Impact tool

Abstract

To prevent a work object from becoming difficult to visually recognize for an operator.SOLUTION: An impact tool comprises: a motor; a hammer rotated by the motor; an anvil to be struck in a rotation direction by the hammer; a hammer case for housing the hammer; and a light for illuminating at a front end side of the anvil with light. The hammer case is provided with a groove. The light is arranged in the groove.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The technology disclosed herein relates to impact tools. [Background technology]

[0002] In the technical field related to impact tools, there is known an illumination system for a power tool as disclosed in Patent Document 1. In Patent Document 1, the illumination system for a power tool has chip on board light emitting diodes (COB LEDs) as a light unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2016 / 0354889 Summary of the Invention [Problem to be solved by the invention]

[0004] The luminous intensity of the light emitted from the COB light is high. If at least a portion of the light emitted from the COB light is incident on the worker's eyes, the worker may feel dazzled, which may result in difficulty in visually recognizing the object of the work. In addition, if the COB light is provided on an impact tool, for example, if the impact tool is dropped and the COB light is subjected to an impact, the light-emitting performance of the COB light may be reduced.

[0005] The technology disclosed in this specification aims to prevent a worker from having difficulty in visually recognizing a work target. Also, the technology disclosed in this specification aims to protect a light and prevent a decrease in the light emission performance of the light. [Means for solving the problem]

[0006] This specification discloses an impact tool. The impact tool may include a motor, a hammer rotated by the motor, an anvil struck in the rotational direction by the hammer, a hammer case that houses the hammer, and a light that irradiates light onto a front end side of the anvil. A groove may be provided in the hammer case. The light may be disposed in the groove. The light may also be held by the hammer case. The hammer case may have a protrusion that is disposed on an outer circumferential side of the light. Effect of the Invention

[0007] According to the above configuration, it is possible to prevent the worker from having difficulty in visually recognizing the work target. Also, according to the above configuration, the light is protected and a decrease in the light emission performance of the light is prevented. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front perspective view showing an impact tool according to an embodiment. [Diagram 2] FIG. 2 is a side view showing an upper portion of the impact tool according to the embodiment. [Diagram 3] FIG. 3 is a vertical cross-sectional view showing an upper portion of the impact tool according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing an upper portion of the impact tool according to the embodiment. [Diagram 5] FIG. 5 is a cross-sectional view showing a part of the light unit according to the embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing a part of the light unit according to the embodiment. [Figure 7] FIG. 7 is an exploded perspective view from the front showing an upper portion of the impact tool according to the embodiment. [Figure 8] FIG. 8 is a perspective view showing the light unit according to the embodiment, seen from the front. [Figure 9] FIG. 9 is a perspective view showing the light unit according to the embodiment, seen from behind. [Figure 10]FIG. 10 is an exploded perspective view of the impact tool according to the embodiment, as viewed from the front. [Figure 11] FIG. 11 is a view of the light unit according to the embodiment as viewed from the front. [Figure 12] FIG. 12 is a front perspective view showing an upper portion of the impact tool according to the embodiment. [Figure 13] FIG. 13 is a rear perspective view showing an upper portion of the impact tool according to the embodiment. [Figure 14] FIG. 14 is a side view of the upper part of the impact tool according to the embodiment. [Figure 15] FIG. 15 is a vertical cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 16] FIG. 16 is an enlarged vertical cross-sectional view of a portion of the impact tool according to the embodiment. [Figure 17] FIG. 17 is a cross-sectional view showing an upper portion of the impact tool according to the embodiment. [Figure 18] FIG. 18 is a cross-sectional view showing an upper portion of the impact tool according to the embodiment. [Figure 19] FIG. 19 is an exploded perspective view from the front showing an upper portion of the impact tool according to the embodiment. [Figure 20] FIG. 20 is an exploded perspective view showing the bumper and the light unit according to the embodiment, as viewed from the rear. [Figure 21] FIG. 21 is an exploded view of the upper part of the impact tool according to the embodiment, seen from the front. [Figure 22] FIG. 22 is an enlarged vertical sectional view of a part of an impact tool according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In one or more embodiments, the impact tool may include a motor, a hammer rotated by the motor, an anvil struck by the hammer in the rotational direction, a hammer case that houses the hammer, and a light that irradiates light on the front end side of the anvil. A groove may be provided in the hammer case. The light may be disposed in the groove.

[0010] In the above configuration, since the light is disposed in the groove, the light emitted from the light to the front is irradiated onto the work object, and the light emitted from the light to the outer periphery is blocked by the hammer case. This prevents the light emitted from the light from entering the eyes of the worker. This prevents the worker from feeling dazzled. This prevents the worker from having difficulty in viewing the work object.

[0011] In one or more embodiments, the groove may be recessed rearwardly from the front end of the hammer case.

[0012] In the above configuration, the light emitted forward from the light is irradiated onto the work target in front of the hammer case.

[0013] In one or more embodiments, the groove may be disposed around the anvil.

[0014] In the above configuration, the groove is provided in an annular shape.

[0015] In one or more embodiments, the impact tool may include an optical member having a light transmitting portion disposed forward of the light. At least a portion of the optical member may be disposed in the groove.

[0016] In the above configuration, the light emitted forward from the light is irradiated to the work target in front of the hammer case through the light transmitting portion of the optical member. Since the optical member is disposed in the groove, the light emitted forward from the optical member is irradiated to the work target, and the light emitted to the outer periphery from the optical member is blocked by the hammer case.

[0017] In one or more embodiments, the light transmissive portion may be disposed in a groove.

[0018] In the above configuration, since the light-transmitting portion is positioned inside the groove, the light emitted forward from the optical member is irradiated onto the work object, and the light emitted toward the outer periphery from the optical member is blocked by the hammer case.

[0019] In one or more embodiments, the optical member may have an outer cylinder portion disposed on an outer periphery side of the light and an inner cylinder portion disposed on an inner periphery side of the light. Each of the outer cylinder portion and the inner cylinder portion may be disposed in a groove.

[0020] In the above configuration, the optical member is disposed so as to surround the light.

[0021] In one or more embodiments, the impact tool may include a motor, a hammer rotated by the motor, an anvil struck in the rotational direction by the hammer, a hammer case that houses the hammer, and a light that irradiates light on the front end side of the anvil. The light may be held in the hammer case. The hammer case may have a protrusion disposed on the outer periphery side of the light.

[0022] In the above configuration, even if the impact tool is dropped, the light is protected by the protrusion of the hammer case, which prevents the light from being damaged and prevents the light emission performance from decreasing.

[0023] In one or more embodiments, the protrusion may protrude forward beyond the light.

[0024] In the above configuration, the light is well protected by the protrusions.

[0025] In one or more embodiments, the protrusions may be disposed around the anvil.

[0026] In the above configuration, the protrusion is provided in an annular shape.

[0027] In one or more embodiments, the light may include a substrate and an LED chip mounted on a front surface of the substrate. The substrate may be disposed around the anvil.

[0028] In the above configuration, an annular light is provided on the impact tool.

[0029] In one or more embodiments, the impact tool may include an optical member having a light transmitting portion disposed forward of the light. The protrusion may be disposed on an outer periphery of the optical member.

[0030] In the above configuration, the light and the optical members are each protected by the protrusion.

[0031] In one or more embodiments, the exit surface of the light transmitting portion may be located at the same position as the front end surface of the protrusion or rearward of the front end surface of the protrusion.

[0032] In the above configuration, the optical member is sufficiently protected by the protrusion.

[0033] In one or more embodiments, the anvil may have an anvil shaft portion disposed on the inner peripheral side of the optical member. The hammer case may have a front cylindrical portion disposed around the anvil shaft portion. The impact tool may include a snap ring disposed in a snap ring groove provided in the front cylindrical portion. The snap ring may support the optical member from the front side.

[0034] In the above-described configuration, the optical member and the light are prevented from slipping out forward from the hammer case. The snap ring functions as a retaining member that prevents the optical member and the light from slipping out forward.

[0035] In one or more embodiments, the optical member may have an inner circumferential protrusion disposed on the inner circumferential side of the light transmitting portion and disposed forward of the exit surface of the light transmitting portion. The snap ring may support the inner circumferential protrusion.

[0036] In the above-described configuration, the optical member is stably supported from the front side by the snap ring disposed in the snap ring groove.

[0037] In one or more embodiments, the optical member may have a stop portion that supports an end of the snap ring.

[0038] In the above-described configuration, the snap ring is prevented from rotating relative to the hammer case and the optical member, and the stopper portion functions as a rotation preventing member that prevents the snap ring from rotating.

[0039] In one or more embodiments, the impact tool may include a buffer member disposed between the rear surface of the light and the hammer case.

[0040] In the above-mentioned configuration, for example, when the impact tool is dropped, the shock applied to the light is mitigated. Since the light is sandwiched between the buffer member and the snap ring from the front and rear directions, the relative position between the light and the hammer case is prevented from changing.

[0041] In one or more embodiments, the optical member may have a protruding portion disposed below the light transmitting portion. The impact tool may include a housing fixed to a rear portion of the hammer case and accommodating the motor. The housing may have a cover portion covering the protruding portion from the front side.

[0042] In the above configuration, the lead wire connected to the light is supported by the protrusion. The protrusion is protected by the cover. Even if at least a portion of the light emitted from the light is incident on the protrusion, the light emitted from the protrusion is blocked by the cover.

[0043] In one or more embodiments, the hammer case may have an opposing surface that faces the upper surface of the cover portion. The opposing surface may be provided so as to extend in the left-right direction.

[0044] In the above-described configuration, when the housing is a so-called split housing consisting of a left housing and a right housing, the left housing and the right housing can be smoothly fixed together using the opposing surfaces.

[0045] In one or more embodiments, the impact tool may include a housing secured to a rear of the hammer case by a screw and housing the motor. The hammer case may have a screw boss that is coupled to the screw. At least a portion of the housing may be disposed to cover the screw boss.

[0046] In the above-described configuration, the screw boss portion of the hammer case is protected by the housing, and the hand of an operator gripping the grip portion of the housing is prevented from directly touching the hammer case.

[0047] In one or more embodiments, the anvil may have an anvil shaft portion disposed radially inwardly of the optical member. The impact tool may include an anvil bearing held in the hammer case and rotatably supporting the anvil shaft portion. A front end of the hammer may be disposed forward of a rear end of the anvil bearing.

[0048] In the above-described configuration, the hammer case and the anvil bearing overlap, which prevents the impact tool from becoming large in size, and reduces the length of the upper part of the impact tool in the front-rear direction (the so-called overall length).

[0049] In one or more embodiments, the light may be a COB light.

[0050] In the above configuration, light with high luminous intensity is emitted from the light.

[0051] Hereinafter, an embodiment will be described with reference to the drawings. In the embodiment, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate a relative position or direction based on the center of the impact tool.

[0052] [First embodiment] A first embodiment will be described.

[0053] <Impact tools> Fig. 1 is a front perspective view showing an impact tool 1 according to an embodiment. Fig. 2 is a side view showing an upper part of the impact tool 1 according to an embodiment. Fig. 3 is a vertical cross-sectional view showing an upper part of the impact tool 1 according to an embodiment. Fig. 4 is a horizontal cross-sectional view showing an upper part of the impact tool 1 according to an embodiment.

[0054] In the embodiment, the impact tool 1 is an electric tool having an electric motor 6 as a power source. A direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as an axial direction, a direction going around the rotation axis AX is appropriately referred to as a circumferential direction or a rotation direction, and a radial direction of the rotation axis AX is appropriately referred to as a radial direction. In addition, in the radial direction, a position close to or approaching the rotation axis AX is appropriately referred to as a radially inner side or an inner circumferential side, and a position far from or away from the rotation axis AX is appropriately referred to as a radially outer side or an outer circumferential side. In the embodiment, the rotation axis AX extends in the front-rear direction. One axial side is the front side (forward), and the other axial side is the rear side (rear).

[0055] In the embodiment, the impact tool 1 is an impact wrench. The impact tool 1 includes a housing 2, a rear cover 3, a hammer case 4, a screw 5, a motor 6, a reduction mechanism 7, a spindle 8, a striking mechanism 9, an anvil 10, a fan 12, a battery mounting portion 13, a trigger lever 14, a forward / reverse rotation switching lever 15, a snap ring 16, a seal member 17, and a light unit 18.

[0056] The housing 2 is made of synthetic resin. In this embodiment, the housing 2 is made of nylon. The housing 2 includes a left housing 2L and a right housing 2R disposed to the right of the left housing 2L. The left housing 2L and the right housing 2R are fixed together by a plurality of screws 2S. The housing 2 is composed of a pair of half housings.

[0057] The housing 2 has a motor accommodating portion 21, a grip portion 22, and a battery holding portion 23.

[0058] The motor accommodating portion 21 is cylindrical and accommodates the motor 6, a part of the bearing box 24, and the rear part of the hammer case 4. The motor accommodating portion 21 is provided with a screw boss portion 2H.

[0059] The grip portion 22 protrudes downward from the motor housing portion 21. The trigger lever 14 is provided on an upper portion of the grip portion 22. The grip portion 22 is held by an operator.

[0060] The battery holding portion 23 is connected to a lower end portion of the grip portion 22. The outer dimensions of the battery holding portion 23 are larger than the outer dimensions of the grip portion 22 in both the front-rear direction and the left-right direction.

[0061] The rear cover 3 is made of synthetic resin. The rear cover 3 is disposed rearward of the motor accommodating portion 21. The rear cover 3 accommodates at least a portion of the fan 12. The fan 12 is disposed on the inner peripheral side of the rear cover 3. The rear cover 3 is disposed so as to cover an opening at the rear end portion of the motor accommodating portion 21. The rear cover 3 is fixed to the rear end portion of the motor accommodating portion 21 with screws 3S.

[0062] The motor accommodating portion 21 has an air intake port 19. The rear cover 3 has an air exhaust port 20. Air in the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 19. Air in the internal space of the housing 2 flows out to the external space of the housing 2 through the air exhaust port 20.

[0063] The hammer case 4 functions as a gear case that houses the reduction mechanism 7. The hammer case 4 houses the reduction mechanism 7. The hammer case 4 houses the spindle 8. The hammer case 4 houses the striking mechanism 9. The hammer case 4 houses a part of the anvil 10. The hammer case 4 is made of metal. In the embodiment, the hammer case 4 is made of aluminum. The hammer case 4 is cylindrical.

[0064] The hammer case 4 includes a rear cylinder portion 4A, a front cylinder portion 4B, an annular portion 4C, and a screw boss portion 4H. The front cylinder portion 4B is disposed forward of the rear cylinder portion 4A. The outer diameter of the rear cylinder portion 4A is larger than the outer diameter of the front cylinder portion 4B. The inner diameter of the rear cylinder portion 4A is larger than the inner diameter of the front cylinder portion 4B. The annular portion 4C is disposed to connect the front end portion of the rear cylinder portion 4A and the rear end portion of the front cylinder portion 4B.

[0065] The hammer case 4 is connected to the front of the motor housing 21. The motor housing 21 is fixed to the rear of the hammer case 4 by the screw 5. The screw 5 is inserted from the rear of the screw boss 2H into an opening provided in the screw boss 2H, and then inserted into a screw hole provided in the screw boss 4H. Four screw bosses 2H and 4H are provided in the circumferential direction. Four screws 5 are provided in the circumferential direction. As shown in FIG. 2, the screw 2S and the screw 5 overlap in the front-rear direction and the up-down direction. Therefore, the screw 2S cannot be removed before the screw 5 is removed. The screw 2S can be removed after the screw 5 is removed. After the left housing 2L and the right housing 2R are fixed by the screw 2S, the hammer case 4 and the motor housing 21 are fixed by the screw 5.

[0066] A bearing box 24 is fixed to the rear of the rear cylinder portion 4A. At least a part of the reduction gear mechanism 7 is disposed inside the bearing box 24. 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 rear cylinder portion 4A are housed in the motor accommodating portion 21. The bearing box 24 is fixed to both the motor accommodating portion 21 and the hammer case 4.

[0067] The motor 6 is a power source of the impact tool 1. The motor 6 generates a rotational force. The motor 6 is an electric motor. 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 by the motor accommodating 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 about a rotation axis AX extending in the front-rear direction.

[0068] The stator 26 includes a stator core 28 , a front insulator 29 , a rear insulator 30 , and a coil 31 .

[0069] 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.

[0070] The front insulator 29 is provided at the front of the stator core 28. The rear insulator 30 is provided at the rear of the stator core 28. The front insulator 29 and the rear insulator 30 are each an electrical insulating member made of synthetic resin. The front insulator 29 is disposed so as to cover a portion of the surface of the teeth. The rear insulator 30 is disposed so as to cover a portion of the surface of the teeth.

[0071] The coil 31 is attached to the stator core 28 via the front insulator 29 and the rear insulator 30. A plurality of coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulator 29 and the rear insulator 30. The coils 31 and the stator core 28 are electrically insulated by the front insulator 29 and the rear insulator 30. The multiple coils 31 are connected via fusing terminals 38.

[0072] The rotor 27 rotates about a rotation axis AX. The rotor 27 has a rotor core portion 32, a rotor shaft portion 33, a rotor magnet , and a sensor magnet .

[0073] Each of the rotor core portion 32 and the rotor shaft portion 33 is made of steel. In the embodiment, the rotor core portion 32 and the rotor shaft portion 33 are integral with each other. A front portion of the rotor shaft portion 33 protrudes forward from a front end surface of the rotor core portion 32. A rear portion of the rotor shaft portion 33 protrudes rearward from a rear end surface of the rotor core portion 32.

[0074] The rotor magnet 34 is fixed to the rotor core portion 32. The rotor magnet 34 is cylindrical. The rotor magnet 34 is disposed around the rotor core portion 32.

[0075] The sensor magnet 35 is fixed to the rotor core portion 32. The sensor magnet 35 is annular. The sensor magnet 35 is disposed on the front end surface of the rotor core portion 32 and the front end surface of the rotor magnet .

[0076] 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 an annular circuit board and a magnetic sensor supported by the circuit board. At least a portion of the sensor board 37 faces the sensor magnet 35. The magnetic sensor detects the position of the sensor magnet 35, thereby detecting the position of the rotor 27 in the rotational direction.

[0077] A rear portion of the rotor shaft portion 33 is rotatably supported by a rotor bearing 39. A front portion of the rotor bearing 39 is rotatably supported by a rotor bearing 40. The rotor bearing 39 is held by the rear cover 3. The rotor bearing 40 is held by the bearing box 24. The front end portion of the rotor shaft portion 33 is disposed in the internal space of the hammer case 4 through an opening of the bearing box 24.

[0078] A pinion gear 41 is formed on the front end of the rotor shaft portion 33. The pinion gear 41 is connected to at least a part of the reduction mechanism 7. The rotor shaft portion 33 is connected to the reduction mechanism 7 via the pinion gear 41.

[0079] The reduction mechanism 7 transmits the rotational force of the motor 6 to the spindle 8 and the anvil 10. The reduction mechanism 7 is housed in the rear cylinder portion 4A of the hammer case 4. The reduction mechanism 7 has a plurality of gears. The reduction mechanism 7 is disposed forward of the motor 6. The reduction mechanism 7 connects the rotor shaft portion 33 and the spindle 8. The gears of the reduction mechanism 7 are driven by the rotor 27. The reduction mechanism 7 transmits the rotation of the rotor 27 to the spindle 8. The reduction mechanism 7 rotates the spindle 8 at a rotational speed lower than the rotational speed of the rotor shaft portion 33. The reduction mechanism 7 includes a planetary gear mechanism.

[0080] The reduction mechanism 7 has a plurality of planetary gears 42 arranged around the pinion gear 41, and an internal gear 43 arranged around the plurality of planetary gears 42. The pinion gear 41, the planetary gear 42, and the internal gear 43 are 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 by the spindle 8 via a pin 42P. The spindle 8 is rotated by the planetary gear 42. The internal gear 43 has internal teeth that mesh with the planetary gear 42. The internal gear 43 is fixed to the bearing box 24. The internal gear 43 is always non-rotatable with respect to the bearing box 24.

[0081] When the rotor shaft portion 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 portion 33.

[0082] The spindle 8 rotates due to the rotational force of the motor 6. The spindle 8 is disposed forward of at least a portion of the motor 6. The spindle 8 is disposed forward of the stator 26. At least a portion of the spindle 8 is disposed forward of the rotor 27. At least a portion of the spindle 8 is disposed in front of the reduction mechanism 7. The spindle 8 is rotated by the rotor 27. The spindle 8 rotates due to the rotational force of the rotor 27 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 and the rotation axis AX of the motor 6 coincide with each other. The spindle 8 rotates about the rotation axis AX.

[0084] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is held in the bearing box 24. The spindle 8 has an annular portion 8C protruding rearward from the rear of the flange portion 8A. The spindle bearing 44 is disposed inside the annular portion 8C. In the embodiment, an outer ring of the spindle bearing 44 is connected to the annular portion 8C, and an inner ring of the spindle bearing 44 is supported by the bearing box 24.

[0085] The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the reduction mechanism 7 and the 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 the hammer case 4.

[0086] The hammer 47 is disposed forward of the reduction mechanism 7. The hammer 47 is housed in the rear cylinder portion 4A. The hammer 47 is disposed around the spindle shaft portion 8B. The hammer 47 is held by the spindle shaft portion 8B. The ball 48 is disposed between the spindle shaft portion 8B and the hammer 47. The coil spring 49 is supported by each of the flange portion 8A and the hammer 47.

[0087] The hammer 47 has an annular body portion 47D, a rear outer cylinder portion 47E protruding rearward from the outer periphery of the body portion 47D, a front outer cylinder portion 47F protruding forward from the outer periphery of the body portion 47D, an inner cylinder portion 47G protruding rearward from the inner periphery of the body portion 47D, a hammer groove 47A, and a hammer protrusion portion 47B. The body portion 47D is disposed around the spindle shaft portion 8B. The body portion 47D is annular. The rear outer cylinder portion 47E and the inner cylinder portion 47G each protrude rearward from the body portion 47D. A recess 47C is defined by the rear surface of the body portion 47D, the inner peripheral surface of the rear outer cylinder portion 47E, and the outer peripheral surface of the inner cylinder portion 47G. The recess 47C is provided so as to be recessed forward from the rear end portion of the hammer 47. The recess 47C is ring-shaped. The hammer protrusion 47B protrudes forward from the body portion 47D. The hammer protrusion 47B protrudes radially inward from the inner circumferential surface of the front outer cylinder portion 47F. Two hammer protrusions 47B are provided. Since the rear outer cylinder portion 47E and the front outer cylinder portion 47F are provided, the inertial force of the hammer 47 in the rotation direction becomes large.

[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 part of the ball 48 is disposed. The spindle groove 8D is provided on a part of the outer circumferential surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47A in which at least a part of the ball 48 is disposed. The hammer groove 47A is provided on a part of the inner surface of the inner cylinder portion 47G. The ball 48 is disposed between the spindle groove 8D and the hammer groove 47A. The ball 48 can roll on the inside of the spindle groove 8D and the inside of the hammer groove 47A. The hammer 47 can move along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial direction and the rotational direction within a movable range defined by the spindle groove 8D and the hammer groove 47A.

[0090] The coil spring 49 generates an elastic force that moves the hammer 47 forward. In the embodiment, the coil spring 49 includes a first coil spring 49A and a second coil spring 49B that is arranged in parallel with the first coil spring 49A. The coil spring 49 is arranged 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 washer 45 is supported by the body portion 47D via a ball 11. The ball 11 is arranged in a ball groove 47H provided on the rear surface of the body portion 47D. The rear end of the coil spring 49 is supported by the flange portion 8A. The front end of the coil spring 49 is arranged inside the recess 47C and supported by the washer 45.

[0091] The anvil 10 is an output part of the impact tool 1 that is actuated by the rotational force of the motor 6. The anvil 10 is rotated by the rotational force of the motor 6. At least a part of the anvil 10 is disposed forward of the hammer 47.

[0092] The anvil 10 has a rod-shaped anvil shaft portion 10C and an anvil protrusion portion 10D. The outer shape of the anvil shaft portion 10C perpendicular to the rotation axis AX is substantially rectangular. A socket, which is a tip tool, is attached to the anvil shaft portion 10C. In addition, a recess 10B is provided at the rear end of the anvil 10. A protrusion is provided at the front end of the spindle shaft portion 8B. The protrusion 8E at the front end of the spindle shaft portion 8B is inserted into the recess 10B provided at the rear end of the anvil 10. The anvil protrusion portion 10D is provided at the rear end of the anvil 10. The anvil protrusion portion 10D protrudes radially outward from the rear end of the anvil shaft portion 10C. Two grease grooves 8F are provided in the protrusion portion 8E.

[0093] The anvil 10 is rotatably supported by the anvil 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 coincident. The anvil 10 rotates around the rotation axis AX. The anvil bearing 46 is disposed inside the front cylinder portion 4B. The anvil bearing 46 is held by the front cylinder portion 4B of the hammer case 4. The front cylinder portion 4B is disposed around the anvil shaft portion 10C. The anvil bearing 46 rotatably supports the anvil shaft portion 10C. In the embodiment, the anvil bearing 46 includes an outer sleeve 46A and an inner sleeve 46B disposed on the inner peripheral side of the outer sleeve 46A.

[0094] The hammer protrusion 47B can come into contact with the anvil protrusion 10D. When the motor 6 is driven in a state in which the hammer protrusion 47B and the anvil protrusion 10D are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0095] The anvil 10 is struck in the rotational direction by the hammer 47. For example, in a screw tightening operation, when the load acting on the anvil 10 becomes high, a situation may occur in which the anvil 10 cannot be rotated by the power generated by the motor 6 alone. When the anvil 10 cannot be rotated by the power generated by the motor 6 alone, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 can move relatively in the axial direction and the circumferential direction via the ball 48. Even if the rotation of the hammer 47 stops, the rotation of the spindle 8 continues by the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the ball 48 moves backward while being guided by each of the spindle groove 8D and the hammer groove 47A. The hammer 47 receives a force from the ball 48 and moves backward along with the ball 48. That is, the hammer 47 moves backward by the rotation of the spindle 8 while the rotation of the anvil 10 is stopped. As the hammer 47 moves rearward, the contact between the hammer projection 47B and the anvil projection 10D is released.

[0096] The coil spring 49 generates an elastic force that moves the hammer 47 forward. The hammer 47 that has moved backward moves forward due to the elastic force of the coil spring 49. When the hammer 47 moves forward, it receives a force in the rotational direction from the ball 48. That is, the hammer 47 moves forward while rotating. When the hammer 47 moves forward while rotating, the hammer protrusion 47B comes into contact with the anvil protrusion 10D while rotating. As a result, the anvil protrusion 10D is struck in the rotational direction by the hammer protrusion 47B. Both the power of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. Therefore, the anvil 10 can rotate around the rotation axis AX with high torque.

[0097] The fan 12 rotates due to the rotational force of the motor 6. The fan 12 is disposed behind the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is fixed to at least a part of the rotor 27. The fan 12 is fixed to the rear part of the rotor shaft part 33 via a bush 12A. The fan 12 is disposed between the rotor bearing 39 and the stator 26. The fan 12 rotates due to the rotation of the rotor 27. As the rotor shaft part 33 rotates, the fan 12 rotates together with the rotor shaft part 33. As the fan 12 rotates, air in the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. The air that has flowed into the internal space of the housing 2 circulates through the internal space of the housing 2, 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 through the exhaust port 20 into the external space of the housing 2.

[0098] The battery mounting section 13 is disposed below the battery holding section 23. The battery pack 25 is mounted to the battery mounting section 13. The battery pack 25 is detachable from the battery mounting section 13. The battery pack 25 functions as a power source for the impact tool 1. The battery pack 25 includes a secondary battery. In the embodiment, the battery pack 25 includes a rechargeable lithium-ion battery. When mounted to the battery mounting section 13, the battery pack 25 can supply power to the impact tool 1. The motor 6 and the light unit 18 are each driven based on the power supplied from the battery pack 25.

[0099] The trigger lever 14 is provided on the grip portion 22. The trigger lever 14 is operated by an operator to start the motor 6. By operating the trigger lever 14, the motor 6 is switched between being driven and being stopped.

[0100] 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.

[0101] <Light unit> Fig. 5 and Fig. 6 are cross-sectional views showing a part of the light unit 18 according to the embodiment. Fig. 5 is a cross-sectional view of the upper part of the light unit 18. Fig. 6 is a cross-sectional view of the lower part of the light unit 18. Fig. 7 is an exploded perspective view of the upper part of the impact tool 1 according to the embodiment, seen from the front. Fig. 8 is a perspective view of the light unit 18 according to the embodiment, seen from the front. Fig. 9 is a perspective view of the light unit 18 according to the embodiment, seen from the rear. Fig. 10 is an exploded perspective view of the impact tool 1 according to the embodiment, seen from the front. Fig. 11 is a view of the light unit 18 according to the embodiment, seen from the front.

[0102] The light unit 18 emits illumination light. The light unit 18 illuminates the anvil 10 and the periphery of the anvil 10 with the illumination light. The light unit 18 illuminates the front end side of the anvil 10 with the illumination light.

[0103] The light unit 18 is disposed in the front part of the hammer case 4. The light unit 18 is disposed around the front cylinder portion 4B. The light unit 18 is disposed around the anvil shaft portion 10C via the front cylinder portion 4B.

[0104] The light unit 18 includes a light 50. In this embodiment, the light 50 includes chip on board light emitting diodes (COB LEDs). In the following description, the light 50 will be referred to as a COB light 50 as appropriate. The COB light 50 irradiates light onto the front end side of the anvil 10.

[0105] The COB light 50 has a substrate 51, an LED chip 52 which is a light-emitting element, a bank 54, and a phosphor 55. Examples of the substrate 51 include an aluminum substrate, a glass cloth-based epoxy resin substrate (FR-4 substrate), and a composite substrate epoxy resin substrate (CEM-3 substrate). The LED chip 52 is mounted on the surface of the substrate 51. The LED chip 52 and the substrate 51 are connected via gold wires (not shown). The gold wires connect the LED chips 52 to each other. The bank 54 is provided on the surface of the substrate 51. The bank 54 is disposed around the LED chip 52. The bank 54 is disposed radially inward and radially outward from the LED chip 52. The bank 54 defines a partitioned space in which the phosphor 55 is disposed. The phosphor 55 is disposed so as to cover the LED chip 52 inside the bank 54. A pair of electrodes (not shown) are disposed on the surface (front) of the substrate 51 outside the bank 54. The electrodes may be disposed on the back surface (rear surface) of the substrate 51. Of the pair of electrodes, one electrode is a positive electrode and the other electrode is a negative electrode. Power output from the battery pack 25 is supplied to the electrodes. The power supplied to the electrodes is supplied to the LED chip 52 via the substrate 51 and the gold wires. The LED chip 52 emits light based on the power supplied from the battery pack 25. The voltage of the battery pack 25 is stepped down to 5V by a controller (not shown) and applied to the LED chip 52. The controller is housed in the battery holding section 23. The light unit 18 and the controller are connected via lead wires 180.

[0106] The light unit 18 includes a COB light 50 and an optical member 57. The chip-on-board light emitting diode 50 includes a substrate 51, a plurality of LED chips 52, a bank 54, and a phosphor 55.

[0107] The substrate 51 is annular. The substrate 51 is disposed around the anvil shaft portion 10C via the front cylinder portion 4B. The substrate 51 has an annular portion 51A and a support portion 51B that protrudes downward from a lower portion of the annular portion 51A. The substrate 51 is disposed so as to surround the anvil shaft portion 10C.

[0108] The LED chip 52 is mounted on the front surface of the annular portion 51A of the substrate 51. The LED chip 52 is disposed on at least a portion of the periphery of the anvil shaft portion 10C via the front cylinder portion 4B. A plurality of LED chips 52 are disposed at intervals in the circumferential direction of the annular portion 51A. In the embodiment, 24 LED chips 52 are disposed at equal intervals in the circumferential direction of the annular portion 51A.

[0109] The bank 54 is provided on the front surface of the annular portion 51A of the substrate 51. The bank 54 protrudes forward from the front surface of the annular portion 51A. The bank 54 defines a partitioned space in which the phosphor 55 is disposed. The bank 54 is annular. In the embodiment, the bank 54 is provided to have a double annular shape. That is, in the embodiment, the bank 54 includes a first annular bank 54 provided on the front surface of the annular portion 51A and a second annular bank 54 provided on the front surface of the annular portion 51A radially outward from the first bank 54. The first bank 54 is disposed radially inward from the LED chip 52. The second bank 54 is disposed radially outward from the LED chip 52. The LED chips 52 are disposed between the first bank 54 and the second bank 54.

[0110] The phosphor 55 is disposed on the front surface of the annular portion 51A of the substrate 51. The phosphor 55 is annular. The phosphor 55 is disposed between the first bank 54 and the second bank 54 so as to cover each of the LED chips 52.

[0111] A pair of lead wires (not shown) are connected to the substrate 51. The electrodes described above are connected to the lead wires. The pair of lead wires are supported on the rear surface of the support portion 51B. The lead wires may also be supported on the front surface of the support portion 51B.

[0112] The current output from the battery pack 25 is supplied to the electrodes via a controller (not shown) and lead wires 180. The voltage of the battery pack 25 is stepped down by the controller (not shown) and then applied to the electrodes. The current supplied to the electrodes is supplied to the LED chip 52 via the substrate 51 and gold wires. The LED chip 52 emits light based on the current supplied from the battery pack 25.

[0113] The optical member 57 is connected to the COB light 50. The optical member 57 is fixed to the substrate 51. The optical member 57 is made of polycarbonate resin. In the embodiment, the optical member 57 is made of polycarbonate resin containing a white diffusing material. The optical member 57 is milky white. The light transmittance of the optical member 57 is 40% or more and 70% or less. Since the optical member 57 is milky white, the outer shape of the LED chip 52 is difficult to see from the outside of the impact tool 1. Since the outer shape of the LED chip 52 is difficult to see, the design of the impact tool 1 is improved.

[0114] At least a portion of the optical member 57 is disposed forward of the COB light 50. The optical member 57 has an outer cylinder portion 57A, an inner cylinder portion 57B, a light transmitting portion 57C, a convex portion 57D, an inner peripheral side convex portion 57G, a stopper portion 57H, and a concave portion 57J.

[0115] The outer cylinder portion 57A is disposed radially outward of the inner cylinder portion 57B. The outer cylinder portion 57A is disposed on the outer periphery of the COB light 50. The outer cylinder portion 57A is disposed radially outward of the LED chip 52. In the radial direction, the COB light 50 is disposed between the outer cylinder portion 57A and the inner cylinder portion 57B. The outer cylinder portion 57A is disposed radially outward of the annular portion 51A of the substrate 51. The inner cylinder portion 57B is disposed on the inner periphery of the COB light 50. The inner cylinder portion 57B is disposed radially inward of the annular portion 51A of the substrate 51. The inner cylinder portion 57B is disposed radially inward of the LED chip 52.

[0116] The light transmitting portion 57C is disposed forward of the COB light 50. The light transmitting portion 57C is annular. The light transmitting portion 57C is disposed forward of the LED chip 52. The light transmitting portion 57C is disposed so as to connect the front end of the outer tube portion 57A and the front end of the inner tube portion 57B. The light transmitting portion 57C faces the front surface of the annular portion 51A. The light transmitting portion 57C faces the LED chip 52. The light emitted from the LED chip 52 passes through the light transmitting portion 57C and is irradiated forward of the light unit 18.

[0117] The light transmitting portion 57C has an incident surface 57E through which light from the LED chip 52 enters, and an exit surface 57F through which light transmitted through the light transmitting portion 57C exits. The front surface of the annular portion 51A faces the incident surface 57E of the light transmitting portion 57C. The incident surface 57E faces the LED chip 52. The incident surface 57E faces substantially backward. The exit surface 57F faces substantially forward.

[0118] The protrusion is disposed below the light transmitting portion 57C. The protrusion 57D is provided so as to protrude downward from the lower portion of the outer cylinder portion 57A. An accommodation space is formed in the upper portion of the rear surface of the protrusion 57D. The support portion 51B of the substrate 51 is disposed in an accommodation section formed in the upper portion of the rear surface of the protrusion 57D. The protrusion 57D can support the above-mentioned lead wire 180 extending from the substrate 51.

[0119] The inner circumferential side convex portion 57G is disposed on the inner circumferential side of the light transmitting portion 57C. The inner circumferential side convex portion 57G protrudes forward from the inner circumferential side of the light transmitting portion 57C. The inner circumferential side convex portion 57G is disposed forward of the emission surface 57F of the light transmitting portion 57C. The inner circumferential side convex portion 57G is annular.

[0120] The stopper portion 57H protrudes forward from the lower portion of the inner circumferential convex portion 57G. Two stopper portions 57H are provided on the lower portion of the inner circumferential convex portion 57G. The two stopper portions 57H are arranged with a gap between them in the left-right direction. The support portion 51B of the substrate 51 is arranged in a recess 57J provided at the rear of the optical member 57. The support portion 51B fits into the recess 57J, thereby positioning the substrate 51 with respect to the optical member 57 and suppressing relative rotation between the substrate 51 and the optical member 57.

[0121] The rear surface of the substrate 51 is disposed forward of the rear end of the outer tube 57A and the rear end of the inner tube 57B. The rear surface of the substrate 51 and at least a part of the inner peripheral surface of the outer tube 57A are fixed with an adhesive. The rear surface of the substrate 51 and at least a part of the outer peripheral surface of the inner tube 57B are fixed with an adhesive. The COB light 50 and the optical member 57 are fixed.

[0122] The hammer case 4 has a protrusion 4D disposed on the outer periphery side of the COB light 50. The protrusion 4D protrudes forward from the COB light 50. The protrusion 4D is substantially annular. The protrusion 4D is provided so as to surround the anvil shaft portion 10C. The protrusion 4D is disposed on the outer periphery side of the optical member 57. In the front-rear direction, the exit surface 57F of the light transmitting portion 57C is disposed at the same position as the front end surface of the protrusion 4D. That is, the exit surface 57F and the front end surface of the protrusion 4D are flush with each other. Note that, in the front-rear direction, the exit surface 57F of the light transmitting portion 57C may be disposed rearward of the front end surface of the protrusion 4D.

[0123] A groove 4E is provided in the hammer case 4 on the inner peripheral side of the protrusion 4D. The groove 4E is provided so as to recess rearward from the front end portion of the hammer case 4. In the radial direction, the groove 4E is provided between the front side cylindrical portion 4B and the protrusion 4D. The groove 4E is provided so as to surround the anvil shaft portion 10C.

[0124] The COB light 50 is disposed inside the groove 4E. At least a portion of the optical member 57 is disposed inside the groove 4E. The light transmitting portion 57C is disposed inside the groove 4E. The outer cylinder portion 57A and the inner cylinder portion 57B are disposed inside the groove 4E. The inner circumferential side protrusion portion 57G is disposed forward of the front end portion of the groove 4E.

[0125] The snap ring 16 is disposed in a snap ring groove 4F provided in the front cylinder portion 4B. The snap ring groove 4F is provided forward of the front end surface of the protrusion 4D and the emission surface 57F of the light transmitting portion 57C. The snap ring 16 supports the optical member 57 from the front side. In the embodiment, the snap ring 16 supports the inner peripheral side protrusion 57G from the front side.

[0126] The stopper portion 57H supports an end of the snap ring 16. The snap ring 16 has two ends. The left end of the snap ring 16 is supported by the left stopper portion 57H of the two stopper portions 57H. The right end of the snap ring 16 is supported by the right stopper portion 57H of the two stopper portions 57H. The left end of the snap ring 16 contacts the left surface of the left stopper portion 57H. The right end of the snap ring 16 contacts the right surface of the right stopper portion 57H. The stopper portion 57H prevents the snap ring 16 from rotating relative to the optical member 57.

[0127] A buffer member 80 is disposed behind the COB light 50. In the embodiment, the buffer member 80 is a sponge ring. The buffer member 80 is disposed between the rear surface of the COB light 50 and the hammer case 4. The rear surface of the buffer member 80 contacts the front surface of the annular portion 4C of the hammer case 4. The front surface of the buffer member 80 contacts the rear surface of the substrate 51 of the COB light 50. The buffer member 80 is disposed between the rear surface of the COB light 50 and the hammer case 4 in a compressed state. As described above, the substrate 51 and the optical member 57 are fixed by an adhesive. The snap ring 16 supports the optical member 57 and the COB light 50 from the front side so that the buffer member 80 is compressed. The optical member 57 and the COB light 50 are sandwiched between the buffer member 80 and the snap ring 16 in the front-rear direction. In the embodiment, the optical member 57 and the hammer case 4 are separated. The COB light 50 and the hammer case 4 are separated. The COB light 50 and the optical member 57 are held in the hammer case 4 via a buffer member 80 and a snap ring 16, respectively.

[0128] <Hammer case and housing> The anvil shaft portion 10C is disposed on the inner peripheral side of the optical member 57. The anvil bearing 46 is held by the hammer case 4 and rotatably supports the anvil shaft portion 10C. The anvil bearing 46 is insert molded into the hammer case 4. In the embodiment, the front end portion of the front outer cylinder portion 47F of the hammer 47 is disposed forward of the rear end portion of the anvil bearing 46. That is, at least a portion of the hammer 47 and the anvil bearing 46 overlap in the front-rear direction. The seal member 17 is prevented from coming off by the front cylinder portion 4B.

[0129] As shown in FIG. 5, the hammer case 4 has a protruding portion 4K protruding rearward from the rear surface of the annular portion 4C. The outer sleeve 46A has a flange portion 46C extending radially outward from the rear end of the outer sleeve 46A. The front end of the front outer cylinder portion 47F is disposed forward of the rear end of the protruding portion 4K. Also, the front end of the front outer cylinder portion 47F is disposed forward of the rear end of the flange portion 46C. That is, in the front-rear direction, the front end of the front outer cylinder portion 47F overlaps with the protruding portion 4K and the flange portion 46C. This increases the inertial force of the hammer 47. Also, since the flange portion 46C hits the anvil protrusion portion 10D, the protruding portion 4K is prevented from being scraped by the anvil protrusion portion 10D. Also, the snap ring 16 and the seal member 17 overlap in the front-rear direction. Since the seal member 17 is disposed rearward, the dimension of the impact tool 1 in the front-rear direction is prevented from becoming long.

[0130] The motor accommodating section 21 is disposed so as to cover the lower two screw boss sections 4H among the four screw boss sections 4H. The housing 2 has a cover section 21C that covers the convex section 57D of the optical member 57 from the front side. Even if at least a part of the light emitted from the COB light 50 enters the convex section 57D, the light emitted from the convex section 57D is blocked by the cover section 21C. That is, the leakage of light from the convex section 57D is suppressed by the cover section 21C.

[0131] As shown in FIG. 11, the hammer case 4 has an opposing surface 4J that faces the upper surface 21D of the cover portion 21C. The opposing surface 4J includes a left opposing surface 4J that faces the upper surface 21D of the cover portion 21C of the left housing 2L, and a right opposing surface 4J that faces the upper surface 21D of the cover portion 21C of the right housing 2R. In a plane perpendicular to the rotation axis AX, the opposing surface 4J is provided so as to extend in the left-right direction. In a plane perpendicular to the rotation axis AX, the opposing surface 4J is linear. As shown in FIG. 10, the housing 2 includes the left housing 2L and the right housing 2R. When the left housing 2L and the right housing 2R are joined, the left housing 2L and the right housing 2R can be aligned by bringing the upper surface 21D into contact with the opposing surface 4J. This allows the left housing 2L and the right housing 2R to be smoothly fixed using the opposing surface 4J.

[0132] <How to use> When the trigger lever 14 is operated by an operator, the motor 6 is started and light is emitted from the LED chip 52 of the COB light 50. The light emitted from the COB light 50 has a high luminous intensity and can brightly illuminate the work target.

[0133] On the other hand, if at least a part of the light emitted from the LED chip 52 passes through the outer tube portion 57A, when the light emitted from the outer circumferential surface of the outer tube portion 57A enters the worker's eyes, the worker may feel dazzled, and as a result, the worker may have difficulty in viewing the work target. In the embodiment, the light emitted from the outer circumferential surface of the outer tube portion 57A is blocked by the protrusion portion 4D. The protrusion portion 4D prevents the worker from feeling dazzled.

[0134] Furthermore, even if the impact tool 1 is dropped, for example, the COB light 50 is protected by the protrusion 4D of the hammer case 4. This prevents the COB light 50 from being damaged, and prevents the light emission performance of the COB light 50 from being deteriorated.

[0135] <Effects> As described above, in the embodiment, the impact tool 1 includes the motor 6, the hammer 47 rotated by the motor 6, the anvil 10 struck in the rotational direction by the hammer 47, the hammer case 4 accommodating the hammer 47, and the COB light 50 that illuminates the front end side of the anvil 10. A groove 4E is provided in the hammer case 4. The COB light 50 is disposed in the groove 4E.

[0136] In the above configuration, since the COB light 50 is disposed in the groove 4E, the light emitted from the COB light 50 to the front side is irradiated to the work object, and the light emitted from the COB light 50 to the outer periphery side is blocked by the hammer case 4. This prevents the light emitted from the COB light 50 from entering the eyes of the worker. Therefore, the worker is prevented from feeling dazzled. Therefore, the worker is prevented from having difficulty in viewing the work object.

[0137] In this embodiment, the groove 4E is provided so as to recess rearward from the front end portion of the hammer case 4.

[0138] In the above configuration, the light emitted forward from the COB light 50 is irradiated onto the work target in front of the hammer case 4.

[0139] In an embodiment, the groove 4E is provided around the anvil 10.

[0140] In the above configuration, the groove 4E is provided in an annular shape.

[0141] In the embodiment, the impact tool 1 includes an optical member 57 having a light transmitting portion 57C disposed forward of the COB light 50. At least a portion of the optical member 57 is disposed in the groove 4E.

[0142] In the above configuration, the light emitted forward from the COB light 50 is irradiated onto the work target in front of the hammer case 4 via the light transmitting portion 57C of the optical member 57. Since the optical member 57 is disposed in the groove 4E, the light emitted forward from the optical member 57 is irradiated onto the work target, and the light emitted toward the outer periphery from the optical member 57 is blocked by the hammer case 4.

[0143] In the embodiment, the light transmitting portion 57C is disposed in the groove 4E.

[0144] In the above configuration, since the light-transmitting portion 57C is positioned inside the groove 4E, the light emitted forward from the optical member 57 is irradiated onto the work object, and the light emitted toward the outer periphery from the optical member 57 is blocked by the hammer case 4.

[0145] In the embodiment, the optical member 57 has an outer cylinder portion 57A arranged on the outer periphery side of the COB light 50, and an inner cylinder portion 57B arranged on the inner periphery side of the COB light 50. Each of the outer cylinder portion 57A and the inner cylinder portion 57B is arranged in the groove 4E.

[0146] In the above configuration, the optical member 57 is disposed so as to surround the COB light 50.

[0147] In the embodiment, the impact tool 1 includes a motor 6, a hammer 47 rotated by the motor 6, an anvil 10 struck in the rotational direction by the hammer 47, a hammer case 4 accommodating the hammer 47, and a COB light 50 that illuminates the tip side of the anvil 10. The COB light 50 is held in the hammer case 4. The hammer case 4 has a protrusion 4D disposed on the outer circumferential side of the COB light 50.

[0148] In the above configuration, even if the impact tool 1 is dropped, the COB light 50 is protected by the protrusion 4D of the hammer case 4. This prevents the COB light 50 from being damaged and prevents the light emission performance of the COB light 50 from being deteriorated.

[0149] In the embodiment, the protrusion 4D protrudes forward beyond the COB light 50.

[0150] In the above configuration, the COB light 50 is sufficiently protected by the protrusion 4D.

[0151] In the embodiment, the protrusions 4D are provided to surround the anvil 10.

[0152] In the above configuration, the protrusion 4D is provided in an annular shape.

[0153] In the embodiment, the COB light 50 has a substrate 51 and an LED chip 52 mounted on the front surface of the substrate 51. The substrate 51 is provided so as to surround the anvil 10.

[0154] In the above configuration, the ring-shaped COB light 50 is provided on the impact tool 1 .

[0155] In the embodiment, the impact tool 1 includes an optical member 57 having a light transmitting portion 57C disposed forward of the COB light 50. The protrusion 4D is disposed on the outer circumferential side of the optical member 57.

[0156] In the above configuration, the COB light 50 and the optical member 57 are each protected by the protrusion 4D.

[0157] In the embodiment, an exit surface 57F of the light transmitting portion 57C is disposed at the same position as the front end surface of the protrusion 4D or rearward of the front end surface of the protrusion 4D.

[0158] In the above configuration, the optical member 57 is sufficiently protected by the protrusion 4D.

[0159] In the embodiment, the anvil 10 has an anvil shaft portion 10C arranged on the inner peripheral side of the optical member 57. The hammer case 4 has a front cylinder portion 4B arranged around the anvil shaft portion 10C. The impact tool 1 includes a snap ring 16 arranged in a snap ring groove 4F provided in the front cylinder portion 4B. The snap ring 16 supports the optical member 57 from the front side.

[0160] In the above configuration, the optical member 57 and the COB light 50 are prevented from slipping out forward from the hammer case 4. The snap ring 16 functions as a retaining member that prevents the optical member 57 and the COB light 50 from slipping out forward.

[0161] In the embodiment, the optical member 57 has an inner circumferential side protrusion 57G that is disposed on the inner circumferential side of the light transmitting portion 57C and disposed forward of an emission surface 57F of the light transmitting portion 57C. The snap ring 16 supports the inner circumferential side protrusion 57G.

[0162] In the above configuration, the optical member 57 is stably supported from the front side by the snap ring 16 placed in the snap ring groove 4F.

[0163] In the embodiment, the optical member 57 may have a stopper portion 57H that supports the end of the snap ring 16.

[0164] In the above-described configuration, the snap ring 16 is prevented from rotating relative to the hammer case 4 and the optical member 57. The stopper portion 57H functions as a rotation-preventing member that prevents the snap ring 16 from rotating.

[0165] In the embodiment, the impact tool 1 includes a buffer member 80 disposed between the rear surface of the COB light 50 and the hammer case 4 .

[0166] In the above-mentioned configuration, for example, when the impact tool 1 is dropped, the impact applied to the COB light 50 is mitigated. Since the COB light 50 is sandwiched between the buffer member 80 and the snap ring 16 from the front and rear directions, the relative position between the COB light 50 and the hammer case 4 is suppressed from changing.

[0167] In the embodiment, the optical member 57 has a convex portion 57D disposed below the light transmitting portion 57C. The impact tool 1 includes a housing 2 that is fixed to the rear of the hammer case 4 and accommodates the motor 6. The housing 2 has a cover portion 21C that covers the convex portion 57D from the front side.

[0168] In the above configuration, the lead wire connected to the COB light 50 is supported by the protrusion 57D. The protrusion 57D is protected by the cover 21C. Even if at least a part of the light emitted from the COB light 50 enters the protrusion 57D, the light emitted from the protrusion 57D is blocked by the cover 21C.

[0169] In the embodiment, the hammer case 4 has an opposing surface 4J that faces the upper surface 21D of the cover portion 21C. The opposing surface 4J is provided so as to extend in the left-right direction.

[0170] In the above configuration, when the housing 2 is a so-called half-split housing consisting of the left housing 2L and the right housing 2R, the left housing 2L and the right housing 2R can be smoothly fixed together using the opposing surface 4J.

[0171] In the embodiment, the impact tool 1 includes a housing 2 that is fixed to the rear of a hammer case 4 with a screw 5 and that houses a motor 6. The hammer case 4 has a screw boss portion 4H that is coupled to the screw 5. At least a portion of the housing 2 is disposed so as to cover the screw boss portion 4H.

[0172] In the above configuration, the screw boss portion 4H of the hammer case 4 is protected by the housing 2. In addition, the hand of an operator gripping the grip portion 22 of the housing 2 is prevented from directly touching the hammer case 4.

[0173] In the embodiment, the anvil 10 has an anvil shaft portion 10C arranged on the inner peripheral side of the optical member 57. The impact tool 1 includes an anvil bearing 46 that is held by the hammer case 4 and rotatably supports the anvil shaft portion 10C. The front end portion of the hammer 47 is arranged forward of the rear end portion of the anvil bearing 46.

[0174] In the above configuration, the hammer case 4 and the anvil bearing 46 overlap, which prevents the impact tool 1 from becoming large in size. The length of the upper part of the impact tool 1 in the front-rear direction (the so-called overall length) is shortened.

[0175] [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 are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0176] FIG. 12 is a front perspective view showing the upper part of the impact tool 1B according to the embodiment. FIG. 13 is a rear perspective view showing the upper part of the impact tool 1B according to the embodiment. FIG. 14 is a side view of the upper part of the impact tool 1B according to the embodiment. FIG. 15 is a vertical cross-sectional view showing a part of the impact tool 1B according to the embodiment. FIG. 16 is a vertical cross-sectional view showing an enlarged part of the impact tool 1B according to the embodiment. FIG. 17 is a cross-sectional view showing the upper part of the impact tool 1B according to the embodiment, which corresponds to the cross-sectional view taken along the line AA in FIG. 14. FIG. 18 is a cross-sectional view showing the upper part of the impact tool 1B according to the embodiment, which corresponds to the cross-sectional view taken along the line BB in FIG. 14. FIG. 19 is an exploded front perspective view showing the upper part of the impact tool 1B according to the embodiment. FIG. 20 is an exploded rear perspective view showing the bumper 90 and the light unit 18 according to the embodiment. FIG. 21 is an exploded front view of the upper part of the impact tool 1B according to the embodiment.

[0177] As in the above embodiment, the impact tool 1B is an impact wrench. The impact tool 1B includes a housing 2, a rear cover 3, a hammer case 104, a screw 5, a spindle 8, a striking mechanism 9, an anvil 10, a trigger lever 14, a forward / reverse switching lever 15, a circlip 116, a seal member 17, a light unit 18, and a bumper 90.

[0178] The hammer case 104 houses the spindle 8. The hammer case 104 houses the striking mechanism 9. As in the above-described embodiment, the striking mechanism 9 is disposed forward of the motor 6. The striking mechanism 9 is driven by the motor 6. The hammer case 104 houses a portion of the anvil 10. The hammer case 104 is made of metal. In the embodiment, the hammer case 104 is made of aluminum. The hammer case 104 is cylindrical.

[0179] The hammer case 104 includes a rear cylinder portion 4A, a front cylinder portion 4B, an annular portion 4C, a protrusion portion 4D, a groove 4E, a screw boss portion 4H, a bumper groove 4L, and a circlip groove 4M. The impact mechanism 9 is accommodated in the rear cylinder portion 4A. The front cylinder portion 4B is disposed forward of the rear cylinder portion 4A. The outer diameter of the rear cylinder portion 4A is larger than the outer diameter of the front cylinder portion 4B. The inner diameter of the rear cylinder portion 4A is larger than the inner diameter of the front cylinder portion 4B. The annular portion 4C is disposed so as to connect the front end portion of the rear cylinder portion 4A and the rear end portion of the front cylinder portion 4B. The protrusion portion 4D protrudes forward from the outer edge portion of the annular portion 4C. In a plane perpendicular to the rotation axis AX, the protrusion portion 4D is annular.

[0180] The hammer case 104 is connected to the front of the motor accommodating portion 21 of the housing 2. The motor accommodating portion 21 accommodates the rear of the hammer case 104. The motor accommodating portion 21 is fixed to the rear of the hammer case 104 with screws 5. The screws 5 are inserted from the rear of the screw boss portion 2H into openings provided in the screw boss portion 2H, and then inserted into screw holes provided in the screw boss portion 4H. Four screw boss portions 2H and four screw boss portions 4H are provided in the circumferential direction. Four screws 5 are provided in the circumferential direction.

[0181] The screws 3S that secure the rear cover 3 to the motor housing 21 are tightened from the rear of the rear cover 3. The screws 5 that secure the motor housing 21 to the hammer case 104 are tightened from the rear of the screw boss portion 2H. Since all six screws (two screws 3S and four screws 5) are tightened from the rear, the workability of assembling the impact tool 1B is improved. An assembler who assembles the impact tool 1B can tighten all six screws (two screws 3S and four screws 5) from the rear without changing the orientation of the impact tool 1B.

[0182] The screw boss portions 2H are provided at the upper left, lower left, upper right, and lower right of the rotation axis AX. The screw boss portions 4H are provided at the upper left, lower left, upper right, and lower right of the rotation axis AX. The screw boss portions 4H include upper left and upper right screw boss portions 4Ha and lower left and lower right screw boss portions 4Hb. The front portion of the motor accommodating portion 21 covers at least a part of the surface of the hammer case 104. The front portion of the motor accommodating portion 21 covers at least the surface of the lower left screw boss portion 4Hb and the surface of the lower right screw boss portion 4Hb. In the vertical direction, the upper end portion 2A of the motor accommodating portion 21 that covers the surface of the hammer case 104 is disposed above the center portion of the hammer case 104. In the front-rear direction, the front end portion 2B of the motor accommodating portion 21 that covers the surface of the hammer case 104 is disposed forward of the rear end portion of the bumper 90. That is, the motor accommodating portion 21 covers a part of the bumper 90. The forward / reverse switching lever 15 is disposed inside an opening 2C provided in the lower part of the motor housing portion 21.

[0183] 12, 13, 14, 17, and 18, the motor accommodating section 21 does not cover the surface of the upper left screw boss portion 4Ha and the surface of the upper right screw boss portion 4Ha. Note that the motor accommodating section 21 may cover the surface of the upper left screw boss portion 4Ha and the surface of the upper right screw boss portion 4Ha.

[0184] For example, the hammer case 104 may heat up due to the rotation of the spindle 8 and the operation of the impact mechanism 9. The surface of the lower part of the hammer case 104, including the surface of the lower left screw boss portion 4Hb and the surface of the lower right screw boss portion 4Hb, is covered with the motor housing portion 21, so that when the operator operates the forward / reverse switching lever 15 or the trigger lever 14, the operator is prevented from directly touching the hammer case 104 with his / her hands.

[0185] The spindle 8 is rotated by the torque of the motor 6. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the torque of the spindle 8. The anvil 10 is an output part of the impact tool 1B that is actuated by the torque of the motor 6.

[0186] The anvil shaft portion 10C of the anvil 10 is rotatably supported by an anvil bearing 146. The anvil bearing 146 is an oilless bearing, which is a type of sliding bearing. The anvil bearing 146 is made of iron. The anvil bearing 146 is cylindrical.

[0187] In this embodiment, the anvil bearing 146 is held in the front cylinder portion 4B of the hammer case 104 via a bush 81. The bush 81 is made of iron. The bush 81 is fixed to the hammer case 104 by insert molding.

[0188] The bushing 81 has a tubular portion 81A disposed inside the front tubular portion 4B, and a flange portion 81B extending radially outward from the rear end of the tubular portion 81A. The tubular portion 81A is fixed to the inner circumferential surface of the front tubular portion 4B. The flange portion 81B is fixed to the rear surface of the annular portion 4C. In the embodiment, the front tubular portion 4B has a protrusion 4N protruding radially inward from the inner circumferential surface of the front tubular portion 4B. The hook effect of the protrusion 4N firmly fixes the bushing 81 to the front tubular portion 4B.

[0189] After the bushing 81 is provided in the hammer case 104 by insert molding, the anvil bearing 146 is press-fitted into the inside of the tubular portion 81A of the bushing 81. As described above, the hammer case 104 is made of aluminum, and the bushing 81 is made of iron. The hardness of the bushing 81 is higher than the hardness of the front tubular portion 4B. Since the anvil bearing 146 is press-fitted into the bushing 81, which has a high hardness, the anvil bearing 146 is firmly fixed to the bushing 81. Even if the dimension of the anvil bearing 146 in the front-to-rear direction is short, the anvil bearing 146 is firmly fixed to the bushing 81.

[0190] The bushing 81 may be fixed to the hammer case 104 by a method other than the insert molding. The bushing 81 may be fixed to the front cylinder portion 4B after the surface of the bushing 81 is knurled or serrated.

[0191] The flange portion 81B protects the rear surface of the annular portion 4C. There is a possibility that the front surface of the anvil protrusion 10D may come into contact with the rear surface of the annular portion 4C. By providing the flange portion 81B on the rear surface of the annular portion 4C, the front surface of the anvil protrusion 10D comes into contact with the anvil protrusion 10D before coming into contact with the rear surface of the annular portion 4C. This suppresses wear on the rear surface of the annular portion 4C.

[0192] The light unit 18 is disposed in the front part of the hammer case 104. The light unit 18 is annular. The light unit 18 is disposed around the front cylinder portion 4B. The light unit 18 is disposed around the anvil shaft portion 10C via the front cylinder portion 4B.

[0193] As in the above-described embodiment, the light unit 18 has a COB light 50 and an optical member 57. At least a part of the optical member 57 is disposed forward of the COB light 50. The optical member 57 has an outer cylinder portion 57A, an inner cylinder portion 57B, and a light-transmitting portion 57C. The outer cylinder portion 57A is disposed on the outer periphery side of the COB light 50. The inner cylinder portion 57B is disposed on the inner periphery side of the COB light 50. The light-transmitting portion 57C is disposed forward of the COB light 50. The light emitted from the COB light 50 passes through the light-transmitting portion 57C and is irradiated forward of the light unit 18. A buffer member 80 is disposed behind the COB light 50.

[0194] The protrusion 4D of the hammer case 104 is disposed on the outer periphery of the COB light 50. The protrusion 4D protrudes forward from the COB light 50. The protrusion 4D is substantially annular. The protrusion 4D is disposed on the outer periphery of the optical member 57. The front surface of the light transmitting portion 57C is disposed rearward of the front end surface of the protrusion 4D.

[0195] A groove 4E is provided in the hammer case 104 on the inner periphery side of the protrusion 4D. The groove 4E is provided in the front part of the hammer case 104. In a plane perpendicular to the rotation axis AX, the groove 4E is annular. The groove 4E is provided so as to be recessed rearward from the front end part of the hammer case 104. In the radial direction, the groove 4E is provided between the front side cylinder part 4B and the protrusion 4D. The groove 4E is provided so as to surround the anvil shaft part 10C. The light unit 18 is disposed inside the groove 4E.

[0196] The circlip 116 is disposed in a circlip groove 4M provided in the front cylinder portion 4B. The circlip groove 4M is provided forward of the front surface of the light transmitting portion 57C. The circlip 116 supports the optical member 57 from the front side. The circlip 116 contacts the radial inner edge portion of the front surface of the light transmitting portion 57C.

[0197] The bumper 90 is disposed so as to cover the front end of the surface of the hammer case 104. The bumper 90 is annular. The bumper 90 is disposed radially outside the light unit 18. The bumper 90 protects the light unit 18. The bumper 90 protects at least a portion of the hammer case 104.

[0198] In the front-rear direction, the position of the light unit 18 and the position of at least a part of the bumper 90 are the same. That is, the bumper 90 overlaps the light unit 18 in the axial direction.

[0199] In addition, in the front-rear direction, the position of the light unit 18 and the position of at least a part of the anvil bearing 146 are the same. That is, the anvil bearing 146 overlaps with the light unit 18 in the axial direction.

[0200] The bumper 90 is made of an elastomer. The elastomer forming the bumper 90 may be a thermoplastic elastomer or a thermosetting elastomer. The rubber hardness of the bumper 90 is 100Hs JIS-A or less.

[0201] The bumper 90 is disposed so as to cover the outer peripheral surface and the front end face of the protrusion 4D. The bumper 90 has a cylindrical portion 91 that covers the outer peripheral surface of the protrusion 4D, an annular portion 92 that covers the front end face of the protrusion 4D, and a protruding portion 93 that protrudes radially inward from the inner peripheral surface of the cylindrical portion 91. In a plane perpendicular to the rotation axis AX, the protruding portion 93 is annular.

[0202] A bumper groove 4L is provided on the outer circumferential surface of the protrusion 4D. The bumper groove 4L is provided so as to surround the rotation axis AX. The protrusion 93 is inserted into the bumper groove 4L provided on the outer circumferential surface of the protrusion 4D.

[0203] In the front-rear direction, the rear end of the bumper 90 is disposed forward of the front end of the hammer 47 .

[0204] 19, a slit 105 is provided in the lower part of the front end portion of the hammer case 104. A convex portion 57D of the optical member 57 of the light unit 18 fits into the slit 105. By fitting the convex portion 57D into the slit 105, relative rotation of the light unit 18 with respect to the hammer case 104 is suppressed.

[0205] 19, 20, and 21, the bumper 90 has a protrusion 94 that protrudes downward from the lower part of the cylindrical part 91. As shown in FIG. 21, the protrusion 94 is sandwiched between the left housing 2L and the right housing 2R from the left and right directions. In addition, the cover part 21C of the motor accommodating part 21 covers the protrusion 94 from the front side. This prevents the bumper 90 from slipping out of the housing 2 forward or rotating relative to the housing 2.

[0206] As described above, according to the embodiment, the elastomer bumper 90 is fixed around the protrusion 4D. The bumper 90 protects the light unit 18. For example, when the impact tool 1B hits a surrounding object, the bumper 90 hits the object, and the elastic force of the bumper 90 reduces the impact transmitted from the object to the light unit 18. This suppresses the deterioration of the light emitting performance of the light unit 18.

[0207] <Modification> Below, modified examples of the impact tool 1B according to this embodiment will be described.

[0208] In the above-described embodiment, the bumper 90 is disposed radially outward of the optical member 97. The front end of the bumper 90 may face the outer edge of the front surface of the optical member 97. The bumper 90 may function as a retaining member that prevents the light unit 18 from moving forward from the inside of the groove 4E.

[0209] In the above embodiment, the bumper 90 is arranged around the protrusion 4D. The rear end of the bumper 90 is arranged forward of the front end of the hammer 47. The rear end of the bumper 90 may be arranged rearward of the front end of the hammer 47. The bumper 90 may cover the entire surface of the hammer case 104.

[0210] In the above-described embodiment, the bumper 90 is replaceable with respect to the hammer case 104. When multiple bumpers 90 having mutually different colors are present, a first impact tool may be equipped with a bumper 90 of a first color, and a second impact tool may be equipped with a bumper 90 of a second color. An operator can distinguish between multiple impact tools by the colors of the bumpers 90.

[0211] In the above-described embodiment, at least a part of the bumper 90 may be made of a phosphorescent material. By making at least a part of the bumper 90 of a phosphorescent material, the operator can identify the impact tool 1B, for example, even at night.

[0212] Fig. 22 is a vertical cross-sectional view of an impact tool 1B according to a modified example. As shown in Fig. 22, the protrusion 4D may be omitted from the hammer case 104. The bumper 90 may directly support the light unit 18 from the radial outside. The bumper 90 may contact the outer cylinder portion 57A of the optical member 57 of the light unit 18.

[0213] 22, a recess 81C may be provided on the rear surface of the flange portion 81B of the bush 81. A lubricant may be stored in the recess 81C. The lubricant reduces the sliding resistance when the front surface of the anvil protrusion 10D and the rear surface of the flange portion 81B come into contact with each other.

[0214] In the example shown in FIG. 22, the bumper 90 and the optical member 57 may be integrally molded.

[0215] In the above-described embodiment, the bumper 90 may be secured to the hammer case 104 by an adhesive. The bumper 90 may also be secured to the hammer case 104 by fasteners such as screws or rivets.

[0216] In the above-described embodiment, the hammer case 104 and the bumper 90 may be integrally molded. The bumper 90 may be fixed to the hammer case 104 by insert molding.

[0217] [Other embodiments] In the above-described embodiment, the groove 4E does not have to be annular, and a plurality of grooves may be provided at intervals around the periphery of the anvil shaft portion 10C. A chip-shaped COB light and an optical member may be disposed in each of the plurality of grooves 4E.

[0218] In the above embodiment, the light 50 is a COB light. The light 50 does not have to be a COB light. The light 50 only needs to have a substrate and a light emitting element mounted on the substrate.

[0219] In the above embodiment, the impact tool 1 is an impact wrench. The impact tool 1 may be an impact driver.

[0220] In the above-described embodiment, the power source of the impact tool 1 does not have to be the battery pack 25, and may be a commercial power source (AC power source). [Explanation of symbols]

[0221] 1...impact tool, 1B...impact tool, 2...housing, 2A...upper end, 2B...front end, 2C...opening, 2H...screw boss, 2L...left housing, 2R...right housing, 2S...screw, 3...rear cover, 3S...screw, 4...hammer case, 4A...rear cylinder, 4B...front cylinder, 4C...annular portion, 4D...projection, 4E...groove, 4F...snap ring groove, 4H...screw boss, 4Ha...screw boss, 4Hb...screw boss, 4J...opposing surface, 4K...projection, 4L...bumper groove, 4M...circlip groove, 4N...projection, 5...screw, 6...motor, 7...reduction mechanism, 8...spindle, 8A... Flange portion, 8B... spindle shaft portion, 8C... annular portion, 8D... spindle groove, 8E... convex portion, 8F... grease groove, 9... striking mechanism, 10... anvil (output portion), 10B... concave portion, 10C... anvil shaft portion, 10D... anvil protrusion portion, 11... ball, 12... fan, 12A... bush, 13... battery mounting portion, 14... trigger lever, 15... forward / reverse switching lever, 16... snap ring, 17... sealing member, 18... light unit, 19... intake port, 20... exhaust port, 21... motor housing portion, 21C... cover portion, 21D... upper surface, 22... grip portion, 23... battery holding portion , 24...bearing box, 25...battery pack, 26...stator, 27...rotor, 28...stator core, 29...front insulator, 29S...screw, 30...rear insulator, 31...coil, 32...rotor core portion, 33...rotor shaft portion, 34...rotor magnet, 35...sensor magnet, 37...sensor board, 38...fusing terminal, 39...rotor bearing, 40...rotor bearing, 41...pinion gear, 42...planetary gear, 42P...pin, 43...internal gear, 44...spindle bearing, 45...washer, 46...anvil bearing, 46 A...outer sleeve, 46B...inner sleeve, 46C...flange portion, 47...hammer, 47A...hammer groove, 47B...hammer protrusion portion, 47C...recess, 47D...body portion, 47E...rear outer cylinder portion, 47F...front outer cylinder portion, 47G...inner cylinder portion, 47H...ball groove, 48...ball, 49...coil spring, 49A...first coil spring, 49B...second coil spring, 50...chip-on-board light-emitting diode (COB), 51...substrate, 51A...annular portion, 51B...support portion, 52...LED chip (light-emitting element), 54...bank, 55...phosphor, 57...optical member, 57A...outer cylinder portion,57B: inner cylindrical portion, 57C: light transmitting portion, 57D: convex portion, 57E: incident surface, 57F: exit surface, 57G: inner peripheral convex portion, 57H: stopper portion, 57J: concave portion, 80: buffer member, 81: bush, 81A: cylindrical portion, 81B: flange portion, 81C: concave portion, 90: bumper, 91: cylindrical portion, 92: annular portion, 93: convex portion, 94: protrusion portion, 104: hammer case, 105: slit, 116: circlip, 146: anvil bearing, 180: lead wire, AX: rotating shaft.

Claims

1. Motor and, A hammer rotated by the aforementioned motor, An anvil that is struck in the rotational direction by the aforementioned hammer, A hammer case for housing the aforementioned hammer, The anvil is equipped with a light that illuminates the front end side, A groove is provided in the aforementioned hammer case. The light is positioned in the groove, Impact tools.

2. The groove is provided so as to be recessed from the front end of the hammer case to the rear. The impact tool according to claim 1.

3. The groove is provided so as to surround the anvil. The impact tool according to claim 1.

4. The optical member comprises a light-transmitting portion positioned in front of the aforementioned light, At least a portion of the optical member is arranged in the groove, The impact tool according to claim 1.

5. The light-transmitting portion is arranged in the groove, The impact tool according to claim 4.

6. The optical member comprises an outer cylinder portion disposed on the outer circumference side of the light and an inner cylinder portion disposed on the inner circumference side of the light. The outer cylinder portion and the inner cylinder portion are each positioned in the groove, The impact tool according to claim 5.

7. Motor and, A hammer rotated by the aforementioned motor, An anvil that is struck in the rotational direction by the aforementioned hammer, A hammer case for housing the aforementioned hammer, The anvil is equipped with a light that illuminates the front end side, The light is held in the hammer case, The hammer case has a projection positioned on the outer circumference of the light, Impact tools.

8. The aforementioned projection protrudes forward from the light, The impact tool according to claim 7.

9. The aforementioned projection is provided so as to surround the anvil. The impact tool according to claim 7.

10. The light comprises a substrate and an LED chip mounted on the front surface of the substrate. The substrate is provided so as to surround the anvil. The impact tool according to claim 3 or claim 9.

11. The optical member comprises a light-transmitting portion positioned in front of the aforementioned light, The aforementioned projection is positioned on the outer periphery side of the optical member. The impact tool according to claim 9.

12. The light-transmitting surface is positioned at the same location as the front end surface of the projection or behind the front end surface of the projection. The impact tool according to claim 11.

13. The anvil has an anvil shaft portion that is positioned on the inner circumference side of the optical member, The hammer case has a front cylindrical portion arranged around the anvil shaft portion, The front cylindrical portion is equipped with a snap ring positioned in a snap ring groove, The snap ring supports the optical member from the front. The impact tool according to claim 4 or claim 11.

14. The optical member has an inner circumference protrusion that is positioned on the inner circumference side of the light-transmitting portion and in front of the exit surface of the light-transmitting portion, The snap ring supports the inner circumferential protrusion, The impact tool according to claim 13.

15. The optical member has a stopper portion that supports the end of the snap ring. The impact tool according to claim 14.

16. The light is provided with a cushioning member positioned between the rear surface of the light and the hammer case. The impact tool according to claim 14.

17. The optical member has a protrusion positioned below the light-transmitting portion, It is fixed to the rear of the hammer case and comprises a housing that accommodates the motor, The housing has a cover portion that covers the protrusion from the front. The impact tool according to claim 4 or claim 11.

18. The hammer case has a surface facing the upper surface of the cover portion, The opposing surfaces are provided so as to extend in the left-right direction. The impact tool according to claim 17.

19. The rear of the hammer case is fixed with screws and includes a housing that accommodates the motor, The hammer case has a threaded boss portion that is coupled to the screw, At least a portion of the housing is arranged to cover the screw boss portion, The impact tool according to claim 1 or claim 7.

20. The anvil has an anvil shaft portion that is positioned on the inner circumference side of the optical member, The hammer case is held in place and includes an anvil bearing that rotatably supports the anvil shaft portion, The front end of the hammer is positioned in front of the rear end of the anvil bearing. The impact tool according to claim 4 or claim 11.

21. The aforementioned light is a COB light. The impact tool according to claim 1 or claim 7.

22. Motor and, A striking mechanism positioned in front of the aforementioned motor and driven by the aforementioned motor, An anvil that is struck in the rotational direction by the aforementioned striking mechanism, A hammer case housing the aforementioned striking mechanism, An annular light unit positioned at the front of the hammer case, The light unit comprises an annular bumper made of elastomer, positioned radially outward. Impact tools.

23. In the front-rear direction, the position of the light unit and the position of at least a part of the bumper are the same. The impact tool according to claim 22.

24. An annular groove is provided at the front of the aforementioned hammer case. The light unit is positioned in the groove, The impact tool according to claim 22.

25. The anvil bearing provides rotatable support for the anvil, The aforementioned hammer case is The rear cylindrical portion that houses the striking mechanism, A front cylindrical portion is positioned in front of the aforementioned rear cylindrical portion and holds the anvil bearing, An annular portion connecting the front end of the rear cylindrical portion and the rear end of the front cylindrical portion, The annular portion has a projection that protrudes forward from the outer edge of the annular portion, The groove is provided between the front cylindrical portion and the projection portion. The bumper is positioned to cover the outer circumferential surface of the projection. The impact tool according to claim 24.

26. The bumper is positioned to cover the front end surface of the projection. The impact tool according to claim 25.

27. The aforementioned bumper is, A cylindrical portion covering the outer surface of the aforementioned projection, The cylindrical portion has a protrusion that extends radially inward from the inner circumferential surface, A bumper groove is provided on the outer circumferential surface of the aforementioned projection. The aforementioned protrusion is inserted into the bumper groove, The impact tool according to claim 25.

28. In the front-rear direction, the position of the light unit and the position of at least a portion of the anvil bearing are the same. The impact tool according to claim 25.

29. The rubber hardness of the bumper is 100 Hs JIS-A or less. The impact tool according to claim 22.

30. The striking mechanism has a hammer that is rotated by the motor, In the front-rear direction, the bumper is positioned in front of the hammer. The impact tool according to claim 22.

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