Impact tool and impact wrench

Abstract

To light a work position with a lighting device properly in an angle impact tool.SOLUTION: An impact tool includes: a grip part extending in a front-rear direction; a motor housing part located forward of the grip part; a motor located inside the motor housing part; a spindle which is located forward of the motor, extends in a direction intersecting the front-rear direction, and is rotated by the motor; a hammer which is rotated by the spindle; an anvil which is struck in a rotation direction by the hammer; a tip tool holding part disposed at a lower end of the anvil; a hammer case which houses the spindle and the hammer; and a light emitting body held by the hammer case.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] A pistol-type impact tool is known that has a light located at its tip. There is also an angle impact tool that allows work in narrow spaces where the tip of a pistol-type impact tool cannot fit. An angle impact tool has a motor whose rotation shaft and output shaft intersect and are not parallel. An angle impact tool has a rod-like shape with a bent tip, allowing the tip to be inserted into a narrow work area to perform tightening work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5844970 Summary of the Invention [Problem to be solved by the invention]

[0004] When the tip of an angle impact tool is inserted into a narrow space, it becomes difficult to illuminate the work area with a light. It is desirable to be able to properly illuminate the work area with a light even when using an angle impact tool.

[0005] The technology disclosed in this specification aims to provide a light that properly illuminates the work area in an angle impact tool. [Means for solving the problem]

[0006] This specification discloses an impact tool that may include a grip portion extending in a front-to-rear direction, a motor housing portion disposed in front of the grip portion, a motor disposed inside the motor housing portion, a spindle disposed in front of the motor, extending in a direction intersecting the front-to-rear direction, and rotated by the motor, a hammer rotated by the spindle, an anvil struck in the rotational direction by the hammer, an end tool holder disposed at a lower end of the anvil, a hammer case that houses the spindle and the hammer, and a light emitter held by the hammer case. [Effects of the Invention]

[0007] According to the above configuration, the light can properly illuminate the work area in the angle impact tool. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an impact tool according to an embodiment. [Figure 2] FIG. 2 is a side view showing the impact tool according to the embodiment. [Figure 3] FIG. 3 is a bottom view showing the impact tool according to the embodiment. [Figure 4] FIG. 4 is a vertical cross-sectional view showing the impact tool according to the embodiment. [Figure 5] FIG. 5 is a vertical cross-sectional view showing a motor housing of the impact tool according to the embodiment. [Figure 6] FIG. 6 is a vertical cross-sectional view showing a hammer case of the impact tool according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view of the impact tool according to the embodiment taken along the anvil in the left-right direction. [Figure 8] FIG. 8 is a perspective view showing an operation panel according to the embodiment. [Figure 9] FIG. 9 is a schematic diagram showing the attachment of the battery pack to the battery holding portion according to the embodiment. [Figure 10]FIG. 10 is a longitudinal cross-sectional view taken along the front-rear direction showing the light unit according to the embodiment. [Figure 11] FIG. 11 is an exploded perspective view showing the structure of the light unit according to the embodiment. [Figure 12] FIG. 12 is a perspective view from below showing the front part of the impact tool according to the embodiment. [Figure 13] FIG. 13 is an exploded perspective view from below showing the attachment of the light cover to the hammer case according to the embodiment. [Figure 14] FIG. 14 is a perspective view showing the hammer case according to the embodiment, seen from below. [Figure 15] FIG. 15 is a bottom view of the hammer case with the light cover removed. [Figure 16] FIG. 16 is a perspective view showing the light cover. [Figure 17] FIG. 17 is a vertical cross-sectional view showing the periphery of a bevel gear of an impact tool according to an embodiment. [Figure 18] FIG. 18 is an exploded perspective view showing the rear surface of the hammer case according to the embodiment. [Figure 19] FIG. 19 is an exploded perspective view showing the front surface of the motor housing part according to the embodiment. [Figure 20] FIG. 20 is an exploded perspective view showing a bevel gear, a bearing, and an intermediate support member according to the embodiment. [Figure 21] FIG. 21 is a vertical cross-sectional view showing an intermediate support member according to the embodiment. [Figure 22] FIG. 22 is an exploded perspective view showing a subassembly of the rotor according to the embodiment. [Figure 23] FIG. 23 is a perspective view showing an intermediate support member according to the second embodiment. [Figure 24] FIG. 24 is an exploded perspective view showing a subassembly of a motor according to the second embodiment. [Figure 25] FIG. 25 is a cross-sectional view showing an intermediate support member according to the third embodiment. [Figure 26]FIG. 26 is a cross-sectional view showing an intermediate support member according to the fourth embodiment. [Figure 27] FIG. 27 is a vertical cross-sectional view showing the periphery of an intermediate support member according to the fourth embodiment. [Figure 28] FIG. 28 is a vertical cross-sectional view showing an intermediate support member and a fixing member according to the fifth embodiment. [Figure 29] FIG. 29 is a vertical cross-sectional view showing a front part of an impact tool according to a sixth embodiment. [Figure 30] FIG. 30 is a perspective view showing the front part of the impact tool according to the seventh embodiment, viewed from below. [Figure 31] FIG. 31 is a bottom view showing the front part of the impact tool according to the seventh embodiment. [Figure 32] FIG. 32 is an exploded perspective view from below showing the attachment of the light cover to the hammer case according to the seventh embodiment. [Figure 33] FIG. 33 is a longitudinal cross-sectional view taken along the front-rear direction showing the light unit according to the seventh embodiment. [Figure 34] FIG. 34 is a bottom view showing the front part of the impact tool with the light cover removed according to the seventh embodiment. [Figure 35] FIG. 35 is a vertical cross-sectional view showing a front part of an impact tool according to a seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, the impact tool may include a grip portion extending in the fore-and-aft direction, a motor housing portion located in front of the grip portion, a motor located inside the motor housing portion, a spindle located in front of the motor, extending in a direction intersecting the fore-and-aft direction, and rotated by the motor, a hammer rotated by the spindle, an anvil struck in the rotational direction by the hammer, a tool holder located at the lower end of the anvil, a hammer case that houses the spindle and the hammer, and an illuminant held in the hammer case.

[0010] In the above-described configuration, in an angle impact tool including a spindle extending in a direction intersecting the front-to-rear direction, a hammer rotated by the spindle, and an anvil struck in the rotational direction by the hammer, the light emitter is held in the hammer case that houses the spindle and the hammer. This allows the light emitter to be positioned near the anvil, so that light from the light emitter can reach the work area near the anvil even when the tip (anvil) of the impact tool is inserted into a narrow space. As a result, the light (light emitter) can properly illuminate the work area in the angle impact tool.

[0011] In one or more embodiments, the spindle may extend downwardly along an axis of rotation that is perpendicular to the front-to-rear direction.

[0012] With the above configuration, the tip of the impact tool on which the spindle is mounted can be positioned in front of the work area for tightening. Because the hammer case housing the spindle faces the work area, the light-emitting element held in the hammer case can effectively illuminate the work area.

[0013] In one or more embodiments, the light emitter may be carried on the underside of the hammer case.

[0014] In the above configuration, when the tip (anvil) of the impact tool is inserted into a narrow space, light can be irradiated from the underside of the hammer case toward the work location.

[0015] In one or more embodiments, the impact tool may further include a buffer member disposed between the light emitter and the lower surface of the hammer case.

[0016] In the above configuration, when the light emitter is held in the hammer case that houses the spindle and the hammer, the buffer member can reduce the transmission of vibrations caused by the impact of the hammer to the light emitter.

[0017] In one or more embodiments, a plurality of light emitters may be provided around the anvil and may be arranged along the circumferential direction of the anvil.

[0018] In this configuration, light can be emitted from multiple points around the anvil toward the work area, further improving the visibility of the work area. In addition, the circular row of light emitters can illuminate a wide area around the work area, preventing shadow areas from being formed.

[0019] In one or more embodiments, the impact tool may further include a speed reduction mechanism housed in the hammer case and configured to transmit rotational force of the motor to the spindle. The light emitter may be held on a lower surface of a portion of the hammer case that houses the speed reduction mechanism.

[0020] With the above configuration, the light emitter can be held in a position near but not directly below the rotation mechanism including the spindle, hammer, and anvil. Therefore, even if a large tool bit is attached to the tool holder at the bottom of the anvil, the light is unlikely to be blocked by the tool bit, and the light emitter can be placed in a position where it can properly illuminate the area where the tool bit is being used.

[0021] In one or more embodiments, the hammer case may include a first portion that houses the spindle and the hammer, and a second portion that is continuous with the rear of the first portion. The light emitter may be held on a lower surface of the second portion of the hammer case.

[0022] In the above configuration, the light emitter can be held in the vicinity of the anvil in the second section following the first section that houses the spindle and hammer. Therefore, even if a large tool bit is attached to the tool holder at the bottom of the anvil, the light emitter is unlikely to be blocked by the tool bit, and can be positioned so that it can properly illuminate the area where the tool bit is being used.

[0023] In one or more embodiments, the impact tool may further include a lead wire connected to the light emitter and extending along the underside of the hammer case to the motor housing portion, and a light cover positioned on the underside of the hammer case to hold the light emitter and cover the lead wire.

[0024] In the above configuration, not only the light emitter but also the lead wires can be arranged on the underside of the hammer case, which makes it easier to assemble the impact tool.

[0025] In one or more embodiments, the impact tool may include a grip portion extending in the fore-and-aft direction, a motor housing portion located in front of the grip portion, a motor located inside the motor housing portion, a spindle rotated by the motor, a hammer that moves relative to the spindle, an anvil that is struck directly or indirectly in the rotational direction by the hammer, a tool holder located at the lower end of the anvil, a plurality of light emitters located around the anvil, a hammer case that houses the spindle and the hammer, and a light emitter holder that is separate from the motor housing portion, is located on the underside of the hammer case, and holds the plurality of light emitters.

[0026] In the above configuration, a light-emitting element holder that holds multiple light-emitting elements is disposed on the underside of the hammer case that houses the spindle and hammer. This positions the light-emitting elements near the anvil, allowing light from the light-emitting elements to reach the work area near the anvil even when the tip (anvil) of the impact tool is inserted into a narrow space. As a result, the light (light-emitting element) can properly illuminate the work area in the angle impact tool.

[0027] In one or more embodiments, the lower surface of the hammer case may have a flat mounting surface and a cylindrical portion that protrudes downward from the mounting surface and through which the anvil passes. The light emitter and the light emitter holder may be disposed on the mounting surface.

[0028] With the above configuration, the light emitter and light emitter holder can be placed on the mounting surface near the anvil. Because the light emitter can be positioned closer to the anvil, it is possible to more appropriately illuminate the work area even in a narrow space. The flat mounting surface allows the light emitter and light emitter holder to be easily and stably placed.

[0029] In one or more embodiments, the impact tool may include an optical member that is disposed to cover the plurality of light emitters and that diffuses light from the plurality of light emitters. The light emitter holder may hold the plurality of light emitters by pressing a lower surface of the optical member toward the hammer case.

[0030] In the above configuration, the optical member can illuminate a wide area around the work location, thereby preventing the formation of shadowed areas. The light-emitting element holder can collectively hold a plurality of light-emitting elements via the optical member.

[0031] In one or more embodiments, the light holder may be secured to the underside of the hammer case by a screw.

[0032] With the above configuration, the light emitter holder can be firmly fixed to the hammer case, and even if the hammer case vibrates due to the impact of the hammer, rattle and chatter of the light emitter holder can be suppressed. In addition, since the light emitter holder can be attached and detached with a screw, the assembly workability and maintenance of the light emitter are improved.

[0033] In one or more embodiments, the plurality of light emitters may be arranged along the circumferential direction of the anvil. The optical member may be formed in a ring shape surrounding the anvil so as to cover the plurality of light emitters. The light emitter holder may have a peripheral wall portion surrounding the periphery of the optical member. The peripheral wall portion may have boss portions to which screws are attached. The light emitter holder may be fixed to the underside of the hammer case by screws at a plurality of locations around the periphery of the optical member.

[0034] In the above configuration, the multiple light emitters arranged in the circumferential direction and the annular optical member allow light to be emitted from the entire circumference of the anvil, thereby illuminating a wide area around the work area and preventing shadow areas from being formed. Even in this case, the multiple light emitters and the optical member can be securely held by the light emitter holder. Furthermore, the peripheral wall of the light emitter holder can prevent light from leaking in unnecessary directions around the optical member. By providing a boss on the peripheral wall, the light emitter holder can be easily fixed to the hammer case without excessively pressing on the light emitters or the optical member.

[0035] In one or more embodiments, the impact tool may include a grip portion extending in the fore-and-aft direction, a motor housing portion located in front of the grip portion, a motor located inside the motor housing portion, a spindle rotated by the motor, a hammer that moves relative to the spindle, an anvil that is struck directly or indirectly in the rotational direction by the hammer, a tool holder located at the lower end of the anvil, a plurality of light emitters located around the anvil, a hammer case that houses the spindle and the hammer, lead wires extending from the motor housing portion and connected to the plurality of light emitters, and a cover portion that is separate from the motor housing portion, is located on the underside of the hammer case, and covers the lead wires.

[0036] In the above configuration, since the multiple light emitters are arranged around the anvil, light from the light emitters can reach the work area near the anvil even when the tip (anvil) of the impact tool is inserted into a narrow space. As a result, the light (light emitter) can properly illuminate the work area in the angle impact tool. Furthermore, since the lead wires connected to the multiple light emitters are routed from the outside (bottom surface) of the hammer case and covered by the cover, the assembly workability of the multiple light emitters and ease of wiring are improved.

[0037] In one or more embodiments, the lead wires may include a first lead wire extending from the motor housing portion and a second lead wire connected to the first lead wire via a connector and connected to the plurality of light emitters. The cover portion may cover the connector, the first lead wire, and the second lead wire.

[0038] In the above configuration, the first lead wire and the second lead wire are connected via a connector on the underside of the hammer case, and the connector, the first lead wire, and the second lead wire are covered by the cover, so that the wiring of the multiple light emitters can be connected and disconnected without disassembling the inside of the hammer case, thereby improving the ease of assembly and maintenance of the light emitters.

[0039] In one or more embodiments, the impact tool may further include a ground wire extending from the motor housing portion and connecting to the underside of the hammer case. The cover portion may cover the lead wire and the ground wire.

[0040] In the above configuration, not only the lead wires connected to the light emitter but also the ground wire can be arranged on the underside of the hammer case, and the lead wires and the ground wire can be covered together with the cover part. As a result, the assembly workability of the light emitter can be further improved. In addition, the device configuration can be simplified compared to when the lead wires and the ground wire are covered with separate members.

[0041] In one or more embodiments, the hammer case may have a groove on the underside of the hammer case for placing the lead wires, and the cover may cover the groove in which the lead wires are placed.

[0042] In the above configuration, the lead wires are arranged in the grooves, so that the lead wires can be easily arranged in the appropriate positions during assembly, and the lead wires can be prevented from being pinched between the hammer case and the cover portion.

[0043] In one or more embodiments, the cover portion may extend from the position where the plurality of light emitters are disposed on the underside of the hammer case to the motor housing portion.

[0044] In the above configuration, the area from the position where the light emitter is disposed to the motor housing is covered by the cover, so that the lead wires can be prevented from being exposed to the outside from the cover or the motor housing.

[0045] In one or more embodiments, the cover portion may have a claw portion that engages with the motor housing portion, and may be fixed to the hammer case with the claw portion engaged with the motor housing portion.

[0046] In the above configuration, the cover engages with the motor housing, so the area from the position of the light emitter to the motor housing can be reliably covered. Furthermore, by engaging the claws with the motor housing, the cover can be effectively prevented from separating from or shifting out of position with the motor housing.

[0047] In one or more embodiments, the impact wrench may include a grip portion extending in the front-to-rear direction, a motor housing portion located in front of the grip portion, a motor located inside the motor housing portion, a spindle rotated by the motor and located in front of the motor, a hammer rotated by the spindle, an anvil struck in the rotational direction by the hammer, a square pillar-shaped tool holder located at the lower end of the anvil, a hammer case that houses the spindle and hammer, and one or more light-emitting elements held in the hammer case.

[0048] In the above configuration, the light emitter is held in the hammer case that houses the spindle and hammer. This allows the light emitter to be positioned near the anvil, so that light from the light emitter can reach the work area near the anvil even when the tip (anvil) of the impact wrench is inserted into a narrow space. As a result, the light (light emitter) can properly illuminate the work area in the angle impact tool.

[0049] Hereinafter, embodiments will be described with reference to the drawings. In the embodiments, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the center of the impact tool.

[0050] [First embodiment] FIG. 1 is a perspective view showing an impact tool 1 according to an embodiment. FIG. 2 is a side view showing the impact tool 1 according to an embodiment. FIG. 3 is a bottom view showing the impact tool 1 according to an embodiment. FIG. 4 is a vertical cross-sectional view showing the impact tool 1 according to an embodiment. FIG. 5 is a vertical cross-sectional view showing a motor housing portion 21 of the impact tool 1 according to an embodiment. FIG. 6 is a vertical cross-sectional view showing a hammer case 4 of the impact tool 1 according to an embodiment. FIG. 7 is a cross-sectional view in the left-right direction along the anvil 10 of the impact tool 1 according to an embodiment.

[0051] In the embodiment, the impact tool 1 is a power tool having an electric motor 6 as a power source. A direction parallel to the rotation axis AX of the motor 6 is referred to as the axial direction, a direction circumferentially around the rotation axis AX is referred to as the circumferential direction or rotation direction, and a radial direction of the rotation axis AX is referred to as the radial direction. In the radial direction, a position close to or approaching the rotation axis AX is referred to as the radially inner side or inner circumferential side, and a position farther from or away from the rotation axis AX is referred to as the radially outer side or outer circumferential side. In the embodiment, the rotation axis AX extends in the front-to-rear direction. One axial side is the front side (forward), and the other axial side is the rear side (rear).

[0052] In this embodiment, the impact tool 1 is an angle impact wrench and includes a housing 2, a hammer case 4, a motor 6, a speed reducer 7, a spindle 8, a striking mechanism 9, an anvil 10, a fan 12, a battery mounting section 13, a trigger lever 14, a forward / reverse rotation switch lever 15, an operation panel 16, a light unit 17, and a controller 18.

[0053] The housing 2 is made of synthetic resin and is composed of a pair of left and right half housings which are fixed together by a plurality of screws 2S.

[0054] The housing 2 has a motor housing portion 21, a grip portion 22, and a battery holding portion 23.

[0055] The motor housing portion 21 forms the front portion of the housing 2. The motor housing portion 21 is disposed in front of the grip portion 22. The motor housing portion 21 is cylindrical. The motor housing portion 21 houses the motor 6. The motor housing portion 21 houses the motor 6, the fan 12, and the bearing 38R. The operation panel 16 is provided on the upper portion of the motor housing portion 21.

[0056] The grip portion 22 extends in the front-rear direction. The grip portion 22 extends rearward from the motor housing portion 21. The trigger lever 14 is provided at a lower portion of the grip portion 22. The grip portion 22 is held by an operator.

[0057] The battery holding portion 23 is connected to the rear end of the grip portion 22. The battery holding portion 23 houses the controller 18. The battery holding portion 23 holds the battery pack 25. The battery pack 25 is attached to the battery attachment portion 13 provided on the underside of the battery holding portion 23.

[0058] The motor housing portion 21 has an intake port 19 and an exhaust port 20. The intake port 19 and the exhaust port 20 are provided on the left and right side surfaces of the motor housing portion 21. Air from the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. Air from the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 20.

[0059] The housing 2 and the hammer case 4 are aligned in the front-to-rear direction. The motor housing portion 21 and the hammer case 4 are connected in the front-to-rear direction. The front of the housing 2 and the rear of the hammer case 4 are connected. The housing 2 and the hammer case 4 are fixed together with screws 70.

[0060] The hammer case 4 is connected to the front of the motor housing portion 21. The motor housing portion 21 is fixed to the rear of the hammer case 4. A housing flange portion 21F is provided at the front end of the motor housing portion 21. A case flange portion 4F on which a plurality of boss portions 4H are formed is provided at the rear end of the hammer case 4. The hammer case 4 and the motor housing portion 21 are fixed together by passing screws 70 through the screw insertion holes of the housing flange portion 21F and engaging with the boss portions 4H.

[0061] The hammer case 4 houses a bevel gear 35, which is a pinion gear. The hammer case 4 houses a reduction mechanism 7. The hammer case 4 houses a spindle 8. The hammer case 4 houses a striking mechanism 9 including a hammer 47. The hammer case 4 houses a portion of an anvil 10. The hammer case 4 is made of metal. In this embodiment, the hammer case 4 is made of aluminum. The hammer case 4 is hollow and box-shaped.

[0062] The hammer case 4 includes a case body 4A and a lid portion 4B. The case body 4A is hollow and box-shaped, with openings at the rear and top. The rear surface of the case body 4A is connected to and covered by the motor housing portion 21 of the housing 2. The top surface of the case body 4A is covered by the lid portion 4B. The lid portion 4B is provided on the top surface of the case body 4A, extending from the front end to just before the rear end, and is fixed to the case body 4A with screws 4S. The hammer case 4 houses the reduction mechanism 7, spindle 8, striking mechanism 9, and anvil 10, which are assembled through the top opening of the case body 4A, by attaching the lid portion 4B to the case body 4A.

[0063] The hammer case 4 has a front surface, left and right side surfaces, and a bottom surface that are formed by the case main body 4A. As shown in FIG. 7 , the bottom surface of the hammer case 4 has a flat mounting surface 81 and a cylindrical portion 82 that protrudes downward from the mounting surface 81. The mounting surface 81 is a surface that extends in the front-rear and left-right directions. The mounting surface 81 connects the front surface and left and right side surfaces of the case main body 4A to the cylindrical portion 82. A light unit 17 and a light cover 60 are arranged on the mounting surface 81. The mounting surface 81 is covered by the light cover 60. The cylindrical portion 82 is located near the front surface of the bottom surface of the hammer case 4. The cylindrical portion 82 has a cylindrical shape. An internal opening of the cylindrical portion 82 communicates with the interior of the hammer case 4. The anvil 10 passes through the cylindrical portion 82. The anvil 10 protrudes downward from the interior of the hammer case 4 through the cylindrical portion 82.

[0064] The hammer case 4 holds a bearing 38F that rotatably supports the rotor 27 of the motor 6. A speed reduction mechanism 7 is disposed in front of the bearing 38F. A spindle 8 and an impact mechanism 9 are disposed in front of the speed reduction mechanism 7. An anvil 10 is disposed below the impact mechanism 9.

[0065] The motor 6 is a power source of the impact tool 1. The motor 6 generates rotational force. The motor 6 is an electric motor. The motor 6 is an inner rotor type brushless motor. The motor 6 is accommodated in the motor housing portion 21 of the housing 2. The motor 6 is disposed inside the motor housing portion 21.

[0066] As shown in Figure 5, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The stator 26 is supported by the motor housing portion 21. At least a portion of the rotor 27 is disposed inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates about a rotation axis AX that extends in the front-rear direction.

[0067] The stator 26 includes a stator core 28 , a front insulator 29 , a rear insulator 30 , and a coil 31 .

[0068] 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.

[0069] The front insulator 29 is provided in the front portion of the stator core 28. The rear insulator 30 is provided in the rear portion of the stator core 28. The front insulator 29 and the rear insulator 30 are each an electrical insulating member made of synthetic resin. The front insulator 29 is arranged so as to cover part of the surface of the teeth. The rear insulator 30 is arranged so as to cover part of the surface of the teeth.

[0070] The coils 31 are attached to the stator core 28 via the front insulators 29 and the rear insulators 30. Multiple coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulators 29 and the rear insulators 30. The coils 31 and the stator core 28 are electrically insulated by the front insulators 29 and the rear insulators 30.

[0071] The rotor 27 rotates about a rotation axis AX and includes a rotor core portion 32, a rotor shaft portion 33, and a rotor magnet .

[0072] The rotor core portion 32 and the rotor shaft portion 33 are each made of steel. In the embodiment, the rotor core portion 32 and the rotor shaft portion 33 are separate bodies. The rotor core portion 32 and the rotor shaft portion 33 may be integrally formed. A front portion of the rotor shaft portion 33 protrudes forward from the front end surface of the rotor core portion 32. A rear portion of the rotor shaft portion 33 protrudes rearward from the rear end surface of the rotor core portion 32.

[0073] The rotor magnet 34 is fixed to the rotor core portion 32. The rotor magnet 34 extends in the front-rear direction so as to penetrate the rotor core portion 32.

[0074] A sensor board 37 is attached to the rear insulator 30. 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 rotor magnet 34. The magnetic sensor detects the magnetic force of the rotor magnet 34 to detect the position of the rotor 27 in the rotational direction.

[0075] The rear portion of the rotor shaft portion 33 is rotatably supported by a bearing 38R. The front portion of the bearing 38R is rotatably supported by a bearing 38F. The bearing 38R is held in the housing 2. The bearing 38R is housed in a concave rear holding portion 21A provided in the motor housing portion 21. The bearing 38F is housed in a housing recess 85 provided in the rear portion of the hammer case 4. The front end portion of the rotor shaft portion 33 is disposed in the internal space of the hammer case 4 via an opening in the front surface of the motor housing portion 21 and an opening in the rear portion of the hammer case 4.

[0076] A bevel gear 35 is provided at the front end of the rotor shaft 33. The bevel gear 35 is a pinion gear that rotates integrally with the rotor 27. The bevel gear 35 is connected to at least a part of the reduction mechanism 7. The rotor shaft 33 is connected to the reduction mechanism 7 via the bevel gear 35.

[0077] As shown in FIG. 6 , the reduction mechanism 7 is connected to a bevel gear 35, which is a pinion gear. 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 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 is disposed forward of the housing recess 85. The reduction mechanism 7 connects the rotor shaft 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 33.

[0078] The speed reduction mechanism 7 is composed of multiple speed reduction sections. The speed reduction mechanism 7 includes a first speed reduction section 41 and a second speed reduction section 42. The first speed reduction section 41 is connected to the pinion gear and rotates by slowing down the rotation of the pinion gear. The second speed reduction section 42 slows down the rotation of the first speed reduction section 41 and transmits it to the spindle 8.

[0079] The first reduction gear unit 41 has a driven gear 41A, a first intermediate gear 41B, and a first intermediate shaft 41C. The first intermediate shaft 41C extends in a direction intersecting the rotation axis AX. The first intermediate shaft 41C extends in a vertical direction perpendicular to the rotation axis AX and rotates around a vertical central axis. Both ends of the first intermediate shaft 41C are rotatably supported by intermediate bearings 41D. The intermediate bearings 41D are held by the hammer case 4. The intermediate bearings 41D are ball bearings. The driven gear 41A and the first intermediate gear 41B are fixed to the first intermediate shaft 41C. In this embodiment, the first intermediate gear 41B and the first intermediate shaft 41C are integral with each other. The first intermediate gear 41B and the first intermediate shaft 41C may be separate bodies. The driven gear 41A is attached to the lower part of the first intermediate shaft 41C, and the first intermediate gear 41B is attached to the upper part of the first intermediate shaft 41C. The driven gear 41A, the first intermediate gear 41B, and the first intermediate shaft 41C rotate integrally. The driven gear 41A is a bevel gear that meshes with the bevel gear 35, which is a pinion gear. The first intermediate gear 41B is a spur gear. The first intermediate gear 41B meshes with the second intermediate gear 42A of the second reduction gear section 42.

[0080] The second reduction gear unit 42 is disposed in front of the first reduction gear unit 41. The second reduction gear unit 42 has a second intermediate gear 42A and a second intermediate shaft 42B. The second intermediate shaft 42B extends in a direction intersecting the rotation axis AX. The second intermediate shaft 42B extends in a vertical direction perpendicular to the rotation axis AX and rotates around a vertical central axis. The first intermediate shaft 41C and the second intermediate shaft 42B are parallel to each other. Both ends of the second intermediate shaft 42B are rotatably supported by intermediate bearings 42C. The intermediate bearings 42C are held by the hammer case 4. The intermediate bearings 42C are sliding bearings. A second intermediate gear 42A is fixed to the second intermediate shaft 42B. The second intermediate gear 42A is attached to an upper portion of the second intermediate shaft 42B. The second intermediate gear 42A and the second intermediate shaft 42B rotate integrally. The second intermediate gear 42A is a spur gear. The second intermediate gear 42A meshes with the first intermediate gear 41B. The second intermediate gear 42A rotates by slowing down the rotation of the first intermediate gear 41B. The second intermediate gear 42A meshes with the spindle gear 8C of the spindle 8. The spindle gear 8C rotates integrally with the spindle 8. The spindle gear 8C is a spur gear.

[0081] When the rotor shaft 33 is rotated by the drive of the motor 6, the bevel gear 35 rotates, and the bevel gear 35 rotates the driven gear 41A. The rotation of the driven gear 41A causes the first intermediate shaft 41C to rotate at a rotational speed lower than the rotational speed of the rotor shaft 33. The rotation of the first intermediate shaft 41C causes the first intermediate gear 41B to rotate, and the first intermediate gear 41B rotates the second intermediate gear 42A. The rotation of the second intermediate gear 42A causes the second intermediate gear 42A to rotate at a rotational speed lower than the rotational speed of the first intermediate shaft 41C. The second intermediate gear 42A rotates the spindle gear 8C. The spindle gear 8C rotates at a rotational speed lower than the rotational speed of the second intermediate gear 42A. The rotation of the spindle gear 8C causes the spindle 8 to rotate. The spindle 8 rotates at a rotational speed lower than the rotational speed of the rotor shaft portion 33 .

[0082] The spindle 8 is connected to the reduction mechanism 7. The spindle 8 is rotated by the motor 6. The spindle 8 is arranged in front of the motor 6. The spindle 8 is arranged in front of the stator 26. The spindle 8 is arranged in front of the rotor 27. At least a portion of the spindle 8 is arranged in front of the reduction mechanism 7. The spindle 8 is rotated by the rotor 27. The spindle 8 is rotated by the rotational force of the rotor 27 transmitted by the reduction mechanism 7.

[0083] The spindle 8 extends in a direction intersecting the front-rear direction. The spindle 8 extends downward along a rotation axis BX that is perpendicular to the front-rear direction. The spindle 8 rotates around the rotation axis BX. The rotation axis BX of the spindle 8 and the rotation axis AX of the motor 6 are non-parallel and intersect with each other. The direction of the rotation axis BX of the spindle 8 may intersect with the front-rear direction (i.e., the rotation axis AX) at an angle between 80 degrees and 100 degrees. In this embodiment, the spindle 8, hammer 47, and anvil 10 are arranged along the rotation axis BX and rotate around the rotation axis BX.

[0084] The spindle 8 has a flange portion 8A and a spindle shaft portion 8B that protrudes downward from the flange portion 8A. The spindle gear 8C is provided on the outer periphery of the flange portion 8A.

[0085] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is held in the hammer case 4. The spindle 8 has a cylindrical portion 8D that protrudes upward from the top of the flange portion 8A. The spindle bearing 44 is arranged on the outer periphery of the cylindrical portion 8D. The spindle bearing 44 rotatably supports the outer periphery of the cylindrical portion 8D. The spindle bearing 44 is a sliding bearing. A cylindrical protrusion that protrudes downward is provided at the lower end of the spindle shaft portion 8B. The protrusion is arranged in an anvil recess 10C formed in the upper surface of the anvil 10. The lower part of the spindle 8 is rotatably supported by the anvil bearing 46 via the anvil 10.

[0086] The striking mechanism 9 is driven by a motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via a reduction mechanism 7 and a spindle 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the spindle 8 rotated by the motor 6. As shown in FIGS. 6 and 7 , 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. The striking mechanism 9 is disposed between the spindle 8 and the anvil 10 in the hammer case 4. The striking mechanism 9 is disposed below a flange portion 8A of the spindle 8.

[0087] The hammer 47 is disposed forward of the reduction mechanism 7. The hammer 47 is housed in the hammer case 4. The hammer 47 is rotated by the spindle 8. The hammer 47 is disposed around the spindle shaft 8B. The hammer 47 is held by the spindle shaft 8B. The ball 48 is disposed between the spindle shaft 8B and the hammer 47. The coil spring 49 is supported by each of the flange 8A and the hammer 47.

[0088] The hammer 47 has a body portion 47D, a hammer groove 47A, and a hammer protrusion 47B (see Figure 7). The body portion 47D is arranged around the spindle shaft portion 8B. The body portion 47D is annular. A recess 47C is provided at the rear portion of the body portion 47D. The recess 47C is provided so as to recess forward from the rear end portion of the body portion 47D. The recess 47C is ring-shaped. The hammer protrusion 47B protrudes forward from the body portion 47D. Two hammer protrusions 47B are provided.

[0089] 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 and the rotation axis BX of the spindle 8 coincide with each other. The hammer 47 rotates around the rotation axis BX.

[0090] 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 8F in which at least a portion of the ball 48 is disposed. The spindle groove 8F is provided on a portion of the outer circumferential surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47A in which at least a portion of the ball 48 is disposed. The hammer groove 47A is provided on a portion of the inner surface of the body portion 47D. The ball 48 is disposed between the spindle groove 8F and the hammer groove 47A. The ball 48 can roll inside the spindle groove 8F and inside the hammer groove 47A. The hammer 47 is movable along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial and rotational directions within a movable range defined by the spindle groove 8F and the hammer groove 47A.

[0091] The coil spring 49 generates an elastic force that moves the hammer 47 downward. The coil spring 49 is disposed between the flange portion 8A and the hammer 47. The lower portion of the coil spring 49 is disposed in a ring-shaped recess 47C provided on the rear surface of the hammer 47. A washer 45 is disposed inside the recess 47C. The washer 45 is supported by the body portion 47D via a ball 50. The upper end portion of the coil spring 49 is supported by the flange portion 8A. The lower end portion of the coil spring 49 is supported by the washer 45. The hammer 47 and the coil spring 49 are capable of relative rotation around the rotation axis BX due to the presence of the washer 45 and the ball 50.

[0092] The anvil 10 is an output part of the impact tool 1. The anvil 10 rotates due to the rotational force of the motor 6. At least a portion of the anvil 10 is disposed below the hammer 47. The anvil 10 is struck directly or indirectly by the hammer 47 in the rotational direction. In this embodiment, the anvil 10 is struck directly by the hammer 47.

[0093] The anvil 10 has a rod-shaped anvil shaft portion 10A and an anvil protrusion portion 10B. An anvil recess 10C that receives the protrusion portion of the spindle shaft portion 8B is provided at the upper end of the anvil 10. The anvil protrusion portion 10B is provided at the upper end of the anvil 10. The anvil protrusion portion 10B protrudes radially outward from the upper end of the anvil shaft portion 10A. The anvil shaft portion 10A protrudes downward from the inside of the hammer case 4, passing through the cylindrical portion 82, to the outside of the hammer case 4. The lower end of the anvil shaft portion 10A is exposed to the outside of the hammer case 4. A tool holder 51 is disposed at the lower end of the anvil 10. The tool holder 51 is provided at the exposed portion of the lower end of the anvil shaft portion 10A.

[0094] In the impact wrench according to the embodiment, the tool holder 51 is a square prism-shaped engaging portion that engages with an engaging recess of the socket, which is the tool. The socket is held in a fitted state in the tool holder 51.

[0095] The anvil 10 is rotatably supported by an anvil bearing 46 (see FIG. 7). The rotation axis of the anvil 10 coincides with the rotation axis BX of the spindle 8. The anvil 10 rotates around the rotation axis BX. The anvil bearing 46 is disposed inside the cylindrical portion 82. The anvil bearing 46 is disposed inside the cylindrical portion 82 of the hammer case 4. The anvil bearing 46 is held in the cylindrical portion 82. The cylindrical portion 82 is disposed around the anvil shaft portion 10A. The anvil bearing 46 rotatably supports the anvil shaft portion 10A. In this embodiment, the anvil bearing 46 is a plain bearing. A ring-shaped groove 46A facing the anvil bearing 46 is provided in the anvil shaft portion 10A. A ring-shaped seal member 46B is disposed in the groove 46A. In addition, a washer 52 is provided on the inner bottom surface of the hammer case 4. The washer 52 faces the anvil protrusion 10B.

[0096] The hammer protrusion 47B can come into contact with the anvil protrusion 10B. When the motor 6 is driven while the hammer protrusion 47B and the anvil protrusion 10B are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0097] The anvil 10 is struck in the rotational direction by the hammer 47. For example, during a screw tightening operation, if the load acting on the anvil 10 becomes too high, a situation may arise in which the anvil 10 cannot be rotated by the power generated by the motor 6 alone. When the power generated by the motor 6 alone is no longer sufficient to rotate the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are movable relative to each other in the axial and circumferential directions via the ball 48. Even after the rotation of the hammer 47 stops, the rotation of the spindle 8 continues 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 upward while being guided by the spindle groove 8F and the hammer groove 47A. The hammer 47 receives force from the ball 48 and moves upward along with the ball 48. In other words, the hammer 47 moves upward due to the rotation of the spindle 8 while the rotation of the anvil 10 is stopped. As the hammer 47 moves upward, the contact between the hammer protrusion 47B and the anvil protrusion 10B is released.

[0098] The coil spring 49 generates an elastic force that moves the hammer 47 downward. After moving upward, the hammer 47 moves downward due to the elastic force of the coil spring 49. As the hammer 47 moves downward, it receives a rotational force from the ball 48. That is, the hammer 47 moves downward while rotating. As the hammer 47 moves downward while rotating, the hammer protrusion 47B comes into contact with the anvil protrusion 10B while rotating. As a result, the anvil protrusion 10B 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 BX with high torque.

[0099] The fan 12 rotates due to the rotational force of the motor 6. As shown in FIG. 5, the fan 12 is disposed forward of the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the front portion of the rotor shaft 33. The fan 12 is disposed between the bearing 38F and the stator 26. The fan 12 rotates due to the rotation of the rotor 27. As the rotor shaft 33 rotates, the fan 12 rotates together with the rotor shaft 33. As the fan 12 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake 19. The air that has flowed into the internal space of the housing 2 circulates through the internal space of the housing 2, thereby cooling the motor 6. As the fan 12 rotates, the air that has circulated through the internal space of the housing 2 flows out into the external space of the housing 2 through the air exhaust 20.

[0100] As shown in FIGS. 1 and 5, the operation panel 16 is provided in the motor housing portion 21. The operation panel 16 is exposed to the outside through a panel opening 21B formed in the top surface of the motor housing portion 21. The operation panel 16 is disposed near the boundary between the rear of the motor housing portion 21 and the grip portion 22. The operation panel 16 is disposed forward of the trigger lever 14. At least a portion of the operation panel 16 overlaps vertically with the motor 6. At least a portion of the operation panel 16 overlaps vertically with the bearing 38R.

[0101] FIG. 8 is a perspective view showing the operation panel 16 according to the embodiment. FIG. 8 shows a state in which a right side part of the housing 2 has been removed, exposing a portion of the operation panel 16. The operation panel 16 is plate-shaped. The operation panel 16 has operation buttons 16A, an indicator display 16B, and a circuit board 16C. The operation buttons 16A and the indicator display 16B are fixed to the circuit board 16C via a frame-shaped bracket 16D. The bracket 16D fits into the panel opening 21B. The circuit board 16C is provided with the operation buttons 16A and the indicator display 16B and is connected to the controller 18 by wiring. The motor housing 21 is provided with a holding groove 21C directly below the panel opening 21B, which supports the outer periphery of the circuit board 16C. The operation panel 16 is held in the motor housing 21 by fitting the outer periphery of the circuit board 16C into the holding groove 21C. The operation panel 16 outputs a signal according to the input of the operation button 16A to the controller 18, and displays information on the indicator display 16B according to the signal from the controller 18.

[0102] When the operator operates the operation button 16A, the controller 18 switches the operation mode of the motor 6. The indicator display 16B has a light-emitting element. The light-emitting element is, for example, an LED light-emitting element. The indicator display 16B displays the operation mode of the motor 6 by changing the lighting pattern of the multiple light-emitting elements. The operation modes include, for example, operation modes of strong, medium, and weak, which set the rotation speed of the motor 6 in three different stages, a mode in which the motor 6 is stopped based on detection that the impact by the impact mechanism 9 has started, and a mode in which the motor 6 is stopped or switched to low-speed rotation based on detection of nut rotation when loosening a nut.

[0103] FIG. 9 is a schematic diagram showing the attachment of the battery pack 25 to the battery holding portion 23 according to the embodiment. FIG. 9 shows a state in which the right side part of the housing 2 has been removed to expose the interior of the battery holding portion 23. As shown in FIGS. 4 and 9 , the battery attachment portion 13 is disposed below the battery holding portion 23. The battery pack 25 is attached to the battery attachment portion 13. The battery pack 25 is detachable from the battery attachment portion 13. The battery attachment portion 13 holds the battery pack 25 so that it can slide forward and backward. When the battery pack 25 slides forward from the rear of the battery attachment portion 13 and reaches the engagement position, the battery attachment portion 13 engages with the engagement hook 25A of the battery pack 25 to restrict the rearward sliding movement of the battery pack 25. The battery pack 25 is provided with a release button that moves the engagement hook 25A up and down. When the release button is pressed, the engagement hook 25A retracts downward, releasing the engagement with the battery attachment portion 13. This allows the battery pack 25 to be attached or detached.

[0104] The battery pack 25 functions as a power source for the impact tool 1. The battery pack 25 includes a secondary battery. In this embodiment, the battery pack 25 includes a rechargeable lithium-ion battery. When attached to the battery attachment portion 13, the battery pack 25 can supply power to the impact tool 1. The motor 6 and the light unit 17 are each driven by the power supplied from the battery pack 25.

[0105] The controller 18 operates based on power supplied from the battery pack 25 .

[0106] The controller 18 outputs a control signal for controlling the motor 6. The controller 18 includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a central processing unit (CPU), a non-volatile memory such as a read-only memory (ROM) or storage, a volatile memory such as a random access memory (RAM), a field effect transistor (FET), and a resistor. The controller 18 sets the operation mode of the impact tool 1 based on the operation of the operation panel 16. Setting parameters for the operation mode of the impact tool 1 include a current threshold and on / off control conditions for the motor 6. The controller 18 outputs a signal to the operation panel 16 to display the setting status of the operation mode.

[0107] The controller 18 is housed in the battery holding section 23. The controller 18 is disposed above the battery attachment section 13. The controller 18 is aligned in the front-rear and left-right directions. The controller 18 is disposed so as to overlap the upper surface of the battery attachment section 13. The battery holding section 23 has a dome-shaped outer shape in which a storage space for the controller 18 is formed.

[0108] As shown in FIG. 4, 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. A switch body 14A is disposed on top of the trigger lever 14. The switch body 14A is disposed inside the grip portion 22. The switch body 14A is operated by operating the trigger lever 14. The operation of the switch body 14A generates a trigger signal. The controller 18 switches between driving and stopping the motor 6 based on the trigger signal.

[0109] The forward / reverse switching lever 15 is provided on the grip portion 22. The forward / reverse switching lever 15 is disposed above the trigger lever 14 on the left and right side surfaces 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.

[0110] The light unit 17 emits illumination light. The light unit 17 illuminates the anvil 10 and the area around the anvil 10 with the illumination light. The light unit 17 includes one or more light emitters 53. The light unit 17 includes chip on board light emitting diodes (COB LEDs).

[0111] (light unit) Fig. 10 is a longitudinal cross-sectional view along the front-rear direction showing the light unit 17 according to the embodiment. Fig. 11 is an exploded perspective view showing the structure of the light unit 17 according to the embodiment. Fig. 12 is a perspective view from below showing the front part of the impact tool according to the embodiment. Fig. 13 is an exploded perspective view from below showing the attachment of the light cover to the hammer case according to the embodiment. Fig. 14 is a perspective view from below showing the hammer case according to the embodiment. Fig. 15 is a bottom view of the hammer case with the light cover removed. Fig. 16 is a perspective view showing the light cover.

[0112] The light unit 17 is disposed on the underside of the hammer case 4. The light unit 17 is disposed around the cylindrical portion 82. The light unit 17 is disposed around the anvil 10 via the cylindrical portion 82. In the embodiment, the light unit 17 has an annular shape that surrounds the anvil 10.

[0113] The light unit 17 includes a plurality of light emitters 53. The light emitters 53 are LED (light emitting diode) elements. The light unit 17 has a substrate 54 on which the plurality of light emitters 53 are provided.

[0114] The light emitter 53 is held by the hammer case 4. The light emitter 53 is held on the underside of the hammer case 4. A plurality of light emitters 53 are provided around the anvil 10. The plurality of light emitters 53 are arranged along the circumferential direction of the anvil 10. The plurality of light emitters 53 are arranged in the rotational direction around the anvil 10. The light emitter 53 is arranged around at least a portion of the circumference of the anvil shaft portion 10A. The plurality of light emitters 53 are lined up along the rotational direction of the anvil 10. The light emitter 53 is mounted on the underside of the base plate 54.

[0115] Examples of the substrate 54 include an aluminum substrate, a glass cloth-based epoxy resin substrate (FR-4 substrate), or a composite substrate epoxy resin substrate (CEM-3 substrate). The light emitters 53 are mounted on the surface of the substrate 54. The light emitters 53 and the substrate 54 are connected via gold wires (not shown). The gold wires connect the multiple light emitters 53 to each other. The multiple light emitters 53 are surrounded by a bank 55. A phosphor 56 is disposed within the compartment surrounded by the bank 55. The light emitters 53 are covered by the phosphor 56. A pair of electrodes (not shown) is disposed on the front surface (front face) or rear surface (rear face) of the substrate 54 outside the bank. One electrode of the pair of electrodes is a positive electrode, and the other electrode is a negative electrode. Lead wires 65 are connected to each of the pair of electrodes. Power output from the battery pack 25 is supplied to the electrodes via the lead wires 65. The power supplied to the electrodes is supplied to the light emitters 53 via the substrate 54 and the gold wires. The light emitter 53 emits light based on the power supplied from the battery pack 25. The light unit 17 and the controller 18 are connected via a lead wire 65.

[0116] The substrate 54 has an annular shape surrounding the periphery of the cylindrical portion 82. A plurality of the light emitters 53 are arranged at intervals in the circumferential direction of the substrate 54. The number of the light emitters 53 is not limited as long as there is more than one. In the embodiment, 12 light emitters 53 are arranged at equal intervals in the circumferential direction of the cylindrical portion 82 (see FIG. 11).

[0117] The light unit 17 has an optical member 57 .

[0118] The optical member 57 is connected to the light unit 17. The optical member 57 is made of polycarbonate resin. In this embodiment, the optical member 57 is made of polycarbonate resin containing a white diffusing material. The optical member 57 is milky white. The optical member 57 transmits at least a portion of the light emitted from the light unit 17. The light transmittance of the optical member 57 is, for example, 40% or more and 70% or less. The optical member 57 diffuses the light of the multiple light emitters 53.

[0119] The optical member 57 is arranged to cover the front sides of the multiple light-emitting bodies 53. At least a portion of the optical member 57 is arranged forward of the light unit 17. The optical member 57 is continuous so as to straddle the multiple light-emitting bodies 53. The optical member 57 is formed in a ring shape that surrounds the anvil 10 so as to cover the multiple light-emitting bodies 53. The optical member 57 is annular. The optical member 57 has an outer cylinder portion 57A, an inner cylinder portion 57B, a light-transmitting portion 57C, and a convex portion 57D.

[0120] As shown in FIG. 10 , the outer cylinder portion 57A is disposed radially outward of the inner cylinder portion 57B. In the radial direction, the plurality of light emitters 53 are disposed between the outer cylinder portion 57A and the inner cylinder portion 57B. The inner cylinder portion 57B is disposed radially outward of the cylindrical portion 82 of the hammer case 4. The light transmitting portion 57C is disposed below the plurality of light emitters 53. The light transmitting portion 57C has an annular shape. The light transmitting portion 57C is disposed so as to connect the front end portion of the outer cylinder portion 57A and the front end portion of the inner cylinder portion 57B. The light transmitting portion 57C faces the lower surface of the substrate 54. The light transmitting portion 57C faces the light emitters 53. Light emitted from the light emitters 53 passes through the light transmitting portion 57C and is irradiated downward of the light unit 17. The lower surface of the light transmitting portion 57C forms the light emission surface of the light unit 17.

[0121] The protrusion 57D is disposed rearward of the light transmitting portion 57C. The protrusion 57D is provided so as to protrude rearward from the rear of the outer cylinder portion 57A. The protrusion 57D is disposed between a pair of guide projections 83 (see FIGS. 14 and 15) of the hammer case 4, and functions as a positioning portion for the light unit 17 in the rotational direction.

[0122] As shown in Figure 10, the upper surface of the substrate 54 is located below the upper ends of the outer tube portion 57A and the inner tube portion 57B. The substrate 54 and the plurality of light emitters 53 are located in a concave storage space defined by the outer tube portion 57A, the inner tube portion 57B, and the light-transmitting portion 57C of the optical member 57. The upper surface of the storage space is open. A molded resin 58 is filled into the storage space. The molded resin 58 fixes the plurality of light emitters 53 and the substrate 54 to the optical member 57 and to some of the lead wires 65.

[0123] The hammer case 4 holds the light unit 17. The light unit 17, which includes a plurality of light emitters 53, is held on the underside of the hammer case 4. The impact tool 1 includes a light cover 60 that is disposed on the underside of the hammer case 4, holds the light emitters 53, and covers the lead wires 65.

[0124] (light cover) As shown in Figures 12 and 13, the light cover 60 is separate from the motor housing portion 21. The light cover 60 is separate from the hammer case 4. The light cover 60 engages with the motor housing portion 21. The light cover 60 is attached to the underside of the hammer case 4. The light cover 60 holds the light unit 17 on the underside of the hammer case 4. The light unit 17 is held between the underside of the hammer case 4 and the light cover 60. The light cover 60 is made of, for example, resin.

[0125] The light cover 60 includes an illuminant holding portion 61 and a cover portion 62. The light cover 60 is a single member in which the illuminant holding portion 61 and the cover portion 62 are integrally formed. The illuminant holding portion 61 is separate from the motor housing portion 21. The cover portion 62 is separate from the motor housing portion 21. The illuminant holding portion 61 is separate from the hammer case 4. The cover portion 62 is separate from the hammer case 4.

[0126] The light emitter holding portion 61 is disposed on the underside of the hammer case 4 and holds a plurality of light emitters 53. The light emitters 53 and the light emitter holding portion 61 are disposed on the mounting surface 81. The light emitter holding portion 61 is provided circumferentially along the outer periphery of the optical member 57. The light emitter holding portion 61 is ring-shaped and surrounds the outer periphery of the optical member 57. The light emitter holding portion 61 has a peripheral wall portion 61A that surrounds the periphery of the optical member 57. The peripheral wall portion 61A is ring-shaped. The peripheral wall portion 61A extends in the vertical direction from the mounting surface 81 of the hammer case 4 to the lower surface of the optical member 57. The light emitter holding portion 61 has a locking portion 61B that protrudes radially inward from the lower end of the peripheral wall portion 61A. The locking portion 61B is provided around the entire inner periphery of the peripheral wall portion 61A. The locking portion 61B is located below the lower surface of the optical member 57. The locking portion 61B contacts the lower surface of the optical member 57 from below. The locking portion 61B locally contacts the outer peripheral edge of the lower surface of the optical member 57 so as to hook onto it. The locking portion 61B is located on the lower surface of the optical member 57, on the outer peripheral side of the light emitter 53. The light emitter holding portion 61 supports the lower surface of the optical member 57 at the locking portion 61B. As described above, the light unit 17 including the optical member 57, the light emitter 53, and the substrate 54 is integrated by the molded resin 58. Therefore, the light emitter holding portion 61 supports the entire light unit 17 including the light emitter 53 from below by supporting the lower surface of the optical member 57. The light emitter holding portion 61 exposes the lower surface of the optical member 57, at a position directly below the light emitter 53 and at a position more inward than the light emitter 53.

[0127] The light emitter holding portion 61 is fixed to the underside of the hammer case 4 by screws 60S, which tighten the light emitter holding portion 61 toward the underside of the hammer case 4. The light emitter holding portion 61 holds the multiple light emitters 53 by pressing the underside of the optical member 57 toward the hammer case 4 with the locking portion 61B. The light emitter holding portion 61 presses the outer peripheral edge of the underside of the optical member 57.

[0128] The light emitter holding portion 61 is fixed to the underside of the hammer case 4 at multiple locations around the optical member 57 with screws 60S. The light emitter holding portion 61 is fixed with four screws 60S at the four corner positions of the underside of the hammer case 4. Screw holes 81A are formed in a flat mounting surface 81 of the underside of the hammer case 4. The screw holes 81A are arranged at the four corner positions surrounding the periphery of the cylindrical portion 82. In other words, the four screw holes 81A are arranged at approximately 90-degree intervals in the rotational direction of the cylindrical portion 82. The peripheral wall portion 61A has boss portions 61H to which the screws 60S are attached. The boss portions 61H are arranged at the four corner positions surrounding the periphery of the cylindrical portion 82, corresponding to the screw holes 81A in the mounting surface 81. The boss portions 61H have insertion holes formed therein to allow the screws 60S to pass through. The screws 60S pass through the insertion holes of the boss portion 61H from below and are fixed into the screw holes 81A. The axial force of the screws 60S causes the light emitter holding portion 61 to press the optical member 57 upward toward the mounting surface 81 from the four corner positions around the optical member 57.

[0129] As shown in FIG. 10 , the impact tool 1 further includes a buffer member 59 disposed between the light emitter 53 and the lower surface of the hammer case 4. The buffer member 59 is disposed above the light unit 17. The buffer member 59 is an elastic member, such as a rubber material. The buffer member 59 protects the substrate 54 and the optical member 57 from contact with the hammer case 4, which is a metallic vibrating body. The buffer member 59 covers at least a portion of the upper surface of the light unit 17. The buffer member 59 allows the light unit 17 to be held between the mounting surface 81 of the hammer case 4 and the light emitter holder 61 while being spaced apart from the mounting surface 81.

[0130] The buffer member 59 is ring-shaped. The buffer member 59 overlaps with the light unit 17 around the entire circumference. The buffer member 59 is held in an elastically deformed state by being sandwiched between the light unit 17 and the mounting surface 81. The buffer member 59 is crushed by the light unit 17 by the axial force of the screw 60S. The buffer member 59 deforms to fit the shape of the upper surface of the light unit 17 so as to fill the gap between the light unit 17 and the mounting surface 81. The upper surface of the buffer member 59 contacts the mounting surface 81 and the cylindrical portion 82. The lower surface of the buffer member 59 contacts the light unit 17.

[0131] As shown in FIGS. 12 and 13 , the cover portion 62 covers the lead wires 65. The lead wires 65 extend from the motor housing portion 21. The lead wires 65 are connected to the plurality of light emitters 53. In other words, the lead wires 65 extend from the light unit 17 to the motor housing portion 21 along the underside of the hammer case 4. The lead wires 65 connect the plurality of light emitters 53 to the controller 18. The lead wires 65 (see FIG. 4 ) pass from the controller 18 through the battery holding portion 23 and the inside of the motor housing portion 21, and extend from the lower opening 21D on the front surface of the motor housing portion 21 to the underside of the hammer case 4. The lead wires 65 extend forward along the underside of the hammer case 4 and connect to the circuit board 54 of the light unit 17. As a result, the lead wires 65 are connected to the plurality of light emitters 53 on the circuit board 54 to supply power.

[0132] As shown in FIG. 15 , the lead wire 65 includes a first lead wire 65A extending from the motor housing portion 21 and a second lead wire 65B connected to the first lead wire 65A via a connector 66 and connected to the plurality of light emitters 53. The first lead wire 65A extends forward from the interior of the motor housing portion 21 through a lower opening 21D of the motor housing portion 21 and extends to the underside of the hammer case 4. A connector 66A is provided on one side of the first lead wire 65A. The second lead wire 65B extends rearward from the board 54 of the light unit 17 along the underside of the hammer case 4. A connector 66B is provided on the other side of the second lead wire 65B. When the connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B are connected, the first lead wire 65A and the second lead wire 65B are electrically connected. The connector 66A and the connector 66B can be attached and detached by inserting and removing them. When the connector 66B is separated from the connector 66A, the subassembly including the light unit 17, the second lead wire 65B, and the connector 66B can be separated from the impact tool 1.

[0133] As shown in Figures 14 and 15, the hammer case 4 has a groove 84 on the underside of the hammer case 4 in which the lead wire 65 is disposed. The groove 84 is a recessed portion that is recessed upward from the underside of the hammer case 4. The groove 84 is provided on the underside of the hammer case 4 in the front-to-rear direction, in a range from the rear end of the mounting surface 81 to the rear end of the hammer case 4. The first lead wire 65A and the second lead wire 65B are disposed in the groove 84. The connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B are coupled in the groove 84.

[0134] The impact tool 1 includes a ground wire 67 that extends from the motor housing portion 21 and connects to the underside of the hammer case 4. The ground wire 67 is connected to a ground terminal 84B provided on the underside of the hammer case 4. The ground terminal 84B is disposed in the groove portion 84. The ground wire 67 passes from the lower opening 21D of the motor housing portion 21 through the groove portion 84 and connects to the ground terminal 84B. The lead wire 65 and the ground wire 67 are disposed in the same groove portion 84.

[0135] The groove 84 has a narrow passage 84A at its rear end. The passage 84A extends to the rear surface of the hammer case 4. The lead wires 65 and the ground wire 67 extending from the lower opening 21D (see FIG. 13) of the motor housing 21 pass through the passage 84A. The passage 84A makes it possible to determine the starting positions of the lead wires 65 and the ground wire 67 on the underside of the hammer case 4 at the position of the passage 84A, and also makes it possible to bundle multiple wires together.

[0136] The cover portion 62 covers the lead wire 65 and the earth wiring 67. The cover portion 62 covers the groove portion 84 in which the lead wire 65 is arranged. The cover portion 62 covers the earth wiring 67 and the ground terminal 84B. The cover portion 62 extends from the arrangement position of the multiple light emitters 53 to the motor housing portion 21 on the underside of the hammer case 4. Specifically, the cover portion 62 extends rearward from the rear end portion of the light emitter holding portion 61. The cover portion 62 extends to the front surface of the motor housing portion 21. The cover portion 62 covers the entire groove portion 84.

[0137] 16, the cover part 62 has a cover recess 63 recessed downward from the upper surface side, opposite to the groove part 84. A space for accommodating wiring, which is constituted by the groove part 84 and the cover recess 63, is formed between the lower surface of the hammer case 4 and the cover part 62.

[0138] The cover portion 62 has claw portions 62A that engage with the motor housing portion 21. The claw portions 62A are arranged at the rear end of the cover portion 62. The claw portions 62A protrude rearward from the rear end of the cover portion 62. The claw portions 62A engage with the motor housing portion 21 by being inserted into the lower opening 21D of the motor housing portion 21 (see Figure 13). Due to the engagement between the motor housing portion 21 and the claw portions 62A, the rear end of the cover portion 62 can move in the front-to-rear direction but cannot move downward. The cover portion 62 is fixed to the hammer case 4 with the claw portions 62A engaged with the motor housing portion 21. The cover portion 62 covers the entire lower opening 21D of the motor housing portion 21.

[0139] As shown in FIGS. 12 and 13 , the light cover 60, which includes the light-emitting body holding portion 61 and the cover portion 62, covers substantially the entire lower surface of the hammer case 4. When assembling the impact tool 1, an assembler places the light unit 17 on the mounting surface 81 via the buffer member 59, connects the connectors 66A and 66B, and then attaches the light cover 60 to the hammer case 4. The light cover 60 is fixed to the hammer case 4 with the four boss portions 61H and screws 60S in a state in which the claw portions 62A are inserted into and engaged with the lower opening 21D of the motor housing portion 21. When replacing the light unit 17 for maintenance or the like, the light assembly including the light unit 17, the second lead wire 65B, and the connector 66B can be removed from the impact tool 1 simply by removing the light cover 60 from the hammer case 4 in the reverse order and then separating the connectors 66A and 66B.

[0140] (Bearing retention structure) Fig. 17 is a vertical cross-sectional view showing the periphery of the bevel gear 35 of the impact tool 1 according to the embodiment. Fig. 18 is an exploded perspective view showing the rear surface of the hammer case 4 according to the embodiment. Fig. 19 is an exploded perspective view showing the front surface of the motor housing portion 21 according to the embodiment. Fig. 20 is an exploded perspective view showing the bevel gear 35, bearing 38F, and intermediate support member 91 according to the embodiment. Fig. 21 is a vertical cross-sectional view showing the intermediate support member 91 according to the embodiment.

[0141] As described above, the impact tool 1 includes the bearing 38F that rotatably holds the bevel gear 35. The bearing 38F contacts the rotor shaft portion 33 and rotatably holds the bevel gear 35 via the rotor shaft portion 33. The bearing 38F is held by the hammer case 4. The bearing 38F is held at the rear of the hammer case 4.

[0142] 17, the impact tool 1 includes an intermediate support member 91 having a front surface that contacts the bearing 38F, and a fixed member FM that contacts the rear surface of the intermediate support member 91. The fixed member FM fixes the intermediate support member 91 together with the hammer case 4 simply by sandwiching it between them. Therefore, the bearing 38F is held by sandwiching the bearing 38F and the intermediate support member 91 that is disposed on the rear surface of the bearing 38F between the fixed member FM and the hammer case 4.

[0143] The fixed member FM may be an independent member, or may be integrally formed with a member provided in the impact tool 1 so as to constitute a part of the member. In the embodiment, the fixed member FM is integrally formed with the motor housing portion 21. The fixed member FM is a support wall 21G integrally formed with the motor housing portion 21. Therefore, the bearing 38F is sandwiched between the motor housing portion 21 and the hammer case 4, which are connected in the front-rear direction.

[0144] The bearing 38F is a ball bearing having an inner ring 71, an outer ring 72, and balls 73. The rotor shaft 33 is fitted into the inner ring 71. The front end of the inner ring 71 faces the rear surface of the bevel gear 35. The rear end of the inner ring 71 faces a stepped portion of the rotor shaft 33.

[0145] As shown in Figures 17 and 18, the hammer case 4 has an accommodating recess 85 that recesses forward from the rear of the hammer case 4 and accommodates the bearing 38F. The bearing 38F is disposed inside the accommodating recess 85. The hammer case 4 has an outer tubular portion 86 on which a case flange 4F is formed, and an inner tubular portion 87 on which the accommodating recess 85 is formed. The inner tubular portion 87 is formed radially inward from the outer tubular portion 86. The inner tubular portion 87 has a cylindrical shape, and its inner diameter decreases in a stepped manner. That is, the inner tubular portion 87 includes an accommodating recess 85 having an inner diameter D1 and a hole portion 88 having an inner diameter D2. The inner diameter D2 is smaller than the inner diameter D1. The accommodating recess 85 is a recess that recesses forward from the rear surface of the hammer case 4. The bearing 38F is disposed inside the accommodating recess 85. The bearing 38F contacts the inner peripheral surface of the accommodating recess 85 and the front surface of the accommodating recess 85 (the portion of the step with the hole 88) which corresponds to the bottom surface of the accommodating recess 85. The hole 88 is a through hole that is aligned with the rotation axis AX. The bevel gear 35 is disposed in the hole 88. The bevel gear 35 passes through the hole 88 and meshes with the driven gear 41A.

[0146] With this configuration, the hammer case 4 has a radial support surface 85A that supports the radial load acting on the bearing 38F and a front support surface 85B that supports the forward thrust load acting on the bearing 38F. The radial support surface 85A is the inner circumferential surface of the installation recess 85. The front support surface 85B is the front surface (bottom surface) of the installation recess 85.

[0147] The radial support surface 85A is annular. The outer ring 72 of the bearing 38F is fitted onto the radial support surface 85A. A groove 85D in which an O-ring 85C is disposed is provided in the radial support surface 85A. The O-ring 85C contacts the inner surface of the groove 85D and the outer ring 72.

[0148] The front support surface 85B is annular and faces the outer ring 72 of the bearing 38F in the front-rear direction. The front support surface 85B comes into contact with the front end surface of the outer ring 72.

[0149] 17, 19, and 20, the support wall 21G, which is the fixed member FM, directly or indirectly supports the rear surface of the bearing 38F on the front surface of the motor housing portion 21. In this embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via an intermediate support member 91. The support wall 21G forms part of the front surface of the motor housing portion 21.

[0150] Specifically, the front surface of the motor housing portion 21 includes a housing flange portion 21F with screw insertion holes 21H formed in the four corners, an annular rib 21E protruding forward from the housing flange portion 21F, and a support wall 21G. The annular rib 21E is disposed in the space between the outer cylinder portion 86 and the inner cylinder portion 87 of the hammer case 4. The inner cylinder portion 87 is disposed on the inner periphery of the annular rib 21E. A protrusion 21J protruding forward is provided at the bottom of the annular rib 21E. The protrusion 21J is inserted into an engagement hole 89 of the hammer case 4. The protrusion 21J and the engagement hole 89 determine the rotational position of the hammer case 4 about the rotation axis AX relative to the motor housing portion 21.

[0151] The support wall 21G is disposed inside the annular rib 21E. The support wall 21G extends radially inward from the annular rib 21E. A central opening 92 is formed in the support wall 21G, through which the rotor shaft portion 33 passes. The support wall 21G is ring-shaped. The support wall 21G faces the front support surface 85B of the accommodating recess 85 in the front-rear direction. The support wall 21G faces the bearing 38F in the front-rear direction. The support wall 21G faces the rear end surface of the outer ring 72 of the bearing 38F via an intermediate support member 91.

[0152] A recess 93 in which the intermediate support member 91 is disposed is formed in the front surface of the support wall 21G. The recess 93 is recessed rearward from the front surface. The recess 93 has a shape corresponding to the outer shape of the intermediate support member 91, and the intermediate support member 91 is disposed in the recess 93. The bottom surface of the recess 93 recessed rearward is a rear support surface 94 that comes into contact with the rear surface of the intermediate support member 91. The rear support surface 94 supports the rear thrust load acting on the bearing 38F. In this way, the motor housing portion 21 has a rear support surface 94 that supports the rear thrust load acting on the bearing 38F. The rear support surface 94 is the front surface of the support wall 21G and is also the bottom surface of the recess 93 in which the intermediate support member 91 is disposed.

[0153] The front surface of the intermediate support member 91 contacts the rear surface of the bearing 38F, and the rear surface of the intermediate support member 91 contacts the fixed member FM. The front surface of the intermediate support member 91 contacts the rear end surface of the outer ring 72 of the bearing 38F. The rear surface of the intermediate support member 91 contacts a rear support surface 94 of the front surface of the support wall 21G, which is the fixed member FM. The intermediate support member 91 is a flat plate with a constant thickness.

[0154] The intermediate support member 91 is provided along the rear surface of the bearing 38F. The front surface of the intermediate support member 91 extends circumferentially along the rear end surface of the outer ring 72 of the bearing 38F. The intermediate support member 91 is provided to surround the periphery of the rotor shaft portion 33 and has a C-shape including one end and the other end. That is, the intermediate support member 91 is non-ring-shaped, and a gap CL is formed between the one end and the other end. In this embodiment, the gap CL is larger than the diameter of the rotor shaft portion 33 in a cross section taken along the front surface of the intermediate support member 91. The inner circumference of the intermediate support member 91 is arc-shaped. Each side of the outer periphery of the intermediate support member 91 is linear, and the outer periphery of the intermediate support member 91 is rectangular except for the portion of the gap CL.

[0155] As described above, the fixing member FM fixes the intermediate support member 91 together with the hammer case 4 only by clamping it. "Fixed only by clamping" means that there is no structure for fixing the intermediate support member 91 with other members such as screws or rivets other than clamping the intermediate support member 91 between the fixing member FM and the hammer case 4. The intermediate support member 91 does not have any screw insertion holes.

[0156] Either the intermediate support member 91 or the fixed member FM elastically deforms the other. In other words, either the intermediate support member 91 or the fixed member FM is assembled in a state where it is compressed in the front-rear direction by the force that holds the intermediate support member 91. This eliminates a gap (backlash) in the front-rear direction of the bearing 38F between the hammer case 4 and the fixed member FM.

[0157] Either the intermediate support member 91 or the fixed member FM may be elastically deformed, but in this embodiment, as shown in FIG. 21 , the fixed member FM is elastically deformed. Specifically, the intermediate support member 91 has a higher hardness than the fixed member FM. The intermediate support member 91 is made of metal. The fixed member FM is made of resin. The fixed member FM sandwiches the intermediate support member 91 while elastically deforming. The intermediate support member 91 is sandwiched with its rear surface slightly recessed into the fixed member FM. For convenience, the deformed state of the fixed member FM is not shown in any of the figures other than FIG. 21 .

[0158] In the embodiment, the radial width W1 of the rear surface of the intermediate support member 91 is greater than the radial width W2 of the outer ring 72 (i.e., the thickness of the outer ring 72). Therefore, the intermediate support member 91 contacts the fixed member FM over a larger area than the outer ring 72, thereby fulfilling the function of dispersing the thrust load acting from the outer ring 72.

[0159] Here, the load acting on the bearing 38F will be described. In the embodiment, the bevel gear 35 and the driven gear 41A are spiral bevel gears. A spiral bevel gear is a bevel gear with tooth traces that curve in a spiral shape centered on the rotation axis. Compared to a straight bevel gear with tooth traces that extend linearly and radially, a spiral bevel gear has a larger contact area between gears and a larger number of simultaneously meshing teeth, resulting in high strength (high torque transmission), low noise, low vibration, and low wear.

[0160] When a spiral bevel gear transmits rotation, not only a radial load but also a thrust load is generated. The thrust load depends on the gear ratio of the bevel gear 35 and the driven gear 41A, but the direction of the thrust load may be reversed depending on the difference between forward and reverse rotation. Therefore, the bevel gear 35 may be subjected to a radial load in the diameter direction and thrust loads in both the forward and backward directions along the rotation axis AX.

[0161] 17, the thrust load acting on the bevel gear 35 is transmitted to the bearing 38F because the bevel gear 35 is fixed to the rotor shaft portion 33 and the inner ring 71 of the bearing 38F is fixed to the rotor shaft portion 33. The forward thrust load transmitted to the bearing 38F is supported by the front support surface 85B of the hammer case 4 via the outer ring 72. The rearward thrust load transmitted to the bearing 38F acts on the intermediate support member 91 via the outer ring 72 and is further supported by the rear support surface 94 of the support wall 21G, which is the fixed member FM, via the intermediate support member 91. If the thickness of the outer ring 72 is small, the contact point with the outer ring 72 will be close to line contact, and large surface pressure will act locally. However, by interposing the intermediate support member 91 between the outer ring 72 and the rear support surface 94 and increasing the contact area with the rear support surface 94, the surface pressure acting on the rear support surface 94 formed on the plastic motor housing portion 21 will be reduced.

[0162] The radial load acting on the bevel gear 35 acts on the bearing 38F via the rotor shaft portion 33 and is supported by the radial support surface 85A of the hammer case 4.

[0163] (Assembly workability of intermediate support members) FIG. 22 is an exploded perspective view showing a subassembly of the rotor 27 according to the embodiment. As shown in FIG. 22 , when assembling the impact tool 1, a subassembly is first assembled in which related components such as the bearing 38F and the intermediate support member 91 are attached to the rotor 27. These components are then attached to the rotor shaft 33 so that the fan 12, the intermediate support member 91, the bearing 38F, and the bevel gear 35 are arranged in this order from rear to rear. In this embodiment, because the intermediate support member 91 has a C-shape, the rotor shaft 33 can be passed through the gap CL to radially assemble the intermediate support member 91 to the rotor shaft 33. In other words, even if the bearing 38F and the bevel gear 35 are installed first, the intermediate support member 91 can be installed in the predetermined position later. Therefore, even if the intermediate support member 91 is forgotten to be installed, it can be addressed afterward, resulting in high assembly efficiency.

[0164] (How to use) A method of using the impact tool 1 according to the embodiment will now be described. For example, when performing fastening work on a work object, a socket, which is a tip tool, is attached to the tip tool holder 51. When the trigger lever 14 is operated by an operator, power is supplied from the battery pack 25, the motor 6 is started, and light is emitted from the light emitter 53 of the light unit 17. The light from the light unit 17 is emitted downward from around the anvil 10, so that the light can reach the work location even in a narrow, confined space with many obstacles. The light emitted from the light unit 17 has a high luminous intensity, and can brightly illuminate the work location.

[0165] The rotor 27 is rotated by driving the motor 6. When the rotor 27 rotates, the rotational force of the rotor 27 is transmitted to the spindle 8 via the speed reducing mechanism 7. The spindle 8 rotates at a rotational speed lower than the rotational speed of the rotor shaft 33. When the spindle 8 rotates while the hammer protrusion 47B and the anvil protrusion 10B are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8. As the anvil 10 rotates, the tool bit rotates, and the fastening operation progresses.

[0166] As the fastening operation progresses, if a load equal to or greater than a predetermined value acts on the anvil 10 via the tool bit, the rotation of the anvil 10 and hammer 47 stops. When the spindle 8 rotates while the hammer 47 is stopped, the hammer 47 moves upward. As the hammer 47 moves upward, the hammer protrusion 47B and the anvil protrusion 10B are released from contact with each other. The upwardly moving hammer 47 then moves downward while rotating due to the elastic force of the coil spring 49. As the hammer 47 moves downward while rotating, the anvil 10 is struck by the hammer 47 in the rotational direction. This causes the anvil 10 and the tool bit to rotate around the rotation axis BX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0167] (effect) As described above, in the embodiment, the impact tool 1 comprises a grip portion 22 extending in the front-to-rear direction, a motor housing portion 21 arranged in front of the grip portion 22, a motor 6 arranged inside the motor housing portion 21, a spindle 8 arranged in front of the motor 6, extending in a direction intersecting the front-to-rear direction, and rotated by the motor 6, a hammer 47 rotated by the spindle 8, an anvil 10 struck in the rotational direction by the hammer 47, a tool holder 51 arranged at the lower end of the anvil 10, a hammer case 4 accommodating the spindle 8 and the hammer 47, and an illuminant 53 held by the hammer case 4.

[0168] In the above configuration, in the impact tool 1 including the spindle 8 extending in a direction intersecting the front-rear direction, the hammer 47 rotated by the spindle 8, and the anvil 10 struck in the rotational direction by the hammer 47, the light emitter 53 is held in the hammer case 4 that houses the spindle 8 and the hammer 47. As a result, the light emitter 53 is disposed near the anvil 10, so that even when the tip end (anvil 10) of the impact tool 1 is inserted into a narrow space, the light from the light emitter 53 can reach the work location near the anvil 10. As a result, in the angle impact tool (impact tool 1), the light (light emitter 53) can appropriately illuminate the work location.

[0169] In this embodiment, the spindle 8 extends downward along a rotation axis BX that is perpendicular to the front-rear direction.

[0170] In the above configuration, the lower end of the impact tool 1, on which the spindle 8 is disposed, can be positioned in front of the work area to perform tightening. Since the hammer case 4 that houses the spindle 8 faces the work area directly, the light emitting body 53 held in the hammer case 4 can effectively illuminate the work area.

[0171] In this embodiment, the light emitter 53 is held on the lower surface of the hammer case 4 .

[0172] In the above configuration, when the tip (anvil 10) of the impact tool 1 is inserted into a narrow space, light can be irradiated from the bottom surface of the hammer case 4 toward the work location.

[0173] In the embodiment, the impact tool 1 further includes a buffer member 59 disposed between the light emitter 53 and the lower surface of the hammer case 4 .

[0174] In the above configuration, when the light-emitting body 53 is held in the hammer case 4 that houses the spindle 8 and the hammer 47, the buffer member 59 can reduce the transmission of vibrations caused by the impact of the hammer 47 to the light-emitting body 53.

[0175] In this embodiment, a plurality of light emitters 53 are provided around the anvil 10.

[0176] In the above configuration, light can be irradiated onto the work area from multiple locations around the anvil 10, further improving the visibility of the work area.

[0177] In the embodiment, the light emitters 53 are arranged along the circumferential direction of the anvil 10.

[0178] In the above configuration, the row of circumferential light emitters 53 can illuminate a wide area around the work location, and the formation of shadowed areas can be suppressed.

[0179] In an embodiment, the impact tool 1 further includes a lead wire 65 connected to the light emitter 53 and extending along the underside of the hammer case 4 to the motor housing portion 21, and a light cover 60 positioned on the underside of the hammer case 4, holding the light emitter 53 and covering the lead wire 65.

[0180] In the above configuration, not only the light emitting body 53 but also the lead wire 65 can be arranged on the underside of the hammer case 4, which makes it easier to assemble the impact tool 1.

[0181] In an embodiment, the impact tool 1 comprises a grip portion 22 extending in the front-to-rear direction, a motor housing portion 21 arranged in front of the grip portion 22, a motor 6 arranged inside the motor housing portion 21, a spindle 8 rotated by the motor 6, a hammer 47 moving relative to the spindle 8, an anvil 10 struck directly or indirectly in the rotational direction by the hammer 47, a tool holder 51 arranged at the lower end of the anvil 10, a plurality of light emitters 53 arranged around the anvil 10, a hammer case 4 accommodating the spindle 8 and the hammer 47, and an light emitter holder 61 separate from the motor housing portion 21, arranged on the underside of the hammer case 4, and holding the plurality of light emitters 53.

[0182] In the above configuration, an illuminant holder 61 that holds a plurality of illuminants 53 is disposed on the underside of the hammer case 4 that houses the spindle 8 and the hammer 47. As a result, the illuminants 53 are disposed near the anvil 10, so that even when the tip (anvil 10) of the impact tool 1 is inserted into a narrow space, light from the illuminants 53 can reach the work location near the anvil 10. As a result, in the angle impact tool, the light (illuminants 53) can appropriately illuminate the work location.

[0183] In this embodiment, the lower surface of the hammer case 4 has a flat mounting surface 81 and a cylindrical portion 82 that protrudes downward from the mounting surface 81 and through which the anvil 10 passes. The light emitter 53 and the light emitter holder 61 are arranged on the mounting surface 81.

[0184] In the above configuration, the light emitter 53 and the light emitter holder 61 can be placed on the mounting surface 81 near the anvil 10. Since the light emitter 53 can be positioned closer to the anvil 10, it is possible to more appropriately illuminate the work area even in a narrow space. The flat mounting surface 81 allows the light emitter 53 and the light emitter holder 61 to be easily and stably placed.

[0185] In the embodiment, the impact tool 1 includes an optical member 57 that is arranged to cover the plurality of light emitters 53 and diffuses light from the plurality of light emitters 53. The light emitter holding portion 61 holds the plurality of light emitters 53 by pressing the lower surface of the optical member 57 toward the hammer case 4.

[0186] In the above configuration, the optical member 57 can illuminate a wide area around the work location, preventing shadow areas from being formed. The light-emitting body holder 61 can collectively hold a plurality of light-emitting bodies 53 via the optical member 57.

[0187] In this embodiment, the light emitter holder 61 is fixed to the lower surface of the hammer case 4 by a screw 60S.

[0188] With the above configuration, the light emitter holding part 61 can be firmly fixed to the hammer case 4, and rattle and chatter of the light emitter holding part 61 can be suppressed even when the hammer case 4 vibrates due to the impact of the hammer 47. In addition, since the light emitter holding part 61 can be attached and detached with the screw 60S, the assembly workability and maintenance of the light emitter 53 are improved.

[0189] In this embodiment, the plurality of light emitters 53 are arranged along the circumferential direction of the anvil 10. The optical member 57 is formed in a ring shape surrounding the anvil 10 so as to cover the plurality of light emitters 53. The light emitter holder 61 is fixed to the underside of the hammer case 4 by screws 60S at a plurality of locations around the optical member 57.

[0190] In the above configuration, the circumferentially arranged plurality of light emitters 53 and the annular optical member 57 allow light to be emitted from the entire circumference of the anvil 10, thereby illuminating a wide area around the work site and preventing shadow areas from being formed. Even in this case, the light emitters 53 and the optical member 57 can be securely held by the light emitter holder 61.

[0191] In the embodiment, the light emitter holding portion 61 has a peripheral wall portion 61A that surrounds the periphery of the optical member 57. The peripheral wall portion 61A has a boss portion 61H to which a screw 60S is attached.

[0192] In the above configuration, the peripheral wall 61A of the light emitter holding part 61 can suppress light leakage in unnecessary directions around the optical member 57. By providing the boss part 61H on the peripheral wall 61A, the light emitter holding part 61 can be easily fixed to the hammer case 4 without excessively pressing the light emitter 53 or the optical member 57.

[0193] In an embodiment, the impact tool 1 comprises a grip portion 22 extending in the forward / backward direction, a motor housing portion 21 arranged in front of the grip portion 22, a motor 6 arranged inside the motor housing portion 21, a spindle 8 rotated by the motor 6, a hammer 47 moving relative to the spindle 8, an anvil 10 struck directly or indirectly in the rotational direction by the hammer 47, a tool holder 51 arranged at the lower end of the anvil 10, a plurality of light-emitting elements 53 arranged around the anvil 10, a hammer case 4 accommodating the spindle 8 and the hammer 47, lead wires 65 extending from the motor housing portion 21 and connected to the plurality of light-emitting elements 53, and a cover portion 62 separate from the motor housing portion 21, arranged on the underside of the hammer case 4, and covering the lead wires 65.

[0194] In the above configuration, since the plurality of light emitters 53 are arranged around the anvil 10, light from the light emitters 53 can reach the work location near the anvil 10 even when the tip (anvil 10) of the impact tool 1 is inserted into a narrow space. As a result, in the angle impact tool, the light (light emitters 53) can appropriately illuminate the work location. Furthermore, since the lead wires 65 connected to the plurality of light emitters 53 are routed from the outside (bottom surface) of the hammer case 4 and covered by the cover portion 62, the assembly workability of the plurality of light emitters 53 and ease of wiring are improved.

[0195] In the embodiment, the lead wire 65 includes a first lead wire 65A extending from the motor housing portion 21, and a second lead wire 65B connected to the first lead wire 65A via a connector 66 and connected to the plurality of light-emitting bodies 53. The cover portion 62 covers the connector 66, the first lead wire 65A, and the second lead wire 65B.

[0196] In the above configuration, the first lead wire 65A and the second lead wire 65B are connected via the connector 66 on the underside of the hammer case 4, and the connector 66, the first lead wire 65A, and the second lead wire 65B are covered by the cover part 62, so that the wiring of the multiple light emitters 53 can be connected and disconnected without disassembling the inside of the hammer case 4. As a result, the assembly workability and maintenance of the light emitters 53 are improved.

[0197] In this embodiment, the impact tool 1 further includes a ground wire 67 that extends from the motor housing portion 21 and connects to the underside of the hammer case 4. The cover portion 62 covers the lead wire 65 and the ground wire 67.

[0198] In the above configuration, not only the lead wire 65 connected to the light emitter 53 but also the ground wire 67 can be arranged on the underside of the hammer case 4, and the lead wire 65 and the ground wire 67 can be covered together by the cover part 62. As a result, it is possible to further improve the workability of assembling the light emitter 53. In addition, the device configuration can be simplified compared to when the lead wire 65 and the ground wire 67 are covered by separate members.

[0199] In this embodiment, the hammer case 4 has a groove 84 in which the lead wire 65 is disposed on the lower surface of the hammer case 4. The cover portion 62 covers the groove 84 in which the lead wire 65 is disposed.

[0200] In the above configuration, the lead wire 65 is placed in the groove portion 84, so that the lead wire 65 can be easily placed in the appropriate position during assembly, and the lead wire 65 can be prevented from being pinched between the hammer case 4 and the cover portion 62.

[0201] In this embodiment, the cover portion 62 extends from the position where the plurality of light emitters 53 are arranged on the underside of the hammer case 4 to the motor housing portion 21 .

[0202] In the above configuration, the area from the position where the light emitter 53 is disposed to the motor housing 21 is covered by the cover 62, so that the lead wires 65 can be prevented from being exposed to the outside from the cover 62 or the motor housing 21.

[0203] In the embodiment, the cover portion 62 has claw portions 62A that engage with the motor housing portion 21, and is fixed to the hammer case 4 with the claw portions 62A engaged with the motor housing portion 21.

[0204] In the above configuration, the cover portion 62 engages with the motor housing portion 21, thereby reliably covering the area from the position of the light emitter 53 to the motor housing portion 21. Furthermore, by engaging the claw portions 62A with the motor housing portion 21, it is possible to effectively prevent the cover portion 62 from separating from or shifting out of position with the motor housing portion 21.

[0205] In an embodiment, the impact wrench comprises a grip portion 22 extending in the front-to-rear direction, a motor housing portion 21 arranged in front of the grip portion 22, a motor 6 arranged inside the motor housing portion 21, a spindle 8 rotated by the motor 6 and arranged in front of the motor 6, a hammer 47 rotated by the spindle 8, an anvil 10 struck in the rotational direction by the hammer 47, a square pillar-shaped tip tool holding portion 51 arranged at the lower end of the anvil 10, a hammer case 4 that houses the spindle 8 and the hammer 47, and one or more light-emitting bodies 53 held by the hammer case 4.

[0206] In the above configuration, the light emitter 53 is held in the hammer case 4 that houses the spindle 8 and the hammer 47. As a result, the light emitter 53 is disposed near the anvil 10, so that even when the tip portion (anvil 10) of the impact wrench is inserted into a narrow space, the light from the light emitter 53 can reach the work location near the anvil 10. As a result, in the angle impact tool, the light (light emitter 53) can appropriately illuminate the work location.

[0207] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0208] Fig. 23 is a perspective view showing an intermediate support member 91A according to the second preferred embodiment. Fig. 24 is an exploded perspective view showing a subassembly of the motor 6 according to the second preferred embodiment.

[0209] In the first embodiment, an example was shown in which the intermediate support member 91 has a C-shape, but an intermediate support member 91A according to this second embodiment has an annular shape.

[0210] The intermediate support member 91A has an annular shape that fits along the rear surface of the bearing 38F. The intermediate support member 91A has a circular inner periphery and a roughly rectangular outer periphery. The four corners of the outer periphery of the intermediate support member 91A are chamfered. The annular intermediate support member 91A comes into contact with the rear surface of the bearing 38F over the entire circumference.

[0211] Unlike the C-shaped intermediate support member 91, the annular intermediate support member 91A cannot be radially assembled to the rotor shaft portion 33. Therefore, the fan 12, intermediate support member 91A, bearing 38F, and bevel gear 35 are assembled axially from the front to the rotor shaft portion 33 in this order.

[0212] (effect) As described above, in the second embodiment, the intermediate support member 91A has an annular shape that fits along the rear surface of the bearing 38F.

[0213] In the above configuration, the annular intermediate support member 91A can support the thrust load over the entire circumference of the bearing 38F.

[0214] [Third embodiment] A third embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0215] FIG. 25 is a cross-sectional view showing an intermediate support member 91B according to the third embodiment.

[0216] In the second embodiment, the intermediate support member 91A has a circular inner periphery and a rectangular outer periphery, but the intermediate support member 91B according to the third embodiment has an annular shape.

[0217] The intermediate support member 91B has an annular shape that fits along the rear surface of the bearing 38F. The intermediate support member 91B has a circular inner periphery and a circular outer periphery. In other words, the intermediate support member 91B is an annular washer. The annular intermediate support member 91B contacts the rear surface of the bearing 38F over the entire circumference. The intermediate support member 91B is a flat plate with a constant thickness.

[0218] When assembling the subassembly, the fan 12, the intermediate support member 91B, the bearing 38F, and the bevel gear 35 are attached to the rotor shaft portion 33 from the front in the axial direction in this order.

[0219] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0220] Fig. 26 is a cross-sectional view showing an intermediate support member 91C according to the fourth embodiment, and Fig. 27 is a vertical cross-sectional view showing the periphery of the intermediate support member 91C according to the fourth embodiment.

[0221] In the third embodiment, the intermediate support member 91B is in the shape of a ring with a constant thickness, but the intermediate support member 91C according to this fourth embodiment has a stepped ring shape.

[0222] The intermediate support member 91C has an annular shape that fits along the rear surface of the bearing 38F. The intermediate support member 91C has a circular inner periphery and a circular outer periphery. In other words, the intermediate support member 91C is annular. The annular intermediate support member 91C contacts the rear surface of the bearing 38F over the entire circumference.

[0223] Intermediate support member 91C has a step between its inner and outer peripheries that is offset in the thickness direction. In other words, intermediate support member 91C has an outer periphery 101 and an inner periphery 102 that is more inward than outer periphery 101, with outer periphery 101 being offset forward of inner periphery 102. Note that the thickness of intermediate support member 91C is constant, and the thickness of inner periphery 102 and that of outer periphery 101 are substantially the same.

[0224] In the fourth embodiment, the fixed member FM (support wall 21G) of the motor housing portion 21 is provided with an outer circumferential mounting portion 103 that contacts the rear surface of the outer circumferential portion 101 of the intermediate support member 91C, and an inner circumferential mounting portion 104 that contacts the rear surface of the inner circumferential portion 102 of the intermediate support member 91C. The outer circumferential mounting portion 103 and the inner circumferential mounting portion 104 are shifted forward relative to the inner circumferential mounting portion 104 in response to the misalignment between the outer circumferential portion 101 and the inner circumferential portion 102 in the front-to-rear direction.

[0225] In the fourth embodiment, the position of the peripheral wall constituting the accommodating recess 85 of the hammer case 4 is also shifted forward to correspond to the outer periphery of the intermediate support member 91C and the outer periphery mounting portion 103 of the motor housing portion 21. As a result, the depth D3 (depth from the rear surface to the front) of the accommodating recess 85 of the hammer case 4 is smaller than the thickness D4 of the bearing 38F in the front-to-rear direction. The bearing 38F protrudes rearward beyond the rear end of the accommodating recess 85. The rear end of the bearing 38F is located rearward of the outer periphery 101 of the intermediate support member 91C and contacts the front surface of the inner periphery 102 of the intermediate support member 91C.

[0226] In this structure, a rearward thrust load acting on the bearing 38F is applied to the inner peripheral portion 102 of the intermediate support member 91C. Because the intermediate support member 91C is in contact with the motor housing 21 at both the inner peripheral portion 102 and the outer peripheral portion 101, the thrust load applied to the intermediate support member 91C is supported at both the inner peripheral portion 102 and the outer peripheral portion 101 by the inner peripheral mounting portion 104 and the outer peripheral mounting portion 103, respectively.

[0227] In the fourth embodiment, since the outer peripheral mounting portion 103 is shifted forward, a thickness required to support a thrust load can be provided on the forward side in the support wall 21G of the motor housing portion 21. Accordingly, the rear surface of the support wall 21G of the motor housing portion 21 can be shaped so as not to protrude rearward, making it easy to ensure installation space for the fan 12.

[0228] [Fifth embodiment] A fifth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0229] FIG. 28 is a vertical cross-sectional view showing an intermediate support member 91D and a fixed member FM according to the fifth embodiment.

[0230] In the first embodiment, an example was shown in which, of the intermediate support member 91 and the fixed member FM, the fixed member FM elastically deforms, but in this fifth embodiment, an example is shown in which, of the intermediate support member 91D and the fixed member FM, the intermediate support member 91D elastically deforms.

[0231] In the fifth embodiment, the intermediate support member 91D is made of resin. The fixed member FM is made of metal. The fixed member FM sandwiches the intermediate support member 91D while elastically deforming it. Also, in the fifth embodiment, the bearing 38F is a sliding bearing.

[0232] In the fifth embodiment, the intermediate support member 91D and the bearing 38F are held by being sandwiched in the front-rear direction between a metal hammer case 4 and a metal fixing member FM. The fixing member FM fixes the intermediate support member 91D together with the hammer case 4 simply by sandwiching them.

[0233] The intermediate support member 91D is elastically deformed by being sandwiched between the fixed member FM and the bearing 38F. The intermediate support member 91D is deformed so that the rear surface of the bearing 38F bites into the front surface of the intermediate support member 91D. This prevents a gap (backlash) from occurring between the fixed member FM and the hammer case 4 at the front and rear of the bearing 38F.

[0234] (effect) As described above, in the fifth embodiment, the intermediate support member 91D is made of resin, and the fixing member FM is made of metal, and sandwiches the intermediate support member 91D while elastically deforming it.

[0235] In the above configuration, by using the intermediate support member 91D as a spacer or cushion, it is possible to prevent the occurrence of a gap (backlash) in the direction in which the thrust load acts on the bearing 38F.

[0236] [Sixth embodiment] A sixth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0237] FIG. 29 is a vertical cross-sectional view showing the front part of an impact tool 1A according to the sixth embodiment.

[0238] In the first embodiment, an example was shown in which the bevel gear 35 was a pinion gear fixed to the rotor shaft portion 33, but in this sixth embodiment, the bevel gear 135 is provided separately from the pinion gear fixed to the rotor shaft portion 33, and the bevel gear 135 is provided on an axis separate from the rotor shaft portion 33.

[0239] The impact tool 1A according to the sixth embodiment includes a bevel gear 135 that is indirectly rotated by the rotor 27 and has a shaft 111 that extends in the front-to-rear direction. The impact tool 1A also includes a spur gear 112 that is a pinion gear that is directly rotated by the rotor 27. The bevel gear 135 rotates around the shaft 111 due to the rotational force of the spur gear 112.

[0240] The spur gear 112 is fixed to the rotor shaft portion 33. The spur gear 112 is fixed by being press-fitted onto the tip of the rotor shaft portion 33. The spur gear 112 rotates together with the rotor 27 (rotor shaft portion 33). The rotor shaft portion 33 is rotatably held by a rotor bearing 113F. The spur gear 112 meshes with a driven gear 114.

[0241] The driven gear 114 is a spur gear. The driven gear 114 is fixed to the rear end of the shaft 111. The driven gear 114 is fixed by being press-fitted into the rear end of the shaft 111. The driven gear 114 rotates together with the shaft 111 and the bevel gear 135. The driven gear 114 rotates by reducing the rotation speed of the spur gear 112. The driven gear 114 constitutes the first-stage reduction section of the reduction mechanism 7.

[0242] The shaft 111 extends in the front-rear direction. The shaft 111 is parallel to the rotation axis AX of the motor 6. The shaft 111 is housed in the hammer case 4. The shaft 111 is disposed at a position offset in the radial direction from the rotation axis AX.

[0243] The bevel gear 135 is disposed forward of the spur gear 112 and the driven gear 114. The bevel gear 135 is formed integrally with the tip of the shaft 111, or is a separate piece fixed to the tip of the shaft 111. The bevel gear 135 is housed in the hammer case 4. The bevel gear 135 rotates around the central axis of the shaft 111. The bevel gear 135 meshes with a first intermediate gear 115A provided on an intermediate shaft 115C.

[0244] The intermediate shaft 115C extends in a direction intersecting the rotation axis AX and the axis 111. The intermediate shaft 115C extends in a vertical direction perpendicular to the rotation axis AX and the axis 111 and is rotatable around a vertical central axis. Both ends of the intermediate shaft 115C are rotatably supported by intermediate bearings 116. The intermediate bearings 116 are held by the hammer case 4. A first intermediate gear 115A and a second intermediate gear 115B are fixed to the intermediate shaft 115C. The intermediate shaft 115C, the first intermediate gear 115A, and the intermediate shaft 115C rotate together. The first intermediate gear 115A meshes with the bevel gear 135. The first intermediate gear 115A is a bevel gear. The first intermediate gear 115A rotates by slowing down the rotation of the bevel gear 135. The bevel gear 135 and the first intermediate gear 115A constitute a second-stage reduction gear of the reduction mechanism 7. The second intermediate gear 115B is a spur gear. The second intermediate gear 115B meshes with a spindle gear 8C of the spindle 8. The spindle gear 8C rotates by reducing the rotation speed of the second intermediate gear 115B. The second intermediate gear 115B and the spindle gear 8C constitute a third-stage reduction gear of the reduction mechanism 7.

[0245] The bearing 139 is supported by the hammer case 4 and rotatably holds the bevel gear 135. The bearing 139 comes into contact with the shaft 111 and rotatably supports the shaft 111. The bearing 139 rotatably holds the bevel gear 135 via the shaft 111.

[0246] The bearing 139 is accommodated in the accommodation recess 118 of the hammer case 4. The accommodation recess 118 has a radial support surface 118A and a front support surface 118B. The bearing 139 is a ball bearing. In the example of FIG. 29, two sets of bearings 139 are provided side by side in the axial direction.

[0247] The intermediate support member 91E has a front surface that contacts the bearing 139. The intermediate support member 91E may be C-shaped or annular. In the sixth embodiment, the intermediate support member 91E is housed in the hammer case 4. The intermediate support member 91E covers a portion of the rear opening of the accommodating recess 118. The intermediate support member 91E contacts the rear end surface of the outer ring of the rear bearing 139 disposed in the accommodating recess 118.

[0248] In the sixth embodiment, the fixed member FM is provided separately from the motor housing portion 21 and the hammer case 4. In the sixth embodiment, the fixed member FM is made of metal and is a gear case that houses the spur gear 112 and the driven gear 114. The fixed member FM is disposed between the hammer case 4 and the motor housing portion 21 so as to straddle both the hammer case 4 and the motor housing portion 21 in the front-to-rear direction.

[0249] The fixing member FM includes a first housing chamber 121 recessed rearward from the front surface and a second housing chamber 122 recessed forward from the rear surface. The first housing chamber 121 houses the spur gear 112 and the driven gear 114. The second housing chamber 122 houses the rotor bearing 113F. The second housing chamber 122 is continuous with the first housing chamber 121 in the front-rear direction. The tip end of the rotor shaft portion 33 is disposed in the first housing chamber 121 through the second housing chamber 122.

[0250] The hammer case 4 has a front housing portion 119 that houses the front portion of the fixed member FM. The front housing portion 119 is a recess that recesses forward from the rear surface of the hammer case 4. An accommodation recess 118 for the bearing 139 is formed in the front wall surface that corresponds to the bottom surface of the front housing portion 119. The front housing portion 119 and the accommodation recess 118 are continuous. Therefore, the intermediate support member 91E is disposed on the front wall surface that corresponds to the bottom surface of the front housing portion 119. The front portion of the fixed member FM fits into the front housing portion 119. As a result, the front surface of the fixed member FM comes into contact with the rear surface of the intermediate support member 91E. The fixed member FM comes into contact with the rear surface of the intermediate support member 91E at the front end surface of the peripheral wall that defines the first housing chamber 121.

[0251] The motor housing portion 21 has a rear housing portion 120 that houses the rear portion of the fixed member FM. The rear housing portion 120 is a recess that recesses rearward from the front surface of the motor housing portion 21. The rear portion of the fixed member FM fits into the rear housing portion 120. Although not shown, the motor housing portion 21 and the hammer case 4 are connected in the front-rear direction and fastened together by screws 70 facing in the front-rear direction, as in the first embodiment. The axial force of the screws 70 tightens the motor housing portion 21 and the hammer case 4 in a direction that moves them closer to each other in the front-rear direction. As a result, the bearing 139, the intermediate support member 91E, and the fixed member FM are sandwiched between the motor housing portion 21 and the hammer case 4 and held in place by the axial force of the screws 70. As a result, the fixed member FM fixes the intermediate support member 91E together with the hammer case 4 simply by sandwiching them together. The intermediate support member 91E is simply placed in the front housing portion 119, and is fixed together with the bearing 139 by being sandwiched between the front surface of the fixed member FM and the front support surface 118B of the hammer case 4.

[0252] [Other embodiments] In the above-described embodiment, the multiple light emitters 53 do not have to be arranged along the circumferential direction of the anvil 10. The multiple light emitters 53 may be arranged, for example, radially in the radial direction of the anvil 10. The optical member 57 does not have to be annular and surround the anvil 10, and may have a shape corresponding to the arrangement of the multiple light emitters 53. The optical member 57 may be, for example, arc-shaped, rectangular, or radial. An optical member 57 may be provided individually for each light emitter 53. The multiple light emitters 53 may be held by the hammer case 4 and may be arranged at the rear of the lower surface of the hammer case 4 or at the lower part of the side surface. For example, the light emitter 53 may emit light obliquely downward from the rear of the lower surface of the hammer case 4, toward the bottom of the anvil 10. The number of light emitters 53 does not have to be multiple, and only one may be provided.

[0253] In the above-described embodiment, the impact tool 1 is an impact wrench. The impact tool 1 may also be an impact driver. When the impact tool 1 is an impact driver, the tool holder 51 includes a bit hole provided at the lower end of the anvil shaft 10A. The bit hole is provided so as to extend rearward from the front end of the anvil shaft 10A. A driver bit, which is a tool, is inserted and held in the bit hole. In this case, the tool holder 51 may be provided with a tool holding mechanism that is inserted into the bit hole and removably holds the driver bit.

[0254] In the above-described embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via the intermediate support member 91, but the intermediate support member 91 need not be provided, and the support wall 21G may directly support the rear surface of the bearing 38F.

[0255] In the above-described embodiment, the power source for the impact tool 1 does not have to be the battery pack 25, and may be a commercial power source (AC power source).

[0256] [Seventh embodiment] A seventh embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0257] Fig. 30 is a perspective view from below showing the front part of the impact tool 1B according to the seventh embodiment.Fig. 31 is a bottom view showing the front part of the impact tool 1B according to the seventh embodiment.

[0258] In the first embodiment, an example was shown in which the light unit 17 had an annular shape surrounding the anvil 10, but the light unit 201 in this seventh embodiment has a non-annular shape and is located at a position farther away from the anvil 10 than in the first embodiment.

[0259] The light unit 201 is disposed on the underside of the hammer case 4. The light unit 201 is disposed around the cylindrical portion 82. The light unit 201 is disposed around the anvil 10 via the cylindrical portion 82. In the seventh embodiment, the light unit 201 does not surround the anvil 10, but is provided so as to be localized behind the anvil 10.

[0260] The light unit 201 includes a plurality of light emitters 53. The light emitters 53 are held by the hammer case 4. The light emitters 53 are held on the lower surface of the hammer case 4. A plurality of light emitters 53 are provided around the anvil 10.

[0261] In the seventh embodiment, the multiple light emitters 53 are arranged along the radial direction of the anvil 10. The multiple light emitters 53 are arranged rearward of the anvil 10 in the radial direction of the anvil 10. The multiple light emitters 53 are arranged in a straight line behind the anvil 10. The multiple light emitters 53 may be arranged rearward of the anvil 10 along the rotational direction (circumferential direction) of the anvil 10, or may be arranged in a straight line along the left-right direction. The arrangement of the multiple light emitters 53 is not limited to a linear arrangement, and they may also be arranged in a planar (array) arrangement in a predetermined pattern such as vertically or horizontally.

[0262] Fig. 32 is an exploded perspective view from below showing the attachment of the light cover 204 to the hammer case 4 according to the seventh embodiment. Fig. 33 is a vertical cross-sectional view taken along the front-rear direction showing the light unit 201 according to the seventh embodiment.

[0263] The light unit 201 has a substrate 202 on which a plurality of light emitters 53 are provided, and an optical member 203. The substrate 202 is formed in a linear shape (rectangular shape) along the front-rear direction in accordance with the linear arrangement of the plurality of light emitters 53. The light emitters 53 are arranged at intervals in the front-rear direction on the underside of the substrate 202. In the embodiment, two light emitters 53 are arranged. The number of light emitters 53 may be one or three or more. By providing a plurality of light emitters 53, it is possible to ensure a sufficient amount of light and a sufficient light irradiation range.

[0264] The optical member 203 is arranged so as to cover the front sides of the plurality of light emitters 53. At least a portion of the optical member 203 is arranged forward of the light unit 201. The optical member 203 is continuous so as to straddle the plurality of light emitters 53. The light transmitting portion 203B of the optical member 203 faces the plurality of light emitters 53. The light transmitting portion 203B covers two light emitters 53 together.

[0265] A portion of the optical member 203 is covered from below by the light cover 204. The portion of the optical member 203 that covers the multiple light emitters 53 is exposed and not covered by the light cover 204. That is, the light transmitting portion 203B that covers the multiple light emitters 53 is exposed downward through the opening 205A of the light cover 204. Light from the multiple light emitters 53 passes through the light transmitting portion 203B and passes through the opening 205A of the light cover 204, and is emitted downward from the hammer case 4.

[0266] 32 and 33, the optical member 203 covers the light emitters 53 and the substrate 202 and is formed in the shape of a case with an open top. The optical member 203 has a sidewall portion 203A, a light-transmitting portion 203B, and a convex portion 203C.

[0267] The side wall portion 203A has a rectangular cylindrical shape. The substrate 202, on which multiple light emitters 53 are mounted, is disposed inside the side wall portion 203A. The side wall portion 203A surrounds the multiple light emitters 53 and the substrate 202 all around (in both the front-rear and left-right directions). The upper surface of the side wall portion 203A is an open opening. The light transmitting portion 203B closes the lower surface of the side wall portion 203A. The light transmitting portion 203B forms the lower surface of the optical member 203. The side wall portion 203A and the light transmitting portion 203B form the optical member 203, which is roughly a rectangular parallelepiped with an open upper surface. The light transmitting portion 203B has a rectangular shape (rounded rectangle) when viewed from below. The light transmitting portion 203B faces the lower surface of the substrate 202. The light transmitting portion 203B faces the light emitters 53 in the up-down direction. Light emitted from the light emitter 53 passes through the light transmitting portion 203B. The lower surface of the light transmitting portion 203B forms the light exit surface of the light unit 201. The light transmitting portion 203B protrudes downward further than the lower end of the side wall portion 203A. When viewed from below, the light transmitting portion 203B is formed in a rectangular shape that is slightly smaller than the outer shape of the side wall portion 203A. Therefore, a stepped shoulder portion 203D (see FIG. 33) is formed at the boundary between the lower end of the side wall portion 203A and the outer periphery of the light transmitting portion 203B.

[0268] The protrusion 203C is provided to protrude laterally from the side wall 203A. In the seventh embodiment, the protrusion 203C protrudes leftward from the left side surface of the side wall 203A. The protrusion 203C is disposed inside the guide groove 214A of the hammer case 4, and functions as a positioning portion for the light unit 201 relative to the hammer case 4.

[0269] As shown in FIG. 33, the upper surface of the substrate 202 is disposed below the upper end of the side wall portion 203A. The substrate 202 and the plurality of light emitters 53 are disposed in a concave accommodation space defined by the side wall portion 203A and the light transmitting portion 203B of the optical member 203. A molded resin 58 is filled into the accommodation space. The molded resin 58 fixes the plurality of light emitters 53 and the substrate 202 to the optical member 203 and to some of the lead wires 65. Note that the molded resin 58 does not necessarily have to be provided.

[0270] The hammer case 4 holds a light unit 201. The light unit 201, which includes a plurality of light emitters 53, is held on the underside of the hammer case 4. The impact tool 1B includes a light cover 204 that is disposed on the underside of the hammer case 4, holds the light emitters 53, and covers the lead wires 65.

[0271] The light cover 204 is separate from the motor housing portion 21. The light cover 204 is separate from the hammer case 4. The light cover 204 engages with the motor housing portion 21. The light cover 204 is attached to the underside of the hammer case 4. The light cover 204 holds the light unit 201 on the underside of the hammer case 4. The light unit 201 is held between the underside of the hammer case 4 and the light cover 204.

[0272] The light cover 204 is a single member in which a light emitter holding portion 205 and a cover portion 206 are integrally formed.

[0273] The light emitter holding portion 205 is disposed on the underside of the hammer case 4 and holds a plurality of light emitters 53. The light emitter holding portion 205 is disposed on the underside of the hammer case 4 at a position adjacent to the rear side of the cylindrical portion 82. The light emitter holding portion 205 covers the periphery of the installation position of the light unit 201. An opening 205A is formed in the light emitter holding portion 205 to expose the light transmitting portion 203B of the optical member 203. The opening 205A penetrates from the bottom surface to the top surface of the light emitter holding portion 205. The light transmitting portion 203B is disposed inside the opening 205A. The opening 205A is formed to have substantially the same planar shape as the light transmitting portion 203B, allowing for dimensional tolerances. The peripheral edge of the opening 205A contacts the shoulder portion 203D of the optical member 203. 33, the light emitter holding part 205 supports the shoulder part 203D (the lower end part of the side wall part 203A) of the optical member 203 from below at the peripheral part of the opening part 205A. In this way, the light emitter holding part 205 supports the shoulder part 203D of the optical member 203, and thereby supports the entire light unit 201 including the light emitter 53 from below.

[0274] As shown in Figures 31 and 32, the light emitter holding portion 205 is fixed to the underside of the hammer case 4 by screws 60S, which tighten the light emitter holding portion 205 toward the underside of the hammer case 4. The light emitter holding portion 205 holds the multiple light emitters 53 by pressing the underside (shoulder portion 203D) of the optical member 203 toward the hammer case 4 with the peripheral portion of the opening 205A. The light emitter holding portion 205 presses the outer peripheral edge of the underside of the optical member 203. The light emitter holding portion 205 may simply support the optical member 203 from below without pressing it.

[0275] As shown in FIG. 32 , the light emitter holding portion 205 is fixed at multiple locations around the optical member 203 with screws 60S. Specifically, the light emitter holding portion 205 is fixed with two screws 60S at two locations on both left and right sides of the light unit 201. Screw holes 211A are formed in a flat mounting surface 211 of the underside of the hammer case 4. In the seventh embodiment, the mounting surface 211 is the bottom surface of the groove portion 212. The two screw holes 211A are arranged on both left and right sides of the light source arrangement portion 213 in which the light unit 201 is arranged. The light emitter holding portion 205 is formed with insertion holes 205B into which the screws 60S are attached. The screws 60S pass through the insertion holes 205B of the light emitter holding portion 205 from below and are fixed into the screw holes 211A.

[0276] The cover portion 206 covers the lead wires 65. The lead wires 65 extend from the light unit 201 to the motor housing portion 21 along the underside of the hammer case 4. In other words, the lead wires 65 extend from the lower opening 21D on the front surface of the motor housing portion 21 to the underside of the hammer case 4. The lead wires 65 extend forward along the underside of the hammer case 4 and connect to the board 202 of the light unit 201. The lead wires 65 connect to the multiple light emitters 53 on the board 202 to supply power.

[0277] 34 is a bottom view showing the front part of the impact tool 1B according to the seventh embodiment with the light cover 204 removed. As shown in FIG. 34, in the seventh embodiment, the lead wire 65 is not provided with connectors (connectors 66A and 66B) and is directly connected to the substrate 202 of the light unit 201.

[0278] 32 and 34, the hammer case 4 has a groove 212 in which the lead wire 65 is disposed on the underside of the hammer case 4. The groove 212 is a recessed portion that is recessed upward from the underside of the hammer case 4. The groove 212 is provided on the underside of the hammer case 4 along the front-to-rear direction in a range from the rear end of the cylindrical portion 82 to the rear end of the hammer case 4. The lead wire 65 is disposed in the groove 212.

[0279] In the seventh embodiment, the hammer case 4 has a light source arrangement portion 213 in which a plurality of light emitters 53 are arranged on the underside of the hammer case 4. The light source arrangement portion 213 is arranged on the underside of the hammer case 4, rearward of the rear end portion of the cylindrical portion 82. The light source arrangement portion 213 is arranged at a predetermined position inside the groove portion 212.

[0280] Specifically, a guide wall 214 rising downward from the mounting surface 211 is formed on the mounting surface 211, which is the bottom surface of the groove portion 212. The guide wall 214 defines the positions of the light source mounting portion 213 and the lead wires 65 inside the groove portion 212. Two screw holes 211A are formed inside the groove portion 212 and outside the guide wall 214. The guide wall 214 is formed to surround the periphery (front and left / right directions) of the light source mounting portion 213. The light unit 201 and the optical member 203 are disposed in the light source mounting portion 213 surrounded by the guide wall 214. A guide groove 214A is formed in a part of the guide wall 214 surrounding the light source mounting portion 213. The guide groove 214A is a recessed groove formed by partially cutting out the guide wall 214, and is formed in the guide wall 214 on the left side of the light source mounting portion 213. The convex portion 203C of the optical member 203 is disposed in this guide groove 214A, thereby determining the position of the light unit 201 in the in-plane directions (front-rear and left-right directions).

[0281] The guide wall 214 opens the rear side of the light source mounting portion 213. The guide walls 214 extend rearward from both the left and right sides of the light source mounting portion 213. A lead wire 65 is arranged in the area between the left and right guide walls 214. Furthermore, a ground wire 67 connected to the ground terminal 84B is arranged in the area between the left and right guide walls 214. The lead wire 65 and the ground wire 67 are arranged inside the same groove portion 212 and in the area between the left and right guide walls 214.

[0282] The guide wall 214 forms a narrow passage portion 84A at its rear end. The passage portion 84A extends to the rear surface of the hammer case 4. The lead wires 65 and the ground wire 67 extending from the lower opening 21D (see FIG. 32) of the motor housing portion 21 pass through the passage portion 84A.

[0283] 32, the cover portion 206 covers the lead wires 65 and the ground wire 67. The cover portion 206 extends rearward from the rear end portion of the light emitter holding portion 205. The cover portion 206 extends to the front surface of the motor housing portion 21.

[0284] The cover portion 206 has a claw portion 62A that engages with the motor housing portion 21. The claw portion 62A protrudes rearward from the rear end portion of the cover portion 206. The claw portion 62A engages with the motor housing portion 21 by being inserted into the lower opening 21D of the motor housing portion 21. Due to the engagement between the motor housing portion 21 and the claw portion 62A, the rear end portion of the cover portion 206 can move in the front-to-rear direction but cannot move downward. The cover portion 206 is fixed to the hammer case 4 with the claw portion 62A engaged with the motor housing portion 21. The cover portion 206 covers the entire lower opening 21D of the motor housing portion 21.

[0285] The light cover 204, which includes the light emitter holding portion 205 and the cover portion 206, covers the lower surface of the hammer case 4 on the rear side of the cylindrical portion 82. The light cover 204 fits inside the groove portion 212 to cover the groove portion 212. The light cover 204 covers the portion of the optical member 203 other than the light transmitting portion 203B while exposing the light transmitting portion 203B.

[0286] When assembling the impact tool 1B, an assembler places the light unit 201 and the optical member 203 in the light source placement portion 213, arranges the lead wires 65 and the ground wiring 67 so that they fit in the area between the guide walls 214, and then attaches the light cover 204 to the hammer case 4. The light cover 204 is fixed to the hammer case 4 by two screws 60S that pass through the insertion holes 205B, with the claw portions 62A inserted and engaged in the lower opening 21D of the motor housing portion 21. When the light cover 204 is fixed to the hammer case 4, the light unit 201, positioned by the guide grooves 214A, is placed in the opening 205A of the light cover 204. The optical member 203 is held between the light cover 204 and the lower surface of the hammer case 4 by the peripheral portion of the opening 205A.

[0287] Fig. 35 is a vertical cross-sectional view showing the front part of an impact tool 1B according to the seventh embodiment. Next, with reference to Fig. 35, the arrangement position of the light emitter 53 according to the seventh embodiment will be described.

[0288] In the seventh embodiment, the light emitter 53 is held on the lower surface of the portion of the hammer case 4 that houses the reduction mechanism section 7.

[0289] The reduction mechanism 7 is housed in the hammer case 4 and transmits the rotational force of the motor 6 to the spindle 8. The reduction mechanism 7 is connected to the bevel gear 35, which is the pinion gear of the motor 6, and to the spindle gear 8C of the spindle 8. The reduction mechanism 7 is disposed between the spindle 8 and a bearing 38F, which rotatably holds the bevel gear 35, in the front-rear direction. The reduction mechanism 7 is disposed behind the spindle 8 and connected to the spindle 8 from behind. The reduction mechanism 7 includes a first reduction unit 41 connected to the bevel gear 35 (pinion gear) and a second reduction unit 42 connected to the first reduction unit 41 and the spindle gear 8C. The first reduction unit 41 and the second reduction unit 42 are aligned in the front-rear direction. The second reduction unit 42 is disposed in front of the first reduction unit 41.

[0290] The multiple light emitters 53, i.e., the light unit 201, are arranged on the underside of the hammer case 4 at positions that overlap the speed reduction mechanism 7 in the vertical direction. More specifically, the multiple light emitters 53 overlap the second reduction unit 42 of the speed reduction mechanism 7 in the vertical direction. The multiple light emitters 53 are arranged on the underside of a portion of the hammer case 4 that houses the second intermediate gear 42A and the second intermediate shaft 42B that constitute the second reduction mechanism 42. The multiple light emitters 53 are arranged on the underside of the end of the portion that houses the speed reduction mechanism 7, on the spindle 8 side.

[0291] 35, the housing space of the hammer case 4 can be understood as being divided into a plurality of sections. That is, the hammer case 4 includes a first section 221 that houses the spindle 8 and the hammer 47, and a second section 222 that is continuous with the rear of the first section 221. In the seventh embodiment, the light emitter 53 is held on the underside of the second section 222 of the hammer case 4.

[0292] In detail, the first part 221 of the hammer case 4 houses a striking mechanism 9 including a spindle 8 and a hammer 47, and an anvil 10 is arranged so as to protrude downward from the lower surface (cylindrical part 82) of the first part 221.

[0293] The second section 222 of the hammer case 4 houses the reduction mechanism section 7. The first section 221 and the second section 222 are separated by a first partition wall 224. The second intermediate gear 42A of the second reduction section 42 passes above the first partition wall 224 and meshes with the spindle gear 8C. The first partition wall 224 defines the front end of the accommodation space for the reduction mechanism section 7.

[0294] In the example of FIG. 35 , the hammer case 4 includes a third portion 223 that follows the second portion 222. The third portion 223 has an accommodating recess 85 that accommodates the bearing 38F. The second portion 222 and the third portion 223 are separated from each other by a second partition wall 225 that has a hole 88 formed therein. The driven gear 41A of the first reduction gear unit 41 meshes with the bevel gear 35 that has passed through the hole 88. The second partition wall 225 defines the rear end of the accommodating space for the reduction gear mechanism 7.

[0295] The plurality of light emitters 53, i.e., the light unit 201, are disposed on the underside of the second portion 222 between the first portion 221 and the third portion 223. With respect to their positions in the front-to-rear direction, the plurality of light emitters 53 are disposed either vertically overlapping the first partition 224 or at a position rearward of the first partition 224. The plurality of light emitters 53 are disposed either vertically overlapping the second partition 225 or at a position forward of the second partition 225. The plurality of light emitters 53 are disposed on the first portion 221 side of the second portion 222, i.e., on the side closer to the anvil 10. Therefore, the plurality of light emitters 53 are disposed at a position rearward of the spindle 8 and the striking mechanism 9 and close to the anvil 10. In the case of an impact wrench, a socket is attached to the tip tool holder 51 of the anvil 10 as a tip tool, and the outer diameter of the socket may be large depending on the size of the bolt or the like to be fastened. In the seventh embodiment, the light unit 201 is positioned near the anvil 10 but at a moderate distance, so that even when a large tool tip is attached, a shadow is less likely to be formed due to the light from the light unit 201 being blocked by the tool tip.

[0296] (effect) As described above, in the seventh embodiment, the impact tool 1B is housed in the hammer case 4 and includes the speed reduction mechanism 7 that transmits the rotational force of the motor 6 to the spindle 8. The light emitter 53 is held on the underside of the part of the hammer case 4 that houses the speed reduction mechanism 7.

[0297] In the above configuration, the light emitter 53 can be held in a position near but not directly below the rotation mechanism including the spindle 8, hammer 47, and anvil 10. Therefore, even if a large tool bit is attached to the tool bit holder 51 at the bottom end of the anvil 10, the light emitter 53 is unlikely to be blocked by the tool bit, and the light emitter 53 can be placed in a position where it can properly illuminate the area where the tool bit is to be used.

[0298] In the seventh embodiment, the hammer case 4 includes a first portion 221 that houses the spindle 8 and the hammer 47, and a second portion 222 that is continuous with the rear portion of the first portion 221. The light emitter 53 is held on the lower surface of the second portion 222 of the hammer case 4.

[0299] In the above configuration, the light emitter 53 can be held in the immediate vicinity of the anvil 10 in the second part 222 subsequent to the first part 221 that houses the spindle 8 and the hammer 47. Therefore, even if a large tool bit is attached to the tool bit holder at the bottom end of the anvil 10, the light emitter 53 is unlikely to be blocked by the tool bit, and the light emitter 53 can be placed in a position where it can properly illuminate the area where the tool bit is to be used. [Explanation of symbols]

[0300] 1...Impact tool, 1A...Impact tool, 1B...Impact tool, 2...Housing, 2S...Screw, 4...Hammer case, 4A...Case body, 4B...Lid, 4F...Case flange, 4H...Boss, 4S...Screw, 6...Motor, 7...Reduction mechanism, 8...Spindle, 8A...Flange, 8B...Spindle shaft, 8C...Spindle gear, 8D...Cylindrical part, 8F...Spindle groove, 9...Impact mechanism, 10...Anvil, 10A...Anvil shaft, 10B...Anvil protrusion, 10C...Anvil recess, 12...Fan, 13...Battery mounting part, 14...Trigger lever, 14 A...Switch body, 15...Forward / reverse switching lever, 16...Operation panel, 16A...Operation button, 16B...Indicator display, 16C...Circuit board, 16D...Bracket, 17...Light unit, 18...Controller, 19...Intake port, 20...Exhaust port, 21...Motor housing part, 21A...Rear holding part, 21B...Panel opening, 21C...Holding groove, 21D...Lower opening, 21E...Annular rib, 21F...Housing flange part, 21G...Support wall, 21H...Screw insertion hole, 21J...Protrusion part, 22...Grip part, 23...Battery holding part, 25...Battery pack, 25A...Engagement hook, 2 6... stator, 27... rotor, 28... stator core, 29... front insulator, 30... rear insulator, 31... coil, 32... rotor core portion, 33... rotor shaft portion, 34... rotor magnet, 35... bevel gear, 37... sensor board, 38F... bearing, 38R... bearing, 41... first reduction gear portion, 41A... driven gear, 41B... first intermediate gear, 41C... first intermediate shaft, 41D... intermediate bearing, 42... second reduction gear portion, 42A... second intermediate gear, 42B... second intermediate shaft, 42C... intermediate bearing, 44... spindle bearing, 45... washer, 46... anvil bearing 46A...groove, 46B...sealing member, 47...hammer, 47A...hammer groove, 47B...hammer protrusion, 47C...recess, 47D...body portion, 48...ball, 49...coil spring, 50...ball, 51...tipped tool holding portion, 52...washer, 53...illuminant, 54...substrate, 55...bank, 56...fluorescent material, 57...optical member, 57A...outer cylinder portion, 57B...inner cylinder portion, 57C...light transmitting portion, 57D...convex portion, 58...molded resin, 59...buffer member, 60...light cover, 60S...screw, 61...illuminant holding portion, 61A...circumferential wall portion, 61B...engaging portion, 61H...boss portion, 62...cover portion,62A...claw portion, 63...cover recess, 65...lead wire, 65A...first lead wire, 65B...second lead wire, 66...connector, 66A...connector, 66B...connector, 67...earth wiring, 70...screw, 71...inner ring, 72...outer ring, 73...ball, 81...mounting surface, 81A...screw hole, 82...cylindrical portion, 83...guide protrusion, 84...groove portion, 84A...passage portion, 84B...ground terminal, 85...accommodating recess, 85A...radial support surface, 85B...front support surface, 85C...O-ring , 85D...groove, 86...outer cylindrical portion, 87...inner cylindrical portion, 88...hole portion, 89...engagement hole, 91...intermediate support member, 91A...intermediate support member, 91B...intermediate support member, 91C...intermediate support member, 91D...intermediate support member, 91E...intermediate support member, 92...central opening, 93...recess, 94...rear support surface, 101...outer peripheral portion, 102...inner peripheral portion, 103...outer peripheral mounting portion, 104...inner peripheral mounting portion, 111...shaft, 112...spur gear, 113F...rotor bearing, 114...driven gear, 115A...first intermediate gear, 115B...second intermediate gear, 115C...intermediate shaft, 116...intermediate bearing, 118...accommodating recess, 118A...radial support surface, 118B...front support surface, 119...front accommodating section, 120...rear accommodating section, 121...first accommodating chamber, 122...second accommodating chamber, 135...bevel gear, 139...bearing, 201...light unit, 202...substrate, 203...optical member, 203A...side wall portion, 203B...light transmitting portion, 203C...convex portion, 203D... Shoulder portion, 204...light cover, 205...light emitter holding portion, 205A...opening, 205B...insertion hole, 206...cover portion, 211...mounting surface, 211A...screw hole, 212...groove portion, 213...light source arrangement portion, 214...guide wall, 214A...guide groove, 221...first portion, 222...second portion, 223...third portion, 224...first partition wall, 225...second partition wall, CL...gap, D1...inner diameter, D2...inner diameter, D3...depth, D4...thickness, FM...fixing member, W1...width, W2...width.

Claims

1. a grip portion extending in the front-rear direction; a motor housing portion disposed in front of the grip portion; a motor disposed inside the motor housing portion; a spindle disposed in front of the motor, extending in a direction intersecting the front-rear direction, and rotated by the motor; a hammer rotated by the spindle; an anvil that is struck in a rotational direction by the hammer; a tool holder disposed at a lower end of the anvil; a hammer case that houses the spindle and the hammer; a light emitter held in the hammer case, Impact tool.

2. The spindle extends downward along a rotation axis perpendicular to the front-rear direction. The impact tool according to claim 1 .

3. The light emitter is held on the lower surface of the hammer case. The impact tool according to claim 1 .

4. Further, a buffer member is provided between the light emitter and the lower surface of the hammer case. The impact tool according to claim 3.

5. A plurality of the light-emitting bodies are provided around the anvil and are arranged along the circumferential direction of the anvil. The impact tool according to claim 1 .

6. a speed reduction mechanism that is housed in the hammer case and transmits the rotational force of the motor to the spindle; The light emitter is held on the lower surface of the housing portion of the hammer case for accommodating the reduction mechanism. The impact tool according to claim 1 .

7. the hammer case includes a first portion that houses the spindle and the hammer, and a second portion that is continuous with a rear portion of the first portion, The light emitter is held on the lower surface of the second portion of the hammer case. The impact tool according to claim 1 .

8. a lead wire connected to the light emitter and extending along the lower surface of the hammer case to the motor housing portion; a light cover that is disposed on the underside of the hammer case, holds the light emitter, and covers the lead wires. An impact tool according to any one of claims 1 to 7.

9. a grip portion extending in the front-rear direction; a motor housing portion disposed in front of the grip portion; a motor disposed inside the motor housing portion; a spindle rotated by the motor; a hammer that moves relative to the spindle; an anvil that is struck directly or indirectly by the hammer in a rotational direction; a tool holder disposed at a lower end of the anvil; a plurality of light emitters disposed around the anvil; a hammer case that houses the spindle and the hammer; a light-emitting element holder that is separate from the motor housing, is disposed on a lower surface of the hammer case, and holds the plurality of light-emitting elements; Impact tool.

10. The lower surface of the hammer case has a flat mounting surface and a cylindrical portion that protrudes downward from the mounting surface and through which the anvil passes, the light-emitting body and the light-emitting body holder are disposed on the placement surface; 10. The impact tool according to claim 9.

11. an optical member disposed to cover the plurality of light emitters and diffusing light from the plurality of light emitters; the light-emitting body holding portion holds the plurality of light-emitting bodies by pressing a lower surface of the optical member toward the hammer case. An impact tool according to claim 9 or 10.

12. The light emitter holder is fixed to the lower surface of the hammer case by a screw.

12. An impact tool according to claim 11.

13. the plurality of light emitters are arranged along the circumferential direction of the anvil, the optical member is formed in a ring shape surrounding the anvil so as to cover the plurality of light emitters, the light-emitting body holder has a peripheral wall portion surrounding the periphery of the optical member, the peripheral wall portion has a boss portion to which a screw is attached, The light emitting body holding portion is fixed to the lower surface of the hammer case by screws at a plurality of locations around the optical member.

13. An impact tool according to claim 12.

14. a grip portion extending in the front-rear direction; a motor housing portion disposed in front of the grip portion; a motor disposed inside the motor housing portion; a spindle rotated by the motor; a hammer that moves relative to the spindle; an anvil that is struck directly or indirectly by the hammer in a rotational direction; a tool holder disposed at a lower end of the anvil; a plurality of light emitters disposed around the anvil; a hammer case that houses the spindle and the hammer; lead wires extending from the motor housing portion and connected to the plurality of light emitters; a cover portion that is separate from the motor housing portion, is disposed on the underside of the hammer case, and covers the lead wires. Impact tool.

15. the lead wires include a first lead wire extending from the motor housing portion, and a second lead wire connected to the first lead wire via a connector and connected to the plurality of light emitters; the cover portion covers the connector, the first lead wire, and the second lead wire.

15. An impact tool according to claim 14.

16. a ground wire extending from the motor housing portion and connected to a lower surface of the hammer case; The cover portion covers the lead wire and the ground wire.

16. An impact tool according to claim 15.

17. the hammer case has a groove in a lower surface of the hammer case in which the lead wire is disposed, The cover covers the groove in which the lead wire is disposed. An impact tool according to any one of claims 14 to 16.

18. The cover portion extends from the arrangement position of the plurality of light emitters to the motor housing portion on the underside of the hammer case. An impact tool according to any one of claims 14 to 16.

19. The cover portion has a claw portion that engages with the motor housing portion, and is fixed to the hammer case with the claw portion engaged with the motor housing portion.

19. An impact tool according to claim 18.

20. a grip portion extending in the front-rear direction; a motor housing portion disposed in front of the grip portion; a motor disposed inside the motor housing portion; a spindle rotated by the motor and disposed in front of the motor; a hammer rotated by the spindle; an anvil that is struck in a rotational direction by the hammer; a quadrangular prism-shaped tool bit holder disposed at a lower end of the anvil; a hammer case that houses the spindle and the hammer; and one or more light emitters held in the hammer case. Impact wrench.

Images