Impact tool

Abstract

To provide an impact tool which appropriately performs lighting of a peripheral area of an anvil.SOLUTION: An impact tool comprises: a motor; a motor storage part which stores the motor; a grip part which extends from the motor storage part to below; a hammer which is rotated by the motor; an anvil which is impacted in a rotation direction by the hammer; a hammer storage part which stores the hammer; a pole part which is arranged in front of the grip part and extends to a position below the motor storage part or the hammer storage part; a battery holding part which is connected with the grip part and the pole part and in which a battery pack is attached thereto and detached therefrom; and an emitter unit which is held at the front part of the hammer storage part and includes a plurality of emitters around the anvil in the rotation direction. A lead wire passes through inside of the pole part to be electrically connected with the emitter unit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to impact tools.

Background Art

[0002] In impact tools having a support column, there was only a single light. Since this impact tool was large, the light did not properly illuminate the area around the anvil. In impact tools having a support column and a side handle, there was only a single light. Since this impact tool was large, the light did not properly illuminate the area around the anvil. Furthermore, although there were impact tools having a side handle and multiple lights, the balance was poor because the handle was behind the motor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The technology disclosed in this specification aims to properly illuminate the area around the anvil in an impact tool having a support column. Also, the technology disclosed in this specification aims to ensure good balance in an impact tool having a side handle.

Means for Solving the Problems

[0005] This specification discloses an impact tool. The impact tool may include a motor, a motor housing that houses the motor, a grip portion that extends downward from the motor housing, a hammer that is rotated by the motor, an anvil that is struck in a rotational direction by the hammer, a hammer housing that houses the hammer, a support portion that is disposed in front of the grip portion and extends downward from the motor housing or the hammer housing, a battery holding portion that is connected to the grip portion and the support portion and to which a battery pack is detachable, and a light emitter unit that is held at the front portion of the hammer housing and has a plurality of light emitters in the rotational direction around the anvil. A lead wire that is electrically connected to the light emitter unit may pass through the inside of the support portion.

Advantages of the Invention

[0006] According to the above configuration, appropriate illumination can be provided around the anvil.

Brief Description of the Drawings

[0007]

Figure 1

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DETAILED DESCRIPTION OF THE INVENTION

[0008] In one or more embodiments, the impact tool may include a motor, a motor housing that houses the motor, a grip portion that extends downward from the motor housing, a hammer that is rotated by the motor, an anvil that is struck in a rotational direction by the hammer, a hammer housing that houses the hammer, a support portion that is disposed in front of the grip portion and extends downward from the motor housing or the hammer housing, a battery holder that is connected to the grip portion and the support portion and to which a battery pack is detachable, and a light emitter unit that is held at the front portion of the hammer housing and has a plurality of light emitters in the rotational direction around the anvil. A lead wire electrically connected to the light emitter unit may pass through the inside of the support portion.

[0009] In the above configuration, in the impact tool having the support portion, since the light emitter unit having a plurality of light emitters in the rotational direction around the anvil is held at the front portion of the hammer housing, appropriate illumination around the anvil can be performed. Further, since the support portion is used as a passage for the lead wire, it is not necessary to increase the size of the structure of the impact tool in order to allow the lead wire to pass through. Therefore, an increase in the size of the impact tool due to the wiring for illumination is suppressed.

[0010] In one or more embodiments, the hammer housing may have a front surface portion provided with the light emitter unit. The support portion may be provided so as to extend downward from the front surface portion of the hammer housing.

[0011] In the above configuration, the light emitter unit and the support portion can be brought closer together. Since the portion for guiding the lead wire between the light emitter unit and the support portion can be made smaller or the portion for guiding the lead wire can be omitted, an increase in the size of the impact tool due to the wiring for illumination is suppressed. Also, even when the hammer housing becomes large in a large impact tool, the impact resistance can be effectively improved by disposing the support portion below the front surface portion of the hammer housing.

[0012] In one or more embodiments, the hammer housing may have a wall portion surrounding the outer periphery of the light emitter unit.

[0013] In the above configuration, the light-emitting unit can be protected from external impacts by the wall portion.

[0014] In one or more embodiments, the wall portion may be at the same position as the front surface of the light-emitting unit or may extend forward beyond the front surface of the light-emitting unit.

[0015] In the above configuration, since the light-emitting unit does not protrude forward beyond the wall portion, the light-emitting unit can be effectively protected.

[0016] In one or more embodiments, the light-emitting unit may be formed in a circumferential shape so as to surround the anvil. Note that the circumferential shape means along the circumferential direction and is not limited to surrounding the entire circumference of the anvil, and may only surround a part of the periphery of the anvil.

[0017] In the above configuration, light can be irradiated by the light-emitting unit from a wide range around the anvil. Illumination of the tip tool attached to the anvil and the working location can be effectively performed.

[0018] In one or more embodiments, the hammer housing portion may have a front cylinder portion in which an anvil bearing for supporting the anvil in the rotational direction is disposed. At least a part of the light-emitting unit may be disposed between the outer peripheral surface of the hammer housing portion and the front cylinder portion.

[0019] In the above configuration, the space between the outer peripheral surface of the hammer housing portion and the front cylinder portion can be used as the installation space for the light-emitting unit. Therefore, the increase in size of the impact tool is suppressed.

[0020] In one or more embodiments, the support portion may be disposed directly below the light-emitting unit. The light-emitting unit may have a convex portion that enters the inside of the support portion.

[0021] In the above configuration, since the convex portion of the light-emitting unit is disposed inside the support column portion, the lead wire extending from the light-emitting unit can directly enter the inside of the support column portion. Since there is no need to separately provide a member for guiding between the light-emitting unit and the support column portion, enlargement of the impact tool can be suppressed.

[0022] In one or more embodiments, the battery holding portion may have a controller for controlling the light-emitting unit. The lead wire may pass from the upper end portion to the lower end portion of the support column portion and be connected to the controller.

[0023] In the above configuration, even when the light-emitting unit is disposed in the hammer housing portion, by using the entire support column portion as a passage for the lead wire, the structure for wiring can be simplified and the number of parts can be reduced.

[0024] In one or more embodiments, the light-emitting unit may be disposed so as to cover the front side of a plurality of light emitters, and may include an optical member for diffusing the light of the plurality of light emitters. The optical member may be continuous so as to straddle the plurality of light emitters.

[0025] In the above configuration, the optical member can cause the light-emitting unit to emit light in a planar shape rather than a point shape. Since the variation in brightness and darkness in the light emission direction is reduced, illumination of the periphery of the anvil can be performed more appropriately.

[0026] In one or more embodiments, the impact tool may further include a connection portion that connects the upper end of the grip portion and the upper end of the support column portion. The grip portion, the support column portion, the battery holding portion, and the connection portion may form an annular handle portion.

[0027] In the above configuration, the annular handle portion causes the grip portion, the support column portion, the battery holding portion, and the connection portion to support each other, so that the impact resistance of the handle portion can be effectively improved.

[0028] In one or more embodiments, the impact tool may include a motor, a motor housing that houses the motor, a grip portion that extends downward from the motor housing, a hammer that is rotated by the motor, an anvil that is struck in a rotational direction by the hammer, a hammer housing that houses the hammer, a support portion that is disposed in front of the grip portion and extends downward from the motor housing or the hammer housing, a battery holder that is connected to the grip portion and the support portion and to which a battery pack is detachable, a side handle that is detachable from the hammer housing, and a light-emitting unit that is disposed in front of the side handle.

[0029] In the above configuration, since the side handle is detachable from the hammer housing that houses the hammer, the side handle can be brought closer to the heavy components (the hammer and the hammer housing). Therefore, good balance can be ensured in the impact tool having the side handle. And since the light-emitting unit is disposed in front of the side handle, even when the side handle is attached to the hammer housing, the light from the light-emitting unit can reach the periphery of the anvil without being obstructed by the side handle. Therefore, appropriate illumination of the periphery of the anvil can be performed.

[0030] In one or more embodiments, the hammer housing may have an annular and concave installation portion that houses the light-emitting unit.

[0031] In the above configuration, the annular light-emitting unit can be compactly installed in the hammer housing. Therefore, an increase in the size of the impact tool can be suppressed.

[0032] In one or more embodiments, the impact tool may further include a buffer member disposed between the hammer housing and the light-emitting unit. The buffer member may cover the rear surface of the light-emitting unit and at least one of the inner peripheral surface and the outer peripheral surface of the light-emitting unit.

[0033] In the above configuration, even when the light emitter unit is installed in the hammer housing portion that vibrates due to impact during the use of the impact tool, the buffer member can effectively protect the light emitter unit from vibration.

[0034] In one or more embodiments, the light emitter unit may be held by the buffer member in the installation portion in a non-contact state with the hammer housing portion via the buffer member.

[0035] In the above configuration, since the light emitter unit does not directly contact the hammer housing portion, it is possible to prevent the occurrence of wear and the like of the light emitter unit caused by the vibration of the hammer housing portion.

[0036] In one or more embodiments, the hammer housing portion may have a wall portion that constitutes the outer periphery of the installation portion. The wall portion may connect the light emitter unit and the inside of the support portion and may have a slit through which the lead wire passes.

[0037] In the above configuration, the wall portion can protect the light emitter unit from external collisions. The slit in the wall portion allows the lead wire to easily enter from the light emitter unit into the inside of the support portion.

[0038] In one or more embodiments, the impact tool may further include a guide portion that guides the lead wire passing through the slit so as not to contact the hammer housing portion.

[0039] In the above configuration, the guide portion can protect the lead wire from the vibration generated in the hammer housing portion.

[0040] In one or more embodiments, the light emitter unit may have a convex portion that enters the inside of the support portion through the slit. The impact tool may further include a buffer member disposed between the hammer housing portion and the light emitter unit. The guide portion may be constituted by a passage portion surrounded by the buffer member and the convex portion inside the slit.

[0041] In the above configuration, the light emitter unit can be effectively protected from vibration by the buffer member. A guide portion can be configured using a part (convex portion) of the light emitter unit and the buffer member. Therefore, the number of components can be reduced compared to the case where a guide portion is provided separately from the buffer member.

[0042] In one or more embodiments, the impact tool may further include an annular first protective cover that covers a wall portion including a slit, an end portion of the support portion adjacent to the slit, and an outer peripheral portion of the front surface of the light emitter unit.

[0043] In the above configuration, the first protective cover can mitigate the impact during a collision with an external object when using the impact tool.

[0044] In one or more embodiments, the hammer housing portion may form an inner peripheral surface of the installation portion and have a front cylinder portion that surrounds the anvil. The impact tool may further include an annular second protective cover that covers the front cylinder portion and an inner peripheral portion of the front surface of the light emitter unit.

[0045] In the above configuration, the second protective cover can mitigate the impact during a collision with an external object when using the impact tool. By covering the outer peripheral portion and the inner peripheral portion of the front surface of the light emitter unit with the first protective cover and the second protective cover, the light emitter unit can be effectively protected while ensuring the light emission region of the light emitter unit.

[0046] In one or more embodiments, the impact tool may include a motor, a motor housing portion that houses the motor, a hammer that is rotated by the motor, an anvil that is struck in the rotational direction by the hammer, a hammer housing portion that houses the hammer, an annular light emitter unit that is disposed in the front portion of the hammer housing portion and surrounds the anvil, and an annular handle portion that is disposed below the motor housing portion and the hammer housing portion.

[0047] In the above configuration, a part of the annular handle portion can function as a grip portion, and another part can function as a support portion. Since the annular light emitter unit surrounding the anvil is disposed at the front portion of the hammer housing portion, appropriate illumination can be provided around the anvil. As a result, appropriate illumination can be provided around the anvil in the impact tool having the support portion.

[0048] Hereinafter, embodiments will be described with reference to the drawings. In the embodiments, the terms left, right, front, rear, top, and bottom are used to describe the positional relationship of each part. These terms indicate the relative position or direction with respect to the center of the impact tool.

[0049] FIG. 1 is a front perspective view showing an impact tool 1 according to an embodiment. FIG. 2 is a rear perspective view showing the impact tool 1 according to the embodiment. FIG. 3 is a side view showing the impact tool 1 according to the embodiment from the right side. FIG. 4 is a longitudinal sectional view showing the impact tool 1 according to the embodiment. FIG. 5 is an exploded perspective view showing a housing 2 according to the embodiment. FIG. 6 is a longitudinal sectional view showing the upper portion of the impact tool 1 according to the embodiment.

[0050] In the embodiment, the impact tool 1 is an electric tool having an electric motor 6 as a power source. A direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as an axial direction, a direction around the rotation axis AX is appropriately referred to as a circumferential direction or a rotational direction, and a radial direction of the rotation axis AX is appropriately referred to as a radial direction. Further, in the radial direction, a position close to the rotation axis AX or a direction approaching it is appropriately referred to as an inner radial side or an inner circumferential side, and a position far from the rotation axis AX or a direction separating from it is appropriately referred to as an outer radial side or an outer circumferential side. In the embodiment, the rotation axis AX extends in the front-rear direction. One side in the axial direction is the front side (front), and the other side in the axial direction is the rear side (rear).

[0051] In an embodiment, the impact tool 1 is an impact wrench. The impact tool 1 includes a housing 2, a hammer housing portion 3, a screw 5, a motor 6, a speed reduction mechanism 7, a spindle 8, a striking mechanism 9, an anvil 10, a handle portion 11, a fan 12, a trigger lever 14, a forward / reverse switching lever 15, and a light-emitting unit 16.

[0052] The housing 2 is made of synthetic resin. In the embodiment, the housing 2 is made of nylon. The housing 2 includes a left housing 2L and a right housing 2R disposed to the right of the left housing 2L. The left housing 2L and the right housing 2R are fixed by a plurality of screws 2S. The housing 2 is composed of a pair of split housings.

[0053] The housing 2 has a motor housing portion 21 and a handle portion 11. The handle portion 11 includes a grip portion 22, a battery holding portion 23, a support portion 24, and a connection portion 25.

[0054] The motor housing portion 21 is cylindrical. The motor housing portion 21 has a bottomed cylindrical shape with an open front portion and a closed rear portion. The motor housing portion 21 houses the motor 6. The motor housing portion 21 houses the fan 12 and a part of the gear case 38. A screw boss portion 2H is provided on the motor housing portion 21.

[0055] The grip portion 22 extends downward from the motor housing portion 21. The grip portion 22 is provided so as to straddle the motor housing portion 21 and the hammer housing portion 3 in the front-rear direction. The trigger lever 14 is provided on the upper portion of the grip portion 22. The grip portion 22 is gripped by an operator.

[0056] The support portion 24 is disposed in front of the grip portion 22. The support portion 24 is disposed at a position away from the front of the grip portion 22. The space between the grip portion 22 and the support portion 24 serves as a space for placing the fingers that grip the grip portion 22. The support portion 24 extends downward below the motor housing portion 21 or the hammer housing portion 3. In the embodiment, the support portion 24 extends downward below the hammer housing portion 3. Specifically, the support portion 24 is provided so as to extend downward from the front surface portion 3C of the hammer housing portion 3. The support portion 24 is disposed directly below the light emitter unit 16. In the front-rear direction, the position of the light emitter unit 16 and at least a part of the position of the support portion 24 coincide. The support portion 24 may extend downward below the motor housing portion 21. The support portion 24 is hollow. The upper end of the support portion 24 is open. In the embodiment, a lead wire 60 electrically connected to the light emitter unit 16 passes through the inside of the support portion 24. In each figure, for convenience, the lead wire 60 is shown by a dotted line. [[ID=!]]

[0057] The battery holding portion 23 is connected to the grip portion 22 and the support portion 24. The battery holding portion 23 is connected to the lower end portion of the grip portion 22. The battery holding portion 23 is connected to the lower end portion of the support portion 24. In each of the front-rear direction and the left-right direction, the outer dimension of the battery holding portion 23 is larger than the outer dimension of the grip portion 22. The battery holding portion 23 extends forward from directly below the grip portion 22. The battery holding portion 23 is connected to the lower end portion of the support portion 24 at the front end portion. The battery holding portion 23 is detachable for the battery pack 80.

[0058] As shown in FIGS. 4 and 5, the connecting portion 25 is connected to the grip portion 22 and the support portion 24. The connecting portion 25 connects the upper end of the grip portion 22 and the upper end of the support portion 24. The connecting portion 25 extends in the front-rear direction. The connecting portion 25 follows the outer peripheral surface of the hammer housing portion 3.

[0059] The handle portion 11 is disposed below the motor housing portion 21 and the hammer housing portion 3. The handle portion 11 is composed of a grip portion 22, a battery holding portion 23, a support portion 24, and a connection portion 25. The handle portion 11 has an annular shape formed by the grip portion 22, the battery holding portion 23, the support portion 24, and the connection portion 25. The handle portion 11 extends in the vertical direction and the front-rear direction. The grip portion 22 constitutes the rear side of the handle portion 11. The support portion 24 constitutes the front side of the handle portion 11. The battery holding portion 23 constitutes the lower side of the handle portion 11. The connection portion 25 constitutes the upper side of the handle portion 11. As shown in FIG. 3, when viewed from the left-right direction, the handle portion 11 has a substantially D-shaped annular shape. Each part constituting the handle portion 11 is integrally formed with the housing 2.

[0060] The motor housing portion 21 has an air intake port 21A. The motor housing portion 21 has an air exhaust port 21B. The air in the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 21A. The air in the internal space of the housing 2 flows out to the external space of the housing 2 through the air exhaust port 21B.

[0061] The gear case 38 is connected to the front portion of the motor housing 21. The gear case 38 houses the speed reduction mechanism 7. As shown in FIG. 6, the gear case 38 houses the rotor bearing 40 and the spindle bearing 44. The gear case 38 includes a cylindrical portion 38A extending in the front-rear direction, a bottom plate portion 38B, a holding cylindrical portion 38C, and a flange portion 38D. The cylindrical portion 38A is generally cylindrical. The cylindrical portion 38A surrounds the periphery of the speed reduction mechanism 7. The bottom plate portion 38B extends radially inward from the rear end of the cylindrical portion 38A. The holding cylindrical portion 38C is connected to the radially inner end of the bottom plate portion 38B and extends forward. The outer diameter of the holding cylindrical portion 38C is smaller than the inner diameter of the cylindrical portion 38A. The holding cylindrical portion 38C is disposed inside the cylindrical portion 38A. The holding cylindrical portion 38C holds the rotor bearing 40. The rotor 27 is inserted through the holding cylindrical portion 38C. The spindle bearing 44 is disposed between the outer periphery of the holding cylindrical portion 38C and the inner periphery of the cylindrical portion 38A. The speed reduction mechanism 7 is disposed in the space in front of the holding cylindrical portion 38C inside the cylindrical portion 38A. The flange portion 38D extends radially outward from the front end portion of the cylindrical portion 38A. A screw boss portion 38H (see FIG. 7) is provided on the flange portion 38D. The gear case 38 is made of metal. In the embodiment, the gear case 38 is made of aluminum.

[0062] The hammer housing 3 houses the spindle 8. The hammer housing 3 houses the hammer 47. The hammer housing 3 houses the striking mechanism 9 including the hammer 47. The hammer housing 3 houses a part of the anvil 10. The hammer housing 3 is made of metal. In the embodiment, the hammer housing 3 is made of aluminum. The hammer housing 3 is cylindrical. In the embodiment, the hammer housing 3 is cylindrical.

[0063] The hammer housing portion 3 includes a rear cylinder portion 3A, a front cylinder portion 3B, a front surface portion 3C, and a screw boss portion 3H. The front cylinder portion 3B is disposed forward of the rear cylinder portion 3A. The outer diameter of the rear cylinder portion 3A is larger than the outer diameter of the front cylinder portion 3B. The inner diameter of the rear cylinder portion 3A is larger than the inner diameter of the front cylinder portion 3B. The front surface portion 3C constitutes the front end face of the hammer housing portion 3. The front surface portion 3C extends radially inward from the front end portion of the rear cylinder portion 3A. The front surface portion 3C is disposed so as to connect the front end portion of the rear cylinder portion 3A and the rear end portion of the front cylinder portion 3B. The front surface portion 3C is annular. The front cylinder portion 3B is disposed so as to protrude forward from the front surface portion 3C.

[0064] The hammer housing portion 3 is connected to the front portion of the gear case 38. The motor housing portion 21 and the gear case 38 are fixed to the rear portion of the hammer housing portion 3 by screws 5. The screws 5 are sequentially inserted into the opening provided in the screw boss portion 2H, the opening provided in the screw boss portion 38H, and the screw hole provided in the screw boss portion 3H from behind the screw boss portion 2H. Four screw boss portions 2H, screw boss portions 38H, and screw boss portions 3H are provided in the circumferential direction, respectively. Four screws 5 are provided in the circumferential direction. The hammer housing portion 3, the gear case 38, and the motor housing portion 21 are fixed to each other by the screws 5.

[0065] At least a part of the rear portion of the gear case 38 is accommodated in the motor housing portion 21. At least a part of the front portion of the gear case 38 is accommodated in the hammer housing portion 3. The hammer housing portion 3 is fixed in the front-rear direction to the housing 2 by the screws 5. The hammer housing portion 3 is placed on the upper surface of the handle portion 11. That is, the hammer housing portion 3 is placed on the upper surfaces of the grip portion 22, the support portion 24, and the connecting portion 25.

[0066] The motor 6 is the power source of the impact tool 1. The motor 6 generates a rotational force. The motor 6 is an electric motor. The motor 6 is an inner rotor type brushless motor. The motor 6 has a stator 26 and a rotor 27. The stator 26 is supported by the motor housing portion 21. At least a part of the rotor 27 is disposed inside the stator 26. The rotor 27 rotates with respect to the stator 26. The rotor 27 rotates about a rotation axis AX extending in the front-rear direction.

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

[0068] The stator core 28 is disposed radially outside the rotor 27. The stator core 28 includes a plurality of laminated steel plates. The steel plate is a metal plate mainly composed of iron. The stator core 28 is cylindrical. The stator core 28 has a plurality of teeth for supporting the coil 31.

[0069] The front insulator 29 is provided at the front portion of the stator core 28. The rear insulator 30 is provided at the rear portion of the stator core 28. Each of the front insulator 29 and the rear insulator 30 is an electric insulating member made of synthetic resin. The front insulator 29 is disposed so as to cover a part of the surface of the teeth. The rear insulator 30 is disposed so as to cover a part of the surface of the teeth.

[0070] The coil 31 is attached to the stator core 28 via the front insulator 29 and the rear insulator 30. A plurality of coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulator 29 and the rear insulator 30. The coil 31 and the stator core 28 are electrically insulated by the front insulator 29 and the rear insulator 30.

[0071] The rotor 27 rotates about the rotation axis AX. The rotor 27 has a rotor core portion 32, a rotor shaft portion 33, and rotor magnets 34.

[0072] Each of the rotor core portion 32 and the rotor shaft portion 33 is made of steel. In the embodiment, the rotor core portion 32 and the rotor shaft portion 33 are integral. The front portion of the rotor shaft portion 33 protrudes forward from the front end face of the rotor core portion 32. The rear portion of the rotor shaft portion 33 protrudes rearward from the rear end face of the rotor core portion 32.

[0073] The rotor magnet 34 is fixed to the rotor core portion 32. The rotor magnet 34 is flat plate-shaped. The rotor magnet 34 is disposed inside the rotor core portion 32.

[0074] A balancer 35 is provided on the rotor shaft portion 33. The balancer 35 is a weight made of a metal such as brass, and is provided to adjust the weight balance of the rotor 27.

[0075] 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. The magnetic sensor detects the rotational direction position of the rotor 27 by detecting the position of the rotor magnet 34.

[0076] The rear portion of the rotor shaft portion 33 is rotatably supported by a rotor bearing 39. The front portion of the rotor bearing 39 is rotatably supported by a rotor bearing 40. The rotor bearing 39 is held by the rear plate portion 21C of the motor housing portion 21. The rotor bearing 40 is held by the gear case 38. The front end portion of the rotor shaft portion 33 passes through the holding cylinder portion 38C of the gear case 38 and is connected to the speed reduction mechanism 7.

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

[0078] The speed reduction mechanism 7 transmits the rotational force of the motor 6 to the spindle 8 and the anvil 10. The speed reduction mechanism 7 is housed in the gear case 38. The speed reduction mechanism 7 has a plurality of gears. The speed reduction mechanism 7 is disposed forward of the motor 6. The speed reduction mechanism 7 connects the rotor shaft portion 33 and the spindle 8. The gears of the speed reduction mechanism 7 are driven by the rotor 27. The speed reduction mechanism 7 transmits the rotation of the rotor 27 to the spindle 8. The speed reduction mechanism 7 rotates the spindle 8 at a rotational speed lower than the rotational speed of the rotor shaft portion 33. The speed reduction mechanism 7 includes a planetary gear mechanism.

[0079] FIG. 7 is a perspective view showing the speed reduction mechanism 7 according to the embodiment. The speed reduction mechanism 7 has a plurality of planetary gears 42 disposed around the pinion gear 41 and an internal gear 43 disposed around the plurality of planetary gears 42. Each of the pinion gear 41, the planetary gears 42, and the internal gear 43 is housed in the gear case 38. The plurality of planetary gears 42 includes a first planetary gear 42A and a second planetary gear 42B. The first planetary gear 42A meshes with the pinion gear 41 and the first gear portion 42B1 of the second planetary gear 42B. The second planetary gear 42B has a first gear portion 42B1 and a second gear portion 42B2 at different axial positions. The second planetary gear 42B meshes with the internal gear 43 at the second gear portion 42B2. The internal gear 43 is annular and meshes with the second gear portion 42B2. The internal gear 43 is fixed to the gear case 38. The internal gear 43 is always non-rotatable relative to the gear case 38. Each planetary gear 42 (the first planetary gear 42A, the second planetary gear 42B) is rotatably supported by the spindle 8 via a pin 42P. The spindle 8 is rotated by the planetary gears 42.

[0080] When the rotor shaft portion 33 rotates due to the drive of the motor 6, the pinion gear 41 rotates, and the first planetary gear 42A and the second planetary gear 42B revolve around the pinion gear 41. The second planetary gear 42B revolves while meshing with the internal teeth of the internal gear 43. Due to the revolution of each planetary gear 42, the spindle 8 connected to each planetary gear 42 via the pin 42P rotates at a rotational speed lower than the rotational speed of the rotor shaft portion 33.

[0081] As shown in FIG. 6, the spindle 8 rotates by the rotational force of the motor 6. The spindle 8 is disposed forward of at least a part of the motor 6. The spindle 8 is disposed forward of the stator 26. At least a part of the spindle 8 is disposed forward of the rotor 27. At least a part of the spindle 8 is disposed forward of the speed reduction mechanism 7. The spindle 8 is rotated by the rotor 27. The spindle 8 rotates by the rotational force of the rotor 27 transmitted by the speed reduction mechanism 7.

[0082] The spindle 8 has a flange portion 8A and a spindle shaft portion 8B protruding forward from the flange portion 8A. The planetary gear 42 is rotatably supported by the flange portion 8A via the pin 42P. The rotation axis of the spindle 8 coincides with the rotation axis AX of the motor 6. The spindle 8 rotates about the rotation axis AX.

[0083] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle 8 has an arc-shaped rib 8C protruding rearward from the rear portion of the flange portion 8A. The spindle bearing 44 is disposed outside the rib 8C. In the embodiment, the inner ring of the spindle bearing 44 is connected to the rib 8C, and the outer ring of the spindle bearing 44 is supported by the gear case 38.

[0084] 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 speed reduction mechanism 7 and a spindle 8. The striking mechanism 9 strikes an anvil 10 in the rotational direction based on the rotational force of the spindle 8 rotated by the motor 6. The striking mechanism 9 includes a hammer 47, a ball 48, and a coil spring 49. The striking mechanism 9 including the hammer 47 is housed in a hammer housing portion 3.

[0085] FIG. 8 is a cross-sectional view showing the striking mechanism 9 according to the embodiment. As shown in FIGS. 6 and 8, the hammer 47 is disposed forward of the speed reduction mechanism 7. The hammer 47 is housed in a rear cylinder portion 3A. The hammer 47 is disposed around a spindle shaft portion 8B. The hammer 47 is held by the spindle shaft portion 8B. The ball 48 is disposed between the spindle shaft portion 8B and the hammer 47. The coil spring 49 is supported by each of a flange portion 8A and the hammer 47.

[0086] The hammer 47 has an annular body portion 47D, a rear outer cylinder portion 47E protruding rearward from an outer peripheral portion of the body portion 47D, a front outer cylinder portion 47F protruding forward from the outer peripheral portion of the body portion 47D, an inner cylinder portion 47G protruding rearward from an inner peripheral portion of the body portion 47D, a hammer groove 47A, and a hammer protrusion 47B. The body portion 47D is disposed around the spindle shaft portion 8B. The body portion 47D is annular. Each of the rear outer cylinder portion 47E and the inner cylinder portion 47G protrudes rearward from the body portion 47D. A recess 47C is defined by a rear surface of the body portion 47D, an inner peripheral surface of the rear outer cylinder portion 47E, and an outer peripheral surface of the inner cylinder portion 47G. The recess 47C is provided so as to be recessed forward from a rear end portion of the hammer 47. The recess 47C is ring-shaped. The hammer protrusion 47B protrudes forward from the body portion 47D. The hammer protrusion 47B protrudes radially inward from an inner peripheral surface of the front outer cylinder portion 47F. Two hammer protrusions 47B are provided. Since the rear outer cylinder portion 47E and the front outer cylinder portion 47F are provided, the inertial force of the hammer 47 in the rotational direction increases.

[0087] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the speed reduction mechanism 7 and the spindle 8. The hammer 47 is rotatable together with the spindle 8 based on the rotational force of the spindle 8 rotated by the motor 6. The rotation axis of the hammer 47, the rotation axis of the spindle 8, and the rotation axis AX of the motor 6 coincide. The hammer 47 rotates about the rotation axis AX.

[0088] The ball 48 is made of a metal such as steel. The ball 48 is disposed between the spindle shaft portion 8B and the hammer 47. The spindle 8 has a spindle groove 8D in which at least a part of the ball 48 is disposed. The spindle groove 8D is provided in a part of the outer peripheral surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47A in which at least a part of the ball 48 is disposed. The hammer groove 47A is provided in a part of the inner surface of the inner cylinder portion 47G. The ball 48 is disposed between the spindle groove 8D and the hammer groove 47A. The ball 48 can roll inside the spindle groove 8D and inside the hammer groove 47A respectively. 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 direction and the rotational direction within the movable range defined by the spindle groove 8D and the hammer groove 47A.

[0089] The coil spring 49 generates an elastic force for moving the hammer 47 forward. The coil spring 49 is disposed between the flange portion 8A and the hammer 47. The coil spring 49 is provided around the spindle shaft portion 8B. A washer 45A is provided inside the recess 47C. The washer 45A is supported by the body portion 47D via the ball 45B. The ball 45B is disposed in a ball groove 47H (see FIG. 8) provided on the rear surface of the body portion 47D. The rear end portion of the coil spring 49 is supported by the flange portion 8A. The front end portion of the coil spring 49 is disposed inside the recess 47C and supported by the washer 45A.

[0090] The anvil 10 is the output part of the impact tool 1 that is actuated by the rotational force of the motor 6. The anvil 10 rotates by the rotational force of the motor 6. At least a part of the anvil 10 is disposed forward of the hammer 47.

[0091] The anvil 10 has a rod-shaped anvil shaft portion 10C and an anvil protrusion portion 10D. The outer shape of the anvil shaft portion 10C orthogonal to the rotation axis AX is substantially square. The socket, which is the tip tool, is attached to the anvil shaft portion 10C. A recess 10B is provided at the rear end portion of the anvil 10. A convex portion 8E is provided at the front end portion of the spindle shaft portion 8B. The convex portion 8E at the front end portion of the spindle shaft portion 8B is inserted into the recess 10B provided at the rear end portion of the anvil 10. The anvil protrusion portion 10D is provided at the rear end portion of the anvil 10. The anvil protrusion portion 10D protrudes radially outward from the rear end portion of the anvil shaft portion 10C.

[0092] The anvil 10 is rotatably supported by the anvil bearing 46. The rotation axis of the anvil 10, the rotation axis of the hammer 47, the rotation axis of the spindle 8, and the rotation axis AX of the motor 6 coincide. The anvil 10 rotates about the rotation axis AX. The anvil bearing 46 is disposed on the inner circumference of the front cylinder portion 3B of the hammer housing portion 3. The anvil bearing 46 is held by the front cylinder portion 3B. The front cylinder portion 3B is disposed around the anvil shaft portion 10C. The anvil bearing 46 rotatably supports the anvil shaft portion 10C. Thereby, the anvil bearing 46 supports the anvil 10 in the rotational direction. A groove portion 10E facing the front cylinder portion 3B is formed on the outer peripheral surface of the anvil shaft portion 10C. A lubricant is disposed in the groove portion 10E. The gap between the front end opening of the front cylinder portion 3B and the anvil shaft portion 10C is sealed by the seal member 46A.

[0093] The hammer protrusion portion 47B can contact the anvil protrusion portion 10D. With the hammer protrusion portion 47B and the anvil protrusion portion 10D in contact, when the motor 6 is driven, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0094] The anvil 10 is struck in the rotational direction by the hammer 47. For example, in a screwing operation, when the load acting on the anvil 10 increases, there may be a situation where the anvil 10 cannot be rotated only by the power generated by the motor 6. When the anvil 10 cannot be rotated only by the power generated by the motor 6, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are relatively movable in the axial direction and the circumferential direction via the ball 48. Even when 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 with the rotation of the hammer 47 stopped, the ball 48 moves rearward while being guided by the spindle groove 8D and the hammer groove 47A respectively. The hammer 47 receives a force from the ball 48 and moves rearward along with the ball 48. That is, the hammer 47 moves rearward when the spindle 8 rotates with the rotation of the anvil 10 stopped. When the hammer 47 moves rearward, the contact between the hammer projection 47B and the anvil projection 10D is released.

[0095] The hammer 47 that has moved rearward moves forward by the elastic force of the coil spring 49. When the hammer 47 moves forward, it receives a force in the rotational direction from the ball 48. That is, the hammer 47 moves forward while rotating. When the hammer 47 moves forward while rotating, the hammer projection 47B contacts the anvil projection 10D while rotating. Thereby, the anvil projection 10D is struck in the rotational direction by the hammer projection 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 about the rotation axis AX with high torque.

[0096] As shown in FIG. 6, the fan 12 rotates by the rotational force of the motor 6. The fan 12 is disposed forward of the stator 26 of the motor 6. The fan 12 generates an air flow for cooling the motor 6. The fan 12 is fixed to the rotor 27. The fan 12 is fixed to the front portion of the rotor shaft portion 33. The fan 12 is disposed between the rotor bearing 40 and the stator 26. The fan 12 rotates by the rotation of the rotor 27. When the rotor shaft portion 33 rotates, the fan 12 rotates together with the rotor shaft portion 33. When the fan 12 rotates, air in the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 21A. The air that has flowed into the internal space of the housing 2 cools the motor 6 by flowing through the internal space of the housing 2. The air that has flowed through the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 21B due to the rotation of the fan 12.

[0097] As shown in FIG. 4, the battery pack 80 is attached to the battery holding portion 23. The battery pack 80 functions as a power source for the impact tool 1. The battery pack 80 includes a secondary battery. In an embodiment, the battery pack 80 includes a rechargeable lithium ion battery. By being attached to the battery holding portion 23, the battery pack 80 can supply power to the impact tool 1. Each of the motor 6 and the light emitting unit 16 is driven based on the power supplied from the battery pack 80.

[0098] The battery pack 80 has a release switch 81. The release switch 81 is disposed at the front portion of the upper surface of the battery pack 80. The release switch 81 is a push button type. The release switch 81 moves downward when pressed downward. The release switch 81 is biased upward by a biasing member (not shown). The release switch 81 has an engagement hook portion 82 that protrudes upward from the upper surface of the battery pack 80 at the upward movement limit position and a finger placement portion 84 that an operator presses downward.

[0099] The battery holding part 23 has an engaging recessed part 23A that contacts the engaging hook part 82. The engaging recessed part 23A is recessed upward from the lower surface of the battery holding part 23. When the engaging hook part 82 enters the inside of the engaging recessed part 23A, the battery holding part 23 engages so that the battery pack 80 does not come off. By pressing the finger placement part 84 to push down the release switch 81 and when the engaging hook part 82 disengages downward from the engaging recessed part 23A, the battery pack 80 can be removed from the battery holding part 23. The front part of the lower surface part of the battery holding part 23 is inclined obliquely upward toward the front. Among the upper surface of the battery pack 80, the front part where the release switch 81 is provided is inclined obliquely downward toward the front.

[0100] The battery holding part 23 has a controller 17 that controls the light emitter unit 16 and an interface panel 18. The controller 17 includes a computer system. The controller 17 outputs a control command for controlling the motor 6. The controller 17 includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or a storage, a volatile memory such as a RAM (Random Access Memory), a transistor, a capacitor, and a resistor.

[0101] Based on the operation of the interface panel 18, the controller 17 sets the driving conditions of the motor 6. As described above, the driving conditions of the motor 6 include a current threshold value.

[0102] The interface panel 18 is provided on the battery holding part 23. The interface panel 18 includes an operating device and a display device. The interface panel 18 is plate-shaped. The operating device includes operating buttons. Examples of the display device include a segment display including a plurality of segment light emitters, a flat panel display such as a liquid crystal display, and an indicator type display in which a plurality of light emitting diodes are arranged.

[0103] The trigger lever 14 is provided on the grip portion 22. The trigger lever 14 is operated by the operator to start the motor 6. When the trigger lever 14 is operated, the driving and stopping of the motor 6 are switched.

[0104] The forward / reverse switching lever 15 is provided above the grip portion 22. The forward / reverse switching lever 15 is operated by the operator. When the forward / reverse switching lever 15 is operated, the rotation direction of the motor 6 is switched from one of the forward rotation direction and the reverse rotation direction to the other. When the rotation direction of the motor 6 is switched, the rotation direction of the spindle 8 is switched.

[0105] <Light emitter unit> FIG. 9 is a longitudinal sectional view showing the upper part of the impact tool 1 according to the embodiment. FIG. 10 is an exploded perspective view showing the light emitter unit 16 according to the embodiment. FIG. 11 is an exploded perspective view of the light emitter unit 16 according to the embodiment as viewed from the rear. FIG. 12 is an exploded perspective view showing the light emitter unit 16 and the installation portion 3D according to the embodiment. FIG. 13 is a view from the front showing the light emitter unit 16 arranged in the installation portion 3D. FIG. 14 is a perspective view showing the opening 24A of the support portion 24 according to the embodiment. FIG. 15 is a view of the slit 3G of the hammer housing portion 3 according to the embodiment as viewed from below.

[0106] The light emitter unit 16 emits illumination light. The light emitter unit 16 illuminates the anvil 10 and the periphery of the anvil 10 with the illumination light. The light emitter unit 16 illuminates the front end side of the anvil 10 with the illumination light.

[0107] The light emitter unit 16 is arranged at the front part of the hammer housing portion 3. The light emitter unit 16 is arranged on the front surface portion 3C of the hammer housing portion 3. The light emitter unit 16 is arranged around the front cylinder portion 3B. The light emitter unit 16 is formed so as to surround the anvil 10. The light emitter unit 16 is arranged around the anvil shaft portion 10C via the front cylinder portion 3B. In the embodiment, the light emitter unit 16 has an annular shape surrounding the anvil 10.

[0108] The light emitter unit 16 includes a plurality of light emitters 52. The light emitter 52 is an LED (light emitting diodes) element. In an embodiment, the light emitter unit 16 includes a chip on board light emitting diode (COB LED: chip on board LED) light (hereinafter referred to as a COB light 50). The COB light 50 irradiates light to the front end side of the anvil 10.

[0109] The COB light 50 has a substrate 51 and a plurality of light emitters 52. Examples of the substrate 51 include an aluminum substrate, a glass cloth base epoxy resin substrate (FR-4 substrate), or a composite base epoxy resin substrate (CEM-3 substrate). The light emitter 52 is mounted on the surface of the substrate 51. The light emitter 52 and the substrate 51 are connected via a gold wire (not shown). The gold wire connects the plurality of light emitters 52 to each other. The plurality of light emitters 52 are surrounded by a bank. A phosphor is disposed in the partition space surrounded by the bank. The light emitter 52 is covered by a phosphor 53. A pair of electrodes (not shown) are disposed on the surface (front surface) or the back surface (rear surface) of the substrate 51 outside the bank. Of the pair of electrodes, one electrode is a positive electrode and the other electrode is a negative electrode. Lead wires 60 are connected to the pair of electrodes respectively. The power output from the battery pack 80 is supplied to the electrodes via the lead wires 60. The power supplied to the electrodes is supplied to the light emitter 52 via the substrate 51 and the gold wire. The light emitter 52 emits light based on the power supplied from the battery pack 80. The voltage of the battery pack 80 is applied to the light emitter 52 in a state of being stepped down to 5V by the controller 17. The controller is housed in the battery holding portion 23. The light emitter unit 16 and the controller are connected via the lead wire 60.

[0110] The COB light 50 is annular. The COB light 50 is disposed around the anvil shaft portion 10C via the front cylinder portion 3B. The substrate 51 has an annular portion 51A and a support portion 51B that projects downward from the lower portion of the annular portion 51A. The substrate 51 is provided so as to surround the anvil shaft portion 10C.

[0111] The plurality of light emitters 52 are arranged in the circumferential direction around the anvil 10. The light emitters 52 are arranged on at least a part of the periphery of the anvil shaft portion 10C via the front cylinder portion 3B. The light emitters 52 are mounted on the front surface of the annular portion 51A of the substrate 51. The plurality of light emitters 52 are arranged side by side along the circumferential direction. A plurality of light emitters 52 are arranged at intervals in the circumferential direction of the annular portion 51A. The number of the light emitters 52 is not limited as long as it is plural. In the embodiment, 24 light emitters 52 are arranged at equal intervals in the circumferential direction of the annular portion 51A (see FIG. 13).

[0112] The phosphor 53 is arranged on the front surface of the annular portion 51A of the substrate 51. The phosphor 53 is continuous so as to cover the surfaces of the plurality of light emitters 52 and the regions between the plurality of light emitters 52. The phosphor 53 is annular. The phosphor 53 is arranged so as to cover each of the plurality of light emitters 52.

[0113] The light emitter unit 16 has an optical member 55.

[0114] The optical member 55 is connected to the COB light 50. The optical member 55 is fixed to the substrate 51. The optical member 55 is made of polycarbonate resin. In the embodiment, the optical member 55 is made of polycarbonate resin containing a white diffusing material. The optical member 55 is milky white. The optical member 55 transmits at least a part of the light emitted from the COB light 50. The light transmittance of the optical member 55 is, for example, 40% or more and 70% or less. The optical member 55 diffuses the light of the plurality of light emitters 52.

[0115] The optical member 55 is arranged so as to cover the front side of the plurality of light emitters 52. At least a part of the optical member 55 is arranged in front of the COB light 50. The optical member 55 is continuous so as to straddle the plurality of light emitters 52. The optical member 55 is annular. The optical member 55 has an outer cylinder portion 55A, an inner cylinder portion 55B, a light transmission portion 55C, and a convex portion 55D.

[0116] The outer cylinder part 55A is arranged radially outside the inner cylinder part 55B. The outer cylinder part 55A is arranged on the outer peripheral side of the COB light 50. The outer cylinder part 55A is arranged radially outside the light-emitting body 52. In the radial direction, the COB light 50 is arranged between the outer cylinder part 55A and the inner cylinder part 55B. The outer cylinder part 55A is arranged radially outside the annular part 51A of the substrate 51. The inner cylinder part 55B is arranged on the inner peripheral side of the COB light 50. The inner cylinder part 55B is arranged radially inside the annular part 51A of the substrate 51. The inner cylinder part 55B is arranged radially inside the light-emitting body 52.

[0117] The light-transmitting part 55C is arranged in front of the COB light 50. The light-transmitting part 55C is annular. The light-transmitting part 55C is arranged in front of the light-emitting body 52. The light-transmitting part 55C is arranged so as to connect the front end part of the outer cylinder part 55A and the front end part of the inner cylinder part 55B. The light-transmitting part 55C faces the front surface of the annular part 51A. The light-transmitting part 55C faces the light-emitting body 52. The light emitted from the light-emitting body 52 passes through the light-transmitting part 55C and is irradiated in front of the light-emitting unit 16. The front surface of the light-transmitting part 55C constitutes the front surface 16A of the light-emitting unit 16.

[0118] The convex part 55D is arranged below the light-transmitting part 55C. The convex part 55D is provided so as to protrude downward from the lower part of the outer cylinder part 55A. As shown in FIG. 11, a housing space is formed on the rear surface of the convex part 55D. The support part 51B of the substrate 51 is arranged in the housing space formed on the rear surface of the convex part 55D. The convex part 55D covers and protects the front of the lead wire 60 passing behind the substrate 51. Further, the convex part 55D functions as a positioning part of the light-emitting unit 16 in the rotational direction by being arranged in the slit 3G of the hammer housing part 3 described later.

[0119] The rear surface of the substrate 51 is arranged in front of the rear end part of the outer cylinder part 55A and the rear end part of the inner cylinder part 55B. At least a part of the rear surface of the substrate 51 and the inner peripheral surface of the outer cylinder part 55A are fixed by an adhesive. At least a part of the rear surface of the substrate 51 and the outer peripheral surface of the inner cylinder part 55B are fixed by an adhesive. The COB light 50 and the optical member 55 are fixed.

[0120] The hammer housing portion 3 supports the light emitter unit 16 at the front portion 3C. The hammer housing portion 3 has an installation portion 3D for housing the light emitter unit 16. The installation portion 3D is arranged at the front portion 3C of the hammer housing portion 3. The installation portion 3D is arranged between the front cylinder portion 3B and the outer periphery of the front portion 3C. The installation portion 3D is integrally formed with the hammer housing portion 3. The installation portion 3D is provided circumferentially along the outer periphery of the front cylinder portion 3B. In the embodiment, the installation portion 3D is annular and concave. The light emitter unit 16 is housed inside the annular and concave installation portion 3D. The installation portion 3D houses at least a part of the light emitter unit 16. The installation portion 3D does not have to be a completely continuous ring shape and may be partially discontinuous. A part of the light emitter unit 16 may be arranged outside the installation portion 3D. At least a part of the light emitter unit 16 is arranged between the outer peripheral surface 3E of the hammer housing portion 3 and the front cylinder portion 3B.

[0121] The hammer housing portion 3 has a wall portion 3F surrounding the outer periphery of the light emitter unit 16. The wall portion 3F projects forward from the front portion 3C of the hammer housing portion 3. The wall portion 3F is provided circumferentially along the outer peripheral edge of the front portion 3C of the hammer housing portion 3. The wall portion 3F is substantially annular, but a slit 3G portion is cut out. The wall portion 3F surrounds the entire circumference of the light emitter unit 16 except for the convex portion 55D portion.

[0122]

[0123] ​The wall portion 3F is at the same position as the front surface 16A of the light emitter unit 16 or extends forward beyond the front surface 16A of the light emitter unit 16. In the embodiment, the wall portion 3F protrudes slightly forward beyond the front surface 16A of the light emitter unit 16. Note that the front cylinder portion 3B on the inner peripheral side of the light emitter unit 16 also extends forward beyond the front surface 16A of the light emitter unit 16. The front cylinder portion 3B extends forward beyond the wall portion 3F.

[0124] The COB light 50 is disposed inside the installation portion 3D. At least a part of the optical member 55 is disposed inside the installation portion 3D. The light transmission portion 55C is disposed inside the installation portion 3D. Each of the outer cylinder portion 55A and the inner cylinder portion 55B is disposed inside the installation portion 3D.

[0125] A snap ring groove 3J is provided in the front cylinder portion 3B. The snap ring groove 3J is provided on the front side of the front surface 16A of the light emitter unit 16. A snap ring 56 is disposed in the snap ring groove 3J. The snap ring 56 functions as a stopper against the forward movement of the light emitter unit 16. The snap ring 56 supports the optical member 55 from the front side.

[0126] The wall portion 3F has a slit 3G through which the lead wire 60 passes. As shown in FIG. 14, a support column portion 24 is disposed directly below the front surface portion 3C of the hammer housing portion 3. The lower portion of the wall portion 3F faces the support column portion 24 vertically. The slit 3G is provided in a portion of the wall portion 3F that faces the support column portion 24. The slit 3G penetrates the inner peripheral surface and the outer peripheral surface of the wall portion 3F in the radial direction. In the embodiment, the slit 3G is a notch formed from the front end to the rear end of the wall portion 3F. The slit 3G may be a through hole that penetrates in a window shape between the front end and the rear end of the wall portion 3F.

[0127] The support column portion 24 has an upper end surface 24B that curves along the outer peripheral surface of the wall portion 3F. At the upper end surface 24B, an opening 24A is formed at a position facing the slit 3G. The opening 24A communicates with the internal space of the support column portion 24. The installation portion 3D on the inner peripheral side of the wall portion 3F and the internal space of the support column portion 24 face each other through the slit 3G and the opening 24A. Thereby, the slit 3G connects the light-emitting unit 16 and the inside of the support column portion 24. As shown in FIGS. 12 and 13, among the light-emitting unit 16, the convex portion 55D of the optical member 55 and the support portion 51B of the substrate 51 are disposed inside the slit 3G.

[0128] A buffer member 57 is disposed between the hammer housing portion 3 and the light-emitting unit 16. The buffer member 57 is disposed behind the COB light 50. The buffer member 57 is an elastic body and is made of, for example, a rubber material. The buffer member 57 has light-shielding properties. The buffer member 57 is black. The buffer member 57 protects the substrate 51 and the optical member 55 made of a resin material from contact with the hammer housing portion 3 which is a metal vibrating body. The buffer member 57 covers the rear surface of the light-emitting unit 16 and at least one of the inner peripheral surface and the outer peripheral surface 3E of the light-emitting unit 16. In the embodiment, the buffer member 57 covers the rear surface of the light-emitting unit 16 and the inner peripheral surface of the light-emitting unit 16.

[0129] The buffer member 57 includes a bottom plate portion 57A, an inner peripheral wall portion 57B, and a protruding portion 57C.

[0130] The bottom plate portion 57A covers the rear surface of the light-emitting unit 16. The bottom plate portion 57A is flat and annular. The bottom plate portion 57A is installed on the bottom surface of the installation portion 3D. The rear surface of the bottom plate portion 57A contacts the bottom surface of the installation portion 3D. The front surface of the bottom plate portion 57A contacts the rear surface of the optical member 55. Specifically, the rear surface of the optical member 55 is the rear surface of the outer cylinder portion 55A and the rear surface of the inner cylinder portion 55B. The bottom plate portion 57A is spaced apart rearward from the substrate 51 of the light-emitting unit 16. The inner circumference of the bottom plate portion 57A contacts the front cylinder portion 3B of the hammer housing portion 3. The outer circumference of the bottom plate portion 57A contacts the wall portion 3F of the hammer housing portion 3. The bottom plate portion 57A covers substantially the entire bottom surface of the installation portion 3D.

[0131] The inner peripheral wall portion 57B covers the inner peripheral surface of the light emitter unit 16. The inner peripheral wall portion 57B projects forward from the inner peripheral edge of the bottom plate portion 57A. The inner peripheral wall portion 57B extends circumferentially along the inner peripheral edge of the bottom plate portion 57A. The inner peripheral surface of the inner peripheral wall portion 57B contacts the front cylinder portion 3B of the hammer housing portion 3. The outer peripheral surface of the inner peripheral wall portion 57B contacts the inner cylinder portion 55B of the optical member 55. The optical member 55 is fixed to the front cylinder portion 3B via the inner peripheral wall portion 57B by fitting the inner cylinder portion 55B onto the outer periphery of the inner peripheral wall portion 57B. Thereby, displacement of the light emitter unit 16 in the radial direction (vertical direction and horizontal direction) is prevented.

[0132] Four inner peripheral wall portions 57B are provided at equal angular intervals in the rotational direction. A recess 57D is formed by the gaps between the four inner peripheral wall portions 57B. Four recesses 57D are provided at four locations by the gaps between adjacent inner peripheral wall portions 57B. A rib 55E provided on the inner cylinder portion 55B of the optical member 55 is disposed in the recess 57D. By engaging the recess 57D and the rib 55E, displacement of the light emitter unit 16 in the rotational direction is prevented. The thickness of the inner peripheral wall portion 57B is larger than the protruding amount of the rib 55E from the inner cylinder portion 55B. Therefore, the rib 55E is disposed outside the inner peripheral surface of the inner peripheral wall portion 57B and is separated from the front cylinder portion 3B of the hammer housing portion 3.

[0133] The protruding portion 57C projects downward from the lower portion of the bottom plate portion 57A. As shown in FIG. 12, the protruding portion 57C is disposed inside the slit 3G of the wall portion 3F. The protruding portion 57C is disposed between the rear surface of the light emitter unit 16 and the front surface portion 3C of the hammer housing portion 3 inside the slit 3G. The protruding portion 57C covers the front surface portion 3C of the hammer housing portion 3 inside the slit 3G. The protruding portion 57C has a flat plate shape along the front surface portion 3C. The rear surface of the protruding portion 57C contacts the front surface portion 3C.

[0134] A pair of protrusions 57E are formed at both left and right ends of the protruding portion 57C in the left-right direction. The pair of protrusions 57E protrude forward from the protruding portion 57C. The pair of protrusions 57E are in contact with the end faces (inner surfaces of the slit 3G) of the wall portion 3F in the left-right direction inside the slit 3G respectively. The pair of protrusions 57E are arranged at intervals from each other. A convex portion 55D of the optical member 55 is arranged between the pair of protrusions 57E. The pair of protrusions 57E are in contact with the side surfaces of the convex portion 55D of the optical member 55 respectively. The light-emitting unit 16 is clamped from the left and right by the pair of protrusions 57E of the buffer member 57 at the portion of the convex portion 55D. The pair of protrusions 57E are sandwiched between the convex portion 55D of the light-emitting unit 16 and the wall portion 3F of the hammer housing portion 3 inside the slit 3G. Therefore, even if the hammer housing portion 3 vibrates, contact with the hammer housing portion 3 is avoided by the buffer member 57.

[0135] With such a configuration, the light-emitting unit 16 is held by the hammer housing portion 3 via the buffer member 57 at the installation portion 3D in a non-contact state with the hammer housing portion 3. Even when the hammer housing portion 3 vibrates due to the hammer 47 colliding with the anvil 10, the buffer member 57 prevents the light-emitting unit 16 from coming into direct contact with the hammer housing portion 3.

[0136] Also, as shown in FIG. 15, the impact tool 1 includes a guide portion GD that guides a lead wire 60 passing through the slit 3G so as not to come into contact with the hammer housing portion 3. The guide portion GD is constituted by a passage portion surrounded by the buffer member 57 and the convex portion 55D inside the slit 3G.

[0137] As described above, the slit 3G is partitioned at the rear by the front surface portion 3C of the hammer housing portion 3, partitioned in the left and right directions by the end faces of the wall portion 3F, and open at the front. The buffer member 57 covers the front surface portion 3C by the protruding portion 57C. The buffer member 57 covers the end faces of the left and right wall portions 3F by the pair of protrusions 57E.

[0138] Here, the rear surface of the convex portion 55D of the light emitter unit 16 is disposed at a position spaced forward from the protruding portion 57C of the buffer member 57. The rear surface of the convex portion 55D is positioned forward of the rear surface of the outer cylinder portion 55A and the rear surface of the inner cylinder portion 55B. Therefore, with the rear surfaces of the outer cylinder portion 55A and the inner cylinder portion 55B in contact with the bottom plate portion 57A of the buffer member 57, the rear surface of the convex portion 55D is positioned forward of the protruding portion 57C. As a result, as shown in FIG. 15, when the slit 3G is viewed from below upward, a space is formed that is surrounded by the buffer member 57 in the left - right direction and the rearward direction, and is surrounded by the convex portion 55D in the forward direction. The lead wire 60 passes through the space surrounded by the buffer member 57 and the convex portion 55D, and passes inside the slit 3G without directly contacting the hammer housing portion 3. Therefore, in the embodiment, the buffer member 57 and the convex portion 55D function as a guide portion GD. Here, a part of the buffer member 57 and the optical member 55 is used as the guide portion GD, but for example, a cylindrical member may be provided inside the slit 3G and used as the guide portion GD.

[0139] As shown in FIG. 9, the convex portion 55D of the light emitter unit 16 enters the inside of the support column portion 24. The lower end portion of the convex portion 55D passes through the slit 3G and is disposed inside the support column portion 24. The convex portion 55D within the opening 24A of the support column portion 24 and the upper end surface 24B (see FIG. 14) of the support column portion 24 overlap in a range of length E. For this reason, also in the portion of the gap between the upper end surface 24B of the support column portion 24 and the slit 3G, the lead wire 60 is covered by the convex portion 55D without being exposed forward.

[0140] The lead wire 60 passes through the inside of the support column portion 24. The lead wire 60 passes upward from the opening 24A on the upper end surface 24B of the support column portion 24 through the inside of the slit 3G of the hammer housing portion 3 (inside the guide portion GD) and is connected to the light-emitting unit 16. The lead wire 60 is connected to the electrode on the rear surface of the substrate 51 between the light-emitting unit 16 and the buffer member 57. The lead wire 60 advances downward from the opening 24A of the support column portion 24 and reaches the battery holding portion 23. The lead wire 60 is connected to the controller 17 (see FIG. 16) disposed within the battery holding portion 23. In this manner, the lead wire 60 passes from the upper end portion to the lower end portion of the support column portion 24 and is connected to the controller 17. One end of the lead wire 60 is disposed at a position above the upper end of the support column portion 24 (the front portion 3C of the hammer housing portion 3). The other end of the lead wire 60 is disposed at a position below the lower end of the support column portion 24 (the battery holding portion 23).

[0141] <First protective cover and second protective cover> The impact tool 1 includes a first protective cover 61 and a second protective cover 62. The first protective cover 61 and the second protective cover 62 each cover a range including a part of the light-emitting unit 16.

[0142] As shown in FIGS. 1 to 4, the first protective cover 61 is disposed on the outer peripheral portion of the front portion 3C of the hammer housing portion 3. The first protective cover 61 covers the wall portion 3F including the slit 3G, the end portion of the support column portion 24 adjacent to the slit 3G, and the outer peripheral portion of the front surface 16A of the light-emitting unit 16. For this reason, the first protective cover 61 covers the passage path of the lead wire 60 that enters the opening 24A of the support column portion 24 from the light-emitting unit 16 through the slit 3G from the front. The first protective cover 61 has an annular shape. The first protective cover 61 covers the range including the outer peripheral edge of the front portion 3C of the hammer housing portion 3 over the entire circumference.

[0143] The second protective cover 62 is disposed on the inner peripheral portion of the front surface portion 3C of the hammer housing portion 3. That is, the second protective cover 62 is disposed on the portion of the front surface portion 3C that is the front cylinder portion 3B. The second protective cover 62 covers the front cylinder portion 3B and the inner peripheral portion of the front surface 16A of the light emitter unit 16. Further, the second protective cover 62 covers the snap ring 56 attached to the front cylinder portion 3B. The second protective cover 62 has an annular shape. The second protective cover 62 covers the front surface and the circumferential side surface of the front cylinder portion 3B.

[0144] The first protective cover 61 and the second protective cover 62 are made of an elastic body such as a rubber material. The first protective cover 61 and the second protective cover 62 have light-shielding properties. The first protective cover 61 and the second protective cover 62 are, for example, black. In the embodiment, the outer periphery of the front surface 16A of the light emitter unit 16 is covered by the first protective cover 61. The inner periphery of the front surface 16A of the light emitter unit 16 is covered by the second protective cover 62. The inner periphery of the first protective cover 61 and the outer periphery of the second protective cover 62 are concentric. The front surface 16A of the light emitter unit 16 is exposed forward in the circular annular portion between the first protective cover 61 and the second protective cover 62. This annular portion serves as the light emission region from the light emitter unit 16 to the outside. The annular portion faces the light emitter 52 in the front-rear direction. The width of the annular portion is larger than the radial length of the light emitter 52. Thereby, the emitted light from the light emitter unit 16 is restricted to the range that goes forward from the annular portion.

[0145] The first protective cover 61 and the second protective cover 62 suppress the contact of an obstacle with the light emitter unit 16 when the impact tool 1 is used. The first protective cover 61 and the second protective cover 62 protect so as not to damage an external object when the front surface portion 3C or the front cylinder portion 3B of the metal hammer housing portion 3 collides with an external object during the use of the impact tool 1. The first protective cover 61 and the second protective cover 62 restrict the light emission region on the front surface 16A of the light emitter unit 16 to the annular portion, thereby suppressing light leakage from the slit 3G and the convex portion 55D, excessive wide-angle light diffusion, and unnecessary surface reflection of the hammer housing portion 3 including the front cylinder portion 3B.

[0146] As shown in FIGS. 6 and 8, on the outer periphery behind the light-emitting unit 16 in the hammer housing portion 3, an outer peripheral protrusion 3K extending circumferentially is formed over a range of approximately 270 degrees in the circumferential direction. The outer peripheral protrusion 3K has two functions. One is a protrusion for preventing the first protective cover 61 from coming off forward. The outer peripheral protrusion 3K is covered by the first protective cover 61. The first protective cover 61 has a recess for covering the outer peripheral protrusion 3K so as to embrace the outer peripheral protrusion 3K across the front and rear of the outer peripheral protrusion 3K. Since the first protective cover 61 is made of an elastic body, the elastic body can stretch, and the first protective cover 61 can come off from the hammer housing portion 3. Due to this outer peripheral protrusion 3K and the recess of the first protective cover 61 that fits into the outer peripheral protrusion 3K, it is difficult for the first protective cover 61 to move forward.

[0147] Another function of the outer peripheral protrusion 3K is a protrusion for protecting the wall portion 3F. The wall portion 3F rises forward from the front surface portion 3C of the hammer housing portion 3. However, if it collides with other members during use, it is assumed that the wall portion 3F may break due to the collision. Therefore, a device for making it difficult for the wall portion 3F to collide is effective. The outer peripheral protrusion 3K is disposed behind the wall portion 3F. When viewed in the cross-section in the vertical, front-rear direction shown in FIG. 6, the wall portion 3F is disposed below and rearward of a virtual plane IL1 that can be drawn by the upper portion 3KU of the outer peripheral protrusion 3K and the upper portion of the anvil 10. Also, when viewed in the cross-section in the left-right, front-rear direction shown in FIG. 8, the wall portion 3F is disposed on the left side and rearward of a virtual plane IL2 that can be drawn by the right portion 3KR of the outer peripheral protrusion 3K and the right portion of the anvil 10. Similarly, the wall portion 3F is disposed on the right side and rearward of a virtual plane IL3 that can be drawn by the left portion 3KL of the outer peripheral protrusion 3K and the left portion of the anvil 10. Thus, the wall portion 3F is formed so as not to protrude outward from the virtual planes IL1, IL2, and IL3. Therefore, the virtual planes IL1, IL2, and IL3 serve as thresholds for protecting the wall portion 3F, and the possibility of the wall portion 3F breaking is reduced.

[0148] <Controller> FIG. 16 is a longitudinal sectional view showing an enlarged lower part of the impact tool 1 according to the embodiment. As the model of the impact tool 1 with a larger maximum tightening torque, the motor 6 becomes larger, and the current flowing through the coil 31 also increases. In order to cope with the increase in current, the controller 17 also tends to become larger. When the battery holding part 23 becomes larger as the controller 17 becomes larger, the operability of the impact tool 1 deteriorates. Therefore, even if the controller 17 is enlarged, it is desirable to suppress an increase in the outer dimensions of the battery holding part 23. Therefore, in the embodiment, by inclining the controller 17 within the battery holding part 23, a large installation space within the battery holding part 23 can be secured.

[0149] The controller 17 is disposed above the battery pack 80 inside the battery holding part 23. The controller 17 is long in the front-rear direction. The battery holding part 23 includes a rear holding part 23B that holds the rear part of the controller 17 and a front holding part 23C that holds the front part of the controller 17. The rear part of the controller 17 is disposed below the lower end part of the grip part 22 in the front-rear direction. The rear part of the controller 17 is disposed between the rear part of the battery pack 80 and the engagement hook part 82 in the front-rear direction. The front part of the controller 17 is disposed below the lower end part of the support column part 24 in the front-rear direction. The front part of the controller 17 is disposed in front of the engagement hook part 82 in the front-rear direction. The front part of the controller 17 and the finger rest part 84 are arranged one above the other (overlap vertically). An engagement recess 23A is disposed below the front part of the controller 17.

[0150] The controller 17 has a flat plate shape. The front part of the controller 17 is disposed above the rear part of the controller 17. The controller 17 is inclined obliquely upward toward the front. The lower surface of the controller 17 is inclined with respect to the lower surface 83 of the battery pack 80.

[0151] <Size of the motor> As described above, in the impact tool 1 of the model with a large maximum tightening torque, the motor 6 becomes larger in size. Along with the increase in the size of the motor 6, the overall length of the impact tool 1 tends to increase. As the overall length of the impact tool 1 increases, the operability of the impact tool 1 deteriorates. Therefore, in the embodiment, while maintaining the maximum tightening torque, the length of the stator 26 in the front-rear direction is shortened, thereby shortening the overall length of the motor 6 in the impact tool 1. By the amount that the overall length of the motor 6 is shortened, the increase in the overall length of the impact tool 1 is suppressed.

[0152] FIG. 17 is a longitudinal sectional view showing an enlarged motor housing portion 21 of the impact tool 1 according to the embodiment. The stator core 28 has a length L1 and an outer diameter D1. The outer diameter D1 is three times or more the length L1. By using the large-diameter stator core 28, the length of the stator 26 is shortened while maintaining the performance. The length L1 of the stator core 28 is smaller than the length L3 of the gear case 38. The outer diameter D1 of the stator core 28 is larger than the outer diameter D6 of the coil spring 49. The outer diameter D1 of the stator core 28 is larger than the diameter D2 of the fan 12. The outer periphery of the stator core 28 is arranged radially outside the outer periphery of the fan 12. Between the motor 6 and the fan 12 is partitioned by a partition wall 21D. An opening 21E serving as an air passage is formed in the partition wall 21D. The inner diameter D3 of the stator core 28 is larger than the inner diameter D4 of the opening 21E. The inner periphery of the stator core 28 is arranged radially outside the opening 21E. The opening 21E faces the end face of the rotor core portion 32 in the front-rear direction.

[0153] The rotor core portion 32 has a length L2 and an outer diameter D5. The outer diameter D5 is larger than the length L2. The outer periphery of the rotor core portion 32 is arranged radially outside the holding cylinder portion 38C of the gear case 38. The length L2 of the rotor core portion 32 is smaller than the length L3 of the gear case 38.

[0154] An example of specific dimensions in this embodiment will be described. As shown in FIG. 6, the overall length of the impact tool 1 is represented by length L11 + length L12 + length L13. The length L11 is the length from the front surface of the anvil 10 to the front surface of the gear case 38. The length L12 is the length from the front surface of the gear case 38 to the rear surface of the gear case 38. The length L13 is the length from the rear surface of the gear case 38 to the rear surface of the motor housing portion 21. The length L11 is 163.2 mm. The length L12 is 30.3 mm. The length L13 is 65.1 mm. The overall length of the impact tool 1 is 258.6 mm. In this configuration, the outer diameter D1 of the stator core 28 is 68 mm. The length L1 of the stator core 28 is 15 mm.

[0155] The reduction in the length L1 of the stator core 28 particularly contributes to shortening the length L13 from the rear surface of the gear case 38 to the rear surface of the motor housing portion 21. In this embodiment, the dimensional ratio R1 obtained by dividing the length (L11 + L12) from the front surface of the anvil 10 to the rear surface of the gear case 38 by the length L13 from the rear surface of the gear case 38 to the rear surface of the motor housing portion 21 satisfies the condition of being 2.6 or more. The dimensional ratio R1 is represented by the following formula. R1 = (L11 + L12) / L13 The dimensional ratio R1 is preferably 2.75 or more, more preferably 2.9 or more. Also, the dimensional ratio R1 is preferably 8.9 or less. In the case of the above-described dimensional example, the dimensional ratio R1 is 2.97.

[0156] Further, in this embodiment, the dimensional ratio R2 obtained by dividing the length (L11 + L12) from the front surface of the anvil 10 to the rear surface of the gear case 38 by the length L1 of the stator core 28 satisfies the condition of being 7.0 or more. The dimensional ratio R2 is represented by the following formula. R2 = (L11 + L12) / L1 The dimensional ratio R2 is preferably 9.5 or more, more preferably 12.0 or more. Also, the dimensional ratio R2 is preferably 38.7 or less. In the case of the above-described dimensional example, the dimensional ratio R2 is 12.9.

[0157] The dimensional ratios R1 and R2 indicate that as the values increase, the ratio of the length dimension occupied by the motor housing portion 21 and the stator 26 in the overall length of the impact tool 1 becomes smaller. Therefore, by configuring as described above, the overall length of the impact tool 1 can be effectively shortened.

[0158] <Side handle> FIG. 18 is a perspective view showing the side handle 90 according to the embodiment. FIG. 19 is a cross-sectional view taken from the front of a cross-section passing through the mounting portion of the side handle 90 according to the embodiment. FIG. 20 is a perspective view showing the band mounting portion 70 according to the embodiment.

[0159] The impact tool 1 is detachable from the side handle 90. The side handle 90 includes a handle base 91, a fastening mechanism 92 provided on the handle base 91, and a band 93 for fastening the impact tool 1. The side handle 90 is detachably fixed to the impact tool 1 by tightening the band 93 surrounding a predetermined portion of the impact tool 1 with the fastening mechanism 92. In FIGS. 1 to 4, for the sake of convenience, only the band 93 of the side handle 90 is shown in a state of being attached to the impact tool 1, and the illustration of the handle base 91 and the fastening mechanism 92 is omitted.

[0160] As shown in FIGS. 1 to 3 and 20, the impact tool 1 has a band mounting portion 70 for attaching a band 93 of the side handle 90. The band mounting portion 70 is provided circumferentially along the outer periphery of the hammer housing portion 3. The band mounting portion 70 is provided so as to pass inside the annular handle portion 11. The band mounting portion 70 is disposed forward of the grip portion 22. The band mounting portion 70 is disposed rearward of the support portion 24. The band mounting portion 70 is disposed at the connection portion 25. Thus, the band mounting portion 70 is provided straddling the hammer housing portion 3 and the housing 2 (connection portion 25). The side handle 90 is detachable from the hammer housing portion 3. The side handle 90 is fixed to the impact tool 1 by surrounding and tightening the hammer housing portion 3 and the housing 2 (connection portion 25) with the band 93. When the side handle 90 is attached, the light-emitting unit 16 is disposed in front of the side handle 90.

[0161] As shown in FIGS. 18 and 19, the handle base 91 has a columnar portion 91A, a first arm 91B, and a second arm 91C. The handle base 91 is made of resin. The first arm 91B extends laterally from one end of the columnar portion 91A. The second arm 91C extends in the same direction as the first arm 91B from the other end of the columnar portion 91A. The first arm 91B and the second arm 91C are bent in a direction approaching each other. The handle base 91 has a C shape by the columnar portion 91A, the first arm 91B, and the second arm 91C. A resin handle grip 94 is provided on the columnar portion 91A. The handle grip 94 is a cylindrical member surrounding the columnar portion 91A and is gripped by the operator's hand. The handle base 91 holds the tightening mechanism 92 and the band 93. The handle base 91 holds the tightening mechanism 92 by the first arm 91B and the second arm 91C. A first holding portion 95 is provided at the tip of the first arm 91B. A second holding portion 96 is provided at the tip of the second arm 91C.

[0162] The first holding part 95 has a cylindrical shape. The inner diameter of the inner opening facing the second holding part 96 of the first holding part 95 is smaller than the inner diameter of the outer opening facing the direction opposite to the second holding part 96, and the inner diameter is constricted in a stepped manner. The first holding part 95 holds the cam member 97. The cam member 97 has a cylindrical shape, and the outer peripheral surface is constricted in a stepped manner in accordance with the inner surface of the first holding part 95. The cam member 97 is inserted into the first holding part 95 from the outer opening of the first holding part 95 and engages with the stepped part of the inner surface of the first holding part 95. The cam member 97 can move along the central axis BX of the bolt 98A within the range from the outer opening of the first holding part 95 to the stepped part inside the first holding part 95. The cam member 97 has a cam engagement surface 97A facing the second holding part 96. The cam engagement surface 97A is an engagement surface with an uneven pattern. The cam member 97 has an insertion hole 97B through which the shaft part of the bolt 98A is inserted. The cam member 97 has a concave part 97C. The concave part 97C is formed on the outer surface of the cam member 97 facing the direction opposite to the second holding part 96 and is recessed toward the second holding part 96.

[0163] The second holding part 96 has an inner surface 96A facing the first holding part 95, an outer surface 96B facing the direction opposite to the first holding part 95, and an insertion hole 96C through which the shaft part of the bolt 98A passes. The inner surface 96A is an engagement surface with an uneven pattern. A concave bolt holding part 96D for accommodating the head of the bolt 98A is provided on the outer surface 96B. The inner diameter of the bolt holding part 96D is larger than the inner diameter of the insertion hole 96C. The bolt holding part 96D has an inner surface shape corresponding to the tool engagement shape of the head of the bolt 98A and engages with the bolt 98A. Thereby, the bolt 98A is held non-rotatably inside the bolt holding part 96D.

[0164] The tightening mechanism 92 includes a bolt 98A, a nut 98B, a cam member 97, and a tightening knob 99. The bolt 98A straddles the first holding part 95 and the second holding part 96. The bolt 98A passes through the cam member 97 from the outer surface 96B of the second holding part 96 through the insertion hole 96C and the insertion hole 97B. The bolt 98A is held by the second holding part 96 when the head of the bolt 98A is supported by the bottom surface of the bolt holding part 96D of the second holding part 96.

[0165] The tightening knob 99 is disposed in the first holding portion 95. The tightening knob 99 has a gripping portion 99A and a protruding portion 99B that protrudes from the gripping portion 99A toward the cam member 97. The tightening knob 99 has an insertion hole 99C that penetrates the gripping portion 99A and the protruding portion 99B, and a concave nut holding portion 99D formed in the gripping portion 99A. The protruding portion 99B is disposed inside the concave portion 97C of the cam member 97. The tip of the protruding portion 99B contacts the inner bottom surface of the concave portion 97C.

[0166] The tip of the bolt 98A penetrates the insertion hole 99C and reaches inside the nut holding portion 99D. The inner diameter of the nut holding portion 99D is larger than the inner diameter of the insertion hole 99C. The nut holding portion 99D houses the nut 98B. The nut holding portion 99D has an inner surface shape corresponding to the tool engagement shape of the nut 98B and engages with the nut 98B. Thereby, the tightening knob 99 and the nut 98B rotate together. The nut 98B meshes with the threaded portion of the bolt 98A inside the nut holding portion 99D.

[0167] The band 93 is a C-shaped band member. The band 93 is made of metal. A first mounting portion 101 and a second mounting portion 102 are provided at one end and the other end of the band 93, respectively. The first mounting portion 101 and the second mounting portion 102 are made of resin. The first mounting portion 101 and the second mounting portion 102 are annular and the bolt 98A penetrates therethrough. The first mounting portion 101 faces the cam engagement surface 97A of the cam member 97. The first mounting portion 101 has an engagement surface 103 with an uneven pattern and engages with the cam engagement surface 97A. The second mounting portion 102 faces the inner surface 96A of the second holding portion 96. The second mounting portion 102 has an engagement surface 103 with an uneven pattern and engages with the inner surface 96A of the second holding portion 96. Each engagement surface 103 and the cam engagement surface 97A and the inner surface 96A engage with each other in the rotational direction around the central axis BX of the bolt 98A. The relative angle of the band 93 with respect to the handle base 91 in the rotational direction around the central axis BX is fixed by the engagement surface 103.

[0168] The band 93 is held by the handle base 91 by inserting bolts 98A through the first mounting portion 101 and the second mounting portion 102. Since the C-shaped band 93 is connected to the bolts 98A at the portions of the first mounting portion 101 and the second mounting portion 102 at both ends, the band 93 has an annular shape that substantially surrounds the entire circumference of the band mounting portion 70.

[0169] Protrusions 93A and 93B are provided on the inner peripheral surface of the band 93. The protrusions 93A and 93B have a V-shaped convex shape. The protrusion 93A is disposed near the first mounting portion 101 of the band 93. The protrusion 93B is disposed near the second mounting portion 102 of the band 93. The protrusions 93A and 93B engage with the recess 72 of the hammer housing portion 3.

[0170] Specifically, as shown in FIG. 20, a support rib 71 that contacts the inner peripheral surface of the band 93 is formed on the band mounting portion 70 of the hammer housing portion 3. A recess 72 is formed at a predetermined location of the support rib 71. The recess 72 has a concave shape corresponding to the protrusions 93A and 93B. In the embodiment, the recess 72 has a V-shaped concave shape. By engaging the protrusions 93A and 93B with the recess 72, displacement of the band 93 in the rotational direction is suppressed.

[0171] The recesses 72 are provided in a plurality along the circumferential direction on the outer periphery of the hammer housing portion 3. By engaging the protrusions 93A and 93B with any one of the recesses 72, the mounting direction of the side handle 90 can be changed. The side handle 90 can be mounted, for example, in a direction that is 90 degrees or 180 degrees in the rotational direction with respect to the grip portion 22. In the embodiment, the recesses 72 can change the mounting direction at intervals of 45 degrees along the outer periphery of the hammer housing portion 3. When the handle portion 11 of the side handle 90 is mounted at an angle of 90 degrees to the left or right with respect to the grip portion 22, it is arranged in the left or right direction with respect to the hammer housing portion 3. When the handle portion 11 of the side handle 90 is mounted at an angle of 180 degrees with respect to the grip portion 22, it is arranged in the upward direction with respect to the hammer housing portion 3. When the handle portion 11 of the side handle 90 is mounted at an angle of 135 degrees to the left or right with respect to the grip portion 22, it is arranged in the upper left diagonal direction or the upper right diagonal direction with respect to the hammer housing portion 3.

[0172] Note that the protrusions (protrusions 93A and 93B) and the recesses 72 may not be provided. In this case, the rotation direction deviation is suppressed by the friction between the band 93 and the band mounting portion 70 based on the tightening force of the band 93.

[0173] The band 93 has a width W. A pair of locking ribs 73 are formed on the outer peripheral surface of the hammer housing portion 3. The pair of locking ribs 73 are provided one by one on both sides in the front-rear direction of the band mounting portion 70. In other words, a groove-shaped band mounting portion 70 is provided between the pair of locking ribs 73. The interval between the pair of locking ribs 73 is slightly larger than the width W of the band 93. The pair of locking ribs 73 face the band 93 disposed in the band mounting portion 70 in the front-rear direction, respectively. When the band 93 attempts to be displaced in the front-rear direction, the pair of locking ribs 73 come into contact with the end surfaces 93C in the width direction of the band 93. The pair of locking ribs 73 suppress the displacement of the band 93 in the front-rear direction. The pair of locking ribs 73 extend along the circumferential direction of the hammer housing portion 3. The pair of locking ribs 73 are continuous over the entire formation location of the band mounting portion 70 in the hammer housing portion 3.

[0174] When attaching the side handle 90, the operator rotates the tightening knob 99 in the loosening direction to disengage the nut 98B from the bolt 98A and pulls out the bolt 98A. Thereby, the band 93 and the handle base 91 are separated. The operator passes one end of the band 93 inside the annular handle portion 11 of the impact tool 1 and arranges the band 93 so as to surround the periphery of the band mounting portion 70. With the band 93 arranged around the band mounting portion 70, the operator attaches the bolt 98A so as to pass through the second holding portion 96, the second mounting portion 102, the first mounting portion 101, the cam member 97, and the tightening knob 99, and engages it with the nut 98B of the tightening knob 99. By rotating the tightening knob 99 in the tightening direction, the operator moves the nut 98B along the central axis BX of the bolt 98A. As the nut 98B moves, the tightening knob 99 moves in a direction approaching the second holding portion 96. As the tightening knob 99 moves, the cam member 97 approaches the second holding portion 96 along the central axis BX of the bolt 98A. The first mounting portion 101 pushed by the cam member 97 approaches the second holding portion 96 along the central axis BX of the bolt 98A. As a result, the distance between the first mounting portion 101 and the second mounting portion 102 is reduced, so that the inner diameter of the band 93 is reduced. Due to the reduction of the inner diameter of the band 93, the band 93 tightens the hammer housing portion 3 and the connecting portion 25 at the portion of the band mounting portion 70. By the tightening force of the band 93, the side handle 90 is fixed to the impact tool 1. When removing the side handle 90, it is only necessary to rotate the tightening knob 99 in the loosening direction as in the case of attachment and remove the bolt 98A.

[0175] In the embodiment, by bringing the cam member 97 closer to the second holding portion 96 with the tightening knob 99, the distance between the first mounting portion 101 and the second mounting portion 102 of the band 93 is reduced. In addition to this, the distance between the first mounting portion 101 and the second mounting portion 102 of the band 93 may be reduced by bringing the first holding portion 95 of the handle base 91 closer to the second holding portion 96. For example, instead of providing the cam member 97, a structure similar to the cam engagement surface 97A, the insertion hole 97B, and the concave portion 97C is provided in the first holding portion 95, and the first holding portion 95 is pressed by the tightening knob 99 with the tightening force of the bolt 98A. Thereby, the handle base 91 may be elastically deformed to reduce the distance between the first holding portion 95 and the second holding portion 96. Alternatively, a cam member having a structure similar to the cam member 97 provided in the first holding portion 95 may also be provided in the second holding portion 96, and the first mounting portion 101 and the second mounting portion 102 may be sandwiched via the cam members respectively. An elastic body such as a coil spring may be disposed between the tightening knob 99 and the cam member.

[0176] <Usage method> When the trigger lever 14 is operated by an operator, the motor 6 is activated and light is emitted from the light emitter 52 of the light emitter unit 16. The luminous intensity of the light emitted from the light emitter unit 16 is high, and the work object can be brightly illuminated. Even when the side handle 90 is mounted, the light emitter unit 16 is disposed in front of the side handle 90. The light emitted from the light emitter unit 16 is not blocked by the side handle 90.

[0177] On the other hand, when a part of the light emitted from the light emitter 52 diffuses more than necessary, the operator may feel dazzled and it may be difficult to visually recognize the work object. In the embodiment, the light emitted from the outer peripheral surface of the outer cylinder portion 55A of the optical member 55 is blocked by the wall portion 3F. The front surface 16A of the light emitter unit 16 is partially covered by the first protective cover 61 and the second protective cover 62, so that the light emission region is restricted. Thereby, it is suppressed that the operator feels dazzled.

[0178] Also, even if the impact tool 1 drops, for example, the light emitter unit 16 is protected by the wall portion 3F of the hammer housing portion 3. Thereby, breakage of the light emitter unit 16 is suppressed, and deterioration of the light emission performance of the light emitter unit 16 is suppressed.

[0179] Also, as the maximum tightening torque of the impact tool 1 increases, the weight of the hammer housing portion 3 increases in order to increase the inertial force at the time of collision by the hammer. The greater the weight of the hammer housing portion 3, the greater the impact on the handle portion 11 at the time of dropping. In the embodiment, the handle portion 11 below the hammer housing portion 3 has high mechanical strength due to an annular structure composed of a grip portion 22, a support portion 24, a battery holding portion 23, and a connection portion 25. Thereby, even if the impact tool 1 drops, breakage of the handle portion 11 is suppressed.

[0180] The value of the maximum tightening torque of the impact tool 1 is not particularly limited. The maximum tightening torque of the impact tool 1 is, for example, 1800 N·m or more. More specifically, the maximum tightening torque of the impact tool 1 according to the embodiment is 2100 N·m or more and 2300 N·m or less. The maximum tightening torque is the torque when tightening the fastened material, and generally refers to the torque measured by an additional tightening torque wrench or the like with respect to the fastened material after fastening. Note that it is not a method of loosening nuts and bolts and then measuring. Generally, this maximum tightening torque is described in the catalog of each manufacturing manufacturer.

[0181] <Effect> As described above, in the embodiment, the impact tool 1 includes a motor 6, a motor housing portion 21 that houses the motor 6, a grip portion 22 that extends downward from the motor housing portion 21, a hammer 47 that is rotated by the motor 6, an anvil 10 that is struck in the rotational direction by the hammer 47, a hammer housing portion 3 that houses the hammer 47, a support portion 24 that is disposed in front of the grip portion 22 and extends downward from the motor housing portion 21 or the hammer housing portion 3, a battery holding portion 23 that is connected to the grip portion 22 and the support portion 24 and to which a battery pack 80 is detachably attached, and a light emitter unit 16 that is held at the front portion of the hammer housing portion 3 and has a plurality of light emitters 52 in the rotational direction around the anvil 10. A lead wire 60 that is electrically connected to the light emitter unit 16 passes through the inside of the support portion 24.

[0182] In the above configuration, in the impact tool 1 having the support portion 24, since the light emitter unit 16 having a plurality of light emitters 52 in the rotational direction around the anvil 10 is held at the front portion of the hammer housing portion 3, it is possible to appropriately illuminate the periphery of the anvil 10. Further, since the support portion 24 is used as a passage for the lead wire 60, it is not necessary to increase the size of the structure of the impact tool 1 in order to allow the lead wire 60 to pass through. Therefore, an increase in the size of the impact tool 1 due to the wiring for illumination is suppressed. Since the lead wire 60 is disposed in the support portion 24 which is a support structure, the assembly work of disposing the lead wire 60 becomes easier compared to the case where the lead wire 60 is disposed in a space where a large number of components are concentrated. Therefore, a decrease in the assembly work is suppressed.

[0183] In the embodiment, the hammer housing portion 3 has a front surface portion 3C provided with the light emitter unit 16. The support portion 24 is provided so as to extend downward from the front surface portion 3C of the hammer housing portion 3.

[0184] With the above configuration, the light-emitting unit 16 and the support column 24 can be brought closer together. Since the portion for guiding the lead wire 60 between the light-emitting unit 16 and the support column 24 can be made smaller or the portion for guiding the lead wire 60 can be dispensed with, the increase in the size of the impact tool 1 due to the wiring for illumination is suppressed. Further, even when the hammer housing portion 3 becomes large with the large impact tool 1, the impact resistance can be effectively improved by arranging the support column 24 below the front surface portion 3C of the hammer housing portion 3.

[0185] In the embodiment, the hammer housing portion 3 has a wall portion 3F surrounding the outer periphery of the light-emitting unit 16.

[0186] With the above configuration, the wall portion 3F can protect the light-emitting unit 16 from external collisions.

[0187] In the embodiment, the wall portion 3F is at the same position as the front surface of the light-emitting unit 16 or extends forward beyond the front surface of the light-emitting unit 16.

[0188] With the above configuration, since the light-emitting unit 16 does not protrude forward beyond the wall portion 3F, the light-emitting unit 16 can be effectively protected.

[0189] In the embodiment, the light-emitting unit 16 is formed in a circumferential shape so as to surround the anvil 10.

[0190] With the above configuration, light can be irradiated by the light-emitting unit 16 from a wide range around the anvil 10. Illumination of the tip tool attached to the anvil 10 and the work location can be effectively performed.

[0191] In the embodiment, the hammer housing portion 3 has a front cylinder portion 3B in which an anvil bearing 46 for supporting the anvil 10 in the rotational direction is arranged. At least a part of the light-emitting unit 16 is arranged between the outer peripheral surface 3E of the hammer housing portion 3 and the front cylinder portion 3B.

[0192] In the above configuration, the space between the outer peripheral surface 3E of the hammer housing portion 3 and the front cylinder portion 3B can be used as the installation space for the light-emitting unit 16. Therefore, the increase in size of the impact tool 1 is suppressed.

[0193] In the embodiment, the support column portion 24 is disposed directly below the light-emitting unit 16. The light-emitting unit 16 has a convex portion 55D that enters the interior of the support column portion 24.

[0194] In the above configuration, since the convex portion 55D of the light-emitting unit 16 is disposed inside the support column portion 24, the lead wire 60 extending from the light-emitting unit 16 can directly enter the interior of the support column portion 24. Since there is no need to provide a member for guiding between the light-emitting unit 16 and the support column portion 24, the increase in size of the impact tool 1 is suppressed.

[0195] In the embodiment, the battery holding portion 23 has a controller 17 that controls the light-emitting unit 16. The lead wire 60 passes from the upper end portion to the lower end portion of the support column portion 24 and is connected to the controller 17.

[0196] In the above configuration, even when the light-emitting unit 16 is disposed in the hammer housing portion 3, by using the entire support column portion 24 as a passage for the lead wire 60, the wiring structure can be simplified and the number of components can be reduced.

[0197] In the embodiment, the light-emitting unit 16 is disposed so as to cover the front side of the plurality of light emitters 52, and includes an optical member 55 that diffuses the light of the plurality of light emitters 52. The optical member 55 is continuous so as to straddle the plurality of light emitters 52.

[0198] In the above configuration, the optical member 55 can cause the light-emitting unit 16 to emit light in a planar shape rather than a point shape. Since the variation in brightness in the light emission direction is reduced, the illumination around the anvil 10 can be performed more appropriately.

[0199] In an embodiment, the impact tool 1 includes a connection portion 25 that connects the upper end of the grip portion 22 and the upper end of the support portion 24. The grip portion 22, the support portion 24, the battery holding portion 23, and the connection portion 25 constitute an annular handle portion 11.

[0200] In the above configuration, since the grip portion 22, the support portion 24, the battery holding portion 23, and the connection portion 25 support each other by the annular handle portion 11, the impact resistance of the handle portion 11 can be effectively improved.

[0201] In an embodiment, the impact tool 1 includes a motor 6, a motor housing portion 21 that houses the motor 6, a grip portion 22 that extends downward from the motor housing portion 21, a hammer 47 that is rotated by the motor 6, an anvil 10 that is struck in the rotational direction by the hammer 47, a hammer housing portion 3 that houses the hammer 47, a support portion 24 that is disposed in front of the grip portion 22 and extends below the motor housing portion 21 or the hammer housing portion 3, a battery holding portion 23 that is connected to the grip portion 22 and the support portion 24 and to which a battery pack 80 is detachable, a side handle 90 that is detachable from the hammer housing portion, and a light emitting unit 16 that is disposed in front of the side handle 90.

[0202] In the above configuration, since the side handle 90 is detachable from the hammer housing portion 3 that houses the hammer 47, the side handle 90 can be brought closer to the heavy parts (the hammer 47 and the hammer housing portion 3). Therefore, good balance can be ensured in the impact tool 1 having the side handle 90. And since the light emitting unit 16 is disposed in front of the side handle 90, even when the side handle 90 is attached to the hammer housing portion 3, the light from the light emitting unit 16 can reach the periphery of the anvil 10 without being obstructed by the side handle 90. Therefore, the periphery of the anvil 10 can be appropriately illuminated.

[0203] In an embodiment, the hammer housing portion 3 has an annular and concave installation portion 3D that houses the light emitting unit 16.

[0204] In the above configuration, the annular light emitter unit 16 can be compactly installed in the hammer housing portion 3. Therefore, an increase in the size of the impact tool 1 can be suppressed.

[0205] In the embodiment, the impact tool 1 includes a buffer member 57 disposed between the hammer housing portion 3 and the light emitter unit 16. The buffer member 57 covers at least one of the rear surface of the light emitter unit 16 and the inner circumferential surface and the outer circumferential surface 3E of the light emitter unit 16.

[0206] In the above configuration, even when the light emitter unit 16 is installed in the hammer housing portion 3 that vibrates due to impact during the use of the impact tool 1, the buffer member 57 can effectively protect the light emitter unit 16 from vibration.

[0207] In the embodiment, the light emitter unit 16 is held in the hammer housing portion 3 via the buffer member 57 at the installation portion 3D in a non-contact state with the hammer housing portion 3.

[0208] In the above configuration, since the light emitter unit 16 does not directly contact the hammer housing portion 3, it is possible to prevent the occurrence of wear of the light emitter unit 16 due to the vibration of the hammer housing portion 3.

[0209] In the embodiment, the hammer housing portion 3 has a wall portion 3F that constitutes the outer periphery of the installation portion 3D. The wall portion 3F connects the light emitter unit 16 and the inside of the support portion 24 and has a slit 3G through which the lead wire 60 passes.

[0210] In the above configuration, the wall portion 3F can protect the light emitter unit 16 from an external collision. The slit 3G in the wall portion 3F allows the lead wire 60 to easily enter from the light emitter unit 16 into the inside of the support portion 24.

[0211] In the embodiment, the impact tool 1 includes a guide portion GD that guides the lead wire 60 passing through the slit 3G so as not to contact the hammer housing portion 3.

[0212] In the above configuration, the lead wire 60 can be protected from the vibration generated in the hammer housing portion 3 by the guide portion GD.

[0213] In the embodiment, the light emitter unit 16 has a convex portion 55D that enters the inside of the support portion 24 through the slit 3G. The impact tool 1 includes a buffer member 57 disposed between the hammer housing portion 3 and the light emitter unit 16. The guide portion GD is constituted by a passage portion surrounded by the buffer member 57 and the convex portion 55D inside the slit 3G.

[0214] In the above configuration, the light emitter unit 16 can be effectively protected from vibration by the buffer member 57. The guide portion GD can be constituted by using a part (convex portion 55D) of the light emitter unit 16 and the buffer member 57. Therefore, the number of components can be reduced as compared with the case where the guide portion GD is provided separately from the buffer member 57.

[0215] In the embodiment, the impact tool 1 includes an annular first protective cover 61 that covers a wall portion 3F including the slit 3G, an end portion of the support portion 24 adjacent to the slit 3G, and an outer peripheral portion of the front surface 16A of the light emitter unit 16.

[0216] In the above configuration, the impact at the time of collision with an external object when using the impact tool 1 can be mitigated by the first protective cover 61.

[0217] In the embodiment, the hammer housing portion 3 constitutes an inner peripheral surface of the installation portion 3D and has a front cylinder portion 3B that surrounds the anvil 10. The impact tool 1 includes an annular second protective cover 62 that covers the front cylinder portion 3B and an inner peripheral portion of the front surface 16A of the light emitter unit 16.

[0218] In the above configuration, the impact at the time of collision with an external object when using the impact tool 1 can be mitigated by the second protective cover 62. By covering the outer peripheral portion and the inner peripheral portion of the front surface 16A of the light emitter unit 16 with the first protective cover 61 and the second protective cover 62, the light emitter unit 16 can be effectively protected while ensuring the light emission region of the light emitter unit 16.

[0219] In an embodiment, the impact tool 1 includes a motor 6, a motor housing portion 21 that houses the motor 6, a hammer 47 rotated by the motor 6, an anvil 10 struck in a rotational direction by the hammer 47, a hammer housing portion 3 that houses the hammer 47, an annular light emitter unit 16 disposed at the front portion of the hammer housing portion 3 and surrounding the anvil 10, and an annular handle portion 11 disposed below the motor housing portion 21 and the hammer housing portion 3.

[0220] In the above configuration, a part of the annular handle portion 11 can function as a grip portion 22 and another part can function as a support portion 24. Since the annular light emitter unit 16 surrounding the anvil 10 is disposed at the front portion of the hammer housing portion 3, appropriate illumination around the anvil 10 can be performed. Thus, in the impact tool 1 having the support portion 24, appropriate illumination around the anvil 10 can be performed.

[0221] [Other Embodiments] In the above-described embodiment, the installation portion 3D does not have to be annular, and a plurality of them may be provided at intervals around the anvil shaft portion 10C. A chip-shaped light emitter and an optical member may be disposed in each of the plurality of installation portions 3D.

[0222] In the above-described embodiment, the light emitter unit 16 is assumed to have the COB light 50. The light emitter unit 16 may have a light other than the COB light. The light emitter unit 16 may have a plurality of light emitters.

[0223] In the above-described embodiment, the impact tool 1 is assumed to be an impact wrench. The impact tool 1 may be an impact driver. In this case, the impact tool 1 includes an anvil 10 in which a mounting hole for mounting a driver bit as a tip tool is formed.

[0224] In the above-described embodiment, the power source of the impact tool 1 does not have to be the battery pack 80 and may be a commercial power source (alternating current power source).

Explanation of Symbols

[0225] 1... Impact tool, 2... Housing, 2R... Right housing, 2L... Left housing, 2H... Screw boss portion, 2S... Screw, 3... Hammer housing portion, 3A... Rear cylinder portion, 3B... Front cylinder portion, 3C... Front face portion, 3D... Installation portion, 3E... Outer peripheral surface, 3F... Wall portion, 3G... Slit, 3H... Screw boss portion, 3J... Snap ring groove, 3K... Outer peripheral protrusion, 5... Screw, 6... Motor, 7... Reduction mechanism, 8... Spindle, 8A... Flange portion, 8B... Spindle shaft portion, 8C... Rib, 8D... Spindle groove, 8E... Convex portion, 9... Impact mechanism, 10... Anvil, 10B... Concave portion, 10C... Anvil shaft portion, 10D... Anvil protrusion portion, 10E... Groove portion, 11... Handle portion, 12... Fan, 14... Trigger lever, 15... Forward and reverse switching lever, 16... Light emitter unit, 16A... Front face, 17... Controller, 18... Interface panel, 21... Motor housing portion, 21A... Air inlet, 21B... Exhaust port, 21C... Rear plate portion, 21D... Partition wall, 21E... Opening, 22... Grip portion, 23... Battery holding portion, 23A... Engagement concave portion, 23B... Rear holding portion, 23C... Front holding portion, 24... Support pillar portion, 24A... Opening, 24B... Upper end face, 25... Connection portion, 26... 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... Balancer, 37... Sensor board, 38... Gear case, 38A... Cylindrical portion, 38B... Bottom plate portion, 38C... Holding cylinder portion, 38D... Flange portion, 38H... Screw boss portion, 39... Rotor bearing, 40... Rotor bearing, 41... Pinion gear, 42B1... First gear portion, 42B2... Second gear portion, 42P... Pin, 42... Planetary gear, 42A... First planetary gear, 42B... Second planetary gear, 43... Internal gear, 44... Spindle bearing, 45A... Washer, 45B... Ball, 46... Anvil bearing, 46A... Seal member, 47... Hammer, 47A... Hammer groove, 47B... Hammer protrusion portion, 47C... Concave portion, 47D... Body portion, 47E... Rear outer cylinder portion, 47F... Front outer cylinder portion, 47G... Inner cylinder portion, 47H... Ball groove, 48... Ball,  49... Coil spring, 50... COB light, 51... Board, 51A... Annular portion, 51B... Support portion, 52... Light emitter, 53... Phosphor, 55... Optical member, 55A... Outer cylinder portion, 55B... Inner cylinder portion, 55C... Light transmission portion, 55D... Convex portion, 55E... Rib, 56... Snap ring,57... Buffer member, 57A... Bottom plate portion, 57B... Inner peripheral wall portion, 57C... Protrusion, 57D... Recess, 57E... Projection, 60... Lead wire, 61... First protective cover, 62... Second protective cover, 70... Band mounting portion, 71... Support rib, 72... Recess, 73... Locking rib, 80... Battery pack, 81... Release switch, 82... Engaging hook portion, 83... Bottom surface, 84... Finger placement portion, 90... Side handle, 91... Handle base, 91A... Columnar portion, 91B... First arm, 91C... Second arm, 92... Tightening mechanism, 93... Band, 93A... Protrusion, 93B... Protrusion, 93C... End face, 94... Handle grip, 95... First holding portion, 96... Second holding portion, 96A... Inner surface, 96B... Outer surface, 96C... Insertion hole, 96D... Bolt holding portion, 97... Cam member, 97A... Cam engagement surface, 97B... Insertion hole, 97C... Concave portion, 98A... Bolt, 98B... Nut, 99... Tightening knob, 99A... Gripping portion, 99B... Protrusion portion, 99C... Insertion hole, 99D... Nut holding portion, 101... First mounting portion, 102... Second mounting portion, 103... Engagement surface, AX... Rotation axis, BX... Central axis line, D1... Outer diameter, D2... Diameter, D3... Inner diameter, D4... Inner diameter, D5... Outer diameter, D6... Outer diameter, E... Length, GD... Guide portion, IL1... Virtual plane, IL2... Virtual plane, IL3... Virtual plane, L1... Length, L2... Length, L3... Length, L11... Length, L12... Length, L13... Length, W... Width.,

Claims

1. A motor, a motor housing portion for housing the motor, a grip portion extending downward from the motor housing portion, a hammer rotated by the motor, an anvil struck in the rotational direction by the hammer, a hammer housing portion for housing the hammer, a support portion disposed in front of the grip portion and extending downward from the motor housing portion or the hammer housing portion, a battery holding portion connected to the grip portion and the support portion, to which a battery pack is detachable, a light emitter unit held at the front portion of the hammer housing portion and having a plurality of light emitters in the rotational direction around the anvil, and comprising: a lead wire electrically connected to the light emitter unit passes through the inside of the support portion, an impact tool.

2. The hammer housing portion has a front surface portion provided with the light emitter unit, The support portion is provided so as to extend downward from the front surface portion of the hammer housing portion, The impact tool according to claim 1.

3. The hammer housing portion has a wall portion surrounding the outer periphery of the light emitter unit, The impact tool according to claim 1.

4. The wall portion is at the same position as the front surface of the light emitter unit or extends forward beyond the front surface of the light emitter unit, The impact tool according to claim 3.

5. The light emitter unit is formed in a circumferential shape so as to surround the anvil, The impact tool according to claim 1.

6. The hammer housing portion has a front cylinder portion in which an anvil bearing for supporting the anvil in the rotational direction is disposed, At least a part of the light emitter unit is disposed between the outer peripheral surface of the hammer housing portion and the front cylinder portion, The impact tool according to claim 5.

7. The support portion is disposed directly below the light emitter unit, The light emitter unit has a convex portion entering the inside of the support portion, The impact tool according to claim 1.

8. The battery holding portion has a controller for controlling the light emitter unit, The lead wire passes from the upper end portion to the lower end portion of the support portion and is connected to the controller, The impact tool according to claim 1.

9. The light emitter unit is disposed so as to cover the front side of the plurality of light emitters and includes an optical member for diffusing the light of the plurality of light emitters, The optical member is continuous so as to straddle the plurality of light emitters, The impact tool according to claim 1.

10. Further provided is a connecting portion that connects the upper end of the grip portion and the upper end of the support portion. The grip portion, the support portion, the battery holding portion, and the connecting portion constitute an annular handle portion. The impact tool according to claim 1.

11. A motor, A motor housing portion that houses the motor, A grip portion that extends downward from the motor housing portion, A hammer rotated by the motor, An anvil struck in the rotational direction by the hammer, A hammer housing portion that houses the hammer, A support portion disposed in front of the grip portion and extending below the motor housing portion or the hammer housing portion, A battery holding portion connected to the grip portion and the support portion, to which a battery pack is detachable, A side handle detachable from the hammer housing portion, A light-emitting unit disposed in front of the side handle, comprising: An impact tool.

12. The hammer housing portion has an annular and concave installation portion that houses the light-emitting unit. The impact tool according to claim 11.

13. Further provided is a buffer member disposed between the hammer housing portion and the light-emitting unit, The buffer member covers the rear surface of the light-emitting unit and at least one of the inner peripheral surface and the outer peripheral surface of the light-emitting unit. The impact tool according to claim 12.

14. The light-emitting unit is held by the hammer housing portion via the buffer member in the installation portion in a non-contact state with the hammer housing portion. The impact tool according to claim 13.

15. The hammer housing portion has a wall portion that constitutes the outer periphery of the installation portion, The wall portion connects the light-emitting unit and the inside of the support portion and has a slit through which a lead wire passes. The impact tool according to claim 12.

16. Further provided is a guide portion that guides the lead wire passing through the slit so as not to contact the hammer housing portion. The impact tool according to claim 15.

17. The light-emitting unit has a convex portion that enters the inside of the support portion through the slit, Further provided is a buffer member disposed between the hammer housing portion and the light-emitting unit, The guide portion is constituted by a passage portion surrounded by the buffer member and the convex portion inside the slit. The impact tool according to claim 16.

18. Further comprising an annular first protective cover that covers the wall portion including the slit, an end portion of the support portion adjacent to the slit, and an outer peripheral portion of the front surface of the light-emitting unit. The impact tool according to claim 15.

19. The hammer housing portion constitutes an inner peripheral surface of the installation portion and has a front cylinder portion that surrounds the anvil. Further comprising an annular second protective cover that covers the front cylinder portion and an inner peripheral portion of the front surface of the light-emitting unit. The impact tool according to claim 18.

20. A motor, A motor housing portion that houses the motor, A hammer rotated by the motor, An anvil struck in the rotational direction by the hammer, A hammer housing portion that houses the hammer, An annular light-emitting unit disposed at a front portion of the hammer housing portion and surrounding the anvil, And an annular handle portion disposed below the motor housing portion and the hammer housing portion. An impact tool.

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