammer case cover 5 covers at least a portion of the surface of the hammer case 4. The hammer case cover 5 is made of synthetic resin. In this embodiment, the hammer case cover 5 is made of polycarbonate resin. The hammer case cover 5 protects the hammer case 4. The hammer case cover 5 prevents contact between the hammer case 4 and objects around the power tool 1. The hammer case cover 5 prevents contact between the hammer case 4 and an operator.

[0065] The motor 6 is a power source for 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. The stator 26 is supported and fixed to the motor housing portion 21. 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 around a rotation axis AX extending in the front-rear direction.

[0066] The stator 26 includes a stator core 28 , a front insulator 29 , a rear insulator 30 , and a coil 31 .

[0067] 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.

[0068] The front insulator 29 is provided in the front portion of the stator core 28. The rear insulator 30 is provided in the rear portion 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 arranged so as to cover part of the surface of the teeth. The rear insulator 30 is arranged so as to cover part of the surface of the teeth.

[0069] 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 plurality of coils 31 are connected to lead wires for supplying power from the battery pack 25 via fusing terminals 38.

[0070] The rotor 27 rotates about a rotation axis AX and includes a rotor core 32, a rotor shaft 33, a rotor magnet 34, and a sensor magnet 35.

[0071] The rotor core 32 and the rotor shaft 33 are both made of steel. The front portion of the rotor shaft 33 protrudes forward from the front end surface of the rotor core 32. The rear portion of the rotor shaft 33 protrudes rearward from the rear end surface of the rotor core 32.

[0072] The rotor magnet 34 is fixed to the rotor core 32. The rotor magnet 34 is cylindrical. The rotor magnet 34 is arranged around the rotor core 32.

[0073] The sensor magnet 35 is fixed to the rotor core 32. The sensor magnet 35 has an annular shape. The sensor magnet 35 is disposed on the front end surface of the rotor core 32 and the front end surface of the rotor magnet 34.

[0074] 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 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.

[0075] The rotor shaft 33 is rotatably supported by rotor bearings 39. The rotor bearings 39 include a front rotor bearing 39F that rotatably supports the front portion of the rotor shaft 33, and a rear rotor bearing 39R that rotatably supports the rear portion of the rotor shaft 33.

[0076] The front rotor bearing 39F is held in the bearing box 24. The bearing box 24 has a recess 24A recessed forward from the rear surface of the bearing box 24. The front rotor bearing 39F is disposed in the recess 24A. The rear rotor bearing 39R is held in the rear cover 3. The front end of the rotor shaft 33 is disposed in the internal space of the hammer case 4 through an opening in the bearing box 24.

[0077] A pinion gear 41 is formed on the front end of the rotor shaft 33. The pinion gear 41 is connected to at least a part of the reduction mechanism 7. The rotor shaft 33 is connected to the reduction mechanism 7 via the pinion gear 41.

[0078] The reduction mechanism 7 is disposed forward of the motor 6. The reduction mechanism 7 connects the rotor shaft 33 and the spindle 8. The reduction mechanism 7 transmits the rotational force of the motor 6 to the spindle 8. The reduction mechanism 7 rotates the spindle 8 at a rotational speed lower than the rotational speed of the rotor shaft 33. The reduction mechanism 7 includes a planetary gear mechanism.

[0079] The reduction mechanism 7 has a plurality of gears. The gears of the reduction mechanism 7 are driven by a rotor 27.

[0080] The reduction mechanism 7 has a plurality of planetary gears 42 arranged around a 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 housed in the hammer case 4 and the bearing box 24, respectively. Each of the plurality of planetary gears 42 meshes with the pinion gear 41. The planetary gear 42 is rotatably supported on 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 relative to the bearing box 24.

[0081] When the rotor shaft 33 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 rotor shaft 33.

[0082] 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 forward of the reduction mechanism 7. The spindle 8 is rotated by the rotor 27. The spindle 8 is rotated by the rotational force of the motor 6 transmitted by the reduction mechanism 7.

[0083] The spindle 8 has a flange portion 8A and a spindle shaft portion 8B that protrudes forward from the flange portion 8A. The planetary gear 42 is rotatably supported on the flange portion 8A via a pin 42P. The rotation axis of the spindle 8 coincides with the rotation axis AX of the motor 6. The spindle 8 rotates around the rotation axis AX. The spindle 8 is rotatably supported by a spindle bearing 44. A peripheral wall portion 8C is provided at the rear end of the spindle 8. The peripheral wall portion 8C is provided so as to surround the spindle bearing 44. The spindle bearing 44 supports the peripheral wall portion 8C.

[0084] The bearing box 24 is disposed around at least a portion of the periphery of the spindle 8. The spindle bearing 44 is held in the bearing box 24. The bearing box 24 has a recess 24B recessed rearward from the front surface of the bearing box 24. The spindle bearing 44 is disposed in the recess 24B.

[0085] The striking mechanism 9 is driven by a motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via a reduction mechanism 7 and a spindle 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the spindle 8 rotated by the motor 6. 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 a hammer case 4.

[0086] 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.

[0087] The hammer 47 is cylindrical. The hammer 47 is disposed around the spindle shaft portion 8B. The hammer 47 has a hole 47A in which the spindle shaft portion 8B is disposed.

[0088] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the reduction mechanism 7 and the spindle 8. The hammer 47 can rotate together with the spindle 8 based on the rotational force of the spindle 8 rotated by the motor 6. 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.

[0089] The ball 48 is made of a metal such as steel. The ball 48 is disposed between the spindle shaft portion 8B and the hammer 47. The spindle 8 has a spindle groove 8D in which at least a portion of the ball 48 is disposed. The spindle groove 8D is provided on a portion of the outer surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47B in which at least a portion of the ball 48 is disposed. The hammer groove 47B is provided on a portion of the inner surface of the hammer 47. The ball 48 is disposed between the spindle groove 8D and the hammer groove 47B. The ball 48 can roll inside the spindle groove 8D and inside the hammer groove 47B. The hammer 47 is movable along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial and rotational directions within a movable range defined by the spindle groove 8D and the hammer groove 47B.

[0090] The coil spring 49 generates an elastic force that moves the hammer 47 forward. The coil spring 49 is disposed between the flange portion 8A and the hammer 47. A ring-shaped recess 47C is provided on the rear surface of the hammer 47. The recess 47C is recessed forward from the rear surface of the hammer 47. A washer 45 is provided inside the recess 47C. The rear end of the coil spring 49 is supported by the flange portion 8A. The front end of the coil spring 49 is disposed inside the recess 47C and supported by the washer 45.

[0091] The anvil 10 is an output part of the power tool 1 that is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the anvil 10 via a reduction mechanism 7 and a spindle 8. The reduction mechanism 7 and the spindle 8 function as a transmission mechanism that transmits the rotational force of the motor 6 to the anvil 10.

[0092] The anvil 10 is rotatably supported by a bearing 46. 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 all coincident. The anvil 10 is rotated around the rotation axis AX by the motor 6. The bearing 46 is held by the hammer case 4. In this embodiment, two bearings 46 are arranged in the front-to-rear direction. An example of the bearing 46 is a ball bearing.

[0093] At least a portion of the anvil 10 is positioned forward of the hammer 47. The anvil 10 has a tool hole 10A into which a tool bit is inserted. The tool hole 10A 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 spindle protrusion 10B connected to the front end of the spindle shaft portion 8B. The spindle protrusion 10B is provided at the rear end of the anvil 10. The spindle protrusion 10B is inserted into a recess provided at the front end of the spindle shaft portion 8B.

[0094] The anvil 10 has a rod-shaped anvil body 101 and an anvil protrusion 102. The tool hole 10A is provided at the front end of the anvil body 101. A tool bit is attached to the anvil body 101. The anvil protrusion 102 is provided at the rear end of the anvil 10. The anvil protrusion 102 protrudes radially outward from the rear end of the anvil body 101.

[0095] At least a portion of the hammer 47 is capable of contacting the anvil protrusion 102. A hammer protrusion that protrudes forward is provided at the front of the hammer 47. The hammer protrusion of the hammer 47 and the anvil protrusion 102 are capable of contacting each other. When the motor 6 is driven while the hammer 47 and the anvil protrusion 102 are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0096] The anvil 10 is struck in the rotational direction by the hammer 47. For example, during a screw tightening operation, if the load acting on the anvil 10 becomes too high, a situation may arise in which the anvil 10 cannot be rotated by the rotational force generated by the motor 6 alone. When the rotational force generated by the motor 6 alone is no longer sufficient to rotate the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are capable of relative movement in the axial and circumferential directions via the ball 48. Even after the rotation of the hammer 47 stops, the rotation of the spindle 8 continues due to the rotational force generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the ball 48 moves rearward while being guided by the spindle groove 8D and the hammer groove 47B. The hammer 47 receives force from the ball 48 and moves rearward along with the ball 48. In other words, the hammer 47 moves rearward due to 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 47 and the anvil protrusion 102 is released.

[0097] The coil spring 49 generates an elastic force that moves the hammer 47 forward. After moving backward, the hammer 47 moves forward due to the elastic force of the coil spring 49. As the hammer 47 moves forward, it receives a rotational force from the ball 48. That is, the hammer 47 moves forward while rotating. As the hammer 47 moves forward while rotating, it 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 47. Both the rotational force of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. Therefore, the anvil 10 can rotate around the rotation axis AX with high torque.

[0098] The bit sleeve 11 is disposed around the front portion of the anvil 10. The bit sleeve 11 holds the tool bit inserted into the tool hole 10A.

[0099] The fan 12 is disposed rearward of the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the rear of the rotor shaft 33 via a bushing 12A. The fan 12 is disposed between the rear rotor bearing 39R and the stator 26. The fan 12 rotates with the rotation of the rotor 27. As the rotor shaft 33 rotates, the fan 12 rotates together with the rotor shaft 33. As the fan 12 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake 19. The air that has flowed into the internal space of the housing 2 circulates through the internal space of the housing 2, thereby cooling the motor 6. As the fan 12 rotates, the air that has circulated through the internal space of the housing 2 flows out into the external space of the housing 2 through the air exhaust 20.

[0100] The battery mounting portion 13 is disposed below the battery connect portion 23. The battery mounting portion 13 is connected to the battery pack 25. The battery pack 25 is mounted to the battery mounting portion 13. The battery pack 25 is detachable from the battery mounting portion 13. 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 portion 13, 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.

[0101] 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. By operating the trigger switch 14, the motor 6 is switched between being driven and being stopped.

[0102] 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.

[0103] The operation panel 16 is provided in the battery connector 23. The operation panel 16 is operated by an operator to switch the control mode of the motor 6. The operation panel 16 has an impact force switch 16A and a dedicated switch 16B. The impact force switch 16A and the dedicated switch 16B are each operated by an operator. The control mode of the motor 6 is switched by operating at least one of the impact force switch 16A and the dedicated switch 16B.

[0104] The hand mode switching button 17 is provided above the trigger switch 14. The hand mode switching button 17 is operated by an operator. By operating the hand mode switching button 17, the control mode of the motor 6 is switched.

[0105] <Light unit> Fig. 5 is a perspective view showing the upper part of the power tool 1 according to the embodiment. Fig. 6 is an exploded perspective view showing the upper part of the power tool 1 according to the embodiment. Fig. 7 is a front view showing the upper part of the power tool 1 according to the embodiment. Fig. 8 is a cross-sectional view taken along line AA in Fig. 7. Fig. 9 is a cross-sectional view taken along line BB in Fig. 7.

[0106] The power tool 1 includes a light unit 18, a fixing member 50, and a buffer member 51.

[0107] The light unit 18 emits illumination light. The light unit 18 illuminates the periphery of the anvil 10 with the illumination light. The light unit 18 illuminates the area in front of the anvil 10 with the illumination light. The light unit 18 illuminates the tool bit attached to the anvil 10 and the area around the tool bit with the illumination light. The light unit 18 illuminates the work target of the power tool 1 with the illumination light.

[0108] The light unit 18 is directly or indirectly supported on the hammer case 4. The light unit 18 is disposed in the front part of the hammer case 4. The light unit 18 is disposed around at least a part of the periphery of the hammer case 4.

[0109] The hammer case 4 has a hammer accommodating portion 401 which is a first cylindrical portion, and a bearing support portion 402 which is a second cylindrical portion. The hammer accommodating portion 401 is cylindrical. The hammer accommodating portion 401 is arranged around the spindle 8 and the striking mechanism 9. The hammer accommodating portion 401 accommodates at least the spindle shaft portion 8B and the hammer 47. The bearing support portion 402 is cylindrical. The bearing support portion 402 is arranged forward of the hammer accommodating portion 401. The outer diameter of the bearing support portion 402 is smaller than the outer diameter of the hammer accommodating portion 401. The bearing support portion 402 is arranged around the bearing 46. The bearing support portion 402 supports the bearing 46. A tip portion 405 of the bearing support portion 402 is arranged around the rear portion of the bit sleeve 11.

[0110] The light unit 18 is disposed around the bearing support portion 402. The hammer case cover 5 covers at least a portion of the outer surface of the hammer accommodating portion 401. The rear portion of the hammer accommodating portion 401 is accommodated in the motor accommodating portion 21 of the housing 2.

[0111] Fig. 10 is a perspective view from the front showing the light unit 18 according to the embodiment. Fig. 11 is a perspective view from the rear showing the light unit 18 according to the embodiment. Fig. 12 is an exploded perspective view from the front showing the light unit 18 according to the embodiment. Fig. 13 is an exploded perspective view from the rear showing the light unit 18 according to the embodiment.

[0112] The light unit 18 includes a light 60, a circuit board 70, an optical member 80, a cover member 90, and an adhesive resin portion 55.

[0113] The light 60 is a light source that emits illumination light. The light 60 includes a light emitting diode (LED). The light 60 has a light emitting surface 61 that emits the illumination light. The light emitting surface 61 faces forward. The front surface of the light 60 includes the light emitting surface 61.

[0114] A plurality of lights 60 are arranged at intervals around the periphery of the anvil 10. In this embodiment, four lights 60 are arranged around the periphery of the anvil 10.

[0115] The circuit board 70 supports the light 60. The circuit board 70 includes a printed circuit board (PCB). The circuit board 70 has wiring connected to the light 60. Power is supplied to the light 60 via the wiring of the circuit board 70.

[0116] The circuit board 70 has a support surface 71 that supports the lights 60. The support surface 71 faces forward. The front surface of the circuit board 70 includes the support surface 71. A plurality of lights 60 are supported on the support surface 71 of the circuit board 70.

[0117] The circuit board 70 is disposed around at least a portion of the periphery of the hammer case 4. In the embodiment, the circuit board 70 is disposed around a portion of the periphery of the hammer case 4. The circuit board 70 is disposed around a portion of the periphery of the bearing support portion 402.

[0118] The light 60 is mounted on a support surface 71 of the circuit board 70. In the embodiment, the light unit 18 includes a surface mount device (SMD) light emitting diode. The light 60 includes a so-called chip LED.

[0119] The outer shape of the light 60 is substantially rectangular. As shown in Fig. 12, the length L of the light 60 is 1.1 mm or more and 10.0 mm or less, the width W of the light 60 is 1.1 mm or more and 10.0 mm or less, and the height H of the light 60 is 0.27 mm or more and 5.0 mm or less. For example, a light 60 having a length of 3.0 mm, a width of 1.4 mm, and a height of 0.5 mm may be used.

[0120] The brightness of the illumination light emitted from the light-emitting surface 61 of the light 60 is 5 lm or more and 4000 lm or less. The brightness of the illumination light may be, for example, 5 lm or more and 50 lm or less. In this embodiment, the light 60 that emits illumination light of 10 lm is used.

[0121] The light emitting surface 61 of the light 60 is substantially flat. The rotation axis AX of the anvil 10 and a normal to the light emitting surface 61 are parallel. The light 60 is supported on the circuit board 70 so that the rotation axis AX of the anvil 10 and a normal to the light emitting surface 61 are parallel.

[0122] The optical member 80 is disposed so as to face the light-emitting surface 61 of the light 60. At least a portion of the optical member 80 is disposed forward of the light 60 and the circuit board 70. The optical member 80 includes a light-transmitting portion 81 through which the illumination light emitted from the light-emitting surface 61 of the light 60 passes, and a connecting portion 82 connected to the light-transmitting portion 81.

[0123] The optical member 80 is made of a light-transmitting synthetic resin. In this embodiment, the optical member 80 is made of a polycarbonate resin. The optical member 80 may also be made of an acrylic resin.

[0124] The light-transmitting portion 81 is disposed in front of the light 60. The light-transmitting portion 81 is disposed so as to face the light-emitting surface 61. The light-transmitting portion 81 has an incident surface 83 into which the illumination light emitted from the light-emitting surface 61 of the light 60 is incident, and an exit surface 84 from which the illumination light is emitted. The incident surface 83 faces the light-emitting surface 61. In an embodiment, the light-emitting surface 61 and the incident surface 83 face each other with a gap therebetween. Note that the light-emitting surface 61 and at least a portion of the incident surface 83 may be in contact with each other.

[0125] The light-transmitting portion 81 has a lens effect. The light-transmitting portion 81 refracts the illumination light emitted from the light-emitting surface 61 of the light 60. The light-transmitting portion 81 has a refractive surface 85 that refracts the illumination light emitted from the light-emitting surface 61 of the light 60 radially outward from the rotation axis AX. In the embodiment, the incident surface 83 includes the refractive surface 85. As shown in FIG. 9 , the refractive surface 85 is inclined radially outward so as to approach the light 60. That is, in the embodiment, the incident surface 83 is inclined rearward radially outward.

[0126] At least a portion of the cover member 90 is disposed forward of the light 60 and the circuit board 70. In the embodiment, the cover member 90 is substantially annular.

[0127] The cover member 90 is made of synthetic resin. The cover member 90 may be made of the same material as the optical member 80. The cover member 90 may be made of a material different from that of the optical member 80. In the embodiment, the cover member 90 is made of polycarbonate resin. The cover member 90 may also be made of acrylic resin. The optical member 80 and the cover member 90 are integrally molded. The optical member 80 and the cover member 90 are integrated by, for example, insert molding.

[0128] The cover member 90 has an inner peripheral wall portion 90E, an outer peripheral wall portion 90F, and a front wall portion 90G. At least a portion of the front wall portion 90G is arranged to connect the front end portion of the inner peripheral wall portion 90E and the front end portion of the outer peripheral wall portion 90F. The front wall portion 90G is arranged at the front portion of the cover member 90. The front wall portion 90G is substantially annular. A lightening portion 90H is provided at the upper portion of the front wall portion 90G. A groove 92 is provided at the rear portion of the front wall portion 90G excluding the lightening portion 90H. The groove 92 is provided between the inner peripheral wall portion 90E and the outer peripheral wall portion 90F. The optical member 80 and the circuit board 70 are each arranged in the groove 92 of the cover member 90. The circuit board 70 is arranged in the groove 92 so that the light emitting surface 61 of the light 60 faces forward. The circuit board 70 is arranged in the groove 92 so that the support surface 71 of the circuit board 70 faces forward.

[0129] In the embodiment, an opening 91 is provided in a part of the cover member 90. The opening 91 is provided in the front wall portion 90G. The light transmitting portion 81 of the optical member 80 is disposed in the opening 91 of the cover member 90. The light transmitting portion 81 is not covered by the cover member 90. In other words, the cover member 90 is not disposed in front of or behind the light transmitting portion 81. The connecting portion 82 of the optical member 80 is fixed to the cover member 90.

[0130] The optical member 80 and the cover member 90 are disposed around the bearing support portion 402. The optical member 80 and the cover member 90 are disposed forward of the hammer case cover 5. The optical member 80 and the cover member 90 are supported by the hammer case 4 via the hammer case cover 5.

[0131] The optical member 80 and the cover member 90 protect the light 60 and the circuit board 70. The optical member 80 and the cover member 90 prevent contact between the light 60 and the circuit board 70 and objects around the power tool 1. More specifically, the optical member 80 and the cover member 90 prevent contact between the light 60 and the circuit board 70 and objects in front of the optical member 80 and the cover member 90. The optical member 80 and the cover member 90 also prevent contact between the light 60 and the circuit board 70 and objects radially outside the optical member 80 and the cover member 90. The optical member 80 and the cover member 90 are integrally molded so that no gap is formed between them. The optical member 80 and the cover member 90 have a waterproof function that prevents moisture from entering the light 60 and the circuit board 70. More specifically, the optical member 80 and the cover member 90 prevent moisture from entering from the front side of the optical member 80 and the cover member 90, from the radially outer side, and from the radially inner side. The optical member 80 and the cover member 90 have a dustproof function that prevents dust from entering the light 60 and the circuit board 70. More specifically, the optical member 80 and the cover member 90 prevent dust from entering from the front side of the optical member 80 and the cover member 90, from the radially outer side, and from the radially inner side.

[0132] The adhesive resin part 55 fixes the circuit board 70 to the optical member 80 and the cover member 90. At least a portion of the adhesive resin part 55 covers the rear surface of the circuit board 70. The cover member 90 is fixed to the circuit board 70 by the adhesive resin part 55. The optical member 80 is fixed to the circuit board 70 via the cover member 90. The adhesive resin part 55 is arranged so as to block the front and rear surfaces of the circuit board 70 from the outside air. In other words, the adhesive resin part 55 has a waterproof function that prevents moisture from entering the light 60 and the circuit board 70 from the rear. The adhesive resin part 55 also has a dustproof function that prevents dust from entering the light 60 and the circuit board 70 from the rear. The adhesive resin part 55 isolates the light 60 and the circuit board 70 from moisture and dust. Even if water or the like is accidentally splashed onto the power tool 1 or the power tool 1 is used in a work site where dust is flying, damage to the light 60 and the circuit board 70 is suppressed.

[0133] The fixing member 50 contacts at least a part of the front surface of the cover member 90. The fixing member 50 is supported by the tip portion 405. The fixing member 50 contacts at least a part of the front surface of the cover member 90 so that the light unit 18 including the optical member 80 and the cover member 90 does not slip out forward from the bearing support portion 402.

[0134] In the embodiment, the fixing member 50 includes a ring spring. A support groove 52 is provided on the outer surface of the bearing support portion 402. The support groove 52 is formed to surround the rotation axis AX. The ring spring is disposed in the support groove 52. Note that the fixing member 50 is not limited to a ring spring, and may be, for example, a bumper, a metal sleeve, a circlip, or the like.

[0135] At least a portion of the cover member 90 contacts the hammer case cover 5. In the embodiment, at least a portion of the rear of the cover member 90 contacts the hammer case cover 5. The light unit 18 including the cover member 90 is sandwiched between the fixing member 50 and the hammer case cover 5 in the front-to-rear direction.

[0136] 8, in this embodiment, the front end 5H of the hammer case cover 5 is disposed radially inward of the rear end of the cover member 90. The outer surface of the cover member 90 is not covered by the hammer case cover 5.

[0137] The buffer member 51 is disposed between the cover member 90 and the hammer case 4. The buffer member 51 prevents vibrations of the hammer case 4 from being transmitted to the light unit 18. The buffer member 51 prevents heat from the hammer case 4 from being transmitted to the light unit 18. The buffer member 51 comes into contact with the light unit 18. In the embodiment, the buffer member 51 comes into contact with both the cover member 90 and the adhesive resin part 55. The buffer member 51 comes into contact with the hammer case 4. The buffer member 51 also functions as a bumper when the light unit 18 comes into contact with a surrounding object. In other words, the buffer member 51 has the function of absorbing impacts received by the light unit 18.

[0138] A porous member made of synthetic resin is exemplified as the buffer member 51. An example of the porous member is soft urethane sponge.

[0139] 8, the cover member 90 has a front support portion 90A and a rear support portion 90B. The front support portion 90A is disposed in a recess 402A provided in the outer surface of the bearing support portion 402. The rear support portion 90B is disposed in a recess 5E provided in the front end portion 5H of the hammer case cover 5.

[0140] The hammer case cover 5 is fixed to the motor accommodating portion 21 of the housing 2. As shown in FIG. 6, the hammer case cover 5 has a cover portion 5A, a ring portion 5B, a hook portion 5C, and an opening 5D. The cover portion 5A covers at least a portion of the outer surface of the hammer accommodating portion 401. The cover portion 5A is cylindrical. The ring portion 5B is disposed at the front end portion of the cover portion 5A. The ring portion 5B faces the rear end portion of the cover member 90. The hook portion 5C is disposed at the rear portion of the cover portion 5A. The hook portion 5C is hooked onto the housing 2.

[0141] As shown in Figure 6, a notch 5F is provided at the bottom of the front end 5H of the hammer case cover 5. An engagement portion 90C provided at the bottom of the cover member 90 fits into the notch 5F. This prevents relative rotation between the hammer case cover 5 and the cover member 90. In addition, a locking portion 90D that prevents rotation of the fixing member 50 is provided at the bottom of the front end of the cover member 90. The locking portion 90D prevents relative rotation between the cover member 90 and the fixing member 50.

[0142] As shown in Fig. 6, the bearing support portion 402 has angular portions 403 that protrude radially outward. Six angular portions 403 are provided at equal intervals around the rotation axis AX. In this embodiment, at least a portion of the bearing support portion 402 is hexagonal in a plane perpendicular to the rotation axis AX. In the following description, the hexagonal portion of the bearing support portion 402 including the six angular portions 403 will be referred to as a rotation prevention portion 404 as appropriate.

[0143] As shown in FIG. 6 , the buffer member 51 is annular. The buffer member 51 is disposed around the anti-rotation portion 404 of the bearing support portion 402. The buffer member 51 is formed to fit the outer shape of the anti-rotation portion 404 of the bearing support portion 402. The buffer member 51 has recesses 51C in which the corners 403 of the anti-rotation portion 404 are disposed. Six recesses 51C are provided on the inner surface of the buffer member 51 so that one of the six corners 403 is disposed in one recess. By disposing the corners 403 in the recesses 51C, relative rotation between the buffer member 51 and the bearing support portion 402 is suppressed.

[0144] The circuit board 70 is disposed radially outward from the bearing support portion 402. As shown in FIG. 7 , the circuit board 70 is formed to fit the outer shape of the anti-rotation portion 404 of the bearing support portion 402. The circuit board 70 has a recess 70C disposed at a corner 403 of the anti-rotation portion 404. By disposing the corner 403 in the recess 70C, relative rotation between the circuit board 70 and the bearing support portion 402 is suppressed.

[0145] The inner circumferential wall portion 90E defines a housing portion 93 in which the anti-rotation portion 404 of the bearing support portion 402 is disposed. The housing portion 93 is provided inside the inner circumferential wall portion 90E. The inner circumferential wall portion 90E is formed to fit the outer shape of the anti-rotation portion 404. As shown in FIG. 9 , the inner circumferential wall portion 90E is disposed between the circuit board 70 and the bearing support portion 402. The inner circumferential wall portion 90E prevents contact between the circuit board 70 and the bearing support portion 402.

[0146] A plurality of lights 60 are mounted on the circuit board 70. The lights 60 are arranged around the rotation axis AX. As shown in FIG. 7 , in this embodiment, the lights 60 include a plurality of left lights 601 arranged on the left side of the rotation axis AX and a plurality of right lights 602 arranged on the right side of the rotation axis AX. The right lights 602 are arranged in the same number as the left lights 601.

[0147] In this embodiment, four lights 60 are provided on the circuit board 70. Two left lights 601 are provided. The left lights 601 include a left light 601A and a left light 601B. Two right lights 602 are provided. The right lights 602 include a right light 602A and a right light 602B.

[0148] In the radial direction, the distance between the rotation axis AX and the left light 601A, the distance between the rotation axis AX and the left light 601B, the distance between the rotation axis AX and the right light 602A, and the distance between the rotation axis AX and the right light 602B are substantially equal. If diagonal lines La and Lb are defined that pass through the rotation axis AX and are perpendicular to the rotation axis AX, the left light 601A and the right light 602B are disposed on the diagonal line La, and the left light 601B and the right light 602A are disposed on the diagonal line Lb. Furthermore, the left light 601A and the right light 602A are disposed above the rotation axis AX, and the left light 601B and the right light 602B are disposed below the rotation axis AX. In the vertical direction, the position of the left light 601A and the position of the right light 602A are substantially equal. In the vertical direction, the position of the left light 601B and the position of the right light 602B are substantially equal. In the left-right direction, the position of the left light 601A and the position of the left light 601B are substantially equal. In the left-right direction, the position of the right light 602A and the position of the right light 602B are substantially equal. When an axis of symmetry that passes through the rotation axis AX and extends in the up-down direction is defined, the left lights 601 (611A, 611B) and the right lights 602 (612A, 612B) are line-symmetric.

[0149] The circuit board 70 is disposed around a portion of the rotation axis AX. A notch 73 is formed in the upper portion of the circuit board 70.

[0150] The cover member 90 is annular. The optical member 80 is integrally molded with the cover member 90. The optical member 80 and the circuit board 70 are each disposed in a groove 92. The circuit board 70 is disposed in the groove 92 so that the light emitting surface 61 of the light 60 faces forward.

[0151] The anti-rotation portion 404 of the bearing support portion 402 is disposed in the accommodating portion 93 of the cover member 90. The accommodating portion 93 is defined radially inward of the inner circumferential wall portion 90E. The inner circumferential wall portion 90E is formed to fit the outer shape of the anti-rotation portion 404. The accommodating portion 93 has recesses 93C in which the corners 403 of the anti-rotation portion 404 are disposed. Six recesses 93C are provided in the cover member 90 so that one of the six corners 403 is disposed in one recess. By disposing the corners 403 in the recesses 93C, relative rotation between the cover member 90 and the bearing support portion 402 is suppressed.

[0152] The adhesive resin portion 55 fixes the circuit board 70 and the cover member 90 together. At least a portion of the adhesive resin portion 55 covers the rear surface of the circuit board 70. After the circuit board 70 is placed in the groove 92 so that the light-emitting surface 61 of the light 60 faces forward, molten synthetic resin is supplied from behind the circuit board 70 to the boundary between the circuit board 70 and the cover member 90. The synthetic resin is solidified to form the adhesive resin portion 55. The circuit board 70 and the cover member 90 are fixed together by the adhesive resin portion 55 when the synthetic resin is solidified.

[0153] <Optical components> FIG. 14 is an exploded perspective view from the front showing a circuit board 70, an optical member 80, and a cover member 90 according to the embodiment. FIG. 15 is an exploded perspective view from the rear showing a circuit board 70, an optical member 80, and a cover member 90 according to the embodiment. FIG. 16 is a view of the optical member 80 according to the embodiment as seen from the front. FIG. 17 is a view of the optical member 80 according to the embodiment as seen from the rear. FIG. 18 is a perspective view of the light-transmitting portion 81 of the optical member 80 according to the embodiment as seen from the front. FIG. 19 is a perspective view of the light-transmitting portion 81 of the optical member 80 according to the embodiment as seen from the rear. FIG. 20 is a cross-sectional view taken along line CC in FIG. 17. FIG. 21 is a cross-sectional view taken along line DD in FIG. 17. FIG. 22 is a cross-sectional view taken along line EE in FIG. 17.

[0154] The light unit 18 has a light 60, a circuit board 70 that supports the light 60, an optical member 80, and a cover member 90. Lead wires 72 are provided on the lower part of the circuit board 70. The optical member 80 and the cover member 90 are molded integrally.

[0155] The optical member 80 includes a light-transmitting portion 81 through which illumination light emitted from the light 60 passes, and a connecting portion 82 connected to the light-transmitting portion 81. A plurality of light-transmitting portions 81 are provided. The number of light-transmitting portions 81 is equal to the number of lights 60. Each light-transmitting portion 81 is arranged to face one light 60. In this embodiment, four light-transmitting portions 81 are provided.

[0156] In the embodiment, the optical member 80 includes an optical member 80L disposed on the left side of the rotation axis AX and an optical member 80R disposed on the right side of the rotation axis AX.

[0157] 14, the optical member 80L has two light-transmitting portions 81 through which the illumination light emitted from the left light 601 passes. In the optical member 80L, one light-transmitting portion 81 is disposed to face the light-emitting surface 61 of the left light 601A, and the other light-transmitting portion 81 is disposed to face the light-emitting surface 61 of the left light 601B. In the optical member 80L, the connecting portion 82 is disposed to connect the two light-transmitting portions 81.

[0158] 14, the optical member 80R has two light-transmitting portions 81 through which the illumination light emitted from the right light 602 passes. In the optical member 80R, one light-transmitting portion 81 is disposed to face the light-emitting surface 61 of the right light 602A, and the other light-transmitting portion 81 is disposed to face the light-emitting surface 61 of the right light 602B. In the optical member 80R, the connecting portion 82 is disposed to connect the two light-transmitting portions 81.

[0159] The connecting portion 82 is formed to fit the outer shape of the anti-rotation portion 404 of the bearing support portion 402. The connecting portion 82 has a recess 82C in which the corner portion 403 of the anti-rotation portion 404 is disposed. By disposing the corner portion 403 in the recess 82C, relative rotation between the optical element 80 and the bearing support portion 402 is suppressed.

[0160] The light transmitting portion 81 has an incident surface 83 onto which the illumination light emitted from the light 60 is incident, and an exit surface 84 from which the illumination light transmitted through the light transmitting portion 81 is emitted.

[0161] The incident surface 83 is disposed to face the light-emitting surface 61 of the light 60. In the embodiment, a recess 86 is formed in a portion of the rear surface of the optical element 80. The recess 86 is formed so as to be recessed forward from the rear surface of the optical element 80. In a plane perpendicular to the rotation axis AX, the outer shape of the recess 86 is substantially triangular. The incident surface 83 includes an inner surface of the recess 86. At least a portion of the incident surface 83 is inclined rearward and radially outward. Illumination light emitted from the light-emitting surface 61 of the light 60 is refracted at the incident surface 83 radially outward from the rotation axis AX. The incident surface 83 functions as a refractive surface 85 that refracts the illumination light radially outward.

[0162] 20 , the incident surface 83 includes a first refracting surface 85A that refracts the illumination light emitted from the light 60 in a first direction D1 and a second refracting surface 85B that refracts the illumination light emitted from the light 60 in a second direction D2. The first refracting surface 85A is inclined rearward radially outward and rearward toward one circumferential side. The second refracting surface 85B is inclined rearward radially outward and rearward toward the other circumferential side.

[0163] The first direction D1 is a direction toward the outside in the radial direction and toward one side in the circumferential direction. As shown in Fig. 16, the illumination light emitted from the light-emitting surface 61 of the light 60 is refracted at the first refraction surface 85A, and then emitted from the emission surface 84 and travels toward the outside in the radial direction and toward one side in the circumferential direction.

[0164] The second direction D2 is a direction toward the radially outward side and the other circumferential side. As shown in Fig. 16, the illumination light emitted from the light-emitting surface 61 of the light 60 is refracted at the second refracting surface 85B, and then emitted from the emission surface 84 and travels toward the radially outward side and the other circumferential side.

[0165] The emission surface 84 is arranged to face forward. In the embodiment, the emission surface 84 is a flat surface. The rotation axis AX and the normal to the emission surface 84 are parallel. Note that the normal to the emission surface 84 does not have to be parallel to the rotation axis AX. The optical member 80 has a peripheral wall portion 87 arranged to surround the optical path of the illumination light emitted from the emission surface 84. The peripheral wall portion 87 is provided to protrude forward from the periphery of the emission surface 84. The emission surface 84 is arranged rearward of the front end portion of the peripheral wall portion 87. The peripheral wall portion 87 prevents contact between the emission surface 84 and objects around the power tool 1. By preventing contact between the objects and the emission surface 84, damage to the emission surface 84 is prevented.

[0166] <Assembling power tools> 23 is an exploded perspective view showing a power tool 1 according to an embodiment. The housing 2 includes a left housing 2L and a right housing 2R. In this embodiment, at least a portion of the hammer case cover 5 is fixed to the housing 2 by being sandwiched between the left housing 2L and the right housing 2R. In this embodiment, the rear portion of the cover portion 5A and the hook portion 5C are sandwiched between the left housing 2L and the right housing 2R.

[0167] The hook portions 5C are provided on the left and right portions of the cover portion 5A. Recesses 200 into which the hook portions 5C are hooked are provided on the inner surfaces of the left housing 2L and the right housing 2R.

[0168] A protrusion 4A for positioning the hammer case cover 5 is provided on a part of the hammer case 4. An opening 5D (see FIG. 6) is provided on a part of the hammer case cover 5. The hammer case 4 and the hammer case cover 5 are positioned by arranging the protrusion 4A in the opening 5D.

[0169] When assembling the power tool 1, the hammer case 4 and the hammer case cover 5 are connected so that the outer surface of the hammer accommodating portion 401 is covered by the cover portion 5A. By arranging the protrusion 4A in the opening 5D, the outer surface of the hammer accommodating portion 401 is covered by the cover portion 5A. In addition, the buffer member 51 and the light unit 18 are attached to the bearing support portion 402. The buffer member 51 and the light unit 18 are inserted into the bearing support portion 402 from the front of the bearing support portion 402. The buffer member 51 and the light unit 18 are attached to the anti-rotation portion 404. After the buffer member 51 and the light unit 18 are attached to the anti-rotation portion 404, the fixing member 50 is placed in the support groove 52. After the hammer case 4 and hammer-case cover 5 are connected and the buffer member 51, light unit 18, and fixing member 50 are attached to the bearing support portion 402, at least a portion of the hammer case 4 and hammer-case cover 5 are sandwiched between the left housing 2L and the right housing 2R. The hook portion 5C is hooked into recesses provided in the left housing 2L and the right housing 2R. After at least a portion of the hammer case 4 and hammer-case cover 5 are sandwiched between the left housing 2L and the right housing 2R, the left housing 2L and the right housing 2R are fixed together with a plurality of screws 2S. In addition, the rear cover 3 is fixed to the rear of the motor accommodating portion 21 with screws 3S.

[0170] <Power tool operation> Next, the operation of the power tool 1 will be described. For example, when performing a screwdriver operation on a workpiece, a tool bit (driver bit) to be used for the screwdriver operation is inserted into the tool hole 10A of the anvil 10. The tool bit inserted into the tool hole 10A is held by the bit sleeve 11. After the tool bit 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 the light 60 is simultaneously turned on. When the motor 6 is started, the rotor shaft 33 of the rotor 27 rotates. When the rotor shaft 33 rotates, the rotational force of the rotor shaft 33 is transmitted to the planetary gear 42 via the pinion gear 41. The planetary gear 42, meshed with the internal teeth of the internal gear 43, revolves around the pinion gear 41 while rotating on its axis. 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 rotor shaft 33.

[0171] When the spindle 8 rotates while the hammer 47 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.

[0172] As the screw tightening operation progresses, if a load greater than a predetermined value acts on the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. When the spindle 8 rotates while the hammer 47 is stopped, the hammer 47 moves rearward. As the hammer 47 moves rearward, contact between the hammer 47 and the anvil protrusion 102 is released. After moving rearward, the hammer 47 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 by the hammer 47 in the rotational direction. As a result, the anvil 10 rotates around the rotation axis AX with high torque. Therefore, the screw is tightened into the workpiece with high torque.

[0173] <Effects> As described above, in the embodiment, the power tool 1 includes the motor 6, the anvil 10 which is an output unit that rotates around the rotation axis AX by the motor 6, and a plurality of lights 60 arranged at intervals around the anvil 10. The power tool 1 also includes an optical member 80 having a refractive surface 85 that refracts illumination light emitted from the light-emitting surface 61 of the light 60 radially outward from the rotation axis AX.

[0174] In the above configuration, the illumination light emitted from the light 60 is refracted by the refractive surface 85 of the optical member 80 and travels radially outward from the rotation axis AX. This reduces the overlapping area of ​​the illumination light emitted from the first light 60 and the illumination light emitted from the second light 60 on the surface of the work object of the power tool 1. Furthermore, when the tool bit is attached to the anvil 10, the illumination light emitted from the light 60 is less likely to be irradiated onto the tool bit, thereby preventing the shadow of the tool bit from being cast on the surface of the work object. This ensures that the work object of the power tool 1 is properly illuminated.

[0175] The spread of illumination light in the left-right direction will now be described. Fig. 24 is a schematic diagram showing a light unit 18J according to a comparative example. Fig. 25 is a schematic diagram showing a light unit 18 according to the embodiment. Fig. 24 and Fig. 25 each show the spread of illumination light in the left-right direction.

[0176] The assumed tool bit 300 here is a so-called driver bit, and the workpiece 310 is wood. A screw to be fastened is held in a rotationally fixed state at the tip of the driver bit. The length of the driver bit assumed to be most commonly used in the technical field related to the power tool 1 is approximately 65 mm. Therefore, a screw tightening operation using a driver bit of approximately 65 mm is assumed here. The rear end of the driver bit overlaps with the anvil 10, so the driver bit protrudes approximately 40 mm from the front end of the anvil 10. Note that Figures 24 and 25 each show a state after the screw tightening operation is completed, in which the position of the front end of the tool bit 300 and the position of the surface of the workpiece 310 are approximately the same.

[0177] As shown in FIG. 24 , the light unit 18J according to the comparative example includes a light 60 and an optical member 80J. The optical member 80J does not have refractive power. When the lights 60 are disposed on both the left and right sides of the tool bit 300, the overlapping area between the illumination light emitted from the first light 60 and the illumination light emitted from the second light 60 on the surface of the work object 310 becomes large. Furthermore, when the tool bit 300 is attached to the anvil 10, the illumination light emitted from the light 60 is likely to irradiate the tool bit 300. When the illumination light emitted from the light 60 irradiates the tool bit 300, a shadow of the tool bit 300 may be formed on the surface of the work object 310. When the shadow of the tool bit 300 is formed on the surface of the work object 310, it becomes difficult for the operator to visually recognize the work object, which may reduce workability.

[0178] As shown in FIG. 25 , the light unit 18 according to the embodiment includes a light 60 and an optical member 80. The optical member 80 has a refractive surface 85 that refracts the illumination light emitted from the light 60 radially outward. FIG. 25 illustrates an example in which the illumination light emitted from the left light 60 is refracted leftward, and the illumination light emitted from the right light 60 is refracted rightward. When the lights 60 are disposed on both the left and right sides of the tool tip 300, the overlapping area between the illumination light emitted from the first light 60 and the illumination light emitted from the second light 60 on the surface of the work object 310 of the power tool 1 is reduced. Furthermore, when the tool tip 300 is attached to the anvil 10, the illumination light emitted from the light 60 is less likely to be irradiated onto the tool tip 300, thereby preventing the shadow of the tool tip 300 from being cast on the surface of the work object 310. This reduces the degradation of workability. Note that Figure 25 shows an example in which the refraction angle of the refraction surface 85 is optimized so that the shadow of the driver bit is not formed on the surface of the workpiece 310 when a driver bit with a length of approximately 65 mm is used.

[0179] The length of the driver bit is not limited to 65 mm. Driver bits of various lengths other than 65 mm are commercially available. Screws of various lengths are also commercially available. Examples of screw lengths include 120 mm, 90 mm, and 75 mm. Depending on the length of the driver bit expected to be used, the refraction angle of the refraction surface 85 may be optimized so that a shadow of the driver bit is not formed on the surface of the workpiece 310.

[0180] Next, the spread of illumination light in the vertical direction (circumferential direction) will be described. Fig. 26 is a schematic diagram showing a light unit 18J according to a comparative example. Fig. 27 is a schematic diagram showing a light unit 18 according to the embodiment. Fig. 26 and Fig. 27 each show the spread of illumination light in the vertical direction (circumferential direction).

[0181] 26, an optical member 80J according to the comparative example has no refractive power, and therefore, in a light unit 18J according to the comparative example, the range over which illumination light spreads in the vertical direction (circumferential direction) is small.

[0182] 27, an optical member 80J according to the embodiment has a refractive surface 85. As described with reference to Fig. 20, the refractive surface 85 includes a first refractive surface 85A that refracts the illumination light emitted from the light 60 radially outward and toward one side in the circumferential direction, and a second refractive surface 85B that refracts the illumination light emitted from the light 60 radially outward and toward the other side in the circumferential direction. Therefore, in the light unit 18 according to the embodiment, the range over which the illumination light spreads in the up-and-down direction (circumferential direction) is large.

[0183] Fig. 28 is a schematic diagram showing the illumination range of illumination light according to the embodiment. The optical member 80 according to the embodiment refracts the illumination light emitted from the light 60 radially outward and spreads it in the circumferential direction. Therefore, as shown in Fig. 28, the illumination range Ra of the illumination light on the surface of the workpiece 310 is elliptical. In the embodiment, four lights 60 are arranged, so four elliptical illumination ranges Ra are formed around the tool bit 300. The illumination range Ri according to the comparative example is smaller than the illumination range Ra.

[0184] In the embodiment, the optical member 80 has an incident surface 83 onto which the illumination light emitted from the light 60 is incident, and an exit surface 84 from which the illumination light is emitted.

[0185] The above configuration reduces exposure of the entrance surface 83 including the refractive surface 85. Therefore, damage to the refractive surface 85 is reduced.

[0186] In the embodiment, the incident surface 83 faces the light emitting surface 61 .

[0187] In the above configuration, no other optical element is placed between the light-emitting surface 61 of the light 60 and the incident surface 83 of the optical element 80, thereby preventing the structure of the optical system through which the illumination light emitted from the light 60 passes from becoming larger and more complex.

[0188] In an embodiment, the refractive surface 85 is angled radially outward toward the light 60 .

[0189] In the above configuration, the illumination light emitted from the light emitting surface 61 of the light 60 can be refracted at the refracting surface 85 to the outside in the radial direction of the rotation axis AX.

[0190] In the embodiment, the refractive surface 85 includes a first refractive surface 85A that refracts the illumination light in a first direction D1 and a second refractive surface 85B that refracts the illumination light in a second direction D2.

[0191] In the above configuration, the illumination light emitted from the light-emitting surface 61 of the light 60 is refracted in multiple directions, so that the illumination range of the illumination light on the surface of the work target 310 of the power tool 1 is expanded.

[0192] In an embodiment, the power tool 1 comprises a circuit board 70 having a support surface 71 that supports the light 60 .

[0193] In the above configuration, the light 60 can emit illumination light while being supported on the support surface 71 of the circuit board .

[0194] In this embodiment, the rotation axis AX and the normal to the light emitting surface 61 are parallel to each other.

[0195] In the above configuration, the illumination light emitted from the light emitting surface 61 of the light 60 travels parallel to the rotation axis AX, and then can be refracted by the optical member 80 radially outward from the rotation axis AX.

[0196] In the embodiment, the optical member 80 is fixed to the circuit board 70 .

[0197] In the above configuration, the optical member 80 is fixed to the circuit board 70, so that changes in the relative positions of the light 60, the optical member 80, and the circuit board 70 are suppressed.

[0198] In the embodiment, the power tool 1 includes a cover member 90 that is disposed forward of at least a portion of the circuit board 70, is made of a material different from that of the optical member 80, and is integrally molded with the optical member 80.

[0199] In the above configuration, the circuit board 70 is protected by the cover member 90. By protecting the circuit board 70, the light 60 can operate properly. Therefore, the work target 310 of the power tool 1 is properly illuminated.

[0200] In the embodiment, the optical member 80 and the cover member 90 are fixed to the circuit board 70 .

[0201] In the above configuration, the optical member 80 and the cover member 90 are each fixed to the circuit board 70, so that changes in the relative positions of the light 60, the optical member 80, and the circuit board 70 are suppressed.

[0202] In this embodiment, the power tool 1 includes a speed reducer 7 and a spindle 8 that transmit the rotational force of the motor 6 to the anvil 10, and a hammer case 4 that houses at least a portion of the spindle 8 and the anvil 10. The optical member 80 and the cover member 90 are supported by the hammer case 4.

[0203] In the above configuration, changes in the relative positions of the optical member 80 and the cover member 90, and the hammer case 4 are suppressed.

[0204] In this embodiment, the hammer case 4 has a hammer housing portion 401 that is arranged around the spindle 8 and the striking mechanism 9, and a bearing support portion 402 that is arranged forward of the hammer housing portion 401 and has an outer diameter smaller than that of the hammer housing portion 401. The optical member 80 and the cover member 90 are arranged around the bearing support portion 402.

[0205] In the above configuration, the optical member 80 and the cover member 90 are arranged around the small-diameter bearing support portion 402, which prevents the power tool 1 from becoming too large. In particular, this prevents the hammer housing portion 401 from becoming too large (larger in diameter). Since the hammer housing portion 401 is prevented from becoming too large (larger in diameter), the operability of using the power tool 1 is improved.

[0206] In the embodiment, the bearing support portion 402 has a corner portion 403 that protrudes radially outward, the optical member 80 has a recess 82C in which the corner portion 403 is arranged, and the cover member 90 has a recess 93C in which the corner portion 403 is arranged.

[0207] In the above configuration, the optical member 80 and the cover member 90 are properly aligned with the bearing support portion 402. Furthermore, relative rotation between the optical member 80 and the cover member 90 and the bearing support portion 402 is suppressed.

[0208] In the embodiment, the power tool 1 includes a fixing member 50 supported by the bearing support portion 402 and in contact with at least a portion of the front surface of the cover member 90 .

[0209] In the above configuration, the fixing member 50 prevents the cover member 90 from slipping out forward from the bearing support portion 402. Furthermore, relative movement between the cover member 90 and the bearing support portion 402 in the front-rear direction is prevented.

[0210] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0211] 29 is a perspective view showing a light unit 181 according to an embodiment. The light unit 181 has an optical member 80 and a cover member 901. The optical member 80 and the cover member 901 are integrally molded.

[0212] In the embodiment, the cover member 901 is formed of a material different from that of the optical member 80. The optical member 80 has a light-transmitting portion 81 through which the illumination light emitted from the light-emitting surface 61 of the light 60 passes. The cover member 901 includes a light-blocking portion 94. The cover member 901 is formed of a synthetic resin in which a coloring material is dispersed. As an example, the optical member 80 is formed of a polycarbonate resin. The cover member 901 is formed of a polycarbonate resin or an acrylic resin in which a white pigment is dispersed. Note that the pigment dispersed in the polycarbonate resin or the acrylic resin does not have to be a white pigment and may be, for example, a black pigment. The light-blocking portion 94 is formed by coloring the cover member 901.

[0213] The light-shielding portion 94 makes it difficult to see the circuit board 70 from outside the cover member 901, thereby improving the aesthetic appearance of the power tool 1. Furthermore, irradiation of the circuit board 70 by external light is suppressed.

[0214] As described above, in the embodiment, the cover member 901 is made of a material different from that of the optical member 80. The cover member 901 is molded integrally with the optical member 80.

[0215] In the above configuration, the light 60 is protected by the optical member 80, and the circuit board 70 is protected by the cover member 901. Protecting the light 60 reduces damage to the light 60. Protecting the circuit board 70 allows the light 60 to operate properly. The cover member 901 is made of a different material from the optical member 80, so the circuit board 70 is properly protected. Furthermore, the optical member 80 and the cover member 90 are integrally molded, so changes in the relative positions of the optical member 80 and the cover member 90 are reduced. Therefore, the work target 310 of the power tool 1 is properly illuminated.

[0216] In the embodiment, the optical member 80 includes a light-transmitting portion 81 through which the illumination light emitted from the light-emitting surface 61 passes. The cover member 901 includes a light-shielding portion 94.

[0217] In the above configuration, the illumination light emitted from the light-emitting surface 61 of the light 60 passes through the light-transmitting portion 81 and is irradiated onto the work target 310 of the power tool 1. The light-shielding portion 94 makes it difficult to see the circuit board 70 from outside the cover member 901, improving the aesthetic appeal of the power tool 1. Furthermore, irradiation of external light onto the circuit board 70 is suppressed.

[0218] In this embodiment, the optical member 80 is made of synthetic resin, and the cover member 901 is made of synthetic resin in which a coloring material is dispersed.

[0219] In the above configuration, the optical member 80 is made of a light-transmitting synthetic resin. The cover member 901 is formed by dispersing a coloring material in the synthetic resin that constitutes the optical member 80.

[0220] [Third embodiment] A third embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are designated by the same reference numerals, and the description of these components will be simplified or omitted.

[0221] 30 is a perspective view showing a light unit 182 according to an embodiment. The light unit 181 has an optical member 80 and a cover member 902. The optical member 80 and the cover member 902 are integrally molded.

[0222] In the embodiment, the cover member 902 may be formed of a different material from the optical member 80, or may be formed of the same material as the optical member 80. The optical member 80 has a light-transmitting portion 81 through which the illumination light emitted from the light-emitting surface 61 of the light 60 passes. The cover member 902 includes a light-blocking portion 95. The cover member 902 is formed of a synthetic resin. As an example, the optical member 80 is formed of a polycarbonate resin. The cover member 902 is formed of a polycarbonate resin or an acrylic resin. The surface of the cover member 902 is, for example, textured. Fine irregularities are formed on the surface of the cover member 902. By forming the fine irregularities on the surface of the cover member 902, the light-blocking portion 95 is formed.

[0223] The light-shielding portion 95 makes it difficult to see the circuit board 70 from outside the cover member 901, thereby improving the aesthetic appearance of the power tool 1. Furthermore, irradiation of the circuit board 70 by external light is suppressed.

[0224] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0225] Fig. 31 is a cross-sectional view schematically showing a light unit 183 according to an embodiment. As in the above-described embodiments, the light unit 183 has a light 60, a circuit board 70 that supports the light 60, and an optical member 80. In Fig. 31, the light 60, the circuit board 70, and the optical member 80 are not shown.

[0226] In this embodiment, the cover member 903 of the light unit 183 is made of the same material as the optical member 80. The cover member 903 and the optical member 80 are molded integrally.

[0227] The light unit 183 has a colored layer 96 provided on at least one of the rear surface of the cover member 903 and the front surface of the cover member 903. In the example shown in Fig. 31 , the colored layer 96 is provided on the front surface of the cover member 903. The colored layer 96 may be provided on the rear surface of the cover member 903, or on both the front and rear surfaces of the cover member 903.

[0228] The light unit 183 also has an adhesive layer 97 disposed between the cover member 903 and the colored layer 96, and a protective layer 98 that covers the colored layer 96. The colored layer 96 is provided on the front surface of the cover member 903 via the adhesive layer 97. The protective layer 98 is a transparent film made of synthetic resin.

[0229] FIG. 32 is a diagram schematically illustrating a method for manufacturing a cover member 903 according to an embodiment. In a first step, a colored layer 96 is formed on a protective layer 98, which is a transparent film. The colored layer 96 is formed on the surface of the protective layer 98 by, for example, screen printing. After the colored layer 96 is formed on the protective layer 98, an adhesive layer 97 is formed on the colored layer 96. The adhesive layer 97 is formed on the surface of the colored layer 96 by, for example, screen printing. After the colored layer 96 and adhesive layer 97 are formed on the protective layer 98, in a second step, the protective layer 98 is molded to match the shape of the front surface of the cover member 903. By molding the protective layer 98, the colored layer 96 and adhesive layer 97 are also molded. After the protective layer 98 is molded, in a third step, the colored layer 96 and protective layer 98 are adhered to the front surface of the cover member 903 via the adhesive layer 97. This forms the cover member 903 having the colored layer 96.

[0230] As described above, in the embodiment, the cover member 903 is made of the same material as the optical member 80. The cover member 903 is integrally molded with the optical member 80. The power tool 1 includes a colored layer 96 provided on at least one of the rear surface of the cover member 903 and the front surface of the cover member 903.

[0231] In the above configuration, the light 60 is protected by the optical member 80, and the circuit board 70 is protected by the cover member 903. Protecting the light 60 reduces damage to the light 60. Protecting the circuit board 70 allows the light 60 to operate properly. Furthermore, because the optical member 80 and the cover member 903 are integrally molded, changes in the relative positions of the optical member 80 and the cover member 903 are reduced. Therefore, the work target 310 of the power tool 1 is properly illuminated. Furthermore, the colored layer 96 provided on at least one of the rear surface and the front surface of the cover member 903 makes it difficult to see the circuit board 70 from outside the cover member 903, thereby improving the aesthetic appeal of the power tool 1. Furthermore, external light is prevented from irradiating the circuit board 70.

[0232] In the embodiment, the power tool 1 includes an adhesive layer 97 disposed between the cover member 903 and the colored layer 96 .

[0233] In the above configuration, the cover member 903 and the colored layer 96 are fixed together via the adhesive layer 97 .

[0234] In the embodiment, the power tool 1 includes a protective layer 98 covering the colored layer 96 .

[0235] In the above configuration, the colored layer 96 is protected by the protective layer 98. The protective layer 98 prevents the colored layer 96 from peeling off, for example.

[0236] [Other embodiments] In the above-described embodiment, the light 60 includes a chip LED and is mounted on the support surface 71 of the circuit board 70. That is, the light unit (18, etc.) has a surface mount device (SMD) LED. The light unit may include a chip on board (COB) LED. The light unit may include a bullet-type LED. Also, the circuit board 70 may be omitted.

[0237] In the above-described embodiment, the light 60 includes a plurality of left lights 601 provided to the left of the rotation axis AX, and a plurality of right lights 602 provided to the right of the rotation axis AX, the same number as the left lights 601. It is sufficient that a plurality of lights 60 are provided around the rotation axis AX. For example, the light 60 may be disposed above the rotation axis AX.

[0238] In the above-described embodiment, the power tool 1 is an impact driver. However, the power tool 1 may be an impact wrench.

[0239] 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]

[0240] 1...power tool, 2...housing, 2L...left housing, 2R...right housing, 2S...screw, 3...rear cover, 3S...screw, 4...hammer case (case), 4A...projection, 5...hammer case cover, 5A...cover part, 5B...ring part, 5C...hook part, 5D...opening, 5E...recess, 5F...notch, 5H...front end, 6...motor, 7...reduction mechanism (transmission mechanism), 8...spindle (transmission mechanism), 8A...flange part, 8B...spindle shaft part, 8C...circumferential wall part, 8D...spindle groove, 9...impact mechanism (transmission mechanism), 10...anvil (output part), 10A...tool hole, 10B...spindle Spindle protrusion, 11...bit sleeve, 12...fan, 12A...bush, 13...battery mounting section, 14...trigger switch, 15...forward / reverse switching lever, 16...operation panel, 16A...impact force switch, 16B...dedicated switch, 17...hand mode switching button, 18...light unit, 19...air intake, 20...exhaust port, 21...motor housing section, 22...grip section, 23...battery connector section, 24...bearing box, 24A...recess, 24B...recess, 25...battery pack, 26...stator, 27...rotor, 28...stator core, 29...front insulator, 29S ...Screw, 30...Rear insulator, 31...Coil, 32...Rotor core, 33...Rotor shaft, 34...Rotor magnet, 35...Sensor magnet, 37...Sensor board, 38...Fusing terminal, 39...Rotor bearing, 39F...Front rotor bearing, 39R...Rear rotor bearing, 41...Pinion gear, 42...Planetary gear, 42P...Pin, 43...Internal gear, 44...Spindle bearing, 45...Washer, 46...Bearing, 47...Hammer, 47A...Hole, 47B...Hammer groove, 47C...Recess, 48...Ball, 49...Coil spring, 50...Fixed Member, 51... buffer member, 51C... recess, 52... support groove, 55... adhesive resin portion, 60... light, 61... light-emitting surface, 70... circuit board, 71... support surface, 72... lead wire, 73... notch, 70C... recess, 80... optical member, 80L... optical member, 80R... optical member, 81... light-transmitting portion, 82... connecting portion, 82C... recess, 83... incident surface, 84... exit surface, 85... refracting surface, 85A... first refracting surface, 85B... second refracting surface, 86... recess, 87... peripheral wall portion, 90... cover member, 90A... front support portion, 90B... rear support portion, 90C... engagement portion, 90D... locking portion, 90E... inner peripheral wall portion, 90F... outer peripheral wall portion,90G...front wall portion, 90H...thickening portion, 91...opening, 92...groove, 93...storage portion, 93C...recess, 94...light-shielding portion, 95...light-shielding portion, 96...colored layer, 97...adhesive layer, 98...protective layer, 101...anvil body, 102...anvil protrusion portion, 181...light unit, 182...light unit, 183...light unit, 200...recess, 300...tipped tool, 310...work object, 401...hand Bearing accommodating portion (first cylindrical portion), 402...bearing support portion (second cylindrical portion), 402A...recessed portion, 403...corner portion, 404...rotation prevention portion, 405...tip portion, 601...left light, 601A...left light, 601B...left light, 602...right light, 602A...right light, 602B...right light, 901...cover member, 902...cover member, 903...cover member, AX...rotation axis, Ra...illumination range.

Claims

1. A motor; an output section to which a tool bit is attached and which is rotated around a rotation axis by the motor; a plurality of lights spaced around the output; an optical member disposed opposite the light-emitting surface of the light and having a refractive surface that refracts illumination light emitted from the light-emitting surface radially outward from the rotation axis; the refractive surface is inclined toward the light toward the outside in the radial direction, and refracts the illumination light emitted from the light-emitting surfaces of the plurality of lights to such an extent that the plurality of illumination lights do not overlap around a portion where the tip tool hits the work target, The illumination light emitted from the light transmitting portion of the optical member is irradiated onto the work object without being blocked. Power tools.

2. the optical member has an incident surface onto which the illumination light emitted from the light is incident and an exit surface from which the illumination light is emitted, the entrance surface includes the refractive surface; The power tool according to claim 1 .

3. The incident surface faces the light emitting surface. The power tool according to claim 2.

4. the refractive surface includes a first refractive surface that refracts the illumination light in a first direction radially outward and toward one circumferential side of the rotation axis, and a second refractive surface that refracts the illumination light in a second direction radially outward and toward the other circumferential side. The power tool according to any one of claims 1 to 3.

5. a circuit board having a support surface for supporting the light; The power tool according to any one of claims 1 to 4.

6. The rotation axis and the normal to the light-emitting surface are parallel to each other. The power tool according to claim 5.

7. The optical member is fixed to the circuit board. The power tool according to claim 5 or 6.

8. an annular cover member disposed forward of at least a portion of the circuit board, made of a material different from the optical member, and integrally molded with the optical member; An opening is provided in a part of the cover member, the optical member includes a light-transmitting portion through which illumination light emitted from the light-emitting surface passes, the light transmitting portion of the optical member is disposed in the opening of the cover member so as not to be covered by the cover member; The power tool according to any one of claims 5 to 7.

9. A motor; an output section to which a tool bit is attached and which is rotated around a rotation axis by the motor; a plurality of lights spaced around the output; a circuit board having a support surface for supporting the light; an optical member having a refractive surface that is disposed opposite to the light-emitting surface of the light and that refracts the illumination light emitted from the light-emitting surface toward the outside in the radial direction of the rotation shaft; an annular cover member disposed forward of at least a portion of the circuit board, made of a material different from the optical member, and integrally molded with the optical member; the refractive surface is inclined toward the light toward the outside in the radial direction, and refracts the illumination light emitted from the light-emitting surfaces of the plurality of lights to such an extent that the plurality of illumination lights do not overlap around a portion where the tip tool hits the work target, An opening is provided in a part of the cover member, the optical member includes a light-transmitting portion through which the illumination light emitted from the light-emitting surface passes, and the illumination light emitted from the light-transmitting portion is irradiated onto the work object without being blocked; the light transmitting portion of the optical member is disposed in the opening of the cover member so as not to be covered by the cover member; Power tools.

10. the optical member and the cover member are fixed to the circuit board; The power tool according to claim 9.

11. the cover member includes a light-shielding portion for suppressing irradiation of external light onto the circuit board; The power tool according to claim 9 or 10.

12. the optical member is made of a synthetic resin, The cover member is formed of a synthetic resin having a coloring material dispersed therein. The power tool according to any one of claims 9 to 11.

13. A motor; an output section to which a tool bit is attached and which is rotated around a rotation axis by the motor; a plurality of lights spaced around the output; a circuit board having a support surface for supporting the light; an optical member having a refractive surface that is disposed opposite to the light-emitting surface of the light and that refracts the illumination light emitted from the light-emitting surface toward the outside in the radial direction of the rotation shaft; an annular cover member disposed forward of at least a portion of a support surface of the circuit board, the cover member being made of the same material as the optical member and being integrally molded with the optical member; a colored layer provided on at least one of the rear surface of the cover member and the front surface of the cover member to suppress irradiation of external light onto the circuit board, the refractive surface is inclined toward the light toward the outside in the radial direction, and refracts the illumination light emitted from the light-emitting surfaces of the plurality of lights to such an extent that the plurality of illumination lights do not overlap around a portion where the tip tool hits the work target, An opening is provided in a part of the cover member, the optical member includes a light-transmitting portion through which the illumination light emitted from the light-emitting surface passes, and the illumination light emitted from the light-transmitting portion is irradiated onto the work object without being blocked; the light transmitting portion of the optical member is disposed in the opening of the cover member so as not to be covered by the cover member; Power tools.

14. an adhesive layer disposed between the cover member and the colored layer; The power tool of claim 13.

15. a protective layer covering the colored layer; The power tool according to claim 13 or 14.

16. a transmission mechanism that transmits the rotational force of the motor to the output portion; a case that accommodates the transmission mechanism and at least a portion of the output portion, the optical member and the cover member are supported by the case; The power tool according to any one of claims 8 to 15.

17. the case has a first cylindrical portion disposed around the transmission mechanism, and a second cylindrical portion disposed forward of the first cylindrical portion and having an outer diameter smaller than an outer diameter of the first cylindrical portion, the optical member and the cover member are disposed around the second cylindrical portion; The power tool of claim 16.

18. The second cylindrical portion has a corner portion that protrudes radially outward, The optical member and the cover member have recesses in which the corner portions are disposed.

18. The power tool of claim 17.

19. a fixing member supported by the second cylindrical portion and in contact with at least a portion of the front surface of the cover member; 19. The power tool according to claim 17 or 18.

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