Impact tool

Abstract

To achieve high strength and weight reduction of an impact tool.SOLUTION: An impact tool includes: a motor; a deceleration mechanism rotated by the motor; a hammer rotated by rotation of the motor transmitted through the deceleration mechanism; an anvil stroke in a rotation direction by the hammer; a motor case storing the motor; and a gear case storing the deceleration mechanism. One or both of the motor case and the gear case are made of a magnesium alloy.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

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

[0003] [Patent Document 1] U.S. Patent No. 8,496,366 Summary of the Invention [Problem to be solved by the invention]

[0004] As impact tools become more powerful, the components of the impact tool are subjected to a large impact when the hammer strikes the anvil. To withstand the impact, the components must be made of high-strength materials, but if the specific gravity of the high-strength material is high, the weight of the impact tool increases, which may lead to a decrease in workability.

[0005] The technology disclosed in this specification aims to achieve both high strength and light weight for an impact tool. [Means for solving the problem]

[0006] This specification discloses an impact tool. The impact tool includes a motor, a reduction mechanism rotated by the motor, a hammer rotated by rotation of the motor transmitted via the reduction mechanism, an anvil struck by the hammer in the rotational direction, a motor case that houses the motor, and a gear case that houses the reduction mechanism. One or both of the motor case and the gear case are made of a magnesium alloy. [Effects of the Invention]

[0007] According to the technology disclosed in this specification, it is possible to achieve both high strength and light weight for an impact tool. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of an impact tool according to an embodiment, seen from the left front side. [Figure 2] FIG. 2 is a perspective view showing the impact tool according to the embodiment, seen from the right rear side. [Figure 3] FIG. 3 is a view of the impact tool according to the embodiment as seen from the right side. [Figure 4] FIG. 4 is a view of the impact tool according to the embodiment as seen from the left side. [Figure 5] FIG. 5 is a view of the impact tool according to the embodiment as seen from the rear side. [Figure 6] FIG. 6 is a view of the impact tool according to the embodiment as seen from the front side. [Figure 7] FIG. 7 is a view of the impact tool according to the embodiment as seen from above. [Figure 8] FIG. 8 is a view of the impact tool according to the embodiment as seen from below. [Figure 9] FIG. 9 is a cross-sectional view showing an impact tool according to the embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing an impact tool according to an embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 12] FIG. 12 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 14] FIG. 14 is an exploded perspective view showing the light assembly according to the embodiment, as seen from the right front side. [Figure 15] FIG. 15 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 16] FIG. 16 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 17] FIG. 17 is an exploded perspective view showing the battery housing and the battery holder according to the embodiment, as seen from the right front side. [Figure 18] FIG. 18 is a view of a part of the impact tool according to the embodiment as seen from the right side. [Figure 19] FIG. 19 is a perspective view showing a part of the impact tool according to the embodiment, seen from the right front side. [Figure 20] FIG. 20 is a perspective view showing a part of the impact tool according to the embodiment, seen from the lower right rear side. [Figure 21] FIG. 21 is an exploded perspective view showing a part of the impact tool according to the embodiment, seen from the right front side. [Figure 22] FIG. 22 is an exploded perspective view showing a part of the impact tool according to the embodiment, seen from the left rear side. [Figure 23] FIG. 23 is an exploded perspective view showing the motor case and the baffle plate according to the embodiment, as seen from the right front side. [Figure 24] FIG. 24 is a diagram of the motor case, inner member, and stator according to the embodiment, viewed from above. [Figure 25] FIG. 25 is a view of the motor case, inner member, and stator according to the embodiment, viewed from the lower right rear side. [Figure 26] FIG. 26 is an exploded perspective view showing the motor case, inner member, and stator according to the embodiment, as viewed from the right front side. [Figure 27] FIG. 27 is an exploded perspective view showing the motor case, inner member, and stator according to the embodiment, as viewed from the rear left side. [Figure 28] FIG. 28 is an exploded perspective view showing the motor case, inner member, and stator according to the embodiment, as viewed from the lower right rear side. [Figure 29] FIG. 29 is an exploded perspective view showing the gear case and the bearing cover according to the embodiment, as viewed from the right rear side. [Figure 30]FIG. 30 is a view of the impact tool according to the embodiment as seen from the right side. [Figure 31] FIG. 31 is a diagram showing an example of how to hold the grip portion according to the embodiment. [Figure 32] FIG. 32 is a diagram showing an example of how to grip the grip portion according to the embodiment. [Figure 33] FIG. 33 is a perspective view showing the interface panel according to the embodiment, seen from the right rear side. [Figure 34] FIG. 34 is a perspective view from the right rear side for explaining the holding structure of the interface panel according to the embodiment. [Figure 35] FIG. 35 is an exploded perspective view showing the interface panel according to the embodiment, seen from the right rear side. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, the impact tool includes a motor, a reduction mechanism rotated by the motor, a hammer rotated by the rotation of the motor transmitted via the reduction mechanism, an anvil struck by the hammer in the rotational direction, a motor case that houses the motor, and a gear case that houses the reduction mechanism, wherein one or both of the motor case and the gear case are made of a magnesium alloy.

[0010] In the above configuration, since one or both of the motor case and the gear case are made of a magnesium alloy, the impact tool can be made both strong and lightweight. The strength of magnesium alloy is higher than that of synthetic resin. The specific gravity of magnesium alloy is lower than that of aluminum.

[0011] In one or more embodiments, the motor case includes a holder mechanism that holds the first lead wire that passes outside the motor case.

[0012] In the above configuration, the first lead wire is held by the holder mechanism, which improves the ease of assembling the impact tool.

[0013] In one or more embodiments, the first lead is not connected to the motor.

[0014] In the above configuration, the first lead wire that is not connected to the motor is held by the holder mechanism, and power is supplied to an electronic device separate from the motor via the first lead wire.

[0015] In one or more embodiments, the impact tool includes a controller, and the first lead is connected to the controller.

[0016] In the above configuration, the first lead wire that is not connected to the controller is held by the holder mechanism.

[0017] In one or more embodiments, the controller is located rearward of the motor case, and the first lead is connected to an electronic component located forward of the motor case.

[0018] In the above configuration, power is supplied to the electronic components arranged forward of the motor case via the first lead wire.

[0019] In one or more embodiments, the impact tool includes a light emitter unit including a light emitter that illuminates the front end side of the anvil, and the electronic component includes an LED chip of the light emitter unit.

[0020] In the above configuration, power is supplied to the LED chip disposed forward of the motor case via the first lead wire, and the LED chip emits light when power is supplied via the first lead wire.

[0021] In one or more embodiments, the impact tool includes a connector disposed forward of the motor case and configured to energize the light source unit. A rear end of the first lead wire is connected to the controller. A front end of the first lead wire is connected to the connector. A holder mechanism holds an intermediate portion of the first lead wire.

[0022] In the above configuration, the intermediate portion of the first lead wire that connects the controller and the connector is held by the holder mechanism.

[0023] In one or more embodiments, the holder mechanism has a base rib provided on the outer surface of the motor case and supporting the first lead wire from below, and a hook rib positioned above the base rib on the outer surface of the motor case and supporting the first lead wire from the side.

[0024] In the above configuration, the first lead wire is held by the base rib and the hook rib.

[0025] In one or more embodiments, the motor case has a cylindrical portion disposed around the motor, a lower wall portion disposed at the lower end of the cylindrical portion, and a protrusion portion protruding laterally from an upper portion of the outer peripheral surface of the cylindrical portion. The base rib protrudes from the side surface of the cylindrical portion below the protrusion. The hook rib protrudes downward from the lower surface of the protrusion.

[0026] In the above configuration, the relative positions of the base rib and the hook rib are optimized so as to be able to hold the first lead wire.

[0027] In one or more embodiments, the impact tool includes a fan fixed to an upper portion of the rotor shaft of the motor, and a baffle plate disposed at the upper end of the motor case and facing the fan. The baffle plate has an annular base portion inserted into an opening at the upper end of the cylindrical portion, and a screw boss provided on the periphery of the base portion. The protrusion has an upper recess into which the screw boss is inserted when the base portion is inserted into the opening at the upper end of the cylindrical portion.

[0028] In the above configuration, the base portion is inserted into the opening at the upper end of the cylindrical portion, and the screw boss is inserted into the upper recess of the protrusion, so the amount of protrusion of the baffle plate upward from the motor case is small, which prevents the impact tool from becoming too large.

[0029] In one or more embodiments, a screw inserted into an opening in the screw boss is coupled to a threaded hole in the upper recess.

[0030] In the above configuration, the motor case and the baffle plate are fixed together with screws. The screws are positioned inside the upper recess, so the amount of the screws protruding upward from the baffle plate is small. This prevents the impact tool from becoming too large.

[0031] In one or more embodiments, the motor case has a cylindrical portion disposed around the motor and a lower wall portion disposed at a lower end of the cylindrical portion. The impact tool includes an inner member made of synthetic resin disposed between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of a stator core of the motor.

[0032] In the above configuration, contact between the magnesium alloy motor case and the iron stator core is suppressed by the synthetic resin inner member, thereby suppressing wear of the motor case.

[0033] In one or more embodiments, the inner member has an annular base portion disposed between the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the stator core of the motor, an outer protrusion protruding radially outward from the outer circumferential surface of the base portion, and an inner protrusion protruding radially inward from the inner circumferential surface of the base portion. An inner recess into which the outer protrusion is inserted is provided on the inner circumferential surface of the cylindrical portion. A groove into which the inner protrusion is inserted is provided on the outer circumferential surface of the stator core.

[0034] In the above configuration, the inner convex portion is inserted into the groove, thereby preventing the relative position between the stator and the inner member from changing in the rotation direction, and the outer convex portion is inserted into the inner recess, thereby preventing the relative position between the inner member and the motor case from changing in the rotation direction.

[0035] In one or more embodiments, the impact tool includes a controller disposed on the rear side of the motor case and controlling the motor, and a sensor board housed in the motor case and detecting the rotational position of the motor's rotor. The motor case has a cylindrical portion disposed around the motor and a bottom wall portion disposed at the bottom end of the cylindrical portion. The motor's stator has a stator core and a power terminal disposed inside the motor case and on the rear side of the stator core. The sensor board is disposed inside the motor case and below the stator core. A first opening is provided in the rear of the cylindrical portion. A second opening is provided in the rear of the bottom wall portion. A second lead wire connecting the power terminal and the controller passes through the first opening. A third lead wire connecting the sensor board and the controller passes through the second opening.

[0036] In the above configuration, the second lead wire passes through the first opening provided in the rear part of the cylindrical portion, thereby preventing the second lead wire from being excessively bent or from being subjected to excessive tension.The third lead wire passes through the second opening provided in the rear part of the lower wall portion, thereby preventing the third lead wire from being excessively bent or from being subjected to excessive tension.

[0037] In one or more embodiments, the motor case has a reinforcing rib provided at the boundary between the first opening and the second opening and integral with the cylindrical portion and the bottom wall portion.

[0038] In the above configuration, the reinforcing rib is disposed at the boundary between the first opening and the second opening, thereby preventing a decrease in the strength of the motor case.

[0039] In one or more embodiments, the impact tool includes a main housing made of synthetic resin that houses a motor case. The anvil rotates about an output rotation shaft that extends in the front-to-rear direction. The overall length, which is the distance in the front-to-rear direction between the front end of the anvil and the rear end of the main housing, is 440 mm or less.

[0040] With the above configuration, the impact tool is prevented from becoming large, and the workability of work using the impact tool is improved.

[0041] In one or more embodiments, the main body housing has a main body portion that houses the motor case, a grip portion disposed on the rear side of the main body portion, and a controller storage portion disposed below the grip portion. The grip portion includes a rear grip portion extending upward from the rear of the controller storage portion, and an upper grip portion extending forward from the upper end of the rear grip portion. The front end of the upper grip portion is connected to the top of the main body portion. The space length, which indicates the maximum dimension in the front-to-rear direction of the space enclosed by the grip portion, main body portion, and controller storage portion, is 90 mm or more.

[0042] With the above configuration, when gripping the grip portion, the worker can easily grasp only the rear grip portion, or a part of the rear grip portion and a part of the upper grip portion at the same time. Furthermore, when gripping the grip portion, there is little interference between the fingers and the main body, making it easy to grip. Various gripping methods are possible depending on the work situation, improving operability.

[0043] In one or more embodiments, the upper end of the motor case and the lower end of the gear case are fastened together by screws.

[0044] In the above configuration, the motor case and the gear case, which are arranged in the vertical direction, are fixed together by screws.

[0045] In one or more embodiments, the rotor of the motor rotates around a motor rotation shaft extending in the up-down direction, and the reduction mechanism includes a first bevel gear that rotates around the motor rotation shaft, and a second bevel gear that meshes with the first bevel gear and rotates around an output rotation shaft extending in the front-rear direction.

[0046] In the above configuration, the motor rotation shaft and the output rotation shaft are perpendicular to each other, so that the overall length of the impact tool can be shortened.

[0047] In one or more embodiments, the impact tool includes a hammer case disposed on the front side of the gear case and housing a hammer, both the motor case and the hammer case being made of magnesium alloy, and the hammer case being made of aluminum.

[0048] In the above configuration, both the motor case and the hammer case are made of magnesium alloy, which makes them strong and lightweight. The hammer case is made of aluminum, which is stronger than magnesium alloy, so it can withstand a large impact when the hammer strikes the anvil.

[0049] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0050] In the embodiment, the positional relationship of each part will be described using the terms "left," "right," "front," "rear," "upper," and "lower." These terms indicate relative positions or directions based on the center of the impact tool 1. The left-right direction, the front-rear direction, and the up-down direction are perpendicular to each other.

[0051] The impact tool 1 has a motor 10 and an anvil 16, which is the output section of the impact tool 1. The rotation axis of the motor 10 will be referred to as the motor rotation axis MX, and the rotation axis of the anvil 16 will be referred to as the output rotation axis AX. The motor rotation axis MX extends in the up-down direction. The output rotation axis AX extends in the front-rear direction. The motor rotation axis MX and the output rotation axis AX are perpendicular to each other.

[0052] The direction parallel to the output rotation axis AX will be referred to as the axial direction, the direction circumferentially around the output rotation axis AX will be referred to as the circumferential direction or rotational direction, and the radial direction of the output rotation axis AX will be referred to as the radial direction. In addition, in the radial direction, the position closer to or approaching the output rotation axis AX will be referred to as the radially inner direction, and the position farther from or away from the output rotation axis AX will be referred to as the radially outer direction.

[0053] [Impact tools] FIG. 1 is a perspective view of an impact tool 1 according to an embodiment, viewed from the left front side. FIG. 2 is a perspective view of the impact tool 1 according to an embodiment, viewed from the right rear side. FIG. 3 is a view of the impact tool 1 according to an embodiment, viewed from the right side. FIG. 4 is a view of the impact tool 1 according to an embodiment, viewed from the left side. FIG. 5 is a view of the impact tool 1 according to an embodiment, viewed from the rear side. FIG. 6 is a view of the impact tool 1 according to an embodiment, viewed from the front side. FIG. 7 is a view of the impact tool 1 according to an embodiment, viewed from above. FIG. 8 is a view of the impact tool 1 according to an embodiment, viewed from below. FIG. 9 is a cross-sectional view of the impact tool 1 according to an embodiment, corresponding to the cross-sectional view taken along line BB in FIG. 7. FIG. 10 is a cross-sectional view of the impact tool 1 according to an embodiment, corresponding to the cross-sectional view taken along line AA in FIG. 3. FIG. 11 is a cross-sectional view of a portion of the impact tool according to an embodiment, corresponding to an enlarged view of a portion of FIG. 9. FIG. 12 is a cross-sectional view of a portion of the impact tool 1 according to an embodiment, corresponding to an enlarged view of a portion of FIG. 9. FIG. 13 is a cross-sectional view of a portion of the impact tool 1 according to an embodiment, corresponding to an enlarged view of a portion of FIG. 12.

[0054] The impact tool 1 is a type of power tool driven by an electric motor 10. In the embodiment, the impact tool 1 is an impact wrench, which is a type of fastening tool. The impact tool 1 includes a main body housing 2, a battery housing 3, a motor case 4, a gear case 5, a hammer case 6, a side handle 7, a rear bumper 8, a front bumper 120, a battery holder 9, a motor 10, a controller 11, a fan 12, a reduction mechanism 13, a spindle 14, a striking mechanism 15, an anvil 16, a trigger switch 17, a forward / reverse rotation switch lever 29, a light assembly 18, an interface panel 19, and a hook assembly 20.

[0055] The main body housing 2 accommodates the motor case 4. The main body housing 2 accommodates a part of the gear case 5. The main body housing 2 is connected to the battery housing 3. The main body housing 2 is fixed to the hammer case 6.

[0056] The main body housing 2 is made of synthetic resin. An example of the synthetic resin that forms the main body housing 2 is nylon resin. The main body housing 2 includes a left main body housing 2L and a right main body housing 2R. The right main body housing 2R is located to the right of the left main body housing 2L. The left main body housing 2L and the right main body housing 2R form a pair of half housings. The left main body housing 2L and the right main body housing 2R are fixed together with a plurality of screws 2S.

[0057] The main body housing 2 has a main body portion 21 , a protruding portion 22 , a grip portion 23 , a controller accommodating portion 24 , and a panel holding portion 25 .

[0058] The main body 21 accommodates the motor case 4. The main body 21 accommodates a part of the gear case 5.

[0059] The protrusion 22 protrudes downward from the main body 21. The protrusion 22 is disposed on the front side of the battery housing 3.

[0060] The grip portion 23 is held by the operator. The grip portion 23 is disposed on the rear side of the main body 21. The grip portion 23 includes a rear grip portion 23A extending upward from the rear portion of the controller housing portion 24, and an upper grip portion 23B extending forward from the upper end portion of the rear grip portion 23A. The lower end portion of the rear grip portion 23A is connected to the controller housing portion 24. The upper end portion of the rear grip portion 23A is connected to the rear end portion of the upper grip portion 23B. The front end portion of the upper grip portion 23B is connected to the upper portion of the main body 21. The grip portion 23, the main body 21, and the controller housing portion 24 form a D-shaped handle. The D-shaped handle is disposed on the rear side of the motor 10. The trigger switch 17 is disposed on the upper portion of the rear grip portion 23A.

[0061] The controller housing portion 24 houses the controller 11. The controller housing portion 24 is disposed below the rear grip portion 23A. The controller housing portion 24 is disposed rearward of the main body portion 21 and the panel holding portion 25.

[0062] The panel holding portion 25 holds the interface panel 19. The panel holding portion 25 is arranged to extend upward and forward from the front of the controller housing portion 24. The panel holding portion 25 is arranged on the rear side of the main body portion 21.

[0063] The battery housing 3 supports the battery holder 9. The battery housing 3 is connected to the main body housing 2 so as to be movable relative to the main body housing 2. The battery housing 3 is made of synthetic resin. An example of the synthetic resin that forms the battery housing 3 is nylon resin.

[0064] The battery housing 3 is disposed below the controller accommodating portion 24. The battery housing 3 is disposed behind the protruding portion 22. The battery housing 3 is connected to the D-shaped handle.

[0065] The battery housing 3 includes a left battery housing 3L and a right battery housing 3R. The right battery housing 3R is located to the right of the left battery housing 3L. The left battery housing 3L and the right battery housing 3R form a pair of half-split housings. The left battery housing 3L and the right battery housing 3R are fixed together with a plurality of screws 3S. The battery holder 9 is sandwiched between the left battery housing 3L and the right battery housing 3R.

[0066] The motor case 4 houses the motor 10. The motor case 4 is disposed below the gear case 5. The motor case 4 is fixed to the gear case 5.

[0067] The motor case 4 is made of a magnesium alloy. An example of the magnesium alloy that can be used to form the motor case 4 is MDC1D, an Mg—Al—Zn-based magnesium alloy. The motor case 4 is manufactured by die casting.

[0068] The motor case 4 has a cylindrical portion 4A arranged around the motor 10, and a lower wall portion 4B arranged at the lower end of the cylindrical portion 4A.

[0069] The gear case 5 accommodates at least a part of the reduction mechanism 13. The gear case 5 is disposed rearward of the hammer case 6. The hammer case 6 is disposed forward of the gear case 5. The gear case 5 is fixed to the hammer case 6.

[0070] The gear case 5 is made of a magnesium alloy. An example of the magnesium alloy that forms the gear case 5 is MDC1D, which is an Mg—Al—Zn-based magnesium alloy. The gear case 5 is manufactured by die casting.

[0071] The gear case 5 is substantially cylindrical. An opening is provided in the front part of the gear case 5. An opening is provided in the rear part of the gear case 5. An opening is provided in the bottom part of the gear case 5. A bearing cover 40 is disposed in the opening in the rear part of the gear case 5. As shown in Figures 11 and 29, the bearing cover 40 is fixed to the rear part of the gear case 5 with screws 40S. As shown in Figure 29, a screw boss 40A is provided on the periphery of the bearing cover 40. A screw 40S is inserted into an opening provided in the screw boss 40A. The screw 40S is inserted into a screw hole 5C provided in the rear end part of the gear case 5. The screw 40S is inserted into an opening 40B of the screw boss 40A from the rear side of the screw boss 40A, and then inserted into the screw hole 5C of the gear case 5.

[0072] The hammer case 6 houses the striking mechanism 15 including the hammer 71. The hammer case 6 is connected to the front of the main body housing 2. The hammer case 6 is connected to the front of the gear case 5.

[0073] The hammer case 6 is made of aluminum.

[0074] The hammer case 6 is substantially cylindrical. As shown in FIGS. 12 and 13 , the hammer case 6 has a first cylindrical portion 61, a second cylindrical portion 62, a front wall portion 63, and an annular rib portion 64. The first cylindrical portion 61 is disposed around the striking mechanism 15 including the hammer 71. The second cylindrical portion 62 is disposed forward of the first cylindrical portion 61. The outer diameter of the second cylindrical portion 62 is smaller than the outer diameter of the first cylindrical portion 61. The front end of the gear case 5 is inserted into an opening provided at the rear end of the first cylindrical portion 61. The front wall portion 63 connects the front end of the first cylindrical portion 61 and the rear end of the second cylindrical portion 62. The annular rib portion 64 protrudes forward from the outer edge of the front surface of the front wall portion 63. In a plane perpendicular to the output rotation axis AX, the annular rib portion 64 is substantially annular.

[0075] As shown in Figures 2, 5, 21, 22, etc., the main body housing 2, gear case 5, and hammer case 6 are fixed together by a plurality of screws 41. The main body housing 2 has a plurality of screw bosses 2B. The gear case 5 has a plurality of screw bosses 5B. The hammer case 6 has a plurality of screw bosses 6B. The screws 41 are inserted into openings provided in the screw bosses 2B of the main body housing 2 and openings provided in the screw bosses 5B of the gear case 5. The screws 41 are inserted into threaded holes provided in the screw bosses 6B of the hammer case 6. The screws 41 are inserted from the rear side of the screw bosses 2B into the openings of the screw bosses 2B and 5B, and then inserted into the threaded holes of the screw bosses 6B.

[0076] An opening is provided in the upper part of the motor case 4. An opening is provided in the lower part of the gear case 5. The internal spaces of the motor case 4 and the gear case 5 are connected via the opening in the upper part of the motor case 4 and the opening in the lower part of the gear case 5. As shown in Figures 21 and 22, the motor case 4 and the gear case 5 are fixed together with a plurality of screws 5S.

[0077] An opening is provided in the front of the gear case 5. An opening is provided in the rear of the hammer case 6. The internal spaces of the gear case 5 and the hammer case 6 are connected via the opening in the front of the gear case and the opening in the rear of the hammer case 6.

[0078] The side handle 7 is held by the operator. The side handle 7 has a handle portion 7A held by the operator and a base portion 7B fixed to the hammer case 6. The handle portion 7A is disposed on the left side of the hammer case 6. The base portion 7B is disposed so as to surround the first cylindrical portion 61 of the hammer case 6. The base portion 7B is substantially annular (arcuate). The left end portion of the base portion 7B is cut out.

[0079] The left end of the base portion 7B is connected to the handle portion 7A via a tightening mechanism 42. The tightening mechanism 42 has a screw 42A that is placed in a threaded hole provided in the left end of the base portion 7B, and a dial 42B that is rotatable relative to the screw 42A. The operator can rotate the screw 42A by operating the dial 42B. By rotating the dial 42B, the hammer case 6 is tightened to the base portion 7B, and the side handle 7 is fixed to the hammer case 6.

[0080] In the embodiment, the handle portion 7A is disposed to the left of the hammer case 6, but the handle portion 7A can be disposed in any position around the hammer case 6. For example, the handle portion 7A can be disposed to the left of the hammer case 6, above the hammer case 6, or below the hammer case 6. The position (angle) of the handle portion 7A relative to the hammer case 6 can be adjusted 360 degrees.

[0081] The rear bumper 8 is arranged to cover at least a portion of the surface of the hammer case 6. As shown in Figures 12 and 13, the rear bumper 8 is arranged to cover the outer peripheral surface of the first cylindrical portion 61, the outer peripheral surface of the annular rib portion 64, and the front end surface of the annular rib portion 64. The rear bumper 8 protects the hammer case 6. The rear bumper 8 prevents the hammer case 6 from coming into contact with objects around the impact tool 1. The rear bumper 8 is made of rubber.

[0082] The front bumper 120 is arranged to cover at least a portion of the surface of the hammer case 6. As shown in Figs. 12 and 13, the front bumper 120 is arranged to cover the outer peripheral surface of the second cylindrical portion 62. The front bumper 120 protects the hammer case 6. The front bumper 120 prevents contact between the hammer case 6 and objects around the impact tool 1. The front bumper 120 is made of rubber.

[0083] As shown in FIG. 13 , the front bumper 120 has a cylindrical portion 121 that covers the outer peripheral surface of the second cylindrical portion 62, and a recessed portion 122 that is recessed radially outward from the inner peripheral surface of the cylindrical portion 121. The cylindrical portion 121 is arranged to surround the second cylindrical portion 62. A protruding portion 62A provided on the outer peripheral surface of the second cylindrical portion 62 is arranged in the recessed portion 122. The front bumper 120 is fixed to the second cylindrical portion 62 by the elastic force (fastening force) of rubber. Furthermore, the front bumper 120 is positioned on the second cylindrical portion 62 by inserting the protruding portion 62A into the recessed portion 122.

[0084] The battery holder 9 holds the battery pack 43. The battery pack 43 is attached to and detached from the battery holder 9. The controller accommodating portion 24 is disposed above the battery pack 43 attached to the battery holder 9. The protrusion 22 is disposed in front of the battery pack 43 attached to the battery holder 9. The battery pack 43 functions as a power source for the impact tool 1. The battery pack 43 includes a secondary battery. In the embodiment, the battery pack 43 includes a rechargeable lithium-ion battery. When attached to the battery holder 9, the battery pack 43 can supply power to the impact tool 1. The motor 10 is driven based on the power supplied from the battery pack 43. The controller 11 operates based on the power supplied from the battery pack 43.

[0085] The battery holder 9 holds a plate-shaped terminal 44. The terminal 44 has a synthetic resin plate and a metal connection terminal disposed on the plate. When the battery pack 43 is attached to the battery holder 9, the battery terminal, which is the connection terminal of the battery pack 43, and the terminal of the terminal 44 are connected to each other.

[0086] The battery housing 3 holds a spring 45 and a cushion rubber 46. The spring 45 is disposed on the front side of the battery holder 9. The cushion rubber 46 is disposed on the front side of the battery pack 43 held in the battery holder 9. The spring 45 biases the battery holder 9 rearward. The cushion rubber 46 is disposed on the front side of the battery pack 43 attached to the battery holder 9. The cushion rubber 46 is disposed further forward than the battery pack 43 attached to the battery holder 9. The cushion rubber 46 is capable of coming into contact with the front part of the battery pack 43. For example, if the impact tool 1 is dropped, the elastic force of the spring 45 absorbs the impact acting on the terminal 44, and the cushion rubber 46 absorbs the impact acting on the battery pack 43.

[0087] The motor 10 functions as a power source for the impact tool 1. The motor 10 is an inner rotor type DC brushless motor. As shown in FIG. 11 , the motor 10 has a stator 47, a rotor 48, and a rotor shaft 49. The stator 47 is supported by the motor case 4. At least a portion of the rotor 48 is disposed inside the stator 47. The rotor shaft 49 is fixed to the rotor 48. The rotor 48 is rotatable relative to the stator 47 around a motor rotation axis MX extending in the vertical direction.

[0088] 11, the stator 47 includes a stator core 47A, an insulator 47B fixed to the stator core 47A, and a plurality of coils 47C wound around each of the teeth of the stator core 47A via the insulator 47B. The coils 47C are connected via a busbar unit 47D. The busbar unit 47D is fixed to the lower part of the insulator 47B with screws 47E.

[0089] 11, 24, 26, 27, 28, etc., in this embodiment, an inner member 80 is disposed between the outer peripheral surface of the stator core 47A and the inner peripheral surface of the cylindrical portion 4A of the motor case 4. The inner member 80 is substantially annular. The inner member 80 is made of glass fiber reinforced polycarbonate resin.

[0090] The rotor 48 rotates about the motor rotation axis MX. As shown in Fig. 11, the rotor 48 has a rotor core 48A and a rotor magnet 48B fixed to the rotor core 48A. In the embodiment, the rotor magnet 48B is disposed inside the rotor core 48A. Alternatively, the rotor magnet 48B may be disposed on the outer circumferential surface of the rotor core 48A.

[0091] As shown in FIG. 11 , the sensor board 50 is fixed to the busbar unit 47D of the stator 47. The sensor board 50 is housed in the motor case 4. The sensor board 50 is fixed to the busbar unit 47D with screws 50S. The sensor board 50 detects the position of the rotor 48 in the rotational direction. The sensor board 50 has an annular circuit board 50A and a magnetic sensor 50B supported by the circuit board 50A. The magnetic sensor 50B is a Hall IC. The magnetic sensor 50B detects the position of the rotor 48 in the rotational direction by detecting the position of the rotor magnet 48B of the rotor 48.

[0092] The rotor shaft 49 is fixed to a rotor core 48A of the rotor 48. The rotor 48 and the rotor shaft 49 rotate together about the motor rotation axis MX.

[0093] 11 , the rotor shaft 49 is rotatably supported by rotor bearings 51 and 52. The rotor bearing 51 rotatably supports an upper portion of the rotor shaft 49 that protrudes above the upper end surface of the rotor 48. The rotor bearing 52 rotatably supports a lower portion of the rotor shaft 49 that protrudes below the lower end surface of the rotor 48. The rotor bearing 51 is held by the gear case 5. The rotor bearing 52 is held by the motor case 4.

[0094] 11, a first bevel gear 53 is fixed to the upper end of the rotor shaft 49. The first bevel gear 53 is connected to at least a part of the reduction mechanism 13. The first bevel gear 53 rotates around the motor rotation axis MX. The rotor shaft 49 is connected to the reduction mechanism 13 via the first bevel gear 53.

[0095] The controller 11 outputs a control signal to control the motor 10. As shown in Fig. 9, the controller 11 includes a circuit board 11B on which a plurality of electronic components 11C are mounted. Examples of the electronic components 11C mounted on the circuit board 11B include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or storage, a volatile memory such as a RAM (Random Access Memory), a field effect transistor (FET), a capacitor, and a resistor.

[0096] 9, the controller 11 is housed in a controller housing portion 24. In the controller housing portion 24, the controller 11 is held in a controller case 11A.

[0097] 9, 11, 21, 22, and 23, a baffle plate 30 is disposed at the upper end of the motor case 4. The baffle plate 30 is annular. The baffle plate 30 is fixed to the motor case 4 with screws 30S.

[0098] The fan 12 generates an airflow for cooling the motor 10 and the controller 11. As shown in FIGS. 9 and 11, the fan 12 is disposed above the stator 47. The fan 12 is fixed to the upper part of the rotor shaft 49. The fan 12 is disposed between the rotor bearing 51 and the baffle plate 30. The fan 12 and the baffle plate 30 face each other. The fan 12 and the rotor shaft 49 rotate together.

[0099] As shown in FIGS. 3 and 4 , an air intake port 26 is provided in the controller housing 24. An exhaust port 27 is provided in the main body 21. As shown in FIG. 11 , an opening 4C is provided at the rear of the motor case 4. As the fan 12 rotates, air from the external space of the main body housing 2 flows into the internal space of the controller housing 24 through the air intake port 26. The air that flows into the internal space of the controller housing 24 cools the controller 11 by circulating through the internal space of the controller housing 24. As the fan 12 rotates, the air that flows through the internal space of the controller housing 24 flows into the internal space of the motor case 4 through the opening 4C. The air that flows into the internal space of the motor case 4 cools the motor 10 by circulating through the internal space of the motor case 4. As the fan 12 rotates, at least a portion of the air that flows through the internal space of the motor case 4 flows out through the exhaust port 27 to the external space of the motor case 4.

[0100] The reduction mechanism 13 is rotated by the motor 10. The reduction mechanism 13 transmits the rotational force of the motor 10 to the impact mechanism 15 via the spindle 14. The reduction mechanism 13 connects the rotor shaft 49 and the spindle 14. The reduction mechanism 13 rotates the spindle 14 at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0101] 11, the reduction mechanism 13 has a first bevel gear 53, a second bevel gear 54 that meshes with the first bevel gear 53, and a planetary gear mechanism 55 that is driven based on the rotational force of the motor 10 transmitted via the second bevel gear 54. The first bevel gear 53 rotates about the motor rotation axis MX. The second bevel gear 54 rotates about the output rotation axis AX.

[0102] The planetary gear mechanism 55 is housed in the gear case 5. As shown in FIG. 11 , the planetary gear mechanism 55 has a sun gear 55S, a planetary gear 55P, and an internal gear 55I. A plurality of planetary gears 55P are provided. The plurality of planetary gears 55P are arranged around the sun gear 55S. The internal gear 55I is arranged around the plurality of planetary gears 55P. The internal gear 55I is fixed to the inner circumferential surface of the gear case 5.

[0103] The second bevel gear 54 is disposed around the sun gear 55S. The second bevel gear 54 is fixed to the sun gear 55S. The second bevel gear 54 and the sun gear 55S rotate together. The second bevel gear 54 and the sun gear 55S are rotatable about an output rotation axis AX extending in the front-to-rear direction. The output rotation axis AX and the motor rotation axis MX are perpendicular to each other. The rear end of the sun gear 55S is supported by a gear bearing 56. The middle portion of the sun gear 55S is supported by a gear bearing 57. The gear bearing 56 is held by the bearing cover 40. The gear bearing 57 is held by the gear case 5. The rotor shaft 49 rotates, causing the first bevel gear 53 to rotate, thereby rotating the second bevel gear 54. The rotation of the second bevel gear 54 causes the sun gear 55S to rotate.

[0104] Each of the multiple planetary gears 55P meshes with the sun gear 55S. The planetary gear 55P is rotatably supported on the rear part of the spindle 14 via a pin 55A. The spindle 14 is rotated by the planetary gear 55P. The internal gear 55I has internal teeth that mesh with the planetary gear 55P. The internal gear 55I is fixed to the gear case 5. Multiple protrusions are provided on the outer peripheral surface of the internal gear 55I. The protrusions of the internal gear 55I fit into recesses provided on the inner peripheral surface of the gear case 5. The internal gear 55I is always non-rotatable relative to the gear case 5.

[0105] When the rotor shaft 49 and the first bevel gear 53 are rotated by the drive of the motor 10, the second bevel gear 54 and the sun gear 55S are rotated. When the sun gear 55S rotates, the planetary gear 55P revolves around the sun gear 55S. The planetary gear 55P revolves while meshing with the internal teeth of the internal gear 55I. Due to the revolution of the planetary gear 55P, the spindle 14 connected to the planetary gear 55P via the pin 55A rotates at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0106] The spindle 14 rotates due to the rotational force of the motor 10 transmitted via the reduction mechanism 13. The spindle 14 transmits the rotational force of the motor 10 transmitted via the reduction mechanism 13 to the impact mechanism 15. The spindle 14 is rotatable around the output rotation axis AX. A rear portion of the spindle 14 is housed in the gear case 5. A front portion of the spindle 14 is housed in the hammer case 6. At least a portion of the spindle 14 is disposed on the front side of the reduction mechanism 13. The spindle 14 is disposed on the rear side of the anvil 16.

[0107] 12, the spindle 14 has a flange portion 14A, a spindle shaft portion 14B, and a protrusion portion 14C. The spindle shaft portion 14B protrudes forward from the flange portion 14A. The protrusion portion 14C protrudes rearward from the flange portion 14A.

[0108] 11 , the planetary gear 55P is rotatably supported on the protrusion 14C via a pin 55A. The spindle 14 is rotatably supported on a spindle bearing 58. The spindle bearing 58 rotatably supports the protrusion 14C. The spindle bearing 58 is held in the gear case 5.

[0109] The striking mechanism 15 strikes the anvil 16 in the rotational direction around the output rotation axis AX. The striking mechanism 15 is disposed in front of the motor 10. The striking mechanism 15 is driven by the motor 10. The striking mechanism 15 is rotatable around the output rotation axis AX. The rotational force of the motor 10 is transmitted to the striking mechanism 15 via the reduction mechanism 13 and the spindle 14. The striking mechanism 15 strikes the anvil 16 in the rotational direction based on the rotational force of the spindle 14, which is rotated by the motor 10.

[0110] The striking mechanism 15 is housed in the first cylindrical portion 61 of the hammer case 6. As shown in FIG. 12 , the striking mechanism 15 has a hammer 71, a ball 72, a first coil spring 73, a second coil spring 74, a third coil spring 75, a first washer 76, and a second washer 77.

[0111] The hammer 71 is disposed on the front side of the reduction mechanism 13. The hammer 71 is disposed around the spindle shaft portion 14B. The hammer 71 is held by the spindle shaft portion 14B. The hammer 71 is rotated by the motor 10. The hammer 71 is rotated by the rotation of the motor 10 transmitted via the reduction mechanism 13. The ball 72 is disposed between the spindle shaft portion 14B and the hammer 71. The hammer 71 has a cylindrical hammer body 71A and a hammer protrusion portion 71B provided at the front of the hammer body 71A. An annular recess 71C is provided on the rear surface of the hammer body 71A. The recess 71C is recessed forward from the rear surface of the hammer body 71A.

[0112] The hammer 71 is rotated by the motor 10. The rotational force of the motor 10 is transmitted to the hammer 71 via the reduction mechanism 13 and the spindle 14. The hammer 71 can rotate together with the spindle 14 based on the rotational force of the spindle 14 rotated by the motor 10. The hammer 71 and the spindle 14 each rotate around the output rotation axis AX.

[0113] The first washer 76 is disposed inside the recess 71C. The first washer 76 is supported by the hammer 71 via a plurality of balls 78. The balls 78 are disposed on the front side of the first washer 76.

[0114] The second washer 77 is disposed inside the recess 71C and rearward of the first washer 76. The outer diameter of the second washer 77 is smaller than the outer diameter of the first washer 76. The second washer 77 and the hammer 71 are relatively movable in the front-rear direction.

[0115] The first coil spring 73 is disposed around the spindle shaft portion 14B. The rear end of the first coil spring 73 is supported by the flange portion 14A. The front end of the first coil spring 73 is disposed inside the recess 71C and is supported by the first washer 76. The first coil spring 73 constantly generates an elastic force that moves the hammer 71 forward.

[0116] The second coil spring 74 is disposed around the spindle shaft portion 14B. The second coil spring 74 is disposed radially inward of the first coil spring 73. The rear end of the second coil spring 74 is supported by the flange portion 14A. The front end of the second coil spring 74 is disposed inside the recess 71C and is supported by the second washer 77. The second coil spring 74 generates an elastic force that moves the hammer 71 forward when the hammer 71 moves rearward.

[0117] The third coil spring 75 is disposed around the spindle shaft portion 14B. The third coil spring 75 is disposed radially inward of the first coil spring 73. The third coil spring 75 is disposed inside the recess 71C. The rear end of the third coil spring 75 is supported by the second washer 77. The front end of the third coil spring 75 is supported by the first washer 76. The third coil spring 75 generates an elastic force that moves the second coil spring 74 rearward. The elastic force of the third coil spring 75 presses the rear end of the second coil spring 74 against the flange portion 14A. This prevents the second coil spring 74 from moving loosely relative to the flange portion 14A.

[0118] The ball 72 is made of a metal such as steel. The ball 72 is disposed between the spindle shaft portion 14B and the hammer 71. The spindle 14 has a spindle groove 14D in which at least a portion of the ball 72 is disposed. The spindle groove 14D is provided on a portion of the outer surface of the spindle shaft portion 14B. The hammer 71 has a hammer groove 71D in which at least a portion of the ball 72 is disposed. The hammer groove 71D is provided on a portion of the inner surface of the hammer 71. The ball 72 is disposed between the spindle groove 14D and the hammer groove 71D. The ball 72 can roll inside the spindle groove 14D and inside the hammer groove 71D. The hammer 71 can move along with the ball 72. The spindle 14 and the hammer 71 can move relative to each other in a direction parallel to the output rotation axis AX and in a rotational direction about the output rotation axis AX within a movable range defined by the spindle groove 14D and the hammer groove 71D.

[0119] The anvil 16 is an output part of the impact tool 1 that rotates based on the rotational force of the motor 10. At least a portion of the anvil 16 is disposed in front of the hammer 71. The anvil 16 is struck in the rotational direction by the hammer 71 of the striking mechanism 15.

[0120] As shown in Figure 12, the anvil 16 has an anvil recess 16A. The anvil recess 16A is provided at the rear end of the anvil 16. The anvil recess 16A is recessed forward from the rear end of the anvil 16. The spindle 14 is disposed behind the anvil 16. The front end of the spindle shaft portion 14B is disposed in the anvil recess 16A.

[0121] The anvil 16 has an anvil shaft portion 16B and an anvil protrusion portion 16C. The anvil shaft portion 16B is disposed on the front side of the striking mechanism 15. The anvil protrusion portion 16C protrudes radially outward from the rear end portion of the anvil shaft portion 16B. The anvil protrusion portion 16C is struck by the striking mechanism 15 in the rotational direction around the output rotation axis AX.

[0122] The front end of the anvil shaft portion 16B is disposed on the front side of the hammer case 6 through the front opening of the second cylindrical portion 62. A socket is attached as a tip tool to the front end of the anvil shaft portion 16B.

[0123] The anvil 16 is rotatably supported by an anvil bearing 79. The anvil bearing 79 is arranged around the anvil shaft portion 16B. The anvil 16 is rotatable around the output rotation axis AX. The anvil bearing 79 is held by the hammer case 6. The anvil bearing 79 is arranged inside the second cylindrical portion 62 of the hammer case 6. The anvil bearing 79 is held by the second cylindrical portion 62 of the hammer case 6.

[0124] In the embodiment, the anvil bearing 79 is a sliding bearing. The anvil bearing 79 is cylindrical. In the embodiment, a sleeve is used as the anvil bearing 79. Note that the sliding bearing may be formed by impregnating a cylindrical porous metal body manufactured by powder metallurgy, for example, with lubricating oil.

[0125] In a cross section perpendicular to the output rotation axis AX, the outer peripheral surface of a portion of the anvil shaft portion 16B supported by the anvil bearing 79 has a circular shape. In a cross section perpendicular to the output rotation axis AX, the inner peripheral surface of the anvil bearing 79 has a circular shape.

[0126] The front end of the anvil shaft portion 16B is positioned forward of the second cylindrical portion 62 through the opening at the front end of the second cylindrical portion 62. At least a portion of the anvil shaft portion 16B is positioned inside the opening at the front end of the second cylindrical portion 62. As shown in Figures 12 and 13, a seal member 94 is provided at the front end of the anvil bearing 79. The seal member 94 is positioned inside the front end of the anvil bearing 79. A recess 79A is provided at the front end of the inner circumferential surface of the anvil bearing 79. The seal member 94 is positioned inside the recess 79A. The seal member 94 seals the boundary between the front end of the anvil bearing 79 and the anvil shaft portion 16B.

[0127] The trigger switch 17 is operated by an operator to drive the motor 10. Driving the motor 10 means that the coil of the stator 47 is energized to rotate the rotor 48. The trigger switch 17 is provided on the upper part of the rear grip portion 23A. As shown in FIG. 9, the trigger switch 17 includes a trigger lever 17A and a switch body 17B. The switch body 17B is disposed in the internal space of the rear grip portion 23A. The trigger lever 17A protrudes forward from the upper front part of the rear grip portion 23A. The trigger lever 17A is operated by an operator to move it rearward. When the trigger lever 17A is operated to move rearward, the motor 10 is driven. When the operation of the trigger lever 17A is released, the driving of the motor 10 is stopped.

[0128] The forward / reverse switching lever 29 is operated by an operator to switch the rotation direction of the motor 10. The forward / reverse switching lever 29 is arranged on the upper grip portion 23B. The forward / reverse switching lever 29 is supported on the upper grip portion 23B so as to be slidable in the front-rear direction. When the forward / reverse switching lever 29 is slid forward, the motor 10 rotates in the forward direction. When the forward / reverse switching lever 29 is slid backward, the motor 10 rotates in the reverse direction.

[0129] The light assembly 18 emits illumination light. The light assembly 18 illuminates the anvil 16 and the area around the anvil 16 with the illumination light. The light assembly 18 illuminates the area in front of the anvil 16 with the illumination light. The light assembly 18 also illuminates the socket attached to the anvil 16 and the area around the socket with the illumination light. The light assembly 18 is arranged around the second cylindrical portion 62 of the hammer case 6.

[0130] The interface panel 19 includes, for example, operation buttons for selecting a light emission mode of the light assembly 18. The interface panel 19 includes, for example, a display unit for displaying the remaining capacity of the battery pack 43.

[0131] The hook assembly 20 is hooked onto an object. The hook assembly 20 has a base portion 20A and a ring portion 20B. The base portion 20A is fixed to the upper part of the main housing 2. In this embodiment, the base portion 20A has an opening into which a screw 41 is inserted. The screw 41 is inserted through the opening in the base portion 20A and into the opening in the screw boss 2B. The base portion 20A is fixed to the upper part of the main housing 2 by being sandwiched between the head of the screw 41 and the screw boss 2B. The ring portion 20B is arranged to protrude upward from the base portion 20A. When at least a portion of the object is inserted into the base portion 20A, the impact tool 1 is suspended from the object via the hook assembly 20.

[0132] [Light Assembly] 14 is an exploded perspective view from the front right side showing the light assembly 18 according to the embodiment. As shown in FIGS. 13 and 14, the light assembly 18 has a light emitter unit 90, an axial elastic body 91, and a radial elastic body 92.

[0133] The light emitting unit 90 is disposed around the second cylindrical portion 62. The light emitting unit 90 includes chip-on-board light emitting diodes 95 (COB LEDs) and an optical member 96. The chip-on-board light emitting diode 95 has a substrate 95A, an LED chip 95B as a light emitting element, and a phosphor 95C.

[0134] At least a portion of the optical member 96 is disposed forward of the chip-on-board light-emitting diode 95. At least a portion of the optical member 96 is disposed so as to face the front surface of the chip-on-board light-emitting diode 95. Light emitted from the LED chip 95B of the chip-on-board light-emitting diode 95 passes through the optical member 96 and is irradiated onto the front side of the light-emitting body unit 90.

[0135] The optical member 96 is made of polycarbonate resin. In this embodiment, the optical member 96 is made of polycarbonate resin containing a white diffusing material. The optical member 96 is milky white. The light transmittance of the optical member 96 is 40% or more and 70% or less. Because the optical member 96 is milky white, the outer shape of the LED chip 95B is difficult to see from the outside of the impact tool 1. Because the outer shape of the LED chip 95B is difficult to see, the design of the impact tool 1 is improved.

[0136] The axial elastic body 91 and the radial elastic body 92 are each made of rubber. The axial elastic body 91 and the radial elastic body 92 each suppress the transmission of vibrations of the hammer case 6 to the light emitting unit 90. The axial elastic body 91 and the radial elastic body 92 each function as a vibration-damping member that attenuates vibrations input to the light emitting unit 90.

[0137] The radial elastic body 92 is annular. The radial elastic body 92 is disposed so as to surround the anvil shaft portion 16B. The radial elastic body 92 is disposed so as to surround the second cylindrical portion 62.

[0138] The radial elastic body 92 is supported by the hammer case 6. The radial elastic body 92 supports the light emitter unit 90 from the radial inside. At least a portion of the radial elastic body 92 faces the front surface of the optical member 96. The radial elastic body 92 has a radial base portion 92A, a rear support portion 92B, and a front support portion 92C. The radial base portion 92A, the rear support portion 92B, and the front support portion 92C are integral with each other.

[0139] The radial base portion 92A is disposed radially between the second cylindrical portion 62 and the light-emitting unit 90. The radial base portion 92A is cylindrical. The radial base portion 92A is disposed around the second cylindrical portion 62. The inner peripheral surface of the radial base portion 92A faces the outer peripheral surface of the second cylindrical portion 62. The inner peripheral surface of the radial base portion 92A contacts the outer peripheral surface of the second cylindrical portion 62. The outer peripheral surface of the radial base portion 92A faces the inner peripheral surface of the light-emitting unit 90. The outer peripheral surface of the radial base portion 92A contacts the inner peripheral surface of the light-emitting unit 90.

[0140] The rear support portion 92B supports the light emitter unit 90 from the rear side. The rear support portion 92B is annular. The rear support portion 92B is connected to the rear end portion of the radial base portion 92A. The rear support portion 92B protrudes radially outward from the rear end portion of the radial base portion 92A. The rear surface of the rear support portion 92B faces the front surface of the front wall portion 63. The front surface of the rear support portion 92B contacts the rear surface of the light emitter unit 90.

[0141] The front support portion 92C supports the light emitter unit 90 from the front side. The front support portion 92C is annular. The front support portion 92C is connected to the front end portion of the radial base portion 92A. The front support portion 92C protrudes radially outward from the front end portion of the radial base portion 92A. The rear surface of the front support portion 92C contacts the front surface of the light emitter unit 90. The front surface of the front support portion 92C contacts the rear surface of the front bumper 120.

[0142] The axial elastic body 91 is annular and is disposed so as to surround the light emitting unit 90.

[0143] The axial elastic body 91 is supported by the light emitting body unit 90. The axial elastic body 91 supports the light emitting body unit 90 from the rear side. In the radial direction, at least a portion of the axial elastic body 91 is disposed between the annular rib portion 64 and the light emitting body unit 90. The axial elastic body 91 has an axial base portion 91A, a rear support portion 91B, and a front support portion 91C. The axial base portion 91A, the rear support portion 91B, and the front support portion 91C are integral with each other.

[0144] The axial base portion 91A is disposed radially between the annular rib portion 64 and the light emitter unit 90. The axial base portion 91A is cylindrical. The axial base portion 91A is disposed around the light emitter unit 90. The outer peripheral surface of the axial base portion 91A faces the inner peripheral surface of the annular rib portion 64. The outer peripheral surface of the axial base portion 91A contacts the inner peripheral surface of the annular rib portion 64. The inner peripheral surface of the axial base portion 91A faces the outer peripheral surface of the light emitter unit 90. The inner peripheral surface of the axial base portion 91A contacts the outer peripheral surface of the light emitter unit 90.

[0145] The rear support portion 91B supports the light emitter unit 90 from the rear side. The rear support portion 91B is annular. The rear support portion 91B is connected to the rear end portion of the axial base portion 91A. The rear support portion 91B protrudes radially inward from the rear end portion of the axial base portion 91A. The rear surface of the rear support portion 91B faces the front surface of the front wall portion 63. The front surface of the rear support portion 91B contacts the rear surface of the light emitter unit 90.

[0146] The front support portion 91C supports the light emitter unit 90 from the front side. The front support portion 91C is annular. The front support portion 91C is connected to the front end portion of the axial base portion 91A. The front support portion 91C protrudes radially inward from the front end portion of the axial base portion 91A. The rear surface of the front support portion 91C contacts the front surface of the light emitter unit 90.

[0147] The front bumper 120 is disposed so as to cover at least a portion of the surface of the hammer case 6 forward of the light assembly 18. The front bumper 120 contacts at least a portion of the front surface of the light assembly 18. The front bumper 120 supports the light assembly 18 from the front side. The front bumper 120 supports the radial elastic body 92 from the front side. The front bumper 120 contacts at least a portion of the front surface of the radial elastic body 92.

[0148] The front bumper 120 supports the front support portion 92C from the front side. The rear surface of the front bumper 120 contacts the front surface of the front support portion 92C.

[0149] The front bumper 120 supports the light emitter unit 90 from the front side via the radial elastic body 92. The front bumper 120 supports the optical member 96 from the front side via the radial elastic body 92. In the radial direction, the outer end of the front bumper 120 is disposed outward from the inner end of the optical member 96. The outer end of the front bumper 120 and the inner end of the optical member 96 overlap in the radial direction.

[0150] In the embodiment, the rubber hardness of the rear bumper 8 is the same as that of the front bumper 120. The rubber hardness of the radial elastic body 92 is the same as that of the axial elastic body 91. The rubber hardness of the front bumper 120 and the rear bumper 8 is higher than that of the radial elastic body 92 and the axial elastic body 91.

[0151] The washer 93 supports the front support portion 92C from the front side. The front surface of the front support portion 92C and the rear surface of the washer 93 are in contact with each other. As shown in Fig. 13, the washer 93 is disposed in a washer groove 62B provided on the outer peripheral surface of the second tubular portion 62. The washer 93 functions as a fastener that supports the front support portion 92C from the front side.

[0152] [Shock absorption mechanism] Fig. 15 is a cross-sectional view showing a part of the impact tool 1 according to the embodiment, and corresponds to an enlarged view of a part of Fig. 9. Fig. 16 is a cross-sectional view showing a part of the impact tool 1 according to the embodiment, and corresponds to a cross-sectional view taken along line CC in Fig. 3. Fig. 17 is an exploded perspective view showing the battery housing 3 and the battery holder 9 according to the embodiment, as seen from the right front side.

[0153] The impact tool 1 comprises a main body housing 2 that houses a motor 10, vibration-damping rubber 100 supported by the main body housing 2, a battery housing 3 supported by the vibration-damping rubber 100, a battery holder 9 to which a battery pack 43 is attached, and a spring 45 and cushion rubber 46 supported by the battery housing 3.

[0154] The battery housing 3 has a holder support portion 31 that supports the battery holder 9, and an elastic member support portion 32 that is disposed in front of the battery pack 43 attached to the battery holder 9.

[0155] The battery housing 3 includes a left battery housing 3L and a right battery housing 3R. The holder support portion 31 is separated into the left battery housing 3L and the right battery housing 3R. The battery holder 9 is sandwiched between the holder support portion 31 of the left battery housing 3L and the holder support portion 31 of the right battery housing 3R.

[0156] The battery holder 9 holds the terminal 44. The terminal 44 has a terminal plate 44A and a terminal terminal 44B fixed to the terminal plate 44A. The terminal terminal 44B protrudes downward from the lower surface of the terminal plate 44A. A battery terminal of the battery pack 43 is connected to the terminal terminal 44B of the terminal 44. The battery holder 9 holds the terminal plate 44A. An opening 37 is provided in the upper part of the holder support part 31. At least a portion of the terminal 44 is disposed inside the opening 37. When the terminal 44 and the controller 11 are connected via a lead wire, the lead wire can pass through the opening 37.

[0157] The battery holder 9 is movably supported by the battery housing 3. In the embodiment, the battery holder 9 is movably supported by the battery housing 3 in the front-rear direction. The battery holder 9 is movable relative to the battery housing 3 in the front-rear direction.

[0158] The battery holder 9 has a terminal holding portion 901 , a protrusion 902 , and a slide portion 903 .

[0159] The terminal holding portion 901 holds the terminal plate 44A. In this embodiment, the battery holder 9 includes a left battery holder 9L and a right battery holder 9R. The right battery holder 9R is disposed to the right of the left battery holder 9L. The left battery holder 9L and the right battery holder 9R form a pair of half-split holders. The terminal 44 is sandwiched between the left battery holder 9L and the right battery holder 9R.

[0160] The protrusion 902 protrudes forward from the front end of the terminal holding portion 901. The spring 45 is a coil spring. The protrusion 902 is inserted inside the spring 45.

[0161] The battery housing 3 has a guide portion 35 that guides a slide portion 903 provided on the battery holder 9. The slide portion 903 is guided in the front-rear direction by the guide portion 35 of the battery housing 3. In the embodiment, the guide portion 35 includes a guide groove provided on the inner surface of the battery housing 3. The slide portion 903 is movable in the front-rear direction inside the guide groove.

[0162] The slide portions 903 are provided on the left and right sides of the terminal holding portion 901. The guide portions 35 are provided on the left and right sides of the terminal holding portion 901 in the holder support portion 31. The battery housing 3 includes a left battery housing 3L and a right battery housing 3R. The guide portions 35 are provided on each of the left battery housing 3L and the right battery housing 3R.

[0163] The spring 45 and the cushion rubber 46 are each supported by an elastic member support portion 32 of the battery housing 3. The elastic member support portion 32 has a spring holding portion 33 that holds the spring 45 and a rubber holding portion 34 that holds the cushion rubber 46.

[0164] The spring holding portion 33 includes a recess provided in the elastic member support portion 32. The recess is recessed forward from the rear surface of the elastic member support portion 32. The front portion of the spring 45 is positioned inside the recess, so that the spring 45 is held by the spring holding portion 33. The protrusion 902 of the battery holder 9 is inserted into the inside of the spring 45 from its rear end portion. The rear end portion of the spring 45 is supported by the front surface of the terminal holding portion 901.

[0165] The cushion rubber 46 has a main body 46A and a protrusion 46B that protrudes forward from the front surface of the main body 46A. Two protrusions 46B are provided spaced apart in the vertical direction. The rubber retaining portion 34 includes an opening provided in the elastic member support portion 32. The protrusions 46B are disposed in the openings, thereby holding the cushion rubber 46 in the rubber retaining portion 34. A portion of the rubber retaining portion 34 (opening) is provided in the left battery housing 3L, and a portion of the rubber retaining portion 34 (opening) is provided in the right battery housing 3R. With the protrusions 46B disposed between the rubber retaining portion 34 (opening) in the left battery housing 3L and the rubber retaining portion 34 (opening) in the right battery housing 3R, the left battery housing 3L and the right battery housing 3R are fastened together with the screws 3S, thereby holding the protrusions 46B in the rubber retaining portion 34.

[0166] The spring 45 and the cushion rubber 46 each suppress relative movement between the battery housing 3 and the battery pack 43 attached to the battery holder 9. The spring 45 is a compression spring. The spring 45 biases the battery holder 9 in a direction away from the cushion rubber 46.

[0167] The battery pack 43 is attached to the battery holder 9 by sliding it from the rear side of the battery holder 9 to the front side relative to the battery holder 9. The cushion rubber 46 is disposed on the front side of the battery pack 43. The spring 45 biases the battery holder 9 rearward. At least a portion of the battery holder 9 biased rearward comes into contact with the rear of the holder support portion 31 of the battery housing 3, thereby positioning the battery holder 9 in the front-to-rear direction.

[0168] When no external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the battery holder 9 is positioned in its initial position by the biasing force of the spring 45. The initial position of the battery holder 9 is a position determined by at least a portion of the battery holder 9, which is biased rearward, contacting the rear portion of the holder support portion 31 of the battery housing 3. When the battery holder 9 is positioned in its initial position, the cushion rubber 46 and the battery pack 43 attached to the battery holder 9 are spaced apart. When an external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the cushion rubber 46 and the battery pack 43 attached to the battery holder 9 come into contact with each other. In other words, when no external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the spring 45 suppresses relative movement between the battery housing 3 and the battery pack 43. When an external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the cushion rubber 46 suppresses relative movement between the battery housing 3 and the battery pack 43.

[0169] The vibration-damping rubber 100 prevents vibrations from the main body housing 2 from being transmitted to the battery housing 3. The vibration-damping rubber 100 attenuates vibrations input from the main body housing 2 to the battery housing 3. The vibration-damping rubber 100 is arranged between the main body housing 2 and the battery housing 3. The vibration-damping rubber 100 prevents contact between the main body housing 2 and the battery housing 3. The battery housing 3 is arranged between the main body housing 2 and the battery holder 9. The battery holder 9 is supported by the main body housing 2 via the vibration-damping rubber 100 and the battery housing 3.

[0170] The vibration-damping rubbers 100 are arranged on both the left and right sides of the battery housing 3. The vibration-damping rubbers 100 include a left vibration-damping rubber 100L arranged between the left main body housing 2L and the left battery housing 3L, and a right vibration-damping rubber 100R arranged between the right main body housing 2R and the right battery housing 3R.

[0171] The vibration-damping rubber 100 is rod-shaped and extends in three different directions. The vibration-damping rubber 100 has a first portion 101, a second portion 102, a third portion 103, and a fourth portion 104. The first portion 101 extends in the front-to-rear direction. In the left vibration-damping rubber 100L, the second portion 102 extends from the front end of the first portion 101 in a direction sloping downward toward the right. In the left vibration-damping rubber 100L, the third portion 103 extends downward from the bottom end of the second portion 102. In the left vibration-damping rubber 100L, the fourth portion 104 extends from the bottom end of the third portion 103 to the right. In the right vibration-damping rubber 100R, the second portion 102 extends from the front end of the first portion 101 in a direction sloping downward toward the left. In the right vibration-damping rubber 100R, the third portion 103 extends downward from the lower end of the second portion 102. In the right vibration-damping rubber 100R, the fourth portion 104 extends leftward from the lower end of the third portion 103.

[0172] The vibration-damping rubber 100 has a plurality of protrusions 106 that face the battery housing 3 and a holding groove 107 that faces the main housing 2. The protrusions 106 are provided on each of the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104. The holding groove 107 is formed across the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104.

[0173] The battery housing 3 has a holding recess 36 in which the vibration-damping rubber 100 is disposed. The holding recess 36 is formed to match the shape of the vibration-damping rubber 100 so that the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104 can be disposed therein.

[0174] A retaining recess 36 is provided on the left surface of the left battery housing 3L and the right surface of the right battery housing 3R. The left vibration-damping rubber 100L is placed in the retaining recess 36 provided in the left battery housing 3L. The right vibration-damping rubber 100R is placed in the retaining recess 36 provided in the right battery housing 3R. The protrusion 106 contacts the inner surface of the retaining recess 36. The protrusion 106 reduces the contact area between the vibration-damping rubber 100 and the battery housing 3.

[0175] The main housing 2 has a retaining protrusion 28 that is inserted into the retaining groove 107 of the vibration-damping rubber 100. The retaining protrusion 28 is formed to match the shape of the vibration-damping rubber 100 so that it can be inserted into the retaining groove 107 of the first part 101, the second part 102, the third part 103, and the fourth part 104.

[0176] The retaining protrusions 28 are provided on the inner surface of the left main body housing 2L and the inner surface of the right main body housing 2R. On the left main body housing 2L, the retaining protrusions 28 are provided so as to protrude to the right from the inner surface (right face) of the left main body housing 2L. On the right main body housing 2R, the retaining protrusions 28 are provided so as to protrude to the left from the inner surface (left face) of the right main body housing 2R. The retaining protrusions 28 of the left main body housing 2L are inserted into the retaining grooves 107 of the left vibration-proof rubber 100L. The retaining protrusions 28 of the right main body housing 2R are inserted into the retaining grooves 107 of the right vibration-proof rubber 100R.

[0177] In the embodiment, the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104, which extend in different directions from one another, are integral with one another. However, the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104 may be separate bodies.

[0178] [Holder mechanism] Fig. 18 is a view of a portion of the impact tool 1 according to the embodiment as seen from the right side, and corresponds to a view of the impact tool 1 with the right main body housing 2R removed. Fig. 19 is a perspective view of a portion of the impact tool 1 according to the embodiment as seen from the right front side, and corresponds to an enlarged view of a portion of Fig. 18. Fig. 20 is a perspective view of a portion of the impact tool 1 according to the embodiment as seen from the right lower rear side, and corresponds to an enlarged view of a portion of Fig. 18.

[0179] The motor case 4 has a holder mechanism 4H that holds the lead wire 39. Fig. 19 shows an example of the lead wire 39. In Fig. 19, there is one lead wire 39, but there may be multiple lead wires.

[0180] The holder mechanism 4H holds the lead wire 39 that passes outside the motor case 4. The holder mechanism 4H holds the lead wire 39 that passes on the right side of the motor case 4. The holder mechanism 4H holds the lead wire 39 that extends in the front-to-rear direction. The rear end of the lead wire 39 is located rearward of the motor case 4. The front end of the lead wire 39 is located forward of the motor case 4.

[0181] The holder mechanism 4H holds lead wires 39 connected to the controller 11. The controller 11 is arranged rearward of the motor case 4. The holder mechanism 4H holds lead wires 39 connected to an electronic device or electronic component arranged outside the motor case 4. The holder mechanism 4H holds lead wires 39 that are not connected to the motor 10. The holder mechanism 4H holds lead wires 39 connected to an electronic device or electronic component arranged forward of the motor case 4. In the embodiment, the electronic device arranged forward of the motor case 4 includes a light-emitting unit 90. The electronic component arranged forward of the motor case 4 includes an LED chip 95B.

[0182] In the embodiment, the connector 38 is disposed forward of the motor case 4. The connector 38 is electrically connected to the chip-on-board light-emitting diode 95 of the light emitter unit 90. The connector 38 is energized to the chip-on-board light-emitting diode 95 of the light emitter unit 90. The connector 38 is connected to the chip-on-board light-emitting diode 95 of the light emitter unit 90 by a lead wire (not shown). The connector 38 is connected to the substrate 95A of the chip-on-board light-emitting diode 95 by a lead wire (not shown). The connector 38 is housed in the main body portion 21 of the main housing 2. The connector 38 is disposed below the first cylindrical portion 61 of the hammer case 6. The connector 38 is disposed forward of the motor case 4. In the left-right direction, the center of the connector 38 and the center of the motor case 4 coincide with each other. The connector 38 is fixed to the lower surface of the first cylindrical portion 61. The connector 38 may be fixed to the main body portion 21.

[0183] The rear end of the lead wire 39 is connected to the controller 11. The front end of the lead wire 39 is connected to the connector 38. The lead wire 39 connects the controller 11 and the connector 38. The lead wire 39 is connected to the board 95A of the light-emitting unit 90 via the connector 38. The controller 11 is connected to the board 95A of the light-emitting unit 90 via the lead wire 39 and the connector 38. The holder mechanism 4H holds the middle portions of the lead wire 39 connected to the controller 11 and the connector 38, respectively.

[0184] The lead wire 39 supplies power to the light-emitting unit 90. Power from the battery pack 43 is supplied to the light-emitting unit 90 via the controller 11, the lead wire 39, and the connector 38. The LED chip 95B of the light-emitting unit 90 emits light based on the power supplied via the controller 11, the lead wire 39, and the connector 38.

[0185] The holder mechanism 4H has a base rib 4G that protrudes from the right side of the motor case 4 and a hook rib 4F that protrudes from the right side of the motor case 4. The base rib 4G and the hook rib 4F are each provided on the outer surface of the motor case 4.

[0186] The base rib 4G protrudes rightward from the right side surface of the cylindrical portion 4A. There is only one base rib 4G. No base rib 4G is provided on the left side surface of the cylindrical portion 4A. The base rib 4G supports the lead wire 39 from below.

[0187] The hook rib 4F is disposed above the base rib 4G. The hook rib 4F is spaced apart from the base rib 4G. In the embodiment, the motor case 4 has a protrusion 4D that protrudes laterally from an upper portion of the outer peripheral surface of the tubular portion 4A. The outer shape of the protrusion 4D is substantially rectangular parallelepiped. As shown in Figures 26, 27, and 28, the protrusion 4D is provided on the upper portion of each of the left and right sides of the tubular portion 4A. The hook rib 4F is disposed on the protrusion 4D on the right side of the tubular portion 4A. There are two hook ribs 4F. No hook rib 4F is provided on the protrusion 4D on the left side of the tubular portion 4A. In the up-down direction, the lead wire 39 is disposed between the base rib 4G and the hook rib 4F. The hook rib 4F supports the lead wire 39 from the right side to prevent the lead wire 39 supported by the base rib 4G from falling off the base rib 4G.

[0188] The hook rib 4F protrudes downward from the right end of the lower surface of the protruding portion 4D. The two hook ribs 4F are arranged with a gap in the front-to-rear direction. In the up-down direction, the position (height) of the front hook rib 4F and the position (height) of the rear hook rib 4F are substantially the same. The base rib 4G protrudes rightward from the right side surface of the tubular portion 4A, below the protruding portion 4D. In the front-to-rear direction, the base rib 4G is arranged between the front hook rib 4F and the rear hook rib 4F.

[0189] As shown in FIG. 19, the left main body housing 2L has a holder 2H that holds the lead wire 39. The holder 2H has a recess into which the lead wire 39 is inserted. The holder 2H protrudes rightward from the right end face of the left main body housing 2L. The holder 2H is disposed on the front side of the motor case 4. The holder 2H is disposed below the connector 38. In the vertical direction, the holder 2H is disposed above the hook rib 4F. The lead wire 39 is held by the holder 2H between the holder mechanism 4H and the connector 38.

[0190] As shown in FIG. 19 , an electronic component 11D is disposed between the controller 11 and the light emitter unit 90 in the front-to-rear direction. An example of the electronic component 11D is a capacitor. The electronic component 11D is housed in the main body portion 21 or the protrusion portion 22 of the main housing 2. The electronic component 11D is disposed below the motor case 4. In the left-to-right direction, the center of the electronic component 11D and the center of the motor case 4 coincide with each other. The electronic component 11D is fixed to the main body portion 21 or the protrusion portion 22. The electronic component 11D may also be fixed to the underside of the motor case 4.

[0191] A lead wire 390 is connected to the electronic component 11D. The holder mechanism 4H holds the lead wire 390 connected to the electronic component 11D. When the controller 11 and the electronic component 11D are connected by the lead wire 390, the holder mechanism 4H can hold an intermediate portion of the lead wire 390 connecting the controller 11 and the electronic component 11D.

[0192] [Motor case and gear case] FIG. 21 is an exploded perspective view of a portion of the impact tool 1 according to the embodiment, viewed from the right front side. FIG. 22 is an exploded perspective view of a portion of the impact tool 1 according to the embodiment, viewed from the left rear side. FIG. 23 is an exploded perspective view of the motor case 4 and the baffle plate 30 according to the embodiment, viewed from the right front side. FIG. 24 is a view of the motor case 4, the inner member 80, and the stator 47 according to the embodiment, viewed from above. FIG. 25 is a view of the motor case 4, the inner member 80, and the stator 47 according to the embodiment, viewed from the right lower rear side. FIG. 26 is an exploded perspective view of the motor case 4, the inner member 80, and the stator 47 according to the embodiment, viewed from the right front side. FIG. 27 is an exploded perspective view of the motor case 4, the inner member 80, and the stator 47 according to the embodiment, viewed from the left rear side. FIG. 28 is an exploded perspective view of the motor case 4, the inner member 80, and the stator 47 according to the embodiment, viewed from the right lower rear side. FIG. 29 is an exploded perspective view of the gear case 5 and the bearing cover 40 according to the embodiment, viewed from the right rear side.

[0193] In the following description, the direction parallel to the motor rotation shaft MX will be referred to as the axial direction, the direction circumferentially around the motor rotation shaft MX will be referred to as the circumferential direction or rotation direction, and the radial direction of the motor rotation shaft MX will be referred to as the radial direction. In addition, in the radial direction, a position close to or approaching the motor rotation shaft MX will be referred to as the radially inner direction, and a position farther from or away from the motor rotation shaft MX will be referred to as the radially outer direction.

[0194] The motor case 4 holds the stator 47. The motor case 4 holds the stator 47 via an inner member 80. The motor case 4 is disposed below the gear case 5. The motor case 4 is fixed to the gear case 5.

[0195] The motor case 4 is made of a magnesium alloy. An example of the magnesium alloy that can be used to form the motor case 4 is MDC1D, an Mg-Al-Zn magnesium alloy. The motor case 4 is manufactured by die casting. The specific gravity of a magnesium alloy is smaller than that of aluminum. The strength of a magnesium alloy is greater than that of synthetic resins such as polycarbonate resin. By manufacturing the motor case 4 from a magnesium alloy, the motor case 4 can be made both strong and lightweight.

[0196] The motor case 4 has a cylindrical portion 4A arranged around the motor 10, a lower wall portion 4B arranged at the lower end of the cylindrical portion 4A, protrusions 4D provided on the upper left and right sides of the cylindrical portion 4A, and a plurality of screw bosses 4P arranged around the upper end of the cylindrical portion 4A. The cylindrical portion 4A, the lower wall portion 4B, the protruding portion 4D, and the screw boss 4P are integral with each other.

[0197] The gear case 5 accommodates at least a part of the reduction mechanism 13. The gear case 5 is disposed on the rear side of the hammer case 6. The gear case 5 is fixed to the hammer case 6.

[0198] The gear case 5 is made of a magnesium alloy. An example of the magnesium alloy used to form the gear case 5 is MDC1D, an Mg-Al-Zn magnesium alloy. The gear case 5 is manufactured by die casting. The specific gravity of a magnesium alloy is smaller than that of aluminum. The strength of a magnesium alloy is greater than that of synthetic resins such as polycarbonate resin. By manufacturing the gear case 5 from a magnesium alloy, the gear case 5 can be made both strong and lightweight.

[0199] The gear case 5 is substantially cylindrical. An opening is provided in the front portion of the gear case 5. An opening is provided in the rear portion of the gear case 5. An opening is provided in the lower portion of the gear case 5. A bearing cover 40 is disposed in the opening in the rear portion of the gear case 5. The bearing cover 40 is fixed to the rear portion of the gear case 5 with three screws 40S. As shown in FIG. 29 , three screw bosses 40A are provided on the periphery of the bearing cover 40. An opening 40B is provided in each of the three screw bosses 40A. The screws 40S are inserted into the openings 40B from the rear side of the bearing cover 40. The screws 40S are inserted into threaded holes 5C provided in the rear end portion of the gear case 5. The screws 40S are inserted into the openings 40B of the screw bosses 40A from the rear side, and then inserted into the threaded holes 5C provided in the rear end portion of the gear case 5.

[0200] The gear case 5 and the hammer case 6 are fixed together by four screws 41. Four screw bosses 5B are provided on the periphery of the front of the gear case 5. Four screw bosses 6B are provided on the periphery of the rear of the hammer case 6. The screws 41 are inserted into openings provided in the screw bosses 5B of the gear case 5. The screws 41 are inserted into threaded holes provided in the screw bosses 6B of the hammer case 6. The screws 41 are inserted into the openings of the screw bosses 5B from the rear side of the screw bosses 5B, and then inserted into the threaded holes of the screw bosses 6B.

[0201] An opening is provided at the top of the motor case 4. An opening is provided at the bottom of the gear case 5. The internal spaces of the motor case 4 and the gear case 5 are connected via the opening at the top of the motor case 4 and the opening at the bottom of the gear case 5. The motor case 4 and the gear case 5 are fixed together with four screws 5S. Four screw bosses 4P are provided around the periphery of the top of the motor case 4. An opening 4Q is provided in each of the four screw bosses 4P. The screws 5S are inserted into the openings 4Q from below the screw bosses 4P. The screws 5S are inserted into threaded holes provided at the bottom end of the gear case 5. The screws 5S are inserted into the openings 4Q of the screw bosses 4P from below the screw bosses 4P, and then inserted into threaded holes provided at the bottom end of the gear case 5.

[0202] The stator 47 includes a stator core 47A, an insulator 47B fixed to the stator core 47A, and a plurality of coils 47C wound around each of the teeth of the stator core 47A via the insulator 47B. In this embodiment, there are twelve coils 47C. The coils 47C are connected via a busbar unit 47D. The busbar unit 47D is fixed to the lower part of the insulator 47B.

[0203] The busbar unit 47D has three power supply terminals 47G. Lead wires 47H are connected to the power supply terminals 47G. One lead wire 47H is connected to each power supply terminal 47G. The controller 11 and the power supply terminals 47G are connected via the lead wires 47H. The lead wires 47H supply power to the coils 47C of the stator 47. Power from the battery pack 43 is supplied to the coils 47C via the controller 11, the lead wires 47H, and the power supply terminals 47G. The motor 10 is driven based on the power supplied via the controller 11, the lead wires 47H, and the power supply terminals 47G.

[0204] An inner member 80 is disposed between the outer peripheral surface of the stator core 47A and the inner peripheral surface of the cylindrical portion 4A of the motor case 4. The inner member 80 is substantially annular. The inner member 80 is made of synthetic resin. The inner member 80 is made of glass fiber reinforced polycarbonate resin.

[0205] The inner member 80 has an annular base portion 81, outer convex portions 82 that protrude radially outward from the outer peripheral surface of the base portion 81, and inner convex portions 83 that protrude radially inward from the inner peripheral surface of the base portion 81. Four outer convex portions 82 are provided at intervals in the circumferential direction. The outer shape of the outer convex portions 82 is essentially a rectangular parallelepiped that is long in the vertical direction. Three inner convex portions 83 are provided at intervals in the circumferential direction. The inner convex portions 83 are long in the vertical direction.

[0206] After the stator 47 is press-fitted into the inner member 80, the inner member 80 is press-fitted into the motor case 4. The stator 47 is fixed to the inner member 80. The stator 47 is fixed to the motor case 4 via the inner member 80.

[0207] Groove portions 47F are provided on the outer peripheral surface of the stator core 47A. The groove portions 47F are long in the vertical direction. Three groove portions 47F are provided at intervals in the circumferential direction. The inner protrusions 83 are inserted into the groove portions 47F. By inserting the inner protrusions 83 into the groove portions 47F, the relative positions of the stator 47 and the inner member 80 in the rotational direction are prevented from changing.

[0208] A recess 4K is provided on the inner peripheral surface of the tubular portion 4A of the motor case 4. The recess 4K is long in the vertical direction. Four recesses 4K are provided at intervals in the circumferential direction. The outer protrusion 82 is inserted into the recess 4K. By inserting the outer protrusion 82 into the recess 4K, the relative position between the inner member 80 and the motor case 4 is prevented from changing in the rotational direction.

[0209] An opening 4C is provided at the rear of the tubular portion 4A of the motor case 4. An opening 4M is provided at the rear of the bottom wall portion 4B of the motor case 4. A reinforcing rib 4N is provided at the boundary between the openings 4C and 4M. The left end of the reinforcing rib 4N is fixed to the tubular portion 4A or the bottom wall portion 4B. The right end of the reinforcing rib 4N is fixed to the tubular portion 4A or the bottom wall portion 4B. The reinforcing rib 4N is integral with the tubular portion 4A and the bottom wall portion 4B. A plurality of ventilation holes 4L are provided in the bottom wall portion 4B.

[0210] As described with reference to FIG. 11 , the sensor board 50 is fixed to the busbar unit 47D of the stator 47. The sensor board 50 is housed in the motor case 4. The sensor board 50 has a circuit board 50A and a magnetic sensor 50B supported by the circuit board 50A. The sensor board 50 detects the position of the rotor 48 in the rotational direction. A plurality of lead wires 50C are connected to the sensor board 50. As shown in FIG. 25 , five lead wires 50C are connected to the sensor board 50. The lead wires 50C connect the sensor board 50 and the controller 11. A detection signal of the magnetic sensor 50B is transmitted to the controller 11 via the lead wires 50C. The controller 11 controls the motor 10 based on the detection signal of the magnetic sensor 50B.

[0211] 25, lead wires 47H connecting power supply terminals 47G of stator 47 to controller 11 pass through opening 4C provided at the rear of cylindrical portion 4A. Lead wires 50C connecting sensor board 50 to controller 11 pass through opening 4M provided at the rear of bottom wall portion 4B.

[0212] The controller 11 is disposed on the rear side of the motor case 4. The power supply terminal 47G is disposed on the rear side of the stator core 47A inside the motor case 4. The lead wire 47H passes through an opening 4C provided at the rear of the cylindrical portion 4A, thereby preventing the lead wire 47H from being excessively bent or from being subjected to excessive tension.

[0213] The controller 11 is disposed on the rear side of the motor case 4. The sensor board 50 is disposed below the stator core 47A inside the motor case 4. The lead wire 50C passes through an opening 4M provided at the rear of the bottom wall portion 4B, thereby preventing the lead wire 50C from being excessively bent or from being subjected to excessive tension.

[0214] By arranging the reinforcing rib 4N at the boundary between the opening 4C and the opening 4M, the strength of the motor case 4 is prevented from decreasing.

[0215] A baffle plate 30 is disposed at the upper end of the motor case 4. The baffle plate 30 has an annular base portion 30A and four screw bosses 30B provided on the periphery of the base portion 30A. Openings 30C are provided in the screw bosses 30B.

[0216] The protruding portion 4D of the motor case 4 has recessed portions 4E. The recessed portions 4E are recessed downward from the upper surface of the protruding portion 4D. The protruding portions 4D are provided at the upper part of the left side surface of the tubular portion 4A and at the upper part of the right side surface of the tubular portion 4A. Two recessed portions 4E are provided in the front-rear direction on the protruding portion 4D on the left side surface of the tubular portion 4A. Two recessed portions 4E are provided in the front-rear direction on the protruding portion 4D on the right side surface of the tubular portion 4A. A screw hole 4R is provided in each of the four recessed portions 4E.

[0217] The base portion 30A is inserted into the opening at the upper end of the cylindrical portion 4A. With the base portion 30A inserted into the opening at the upper end of the cylindrical portion 4A, the screw boss 30B is inserted into the recess 4E. With the screw boss 30B inserted into the recess 4E, the opening 30C and the screw hole 4R are aligned.

[0218] The baffle plate 30 is fixed to the upper end of the motor case 4 with four screws 30S. The screws 30S are inserted into openings 30C from above the screw bosses 30B. The screws 30S are inserted into threaded holes 4R provided in the recesses 4E of the motor case 4. The screws 30S are inserted into the openings 30C of the screw bosses 30B from above, and then inserted into the threaded holes 4R provided in the motor case 4. The screws 30S are fastened to the threaded holes 4R.

[0219] [Grip section] FIG. 30 is a view of the impact tool 1 according to the embodiment, as seen from the right side. The grip portion 23 is held by an operator. The grip portion 23 is arranged on the rear side of the main body 21. The grip portion 23 includes a rear grip portion 23A extending upward from the rear portion of the controller housing portion 24, and an upper grip portion 23B extending forward from the upper end of the rear grip portion 23A. The lower end of the rear grip portion 23A is connected to the controller housing 24. The upper end of the rear grip portion 23A is connected to the rear end of the upper grip portion 23B. The front end of the upper grip portion 23B is connected to the top of the main body 21. The grip portion 23, the main body 21, and the controller housing 24 form a D-shaped handle. The D-shaped handle is arranged on the rear side of the motor 10.

[0220] The overall length Lt of the impact tool 1 is 440 mm or less. In the embodiment, the overall length Lt of the impact tool 1 is 435 mm. The overall length Lt of the impact tool 1 refers to the maximum dimension of the impact tool 1 in the front-rear direction parallel to the output rotation axis AX. As shown in FIG. 30 , in the embodiment, the overall length Lt of the impact tool 1 is the distance in the front-rear direction between the front end of the anvil 16 and the rear end of the main body housing 2. The rear end of the main body housing 2 is the rear end of the controller accommodating portion 24. Because the overall length Lt of the impact tool 1 is 440 mm or less, the impact tool 1 can be made smaller, improving workability.

[0221] The spatial length Lg of the grip portion 23 is 90 mm or more. In the embodiment, the spatial length Lg of the grip portion 23 is 92 mm. The spatial length Lg of the grip portion 23 refers to the maximum dimension of the inner space of the grip portion 23 in the front-rear direction parallel to the output rotation axis AX. The grip portion 23, the main body 21, and the controller accommodating portion 24 form a D-shaped handle. The inner space of the grip portion 23 refers to the space surrounded by the grip portion 23, the main body 21, and the controller accommodating portion 24. As shown in FIG. 30 , in the embodiment, the spatial length Lg of the grip portion 23 is the distance in the front-rear direction between the lower end of the front surface of the rear grip portion 23A and the rear end of the main body 21.

[0222] 31 and 32 are diagrams showing examples of how to grip the grip portion 23 according to this embodiment. Fig. 31 shows a state in which the operator's right hand is gripping the rear grip portion 23A. Fig. 32 shows a state in which the operator's right hand is gripping a part of the rear grip portion 23A and also gripping the upper grip portion 23B.

[0223] 31, while holding rear grip portion 23A with the right hand, the operator can pull trigger lever 17A rearward with the index finger and middle finger. Also, while holding rear grip portion 23A with the right hand, the operator can slide forward / reverse rotation switch lever 29 forward or backward with, for example, the index finger.

[0224] 32, while holding rear grip portion 23A and upper grip portion 23B with the right hand, the operator can pull trigger lever 17A rearward with his / her middle finger and ring finger. Also, while holding rear grip portion 23A and upper grip portion 23B with the right hand, the operator can slide forward / reverse rotation switch lever 29 forward / backward with, for example, his / her index finger.

[0225] As shown in Figure 32, depending on the position of the work target or the presence of obstacles around the work target, the worker may pull the trigger lever 17A while gripping the rear grip portion 23A and the upper grip portion 23B. That is, depending on the work situation, the worker may be able to improve workability by gripping the upper grip portion 23B. In this embodiment, the spatial length Lg of the grip portion 23 is 90 mm or more, making it easy for the worker to grip the upper grip portion 23B. This improves workability.

[0226] [Interface Panel] Fig. 33 is a perspective view from the right rear side showing the interface panel 19 according to the embodiment. Fig. 34 is a perspective view from the right rear side for explaining the holding structure of the interface panel 19 according to the embodiment. Fig. 35 is an exploded perspective view from the right rear side showing the interface panel 19 according to the embodiment.

[0227] The interface panel 19 is disposed in the panel holding portion 25 of the main body housing 2. The panel holding portion 25 is disposed so as to extend upward from the front of the controller accommodating portion 24 toward the front side. The surface of the interface panel 19 is inclined downward toward the rear side. Because the interface panel 19 is disposed in the panel holding portion 25, the operator can easily view the interface panel 19 while gripping the grip portion 23. In other words, because the interface panel 19 is inclined downward toward the rear side, the operator can easily view the interface panel 19 while working with the impact tool 1.

[0228] As shown in FIG. 33, the interface panel 19 has a striking force adjustment button 19A, a light intensity adjustment button 19B, an application button 19C, four adjustment light emitters 19D, and two application light emitters 19E. The striking force adjustment button 19A is located to the left of the light intensity adjustment button 19B. The light intensity adjustment button 19B is located to the left of the application button 19C. The four adjustment light emitters 19D are located in the left-right direction. The two application light emitters 19E are located in the up-down direction. The four adjustment light emitters 19D are located above the striking force adjustment button 19A and the light intensity adjustment button 19B. The upper application light emitter 19E is located to the right of the adjustment light emitter 19D. The lower application light emitter 19E is located between the light intensity adjustment button 19B and the application button 19C in the left-right direction.

[0229] The impact force of the impact mechanism 15 is adjusted by pressing the impact force adjustment button 19A. The impact force can be adjusted in four stages. Pressing the impact force adjustment button 19A once decreases the impact force by one stage. Pressing the impact force adjustment button 19A once when the impact force is at its minimum value returns the impact force to its maximum value.

[0230] The light intensity of the light emitter unit 90 is adjusted by pressing the light intensity adjustment button 19B. The light intensity can be adjusted in four stages. Pressing the light intensity adjustment button 19B once decreases the light intensity by one stage. Pressing the light intensity adjustment button 19B once when the light intensity is at its minimum value returns the light intensity to its maximum value.

[0231] The four adjustment light emitters 19D light up or go out based on the striking force adjusted by operating the striking force adjustment button 19A. When the striking force is at the lowest level, one adjustment light emitter 19D lights up. When the striking force is one level higher than the lowest level, two adjustment light emitters 19D light up. When the striking force is two levels higher than the lowest level, three adjustment light emitters 19D light up. When the striking force is at the highest level, four adjustment light emitters 19D light up.

[0232] The application button 19C is operated, for example, to adjust an adjustment item set by an operator. The two application light emitters 19E are turned on or off based on the adjustment value of the adjustment item adjusted by operating the application button 19C.

[0233] The interface panel 19 is sandwiched between the left and right main body housings 2L and 2R in the left-right direction. In the panel holding portion 25, the left main body housing 2L has a recess 25L in which the left portion of the interface panel 19 is placed. The right main body housing 2R has a recess 25R in which the right portion of the interface panel 19 is placed. The left portion of the interface panel 19 fits into the recess 25L. The right portion of the interface panel 19 fits into the recess 25R.

[0234] 35, the interface panel 19 has a plastic panel 190, a sheet 191, and a display / operation board 192. The display / operation board 192 faces the back surface of the plastic panel 190. The plastic panel 190 and the display / operation board 192 are fixed together with three screws 193. The sheet 191 is attached to the surface of the plastic panel 190.

[0235] Four adjustment light emitters 19D and two application light emitters 19E are mounted on the surface of the display / operation board 192. Each of the adjustment light emitters 19D and application light emitters 19E is a light-emitting diode. Also mounted on the surface of the display / operation board 192 are a microswitch 192A corresponding to the striking force adjustment button 19A, a microswitch 192B corresponding to the light intensity adjustment button 19B, and a microswitch 192C corresponding to the application button 19C.

[0236] The sheet 191 has an impact force adjustment button 19A, a light intensity adjustment button 19B, an application button 19C, four transparent portions 191A through which light from the adjustment light emitter 19D passes, and two transparent portions 191B through which light from the application light emitter 19E passes.

[0237] The resin panel 190 has an elastic deformation portion 190A arranged between the impact force adjustment button 19A and the microswitch 192A, an elastic deformation portion 190B arranged between the light intensity adjustment button 19B and the microswitch 192B, and an elastic deformation portion 190C arranged between the application button 19C and the microswitch 192C.

[0238] When the striking force adjustment button 19A is pressed, the elastic deformation portion 190A is elastically deformed and the microswitch 192A is pressed. By pressing the microswitch 192A, the striking force of the striking mechanism 15 is adjusted.

[0239] When the light intensity adjustment button 19B is pressed, the elastic deformation portion 190B is elastically deformed and the microswitch 192B is pressed. By pressing the microswitch 192B, the light emission intensity of the light emitter unit 90 is adjusted.

[0240] When application button 19C is pressed, elastic deformation portion 190C is elastically deformed and microswitch 192C is pressed. By pressing microswitch 192C, the adjustment item set by the operator is adjusted.

[0241] The resin panel 190 also has four transmission portions 191A through which the light from the adjustment light emitter 19D passes, and two transmission portions 191B through which the light from the application light emitter 19E passes.

[0242] Resin panel 190 has a base portion 1901 and a protruding portion 1902 that protrudes upward and rearward from the rear surface of base portion 1901. Elastic deformation portion 190A, elastic deformation portion 190B, elastic deformation portion 190C, passing portion 190D, and passing portion 190E are each provided on protruding portion 1902. Sheet 191 is attached to the surface of protruding portion 1902.

[0243] As shown in FIG. 34, the panel holder 25 has a lower holder 25A that holds the lower part of the base part 1901 of the plastic panel 190, and an upper holder 25B that holds the upper part of the base part 1901 of the plastic panel 190.

[0244] The lower holding portion 25A includes grooves provided in the left main body housing 2L and the right main body housing 2R. The lower end of the base portion 1901 is inserted into the groove of the lower holding portion 25A. The lower end of the base portion 1901 fits into the groove of the lower holding portion 25A.

[0245] The upper holding portion 25B includes grooves provided in the left main body housing 2L and the right main body housing 2R. The upper end of the base portion 1901 is inserted into the grooves of the upper holding portion 25B. The upper holding portion 25B contacts the upper part of the rear surface of the base portion 1901 and the upper surface of the base portion 1901.

[0246] The left part of the protrusion 1902 fits into the recess 25L. The right part of the protrusion 1902 fits into the recess 25R. The protrusion 1902 fits into the recesses 25L and 25R, and the base part 1901 is held by the lower holding part 25A and the upper holding part 25B, whereby the interface panel 19 is fixed to the panel holding part 25.

[0247] [Impact tool operation] Next, the operation of the impact tool 1 will be described. For example, when performing a fastening operation on a workpiece, a socket to be used for the fastening operation is attached to the front end of the anvil 16. After the socket is attached to the anvil 16, the operator grips the side handle 7 with his left hand and the grip portion 23 with his right hand, and operates the trigger lever 17A so that the trigger lever 17A moves rearward. When the trigger lever 17A is operated to move rearward, power is supplied from the battery pack 43 to the motor 10, driving the motor 10 and turning on the light assembly 18. Driven by the motor 10, the rotor 48 and the rotor shaft 49 rotate. When the rotor shaft 49 rotates, the rotational force of the rotor shaft 49 is transmitted to the planetary gear 55P via the first bevel gear 53, the second bevel gear 54, and the sun gear 55S. The planetary gear 55P revolves around the sun gear 55S while rotating on its own axis while meshing with the internal teeth of the internal gear 55I. The planetary gear 55P is rotatably supported by the spindle 14 via a pin 55A. The revolution of the planetary gear 55P causes the spindle 14 to rotate at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0248] When the spindle 14 rotates while the hammer protrusion 71B and the anvil protrusion 16C are in contact with each other, the anvil 16 rotates together with the hammer 71 and the spindle 14. As the anvil 16 rotates, the fastening operation progresses.

[0249] As the fastening operation progresses, if a load equal to or greater than a predetermined value acts on the anvil 16, the rotation of the anvil 16 and the hammer 71 stops. When the spindle 14 rotates while the hammer 71 is stopped, the hammer 71 moves rearward. As the hammer 71 moves rearward, the hammer protrusion 71B and the anvil protrusion 16C are released from contact with each other. The rearward-moving hammer 71 then moves forward while rotating due to the elastic force of the first coil spring 73 and the second coil spring 74. As the hammer 71 moves forward while rotating, the anvil 16 is struck by the hammer 71 in the rotational direction. This causes the anvil 16 to rotate around the output rotation axis AX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0250] According to the embodiment, the axial elastic body 91 and the radial elastic body 92 prevent vibrations of the hammer case 6 from being transmitted to the light emitting body unit 90. Because the light emitting body unit 90 is vibration-damped, damage to the soldered connection between the substrate 95A and the LED chip 95B and damage to the wiring provided on the substrate 95A are prevented. In other words, failure of the light emitting body unit 90 is prevented.

[0251] Furthermore, according to the embodiment, the vibration-damping rubber 100 prevents vibrations of the main body housing 2 from being transmitted to the terminal 44 and the battery pack 43. The vibration-damping rubber 100 extends in three directions, i.e., the front-rear direction, the up-down direction, and the left-right direction, and therefore can dampen vibrations acting on the terminal 44 and the battery pack 43 in each of the three directions.

[0252] Furthermore, when the impact tool 1 is dropped and the battery pack 43 hits the floor or the ground, the battery holder 9 moves forward, causing the battery pack 43 to come into contact with the cushion rubber 46. This reduces the impact acting on the battery pack 43.

[0253] [effect] As described above, in the embodiment, the impact tool 1 includes the motor 10, the reduction gear mechanism 13 rotated by the motor 10, the hammer 71 rotated by the rotation of the motor 10 transmitted via the reduction gear mechanism 13, the anvil 16 struck in the rotational direction by the hammer 71, the motor case 4 that houses the motor 10, and the gear case 5 that houses the reduction gear mechanism 13. One or both of the motor case 4 and the gear case 5 are made of a magnesium alloy.

[0254] In the above configuration, since one or both of the motor case 4 and the gear case 5 are made of a magnesium alloy, it is possible to achieve both high strength and light weight for the impact tool 1. The strength of magnesium alloys is higher than that of synthetic resins, and the specific gravity of magnesium alloys is lower than that of aluminum.

[0255] In this embodiment, the motor case 4 has a holder mechanism 4H that holds the lead wire 39, which is the first lead wire that passes outside the motor case 4.

[0256] In the above configuration, the lead wire 39 is held by the holder mechanism 4H, which improves the ease of assembly when assembling the impact tool 1.

[0257] In an embodiment, the lead wire 39 is not connected to the motor 10 .

[0258] In the above configuration, the lead wire 39 that is not connected to the motor 10 is held by the holder mechanism 4H. Power is supplied to an electronic device separate from the motor 10 via the lead wire 39.

[0259] In the embodiment, the impact tool 1 includes a controller 11. The lead wire 39 is connected to the controller 11.

[0260] In the above configuration, the lead wire 39 that is not connected to the controller 11 is held by the holder mechanism 4H.

[0261] In this embodiment, the controller 11 is disposed rearward of the motor case 4. The lead wires 39 are connected to electronic components disposed forward of the motor case 4.

[0262] In the above configuration, power is supplied via lead wires 39 to electronic components arranged forward of motor case 4.

[0263] In the embodiment, the impact tool 1 includes a light emitting unit 90 including a light emitter that illuminates the front end side of the anvil 16. The electronic component includes an LED chip 95B of the light emitting unit 90.

[0264] In the above configuration, power is supplied to the LED chip 95B, which is disposed further forward than the motor case 4, via the lead wire 39. The LED chip 95B emits light when power is supplied via the lead wire 39.

[0265] In this embodiment, the impact tool 1 includes a connector 38 that is disposed forward of the motor case 4 and that supplies electricity to the light-emitting unit 90. A rear end of a lead wire 39 is connected to the controller 11. A front end of the lead wire 39 is connected to the connector 38. A holder mechanism 4H holds an intermediate portion of the lead wire 39.

[0266] In the above configuration, the middle portion of the lead wire 39 connecting the controller 11 and the connector 38 is held by the holder mechanism 4H.

[0267] In the embodiment, the holder mechanism 4H has a base rib 4G provided on the outer surface of the motor case 4 and supporting the lead wire 39 from below, and a hook rib 4F positioned above the base rib 4G on the outer surface of the motor case 4 and supporting the lead wire 39 from the side.

[0268] In the above configuration, the lead wire 39 is held by the base rib 4G and the hook rib 4F.

[0269] In this embodiment, the motor case 4 has a cylindrical portion 4A arranged around the motor 10, a lower wall portion 4B arranged at the lower end of the cylindrical portion 4A, and a protrusion 4D protruding laterally from an upper portion of the outer peripheral surface of the cylindrical portion 4A. The base rib 4G protrudes from the side surface of the cylindrical portion 4A below the protrusion 4D. The hook rib 4F protrudes downward from the lower surface of the protrusion 4D.

[0270] In the above configuration, the relative positions of the base rib 4G and the hook rib 4F are optimized so that the lead wire 39 can be held.

[0271] In this embodiment, the impact tool 1 includes a fan 12 fixed to an upper portion of a rotor shaft 49 of a motor 10, and a baffle plate 30 disposed at the upper end of the motor case 4 and facing the fan 12. The baffle plate 30 includes an annular base portion 30A inserted into the opening at the upper end of the cylindrical portion 4A, and a screw boss 30B provided on the periphery of the base portion 30A. The protrusion 4D includes a recess 4E, which is an upper recess into which the screw boss 30B is inserted when the base portion 30A is inserted into the opening at the upper end of the cylindrical portion 4A.

[0272] In the above configuration, the base portion 30A is inserted into the opening at the upper end of the cylindrical portion 4A, and the screw boss 30B is inserted into the recess 4E of the protrusion 4D, thereby reducing the amount of protrusion of the baffle plate 30 upward from the motor case 4. This prevents the impact tool 1 from becoming larger.

[0273] In this embodiment, a screw 30S inserted into an opening 30C of the screw boss 30B is coupled to a screw hole 4R provided in the recess 4E.

[0274] In the above configuration, the motor case 4 and the baffle plate 30 are fixed together by the screws 30S. Because the screws 30S are disposed inside the recesses 4E, the amount by which the screws 30S protrude upward from the baffle plate 30 is small. This prevents the impact tool 1 from becoming too large.

[0275] In the embodiment, the motor case 4 has a cylindrical portion 4A arranged around the motor 10 and a lower wall portion 4B arranged at the lower end of the cylindrical portion 4A. The impact tool 1 includes an inner member 80 made of synthetic resin and arranged between the inner peripheral surface of the cylindrical portion 4A and the outer peripheral surface of the stator core 47A of the motor 10.

[0276] In the above configuration, contact between the motor case 4 made of magnesium alloy and the stator core 47A made of iron is suppressed by the inner member 80 made of synthetic resin, so wear of the motor case 4 is suppressed.

[0277] In the embodiment, the inner member 80 has an annular base portion 81 disposed between the inner circumferential surface of the cylindrical portion 4A and the outer circumferential surface of the stator core 47A of the motor 10, an outer protrusion 82 protruding radially outward from the outer circumferential surface of the base portion 81, and an inner protrusion 83 protruding radially inward from the inner circumferential surface of the base portion 81. A recess 4K, which is an inner recess into which the outer protrusion 82 is inserted, is provided on the inner circumferential surface of the cylindrical portion 4A. A groove 47F into which the inner protrusion 83 is inserted is provided on the outer circumferential surface of the stator core 47A.

[0278] In the above configuration, the inner protrusion 83 is inserted into the groove 47F, thereby preventing the relative position between the stator 47 and the inner member 80 from changing in the rotation direction. The outer protrusion 82 is inserted into the recess 4K, thereby preventing the relative position between the inner member 80 and the motor case 4 from changing in the rotation direction.

[0279] In this embodiment, the impact tool 1 includes a controller 11 disposed rearward of the motor case 4 and controlling the motor 10, and a sensor board 50 housed in the motor case 4 and detecting the rotational position of the rotor of the motor 10. The motor case 4 includes a cylindrical portion 4A disposed around the motor 10 and a lower wall portion 4B disposed at the lower end of the cylindrical portion 4A. The stator 47 of the motor 10 includes a stator core 47A and a power terminal 47G disposed rearward of the stator core 47A inside the motor case 4. The sensor board 50 is disposed below the stator core 47A inside the motor case 4. A first opening, 4C, is provided at the rear of the cylindrical portion 4A. A second opening, 4M, is provided at the rear of the lower wall portion 4B. A second lead wire 47H connecting the power terminal 47G to the controller 11 passes through the opening 4C. A third lead wire 50C that connects the sensor board 50 and the controller 11 passes through the opening 4M.

[0280] In the above configuration, the lead wire 47H passes through the opening 4C provided at the rear of the tubular portion 4A, thereby preventing the lead wire 47H from being excessively bent or from being subjected to excessive tension. The lead wire 50C passes through the opening 4M provided at the rear of the bottom wall portion 4B, thereby preventing the lead wire 50C from being excessively bent or from being subjected to excessive tension.

[0281] In this embodiment, the motor case 4 has a reinforcing rib 4N that is provided at the boundary between the opening 4C and the opening 4M and is integral with the cylindrical portion 4A and the lower wall portion 4B.

[0282] In the above configuration, the reinforcing rib 4N is disposed at the boundary between the opening 4C and the opening 4M, thereby preventing the strength of the motor case 4 from decreasing.

[0283] In this embodiment, the impact tool 1 includes a main housing 2 made of synthetic resin that houses a motor case 4. The anvil 16 rotates around an output rotation shaft AX that extends in the front-to-rear direction. The total length Lt, which indicates the distance in the front-to-rear direction between the front end of the anvil 16 and the rear end of the main housing 2, is 440 mm or less.

[0284] With the above configuration, the impact tool 1 is prevented from becoming large, and the workability of the work using the impact tool 1 is improved.

[0285] In the embodiment, the main body housing 2 has a main body section 21 that houses the motor case 4, a grip section 23 that is arranged on the rear side of the main body section 21, and a controller accommodating section 24 that is arranged below the grip section 23. The grip section 23 includes a rear grip section 23A that extends upward from the rear of the controller accommodating section 24, and an upper grip section 23B that extends forward from the upper end of the rear grip section 23A. The front end of the upper grip section 23B is connected to the top of the main body section 21. A space length Lg, which indicates the maximum dimension in the front-to-rear direction of the space enclosed by the grip section 23, the main body section 21, and the controller accommodating section 24, is 90 mm or greater.

[0286] With the above configuration, when gripping the grip portion 23, the worker can easily grasp only the rear grip portion 23A, or can easily grasp part of the rear grip portion 23A and part of the upper grip portion 23B at the same time. Furthermore, when gripping the grip portion 23, there is little interference between the fingers and the main body portion 21, making it easy to grip. Various gripping methods are possible depending on the work situation, improving operability.

[0287] In this embodiment, the upper end of the motor case 4 and the lower end of the gear case 5 are fixed together by screws 5S.

[0288] In the above configuration, the motor case 4 and the gear case 5, which are arranged in the vertical direction, are fixed together by the screws 5S.

[0289] In this embodiment, the rotor 48 of the motor 10 rotates about a motor rotation axis MX extending in the vertical direction. The reduction mechanism 13 includes a first bevel gear 53 that rotates about the motor rotation axis MX, and a second bevel gear 54 that meshes with the first bevel gear 53 and rotates about an output rotation axis that extends in the front-rear direction.

[0290] In the above configuration, the motor rotation axis MX and the output rotation axis AX are perpendicular to each other, so that the overall length Lt of the impact tool 1 can be shortened.

[0291] In this embodiment, the impact tool 1 includes a hammer case 6 that is disposed on the front side of the gear case 5 and that houses a hammer 71. Both the motor case 4 and the hammer case 6 are made of a magnesium alloy, and the hammer case 6 is made of aluminum.

[0292] In the above configuration, both the motor case 4 and the hammer case 6 are made of magnesium alloy, which increases the strength and reduces the weight of both the motor case 4 and the hammer case 6. Since the hammer case 6 is made of aluminum, which is stronger than magnesium alloy, even if a large impact is applied to the hammer case 6 when the hammer 71 strikes the anvil 16, the hammer case 6 can withstand the impact.

[0293] [Other embodiments] In the above-described embodiment, both the motor case 4 and the gear case 5 are made of a magnesium alloy. However, one of the motor case 4 and the gear case 5 may be made of a magnesium alloy and the other may not be made of a magnesium alloy.

[0294] In the above-described embodiment, each of the axial elastic bodies 91 and the radial elastic bodies 92 is annular. The axial elastic bodies 91 may be provided separately at a plurality of positions around the second cylindrical portion 62. The radial elastic bodies 92 may be provided separately at a plurality of positions around the second cylindrical portion 62.

[0295] In the above-described embodiment, the battery holder 9 includes the left battery holder 9L and the right battery holder 9R located to the right of the left battery holder 9L. That is, the battery holder 9 can be separated into left and right parts. The battery holder 9 can also be separated into upper and lower parts.

[0296] In the above-described embodiment, the impact tool 1 is an impact wrench. The impact tool may be an impact driver. The anvil of the impact driver has an insertion hole into which the tool bit is inserted and a chuck mechanism that holds the tool bit.

[0297] In the above-described embodiment, the battery pack 43 attached to the battery holder is used as the power source for the impact tool 1. The power source for the impact tool 1 may be a commercial power source (AC power source).

[0298] In the above embodiment, the motor 10 is an inner rotor brushless motor. The motor 10 may be an outer rotor type or a brushed motor.

[0299] The electric impact tool 1 may be any other electric tool, such as an electric hammer, an electric cutter, an electric circular saw, an electric chainsaw, an electric lawn mower, an electric brush cutter, or an electric grinder. [Explanation of symbols]

[0300] 1...Impact tool, 2...Main body housing, 2B...Screw boss, 2H...Holder, 2L...Left main body housing, 2R...Right main body housing, 2S...Screw, 3...Battery housing, 3L...Left battery housing, 3R...Right battery housing, 3S...Screw, 4...Motor case, 4A...Cylinder, 4B...Lower wall, 4C...Opening (first opening), 4D...Protrusion, 4E...Recess (upper recess), 4F...Hook rib, 4G...Base rib, 4H...Holder mechanism, 4K...Recess (inner recess), 4L...Ventilation hole, 4M...Opening (second opening), 4N...Reinforcing rib, 4P...Screw boss, 4Q...Opening, 4R...Screw hole , 5...gear case, 5B...screw boss, 5C...screw hole, 5S...screw, 6...hammer case, 6B...screw boss, 7...side handle, 7A...handle portion, 7B...base portion, 8...rear bumper, 9...battery holder, 9L...left battery holder, 9R...right battery holder, 10...motor, 11...controller, 11A...controller case, 11B...circuit board, 11C...electronic components, 11D...electronic components, 12...fan, 13...reduction mechanism, 14...spindle, 14A...flange portion, 14B...spindle shaft portion, 14C...protrusion portion, 14D...spindle groove, 15...impact mechanism, 16...anvil, 16A...anvil recess, 16B...anvil shaft portion, 16C...anvil protrusion portion, 17...trigger switch, 17A...trigger lever, 17B...switch body, 18...light assembly, 19...interface panel, 19A...impact force adjustment button, 19B...light intensity adjustment button, 19C...application button, 19D...adjustment light emitter, 19E...application light emitter, 20...hook assembly, 20A...base portion, 20B...ring portion, 21...main body portion, 22...protrusion portion, 23...grip portion, 23A...rear grip portion, 23B...upper grip portion, 2 4...controller housing, 25...panel holding portion, 25A...lower holding portion, 25B...upper holding portion, 25L...recess, 25R...recess, 26...intake port, 27...exhaust port, 28...holding protrusion, 29...forward / reverse switching lever, 30...baffle plate, 30A...base portion, 30B...screw boss, 30C...opening, 30S...screw, 31...holder support portion, 32...elastic member support portion, 33...spring holding portion, 34...rubber holding portion, 35...guide portion, 36...holding recess, 37...opening, 38...connector, 39...lead wire (first lead wire), 40...bearing cover, 40A...screw boss, 40B...opening,40S...Screw, 41...Screw, 42...Tightening mechanism, 42A...Screw, 42B...Dial, 43...Battery pack, 44...Terminal, 44A...Terminal plate, 44B...Terminal terminal, 45...Spring, 46...Cushion rubber, 46A...Main body, 46B...Convex portion, 47...Stator, 47A...Stator core, 47B...Insulator, 47C...Coil, 47D...Busbar unit, 47E...Screw, 47F...Groove portion, 47G...Power terminal, 47H...Lead wire (second lead wire), 48...Rotor, 48A...Rotor core, 48B...Rotor magnet, 49...Rotor shaft , 50...sensor board, 50A...circuit board, 50B...magnetic sensor, 50C...lead wire (third lead wire), 50S...screw, 51...rotor bearing, 52...rotor bearing, 53...first bevel gear, 54...second bevel gear, 55...planetary gear mechanism, 55A...pin, 55S...sun gear, 55P...planetary gear, 55I...internal gear, 56...gear bearing, 57...gear bearing, 58...spindle bearing, 61...first cylindrical portion, 62...second cylindrical portion, 62A...convex portion, 62B...washer groove, 63...front wall portion, 64...annular rib portion, 71...hammer, 71A...hammer body, 71B...hammer protrusion portion , 71C...recess, 71D...hammer groove, 72...ball, 73...first coil spring, 74...second coil spring, 75...third coil spring, 76...first washer, 77...second washer, 78...ball, 79...anvil bearing, 79A...recess, 80...inner member, 81...base portion, 82...outer convex portion, 83...inner convex portion, 90...light-emitting body unit, 91...axial elastic body, 91A...axial base portion, 91B...rear support portion, 91C...front support portion, 92...radial elastic body, 92A...radial base portion, 92B...rear support portion, 92C...front support portion, 93...washer, 94 ...Sealing member, 95...Chip-on-board light-emitting diode, 95A...Substrate, 95B...LED chip, 95C...Phosphor, 96...Optical member, 100...Vibration-proof rubber, 100L...Left vibration-proof rubber, 100R...Right vibration-proof rubber, 101...First part, 102...Second part, 103...Third part, 104...Fourth part, 106...Protrusion, 107...Retaining groove, 120...Front bumper, 121...Cylindrical part, 122...Recess, 190...Resin panel, 190A...Elastic deformation part, 190B...Elastic deformation part, 190C...Elastic deformation part, 190D...Passing part, 190E...Passing part, 191...Sheet, 191A...Transmitting part,191B...Transparent portion, 192...Display operation board, 192A...Microswitch, 192B...Microswitch, 192C...Microswitch, 193...Screw, 390...Lead wire, 901...Terminal holding portion, 902...Convex portion, 903...Slide portion, 1901...Base portion, 1902...Protrusion portion, AX...Output rotating shaft, Lt...Total length, Lg...Spatial length, MX...Motor rotating shaft.

Claims

1. A motor; a reduction mechanism rotated by the motor; a hammer rotated by the rotation of the motor transmitted via the reduction mechanism; an anvil that is struck in a rotational direction by the hammer; a motor case that houses the motor; a gear case that houses the reduction mechanism, One or both of the motor case and the gear case are made of a magnesium alloy. Impact tool.

2. the motor case has a holder mechanism that holds a first lead wire that passes outside the motor case; The impact tool according to claim 1 .

3. the first lead is not connected to the motor; The impact tool according to claim 2.

4. Equipped with a controller, the first lead is connected to the controller; The impact tool according to claim 3.

5. the controller is disposed rearward of the motor case, The first lead wire is connected to an electronic component disposed forward of the motor case.

5. The impact tool according to claim 4.

6. a light-emitting unit including a light-emitting body that illuminates the front end side of the anvil; The electronic component includes an LED chip of the light-emitting unit.

6. The impact tool according to claim 5.

7. a connector disposed forward of the motor case and configured to supply electricity to the light-emitting unit; a rear end of the first lead wire connected to the controller; a front end of the first lead wire connected to the connector; the holder mechanism holds a middle portion of the first lead wire; 7. The impact tool according to claim 6.

8. The holder mechanism includes: a base rib provided on an outer surface of the motor case and supporting the first lead wire from below; a hook rib disposed on the outer surface of the motor case above the base rib and supporting the first lead wire from a lateral side thereof. The impact tool according to claim 2.

9. The motor case is a cylindrical portion disposed around the motor; a lower wall portion disposed at a lower end of the cylindrical portion; a protrusion protruding laterally from an upper portion of the outer circumferential surface of the cylindrical portion, the base rib protrudes from the side surface of the cylindrical portion below the protrusion, The hook rib protrudes downward from the lower surface of the protrusion.

9. The impact tool according to claim 8.

10. a fan fixed to an upper portion of the rotor shaft of the motor; a baffle plate disposed at an upper end of the motor case and facing the fan, The baffle plate is a base portion having an annular shape that is inserted into an opening at an upper end of the cylindrical portion; a screw boss provided on a peripheral edge of the base portion, the protrusion has an upper recess into which the screw boss is inserted when the base is inserted into the opening at the upper end of the cylindrical portion.

10. The impact tool according to claim 9.

11. A screw inserted into the opening of the screw boss is coupled to a screw hole provided in the upper recess.

11. An impact tool according to claim 10.

12. The motor case is a cylindrical portion disposed around the motor; a lower wall portion disposed at a lower end of the cylindrical portion, an inner member made of synthetic resin disposed between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the stator core of the motor; The impact tool according to claim 1 .

13. The inner member is an annular base portion disposed between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of a stator core of the motor; an outer convex portion that protrudes radially outward from an outer peripheral surface of the base portion; an inner convex portion that protrudes radially inward from an inner circumferential surface of the base portion, an inner recess into which the outer protrusion is inserted is provided on an inner circumferential surface of the cylindrical portion; a groove into which the inner protrusion is inserted is provided on the outer peripheral surface of the stator core; 13. An impact tool according to claim 12.

14. a controller disposed on the rear side of the motor case and controlling the motor; a sensor board that is housed in the motor case and detects the position of the rotor of the motor in a rotational direction, The motor case is a cylindrical portion disposed around the motor; a lower wall portion disposed at a lower end of the cylindrical portion, the stator of the motor includes a stator core and a power supply terminal disposed inside the motor case and rearward of the stator core; the sensor board is disposed inside the motor case and below the stator core, a first opening is provided at a rear portion of the cylindrical portion; a second opening is provided at the rear of the lower wall portion; a second lead wire connecting the power supply terminal and the controller passes through the first opening; a third lead wire connecting the sensor substrate and the controller passes through the second opening; The impact tool according to claim 2.

15. The motor case is a reinforcing rib provided at the boundary between the first opening and the second opening and integral with the tubular portion and the lower wall portion; 15. An impact tool according to claim 14.

16. a main body housing made of synthetic resin that houses the motor case; The anvil rotates around an output rotation shaft extending in the front-rear direction, The total length, which indicates the distance in the front-to-rear direction between the front end of the anvil and the rear end of the main body housing, is 440 mm or less. The impact tool according to claim 1 .

17. The main body housing includes: a main body that houses the motor case; a grip portion disposed on the rear side of the main body portion; a controller housing portion disposed below the grip portion, The grip portion is a rear grip portion extending upward from a rear portion of the controller housing portion; an upper grip portion extending forward from an upper end of the rear grip portion, a front end of the upper grip portion connected to an upper portion of the main body portion; a space length, which indicates the maximum dimension in the front-to-rear direction of the space surrounded by the grip portion, the main body portion, and the controller housing portion, is 90 mm or more; 17. An impact tool according to claim 16.

18. The upper end of the motor case and the lower end of the gear case are fixed together with screws. The impact tool according to claim 1 .

19. The rotor of the motor rotates around a motor rotation shaft extending in the vertical direction, the reduction mechanism includes a first bevel gear that rotates about the motor rotation shaft, and a second bevel gear that meshes with the first bevel gear and rotates about an output rotation shaft that extends in the front-rear direction.

19. An impact tool according to claim 18.

20. a hammer case disposed on the front side of the gear case and accommodating the hammer; Both the motor case and the hammer case are made of a magnesium alloy, The hammer case is made of aluminum. The impact tool according to claim 1 .

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