Impact tool

Abstract

The invention provides an impact tool which can appropriately illuminate the periphery of an anvil. The impact tool includes: a motor; a motor accommodating part for accommodating the motor; a grip portion extending downward from the motor housing portion; a hammer that is rotated by the motor; an anvil which is struck in the rotational direction by the hammer; a hammer accommodating part for accommodating the hammer; a pillar portion disposed at a front position of the grip portion and extending toward a lower portion of the motor housing portion or the hammer housing portion; a battery holding part which is connected to the grip part and the pillar part and to which the battery pack can be attached and detached; and a light emitting body unit which is held at the front part of the hammer accommodating part and is provided with a plurality of light emitting bodies in the rotation direction of the periphery of the anvil. A wire electrically connected to the light-emitting body unit passes through the inside of the pillar portion.

Description

Technical Field

[0001] The technology disclosed by the present invention relates to an impact tool. Background Art

[0002] In an impact tool having a strut portion, there is only a single lamp. Since the impact tool is large, it is impossible to properly irradiate the periphery of the anvil with the lamp. In an impact tool having a strut portion and a side handle, there is only a single lamp. Since the impact tool is large, it is impossible to properly irradiate the periphery of the anvil with the lamp. In addition, in an impact tool having a side handle, although there are multiple lamps, the handle is located behind the motor, so the balance is poor.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-112816 Summary of the Invention

[0006] The object of the technology disclosed in this specification is to be able to properly illuminate the periphery of the anvil in an impact tool having a strut portion. In addition, the object of the technology disclosed in this specification is to be able to ensure good balance in an impact tool having a side handle.

[0007] 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 rotates by the motor; an anvil that is struck in the rotational direction by the hammer; a hammer housing that houses the hammer; a strut portion that is disposed in front of the grip portion and extends downward toward the motor housing or the hammer housing; a battery holder that is connected to the grip portion and the strut portion, and a battery pack can be detached and attached relative to the battery holder; and a light-emitting unit that is held at the front of the hammer housing and has a plurality of light-emitting bodies in the rotational direction around the anvil. A wire electrically connected to the light-emitting unit may pass through the inside of the strut portion.

[0008] Advantages of the Invention

[0009] According to the above configuration, it is possible to properly illuminate the periphery of the anvil. Brief Description of the Drawings

[0010] Figure 1 It is a perspective view showing the impact tool according to the embodiment as viewed from the front.

[0011] Figure 2It is a perspective view showing the impact tool according to the embodiment as viewed from the rear.

[0012] Figure 3 It is a side view showing the impact tool according to the embodiment as viewed from the right.

[0013] Figure 4 It is a longitudinal sectional view showing the impact tool according to the embodiment.

[0014] Figure 5 It is an exploded perspective view showing the housing according to the embodiment.

[0015] Figure 6 It is a longitudinal sectional view showing the upper part of the impact tool according to the embodiment.

[0016] Figure 7 It is a perspective view showing the speed reduction mechanism according to the embodiment.

[0017] Figure 8 It is a transverse sectional view showing the striking mechanism according to the embodiment.

[0018] Figure 9 It is a longitudinal sectional view showing the upper part of the impact tool according to the embodiment.

[0019] Figure 10 It is an exploded perspective view showing the light emitting unit according to the embodiment.

[0020] Figure 11 It is an exploded perspective view showing the light emitting unit according to the embodiment as viewed from the rear.

[0021] Figure 12 It is an exploded perspective view showing the light emitting unit and the installation part according to the embodiment.

[0022] Figure 13 It is a view showing the light emitting unit arranged in the installation part as viewed from the front.

[0023] Figure 14 It is a perspective view showing the opening of the support part according to the embodiment.

[0024] Figure 15 It is a view showing the slit of the hammer housing part according to the embodiment as viewed from below.

[0025] Figure 16 It is a longitudinal sectional view showing the enlarged lower part of the impact tool according to the embodiment.

[0026] Figure 17 It is a longitudinal sectional view showing the enlarged motor housing part of the impact tool according to the embodiment.

[0027] Figure 18 It is a perspective view showing the side handle related to the embodiment.

[0028] Figure 19 It is a cross-sectional view of the cross-section passing through the assembly part of the side handle related to the embodiment as observed from the front.

[0029] Figure 20 It is a perspective view showing the strap assembly part related to the embodiment.

[0030] Explanation of reference numerals

[0031] 1... Impact tool; 2... Housing; 2R... Right housing; 2L... Left housing; 2H... Threaded boss portion; 2S... Screw; 3... Hammer receiving portion; 3A... Rear cylinder portion; 3B... Front cylinder portion; 3C... Front surface portion; 3D... Setting portion; 3E... Outer peripheral surface; 3F... Wall portion; 3G... Slit; 3H... Threaded 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... Protrusion; 9... Striking mechanism; 10... Anvil; 10B... Recess; 10C... Anvil shaft portion; 10D... Anvil protrusion portion; 10E... Groove portion; 11... Handle portion; 12... Fan; 14... Trigger shift; 15... Forward and reverse switching shift; 16... Light emitting unit; 16A... Front surface; 17... Controller; 18... Interface panel; 21... Motor receiving portion; 21A... Air inlet; 21B... Exhaust port; 21C... Rear plate portion; 21D... Partition wall; 21E... Opening; 22... Gripping portion; 23... Battery holding portion; 23A... Engaging recess; 23B... Rear holding portion; 23C... Front holding portion; 24... Strut portion; 24A... Opening; 24B... Upper end surface; 25... Connecting 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... Balancing member; 37... Sensor substrate; 38... Gear box; 38A... Cylinder portion; 38B... Bottom plate portion; 38C... Holding cylinder portion; 38D... Flange portion; 38H... Threaded boss portion; 39... Rotor bearing; 40... Rotor bearing; 41... Pinion; 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... Sealing member; 47... Hammer; 47A... Hammer groove; 47B... Hammer protrusion portion; 47C... Recess; 47D... Main body portion; 47E... Rear outer cylinder portion; 47F... Front outer cylinder portion; 47G... Inner cylinder portion; 47H... Ball groove; 48... Ball; 49... Helical spring; 50... COB lamp; 51... Substrate; 51A... Ring portion; 51B... Support portion; 52... Light emitting body; 53... Phosphor; 55... Optical component; 55A... Outer cylinder portion; 55B... Inner cylinder portion; 55C... Light transmissive portion; 55D... Protrusion; 55E... Rib; 56... Snap ring; 57... Buffer member; 57A... Bottom plate portion; 57B... Inner peripheral wall portion; 57C... Protrusion portion; 57D... Recess; 57E... Protrusion; 60... Wire; 61... First protective cover; 62... Second protective cover; 70... Strap assembly portion; 71... Support rib; 72... Recess; 73... Locking rib; 80... Battery pack; 81... Release switch; 82... Engaging hook portion; 83... Lower surface; 84... Finger placement portion; 90... Side handle;91…Handle base; 91A…Columnar part; 91B…First arm; 91C…Second arm; 92…Fastening mechanism; 93…Strap; 93A…Projection; 93B…Projection; 93C…End face; 94…Handle grip part; 95…First holding part; 96…Second holding part; 96A…Inner surface; 96B…Outer surface; 96C…Insertion through-hole; 96D…Bolt holding part; 97…Cam member; 97A…Cam engagement surface; 97B…Insertion through-hole; 97C…Concave part; 98A…Bolt; 98B…Nut; 99…Fastening knob; 99A…Grip part; 99B…Projection part; 99C…Insertion through-hole; 99D…Nut holding part; 101…First assembly part; 102…Second assembly part; 103…Engagement surface; AX…Rotation axis; BX…Central axis; D1…Outer diameter; D2…Diameter; D3…Inner diameter; D4…Inner diameter; D5…Outer diameter; D6…Outer diameter; E…Length; GD…Guide part; IL1…Imaginary plane; IL2…Imaginary plane; IL3…Imaginary plane; L1…Length; L2…Length; L3…Length; L11…Length; L12…Length; L13…Length; W…Width.; Detailed implementation mode

[0032] 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 rotates by the motor; an anvil that is struck in the 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 toward the motor housing or the hammer housing; a battery holder that is connected to the grip portion and the support portion, and the battery pack can be detached and attached relative to the battery holder; and a light emitting unit that is held at the front of the hammer housing and has a plurality of light emitters in the rotational direction around the anvil. A wire electrically connected to the light emitting unit may pass through the inside of the support portion.

[0033] According to the above configuration, in the impact tool having the support portion, the light emitting unit having a plurality of light emitters in the rotational direction around the anvil is held at: the front of the hammer housing, so that the illumination of the periphery of the anvil can be appropriately performed. In addition, the support portion is used as a path for the wire, so there is no need to increase the size of the structure of the impact tool in order to allow the wire to pass through. Accordingly, it is possible to suppress: the increase in size of the impact tool caused by the wiring for illumination.

[0034] In one or more embodiments, the hammer housing may have: a front surface portion provided with the light emitting unit. The support portion may be provided to: extend downward from the front surface portion of the hammer housing.

[0035] According to the above configuration, the light-emitting unit can be brought closer to the support column portion. The portion for guiding the wire between the light-emitting unit and the support column portion can be reduced, or the portion for guiding the wire can be omitted. Therefore, it is possible to suppress the increase in size of the impact tool caused by the lighting wiring. In addition, even when the hammer housing portion becomes larger in a large impact tool, by disposing the support column portion at a position below the front surface portion of the hammer housing portion, the impact resistance can be effectively improved.

[0036] In one or more embodiments, the hammer housing portion may have a wall portion that surrounds the outer periphery of the light-emitting unit.

[0037] According to the above configuration, the light-emitting unit can be protected by the wall portion from external collisions.

[0038] In one or more embodiments, the wall portion may extend to the same position as the front surface of the light-emitting unit, or to a position further forward than the front surface of the light-emitting unit.

[0039] According to the above configuration, the light-emitting unit does not protrude further forward than the wall portion, so the light-emitting unit can be effectively protected.

[0040] In one or more embodiments, the light-emitting unit may be formed in a surrounding shape so as to surround the anvil. In addition, the surrounding shape means that along the circumferential direction, it is not limited to the case of surrounding the entire circumference of the anvil, and may also surround only a part of the periphery of the anvil.

[0041] According to the above configuration, light can be irradiated by the light-emitting unit from a relatively large range around the anvil. It is possible to effectively perform lighting of the front-end tool or the working portion assembled to the anvil.

[0042] In one or more embodiments, the hammer housing portion may have a front cylindrical portion for arranging the anvil bearing that supports the anvil in the rotational direction. At least a part of the light-emitting unit may be arranged at a position between the outer peripheral surface of the hammer housing portion and the front cylindrical portion.

[0043] According to the above configuration, the space between the outer peripheral surface of the hammer housing portion and the front cylindrical portion can be used as the installation space for the light-emitting unit. Thereby, an increase in size of the impact tool can be suppressed.

[0044] In one or more embodiments, the support column 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 column portion.

[0045] According to the above configuration, the convex portion of the light-emitting unit is disposed inside the support portion. Therefore, the wire extending from the light-emitting unit can directly enter the inside of the support portion. There is no need to separately provide a component for guiding between the light-emitting unit and the support portion, so the size increase of the impact tool can be suppressed.

[0046] In one or more embodiments, the battery holding portion may include: a controller that controls the light-emitting unit. The wire may pass from the upper end portion to the lower end portion of the support portion and be connected to the controller.

[0047] According to the above configuration, even when the light-emitting unit is disposed in the hammer housing portion, by using the entire support portion as a path for the wire, the wiring structure can be simplified and the number of components can be reduced.

[0048] In one or more embodiments, the light-emitting unit may include: an optical component configured to cover the front sides of a plurality of light emitters and diffuse the light of the plurality of light emitters. The optical component may be continuous across the plurality of light emitters.

[0049] According to the above configuration, the light-emitting unit can emit light in a planar shape rather than a point shape through the optical component. The deviation of light and dark in the light emission direction can be reduced, so the illumination around the anvil can be more appropriately performed.

[0050] In one or more embodiments, the impact tool may further include: a connecting portion that connects the upper end of the grip portion to the upper end of the support portion. A ring-shaped handle portion may be formed by the grip portion, the support portion, the battery holding portion, and the connecting portion.

[0051] According to the above configuration, the grip portion, the support portion, the battery holding portion, and the connecting portion support each other through the ring-shaped handle portion, so the impact resistance of the handle portion can be effectively improved.

[0052] In one or more embodiments, the impact tool may include: a motor; a motor housing portion that houses the motor; a grip portion that extends downward from the motor housing portion; a hammer that rotates by the motor; an anvil that is struck in the rotational direction by the hammer; a hammer housing portion that houses the hammer; a support portion that is disposed in front of the grip portion and extends downward toward the motor housing portion or the hammer housing portion; a battery holding portion that is connected to the grip portion and the support portion and to which a battery pack can be detachably attached; a side handle that can be detachably attached to the hammer housing portion; and a light-emitting unit that is disposed in front of the side handle.

[0053] According to the above configuration, the side handle can be detached and attached relative to the hammer housing portion that houses the hammer. Therefore, the side handle can be brought closer to the heavy components (the hammer and the hammer housing portion). Accordingly, in an impact tool having a side handle, good balance can be ensured. Moreover, a light-emitting unit is disposed in front of the side handle. Therefore, even when the side handle is assembled to the hammer housing portion, the light from the light-emitting unit is not obstructed by the side handle, and thus the light can be transmitted to the periphery of the anvil. Accordingly, the periphery of the anvil can be appropriately illuminated.

[0054] In one or more embodiments, the hammer housing portion may have an annular and concave setting portion that houses the light-emitting unit.

[0055] According to the above configuration, the annular light-emitting unit can be compactly disposed in the hammer housing portion. Accordingly, an increase in the size of the impact tool can be suppressed.

[0056] In one or more embodiments, the impact tool may further include a buffer member disposed at a position between the hammer housing portion and the light-emitting unit. The buffer member may cover at least one of the rear surface of the light-emitting unit, the inner peripheral surface, and the outer peripheral surface of the light-emitting unit.

[0057] According to the above configuration, even when the light-emitting unit is disposed in the hammer housing portion that vibrates due to impact during use of the impact tool, the buffer member can effectively protect the light-emitting unit from the vibration.

[0058] In one or more embodiments, the light-emitting unit may be held in the hammer housing portion via the buffer member at the setting portion in a state of not being in contact with the hammer housing portion.

[0059] According to the above configuration, since the light-emitting unit is not in direct contact with the hammer housing portion, occurrence of wear and the like of the light-emitting unit caused by the vibration of the hammer housing portion can be prevented.

[0060] In one or more embodiments, the hammer housing portion may have a wall portion that forms the outer periphery of the setting portion. The wall portion may have a slit that connects the light-emitting unit to the inside of the support portion and allows a wire to pass through.

[0061] According to the above configuration, the light-emitting unit can be protected from external collision by the wall portion. The wire can easily enter the inside of the support portion from the light-emitting unit through the slit of the wall portion.

[0062] In one or more embodiments, the impact tool may further include a guiding portion that guides the wire passing through the slit so as not to contact the hammer housing portion.

[0063] According to the above configuration, the guiding portion can protect the wire from the vibration generated on the hammer housing portion.

[0064] In one or more embodiments, the light emitting unit may have a convex portion that passes through the slit and enters the inside of the pillar portion. The impact tool may further include a buffer member disposed at a position between the hammer housing portion and the light emitting unit. The guiding portion may be formed by a passage portion surrounded by the buffer member and the convex portion inside the slit.

[0065] According to the above configuration, the buffer member can effectively protect the light emitting unit from vibration. The guiding portion can be formed by using a part (convex portion) of the light emitting unit and the buffer member. Accordingly, the number of components can be reduced compared with the case where the guiding portion is provided independently of the buffer member.

[0066] In one or more embodiments, the impact tool may further include an annular first protective cover that covers the wall portion including the slit, the end portion of the pillar portion adjacent to the slit, and the outer peripheral portion of the front surface of the light emitting unit.

[0067] According to the above configuration, the first protective cover can mitigate the impact when the impact tool collides with an external object during use.

[0068] In one or more embodiments, the hammer housing portion may have a front cylindrical portion that forms the inner peripheral surface of the setting portion and surrounds the anvil. The impact tool may further include an annular second protective cover that covers the front cylindrical portion and the inner peripheral portion of the front surface of the light emitting unit.

[0069] According to the above configuration, the second protective cover can mitigate the impact when the impact tool collides with an external object during use. By using the first protective cover and the second protective cover to cover the outer peripheral portion and the inner peripheral portion of the front surface of the light emitting unit, the light emission area of the light emitting unit can be ensured, and the light emitting unit can be effectively protected.

[0070] In one or more embodiments, the impact tool may include: a motor; a motor housing that houses the motor; a hammer that rotates by the motor; an anvil that is struck in the rotational direction by the hammer; a hammer housing that houses the hammer; an annular light-emitting unit that is disposed at the front of the hammer housing and surrounds the anvil; and an annular handle portion that is disposed below the motor housing and the hammer housing.

[0071] According to the above configuration, a part of the annular handle portion can function as a gripping portion, and another part of the annular handle portion can function as a support portion. Since the annular light-emitting unit that surrounds the anvil is disposed at the front of the hammer housing, illumination of the periphery of the anvil can be appropriately performed. Thus, in the impact tool having the support portion, illumination of the periphery of the anvil can be appropriately performed.

[0072] Hereinafter, embodiments will be described with reference to the drawings. In the embodiments, terms such as front, rear, left, right, up, and down are used to describe the positional relationship of each part. The above terms indicate: relative positions or directions based on the center of the impact tool.

[0073] Figure 1 FIG. 10 is a perspective view showing the impact tool 1 according to the embodiment as viewed from the front. Figure 2 FIG. 12 is a perspective view showing the impact tool 1 according to the embodiment as viewed from the rear. Figure 3 FIG. 14 is a side view showing the impact tool 1 according to the embodiment as viewed from the right. Figure 4 FIG. 16 is a longitudinal sectional view of the impact tool 1 according to the embodiment. Figure 5 FIG. 18 is an exploded perspective view of the housing 2 according to the embodiment. Figure 6 FIG. 20 is a longitudinal sectional view of the upper part of the impact tool 1 according to the embodiment.

[0074] In the embodiment, the impact tool 1 is a power tool having an electric motor 6 as a power source. The direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as: the axial direction, the direction around the periphery of the rotation axis AX is appropriately referred to as: the circumferential direction or the rotational direction, and the radial direction of the rotation axis AX is appropriately referred to as: the radial direction. Further, in the radial direction, the position closer to the rotation axis AX or the direction approaching the rotation axis AX is appropriately referred to as: the radial inner side or the inner circumferential side, and the position farther from the rotation axis AX or the direction away from the rotation axis AX is appropriately referred to as: the radial outer side or the outer circumferential side. In the embodiment, the rotation axis AX extends along 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).

[0075] 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 reduction mechanism 7, a main shaft 8, a striking mechanism 9, an anvil 10, a handle portion 11, a fan 12, a trigger switch 14, a forward / reverse switching switch 15, and a light-emitting unit 16.

[0076] 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 at a position 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 half-divided housings.

[0077] 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 connecting portion 25.

[0078] The motor housing portion 21 is cylindrical. The motor housing portion 21 has: a bottomed cylindrical shape with an open front and a closed rear. The motor housing portion 21 houses the motor 6. The motor housing portion 21 houses the fan 12 and a part of the gearbox 38. A threaded boss portion 2H is provided in the motor housing portion 21.

[0079] The grip portion 22 extends downward from the motor housing portion 21. The grip portion 22 is provided to straddle the motor housing portion 21 and the hammer housing portion 3 in the front-rear direction. The trigger switch 14 is provided on the upper part of the grip portion 22. The grip portion 22 is held by an operator.

[0080] The support portion 24 is disposed at a position 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 becomes a space for arranging the fingers holding the grip portion 22. The support portion 24 extends downward toward the motor housing portion 21 or the hammer housing portion 3. In the embodiment, the support portion 24 extends downward toward the hammer housing portion 3. Specifically, the support portion 24 is provided 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-emitting unit 16. In the front-rear direction, the position of the light-emitting unit 16 coincides with the position of at least a part of the support portion 24. The support portion 24 may extend downward toward 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 wire 60 electrically connected to the light-emitting unit 16 passes through the inside of the support portion 24. In addition, in each figure, for convenience, the wire 60 is represented by a dashed line.

[0081] The battery holding part 23 is connected to the gripping part 22 and the support part 24. The battery holding part 23 is connected to the lower end part of the gripping part 22. The battery holding part 23 is connected to the lower end part of the support part 24. In the front-back direction and the left-right direction respectively, the outer dimension of the battery holding part 23 is larger than that of the gripping part 22. The battery holding part 23 extends forward from directly below the gripping part 22. The battery holding part 23 is connected to the lower end part of the support part 24 at the front end part. The battery pack 80 can be disassembled and assembled relative to the battery holding part 23.

[0082] As Figure 4 and Figure 5 shown, the connecting part 25 is connected to the gripping part 22 and the support part 24. The connecting part 25 connects the upper end of the gripping part 22 and the upper end of the support part 24. The connecting part 25 extends along the front-back direction. The connecting part 25 is along the outer peripheral surface of the hammer housing part 3.

[0083] The handle part 11 is disposed at a position below the motor housing part 21 and the hammer housing part 3. The handle part 11 is composed of the gripping part 22, the battery holding part 23, the support part 24, and the connecting part 25. The handle part 11 has an annular shape through the gripping part 22, the battery holding part 23, the support part 24, and the connecting part 25. The handle part 11 extends along the up-down direction and the front-back direction. The gripping part 22 constitutes the rear edge of the handle part 11. The support part 24 constitutes the front edge of the handle part 11. The battery holding part 23 constitutes the lower edge of the handle part 11. The connecting part 25 constitutes the upper edge of the handle part 11. As Figure 3 shown, when viewed from the left-right direction, the handle part 11 has a substantially D-shaped annular shape. Each part constituting the handle part 11 is integrally formed on the housing 2.

[0084] The motor housing part 21 has an air inlet 21A. The motor housing part 21 has an air outlet 21B. The air in the external space of the housing 2 flows into the internal space of the housing 2 through the air inlet 21A. The air in the internal space of the housing 2 flows out to the external space of the housing 2 through the air outlet 21B.

[0085] The gearbox 38 is connected to the front part of the motor housing part 21. The gearbox 38 houses the reduction mechanism 7. As Figure 6As shown, the gearbox 38 houses the rotor bearing 40 and the main shaft bearing 44. The gearbox 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 substantially 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 at an inner position of 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 main shaft 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 inside the cylindrical portion 38A and in front of the holding cylindrical portion 38C. The flange portion 38D extends radially outward from the front end portion of the cylindrical portion 38A. A threaded boss portion 38H (see Figure 7 ) is provided on the flange portion 38D. The gearbox 38 is made of metal. In the embodiment, the gearbox 38 is made of aluminum.

[0086] The hammer housing portion 3 houses the main shaft 8. The hammer housing portion 3 houses the hammer 47. The hammer housing portion 3 houses the striking mechanism 9 including the hammer 47. The hammer housing portion 3 houses a part of the anvil 10. The hammer housing portion 3 is made of metal. In the embodiment, the hammer housing portion 3 is made of aluminum. The hammer housing portion 3 is cylindrical. In the embodiment, the hammer housing portion 3 is cylindrical.

[0087] The hammer housing portion 3 includes: a rear cylindrical portion 3A, a front cylindrical portion 3B, a front surface portion 3C, and a threaded boss portion 3H. The front cylindrical portion 3B is disposed at a position more forward than the rear cylindrical portion 3A. The outer diameter of the rear cylindrical portion 3A is larger than the outer diameter of the front cylindrical portion 3B. The inner diameter of the rear cylindrical portion 3A is larger than the inner diameter of the front cylindrical 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 cylindrical portion 3A. The front surface portion 3C is configured to connect the front end portion of the rear cylindrical portion 3A and the rear end portion of the front cylindrical portion 3B. The front surface portion 3C is annular. The front cylindrical portion 3B is configured to protrude forward from the front surface portion 3C.

[0088] The hammer housing portion 3 is connected to the front portion of the gear box 38. The motor housing portion 21 and the gear box 38 are fixed to the rear portion of the hammer housing portion 3 by screws 5. After the screws 5 are sequentially inserted into the opening provided in the threaded boss portion 2H and the opening provided in the threaded boss portion 38H from the rear of the threaded boss portion 2H, they are further inserted into the threaded hole provided in the threaded boss portion 3H. Four threaded boss portions 2H, 38H, and 3H are provided in the circumferential direction respectively. Four screws 5 are provided in the circumferential direction. The hammer housing portion 3, the gear box 38, and the motor housing portion 21 are fixed to each other by the screws 5.

[0089] At least a part of the rear portion of the gear box 38 is housed in the motor housing portion 21. At least a part of the front portion of the gear box 38 is housed in the hammer housing portion 3. The hammer housing portion 3 is fixed to the housing 2 in the front-rear direction by 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 surface of the grip portion 22, the upper surface of the support portion 24, and the upper surface of the connecting portion 25.

[0090] 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 at: an inner position of the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates about a rotation axis AX extending in the front-rear direction.

[0091] The stator 26 has: a stator core 28, a front insulator 29, a rear insulator 30, and a coil 31.

[0092] The stator core 28 is disposed at: a position more radially outward than the rotor 27. The stator core 28 includes: a plurality of steel plates laminated. The steel plate is: a plate made of a metal mainly composed of iron. The stator core 28 is cylindrical. The stator core 28 has: a plurality of teeth for supporting the coil 31.

[0093] 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. The front insulator 29 and the rear insulator 30 are respectively: electrically insulating members made of synthetic resin. The front insulator 29 is configured to: cover a part of the surface of the teeth. The rear insulator 30 is configured to: cover a part of the surface of the teeth.

[0094] The coil 31 is assembled to the stator core 28 by means of 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 by means of 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.

[0095] The rotor 27 rotates about the rotation axis AX. The rotor 27 has: a rotor core portion 32, a rotor shaft portion 33, and a rotor magnet 34.

[0096] The rotor core portion 32 and the rotor shaft portion 33 are each made of steel. In the embodiment, the rotor core portion 32 and the rotor shaft portion 33 are integral. The front portion of the rotor shaft portion 33 projects forward from the front end surface of the rotor core portion 32. The rear portion of the rotor shaft portion 33 projects rearward from the rear end surface of the rotor core portion 32.

[0097] The rotor magnet 34 is fixed to the rotor core portion 32. The rotor magnet 34 is in a flat plate shape. The rotor magnet 34 is arranged inside the rotor core portion 32.

[0098] A balance weight 35 is provided on the rotor shaft portion 33. The balance weight 35 is a metal weight such as brass and is provided to adjust the weight balance of the rotor 27.

[0099] A sensor substrate 37 is mounted on the rear insulator 30. The sensor substrate 37 has: an annular circuit board, and a magnetic sensor supported by the circuit board. The magnetic sensor detects the position of the rotor 27 in the rotation direction by detecting the position of the rotor magnet 34.

[0100] 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 box 38. The front end portion of the rotor shaft portion 33 passes through the holding cylinder portion 38C of the gear box 38 and is connected to the reduction mechanism 7.

[0101] A pinion 41 is formed at the front end portion of the rotor shaft portion 33. The pinion 41 is connected to at least a part of the reduction mechanism 7. The rotor shaft portion 33 is connected to the reduction mechanism 7 by means of the pinion 41.

[0102] The speed reduction mechanism 7 transmits the rotational force of the motor 6 to the main shaft 8 and the anvil 10. The speed reduction mechanism 7 is housed in the gear box 38. The speed reduction mechanism 7 has a plurality of gears. The speed reduction mechanism 7 is arranged at a position more forward than the motor 6. The speed reduction mechanism 7 connects the rotor shaft portion 33 and the main shaft 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 main shaft 8. The speed reduction mechanism 7 rotates the main shaft 8 at a rotational speed lower than that of the rotor shaft portion 33. The speed reduction mechanism 7 includes a planetary gear mechanism.

[0103] Figure 7 FIG. 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 arranged around the pinion 41, and an internal gear 43 arranged around the plurality of planetary gears 42. The pinion 41, the planetary gears 42, and the internal gear 43 are respectively housed in the gear box 38. The plurality of planetary gears 42 include: a first planetary gear 42A and a second planetary gear 42B. The first planetary gear 42A meshes with the pinion 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 positions in the axial direction. 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 box 38. The internal gear 43 cannot always rotate relative to the gear box 38. Each planetary gear 42 (the first planetary gear 42A, the second planetary gear 42B) is supported by the main shaft 8 via a pin 42P so as to be rotatable. The main shaft 8 rotates through the planetary gears 42.

[0104] When the rotor shaft portion 33 rotates by the drive of the motor 6, the pinion 41 rotates, so that the first planetary gear 42A and the second planetary gear 42B revolve around the pinion 41. The second planetary gear 42B revolves while meshing with the internal teeth of the internal gear 43. Through the revolution of each planetary gear 42, the main shaft 8 connected to each planetary gear 42 via the pin 42P rotates at a rotational speed lower than that of the rotor shaft portion 33.

[0105] As Figure 6As shown, the main shaft 8 rotates by the rotational force of the motor 6. The main shaft 8 is disposed at a position more forward than at least a part of the motor 6. The main shaft 8 is disposed at a position more forward than the stator 26. At least a part of the main shaft 8 is disposed at a position more forward than the rotor 27. At least a part of the main shaft 8 is disposed at a position in front of the speed reduction mechanism 7. The main shaft 8 rotates by the rotor 27. The main shaft 8 rotates by the rotational force of the rotor 27 transmitted by the speed reduction mechanism 7.

[0106] The main shaft 8 has a flange portion 8A and a main shaft portion 8B protruding forward from the flange portion 8A. The planetary gear 42 is rotatably supported by the flange portion 8A via a pin 42P. The rotation axis of the main shaft 8 coincides with the rotation axis AX of the motor 6. The main shaft 8 rotates about the rotation axis AX.

[0107] The main shaft 8 is rotatably supported by a main shaft bearing 44. The main shaft 8 has an arcuate rib 8C protruding rearward from the rear portion of the flange portion 8A. The main shaft bearing 44 is disposed at an outer position of the rib 8C. In the embodiment, the inner ring of the main shaft bearing 44 is connected to the rib 8C, and the outer ring of the main shaft bearing 44 is supported by the gear case 38.

[0108] The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the speed reduction mechanism 7 and the main shaft 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the main shaft 8 rotated by the motor 6. The striking mechanism 9 has a hammer 47, a ball 48, and a helical spring 49. The striking mechanism 9 including the hammer 47 is housed in the hammer housing portion 3.

[0109] Figure 8 is a transverse cross-sectional view showing the striking mechanism 9 according to the embodiment. As Figure 6 and Figure 8 shown, the hammer 47 is disposed at a position more forward than the speed reduction mechanism 7. The hammer 47 is housed in the rear cylinder portion 3A. The hammer 47 is disposed around the main shaft portion 8B. The hammer 47 is held by the main shaft portion 8B. The ball 48 is disposed at a position between the main shaft portion 8B and the hammer 47. The helical springs 49 are respectively supported by the flange portion 8A and the hammer 47.

[0110] The hammer 47 has: an annular main body portion 47D, a rear outer cylinder portion 47E protruding rearward from the outer peripheral portion of the main body portion 47D, a front outer cylinder portion 47F protruding forward from the outer peripheral portion of the main body portion 47D, an inner cylinder portion 47G protruding rearward from the inner peripheral portion of the main body portion 47D, a hammer groove 47A, and a hammer protrusion portion 47B. The main body portion 47D is disposed around the main shaft portion 8B. The main body portion 47D is annular. The rear outer cylinder portion 47E and the inner cylinder portion 47G respectively protrude rearward from the main body portion 47D. A recess 47C is defined by the rear surface of the main body portion 47D, the inner peripheral surface of the rear outer cylinder portion 47E, and the outer peripheral surface of the inner cylinder portion 47G. The recess 47C is provided to be recessed forward from the rear end portion of the hammer 47. The recess 47C is annular. The hammer protrusion portion 47B protrudes forward from the main body portion 47D. The hammer protrusion portion 47B protrudes radially inward from the inner peripheral surface of the front outer cylinder portion 47F. Two hammer protrusion portions 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 becomes larger.

[0111] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the reduction mechanism 7 and the main shaft 8. The hammer 47 can rotate together with the main shaft 8 based on the rotational force of the main shaft 8 rotated by the motor 6. The rotational axis of the hammer 47, the rotational axis of the main shaft 8, and the rotational axis AX of the motor 6 coincide. The hammer 47 rotates about the rotational axis AX.

[0112] The ball 48 is made of a metal such as steel. The ball 48 is disposed at a position between the main shaft portion 8B and the hammer 47. The main shaft 8 has a main shaft groove 8D for disposing at least a part of the ball 48. The main shaft groove 8D is provided on a part of the outer peripheral surface of the main shaft portion 8B. The hammer 47 has a hammer groove 47A for disposing at least a part of the ball 48. The hammer groove 47A is provided on a part of the inner surface of the inner cylinder portion 47G. The ball 48 is disposed at a position between the main shaft groove 8D and the hammer groove 47A. The ball 48 can roll inside the main shaft groove 8D and inside the hammer groove 47A respectively. The hammer 47 can move along with the ball 48. The main shaft 8 and the hammer 47 can relatively move in the axial direction and the rotational direction within the movable range defined by the main shaft groove 8D and the hammer groove 47A.

[0113] The helical spring 49 generates: an elastic force for moving the hammer 47 forward. The helical spring 49 is disposed at: a position between the flange portion 8A and the hammer 47. The helical spring 49 is provided around the main shaft portion 8B. A washer 45A is provided inside the recess 47C. The washer 45A is supported by the main body portion 47D via balls 45B. The balls 45B are disposed in: a ball groove 47H provided on the rear surface of the main body portion 47D (refer to Figure 8 ). The rear end portion of the helical spring 49 is supported by the flange portion 8A. The front end portion of the helical spring 49 is disposed inside the recess 47C and is supported by the washer 45A.

[0114] The anvil 10 is: an output portion of the impact tool 1 that operates 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 at: a position more forward than the hammer 47.

[0115] 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 quadrilateral. A sleeve as a front-end tool is assembled to the anvil shaft portion 10C. Further, 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 main shaft portion 8B. The convex portion 8E at the front end portion of the main 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.

[0116] 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 main shaft 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 at: 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 supports the anvil shaft portion 10C so as to be rotatable. Thus, the anvil bearing 46 supports the anvil 10 in the rotational direction. A groove portion 10E opposed to 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 a seal member 46A.

[0117] The hammer protrusion portion 47B can come into contact with the anvil protrusion portion 10D. In a state where the hammer protrusion portion 47B is in contact with the anvil protrusion portion 10D, by driving the motor 6, the anvil 10 rotates together with the hammer 47 and the main shaft 8.

[0118] The anvil 10 is struck in the rotational direction by the hammer 47. For example, in a screw tightening operation, when the load acting on the anvil 10 becomes large, 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 main shaft 8 and the hammer 47 can move relative to each other in the axial and circumferential directions by means of the balls 48. Even when the rotation of the hammer 47 stops, the rotation of the main shaft 8 continues by the power generated by the motor 6. When the main shaft 8 rotates in a state where the rotation of the hammer 47 has stopped, the balls 48 move rearward while being guided by the main shaft groove 8D and the hammer groove 47A respectively. The hammer 47 receives a force from the balls 48 and moves rearward along with the balls 48. That is, in a state where the rotation of the anvil 10 has stopped, the hammer 47 moves rearward by the rotation of the main shaft 8. By the hammer 47 moving rearward, the contact between the hammer projection 47B and the anvil projection 10D is released.

[0119] 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 balls 48. That is, the hammer 47 rotates while moving forward. When the hammer 47 rotates while moving forward, the hammer projection 47B rotates while coming into contact with the anvil projection 10D. Thus, the anvil projection 10D is struck in the rotational direction by the hammer projection 47B. The power of the motor 6 and the inertial force of the hammer 47 are both applied to the anvil 10. Therefore, the anvil 10 can rotate about the rotation axis AX with a high torque.

[0120] As Figure 6 shown, the fan 12 rotates by the rotational force of the motor 6. The fan 12 is arranged at a position further forward than 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 part of the rotor shaft portion 33. The fan 12 is arranged at a position between the rotor bearing 40 and the stator 26. The fan 12 rotates by the rotation of the rotor 27. By the rotation of the rotor shaft portion 33, the fan 12 rotates together with the rotor shaft portion 33. By the rotation of the fan 12, the air in the outer space of the housing 2 flows into the inner space of the housing 2 through the air inlet 21A. The air flowing into the inner space of the housing 2 cools the motor 6 by flowing through the inner space of the housing 2. The air flowing through the inner space of the housing 2 flows out to the outer space of the housing 2 through the air outlet 21B by the rotation of the fan 12.

[0121] As Figure 4 shown, the battery pack 80 is assembled in the battery holding part 23. The battery pack 80 functions as a power source for the impact tool 1. The battery pack 80 includes a secondary battery. In the embodiment, the battery pack 80 includes a rechargeable lithium-ion battery. By being assembled in the battery holding part 23, the battery pack 80 can supply power to the impact tool 1. The motor 6 and the light-emitting unit 16 are respectively driven based on the power supplied from the battery pack 80.

[0122] The battery pack 80 has a release switch 81. The release switch 81 is disposed at: the front part of the upper surface of the battery pack 80. The release switch 81 is a push-button switch. When the release switch 81 is pressed downward, it moves 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 upper movement limit position, and a finger placement portion 84 that is pressed downward by the operator.

[0123] The battery holding part 23 has: an engagement recess 23A that comes into contact with the engagement hook portion 82. The engagement recess 23A is recessed upward from the lower surface of the battery holding part 23. By the engagement hook portion 82 entering the inside of the engagement recess 23A, the battery holding part 23 engages in such a manner that the battery pack 80 does not come off. When the release switch 81 is pressed by pressing the finger placement portion 84, causing the engagement hook portion 82 to disengage downward from the engagement recess 23A, the battery pack 80 can be detached from the battery holding part 23. The front part of the lower surface portion of the battery holding part 23 slopes forward and obliquely upward. The front part of the upper surface of the battery pack 80 where the release switch 81 is provided slopes forward and obliquely downward.

[0124] The battery holding part 23 has: a controller 17 that controls the light-emitting unit 16, and an interface panel 18. The controller 17 includes a computer system. The controller 17 outputs: a control instruction 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 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.

[0125] The controller 17 sets the driving conditions of the motor 6 based on the operation of the interface panel 18. As described above, the driving conditions of the motor 6 include a current threshold.

[0126] The interface panel 18 is provided in the battery holding part 23. The interface panel 18 includes: an operating device and a display device. The interface panel 18 is in a plate shape. The operating device includes operating buttons. As the display device, examples that can be cited are: a segmented display of a plurality of segmented light emitters, a flat panel display such as a liquid crystal display, and an indicator type display configured with a plurality of light emitting diodes.

[0127] The trigger switch 14 is provided in the gripping part 22. The trigger switch 14 is operated by the operator to start the motor 6. By operating the trigger switch 14, the driving and stopping of the motor 6 are switched.

[0128] The forward and reverse switching switch 15 is provided in the upper part of the gripping part 22. The forward and reverse switching switch 15 is operated by the operator. By operating the forward and reverse switching switch 15, the rotation direction of the motor 6 is switched from one of the forward rotation direction and the reverse rotation direction to the other. By switching the rotation direction of the motor 6, the rotation direction of the main shaft 8 is switched.

[0129] <Light emitting unit>

[0130] Figure 9 It is a longitudinal sectional view showing the upper part of the impact tool 1 according to the embodiment. Figure 10 It is an exploded perspective view showing the light emitting unit 16 according to the embodiment. Figure 11 It is an exploded perspective view showing the light emitting unit 16 according to the embodiment as viewed from the rear. Figure 12 It is an exploded perspective view showing the light emitting unit 16 and the setting part 3D according to the embodiment. Figure 13 It is a view showing the light emitting unit 16 arranged in the setting part 3D as viewed from the front. Figure 14 It is a perspective view showing the opening 24A of the support part 24 according to the embodiment. Figure 15 It is a view showing the slit 3G of the hammer housing part 3 according to the embodiment as viewed from below.

[0131] The light emitting unit 16 emits illumination light. The light emitting unit 16 illuminates the anvil 10 and the periphery of the anvil 10 with the illumination light. The light emitting unit 16 illuminates the front end side of the anvil 10 with the illumination light.

[0132] The light-emitting unit 16 is disposed at: the front part of the hammer housing part 3. The light-emitting unit 16 is disposed at: the front surface part 3C of the hammer housing part 3. The light-emitting unit 16 is disposed around: the front cylinder part 3B. The light-emitting unit 16 is formed to surround: the anvil 10. The light-emitting unit 16 is disposed around the anvil shaft part 10C by means of the front cylinder part 3B. In the embodiment, the light-emitting unit 16 has an annular shape that surrounds the anvil 10.

[0133] The light-emitting unit 16 includes a plurality of light emitters 52. The light emitters 52 are LED (light emitting diodes) elements. In the embodiment, the light-emitting unit 16 includes a chip on board LED (COB LED) lamp (hereinafter referred to as the COB lamp 50). The COB lamp 50 irradiates light toward the front end side of the anvil 10.

[0134] The COB lamp 50 has a substrate 51 and a plurality of light emitters 52. As the substrate 51, an aluminum substrate, a glass cloth base epoxy resin substrate (FR-4 substrate), or a composite base epoxy resin substrate (CEM-3 substrate) can be exemplified. The light emitters 52 are mounted on the surface of the substrate 51. The light emitters 52 and the substrate 51 are connected by metal wires (not shown). The metal wires connect the plurality of light emitters 52 to each other. The plurality of light emitters 52 are surrounded by a dam. A phosphor is disposed in the divided space surrounded by the dam. The light emitters 52 are covered by the 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 dam. One of the pair of electrodes is a positive electrode, and the other is a negative electrode. The wires 60 are respectively connected to the pair of electrodes. The power output from the battery pack 80 is supplied to the electrodes via the wires 60. The power supplied to the electrodes is supplied to the light emitters 52 via the substrate 51 and the metal wires. The light emitters 52 emit light based on the power supplied from the battery pack 80. The voltage of the battery pack 80 is applied to the light emitters 52 in a state of being stepped down to 5V by the controller 17. The controller is housed in the battery holding part 23. The light-emitting unit 16 and the controller are connected by the wires 60.

[0135] The COB lamp 50 is annular. The COB lamp 50 is disposed around the anvil shaft part 10C by means of the front cylinder part 3B. The substrate 51 has an annular part 51A and a support part 51B that projects downward from the lower part of the annular part 51A. The substrate 51 is arranged to surround the anvil shaft part 10C.

[0136] A plurality of light emitters 52 are arranged along the circumferential rotation direction of the anvil 10. The light emitters 52 are arranged by means of the front cylinder portion 3B at at least a part of the periphery of the anvil shaft portion 10C. 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 along the rotation 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 only required to be plural and is not limited. In the embodiment, 24 light emitters 52 are arranged at equal intervals in the circumferential direction of the annular portion 51A (refer to Figure 13 ).

[0137] The phosphor 53 is arranged on the front surface of the annular portion 51A of the substrate 51. The phosphor 53 is continuous in such a manner 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 in an annular shape. The phosphor 53 is arranged to cover the plurality of light emitters 52 respectively.

[0138] The light emitter unit 16 has an optical component 55.

[0139] The optical component 55 is connected to the COB lamp 50. The optical component 55 is fixed to the substrate 51. The optical component 55 is made of polycarbonate resin. In the embodiment, the optical component 55 is made of polycarbonate resin containing a white diffusing material. The optical component 55 is milky white. The optical component 55 transmits at least a part of the light emitted from the COB lamp 50. The light transmittance of the optical component 55 is, for example, 40% or more and 70% or less. The optical component 55 diffuses the light of the plurality of light emitters 52.

[0140] The optical component 55 is arranged to cover the front side of the plurality of light emitters 52. At least a part of the optical component 55 is arranged at a position more forward than the COB lamp 50. The optical component 55 is continuous in a manner straddling the plurality of light emitters 52. The optical component 55 is in an annular shape. The optical component 55 has an outer cylinder portion 55A, an inner cylinder portion 55B, a light transmission portion 55C, and a convex portion 55D.

[0141] The outer cylinder portion 55A is arranged at a position more radially outward than the inner cylinder portion 55B. The outer cylinder portion 55A is arranged at the outer peripheral side position of the COB lamp 50. The outer cylinder portion 55A is arranged at a position more radially outward than the light emitter 52. In the radial direction, the COB lamp 50 is arranged at a position between the outer cylinder portion 55A and the inner cylinder portion 55B. The outer cylinder portion 55A is arranged at a position more radially outward than the annular portion 51A of the substrate 51. The inner cylinder portion 55B is arranged at the inner peripheral side of the COB lamp 50. The inner cylinder portion 55B is arranged at a position more radially inward than the annular portion 51A of the substrate 51. The inner cylinder portion 55B is arranged at a position more radially inward than the light emitter 52.

[0142] The light transmission part 55C is arranged at a position more forward than the COB lamp 50. The light transmission part 55C is in an annular shape. The light transmission part 55C is arranged at a position more forward than the light-emitting body 52. The light transmission part 55C is configured 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 transmission part 55C is opposed to the front surface of the annular part 51A. The light transmission part 55C is opposed to the light-emitting body 52. The light emitted from the light-emitting body 52 passes through the light transmission part 55C and is irradiated to the front of the light-emitting unit 16. The front surface of the light transmission part 55C constitutes the front surface 16A of the light-emitting unit 16.

[0143] The convex part 55D is arranged at a position more downward than the light transmission part 55C. The convex part 55D is set to protrude downward from the lower part of the outer cylinder part 55A. As Figure 11 shown, a receiving space is formed on the rear surface of the convex part 55D. The supporting part 51B of the substrate 51 is arranged in the receiving space formed on the rear surface of the convex part 55D. The convex part 55D covers and protects the front of the wire 60 passing from the rear of the substrate 51. In addition, the convex part 55D functions as a positioning part of the light-emitting unit 16 in the rotation direction by being arranged in the slit 3G of the hammer receiving part 3 described later.

[0144] The rear surface of the substrate 51 is arranged at a position more forward than the rear end part of the outer cylinder part 55A and the rear end part of the inner cylinder part 55B. The rear surface of the substrate 51 is fixed to at least a part of the inner peripheral surface of the outer cylinder part 55A by an adhesive. The rear surface of the substrate 51 is fixed to at least a part of the outer peripheral surface of the inner cylinder part 55B by an adhesive. The COB lamp 50 and the optical component 55 are fixed.

[0145] The hammer receiving part 3 supports the light-emitting unit 16 on the front surface part 3C. The hammer receiving part 3 has a setting part 3D for receiving the light-emitting unit 16. The setting part 3D is arranged on the front surface part 3C of the hammer receiving part 3. The setting part 3D is arranged at a position between the outer periphery of the front cylinder part 3B and the front surface part 3C. The setting part 3D is integrally formed with the hammer receiving part 3. The setting part 3D is arranged in a surrounding shape along the outer periphery of the front cylinder part 3B. In the embodiment, the setting part 3D is in an annular and concave shape. The light-emitting unit 16 is received inside the annular and concave setting part 3D. The setting part 3D receives at least a part of the light-emitting unit 16. The setting part 3D may not be a completely continuous ring and may be locally discontinuous. A part of the light-emitting unit 16 may also be arranged outside the setting part 3D. At least a part of the light-emitting unit 16 is arranged at a position between the outer peripheral surface 3E of the hammer receiving part 3 and the front cylinder part 3B.

[0146] The hammer housing portion 3 has a wall portion 3F that surrounds the outer periphery of the light-emitting unit 16. The wall portion 3F protrudes forward from the front surface portion 3C of the hammer housing portion 3. The wall portion 3F is arranged in a surrounding shape along the outer peripheral edge of the front surface portion 3C of the hammer housing portion 3. The wall portion 3F is substantially annular, but a notch is formed in the portion of the slit 3G. The wall portion 3F surrounds the entire circumference of the light-emitting unit 16 except for the portion of the convex portion 55D of the light-emitting unit 16.

[0147] The wall portion 3F constitutes the outer periphery of the setting portion 3D. The inner periphery of the setting portion 3D is constituted by the front cylinder portion 3B. The wall portion 3F and the front cylinder portion 3B protrude forward from the front surface portion 3C to constitute the concave setting portion 3D. The region between the front cylinder portion 3B and the wall portion 3F in the front surface portion 3C constitutes the bottom surface of the setting portion 3D. At least a part of the light-emitting unit 16 is arranged at a position between the wall portion 3F and the front cylinder portion 3B. All of the light-emitting unit 16 except for the portion of the convex portion 55D is arranged at a position between the wall portion 3F and the front cylinder portion 3B.

[0148] The wall portion 3F extends to the same position as the front surface 16A of the light-emitting unit 16 or a position further forward than the front surface 16A of the light-emitting unit 16. In the embodiment, the wall portion 3F protrudes to a position slightly forward of the front surface 16A of the light-emitting unit 16. In addition, the front cylinder portion 3B on the inner peripheral side of the light-emitting unit 16 also extends to a position further forward than the front surface 16A of the light-emitting unit 16. The front cylinder portion 3B extends to a position further forward than the wall portion 3F.

[0149] The COB lamp 50 is arranged at an inner position of the setting portion 3D. At least a part of the optical component 55 is arranged at an inner position of the setting portion 3D. The light-transmitting portion 55C is arranged at an inner position of the setting portion 3D. The outer cylinder portion 55A and the inner cylinder portion 55B are respectively arranged at an inner position of the setting portion 3D.

[0150] A snap ring groove 3J is provided in the front cylinder portion 3B. The snap ring groove 3J is provided at a position further forward than the front surface 16A of the light-emitting unit 16. A snap ring 56 is arranged in the snap ring groove 3J. The snap ring 56 functions as a detachment prevention portion for preventing the light-emitting unit 16 from falling off forward. The snap ring 56 supports the optical component 55 from the front side.

[0151] The wall portion 3F has a slit 3G through which the wire 60 passes. As Figure 14As shown, 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 is vertically opposed to the support column portion 24. A slit 3G is provided in a portion of the wall portion 3F that is opposed to 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 also be a through-hole that penetrates in a window shape between the front end and the rear end of the wall portion 3F.

[0152] The support column portion 24 has an upper end surface 24B that bends along the outer peripheral surface of the wall portion 3F. An opening 24A is formed on the upper end surface 24B and at a position opposed to the slit 3G. The opening 24A communicates with the internal space of the support column portion 24. The setting portion 3D on the inner peripheral side of the wall portion 3F is opposed to the internal space of the support column portion 24 via the slit 3G and the opening 24A. Thus, the slit 3G connects the light-emitting element unit 16 to the inside of the support column portion 24. As Figure 12 and Figure 13 shown, the convex portion 55D of the optical component 55 and the support portion 51B of the substrate 51 in the light-emitting element unit 16 are disposed at positions inside the slit 3G.

[0153] A buffer member 57 is disposed between the hammer housing portion 3 and the light-emitting element unit 16. The buffer member 57 is disposed at a position behind the COB lamp 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 or the optical component 55 made of a resin material from coming into contact with the metal vibrating body, that is, the hammer housing portion 3. The buffer member 57 covers at least one of the rear surface of the light-emitting element unit 16, the inner peripheral surface, and the outer peripheral surface 3E of the light-emitting element unit 16. In the embodiment, the buffer member 57 covers the rear surface of the light-emitting element unit 16 and the inner peripheral surface of the light-emitting element unit 16.

[0154] The buffer member 57 includes a bottom plate portion 57A, an inner peripheral wall portion 57B, and a protruding portion 57C.

[0155] The bottom plate portion 57A covers the rear surface of the light-emitting element unit 16. The bottom plate portion 57A is flat and annular. The bottom plate portion 57A is provided on the bottom surface of the setting portion 3D. The rear surface of the bottom plate portion 57A is in contact with the bottom surface of the setting portion 3D. The front surface of the bottom plate portion 57A is in contact with 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 faces rearward and is separated from the substrate 51 of the light-emitting element unit 16. The inner periphery of the bottom plate portion 57A is in contact with the front cylinder portion 3B of the hammer housing portion 3. The outer periphery of the bottom plate portion 57A is in contact with the wall portion 3F of the hammer housing portion 3. The bottom plate portion 57A substantially covers the entire bottom surface of the setting portion 3D.

[0156] The inner peripheral wall portion 57B covers the inner peripheral surface of the light-emitting element 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 in a surrounding shape along the inner peripheral edge of the bottom plate portion 57A. The inner peripheral surface of the inner peripheral wall portion 57B is in contact with the front cylinder portion 3B of the hammer housing portion 3. The outer peripheral surface of the inner peripheral wall portion 57B is in contact with the inner cylinder portion 55B of the optical member 55. By fitting the inner cylinder portion 55B onto the outer periphery of the inner peripheral wall portion 57B, the optical member 55 is fixed to the front cylinder portion 3B by means of the inner peripheral wall portion 57B. Thereby, it is possible to prevent the positional deviation of the light-emitting element unit 16 in the radial direction (vertical direction and horizontal direction).

[0157] Four inner peripheral wall portions 57B are provided at equal angular intervals in the rotational direction. Recesses 57D are formed by the gaps between the four inner peripheral wall portions 57B. Four recesses 57D are provided through the gaps between adjacent inner peripheral wall portions 57B. Ribs 55E provided on the inner cylinder portion 55B of the optical member 55 are arranged in the recesses 57D. By engaging the recesses 57D with the ribs 55E, it is possible to prevent the positional deviation of the light-emitting element unit 16 in the rotational direction. The thickness of the inner peripheral wall portion 57B is greater than the protruding amount by which the ribs 55E protrude from the inner cylinder portion 55B. Accordingly, the ribs 55E are arranged at positions more outward than the inner peripheral surface of the inner peripheral wall portion 57B and are separated from the front cylinder portion 3B of the hammer housing portion 3.

[0158] The protruding portion 57C protrudes downward from the lower part of the bottom plate portion 57A. As Figure 12 shown, the protruding portion 57C is arranged inside the slit 3G of the wall portion 3F. The protruding portion 57C is arranged inside the slit 3G at a position between the rear surface of the light-emitting element unit 16 and the front surface portion 3C of the hammer housing portion 3. 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 is in contact with the front surface portion 3C.

[0159] A pair of protrusions 57E are formed at both ends of the protrusion portion 57C in the left-right direction. The pair of protrusions 57E protrude forward from the protrusion portion 57C. The pair of protrusions 57E are respectively 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. 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 respectively in contact with the side surfaces of the convex portion 55D of the optical member 55. 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 clamped by 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. Accordingly, even if the hammer housing portion 3 vibrates, contact with the hammer housing portion 3 can be avoided through the buffer member 57.

[0160] According to such a configuration, the light-emitting unit 16 is held by the hammer housing portion 3 via the buffer member 57 at the setting portion 3D in a state of not being in contact with the hammer housing portion 3. Even in the case where the hammer housing portion 3 vibrates due to the hammer 47 colliding with the anvil 10, the buffer member 57 can prevent the situation where the light-emitting unit 16 directly contacts the hammer housing portion 3.

[0161] In addition, as Figure 15 shown, the impact tool 1 includes a guiding portion GD that guides the wire 60 passing through the slit 3G so as not to contact the hammer housing portion 3. The guiding portion GD is formed by a passage portion surrounded by the buffer member 57 and the convex portion 55D inside the slit 3G.

[0162] As described above, the rear of the slit 3G is demarcated by the front surface portion 3C of the hammer housing portion 3, the left and right directions of the slit 3G are demarcated by the end faces of the wall portion 3F, and the front of the slit 3G is open. The buffer member 57 covers the front surface portion 3C by the protrusion portion 57C. The buffer member 57 covers the end faces of the left and right wall portions 3F by the pair of protrusions 57E.

[0163] Here, the rear surface of the convex portion 55D of the light-emitting unit 16 is arranged at a position that is spaced forward from the protrusion portion 57C of the buffer member 57. The rear surface of the convex portion 55D is located at a position more forward than the rear surfaces of the outer cylinder portion 55A and the inner cylinder portion 55B. Accordingly, in a state where the rear surfaces of the outer cylinder portion 55A and the inner cylinder portion 55B are in contact with the bottom plate portion 57A of the buffer member 57, the rear surface of the convex portion 55D is located at a position more forward than the protrusion portion 57C. Thus, as Figure 15As shown, when observing the slit 3G from below upward, a space is formed that is surrounded by the buffer member 57 in the left-right direction and the rear, and surrounded by the convex portion 55D in the front. The wire 60 passes through the space surrounded by the buffer member 57 and the convex portion 55D, and thus does not come into direct contact with the hammer housing portion 3, but passes through the inside of the slit 3G. Therefore, in the embodiment, the buffer member 57 and the convex portion 55D function as the guiding portion GD. Here, a part of the buffer member 57 and the optical member 55 is used as the guiding portion GD. However, for example, a cylindrical member may also be provided inside the slit 3G and used as the guiding portion GD.

[0164] As Figure 9 shown, the convex portion 55D of the light-emitting unit 16 enters the inside of the support portion 24. The lower end portion of the convex portion 55D passes through the slit 3G and is disposed inside the support portion 24. The convex portion 55D inside the opening 24A of the support portion 24 and the upper end surface 24B of the support portion 24 (refer to Figure 14 ) overlap within the range of length E. Thus, even in the portion of the gap between the upper end surface 24B of the support portion 24 and the slit 3G, the wire 60 does not protrude forward and is covered by the convex portion 55D.

[0165] The wire 60 passes through the inside of the support portion 24. The wire 60 passes upward from the opening 24A of the upper end surface 24B of the support portion 24 through the inside of the slit 3G (inside the guiding portion GD) of the hammer housing portion 3 and is connected to the light-emitting unit 16. The 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 wire 60 enters downward from the opening 24A of the support portion 24 and reaches the battery holding portion 23. The wire 60 is connected to: the controller 17 disposed inside the battery holding portion 23 (refer to Figure 16 ). In this way, the wire 60 passes through the upper end portion of the support portion 24 to the lower end portion of the support portion 24 and is connected to the controller 17. One end of the wire 60 is disposed at a position above the upper end of the support portion 24 (the front surface portion 3C of the hammer housing portion 3). The other end of the wire 60 is disposed at a position below the lower end of the support portion 24 (the battery holding portion 23).

[0166] <First protective cover and second protective cover>

[0167] 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 respectively cover a range including a part of the light-emitting unit 16.

[0168] As Figures 1 to 4As shown, the first protective cover 61 is disposed at the outer peripheral portion of the front surface 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. Accordingly, the first protective cover 61 covers from the front the passage path of the wire 60 that enters the opening 24A of the support column portion 24 via the slit 3G from the light emitting unit 16. 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 surface portion 3C of the hammer housing portion 3 over the entire circumference.

[0169] The second protective cover 62 is disposed at 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 at the portion of the front cylinder portion 3B in the front surface portion 3C. The second protective cover 62 covers the front cylinder portion 3B and the inner peripheral portion of the front surface 16A of the light emitting unit 16. In addition, the second protective cover 62 covers the snap ring 56 assembled 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.

[0170] The first protective cover 61 and the second protective cover 62 are elastic bodies such as rubber materials. 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 emitting unit 16 is covered by the first protective cover 61. The inner periphery of the front surface 16A of the light emitting 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 emitting 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 is the light emission area of the light from the light emitting unit 16 toward the outside. The annular portion faces the light emitting body 52 in the front-rear direction. The width of the annular portion is greater than the radial length of the light emitting body 52. Thus, the emitted light from the light emitting unit 16 is contracted within the range from the annular portion toward the front.

[0171] When the impact tool 1 is used, the first protective cover 61 and the second protective cover 62 can suppress the situation where obstacles come into contact with the light-emitting body unit 16. When the impact tool 1 is used, the first protective cover 61 and the second protective cover 62 protect the front surface portion 3C or the front cylinder portion 3B of the metal hammer housing portion 3 so that the metal hammer housing portion 3 does not damage the external object when it collides with the external object. The first protective cover 61 and the second protective cover 62 can suppress the light leakage from the slit 3G or the protrusion 55D, the excessive diffusion of light toward a wide angle, and the unnecessary surface reflection of the hammer housing portion 3 including the front cylinder portion 3B by limiting the light emission area at the front surface 16A of the light-emitting body unit 16 to the annular portion.

[0172] In addition, if Figure 6 , Figure 8 As shown, in the hammer housing portion 3, at the rear and outer periphery of the light-emitting unit 16, there is formed an outer peripheral protrusion 3K extending in a circumferential shape within a range of about 270 degrees in the circumferential direction. The outer peripheral protrusion 3K has two functions. One function is to prevent the first protective cover 61 from falling off toward the front as an anti-falling protrusion. The outer peripheral protrusion 3K is covered by the first protective cover 61. The first protective cover 61 has a recessed portion that covers the outer peripheral protrusion 3K in a manner of embracing the outer peripheral protrusion 3K and the front and back of the outer peripheral protrusion 3K. The first protective cover 61 is made of an elastomer and can fall off from the hammer housing portion 3 by the elastomer stretching. The outer peripheral protrusion 3K and the recessed portion of the first protective cover 61 that fits with the outer peripheral protrusion 3K make it difficult for the first protective cover 61 to move toward the front.

[0173] Another function of the peripheral protrusion 3K is to protect the wall portion 3F. The wall portion 3F stands forward from the front surface portion 3C of the hammer housing 3. However, it is also conceivable that the wall portion 3F may be broken due to the collision when it collides with other components during use. Therefore, it is effective to make the wall portion 3F less likely to collide. The peripheral protrusion 3K is arranged at the rear of the wall portion 3F. When the wall portion 3F is Figure 6 When the cross section is observed in the up-down and front-back directions shown in FIG. 1 , the wall portion 3F is arranged at a position lower and rearward than the imaginary plane IL1 that can be drawn through the upper portion 3KU of the peripheral protrusion 3K and the upper portion of the anvil 10. Figure 8When observing the cross-section in the left-right and front-back directions as shown, the wall portion 3F is arranged at a position that is more to the left and rear than the imaginary plane IL2 that can be drawn through the right portion 3KR of the outer peripheral protrusion 3K and the right portion of the anvil 10. Similarly, the wall portion 3F is arranged at a position that is more to the right and rear than the imaginary plane IL3 that can be drawn through the left portion 3KL of the outer peripheral protrusion 3K and the left portion of the anvil 10. In this way, the wall portion 3F is formed so as not to protrude outward from the imaginary planes IL1, IL2, and IL3. Accordingly, the imaginary planes IL1, IL2, and IL3 serve as thresholds for protecting the wall portion 3F, reducing the possibility of the wall portion 3F breaking.

[0174] <Controller>

[0175] Figure 16 It is a longitudinal sectional view showing an enlarged view of the lower part of the impact tool 1 according to the embodiment. The larger the maximum tightening torque of the impact tool 1, the larger the motor 6 becomes, and thus the current flowing through the coil 31 also increases. In order to correspond to the increase in current, the controller 17 also tends to become larger. When the battery holding portion 23 becomes larger along with the enlargement of the controller 17, the operability of the impact tool 1 decreases. Accordingly, it is desired that even if the controller 17 is enlarged, an increase in the external dimensions of the battery holding portion 23 can be suppressed. Accordingly, in the embodiment, by tilting the controller 17 within the battery holding portion 23, a larger installation space within the battery holding portion 23 can be ensured.

[0176] The controller 17 is arranged above the battery pack 80 inside the battery holding portion 23. The controller 17 is long in the front-back direction. The battery holding portion 23 includes a rear holding portion 23B that holds the rear portion of the controller 17 and a front holding portion 23C that holds the front portion of the controller 17. The rear portion of the controller 17 is arranged in the front-back direction at a position below the lower end portion of the grip portion 22. The rear portion of the controller 17 is arranged in the front-back direction at a position between the rear portion of the battery pack 80 and the engagement hook portion 82. The front portion of the controller 17 is arranged in the front-back direction at a position below the lower end portion of the support portion 24. The front portion of the controller 17 is arranged in the front-back direction at a position more forward than the engagement hook portion 82. The front portion of the controller 17 and the finger placement portion 84 are arranged one above the other (vertically overlapped). An engagement concave portion 23A is arranged below the front portion of the controller 17.

[0177] The controller 17 has a flat plate shape. The front portion of the controller 17 is arranged at a position higher than the rear portion of the controller 17. The controller 17 inclines 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.

[0178] <Dimensions of the motor>

[0179] As described above, in the impact tool 1 of the model with a relatively 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. Due to the increase in the overall length of the impact tool 1, the operability of the impact tool 1 is reduced. Accordingly, in the embodiment, while maintaining the maximum tightening torque, the length of the stator 26 in the front-rear direction is shortened, so that the overall length of the motor 6 of the impact tool 1 is shortened. Corresponding to the shortening of the overall length of the motor 6, the increase in the overall length of the impact tool 1 is suppressed.

[0180] Figure 17 This is a longitudinal sectional view of the motor housing 21 of the impact tool 1 according to the embodiment, enlarged. 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 a stator core 28 with a large diameter, the length of the stator 26 can be shortened while maintaining performance. The length L1 of the stator core 28 is smaller than the length L3 of the gearbox 38. The outer diameter D1 of the stator core 28 is larger than the outer diameter D6 of the spiral 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 at a position more radially outward than the outer periphery of the fan 12. The motor 6 and the fan 12 are separated 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 at a position more radially outward than the opening 21E. The opening 21E faces the end face of the rotor core portion 32 in the front-rear direction.

[0181] 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 at a position more radially outward than the holding cylinder portion 38C of the gearbox 38. The length L2 of the rotor core portion 32 is smaller than the length L3 of the gearbox 38.

[0182] An example of the specific dimensions of this embodiment will be described. As Figure 6As shown, the overall length of the impact tool 1 is represented by length L11 + length L12 + length L13. Length L11 is the length from the front surface of the anvil 10 to the front surface of the gearbox 38. Length L12 is the length from the front surface of the gearbox 38 to the rear surface of the gearbox 38. Length L13 is the length from the rear surface of the gearbox 38 to the rear surface of the motor housing 21. Length L11 is 163.2 mm. Length L12 is 30.3 mm. 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.

[0183] The reduction in the length L1 of the stator core 28 is particularly helpful for shortening the length L13 from the rear surface of the gearbox 38 to the rear surface of the motor housing 21. In the present embodiment, the condition that 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 gearbox 38 by the length L13 from the rear surface of the gearbox 38 to the rear surface of the motor housing 21 is 2.6 or more is satisfied. The dimensional ratio R1 is represented by the following formula.

[0184] R1 = (L11 + L12) / L13

[0185] The dimensional ratio R1 is preferably 2.75 or more, more preferably 2.9 or more. Additionally, the dimensional ratio R1 is preferably 8.9 or less. In the case of the above dimensional example, the dimensional ratio R1 is 2.97.

[0186] Further, in the present embodiment, the condition that 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 gearbox 38 by the length L1 of the stator core 28 is 7.0 or more is satisfied. The dimensional ratio R2 is represented by the following formula.

[0187] R2 = (L11 + L12) / L1

[0188] The dimensional ratio R2 is preferably 9.5 or more, more preferably 12.0 or more. Additionally, the dimensional ratio R2 is preferably 38.7 or less. In the case of the above dimensional example, the dimensional ratio R2 is 12.9.

[0189] The dimensional ratios R1 and R2 indicate that the larger the value, the smaller the proportion of the length dimensions of the motor housing 21 and the stator 26 in the overall length of the impact tool 1. Accordingly, by configuring as described above, the overall length of the impact tool 1 can be effectively shortened.

[0190] <Side Handle>

[0191] Figure 18This is a perspective view of the side handle 90 according to the embodiment. Figure 19 This is a cross-sectional view taken from the front of a cross-section passing through the fitting portion of the side handle 90 according to the embodiment. Figure 20 This is a perspective view of the strap fitting portion 70 according to the embodiment.

[0192] The impact tool 1 can be disassembled and assembled with 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 strap 93 for fastening the impact tool 1. By using the fastening mechanism 92 to fasten the strap 93 that surrounds a specified portion of the impact tool 1, the side handle 90 is detachably fixed to the impact tool 1. In addition, Figures 1 to 4 for the sake of easy understanding, a state where only the strap 93 of the side handle 90 is assembled to the impact tool 1 is shown, and the illustration of the handle base 91 and the fastening mechanism 92 is omitted.

[0193] As Figures 1 to 3 and Figure 20 shown, the impact tool 1 has: a strap fitting portion 70 for mounting the strap 93 of the side handle 90. The strap fitting portion 70 is provided circumferentially along the outer periphery of the hammer housing portion 3. The strap fitting portion 70 is arranged to pass through from the inside of the annular handle portion 11. The strap fitting portion 70 is disposed at a position more forward than the gripping portion 22. The strap fitting portion 70 is disposed at a position more rearward than the support portion 24. The strap fitting portion 70 is disposed at the connecting portion 25. In this way, the strap fitting portion 70 is arranged to straddle the hammer housing portion 3 and the housing 2 (connecting portion 25). The side handle 90 can be disassembled and assembled relative to the hammer housing portion 3. By using the strap 93 to surround and fasten the hammer housing portion 3 and the housing 2 (connecting portion 25), the side handle 90 is fixed to the impact tool 1. When assembling the side handle 90, the light-emitting unit 16 is disposed at a position in front of the side handle 90.

[0194] As Figure 18 and Figure 19As shown, 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 from the other end of the columnar portion 91A in the same direction as the first arm 91B. The first arm 91B and the second arm 91C are bent toward each other. The handle base 91 has a C-shaped configuration by means of the columnar portion 91A, the first arm 91B, and the second arm 91C. A resin handle grip portion 94 is provided on the columnar portion 91A. The handle grip portion 94 is a cylindrical member that surrounds the periphery of the columnar portion 91A and is gripped by the hand of an operator. The handle base 91 holds the fastening mechanism 92 and the strap 93. The handle base 91 holds the fastening mechanism 92 by means of the first arm 91B and the second arm 91C. A first holding portion 95 is provided at the front end of the first arm 91B. A second holding portion 96 is provided at the front end of the second arm 91C.

[0195] The first holding portion 95 has a cylindrical shape. The first holding portion 95 has a stepped inner diameter such that the inner diameter opening toward the inside of the second holding portion 96 is smaller than the outer diameter opening toward the direction opposite to the second holding portion 96. The first holding portion 95 holds the cam member 97. The cam member 97 has a cylindrical shape, and the outer peripheral surface thereof is shrunk in a stepped manner in cooperation with the inner surface of the first holding portion 95. The cam member 97 is inserted into the inside of the first holding portion 95 from the outer opening of the first holding portion 95 and engages with the stepped portion of the inner surface of the first holding portion 95. The cam member 97 can move along the central axis BX of the bolt 98A within the first holding portion 95 in the range from the outer opening to the stepped portion. The cam member 97 has a cam engagement surface 97A facing the second holding portion 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 portion of the bolt 98A is inserted. The cam member 97 has a concave portion 97C. The concave portion 97C is formed on the outer surface of the cam member 97 facing the direction opposite to the second holding portion 96 and is recessed toward the second holding portion 96.

[0196] The second holding part 96 has: an inner surface 96A facing the inner side of the first holding part 95, an outer surface 96B facing the direction opposite to the first holding part 95, and an insertion through-hole 96C through which the shaft part of the bolt 98A passes. The inner surface 96A is an engaging surface with a concavo-convex pattern. An arcuate bolt holding part 96D for housing 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 through-hole 96C. The bolt holding part 96D has an inner surface shape corresponding to the shape of the tool receiving part of the head of the bolt 98A and engages with the bolt 98A. Thus, the bolt 98A is held inside the bolt holding part 96D in a non-rotatable manner.

[0197] The fastening mechanism 92 includes: a bolt 98A, a nut 98B, a cam member 97, and a fastening knob 99. The bolt 98A straddles the first holding part 95 and the second holding part 96. The bolt 98A passes through the insertion through-hole 96C and the insertion through-hole 97B from the outer surface 96B of the second holding part 96 and penetrates the cam member 97. The bolt 98A is held in the second holding part 96 by supporting the head of the bolt 98A on the bottom surface of the bolt holding part 96D of the second holding part 96.

[0198] The fastening knob 99 is disposed on the first holding part 95. The fastening knob 99 has: a gripping part 99A, and a protruding part 99B protruding from the gripping part 99A toward the cam member 97. The fastening knob 99 has: an insertion through-hole 99C penetrating the gripping part 99A and the protruding part 99B, and an arcuate nut holding part 99D formed on the gripping part 99A. The protruding part 99B is disposed inside the concave part 97C of the cam member 97. The front end part of the protruding part 99B contacts the inner bottom surface of the concave part 97C.

[0199] The front end part of the bolt 98A passes through the insertion through-hole 99C and reaches the inside of the nut holding part 99D. The inner diameter of the nut holding part 99D is larger than the inner diameter of the insertion through-hole 99C. The nut holding part 99D houses the nut 98B. The nut holding part 99D has an inner surface shape corresponding to the shape of the tool receiving part of the nut 98B and engages with the nut 98B. Thus, the fastening knob 99 rotates together with the nut 98B. The nut 98B engages with the threaded part of the bolt 98A inside the nut holding part 99D.

[0200] The strap 93 is a C-shaped band-like component. The strap 93 is made of metal. At one end and the other end of the strap 93, a first fitting portion 101 and a second fitting portion 102 are respectively provided. The first fitting portion 101 and the second fitting portion 102 are made of resin. The first fitting portion 101 and the second fitting portion 102 are annular and are penetrated by a bolt 98A. The first fitting portion 101 faces the cam engagement surface 97A of the cam member 97. The first fitting portion 101 has an engaging surface 103 with a concavo-convex pattern and engages with the cam engagement surface 97A. The second fitting portion 102 faces the inner surface 96A of the second holding portion 96. The second fitting portion 102 has an engaging surface 103 with a concavo-convex pattern and engages with the inner surface 96A of the second holding portion 96. Each engaging surface 103 engages with the cam engagement surface 97A and the inner surface 96A in the rotational direction around the central axis BX of the bolt 98A. Through the engaging surface 103, the relative angle of the strap 93 with respect to the handle base 91 in the rotational direction around the central axis BX is fixed.

[0201] By inserting the bolt 98A through the first fitting portion 101 and the second fitting portion 102, the strap 93 is held on the handle base 91. Since the C-shaped strap 93 is connected to the bolt 98A at the portions of the first fitting portion 101 and the second fitting portion 102 at both ends, the strap 93 is substantially in an annular shape that surrounds the entire circumference of the strap fitting portion 70.

[0202] Protrusions 93A and 93B are provided on the inner peripheral surface of the strap 93. The protrusions 93A and 93B have a V-shaped convex shape. The protrusion 93A is disposed near the first fitting portion 101 of the strap 93. The protrusion 93B is disposed near the second fitting portion 102 of the strap 93. The protrusions 93A and 93B engage and are engaged with the concave portion 72 of the hammer housing portion 3.

[0203] Specifically, as Figure 20 shown, a support rib 71 that contacts the inner peripheral surface of the strap 93 is formed on the strap fitting portion 70 of the hammer housing portion 3. A concave portion 72 is formed at a specified portion of the support rib 71. The concave portion 72 has a concave shape corresponding to the protrusions 93A and 93B. In the embodiment, the concave portion 72 has a V-shaped concave shape. By engaging the protrusions 93A and 93B with the concave portion 72, the deviation of the strap 93 in the rotational direction can be suppressed.

[0204] A plurality of concave portions 72 are provided along the outer periphery of the hammer housing portion 3 in the rotational direction. By engaging the protrusions 93A and 93B with any one of the concave portions 72, the assembly direction of the side handle 90 can be changed. The side handle 90 can be assembled relative to the grip portion 22, for example, in a direction that is 90 degrees or 180 degrees in the rotational direction. In the embodiment, the concave portions 72 can change the assembly direction at 45-degree intervals along the outer periphery of the hammer housing portion 3. When the handle portion 11 of the side handle 90 is assembled relative to the grip portion 22 in a 90-degree orientation to the left or right, it is disposed in the left or right direction relative to the hammer housing portion 3. When the handle portion 11 of the side handle 90 is assembled relative to the grip portion 22 in a 180-degree orientation, it is disposed in the upper direction relative to the hammer housing portion 3. When the handle portion 11 of the side handle 90 is assembled relative to the grip portion 22 in a 135-degree orientation to the left or right, it is disposed in the upper left diagonal direction or the upper right diagonal direction relative to the hammer housing portion 3.

[0205] In addition, the protrusions (protrusions 93A and 93B) and the concave portions 72 may not be provided. In this case, the friction between the strap 93 and the strap mounting portion 70 caused by the tightening force of the strap 93 is used to suppress the deviation in the rotational direction.

[0206] The strap 93 has a width W. A pair of locking ribs 73 are formed on the outer peripheral surface of the hammer housing portion 3. One of the pair of locking ribs 73 is provided on each of the front and rear sides of the strap mounting portion 70. In other words, the strap mounting portion 70 is formed in a groove shape 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 strap 93. The pair of locking ribs 73 are respectively opposed to the strap 93 disposed in the strap mounting portion 70 in the front and rear directions. When the strap 93 attempts to shift in the front and rear directions, the pair of locking ribs 73 come into contact with the end surfaces 93C in the width direction of the strap 93. The pair of locking ribs 73 can suppress the positional deviation of the strap 93 in the front and rear directions. 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 portion of the strap mounting portion 70 of the hammer housing portion 3.

[0207] When assembling the side handle 90, the operator rotates the fastening knob 99 in the loosening direction to disengage the engagement between the nut 98B and the bolt 98A, and then pulls out the bolt 98A. As a result, the strap 93 is separated from the handle base 91. The operator arranges the strap 93 in such a way that one end of the strap 93 passes through the inside of the annular handle portion 11 of the impact tool 1 and surrounds the periphery of the strap fitting portion 70. With the strap 93 arranged around the strap fitting portion 70, the operator installs the bolt 98A in such a way that it passes through the second holding portion 96, the second fitting portion 102, the first fitting portion 101, the cam member 97, and the fastening knob 99, and engages it with the nut 98B of the fastening knob 99. The operator rotates the fastening knob 99 in the fastening direction, causing the nut 98B to move along the central axis BX of the bolt 98A. As the nut 98B moves, the fastening knob 99 moves in a direction closer to the second holding portion 96. As the fastening knob 99 moves, the cam member 97 approaches the second holding portion 96 along the central axis BX of the bolt 98A. The first fitting portion 101 pressed by the cam member 97 approaches the second holding portion 96 along the central axis BX of the bolt 98A. As a result, the interval between the first fitting portion 101 and the second fitting portion 102 is reduced, and thus the inner diameter of the strap 93 is reduced. By reducing the inner diameter of the strap 93, the strap 93 fastens the hammer housing portion 3 and the connecting portion 25 at the portion of the strap fitting portion 70. The side handle 90 is fixed to the impact tool 1 by the fastening force of the strap 93. When disassembling the side handle 90, rotate the fastening knob 99 in the loosening direction as in the case of assembly to remove the bolt 98A.

[0208] In addition, in the embodiment, by using the fastening knob 99 to bring the cam member 97 closer to the second holding portion 96, the interval between the first fitting portion 101 and the second fitting portion 102 of the strap 93 is reduced. In addition, the interval between the first fitting portion 101 and the second fitting portion 102 of the strap 93 can also 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 identical to the cam engagement surface 97A, the insertion through-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 fastening force of the bolt 98A and by the fastening knob 99. Thereby, the handle base 91 can be elastically deformed to reduce the interval between the first holding portion 95 and the second holding portion 96. Alternatively, a cam member having the same structure as the cam member 97 provided in the first holding portion 95 can be provided in the second holding portion 96, and the first fitting portion 101 and the second fitting portion 102 can be clamped by the cam members respectively. An elastic body such as a coil spring can also be disposed between the fastening knob 99 and the cam member.

[0209] <Usage Method>

[0210] When an operator operates the trigger lever 14, the motor 6 starts, and light is emitted from the light-emitting body 52 of the light-emitting body unit 16. The light emitted from the light-emitting body unit 16 has a high brightness, so that the work object can be brightly illuminated. Even when the opposite-side handle 90 is assembled, the light-emitting body unit 16 is disposed at a front position of the side handle 90. The light emitted from the light-emitting body unit 16 is not blocked by the side handle 90.

[0211] On the other hand, when a part of the light emitted from the light-emitting body 52 diffuses to a degree more than necessary, the operator will feel dazzled, and it may be difficult to visually confirm 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-emitting body unit 16 is partially covered by the first protective cover 61 and the second protective cover 62, so that the light emission area is restricted. Accordingly, the situation where the operator feels dazzled can be suppressed.

[0212] In addition, even if, for example, the impact tool 1 falls down, the light-emitting body unit 16 is protected by the wall portion 3F of the hammer housing portion 3. Thereby, breakage of the light-emitting body unit 16 can be suppressed, and a reduction in the light-emitting performance of the light-emitting body unit 16 can be suppressed.

[0213] In addition, in order to increase the inertial force during the impact of the hammer as the maximum tightening torque of the impact tool 1 increases, the weight of the hammer housing portion 3 is increased. The greater the weight of the hammer housing portion 3, the greater the impact on the handle portion 11 when it falls. In the embodiment, the handle portion 11 below the hammer housing portion 3 has high mechanical strength due to the annular structure composed of the gripping portion 22, the support portion 24, the battery holding portion 23, and the connecting portion 25. Thus, even if the impact tool 1 falls, breakage of the handle portion 11 can be suppressed.

[0214] The value of the maximum tightening torque of the impact tool 1 is not particularly limited. For example, the maximum tightening torque of the impact tool 1 is 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 refers to the torque when fastening the work piece to be fastened. Generally speaking, it refers to the torque measured for the fastened work piece using a torque wrench, etc. In addition, it is not a method of measuring by loosening nuts or bolts. Generally, this maximum tightening torque is described in the catalogs of each manufacturer.

[0215] <Effect>

[0216] 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 gripping portion 22 that extends downward from the motor housing portion 21; a hammer 47 that rotates 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 gripping portion 22 and extends downward toward the motor housing portion 21 or the hammer housing portion 3; a battery holding portion 23 that is connected to the gripping portion 22 and the support portion 24, and to which the battery pack 80 can be detachably attached; and a light emitting unit 16 that is held at the front of the hammer housing portion 3 and has a plurality of light emitters 52 in the rotational direction around the anvil 10. A wire 60 electrically connected to the light emitting unit 16 passes through the inside of the support portion 24.

[0217] According to the above configuration, in the impact tool 1 having the support portion 24, the light-emitting unit 16 having a plurality of light-emitting bodies 52 in the circumferential rotation direction around the anvil 10 is held at the front portion of the hammer housing portion 3. Therefore, the illumination of the periphery of the anvil 10 can be appropriately performed. In addition, the support portion 24 is used as a passage for the wire 60, so there is no need to increase the size of the structure of the impact tool 1 in order to pass the wire 60. Accordingly, an increase in the size of the impact tool 1 caused by the illumination wiring can be suppressed. Since the wire 60 is arranged in the support portion 24 as a support structure, the assembly operation of arranging the wire 60 becomes easier compared to the case where the wire 60 is arranged in a space where a plurality of components are concentrated. Accordingly, a reduction in the assembly operation can be suppressed.

[0218] In the embodiment, the hammer housing portion 3 has a front surface portion 3C provided with the light-emitting unit 16. The support portion 24 is provided to extend downward from the front surface portion 3C of the hammer housing portion 3.

[0219] According to the above configuration, the light-emitting unit 16 can be brought close to the support portion 24. The portion for guiding the wire 60 between the light-emitting unit 16 and the support portion 24 can be reduced, or the portion for guiding the wire 60 can be omitted. Therefore, an increase in the size of the impact tool 1 caused by the illumination wiring can be suppressed. In addition, even when the hammer housing portion 3 becomes larger in the large impact tool 1, by arranging the support portion 24 at a position below the front surface portion 3C of the hammer housing portion 3, the impact resistance can be effectively improved.

[0220] In the embodiment, the hammer housing portion 3 has a wall portion 3F that surrounds the outer periphery of the light-emitting unit 16.

[0221] According to the above configuration, the light-emitting unit 16 can be protected from external collisions by the wall portion 3F.

[0222] In the embodiment, the wall portion 3F extends to the same position as the front surface of the light-emitting unit 16 or a position further forward than the front surface of the light-emitting unit 16.

[0223] According to the above configuration, the light-emitting unit 16 does not protrude further forward than the wall portion 3F, so the light-emitting unit 16 can be effectively protected.

[0224] In the embodiment, the light-emitting unit 16 is formed in a surrounding shape so as to surround the anvil 10.

[0225] According to the above configuration, light can be irradiated from the light-emitting unit 16 over a large range around the anvil 10. Illumination of the front-end tool or the working portion assembled to the anvil 10 can be effectively performed.

[0226] In an embodiment, the hammer housing portion 3 has a front cylinder portion 3B in which an anvil bearing 46 that supports the anvil 10 in the rotational direction is disposed. At least a part of the light-emitting unit 16 is disposed at a position between the outer peripheral surface 3E of the hammer housing portion 3 and the front cylinder portion 3B.

[0227] According to 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. Accordingly, an increase in the size of the impact tool 1 can be suppressed.

[0228] In an embodiment, the support column portion 24 is disposed at a position directly below the light-emitting unit 16. The light-emitting unit 16 has a convex portion 55D that enters the inside of the support column portion 24.

[0229] According to the above configuration, since the convex portion 55D of the light-emitting unit 16 is disposed inside the support column portion 24, the wire 60 extending from the light-emitting unit 16 can directly enter the inside of the support column portion 24. There is no need to provide a component for guiding between the light-emitting unit 16 and the support column portion 24, so an increase in the size of the impact tool 1 can be suppressed.

[0230] In an embodiment, the battery holding portion 23 has a controller 17 that controls the light-emitting unit 16. The 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.

[0231] According to 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 path for the wire 60, the wiring structure can be simplified and the number of components can be reduced.

[0232] In an embodiment, the light-emitting unit 16 includes an optical member 55 that is disposed to cover the front sides of a plurality of light emitters 52 and diffuses the light of the plurality of light emitters 52. The optical member 55 is continuous across the plurality of light emitters 52.

[0233] According to the above configuration, the light-emitting unit 16 can emit light in a planar shape rather than a point shape through the optical member 55. The deviation in brightness in the light emission direction can be reduced, so the illumination around the anvil 10 can be performed more appropriately.

[0234] In an embodiment, the impact tool 1 includes a connecting portion 25 that connects the upper end of the grip portion 22 and the upper end of the support column portion 24. A ring-shaped handle portion 11 is formed by the grip portion 22, the support column portion 24, the battery holding portion 23, and the connecting portion 25.

[0235] According to the above configuration, the gripping portion 22, the support portion 24, the battery holding portion 23, and the connecting portion 25 support each other through the annular handle portion 11. Therefore, the impact resistance of the handle portion 11 can be effectively improved.

[0236] In the embodiment, the impact tool 1 includes: a motor 6; a motor housing portion 21 that houses the motor 6; a gripping portion 22 that extends downward from the motor housing portion 21; a hammer 47 that rotates 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 gripping portion 22 and extends downward toward the motor housing portion 21 or the hammer housing portion 3; a battery holding portion 23 that is connected to the gripping portion 22 and the support portion 24, and to which a battery pack 80 can be detachably attached; a side handle 90 that can be detachably attached to the hammer housing portion; and a light emitting unit 16 that is disposed in front of the side handle 90.

[0237] According to the above configuration, the side handle 90 can be detachably attached to the hammer housing portion 3 that houses the hammer 47. Therefore, the side handle 90 can be brought close to the heavy components (the hammer 47 and the hammer housing portion 3). Accordingly, in the impact tool 1 having the side handle 90, good balance can be ensured. Further, 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 is not obstructed by the side handle 90 and the light can be transmitted to the periphery of the anvil 10. Accordingly, the periphery of the anvil 10 can be appropriately illuminated.

[0238] In the embodiment, the hammer housing portion 3 has an annular and concave setting portion 3D that houses the light emitting unit 16.

[0239] According to the above configuration, the annular light emitting unit 16 can be compactly provided in the hammer housing portion 3. Accordingly, the enlargement of the impact tool 1 can be suppressed.

[0240] In the embodiment, the impact tool 1 includes a buffer member 57 disposed at a position between the hammer housing portion 3 and the light emitting unit 16. The buffer member 57 covers at least one of the rear surface of the light emitting unit 16, the inner peripheral surface of the light emitting unit 16, and the outer peripheral surface 3E.

[0241] According to the above configuration, even when the light emitting unit 16 is provided in the hammer housing portion 3 that vibrates due to impact during the use of the impact tool 1, the light emitting unit 16 can be effectively protected from the vibration by the buffer member 57.

[0242] In an embodiment, the light-emitting unit 16 is held by the hammer housing portion 3 via a buffer member 57 at the installation portion 3D in a state of not contacting the hammer housing portion 3.

[0243] According to the above configuration, since the light-emitting unit 16 does not directly contact the hammer housing portion 3, it is possible to prevent the occurrence of wear and the like of the light-emitting unit 16 caused by the vibration of the hammer housing portion 3.

[0244] In an embodiment, the hammer housing portion 3 has a wall portion 3F that forms the outer periphery of the installation portion 3D. The wall portion 3F has a slit 3G that connects the light-emitting unit 16 to the inside of the support column portion 24 and allows the wire 60 to pass through.

[0245] According to the above configuration, the light-emitting unit 16 can be protected by the wall portion 3F from external collisions. The wire 60 can easily enter the inside of the support column portion 24 from the light-emitting unit 16 through the slit 3G of the wall portion 3F.

[0246] In an embodiment, the impact tool 1 includes a guiding portion GD that guides the wire 60 passing through the slit 3G so that it does not contact the hammer housing portion 3.

[0247] According to the above configuration, the guiding portion GD can protect the wire 60 from the vibration generated on the hammer housing portion 3.

[0248] In an embodiment, the light-emitting unit 16 has a convex portion 55D that passes through the slit 3G and enters the inside of the support column portion 24. The impact tool 1 includes a buffer member 57 disposed at a position between the hammer housing portion 3 and the light-emitting unit 16. The guiding portion GD is formed by a passage portion surrounded by the buffer member 57 and the convex portion 55D inside the slit 3G.

[0249] According to the above configuration, the buffer member 57 can effectively protect the light-emitting unit 16 from vibration. The guiding portion GD can be formed by using a part (convex portion 55D) of the light-emitting unit 16 and the buffer member 57. Accordingly, compared with the case where the guiding portion GD is provided independently of the buffer member 57, the number of components can be reduced.

[0250] In an embodiment, the impact tool 1 includes an annular first protective cover 61 that 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.

[0251] According to the above configuration, the first protective cover 61 can mitigate the impact when colliding with an external object when using the impact tool 1.

[0252] In an embodiment, the hammer housing portion 3 has a front cylinder portion 3B that forms the inner peripheral surface of the setting portion 3D and surrounds the anvil 10. The impact tool 1 includes an annular second protective cover 62 that covers the front cylinder portion 3B and the inner peripheral portion of the front surface 16A of the light-emitting unit 16.

[0253] According to the above configuration, the second protective cover 62 can mitigate the impact when the impact tool 1 collides with an external object during use. By using the first protective cover 61 and the second protective cover 62 to cover the outer peripheral portion and the inner peripheral portion of the front surface 16A of the light-emitting unit 16, the light emission area of the light-emitting unit 16 can be ensured, and the light-emitting unit can be effectively protected.

[0254] In an embodiment, the impact tool 1 includes a motor 6; a motor housing portion 21 that houses the motor 6; a hammer 47 that rotates 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; an annular light-emitting unit 16 that is disposed at the front portion of the hammer housing portion 3 and surrounds the anvil 10; and an annular handle portion 11 that is disposed at a position below the motor housing portion 21 and the hammer housing portion 3.

[0255] According to the above configuration, a part of the annular handle portion 11 can function as a grip portion 22, and another part of the annular handle portion 11 can function as a support portion 24. Since the annular light-emitting unit 16 that surrounds the anvil 10 is disposed at the front portion of the hammer housing portion 3, the periphery of the anvil 10 can be appropriately illuminated. Thus, in the impact tool 1 having the support portion 24, the periphery of the anvil 10 can be appropriately illuminated.

[0256] [Other Embodiments]

[0257] In the above embodiment, the setting portion 3D may not be annular, and a plurality of them may be provided at intervals around the anvil shaft portion 10C. Sheet-like light-emitting bodies and optical components may be respectively disposed in the plurality of setting portions 3D.

[0258] In the above embodiment, the light-emitting unit 16 has a COB lamp 50. The light-emitting unit 16 may also have a lamp other than the COB lamp. The light-emitting unit 16 only needs to have a plurality of light-emitting bodies.

[0259] In the above embodiment, the impact tool 1 is an impact wrench. The impact tool 1 may also be an impact screwdriver. In this case, the impact tool 1 includes an anvil 10 formed with a fitting hole for fitting a screwdriver bit as a front-end tool.

[0260] In the above-described embodiment, the power source of the impact tool 1 may not be the battery pack 80, but may also be a commercial power source (alternating current power source).

Claims

1. An impact tool, characterized in that, the impact tool comprises: a motor; a motor housing portion that houses the motor; a grip portion that extends downward from the motor housing portion; a hammer that rotates by the motor; an anvil that is struck in the rotational direction by the hammer; a hammer housing portion that houses the hammer; a support portion that is disposed in front of the grip portion and extends downward toward the motor housing portion or below the hammer housing portion; a battery holder that is connected between the grip portion and the support portion, and a battery pack can be detached and attached relative to the battery holder; and a light-emitting unit that is held at the front of the hammer housing portion and has a plurality of light-emitting elements in the rotational direction around the anvil, a wire electrically connected to the light-emitting unit passes through the inside of the support portion.

2. The impact tool according to claim 1, characterized in that, the hammer housing portion has a front surface portion where the light-emitting unit is provided, the support portion is provided to extend downward from the front surface portion of the hammer housing portion.

3. The impact tool according to claim 1, characterized in that, the hammer housing portion has a wall portion that surrounds the outer periphery of the light-emitting unit.

4. The impact tool according to claim 3, characterized in that, the wall portion extends to a position that is the same as the front surface of the light-emitting unit or a position that is more forward than the front surface of the light-emitting unit.

5. The impact tool according to claim 1, characterized in that, the light-emitting unit is formed in a surrounding shape so as to surround the anvil.

6. The impact tool according to claim 5, characterized in that, the hammer housing portion has a front cylindrical portion where an anvil bearing for supporting the anvil in the rotational direction is disposed, at least a part of the light-emitting unit is disposed at a position between the outer peripheral surface of the hammer housing portion and the front cylindrical portion.

7. The impact tool according to claim 1, characterized in that, the support portion is disposed directly below the light-emitting unit, the light-emitting unit has a convex portion that enters the inside of the support portion.

8. The impact tool according to claim 1, characterized in that, the battery holder has a controller that controls the light-emitting unit, the wire passes through from the upper end portion to the lower end portion of the support portion and is connected to the controller.

9. The impact tool according to claim 1, characterized in that, the light-emitting unit includes an optical member that is configured to cover the front sides of the plurality of light-emitting elements and diffuses the light of the plurality of light-emitting elements, the optical member is continuous across the plurality of light-emitting elements.

10. The impact tool according to claim 1, characterized in that, the impact tool further comprises a connecting portion that connects the upper end of the grip portion and the upper end of the support portion, A ring-shaped handle portion is formed by the gripping portion, the support portion, the battery holding portion, and the connecting portion.

11. An impact tool, characterized in that the impact tool includes: a motor; a motor housing portion that houses the motor; a gripping portion that extends downward from the motor housing portion; a hammer that rotates by the motor; an anvil that is struck in the rotational direction by the hammer; a hammer housing portion that houses the hammer; a support portion that is disposed in front of the gripping portion and extends downward toward the motor housing portion or the hammer housing portion; a battery holding portion that is connected to the gripping portion and the support portion, and to which a battery pack can be detachably attached; a side handle that can be detachably attached to the hammer housing portion; and a light-emitting unit that is disposed in front of the side handle.

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

13. The impact tool according to claim 12, characterized in that the impact tool further includes a buffer member disposed at a position between the hammer housing portion and the light-emitting unit, the buffer member covering at least one of the rear surface of the light-emitting unit, the inner circumferential surface, and the outer circumferential surface of the light-emitting unit.

14. The impact tool according to claim 13, characterized in that the light-emitting unit is held by the hammer housing portion via the buffer member at the setting portion in a state of not being in contact with the hammer housing portion.

15. The impact tool according to claim 12, characterized in that the hammer housing portion has a wall portion that forms the outer circumference of the setting portion, the wall portion having a slit that connects the light-emitting unit to the inside of the support portion and through which a wire passes.

16. The impact tool according to claim 15, characterized in that the impact tool further includes a guiding portion that guides the wire passing through the slit so as not to contact the hammer housing portion.

17. The impact tool according to claim 16, characterized in that the light-emitting unit has a convex portion that passes through the slit and enters the inside of the support portion, the impact tool further includes a buffer member disposed at a position between the hammer housing portion and the light-emitting unit, the guiding portion being formed by a passage portion surrounded by the buffer member and the convex portion inside the slit.

18. The impact tool according to claim 15, characterized in that the impact tool further includes 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.

19. The impact tool according to claim 18, characterized in that The hammer housing portion has a front cylinder portion that forms the inner peripheral surface of the mounting portion and surrounds the anvil. The impact tool further includes a ring-shaped second protective cover that covers the front cylinder portion and the inner peripheral portion of the front surface of the light-emitting unit.

20. An impact tool, characterized in that The impact tool includes: A motor; A motor housing portion that houses the motor; A hammer that rotates by the motor; An anvil that is struck in the rotational direction by the hammer; A hammer housing portion that houses the hammer; A ring-shaped light-emitting unit that is disposed at the front portion of the hammer housing portion and surrounds the anvil; and A ring-shaped handle portion that is disposed below the motor housing portion and the hammer housing portion.

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