Impact tool

Abstract

The invention provides an impact tool capable of achieving both high strength and light weight of the impact tool. The impact tool includes a motor, a speed reduction mechanism that is rotated by the motor, a hammer that is rotated by rotation of the motor transmitted through the speed reduction mechanism, an anvil that is hit by the hammer in a rotation direction, a motor housing that houses the motor, and a gearbox that houses the speed reduction mechanism. One or both of the motor housing and the gearbox are made of magnesium alloy.

Description

Technical Field

[0001] The technology disclosed in this specification relates to an impact tool. Background Art

[0002] In the technical field related to impact tools, a handheld electric power tool such as that disclosed in Patent Document 1 is known.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent No. 8,496,366 Summary of the Invention

[0006] As impact tools become more powerful, the hammer strikes the anvil, inflicting a greater impact on the tool's components. To withstand the impact, components must be constructed from high-strength materials. However, the higher the specific gravity of high-strength materials, the heavier the impact tool, potentially reducing workability.

[0007] An object of the technology disclosed in this specification is to achieve both high strength and light weight of an impact tool.

[0008] This specification discloses an impact tool. The impact tool comprises: 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 in the rotational direction by the hammer; a motor housing housing the motor; and a gear box housing the reduction mechanism. One or both of the motor housing and the gear box are made of a magnesium alloy.

[0009] Effects of the Invention

[0010] According to the technology disclosed in this specification, it is possible to achieve both high strength and light weight of an impact tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view showing the impact tool according to the embodiment as viewed from the left front side.

[0012] Figure 2 It is a perspective view showing the impact tool according to the embodiment as viewed from the right rear side.

[0013] Figure 3 This is a diagram showing the impact tool according to the embodiment as viewed from the right side.

[0014] Figure 4 This is a diagram showing the impact tool according to the embodiment as viewed from the left side.

[0015] Figure 5This is a diagram of the impact tool according to the embodiment as viewed from the rear side.

[0016] Figure 6 This is a diagram of the impact tool according to the embodiment as viewed from the front.

[0017] Figure 7 This is a diagram showing the impact tool according to the embodiment as viewed from above.

[0018] Figure 8 This is a diagram showing the impact tool according to the embodiment as viewed from below.

[0019] Figure 9 It is a cross-sectional view showing the impact tool according to the embodiment.

[0020] Figure 10 It is a cross-sectional view showing the impact tool according to the embodiment.

[0021] Figure 11 It is a cross-sectional view showing a part of the impact tool according to the embodiment.

[0022] Figure 12 It is a cross-sectional view showing a part of the impact tool according to the embodiment.

[0023] Figure 13 It is a cross-sectional view showing a part of the impact tool according to the embodiment.

[0024] Figure 14 It is an exploded perspective view showing the lamp assembly according to the embodiment as viewed from the right front side.

[0025] Figure 15 It is a cross-sectional view showing a part of the impact tool according to the embodiment.

[0026] Figure 16 It is a cross-sectional view showing a part of the impact tool according to the embodiment.

[0027] Figure 17 It is an exploded perspective view showing the battery case and the battery holder according to the embodiment as viewed from the right front side.

[0028] Figure 18 This is a diagram showing a portion of the impact tool according to the embodiment as viewed from the right side.

[0029] Figure 19 It is a perspective view showing a portion of the impact tool according to the embodiment as viewed from the right front side.

[0030] Figure 20 It is a perspective view showing a portion of the impact tool according to the embodiment as viewed from the lower right rear side.

[0031] Figure 21 This is an exploded perspective view showing a portion of the impact tool according to the embodiment as viewed from the right front side.

[0032] Figure 22 This is an exploded perspective view showing a portion of the impact tool according to the embodiment as viewed from the left rear side.

[0033] Figure 23 It is an exploded perspective view showing the motor case and the baffle according to the embodiment as viewed from the right front side.

[0034] Figure 24 This is a diagram showing a motor case, inner components, and a stator according to an embodiment as viewed from above.

[0035] Figure 25 This is a diagram showing the motor case, inner components, and stator according to the embodiment as viewed from the lower right rear side.

[0036] Figure 26 This is an exploded perspective view showing the motor case, inner components, and stator according to the embodiment, as viewed from the right front side.

[0037] Figure 27 This is an exploded perspective view showing the motor case, inner components, and stator according to the embodiment, as viewed from the left rear side.

[0038] Figure 28 This is an exploded perspective view showing the motor case, inner components, and stator according to the embodiment, as viewed from the lower right rear side.

[0039] Figure 29 It is an exploded perspective view showing the gear box and the bearing cap according to the embodiment as viewed from the right rear side.

[0040] Figure 30 This is a diagram showing the impact tool according to the embodiment as viewed from the right side.

[0041] Figure 31 This is a diagram showing an example of a method of grasping a grip portion according to the embodiment.

[0042] Figure 32 This is a diagram showing an example of a method of grasping a grip portion according to the embodiment.

[0043] Figure 33 It is a perspective view showing the interface panel according to the embodiment as viewed from the right rear side.

[0044] Figure 34 This is a perspective view for explaining the interface panel holding structure according to the embodiment, as viewed from the right rear side.

[0045] Figure 35It is an exploded perspective view showing the interface panel according to the embodiment as viewed from the right rear side.

[0046] Description of Reference Numerals

[0047] 1…Impact tool; 2…Main body housing; 2B…Threaded 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 housing; 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…Vent; 4M…Opening (second opening); 4N…Reinforcement rib; 4P…Threaded boss; 4Q…Opening; 4R…Threaded hole; 5…Gear case; 5B…Threaded boss; 5C…Threaded hole; 5S…Screw; 6…Hammer Sub-housing; 6B…threaded boss; 7…side handle; 7A…handle portion; 7B…base portion; 8…rear buffer; 9…battery holder; 9L…left battery holder; 9R…right battery holder; 10…motor; 11…controller; 11A…controller housing; 11B…circuit board; 11C…electronic component; 11D…electronic component; 12…fan; 13…speed reduction mechanism; 14…spindle; 14A…flange portion; 14B…spindle shaft portion; 14C…protrusion; 14D…spindle groove; 15…striking mechanism; 16…anvil; 16A…anvil recess; 16B…anvil shaft portion; 16C…anvil protrusion; 17…trigger switch; 17A…trigger shifter; 17B…switch body; 18…lamp assembly 19…Interface panel; 19A…Strike force adjustment button; 19B…Light intensity adjustment button; 19C…Application button; 19D…Illuminator adjustment button; 19E…Illuminator application button; 20…Hook assembly; 20A…Base; 20B…Ring; 21…Main body; 22…Protrusion; 23…Handle; 23A…Rear handle; 23B…Upper handle; 24…Controller storage; 25…Panel retaining portion; 25A…Lower retaining portion; 25B…Upper retaining portion; 25L…Recess; 25R…Recess; 26…Air inlet; 27…Exhaust port; 28…Retaining protrusion; 29…Forward / reverse switching shifter; 30…Baffle; 30A…Base; 30B…Threaded boss; 30C…Opening; 30S…Screw; 31… Holder support portion; 32…elastic member support portion; 33…spring retaining portion; 34…rubber retaining portion; 35…guide portion; 36…retaining recess; 37…opening; 38…connector; 39…lead (first lead); 40…bearing cap; 40A…threaded boss; 40B…opening; 40S…screw; 41…screw; 42…fastening mechanism; 42A…screw; 42B…turntable; 43…battery pack; 44…connector; 44A…connector plate; 44B…connector terminal; 45…spring; 46…rubber buffer; 46A…main body; 46B…protrusion; 47…stator; 47A…stator core; 47B…insulator; 47C…coil; 47D…busbar unit; 47E…screw; 47F…slot;47G…Power terminal; 47H…Lead (2nd lead); 48…Rotor; 48A…Rotor core; 48B…Rotor magnet; 49…Rotor shaft; 50…Sensor substrate; 50A…Circuit board; 50B…Magnetic sensor; 50C…Lead (3rd lead); 50S…Screw; 51…Rotor bearing; 52…Rotor bearing; 53…1st bevel gear; 54…2nd 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…1st cylinder; 62…2nd cylinder ; 62A… convex portion; 62B… washer groove; 63… front wall portion; 64… annular rib portion; 71… hammer; 71A… hammer body; 71B… hammer protrusion; 71C… recessed portion; 71D… hammer groove; 72… ball bearing; 73… first coil spring; 74… second coil spring; 75… third coil spring; 76… first washer; 77… second washer; 78… ball bearing; 79… anvil bearing; 79A… recessed portion; 80… inner member; 81… base portion; 82… outer convex portion; 83… inner convex portion; 90… illuminator 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...gasket; 94...sealing member; 95...on-board chip light emitting diode; 95A...substrate; 95B...LED chip; 95C...phosphor; 96...optical member; 100...vibration-isolating rubber; 100L...left vibration-isolating rubber; 100R...right vibration-isolating rubber; 101...first portion; 102...second portion; 103...third portion; 104...fourth portion; 106...protrusion; 107...holding groove; 120...front buffer; 121...cylindrical portion; 122...recess; 1 90…resin panel; 190A…elastic deformation portion; 190B…elastic deformation portion; 190C…elastic deformation portion; 190D…passing portion; 190E…passing portion; 191…sheet; 191A…transmissive portion; 191B…transmissive portion; 192…display operation board; 192A…micro switch; 192B…micro switch; 192C…micro switch; 193…screw; 390…lead wire; 901…connector retaining portion; 902…protrusion; 903…sliding portion; 1901…base portion; 1902…protrusion; AX…output rotary shaft; Lt…total length; Lg…space length; MX…motor rotary shaft. DETAILED DESCRIPTION

[0048] In one or more embodiments, an 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 in a rotational direction by the hammer; a motor housing accommodating the motor; and a gear box accommodating the reduction mechanism. One or both of the motor housing and the gear box are made of a magnesium alloy.

[0049] According to the above configuration, since one or both of the motor housing and the gear box are made of magnesium alloy, the impact tool can be both high-strength and lightweight. Magnesium alloys are stronger than synthetic resins. Magnesium alloys have a lower specific gravity than aluminum.

[0050] In one or more embodiments, the motor housing includes a holder mechanism that holds the first lead wire passing from the outside of the motor housing.

[0051] According to the above configuration, since the first lead is held by the holder mechanism, the assembling efficiency when assembling the impact tool is improved.

[0052] In one or more embodiments, the first lead is not connected to the motor.

[0053] According to the above configuration, the first lead wire not connected to the motor is held by the holder mechanism, and power is supplied to other electronic devices other than the motor via the first lead wire.

[0054] In one or more embodiments, the impact tool includes a controller. The first lead is connected to the controller.

[0055] According to the above configuration, the first lead wire that is not connected to the controller is held by the holder mechanism.

[0056] In one or more embodiments, the controller is arranged further rearward than the motor housing. The first lead is connected to an electronic component arranged further forward than the motor housing.

[0057] According to the above configuration, electric power is supplied to the electronic component arranged on the front side of the motor case via the first lead.

[0058] In one or more embodiments, the impact tool includes a light emitting unit including a light emitting body for irradiating the front end side of the anvil, and the electronic component includes an LED chip of the light emitting unit.

[0059] According to the above configuration, electric power is supplied to the LED chip disposed forward of the motor housing via the first lead wire. The LED chip emits light by the electric power supplied via the first lead wire.

[0060] In one or more embodiments, the impact tool includes a connector positioned forward of the motor housing and electrically connected to the light-emitting unit. A rear end of a first lead is connected to a controller. A front end of the first lead is connected to the connector. A retainer mechanism retains an intermediate portion of the first lead.

[0061] According to the above configuration, the intermediate portion of the first lead wire connecting the controller and the connector is held by the holder mechanism.

[0062] In one or more embodiments, the retaining member mechanism comprises: a base rib, which is provided on the outer surface of the motor housing and supports the first lead from the bottom side; and a hook rib, which is arranged on the outer surface of the motor housing at a position further upward than the base rib and supports the first lead from the side.

[0063] According to the above configuration, the first lead is held by the base rib and the hook rib.

[0064] In one or more embodiments, the motor housing includes a cylindrical portion disposed around the motor, a lower wall portion disposed at the lower end of the cylindrical portion, and a protrusion protruding laterally from an upper portion of an outer circumferential surface of the cylindrical portion. A base rib protrudes from a side surface of the cylindrical portion at a position lower than the protrusion. A hook rib protrudes downward from a lower surface of the protrusion.

[0065] According to the above configuration, the relative position between the base rib and the hook rib is optimized so as to be able to hold the first lead.

[0066] In one or more embodiments, an impact tool includes a fan fixed to the upper portion of a motor rotor shaft, and a baffle disposed at the upper end of the motor housing and facing the fan. The baffle includes an annular base portion inserted into an opening at the upper end of a barrel portion, and a threaded boss provided on the periphery of the base portion. The protrusion includes an upper recessed portion into which the threaded boss is inserted when the base portion is inserted into the opening at the upper end of the barrel portion.

[0067] According to the above configuration, since the base portion is inserted into the opening at the upper end of the cylindrical portion and the threaded boss is inserted into the upper recess of the protruding portion, the amount of upward protrusion of the baffle from the motor housing is small, thereby suppressing the increase in size of the impact tool.

[0068] In one or more embodiments, a screw inserted into the opening of the threaded boss is engaged with a threaded hole provided in the upper recess.

[0069] According to the above configuration, the motor housing and the baffle are fixed together by screws. Since the screws are located inside the upper recess, the amount of the screws protruding upward from the baffle is small. This prevents the impact tool from becoming larger.

[0070] In one or more embodiments, the motor housing includes 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 a synthetic resin inner member disposed between an inner circumferential surface of the cylindrical portion and an outer circumferential surface of a stator core of the motor.

[0071] According to the above configuration, contact between the motor case made of magnesium alloy and the stator core made of iron is suppressed by the inner member made of synthetic resin, and thus wear of the motor case is suppressed.

[0072] In one or more embodiments, the inner member includes an annular base portion disposed between the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the motor's stator core, an outer convex portion projecting radially outward from the outer circumferential surface of the base portion, and an inner convex portion projecting radially inward from the inner circumferential surface of the base portion. The inner circumferential surface of the cylindrical portion includes an inner concave portion for receiving the outer convex portion. The outer circumferential surface of the stator core includes a groove for receiving the inner convex portion.

[0073] According to the above configuration, the inner protrusion is inserted into the inner side of the groove, thereby suppressing the relative position between the stator and the inner member from changing in the rotational direction. The outer protrusion is inserted into the inner side of the inner recess, thereby suppressing the relative position between the inner member and the motor housing from changing in the rotational direction.

[0074] In one or more embodiments, the impact tool comprises: a controller, which is arranged at a position on the rear side of the motor housing and controls the motor; and a sensor substrate, which is housed in the motor housing and detects the position of the motor's rotor in the rotational direction. The motor housing comprises: a barrel portion arranged around the motor, and a lower wall portion arranged at the lower end of the barrel portion. The stator of the motor comprises: a stator core, and a power terminal arranged at a position on the rear side of the stator core inside the motor housing. The sensor substrate is arranged at a position on the lower side of the stator core inside the motor housing. A first opening is provided at the rear of the barrel portion. A second opening is provided at the rear of the lower wall portion. A second lead connecting the power terminal to the controller passes through the first opening. A third lead connecting the sensor substrate to the controller passes through the second opening.

[0075] According to the above configuration, since the second lead passes through the first opening provided in the rear portion of the barrel, excessive bending of the second lead or excessive tension acting on the second lead is suppressed. Since the third lead passes through the second opening provided in the rear portion of the lower wall, excessive bending of the third lead or excessive tension acting on the third lead is suppressed.

[0076] In one or more embodiments, the motor case includes a reinforcing rib provided at a boundary between the first opening and the second opening and integrally formed with the cylindrical portion and the lower wall portion.

[0077] According to the above configuration, since the reinforcement rib is arranged at the boundary between the first opening and the second opening, a decrease in the strength of the motor case is suppressed.

[0078] In one or more embodiments, the impact tool includes a main body housing made of synthetic resin that houses a motor housing. The anvil rotates about an output rotation axis extending in the front-to-back direction. The total length, representing the distance in the front-to-back direction between the front end of the anvil and the rear end of the main body housing, is 440 mm or less.

[0079] According to the above-described configuration, the impact tool is prevented from becoming larger in size, and the workability of the work using the impact tool is improved.

[0080] In one or more embodiments, the main housing includes a main body portion that houses the motor housing, a handle portion positioned rearward of the main body portion, and a controller housing portion positioned below the handle portion. The handle portion includes a rear handle portion extending upward from the rear of the controller housing portion, and an upper handle portion extending forward from the upper end of the rear handle portion. The front end of the upper handle portion is connected to the upper portion of the main body portion. The spatial length, representing the maximum dimension in the front-to-back direction of the space enclosed by the handle portion, the main body portion, and the controller housing portion, is 90 mm or greater.

[0081] With this configuration, when grasping the grip, the operator can easily grasp only the rear grip, or simultaneously grasp a portion of the rear grip and a portion of the upper grip. Furthermore, when grasping the grip, the operator's fingers are less likely to interfere with the main body, making it easier to grasp. Since various grasping methods can be used depending on the working situation, operability is improved.

[0082] In one or more embodiments, the upper end portion of the motor housing and the lower end portion of the gear box are fixed by screws.

[0083] According to the above configuration, the motor housing and the gear box arranged in the vertical direction are fixed by screws.

[0084] In one or more embodiments, the motor rotor rotates about a motor rotation shaft extending in a 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 extending in a front-rear direction.

[0085] According to the above configuration, since the motor rotation axis and the output rotation axis are orthogonal to each other, the overall length of the impact tool can be shortened.

[0086] In one or more embodiments, the impact tool includes a hammer housing disposed in front of the gear housing and housing the hammer. Both the motor housing and the gear housing are made of magnesium alloy, and the hammer housing is made of aluminum.

[0087] According to the above configuration, since both the motor housing and the gear box are made of magnesium alloy, both can be made stronger and lighter. Since the hammer case is made of aluminum, which is stronger than magnesium alloy, the hammer case can withstand even a large impact when the hammer strikes the anvil.

[0088] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the embodiments. The constituent elements of the embodiments described below can be combined as appropriate. In addition, some constituent elements may not be used.

[0089] In the embodiments, the terms "front," "rear," "left," "right," "up," and "down" are used to describe the positional relationships of various components. These terms represent relative positions or directions relative to the center of the impact tool 1. The left-right, front-back, and up-down directions are orthogonal.

[0090] The impact tool 1 includes a motor 10 and an anvil 16 serving as the output portion of the impact tool 1. The rotation axis of the motor 10 is referred to as the motor rotation axis MX, and the rotation axis of the anvil 16 is referred to as the output rotation axis AX. The motor rotation axis MX extends in the vertical direction. The output rotation axis AX extends in the front-back direction. The motor rotation axis MX and the output rotation axis AX are orthogonal to each other.

[0091] The direction parallel to the output rotation axis AX will be referred to as the axial direction, the direction around the output rotation axis AX will be referred to as the circumferential direction or the rotational direction, and the direction radiating from the output rotation axis AX will be referred to as the radial direction. Furthermore, in the radial direction, a position closer to the output rotation axis AX or a direction close to the output rotation axis AX will be referred to as the radially inner side, and a position farther from the output rotation axis AX or a direction farther from the output rotation axis AX will be referred to as the radially outer side.

[0092] [Impact tools]

[0093] Figure 1 It is a perspective view showing the impact tool 1 according to the embodiment as viewed from the left front side. Figure 2 It is a perspective view showing the impact tool 1 according to the embodiment as viewed from the right rear side. Figure 3 This is a diagram showing the impact tool 1 according to the embodiment as viewed from the right side. Figure 4 This is a diagram showing the impact tool 1 according to the embodiment as viewed from the left side. Figure 5 This is a diagram of the impact tool 1 according to the embodiment as viewed from the rear side. Figure 6 This is a diagram of the impact tool 1 according to the embodiment as viewed from the front. Figure 7 This is a diagram showing the impact tool 1 according to the embodiment as viewed from above. Figure 8 This is a diagram showing the impact tool 1 according to the embodiment as viewed from below.

[0094] Figure 9 is a cross-sectional view showing an impact tool 1 according to an embodiment, and Figure 7 The BB line cross-section view is equivalent to the BB line cross-section view. Figure 10 is a cross-sectional view showing an impact tool 1 according to an embodiment, and Figure 3 The A-A line cross-sectional view is equivalent. Figure 11 is a cross-sectional view showing a portion of the impact tool according to the embodiment, Figure 9 The image is equivalent to the enlarged part of the picture. Figure 12 is a cross-sectional view showing a portion of the impact tool 1 according to the embodiment, Figure 9 The image is equivalent to the enlarged part of the picture. Figure 13 is a cross-sectional view showing a portion of the impact tool 1 according to the embodiment, Figure 12 The image is equivalent to the enlarged part of the picture.

[0095] An impact tool 1 is a type of power tool that uses an electric motor 10 as its driving source. In the embodiment, the impact tool 1 is an impact wrench, a type of fastening tool. The impact tool 1 includes a main body housing 2, a battery housing 3, a motor housing 4, a gear box 5, a hammer housing 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 speed reduction mechanism 13, a spindle 14, a striking mechanism 15, an anvil 16, a trigger switch 17, a forward / reverse switching lever 29, a light assembly 18, an interface panel 19, and a hook assembly 20.

[0096] The main body housing 2 houses the motor housing 4 . The main body housing 2 houses a portion of the gear box 5 . The main body housing 2 is connected to the battery housing 3 . The main body housing 2 is fixed to the hammer housing 6 .

[0097] The main body housing 2 is made of synthetic resin. Nylon resin is an example of the synthetic resin forming the main body housing 2. 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 positioned to the right of the left main body housing 2L. The left and right main body housings 2L and 2R form a pair of split housing halves. The left and right main body housings 2L and 2R are secured together by a plurality of screws 2S.

[0098] The main body housing 2 includes a main body portion 21 , a protruding portion 22 , a grip portion 23 , a controller housing portion 24 , and a panel holding portion 25 .

[0099] The main body 21 houses the motor case 4 and a portion of the gear box 5 .

[0100] The protrusion 22 protrudes downward from the main body 21 . The protrusion 22 is disposed at a front side of the battery case 3 .

[0101] The grip 23 is grasped by the operator. The grip 23 is arranged at a position on the rear side of the main body 21. The grip 23 includes: a rear grip 23A extending from the rear of the controller housing 24 toward the upper side, and an upper grip 23B extending from the upper end of the rear grip 23A toward the front side. The lower end of the rear grip 23A is connected to the controller housing 24. The upper end of the rear grip 23A is connected to the rear end of the upper grip 23B. The front end of the upper grip 23B is connected to the upper part of the main body 21. A D-shaped handle is formed by the grip 23, the main body 21 and the controller housing 24. The D-shaped handle is arranged at a position on the rear side of the motor 10. The trigger switch 17 is arranged at the upper part of the rear grip 23A.

[0102] 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 behind the main body portion 21 and the panel holding portion 25 .

[0103] The panel holding portion 25 holds the interface panel 19 . The panel holding portion 25 is arranged so as to extend from the front portion of the controller housing portion 24 toward the front side and upward. The panel holding portion 25 is arranged at a position on the rear side of the main body portion 21 .

[0104] The battery case 3 supports the battery holder 9. The battery case 3 is connected to the main body case 2 so as to be movable relative to the main body case 2. The battery case 3 is made of synthetic resin. As an example of the synthetic resin forming the battery case 3, nylon resin is exemplified.

[0105] The battery case 3 is disposed below the controller housing portion 24. The battery case 3 is disposed behind the protruding portion 22. The battery case 3 is connected to the D-shaped handle.

[0106] The battery case 3 includes a left battery case 3L and a right battery case 3R. The right battery case 3R is positioned to the right of the left battery case 3L. The left and right battery cases 3L and 3R form a pair of split cases. The left and right battery cases 3L and 3R are secured together using a plurality of screws 3S. The battery holder 9 is sandwiched between the left and right battery cases 3L and 3R.

[0107] The motor case 4 houses the motor 10 and is disposed below the gear case 5. The motor case 4 is fixed to the gear case 5.

[0108] The motor case 4 is made of a magnesium alloy. An example of the magnesium alloy forming the motor case 4 is MDC1D, which is a Mg-Al-Zn magnesium alloy. The motor case 4 is manufactured by die casting.

[0109] The motor housing 4 includes a cylindrical portion 4A disposed around the motor 10 and a lower wall portion 4B disposed at a lower end portion of the cylindrical portion 4A.

[0110] The gear box 5 houses at least a portion of the speed reduction mechanism 13. The gear box 5 is disposed at a rear side of the hammer case 6. The hammer case 6 is disposed at a front side of the gear box 5. The gear box 5 is fixed to the hammer case 6.

[0111] The gear box 5 is made of a magnesium alloy. An example of the magnesium alloy forming the gear box 5 is MDC1D, which is a Mg-Al-Zn magnesium alloy. The gear box 5 is manufactured by die casting.

[0112] The gear box 5 is substantially cylindrical. An opening is provided at the front of the gear box 5. An opening is provided at the rear of the gear box 5. An opening is provided at the bottom of the gear box 5. A bearing cover 40 is provided at the opening at the rear of the gear box 5. Figure 11 as well as Figure 29 As shown in FIG. 1 , the bearing cover 40 is fixed to the rear of the gear box 5 by screws 40S. Figure 29 As shown, a threaded boss 40A is provided on the periphery of the bearing cap 40. A screw 40S is inserted into an opening provided in the threaded boss 40A. The screw 40S is inserted into a threaded hole 5C provided in the rear end of the gear case 5. After being inserted from the rear side of the threaded boss 40A into the opening 40B of the threaded boss 40A, the screw 40S is further inserted into the threaded hole 5C of the gear case 5.

[0113] The hammer case 6 houses the striking mechanism 15 including the hammer 71 . The hammer case 6 is connected to the front portion of the main body housing 2 . The hammer case 6 is connected to the front portion of the gear case 5 .

[0114] The hammer housing 6 is made of aluminum.

[0115] The hammer housing 6 is substantially cylindrical. Figure 12 as well as Figure 13 As shown, the hammer housing 6 includes: 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 arranged around the striking mechanism 15 including the hammer 71. The second cylindrical portion 62 is arranged at a position closer to the front side than 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 portion of the gear box 5 is inserted into: an opening provided at the rear end portion of the first cylindrical portion 61. The front wall portion 63 connects the front end portion of the first cylindrical portion 61 and the rear end portion of the second cylindrical portion 62. The annular rib portion 64 protrudes toward the front side from the outer edge portion of the front surface of the front wall portion 63. The annular rib portion 64 is substantially annular in shape within a plane perpendicular to the output rotation axis AX.

[0116] like Figure 2 、 Figure 5 、 Figure 21 ,as well as Figure 22 As shown in the figures, the main housing 2, gear box 5, and hammer case 6 are fixed together by a plurality of screws 41. The main housing 2 has a plurality of threaded bosses 2B. The gear box 5 has a plurality of threaded bosses 5B. The hammer case 6 has a plurality of threaded bosses 6B. The screws 41 are inserted into the openings provided in the threaded bosses 2B of the main housing 2 and the openings provided in the threaded bosses 5B of the gear box 5. The screws 41 are inserted into the threaded holes provided in the threaded bosses 6B of the hammer case 6. After being inserted from the rear side of the threaded bosses 2B into the openings of the threaded bosses 2B and 5B, the screws 41 are then inserted into the threaded holes of the threaded bosses 6B.

[0117] An opening is provided at the top of the motor housing 4. An opening is provided at the bottom of the gear box 5. The internal space of the motor housing 4 and the internal space of the gear box 5 are connected via the opening at the top of the motor housing 4 and the opening at the bottom of the gear box 5. Figure 21 as well as Figure 22 As shown, the motor housing 4 and the gear box 5 are fixed by a plurality of screws 5S.

[0118] An opening is provided at the front of the gear box 5. An opening is provided at the rear of the hammer case 6. The interior space of the gear box 5 and the interior space of the hammer case 6 are connected via the opening at the front of the gear box and the opening at the rear of the hammer case 6.

[0119] The side handle 7 is grasped by the operator. It includes a handle portion 7A, which is gripped by the operator, and a base portion 7B, which is fixed to the hammer case 6. The handle portion 7A is located on the left side of the hammer case 6. The base portion 7B surrounds the first cylindrical portion 61 of the hammer case 6. The base portion 7B is substantially annular (arc-shaped). The left end of the base portion 7B is notched.

[0120] The left end of the base 7B is connected to the handle 7A via a fastening mechanism 42. The fastening mechanism 42 includes a screw 42A, which is disposed in a threaded hole provided in the left end of the base 7B, and a dial 42B, which is rotatable relative to the screw 42A. The operator can operate the dial 42B to rotate the screw 42A. Rotating the dial 42B secures the hammer case 6 to the base 7B, and secures the side handle 7 to the hammer case 6.

[0121] In the embodiment, the handle portion 7A is disposed on the left side of the hammer case 6. However, the handle portion 7A may be disposed at any position around the hammer case 6. For example, the handle portion 7A may be disposed on the left side 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 is adjustable 360 ​​degrees.

[0122] The rear side buffer 8 is configured to cover at least a portion of the surface of the hammer housing 6. Figure 12 as well as Figure 13 As shown, the rear bumper 8 is arranged to cover the outer circumferential surface of the first cylindrical portion 61, the outer circumferential surface of the annular rib 64, and the front end surface of the annular rib 64. The rear bumper 8 protects the hammer case 6. The rear bumper 8 prevents the hammer case 6 from contacting objects around the impact tool 1. The rear bumper 8 is made of rubber.

[0123] The front side buffer 120 is configured to cover at least a portion of the surface of the hammer case 6. Figure 12 as well as Figure 13 As shown, the front side bumper 120 is arranged to cover the outer peripheral surface of the second cylindrical portion 62. The front side bumper 120 protects the hammer case 6. The front side bumper 120 can prevent the hammer case 6 from contacting objects around the impact tool 1. The front side bumper 120 is made of rubber.

[0124] like Figure 13As shown, the front side buffer 120 includes a cylindrical portion 121 that covers the outer circumference of the second cylindrical portion 62, and a recessed portion 122 that is recessed radially outward from the inner circumference of the cylindrical portion 121. The cylindrical portion 121 is configured to surround the second cylindrical portion 62. The recessed portion 122 is provided with a convex portion 62A provided on the outer circumference of the second cylindrical portion 62. The front side buffer 120 is fixed to the second cylindrical portion 62 by the elastic force (fastening force) of the rubber. Furthermore, the front side buffer 120 is positioned in the second cylindrical portion 62 by inserting the convex portion 62A into the recessed portion 122.

[0125] The battery holder 9 holds the battery pack 43. The battery pack 43 is detachable relative to the battery holder 9. The controller housing 24 is arranged at a position above the battery pack 43 mounted on the battery holder 9. The protrusion 22 is arranged at a position in front of the battery pack 43 mounted on 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 an embodiment, the battery pack 43 includes a rechargeable lithium-ion battery. By being mounted on 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.

[0126] The battery holder 9 holds a plate-shaped connector 44. The connector 44 comprises a synthetic resin plate and metal connector terminals disposed on the plate. When the battery pack 43 is mounted on the battery holder 9, the battery terminals, which serve as the connecting terminals of the battery pack 43, are connected to the connector terminals of the connector 44.

[0127] The battery case 3 holds the spring 45 and the buffer rubber 46. The spring 45 is arranged in front of the battery holder 9. The buffer rubber 46 is arranged in front of the battery pack 43 held by the battery holder 9. The spring 45 applies force to the battery holder 9 toward the rear. The buffer rubber 46 is arranged in front of the battery pack 43 mounted on the battery holder 9. The buffer rubber 46 is arranged further forward than the battery pack 43 mounted on the battery holder 9. The buffer rubber 46 can come into contact with the front of the battery pack 43. For example, if the impact tool 1 falls, the elastic force of the spring 45 can mitigate the impact on the connecting body 44, and the buffer rubber 46 can mitigate the impact on the battery pack 43.

[0128] The motor 10 functions as a power source for the impact tool 1. The motor 10 is an inner rotor type DC brushless motor. Figure 11As shown, the motor 10 includes a stator 47, a rotor 48, and a rotor shaft 49. The stator 47 is supported by the motor housing 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 about the motor rotation axis MX extending in the vertical direction.

[0129] like Figure 11 As shown, stator 47 includes a stator core 47A, an insulator 47B fixed to stator core 47A, and a plurality of coils 47C wound around each of the plurality of teeth of stator core 47A via insulator 47B. Coils 47C are connected via busbar unit 47D. Busbar unit 47D is fixed to the bottom of insulator 47B with screws 47E.

[0130] like Figure 11 、 Figure 24 、 Figure 26 、 Figure 27 ,as well as Figure 28 As shown in FIG. 1 and FIG. 2 , in the embodiment, the 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 housing 4. The inner member 80 is substantially annular and made of glass fiber reinforced polycarbonate resin.

[0131] The rotor 48 rotates around the motor rotation axis MX. Figure 11 As shown, the rotor 48 includes a rotor core 48A and a rotor magnet 48B fixed to the rotor core 48A. In the embodiment, the rotor magnet 48B is arranged inside the rotor core 48A. Alternatively, the rotor magnet 48B may be arranged on the outer peripheral surface of the rotor core 48A.

[0132] like Figure 11 As shown, the sensor substrate 50 is fixed to the busbar unit 47D of the stator 47. The sensor substrate 50 is housed in the motor housing 4. The sensor substrate 50 is fixed to the busbar unit 47D with screws 50S. The sensor substrate 50 detects the position of the rotor 48 in the rotational direction. The sensor substrate 50 includes an annular circuit substrate 50A and a magnetic sensor 50B supported by the circuit substrate 50A. The magnetic sensor 50B is a Hall effect IC. The magnetic sensor 50B detects the position of the rotor magnet 48B of the rotor 48, thereby detecting the position of the rotor 48 in the rotational direction.

[0133] The rotor shaft 49 is fixed to the rotor core 48A of the rotor 48. The rotor 48 and the rotor shaft 49 rotate together about the motor rotation axis MX.

[0134] like Figure 11As shown, the rotor shaft 49 is rotatably supported by a rotor bearing 51 and a rotor bearing 52. The rotor bearing 51 rotatably supports the upper portion of the rotor shaft 49, which protrudes upward from the upper end surface of the rotor 48. The rotor bearing 52 rotatably supports the lower portion of the rotor shaft 49, which protrudes downward from the lower end surface of the rotor 48. The rotor bearing 51 is retained by the gearbox 5. The rotor bearing 52 is retained by the motor housing 4.

[0135] like Figure 11 As shown, the 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 portion of the speed reduction mechanism 13. The first bevel gear 53 rotates around the motor rotation axis MX. The rotor shaft 49 is connected to the speed reduction mechanism 13 via the first bevel gear 53.

[0136] The controller 11 outputs a control signal for controlling the motor 10. Figure 9 As shown, 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), nonvolatile memory such as ROM (Read Only Memory) or a saver, volatile memory such as RAM (Random Access Memory), field effect transistors (FETs), capacitors, and resistors.

[0137] like Figure 9 As shown, the controller 11 is housed in the controller housing portion 24. The controller 11 is held in the controller housing portion 24 by the controller case 11A.

[0138] like Figure 9 、 Figure 11 、 Figure 21 、 Figure 22 ,as well as Figure 23 As shown in FIG. 1 and FIG. 2 , a baffle plate 30 is disposed at the upper end of the motor housing 4. The baffle plate 30 is annular and is fixed to the motor housing 4 by screws 30S.

[0139] The fan 12 generates an air flow for cooling the motor 10 and the controller 11. Figure 9 as well as Figure 11 As shown, the fan 12 is arranged above the stator 47. The fan 12 is fixed to the upper portion of the rotor shaft 49. The fan 12 is arranged between the rotor bearing 51 and the baffle 30. The fan 12 faces the baffle 30. The fan 12 rotates together with the rotor shaft 49.

[0140] like Figure 3 as well as Figure 4 As shown in FIG. 1 , an air inlet 26 is provided in the controller housing 24. An air outlet 27 is provided in the main body 21. Figure 11 As shown in FIG. 1 , an opening 4C is provided at the rear portion of the motor housing 4. As the fan 12 rotates, the air in the external space of the main housing 2 flows into the internal space of the controller housing 24 through the air inlet 26. The air flowing into the internal space of the controller housing 24 circulates in the internal space of the controller housing 24, thereby cooling the controller 11. The air circulating in the internal space of the controller housing 24 flows into the internal space of the motor housing 4 through the opening 4C due to the rotation of the fan 12. The air flowing into the internal space of the motor housing 4 circulates in the internal space of the motor housing 4, thereby cooling the motor 10. At least a portion of the air circulating in the internal space of the motor housing 4 flows out to the external space of the motor housing 4 through the exhaust port 27 due to the rotation of the fan 12.

[0141] The speed reduction mechanism 13 is rotated by the motor 10. The speed reduction mechanism 13 transmits the rotational force of the motor 10 to the striking mechanism 15 via the main shaft 14. The speed reduction mechanism 13 connects the rotor shaft 49 and the main shaft 14. The speed reduction mechanism 13 rotates the main shaft 14 at a speed lower than the rotation speed of the rotor shaft 49.

[0142] like Figure 11 As shown, the speed reduction mechanism 13 includes a first bevel gear 53, a second bevel gear 54 meshing with the first bevel gear 53, and a planetary gear mechanism 55 driven by the rotational force of the motor 10 transmitted via the second bevel gear 54. The first bevel gear 53 rotates around the motor rotation axis MX. The second bevel gear 54 rotates around the output rotation axis AX.

[0143] The planetary gear mechanism 55 is housed in the gear box 5. Figure 11 As shown, the planetary gear mechanism 55 includes a sun gear 55S, planetary gears 55P, and an internal gear 55I. Multiple planetary gears 55P are provided. The multiple planetary gears 55P are arranged around the sun gear 55S. The internal gear 55I is arranged around the multiple planetary gears 55P. The internal gear 55I is fixed to the inner circumferential surface of the gear case 5.

[0144] The second bevel gear 54 is arranged 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 can rotate around the output rotation axis AX extending in the front-to-back direction. The output rotation axis AX is orthogonal to the motor rotation axis MX. The rear end of the sun gear 55S is supported by a gear bearing 56. The middle part of the sun gear 55S is supported by a gear bearing 57. The gear bearing 56 is retained by the bearing cover 40. The gear bearing 57 is retained by the gear box 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.

[0145] Multiple planetary gears 55P mesh with the sun gear 55S, respectively. Planetary gears 55P are rotatably supported on the rear portion of the main shaft 14 via pins 55A. The main shaft 14 rotates via the planetary gears 55P. Internal gear 55I has internal teeth that mesh with the planetary gears 55P. Internal gear 55I is fixed to the gearbox 5. Multiple protrusions are provided on the outer circumference of internal gear 55I. The protrusions of internal gear 55I fit into recesses provided on the inner circumference of the gearbox 5. Internal gear 55I cannot always rotate relative to the gearbox 5.

[0146] When the motor 10 drives the rotor shaft 49 and the first bevel gear 53, the second bevel gear 54 and the sun gear 55S rotate. As the sun gear 55S rotates, the planetary gears 55P orbit around it. Planetary gears 55P orbit while meshing with the internal teeth of the internal gear 55I. The orbital rotation of the planetary gears 55P causes the main shaft 14, connected to the planetary gears 55P via the pin 55A, to rotate at a speed lower than that of the rotor shaft 49.

[0147] The spindle 14 is rotated by the rotational force of the motor 10 transmitted via the speed reduction mechanism 13. The spindle 14 transmits the rotational force of the motor 10 transmitted via the speed reduction mechanism 13 to the striking mechanism 15. The spindle 14 is rotatable about the output rotation axis AX. The rear portion of the spindle 14 is housed in the gear box 5. The front portion of the spindle 14 is housed in the hammer housing 6. At least a portion of the spindle 14 is positioned forward of the speed reduction mechanism 13. The spindle 14 is positioned rearward of the anvil 16.

[0148] like Figure 12 As shown, the spindle 14 includes a flange portion 14A, a spindle shaft portion 14B, and a protruding portion 14C. The spindle shaft portion 14B protrudes forward from the flange portion 14A. The protruding portion 14C protrudes rearward from the flange portion 14A.

[0149] like Figure 11 As shown, planetary gear 55P is rotatably supported by protrusion 14C via pin 55A. Main shaft 14 is rotatably supported by main shaft bearing 58. Main shaft bearing 58 rotatably supports protrusion 14C. Main shaft bearing 58 is held by gear case 5.

[0150] The striking mechanism 15 strikes the anvil 16 in a rotational direction centered on the output rotation axis AX. The striking mechanism 15 is located in front of the motor 10. The striking mechanism 15 is driven by the motor 10. The striking mechanism 15 is rotatable about 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 main shaft 14. The striking mechanism 15 strikes the anvil 16 in the rotational direction based on the rotational force of the main shaft 14 rotated by the motor 10.

[0151] The striking mechanism 15 is housed in the first cylindrical portion 61 of the hammer housing 6. Figure 12 As shown, the striking mechanism 15 includes 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 .

[0152] The hammer 71 is arranged in front of the speed reduction mechanism 13. The hammer 71 is arranged around the main shaft portion 14B. The hammer 71 is held by the main 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 through the speed reduction mechanism 13. The ball 72 is arranged between the main shaft portion 14B and the hammer 71. The hammer 71 has a cylindrical hammer body 71A and a hammer protrusion 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 from the rear surface of the hammer body 71A toward the front side.

[0153] The hammer 71 is rotated by the motor 10. The rotational force of the motor 10 is transmitted to the hammer 71 via the speed reduction mechanism 13 and the main shaft 14. The hammer 71 can rotate together with the main shaft 14 based on the rotational force of the main shaft 14 rotated by the motor 10. The hammer 71 and the main shaft 14 each rotate around the output rotation axis AX.

[0154] The first washer 76 is arranged inside the recess 71C. The first washer 76 is supported by the hammer 71 via a plurality of balls 78. The balls 78 are arranged in front of the first washer 76.

[0155] The second washer 77 is arranged inside the recess 71C and at a position behind the first washer 76. The outer diameter of the second washer 77 is smaller than that of the first washer 76. The second washer 77 and the hammer 71 are relatively movable in the front-rear direction.

[0156] The first coil spring 73 is disposed around the spindle shaft 14B. The rear end of the first coil spring 73 is supported by the flange 14A. The front end of the first coil spring 73 is located inside the recess 71C and supported by the first washer 76. The first coil spring 73 constantly generates a spring force that moves the hammer 71 forward.

[0157] The second coil spring 74 is disposed around the spindle shaft 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 14A. The front end of the second coil spring 74 is disposed inside the recess 71C and supported by the second washer 77. The second coil spring 74 generates a spring force that causes the hammer 71 to move forward when the hammer 71 moves rearward.

[0158] The third coil spring 75 is arranged around the spindle shaft 14B. The third coil spring 75 is arranged radially inward of the first coil spring 73. The third coil spring 75 is arranged 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 14A. As a result, the second coil spring 74 is prevented from freely moving relative to the flange 14A.

[0159] The ball 72 is made of metal such as steel. It is positioned between the main shaft portion 14B and the hammer 71. The main shaft 14 has a main shaft groove 14D in which at least a portion of the ball 72 is positioned. The main shaft groove 14D is provided on a portion of the outer surface of the main shaft portion 14B. The hammer 71 has a hammer groove 71D in which at least a portion of the ball 72 is positioned. The hammer groove 71D is provided on a portion of the inner surface of the hammer 71. The ball 72 is positioned between the main shaft groove 14D and the hammer groove 71D. The ball 72 can roll inside the main shaft groove 14D and inside the hammer groove 71D, respectively. The hammer 71 is movable along with the ball 72. The main shaft 14 and the hammer 71 are capable of relative movement within the movable ranges defined by the main shaft groove 14D and the hammer groove 71D, both in a direction parallel to the output rotation axis AX and in a rotational direction centered on the output rotation axis AX.

[0160] The anvil 16 is an output portion 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 positioned in front of the hammer 71. The anvil 16 is struck in the rotational direction by the hammer 71 of the striking mechanism 15.

[0161] like Figure 12 As shown, 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 from the rear end toward the front of the anvil 16. The spindle 14 is arranged behind the anvil 16. The front end of the spindle shaft portion 14B is arranged in the anvil recess 16A.

[0162] The anvil 16 includes an anvil shaft 16B and an anvil projection 16C. The anvil shaft 16B is positioned in front of the striking mechanism 15. The anvil projection 16C projects radially outward from the rear end of the anvil shaft 16B. The anvil projection 16C is struck by the striking mechanism 15 in a rotational direction centered on the output rotation axis AX.

[0163] The front end of the anvil shaft portion 16B is arranged at a position on the front side of the hammer case 6 via the front opening of the second cylindrical portion 62. A socket is mounted on the front end of the anvil shaft portion 16B as a tip tool.

[0164] The anvil 16 is rotatably supported by an anvil bearing 79. The anvil bearing 79 is disposed around the anvil shaft 16B. The anvil 16 is rotatable about the output rotation axis AX. The anvil bearing 79 is retained by the hammer case 6. The anvil bearing 79 is disposed inside the second cylindrical portion 62 of the hammer case 6. The anvil bearing 79 is retained by the second cylindrical portion 62 of the hammer case 6.

[0165] 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. Alternatively, for example, a sliding bearing can be formed by impregnating a cylindrical porous metal body manufactured by powder metallurgy with lubricating oil.

[0166] The outer peripheral surface of a portion of the anvil shaft portion 16B supported by the anvil bearing 79 is circular in a cross section perpendicular to the output rotation axis AX. The inner peripheral surface of the anvil bearing 79 is circular in a cross section perpendicular to the output rotation axis AX.

[0167] The front end of the anvil shaft portion 16B is arranged at a position further forward than the second tube portion 62 via the opening of the front end of the second tube portion 62. At least a portion of the anvil shaft portion 16B is arranged at a position inside the opening of the front end of the second tube portion 62. Figure 12 as well as Figure 13As shown, a sealing member 94 is provided at the front end of the anvil bearing 79. The sealing member 94 is arranged at a position 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 sealing member 94 is arranged at a position inside the recess 79A. The sealing member 94 seals the boundary between the front end of the anvil bearing 79 and the anvil shaft portion 16B.

[0168] The trigger switch 17 is operated by the operator to drive the motor 10. The so-called driving of 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 23A. Figure 9 As shown, the trigger switch 17 includes a trigger paddle 17A and a switch body 17B. The switch body 17B is disposed within the interior space of the rear grip 23A. The trigger paddle 17A protrudes forward from the upper portion of the front portion of the rear grip 23A. The trigger paddle 17A is operated by the operator to move it rearward. By operating the trigger paddle 17A to move it rearward, the motor 10 is driven. By releasing the trigger paddle 17A, the motor 10 is stopped.

[0169] The forward / reverse switching lever 29 is operated by the operator to switch the rotational direction of the motor 10. It is located on the upper grip 23B. It is supported on the upper grip 23B so that it can slide in the front-to-back direction. Sliding the forward / reverse switching lever 29 forward rotates the motor 10 in the forward direction. Sliding the forward / reverse switching lever 29 backward rotates the motor 10 in the reverse direction.

[0170] The lamp assembly 18 emits illuminating light. The lamp assembly 18 illuminates the anvil 16 and its surroundings with the illuminating light. The lamp assembly 18 also illuminates the front of the anvil 16 with the illuminating light. Furthermore, the lamp assembly 18 illuminates the socket mounted on the anvil 16 and its surroundings with the illuminating light. The lamp assembly 18 is disposed around the second cylindrical portion 62 of the hammer case 6.

[0171] The interface panel 19 includes, for example, operation buttons for selecting a lighting mode of the lamp unit 18. The interface panel 19 includes, for example, a display unit for displaying the remaining capacity of the battery pack 43.

[0172] The hook assembly 20 is hooked onto an object. The hook assembly 20 includes a base portion 20A and a ring portion 20B. The base portion 20A is fixed to the upper portion of the main housing 2. In the embodiment, the base portion 20A includes an opening for inserting a screw 41. The screw 41 is inserted into the opening of the threaded boss 2B through the opening of the base portion 20A. The base portion 20A is fixed to the upper portion of the main housing 2 by being clamped between the head of the screw 41 and the threaded boss 2B. The ring portion 20B is configured to protrude upward from the base portion 20A. By inserting at least a portion of the object into the base portion 20A, the impact tool 1 is suspended from the object by means of the hook assembly 20.

[0173] [Light unit]

[0174] Figure 14 1 is an exploded perspective view of the lamp assembly 18 according to the embodiment as viewed from the right front side. Figure 13 as well as Figure 14 As shown, the lamp assembly 18 includes a light-emitting unit 90 , an axial elastic body 91 , and a radial elastic body 92 .

[0175] The light emitting unit 90 is arranged around the second cylindrical portion 62. The light emitting unit 90 includes a chip on board light emitting diode 95 (COB LED) and an optical component 96. The COB LED 95 includes a substrate 95A, an LED chip 95B as a light emitting element, and a phosphor 95C.

[0176] At least a portion of the optical component 96 is positioned further forward than the chip-on-board light-emitting diode 95. At least a portion of the optical component 96 is positioned 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 component 96 and is irradiated onto the front side of the light-emitting unit 90.

[0177] The optical component 96 is made of polycarbonate resin. In the embodiment, the optical component 96 is made of polycarbonate resin containing a white diffusion material. The optical component 96 has a milky white color. The light transmittance of the optical component 96 is 40% to 70%. The milky white color of the optical component 96 makes it difficult to visually observe the outer shape of the LED chip 95B from the outside of the impact tool 1. This makes the outer shape of the LED chip 95B difficult to visually observe, thereby improving the appearance of the impact tool 1.

[0178] 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 can each suppress the transmission of vibration 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-isolating member that dampens vibration input to the light-emitting unit 90.

[0179] The radial elastic body 92 is annular and is disposed so as to surround the anvil shaft portion 16B and the second cylindrical portion 62 .

[0180] The radial elastic body 92 is supported by the hammer case 6. The radial elastic body 92 supports the light-emitting unit 90 from the radially inner side. At least a portion of the radial elastic body 92 faces the front surface of the optical component 96. The radial elastic body 92 includes a radial base portion 92A, a rear support portion 92B, and a front support portion 92C. The radial base portion 92A, rear support portion 92B, and front support portion 92C are integral.

[0181] The radial base portion 92A is radially arranged 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 arranged around the second cylindrical portion 62. The inner circumferential surface of the radial base portion 92A opposes the outer circumferential surface of the second cylindrical portion 62. The inner circumferential surface of the radial base portion 92A contacts the outer circumferential surface of the second cylindrical portion 62. The outer circumferential surface of the radial base portion 92A opposes the inner circumferential surface of the light-emitting unit 90. The outer circumferential surface of the radial base portion 92A contacts the inner circumferential surface of the light-emitting unit 90.

[0182] The rear support portion 92B supports the light-emitting unit 90 from the rear. The rear support portion 92B is annular. It is connected to the rear end of the radial base portion 92A. The rear support portion 92B protrudes radially outward from the rear end 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-emitting unit 90.

[0183] The front support portion 92C supports the light-emitting unit 90 from the front. The front support portion 92C is annular. It is connected to the front end of the radial base portion 92A. The front support portion 92C protrudes radially outward from the front end of the radial base portion 92A. The rear surface of the front support portion 92C contacts the front surface of the light-emitting unit 90. The front surface of the front support portion 92C contacts the rear surface of the front bumper 120.

[0184] The axial elastic body 91 is annular and is arranged to surround the light-emitting unit 90 .

[0185] The axial elastic body 91 is supported by the light-emitting unit 90. The axial elastic body 91 supports the light-emitting unit 90 from the rear. In the radial direction, at least a portion of the axial elastic body 91 is positioned between the annular rib 64 and the light-emitting unit 90. The axial elastic body 91 includes an axial base portion 91A, a rear support portion 91B, and a front support portion 91C. The axial base portion 91A, rear support portion 91B, and front support portion 91C are integral.

[0186] The axial base portion 91A is radially disposed between the annular rib 64 and the light-emitting unit 90. The axial base portion 91A is cylindrical in shape. The axial base portion 91A is disposed around the light-emitting unit 90. The outer circumferential surface of the axial base portion 91A faces the inner circumferential surface of the annular rib 64. The outer circumferential surface of the axial base portion 91A contacts the inner circumferential surface of the annular rib 64. The inner circumferential surface of the axial base portion 91A faces the outer circumferential surface of the light-emitting unit 90. The inner circumferential surface of the axial base portion 91A contacts the outer circumferential surface of the light-emitting unit 90.

[0187] The rear support portion 91B supports the light-emitting unit 90 from the rear. The rear support portion 91B is annular. It is connected to the rear end of the axial base portion 91A. The rear support portion 91B protrudes radially inward from the rear end 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-emitting unit 90.

[0188] The front support portion 91C supports the light-emitting unit 90 from the front. The front support portion 91C is annular and connected to the front end of the axial base portion 91A. The front support portion 91C protrudes radially inward from the front end of the axial base portion 91A. The rear surface of the front support portion 91C contacts the front surface of the light-emitting unit 90.

[0189] The front bumper 120 is positioned to cover at least a portion of the surface of the hammer case 6, closer to the front of the lamp assembly 18. The front bumper 120 contacts at least a portion of the front surface of the lamp assembly 18. The front bumper 120 supports the lamp assembly 18 from the front. The front bumper 120 supports the radial elastic body 92 from the front. The front bumper 120 contacts at least a portion of the front surface of the radial elastic body 92.

[0190] The front side shock absorber 120 supports the front side support portion 92C from the front side. The rear surface of the front side shock absorber 120 contacts the front surface of the front side support portion 92C.

[0191] The front bumper 120 supports the light-emitting unit 90 from the front via the radial elastic body 92. The front bumper 120 also supports the optical component 96 from the front via the radial elastic body 92. The outer end of the front bumper 120 is positioned radially outward from the inner end of the optical component 96. The outer end of the front bumper 120 radially overlaps the inner end of the optical component 96.

[0192] In the embodiment, the rubber hardness of the rear side buffer 8 is the same as the rubber hardness of the front side buffer 120. The rubber hardness of the radial elastic body 92 is the same as the rubber hardness of the axial elastic body 91. The rubber hardness of the front side buffer 120 and the rear side buffer 8 is higher than the rubber hardness of the radial elastic body 92 and the axial elastic body 91.

[0193] The washer 93 supports the front side support portion 92C from the front side. The front surface of the front side support portion 92C contacts the rear surface of the washer 93. Figure 13 As shown, the washer 93 is arranged in the washer groove 62B provided on the outer peripheral surface of the second cylindrical portion 62. The washer 93 functions as a stopper that supports the front support portion 92C from the front side.

[0194] [Shock absorbing mechanism]

[0195] Figure 15 is a cross-sectional view showing a portion of the impact tool 1 according to the embodiment, Figure 9 The image is equivalent to the enlarged part of the picture. Figure 16 is a cross-sectional view showing a portion of the impact tool 1 according to the embodiment, and Figure 3 The C-C line cross-sectional view is equivalent. Figure 17 It is an exploded perspective view showing the battery case 3 and the battery holder 9 according to the embodiment as viewed from the right front side.

[0196] The impact tool 1 includes: a main body housing 2 that accommodates a motor 10, an anti-vibration rubber 100 supported by the main body housing 2, a battery housing 3 supported by the anti-vibration rubber 100, a battery holder 9 for assembling a battery pack 43, and a spring 45 and a buffer rubber 46 supported by the battery housing 3.

[0197] The battery case 3 includes a holder support portion 31 that supports the battery holder 9 , and an elastic member support portion 32 that is arranged in front of the battery pack 43 mounted on the battery holder 9 .

[0198] The battery case 3 includes a left battery case 3L and a right battery case 3R. The holder support portion 31 is separated into the left and right battery cases 3L and 3R. The battery holder 9 is sandwiched between the holder support portion 31 of the left and right battery cases 3L and 3R.

[0199] The battery holder 9 holds the connector 44. The connector 44 has a connector plate 44A and a connector terminal 44B fixed to the connector plate 44A. The connector terminal 44B protrudes downward from the lower surface of the connector plate 44A. The battery terminals of the battery pack 43 and the connector terminal 44B of the connector 44 are connected. The battery holder 9 holds the connector plate 44A. An opening 37 is provided in the upper portion of the holder support portion 31. At least a portion of the connector 44 is arranged at a position inside the opening 37. When the connector 44 and the controller 11 are connected by means of a lead wire, the lead wire can pass through the opening 37.

[0200] The battery holder 9 is movably supported by the battery case 3. In the embodiment, the battery holder 9 is movably supported by the battery case 3 in the front-rear direction. The battery holder 9 is movable relative to the battery case 3 in the front-rear direction.

[0201] The battery holder 9 includes a joint holding portion 901 , a protruding portion 902 , and a sliding portion 903 .

[0202] The joint member holding portion 901 holds the joint member plate 44A. In the embodiment, the battery holder 9 includes a left battery holder 9L and a right battery holder 9R. The right battery holder 9R is positioned to the right of the left battery holder 9L. The left and right battery holders 9L and 9R form a pair of half-split holders. The joint member 44 is sandwiched between the left and right battery holders 9L and 9R.

[0203] The protrusion 902 protrudes forward from the front end of the joint member holding portion 901. The spring 45 is a coil spring. The protrusion 902 is inserted into the inner side of the spring 45.

[0204] The battery case 3 includes a guide portion 35 that guides the sliding portion 903 provided on the battery holder 9. The sliding portion 903 is guided in the front-to-back direction by the guide portion 35 of the battery case 3. In the embodiment, the guide portion 35 includes a guide groove provided on the inner surface of the battery case 3. The sliding portion 903 can move in the front-to-back direction within the guide groove.

[0205] The sliding portions 903 are provided on the left and right sides of the joint holder 901. The guide portions 35 are provided on the left and right sides of the joint holder 901 within the holder support portion 31. The battery case 3 includes a left battery case 3L and a right battery case 3R. The guide portions 35 are provided on both the left and right battery cases 3L and 3R.

[0206] The spring 45 and the rubber buffer 46 are each supported by the elastic member support portion 32 of the battery case 3. The elastic member support portion 32 includes a spring holding portion 33 that holds the spring 45 and a rubber holding portion 34 that holds the rubber buffer 46.

[0207] The spring retaining portion 33 includes a recessed portion provided in the elastic member support portion 32. The recessed portion is recessed from the rear surface of the elastic member support portion 32 toward the front. With the front portion of the spring 45 positioned inside the recessed portion, the spring 45 is retained in the spring retaining portion 33. The protrusion 902 of the battery holder 9 is inserted into the interior of the spring 45 from the rear end. The rear end of the spring 45 is supported by the front surface of the connector retaining portion 901.

[0208] The rubber buffer 46 includes a main body 46A and a convex portion 46B that protrudes forward from the front surface of the main body 46A. Two convex portions 46B are provided at intervals in the vertical direction. The rubber retaining portion 34 includes an opening provided in the elastic member support portion 32. By arranging the convex portion 46B in the opening, the rubber buffer 46 is retained in the rubber retaining portion 34. A portion of the rubber retaining portion 34 (opening) is provided in the left battery case 3L, and a portion of the rubber retaining portion 34 (opening) is provided in the right battery case 3R. With the convex portion 46B arranged between the rubber retaining portion 34 (opening) of the left battery case 3L and the rubber retaining portion 34 (opening) of the right battery case 3R, the left battery case 3L and the right battery case 3R are fixed by the screws 3S, thereby retaining the convex portion 46B in the rubber retaining portion 34.

[0209] The spring 45 and the rubber buffer 46 can respectively suppress the relative movement between the battery case 3 and the battery pack 43 mounted on the battery holder 9. The spring 45 is a compression spring. The spring 45 urges the battery holder 9 in a direction away from the rubber buffer 46.

[0210] The battery pack 43 is mounted on the battery holder 9 by sliding relative to the battery holder 9 from the rear side toward the front side. A rubber buffer 46 is positioned in front of the battery pack 43. A spring 45 biases the battery holder 9 toward the rear. At least a portion of the battery holder 9, biased toward the rear, contacts the rear portion of the holder support portion 31 of the battery case 3, thereby positioning the battery holder 9 in the front-to-back direction.

[0211] When no external force in a direction approaching the buffer rubber 46 is applied to the battery holder 9, the battery holder 9 is positioned in its initial position by the force of the spring 45. The initial position of the battery holder 9 is a position where at least a portion of the battery holder 9, which is biased rearward, contacts the rear portion of the holder support portion 31 of the battery case 3. When the battery holder 9 is positioned in its initial position, the buffer rubber 46 is separated from the battery pack 43 mounted on the battery holder 9. When an external force in a direction approaching the buffer rubber 46 is applied to the battery holder 9, the buffer rubber 46 contacts the battery pack 43 mounted on the battery holder 9. In other words, when no external force in a direction approaching the buffer rubber 46 is applied to the battery holder 9, the spring 45 can suppress relative movement between the battery case 3 and the battery pack 43. When an external force in a direction toward the rubber buffer 46 is applied to the battery holder 9 , the rubber buffer 46 can suppress relative movement between the battery case 3 and the battery pack 43 .

[0212] The vibration-isolating rubber 100 prevents vibrations from the main body housing 2 from being transmitted to the battery housing 3. The vibration-isolating rubber 100 dampens vibrations input from the main body housing 2 to the battery housing 3. The vibration-isolating rubber 100 is positioned between the main body housing 2 and the battery housing 3. The vibration-isolating rubber 100 prevents contact between the main body housing 2 and the battery housing 3. The battery housing 3 is positioned 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-isolating rubber 100 and the battery housing 3.

[0213] The vibration-isolating rubbers 100 are disposed on the left and right sides of the battery case 3. The vibration-isolating rubbers 100 include a left vibration-isolating rubber 100L disposed between the left main body case 2L and the left battery case 3L, and a right vibration-isolating rubber 100R disposed between the right main body case 2R and the right battery case 3R.

[0214] The vibration-isolating rubber 100 is in the shape of a rod extending in three different directions. The vibration-isolating rubber 100 includes 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-back direction. In the left vibration-isolating rubber 100L, the second portion 102 extends from the front end of the first portion 101 in a direction inclined downward toward the right. In the left vibration-isolating rubber 100L, the third portion 103 extends downward from the lower end of the second portion 102. In the left vibration-isolating rubber 100L, the fourth portion 104 extends rightward from the lower end of the third portion 103. In the right vibration-isolating rubber 100R, the second portion 102 extends from the front end of the first portion 101 in a direction inclined downward toward the left. In the right vibration-isolating rubber 100R, the third portion 103 extends downward from the lower end of the second portion 102. In the right anti-vibration rubber 100R, the fourth portion 104 extends toward the left side from the lower end portion of the third portion 103 .

[0215] The vibration-isolating rubber 100 has a plurality of protrusions 106 facing the battery case 3 and a retaining groove 107 facing the main body case 2. The protrusions 106 are provided on the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104. The retaining groove 107 is formed across the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104.

[0216] The battery case 3 has a holding recess 36 in which the vibration-isolating rubber 100 is disposed. The holding recess 36 is formed to match the shape of the vibration-isolating rubber 100 so that the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104 are disposed.

[0217] Retaining recesses 36 are provided on the left and right surfaces of the left and right battery cases 3L and 3R, respectively. The left vibration-isolating rubber 100L is positioned within the retaining recess 36 provided in the left battery case 3L. The right vibration-isolating rubber 100R is positioned within the retaining recess 36 provided in the right battery case 3R. The protrusions 106 contact the inner surfaces of the retaining recesses 36. The protrusions 106 reduce the contact area between the vibration-isolating rubber 100 and the battery case 3.

[0218] The main body housing 2 includes a retaining protrusion 28 that is inserted into the retaining groove 107 of the vibration-isolating rubber 100. The retaining protrusion 28 is formed to match the shape of the vibration-isolating rubber 100 so as to be inserted into the retaining groove 107 of each of the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104.

[0219] Retaining protrusions 28 are provided on the inner surfaces of the left and right main body housings 2L and 2R, respectively. In the left main body housing 2L, the retaining protrusions 28 protrude rightward from the inner surface (right surface) of the left main body housing 2L. In the right main body housing 2R, the retaining protrusions 28 protrude leftward from the inner surface (left surface) 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-isolating rubber 100L. The retaining protrusions 28 of the right main body housing 2R are inserted into the retaining grooves 107 of the right vibration-isolating rubber 100R.

[0220] In the embodiment, the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104 extending in different directions are integrated. Alternatively, the first portion 101, the second portion 102, the third portion 103, and the fourth portion 104 may be separate bodies.

[0221] [Retaining member mechanism]

[0222] Figure 18 This is a diagram showing a portion of the impact tool 1 according to the embodiment as viewed from the right side, and corresponds to a diagram in which the right main body housing 2R is removed from the impact tool 1 . Figure 19 This is a perspective view showing a portion of the impact tool 1 according to the embodiment as viewed from the right front side. Figure 18 The image is equivalent to the enlarged part of the picture. Figure 20 This is a perspective view showing a portion of the impact tool 1 according to the embodiment as viewed from the lower right rear side. Figure 18 The image is equivalent to the enlarged part of the picture.

[0223] The motor housing 4 has a holder mechanism 4H for holding the lead wires 39. Figure 19 An example of the lead wire 39 is shown. Figure 19 In the figure, there is one lead wire 39, but there may be multiple lead wires.

[0224] The holder mechanism 4H holds the lead wire 39 passing from the outside of the motor housing 4. The holder mechanism 4H holds the lead wire 39 passing from the right side of the motor housing 4. The holder mechanism 4H holds the lead wire 39 extending in the front-to-back direction. The rear end of the lead wire 39 is positioned further rearward than the motor housing 4. The front end of the lead wire 39 is positioned further forward than the motor housing 4.

[0225] The holder mechanism 4H holds the lead 39 connected to the controller 11. The controller 11 is arranged at a position closer to the rear side than the motor housing 4. The holder mechanism 4H holds the lead 39 connected to the electronic device or electronic component arranged at a position outside the motor housing 4. The holder mechanism 4H holds the lead 39 not connected to the motor 10. The holder mechanism 4H holds the lead 39 connected to the electronic device or electronic component arranged at a position closer to the front side than the motor housing 4. In an embodiment, the electronic device arranged at a position closer to the front side than the motor housing 4 includes a light-emitting unit 90. The electronic component arranged at a position closer to the front side than the motor housing 4 includes an LED chip 95B.

[0226] In the embodiment, the connector 38 is positioned further forward than the motor housing 4. The connector 38 is electrically connected to the on-board chip LED 95 of the light-emitting unit 90. The connector 38 and the on-board chip LED 95 of the light-emitting unit 90 are electrically connected. The connector 38 is connected to the on-board chip LED 95 of the light-emitting unit 90 via leads (not shown). The connector 38 is connected to the substrate 95A of the on-board chip LED 95 via leads (not shown). The connector 38 is housed in the main body 21 of the main housing 2. The connector 38 is positioned below the first cylindrical portion 61 of the hammer case 6. The connector 38 is positioned in front of the motor housing 4. In the left-right direction, the center of the connector 38 coincides with the center of the motor housing 4. The connector 38 is fixed to the bottom surface of the first cylindrical portion 61. The connector 38 may also be fixed to the main body 21.

[0227] 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 substrate 95A of the light-emitting unit 90 via the connector 38. The controller 11 is connected to the substrate 95A of the light-emitting unit 90 via the lead wire 39 and the connector 38. The holder mechanism 4H holds the intermediate portion of the lead wire 39 connected to the controller 11 and the connector 38, respectively.

[0228] 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.

[0229] The holder mechanism 4H includes a base rib 4G protruding from the right portion of the motor case 4 and a hook rib 4F protruding from the right portion of the motor case 4. The base rib 4G and the hook rib 4F are provided on the outer surface of the motor case 4, respectively.

[0230] The base rib 4G protrudes rightward from the right side of the cylindrical portion 4A. There is one base rib 4G. No base rib 4G is provided on the left side of the cylindrical portion 4A. The base rib 4G supports the lead 39 from below.

[0231] The hook rib 4F is arranged at a position further upward than the base rib 4G. The hook rib 4F is separated from the base rib 4G. In the embodiment, the motor housing 4 has a protrusion 4D protruding from the upper portion of the outer peripheral surface of the cylinder 4A toward the side. The outer shape of the protrusion 4D is substantially a rectangular parallelepiped. Figure 26 、 Figure 27 ,as well as Figure 28 As shown in FIG. 4 , protrusions 4D are provided on the upper portion of the left side and the upper portion of the right side of the barrel 4A. Hook ribs 4F are provided on the protrusion 4D on the right side of the barrel 4A. There are two hook ribs 4F. No hook ribs 4F are provided on the protrusion 4D on the left side of the barrel 4A. In the vertical direction, the lead 39 is arranged between the base rib 4G and the hook rib 4F. The hook rib 4F supports the lead 39 from the right side to prevent the lead 39, which is supported by the base rib 4G, from falling off the base rib 4G.

[0232] The hook rib 4F protrudes downward from the right end of the lower surface of the protrusion 4D. The two hook ribs 4F are spaced apart in the front-to-back direction. In the vertical 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 of the cylindrical portion 4A, further downward than the protrusion 4D. In the front-to-back direction, the base rib 4G is positioned between the front hook rib 4F and the rear hook rib 4F.

[0233] like Figure 19 As shown, the left main body housing 2L includes a holder 2H for holding the lead wire 39. The holder 2H has a recess for inserting the lead wire 39. The holder 2H protrudes rightward from the right end surface of the left main body housing 2L. The holder 2H is positioned in front of the motor housing 4. The holder 2H is positioned below the connector 38. In the vertical direction, the holder 2H is positioned above the hook rib 4F. The lead wire 39 is held by the holder 2H between the holder mechanism 4H and the connector 38.

[0234] like Figure 19As shown, the electronic component 11D is positioned between the controller 11 and the light-emitting unit 90 in the front-to-back direction. A capacitor is exemplified as the electronic component 11D. The electronic component 11D is housed in the main body 21 or the protrusion 22 of the main housing 2. The electronic component 11D is positioned below the motor housing 4. The center of the electronic component 11D coincides with the center of the motor housing 4 in the left-right direction. The electronic component 11D is fixed to the main body 21 or the protrusion 22. Alternatively, the electronic component 11D may be fixed to the bottom surface of the motor housing 4.

[0235] The 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 the middle portion of the lead wire 390 connecting the controller 11 and the electronic component 11D.

[0236] [Motor housing and gear box]

[0237] Figure 21 It is an exploded perspective view showing a portion of the impact tool 1 according to the embodiment as viewed from the right front side. Figure 22 It is an exploded perspective view showing a portion of the impact tool 1 according to the embodiment as viewed from the left rear side. Figure 23 It is an exploded perspective view showing the motor case 4 and the baffle 30 according to the embodiment as viewed from the right front side. Figure 24 This is a diagram showing the motor case 4 , the inner member 80 , and the stator 47 according to the embodiment as viewed from above. Figure 25 This is a diagram showing the motor case 4 , the inner member 80 , and the stator 47 according to the embodiment as viewed from the lower right rear side. Figure 26 It is an exploded perspective view showing the motor case 4 , the inner member 80 , and the stator 47 according to the embodiment as viewed from the right front side. Figure 27 It is an exploded perspective view showing the motor case 4 , the inner member 80 , and the stator 47 according to the embodiment as viewed from the left rear side. Figure 28 It is an exploded perspective view showing the motor case 4 , the inner member 80 , and the stator 47 according to the embodiment as viewed from the lower right rear side. Figure 29 It is an exploded perspective view showing the gear case 5 and the bearing cover 40 according to the embodiment as viewed from the right rear side.

[0238] In the following description, the direction parallel to the motor rotation axis MX will be referred to as the axial direction, the direction around the motor rotation axis MX will be referred to as the circumferential direction or the rotational direction, and the direction radial from the motor rotation axis MX will be referred to as the radial direction. Furthermore, in the radial direction, a position closer to the motor rotation axis MX or a direction close to the motor rotation axis MX will be referred to as the radial inner side, and a position farther from the motor rotation axis MX or a direction away from the motor rotation axis MX will be referred to as the radial outer side.

[0239] The motor case 4 holds the stator 47. The motor case 4 holds the stator 47 via the inner member 80. The motor case 4 is arranged below the gear case 5. The motor case 4 is fixed to the gear case 5.

[0240] The motor housing 4 is made of a magnesium alloy. An example of a magnesium alloy forming the motor housing 4 is MDC1D, a Mg-Al-Zn magnesium alloy. The motor housing 4 is manufactured using a die-casting method. The specific gravity of a magnesium alloy is lower than that of aluminum. The strength of a magnesium alloy is higher than that of synthetic resins such as polycarbonate resin. By manufacturing the motor housing 4 from a magnesium alloy, it is possible to achieve both high strength and light weight.

[0241] Motor housing 4 includes a cylindrical portion 4A disposed around motor 10, a lower wall portion 4B disposed at the lower end of cylindrical portion 4A, protrusions 4D provided at the upper portions of the left and right sides of cylindrical portion 4A, and a plurality of threaded bosses 4P disposed around the upper end of cylindrical portion 4A. Cylindrical portion 4A, lower wall portion 4B, protrusions 4D, and threaded bosses 4P are integrally formed.

[0242] The gear box 5 houses at least a portion of the speed reduction mechanism 13. The gear box 5 is disposed at a rear side of the hammer case 6. The gear box 5 is fixed to the hammer case 6.

[0243] The gearbox 5 is made of a magnesium alloy. An example of a magnesium alloy forming the gearbox 5 is MDC1D, a Mg-Al-Zn magnesium alloy. The gearbox 5 is manufactured using a die-casting method. The specific gravity of a magnesium alloy is lower than that of aluminum. The strength of a magnesium alloy is higher than that of synthetic resins such as polycarbonate resin. By manufacturing the gearbox 5 from a magnesium alloy, it is possible to achieve both high strength and light weight.

[0244] The gear box 5 is substantially cylindrical. An opening is provided at the front of the gear box 5. An opening is provided at the rear of the gear box 5. An opening is provided at the bottom of the gear box 5. The bearing cover 40 is arranged at the opening at the rear of the gear box 5. The bearing cover 40 is fixed to the rear of the gear box 5 by three screws 40S. Figure 29As shown, three threaded bosses 40A are provided on the periphery of the bearing cap 40. Each of the three threaded bosses 40A has an opening 40B. A screw 40S is inserted from the rear side of the bearing cap 40 into the opening 40B. The screw 40S is then inserted into the threaded hole 5C provided at the rear end of the gear case 5. After the screw 40S is inserted from the rear side of the threaded boss 40A into the opening 40B of the threaded boss 40A, it is further inserted into the threaded hole 5C provided at the rear end of the gear case 5.

[0245] The gearbox 5 and hammer case 6 are secured together using four screws 41. Four threaded bosses 5B are provided on the front periphery of the gearbox 5. Four threaded bosses 6B are provided on the rear periphery of the hammer case 6. The screws 41 are inserted into the openings provided in the threaded bosses 5B of the gearbox 5. The screws 41 are inserted into the threaded holes provided in the threaded bosses 6B of the hammer case 6. The screws 41 are inserted from the rear side of the threaded bosses 5B into the openings of the threaded bosses 5B and then into the threaded holes of the threaded bosses 6B.

[0246] An opening is provided at the upper portion of the motor housing 4. An opening is provided at the lower portion of the gear box 5. The internal space of the motor housing 4 and the internal space of the gear box 5 are connected via the opening at the upper portion of the motor housing 4 and the opening at the lower portion of the gear box 5. The motor housing 4 and the gear box 5 are fixed by four screws 5S. Four threaded bosses 4P are provided on the peripheral portion of the upper portion of the motor housing 4. An opening 4Q is provided on each of the four threaded bosses 4P. The screw 5S is inserted from the lower side of the threaded boss 4P into the opening 4Q. The screw 5S is inserted into the threaded hole provided at the lower end portion of the gear box 5. After the screw 5S is inserted from the lower side of the threaded boss 4P into the opening 4Q of the threaded boss 4P, it is inserted into the threaded hole provided at the lower end portion of the gear box 5.

[0247] Stator 47 includes a stator core 47A, an insulator 47B fixed to stator core 47A, and multiple coils 47C wound around each of the multiple teeth of stator core 47A via insulator 47B. In the embodiment, there are twelve coils 47C. Multiple coils 47C are connected via a busbar unit 47D. Busbar unit 47D is fixed to the bottom of insulator 47B.

[0248] Busbar unit 47D has three power terminals 47G. Lead wires 47H are connected to power terminals 47G. One lead wire 47H is connected to each power terminal 47G. Controller 11 and power terminals 47G are connected via lead wires 47H. Lead wires 47H are used to supply power to coils 47C of stator 47. Power from battery pack 43 is supplied to coils 47C via controller 11, lead wires 47H, and power terminals 47G. Motor 10 is driven by the power supplied via controller 11, lead wires 47H, and power terminals 47G.

[0249] An inner member 80 is disposed between the outer circumference of the stator core 47A and the inner circumference of the cylindrical portion 4A of the motor housing 4. The inner member 80 is substantially annular and is made of synthetic resin. The inner member 80 is made of glass fiber reinforced polycarbonate resin.

[0250] The inner member 80 includes an annular base portion 81, an outer convex portion 82 projecting radially outward from the outer circumferential surface of the base portion 81, and an inner convex portion 83 projecting radially inward from the inner circumferential 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 substantially a rectangular parallelepiped elongated in the vertical direction. Three inner convex portions 83 are provided at intervals in the circumferential direction. The inner convex portions 83 are elongated in the vertical direction.

[0251] 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.

[0252] The outer circumferential surface of the stator core 47A is provided with a groove 47F. The groove 47F is elongated in the vertical direction. Three grooves 47F are provided, spaced apart in the circumferential direction. The inner protrusion 83 is inserted into the inner side of the groove 47F. By inserting the inner protrusion 83 into the inner side of the groove 47F, the relative position between the stator 47 and the inner member 80 is prevented from shifting in the rotational direction.

[0253] A recess 4K is provided on the inner circumferential surface of the cylindrical portion 4A of the motor housing 4. The recess 4K is elongated in the vertical direction. Four recesses 4K are provided, spaced apart in the circumferential direction. The outer protrusion 82 is inserted into the inner side of the recess 4K. This insertion of the outer protrusion 82 into the inner side of the recess 4K prevents the relative position of the inner member 80 and the motor housing 4 from shifting in the rotational direction.

[0254] An opening 4C is provided at the rear of the cylindrical portion 4A of the motor housing 4. An opening 4M is provided at the rear of the lower wall portion 4B of the motor housing 4. A reinforcing rib 4N is provided at the boundary between openings 4C and 4M. The left end of the reinforcing rib 4N is fixed to the cylindrical portion 4A or the lower wall portion 4B. The right end of the reinforcing rib 4N is fixed to the cylindrical portion 4A or the lower wall portion 4B. The reinforcing rib 4N is integral with the cylindrical portion 4A and the lower wall portion 4B. Multiple vents 4L are provided in the lower wall portion 4B.

[0255] As reference Figure 11As described above, the sensor substrate 50 is fixed to the busbar unit 47D of the stator 47. The sensor substrate 50 is housed in the motor housing 4. The sensor substrate 50 includes a circuit substrate 50A and a magnetic sensor 50B supported by the circuit substrate 50A. The sensor substrate 50 detects the position of the rotor 48 in the rotation direction. A plurality of lead wires 50C are connected to the sensor substrate 50. Figure 25 As shown, there are five lead wires 50C connected to the sensor substrate 50. The lead wires 50C connect the sensor substrate 50 and the controller 11. The 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.

[0256] like Figure 25 As shown, lead wires 47H connecting power terminals 47G of stator 47 and controller 11 pass through opening 4C provided at the rear of cylinder 4A. Lead wires 50C connecting sensor substrate 50 and controller 11 pass through opening 4M provided at the rear of lower wall 4B.

[0257] Controller 11 is located at the rear of motor housing 4. Power terminals 47G are located behind stator core 47A inside motor housing 4. Lead wires 47H pass through opening 4C provided at the rear of cylindrical portion 4A, thereby preventing excessive bending of lead wires 47H or excessive tension from acting on them.

[0258] The controller 11 is located at the rear side of the motor housing 4. The sensor substrate 50 is located below the stator core 47A inside the motor housing 4. Since the lead wires 50C pass through the openings 4M provided at the rear of the lower wall 4B, the lead wires 50C are prevented from being excessively bent or subjected to excessive tension.

[0259] By arranging the reinforcing rib 4N at the boundary between the opening 4C and the opening 4M, a decrease in the strength of the motor case 4 is suppressed.

[0260] The baffle 30 is disposed at the upper end portion of the motor housing 4. The baffle 30 includes an annular base portion 30A and four screw bosses 30B provided on the peripheral edge of the base portion 30A. The screw bosses 30B are provided with openings 30C.

[0261] The protrusion 4D of the motor housing 4 has a recess 4E. The recess 4E is recessed downward from the top surface of the protrusion 4D. The protrusion 4D is provided on the upper portion of the left side and the upper portion of the right side of the cylindrical portion 4A. Two recesses 4E are provided along the front-to-back direction on the protrusion 4D on the left side of the cylindrical portion 4A. Two recesses 4E are provided along the front-to-back direction on the protrusion 4D on the right side of the cylindrical portion 4A. Each of the four recesses 4E is provided with a threaded hole 4R.

[0262] The base portion 30A is inserted into the inner side of the opening at the upper end of the cylindrical portion 4A. With the base portion 30A inserted into the inner side of the opening at the upper end of the cylindrical portion 4A, the threaded boss 30B is inserted into the inner side of the recess 4E. With the threaded boss 30B inserted into the inner side of the recess 4E, the positions of the opening 30C and the threaded hole 4R are aligned.

[0263] The baffle 30 is secured to the upper end of the motor housing 4 with four screws 30S. The screws 30S are inserted from the upper side of the threaded boss 30B into the opening 30C. The screws 30S are then inserted into the threaded holes 4R provided in the recessed portion 4E of the motor housing 4. After being inserted from the upper side of the threaded boss 30B into the opening 30C of the threaded boss 30B, the screws 30S are further inserted into the threaded holes 4R provided in the motor housing 4. The screws 30S engage with the threaded holes 4R.

[0264] [Handle]

[0265] Figure 30 1 is a diagram showing the impact tool 1 according to the embodiment as viewed from the right side. The grip 23 is grasped by the operator. The grip 23 is arranged at a position on the rear side of the main body 21. The grip 23 includes: a rear grip 23A extending from the rear of the controller housing 24 toward the upper side, and an upper grip 23B extending from the upper end of the rear grip 23A toward the front side. The lower end of the rear grip 23A is connected to the controller housing 24. The upper end of the rear grip 23A is connected to the rear end of the upper grip 23B. The front end of the upper grip 23B is connected to the upper part of the main body 21. The grip 23, the main body 21, and the controller housing 24 form a D-shaped handle. The D-shaped handle is arranged at a position on the rear side of the motor 10.

[0266] The total length Lt of the impact tool 1 is 440 mm or less. In the embodiment, the total length Lt of the impact tool 1 is 435 mm. The total length Lt of the impact tool 1 refers to the maximum dimension of the impact tool 1 in the front-to-back direction parallel to the output rotation axis AX. Figure 30As shown, in the embodiment, the total length Lt of the impact tool 1 is the distance in the front-to-back direction between the front end of the anvil 16 and the rear end of the main housing 2. The rear end of the main housing 2 corresponds to the rear end of the controller housing 24. Since the total length Lt of the impact tool 1 is 440 mm or less, the impact tool 1 can be miniaturized, thereby improving operability.

[0267] The spatial length Lg of the grip portion 23 is greater than 90 mm. In the embodiment, the spatial length Lg of the grip portion 23 is 92 mm. The so-called 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-to-back direction parallel to the output rotation axis AX. The grip portion 23, the main body 21 and the controller housing 24 form a D-shaped handle. The so-called inner space of the grip portion 23 refers to the space surrounded by the grip portion 23, the main body 21 and the controller housing 24. Figure 30 As shown, 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 .

[0268] Figure 31 as well as Figure 32 Each of these diagrams shows an example of a method of grasping the grip portion 23 according to the embodiment. Figure 31 The figure shows a state where the operator's right hand grasps the rear grip 23A. Figure 32 The figure shows a state in which the operator's right hand grasps a part of the rear grip 23A while grasping the upper grip 23B.

[0269] like Figure 31 As shown, the operator can pull the trigger shifter 17A rearward with the index and middle fingers while holding the rear grip 23A with the right hand. Alternatively, the operator can slide the forward / reverse switching shifter 29 in the front-to-back direction with the index finger, for example, while holding the rear grip 23A with the right hand.

[0270] like Figure 32 As shown, the operator can pull the trigger shifter 17A rearward with the middle finger and ring finger while holding the rear grip 23A and the upper grip 23B with the right hand. Alternatively, the operator can slide the forward / reverse switching shifter 29 in the front-to-back direction with, for example, the index finger while holding the rear grip 23A and the upper grip 23B with the right hand.

[0271] like Figure 32As shown, for example, depending on the location of the work object or the presence of obstacles around the work object, the operator may pull the trigger shifter 17A while grasping the rear grip 23A and the upper grip 23B. In other words, depending on the work situation, the operator's grasping of the upper grip 23B may improve workability. In this embodiment, since the spatial length Lg of the grip 23 is greater than 90 mm, the operator can easily grasp the upper grip 23B. This improves workability.

[0272] [Interface Panel]

[0273] Figure 33 It is a perspective view showing the interface panel 19 according to the embodiment as viewed from the right rear side. Figure 34 1 is a perspective view illustrating a holding structure of the interface panel 19 according to the embodiment, as viewed from the right rear side. Figure 35 It is an exploded perspective view showing the interface panel 19 according to the embodiment as viewed from the right rear side.

[0274] The interface panel 19 is located in the panel retaining portion 25 of the main housing 2. The panel retaining portion 25 is configured to extend from the front of the controller housing 24 toward the front and upward. The surface of the interface panel 19 is tilted downward toward the rear. Because the interface panel 19 is located in the panel retaining portion 25, the operator can visually observe the interface panel 19 smoothly while grasping the grip 23. In other words, because the interface panel 19 is tilted downward toward the rear, the operator can easily visually observe the interface panel 19 while using the impact tool 1.

[0275] like Figure 33 As shown, the interface panel 19 includes a striking force adjustment button 19A, a light intensity adjustment button 19B, an application button 19C, four adjustment lights 19D, and two application lights 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 lights 19D are arranged in the left-right direction. The two application lights 19E are arranged in the top-bottom direction. The four adjustment lights 19D are located above the striking force adjustment button 19A and the light intensity adjustment button 19B. The upper application light 19E is located to the right of the adjustment light 19D. The lower application light 19E is located between the light intensity adjustment button 19B and the application button 19C in the left-right direction.

[0276] The striking force of the striking mechanism 15 is adjusted by pressing the striking force adjustment button 19A. The striking force is adjusted in four levels. Pressing the striking force adjustment button 19A once decreases the striking force by one level. Pressing the striking force adjustment button 19A again at the minimum striking force level returns the striking force to the maximum striking force level.

[0277] By pressing the light intensity adjustment button 19B, the light intensity of the light unit 90 is adjusted. The light intensity is adjusted in four levels. Each press of the light intensity adjustment button 19B decreases the light intensity by one level. Pressing the light intensity adjustment button 19B again at the minimum light intensity level returns the light intensity to the maximum level.

[0278] The four adjustment light emitters 19D light up or down 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.

[0279] The apply 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 values ​​of the adjustment items adjusted by the operation of the apply button 19C.

[0280] The interface panel 19 is sandwiched between the left and right main body housings 2L and 2R in the left-right direction. The panel retaining portion 25 includes a recessed portion 25L for accommodating the left portion of the interface panel 19. The right main body housing 2R includes a recessed portion 25R for accommodating the right portion of the interface panel 19. The left portion of the interface panel 19 fits into the recessed portion 25L, while the right portion of the interface panel 19 fits into the recessed portion 25R.

[0281] like Figure 35 As shown, the interface panel 19 includes a resin panel 190, a sheet 191, and a display operation substrate 192. The display operation substrate 192 faces the back of the resin panel 190. The resin panel 190 and the display operation substrate 192 are fixed together by three screws 193. The sheet 191 is attached to the surface of the resin panel 190.

[0282] Mounted on the surface of the display and operation board 192 are four adjustment light emitters 19D and two application light emitters 19E. Each of the adjustment light emitters 19D and the application light emitters 19E is a light-emitting diode. Also mounted on the surface of the display and 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.

[0283] The sheet 191 has: four transparent parts 191A, through which light from the striking force adjustment button 19A, the light intensity adjustment button 19B, the application button 19C, and the adjustment light emitter 19D can pass; and two transparent parts 191B, through which light from the application light emitter 19E can pass.

[0284] The resin panel 190 includes an elastically deformable portion 190A disposed between the striking force adjustment button 19A and the microswitch 192A, an elastically deformable portion 190B disposed between the light intensity adjustment button 19B and the microswitch 192B, and an elastically deformable portion 190C disposed between the apply button 19C and the microswitch 192C.

[0285] When the striking force adjustment button 19A is pressed, the elastic deformation portion 190A is elastically deformed, pressing the micro switch 192A. By pressing the micro switch 192A, the striking force of the striking mechanism 15 is adjusted.

[0286] When the light intensity adjustment button 19B is pressed, the elastic deformation portion 190B is elastically deformed, and the micro switch 192B is pressed. By pressing the micro switch 192B, the light intensity of the light emitting unit 90 is adjusted.

[0287] When the apply button 19C is pressed, the elastic deformation portion 190C is elastically deformed, and the micro switch 192C is pressed. By pressing the micro switch 192C, the adjustment item set by the operator is adjusted.

[0288] The resin panel 190 also includes four transmissive portions 191A through which light from the adjustment light emitter 19D passes, and two transmissive portions 191B through which light from the application light emitter 19E passes.

[0289] Resin panel 190 includes a base portion 1901 and a protrusion 1902 that protrudes upward and rearward from the rear surface of base portion 1901. Elastic deformation portions 190A, 190B, 190C, through portions 190D, and 190E are provided on protrusion 1902. Sheet material 191 is attached to the surface of protrusion 1902.

[0290] like Figure 34 As shown, the panel holding portion 25 includes a lower holding portion 25A that holds the lower portion of the base portion 1901 of the resin panel 190 , and an upper holding portion 25B that holds the upper portion of the base portion 1901 of the resin panel 190 .

[0291] The lower holding portion 25A includes grooves provided in the left and right main body housings 2L and 2R. The lower end of the base portion 1901 is inserted into and fitted into the grooves of the lower holding portion 25A.

[0292] Upper retaining portion 25B includes grooves provided in both left and right main body housings 2L and 2R. The upper end of base 1901 is inserted into the grooves of upper retaining portion 25B. Upper retaining portion 25B contacts the upper portion of the rear surface of base 1901 and the upper surface of base 1901, respectively.

[0293] The left portion of protrusion 1902 fits into recess 25L. The right portion of protrusion 1902 fits into recess 25R. By fitting protrusion 1902 into recesses 25L and 25R, base 1901 is held by lower retaining portion 25A and upper retaining portion 25B, thereby securing interface panel 19 to panel retaining portion 25.

[0294] [Action of the impact tool]

[0295] Next, the operation of the impact tool 1 will be described. For example, when tightening an object, a socket for tightening is attached to the front end of the anvil 16. After the socket is attached to the anvil 16, the operator grasps the side handle 7 with their left hand and the grip 23 with their right hand, manipulating the trigger paddle 17A to move it rearward. Manipulating the trigger paddle 17A rearward supplies power from the battery pack 43 to the motor 10, driving the motor 10 and illuminating the lamp assembly 18. Driven by the motor 10, the rotor 48 and rotor shaft 49 rotate. As the rotor shaft 49 rotates, its rotational force is transmitted to the planetary gears 55P via the first bevel gear 53, the second bevel gear 54, and the sun gear 55S. The planetary gears 55P, meshing with the internal teeth of the internal gear 55I, rotate on their own axis while orbiting around the sun gear 55S. The planetary gear 55P is rotatably supported by the main shaft 14 via the pin 55A. The main shaft 14 rotates at a rotation speed lower than the rotation speed of the rotor shaft 49 due to the revolution of the planetary gear 55P.

[0296] 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. The rotation of the anvil 16 allows the tightening operation to be performed.

[0297] When a load exceeding a specified value is applied to the anvil 16 during the tightening operation, the rotation of the anvil 16 and the hammer 71 stops. While the hammer 71 is stopped, the main shaft 14 rotates, causing the hammer 71 to move rearward. The rearward movement of the hammer 71 releases the contact between the hammer protrusion 71B and the anvil protrusion 16C. The hammer 71, having moved rearward, rotates and moves forward due to the elastic force of the first and second coil springs 73 and 74. As the hammer 71 rotates and moves forward, the anvil 16 is struck by the hammer 71 in the rotational direction. Consequently, the anvil 16 rotates with high torque about the output rotation axis AX. Thus, the bolt or nut is tightened with high torque.

[0298] According to the embodiment, the axial elastic body 91 and the radial elastic body 92 suppress the transmission of vibrations of the hammer case 6 to the light-emitting unit 90. Since the light-emitting unit 90 is vibration-proof, for example, damage to the soldered connection between the substrate 95A and the LED chip 95B or damage to wiring provided on the substrate 95A is suppressed. In other words, malfunctions of the light-emitting unit 90 are suppressed.

[0299] Furthermore, according to the embodiment, the vibration-isolating rubber 100 suppresses the transmission of vibrations of the main body housing 2 to the connecting member 44 and the battery pack 43. Since the vibration-isolating rubber 100 extends in three directions: front-to-back, up-down, and left-to-right, it is possible to attenuate vibrations applied to the connecting member 44 and the battery pack 43 in each of the three directions.

[0300] When the impact tool 1 falls and the battery pack 43 hits the floor or the ground, the battery holder 9 moves forward, causing the battery pack 43 to contact the rubber buffer 46. This can mitigate the impact on the battery pack 43.

[0301] [Effect]

[0302] As described above, in the embodiment, the impact tool 1 includes: a motor 10; a reduction mechanism 13 rotated by the motor 10; a hammer 71 rotated by the rotation of the motor 10 transmitted via the reduction mechanism 13; an anvil 16 struck in the rotational direction by the hammer 71; a motor housing 4 housing the motor 10; and a gear box 5 housing the reduction mechanism 13. One or both of the motor housing 4 and the gear box 5 are made of a magnesium alloy.

[0303] According to the above configuration, since one or both of the motor housing 4 and the gear box 5 are made of a magnesium alloy, the impact tool 1 can be both strengthened and lightweight. Magnesium alloys are stronger than synthetic resins, and their specific gravity is lower than that of aluminum.

[0304] In the embodiment, the motor case 4 includes the holder mechanism 4H that holds the lead wire 39 serving as the first lead wire passing from the outside of the motor case 4 .

[0305] According to the above-described configuration, since the lead wire 39 is held by the holder mechanism 4H, the assembling efficiency when assembling the impact tool 1 is improved.

[0306] In an embodiment, the leads 39 are not connected to the motor 10 .

[0307] According to the above configuration, the lead wires 39 that are not connected to the motor 10 are held by the holder mechanism 4H. Electric power is supplied to other electronic devices other than the motor 10 via the lead wires 39.

[0308] In the embodiment, the impact tool 1 includes a controller 11 . The lead wire 39 is connected to the controller 11 .

[0309] According to the above-described configuration, the lead wires 39 that are not connected to the controller 11 are held by the holder mechanism 4H.

[0310] In the embodiment, the controller 11 is arranged at a position further rearward than the motor case 4. The lead wires 39 are connected to electronic components arranged at a position further forward than the motor case 4.

[0311] According to the above configuration, electric power is supplied to the electronic components arranged on the front side of the motor case 4 via the lead wires 39 .

[0312] In the embodiment, the impact tool 1 includes a light emitting unit 90 including a light emitting body that illuminates the front end side of the anvil 16. The electronic component includes an LED chip 95B of the light emitting unit 90.

[0313] According to the above configuration, electric power is supplied to the LED chip 95B arranged forward of the motor case 4 via the lead wire 39. The LED chip 95B emits light by the electric power supplied via the lead wire 39.

[0314] In the embodiment, the impact tool 1 includes a connector 38 disposed forward of the motor housing 4 and electrically connected to the light-emitting unit 90. The rear end of a lead wire 39 is connected to the controller 11. The front end of the lead wire 39 is connected to the connector 38. A holder mechanism 4H holds the middle portion of the lead wire 39.

[0315] According to the above-described configuration, the intermediate portion of the lead wire 39 connecting the controller 11 and the connector 38 is held by the holder mechanism 4H.

[0316] In an embodiment, the retaining member mechanism 4H includes: a base rib 4G, which is provided on the outer surface of the motor housing 4 and supports the lead 39 from the bottom side; and a hook rib 4F, which is arranged on the outer surface of the motor housing 4 at a position further upward than the base rib 4G and supports the lead 39 from the side.

[0317] According to the above-described configuration, the lead wire 39 is held by the base rib 4G and the hook rib 4F.

[0318] In the embodiment, the motor housing 4 includes a cylindrical portion 4A disposed around the motor 10, a lower wall portion 4B disposed at the lower end of the cylindrical portion 4A, and a protrusion 4D protruding laterally from the upper portion of the outer circumferential surface of the cylindrical portion 4A. A base rib 4G protrudes from the side surface of the cylindrical portion 4A below the protrusion 4D. A hook rib 4F protrudes downward from the lower surface of the protrusion 4D.

[0319] According to the above-described configuration, the relative position between the base rib 4G and the hook rib 4F is optimized so as to be able to hold the lead wire 39 .

[0320] In the embodiment, the impact tool 1 includes a fan 12 fixed to the upper portion of the rotor shaft 49 of the motor 10, and a baffle 30 disposed at the upper end of the motor housing 4 and facing the fan 12. The baffle 30 includes an annular base portion 30A that is inserted into the opening at the upper end of the cylindrical portion 4A, and a threaded boss 30B provided on the periphery of the base portion 30A. The protrusion 4D includes an upper recess 4E, which is a recessed portion into which the threaded boss 30B is inserted when the base portion 30A is inserted into the opening at the upper end of the cylindrical portion 4A.

[0321] According to the above configuration, since the base portion 30A is inserted into the opening at the upper end of the cylindrical portion 4A and the threaded boss 30B is inserted into the recess 4E of the protruding portion 4D, the amount of upward protrusion of the baffle 30 from the motor housing 4 is reduced. This prevents the impact tool 1 from increasing in size.

[0322] In the embodiment, the screw 30S inserted into the opening 30C of the screw boss 30B is coupled to the screw hole 4R provided in the recess 4E.

[0323] With the above configuration, the motor housing 4 and the baffle 30 are secured together by screws 30S. Since the screws 30S are positioned inside the recess 4E, the amount of upward protrusion of the screws 30S from the baffle 30 is reduced. This prevents the impact tool 1 from becoming larger.

[0324] In the embodiment, the motor housing 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 impact tool 1 includes a synthetic resin inner member 80 disposed between the inner circumference of the cylindrical portion 4A and the outer circumference of the stator core 47A of the motor 10.

[0325] According to the above configuration, since the 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, wear of the motor case 4 is suppressed.

[0326] In the embodiment, the inner member 80 includes 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 convex portion 82 projecting radially outward from the outer circumferential surface of the base portion 81, and an inner convex portion 83 projecting radially inward from the inner circumferential surface of the base portion 81. The inner circumferential surface of the cylindrical portion 4A is provided with an inner recessed portion, or recess 4K, into which the outer convex portion 82 is inserted. The outer circumferential surface of the stator core 47A is provided with a groove 47F into which the inner convex portion 83 is inserted.

[0327] According to the above configuration, the inner protrusion 83 is inserted into the inner side of the groove portion 47F, thereby suppressing the relative position between the stator 47 and the inner member 80 from changing in the rotational direction. The outer protrusion 82 is inserted into the inner side of the recess 4K, thereby suppressing the relative position between the inner member 80 and the motor case 4 from changing in the rotational direction.

[0328] In the embodiment, the impact tool 1 includes a controller 11 located at the rear of the motor housing 4 and controlling the motor 10, and a sensor substrate 50 housed in the motor housing 4 and detecting the rotational position of the rotor of the motor 10. The motor housing 4 includes a cylindrical portion 4A surrounding the motor 10 and a lower wall portion 4B located 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 located behind the stator core 47A inside the motor housing 4. The sensor substrate 50 is located below the stator core 47A inside the motor housing 4. An opening 4C, serving as a first opening, is provided at the rear of the cylindrical portion 4A. An opening 4M, serving as a second opening, is provided at the rear of the lower wall portion 4B. A lead 47H, serving as a second lead connecting the power terminal 47G to the controller 11, passes through the opening 4C. The lead 50C, which is a third lead connecting the sensor substrate 50 and the controller 11 , passes through the opening 4M.

[0329] According to the above configuration, since lead wire 47H passes through opening 4C provided in the rear portion of barrel portion 4A, excessive bending of lead wire 47H or excessive tension acting on lead wire 47H is suppressed. Since lead wire 50C passes through opening 4M provided in the rear portion of lower wall portion 4B, excessive bending of lead wire 50C or excessive tension acting on lead wire 50C is suppressed.

[0330] In the embodiment, the motor case 4 includes the reinforcement rib 4N provided at the boundary between the opening 4C and the opening 4M and integrated with the cylindrical portion 4A and the lower wall portion 4B.

[0331] According to the above-described configuration, by arranging the reinforcement rib 4N at the boundary between the opening 4C and the opening 4M, a decrease in the strength of the motor case 4 is suppressed.

[0332] In the embodiment, the impact tool 1 includes a main body housing 2 made of synthetic resin that accommodates a motor housing 4. An anvil 16 rotates about an output rotation axis AX extending in the front-to-back direction. The total length Lt, which represents the distance in the front-to-back direction between the front end of the anvil 16 and the rear end of the main body housing 2, is 440 mm or less.

[0333] According to the above-described configuration, the impact tool 1 is prevented from being enlarged, and the workability of the work using the impact tool 1 is improved.

[0334] In the embodiment, the main housing 2 includes a main body 21 that houses the motor housing 4, a grip 23 located at the rear of the main body 21, and a controller housing 24 located below the grip 23. The grip 23 includes a rear grip 23A extending upward from the rear of the controller housing 24, and an upper grip 23B extending forward from the upper end of the rear grip 23A. The front end of the upper grip 23B is connected to the upper portion of the main body 21. The space length Lg, which represents the maximum dimension in the front-to-back direction of the space enclosed by the grip 23, the main body 21, and the controller housing 24, is 90 mm or greater.

[0335] With the above-described configuration, when grasping the grip portion 23, the operator can easily grasp only the rear grip portion 23A, or simultaneously grasp a portion of the rear grip portion 23A and a portion of the upper grip portion 23B. Furthermore, when grasping the grip portion 23, the operator's fingers are less likely to interfere with the main body 21, making it easier to grasp. Since various grasping methods can be adopted depending on the working situation, operability is improved.

[0336] In the embodiment, the upper end portion of the motor case 4 and the lower end portion of the gear box 5 are fixed by screws 5S.

[0337] According to the above-described configuration, the motor housing 4 and the gear box 5 arranged in the vertical direction are fixed by the screws 5S.

[0338] In the embodiment, the rotor 48 of the motor 10 rotates about the motor rotation axis MX extending in the vertical direction. The speed 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 the output rotation axis extending in the front-rear direction.

[0339] According to the above-described configuration, since the motor rotation axis MX and the output rotation axis AX are orthogonal to each other, the overall length Lt of the impact tool 1 can be shortened.

[0340] In the embodiment, the impact tool 1 includes a hammer case 6 disposed in front of the gear case 5 and accommodating the hammer 71. The motor case 4 and the gear case 5 are both made of magnesium alloy, and the hammer case 6 is made of aluminum.

[0341] According to the above configuration, since both the motor housing 4 and the gear box 5 are made of magnesium alloy, it is possible to achieve both increased strength and reduced weight of the motor housing 4 and the gear box 5. Since the hammer case 6 is made of aluminum, which is stronger than magnesium alloy, even when 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.

[0342] [Other embodiments]

[0343] In the above embodiment, both the motor case 4 and the gear box 5 are made of a magnesium alloy. However, one of the motor case 4 and the gear box 5 may be made of a magnesium alloy while the other may not be made of a magnesium alloy.

[0344] In the above embodiment, the axial elastic body 91 and the radial elastic body 92 are each annular. The axial elastic body 91 may be provided at multiple locations around the second cylindrical portion 62. The radial elastic body 92 may also be provided at multiple locations around the second cylindrical portion 62.

[0345] In the above 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 divided into left and right. The battery holder 9 can also be divided into upper and lower parts.

[0346] In the above embodiment, the impact tool 1 is an impact wrench. The impact tool may also be an impact driver. The anvil of the impact driver has an insertion hole for inserting a tip tool and a chuck mechanism for holding the tip tool.

[0347] In the above embodiment, the battery pack 43 mounted on the battery holder is used as the power source of the impact tool 1. As the power source of the impact tool 1, a commercial power source (AC power source) may also be used.

[0348] In the above embodiment, the motor 10 is an inner rotor type brushless motor. However, the motor 10 may be an outer rotor type or a brushed motor.

[0349] The electric impact tool 1 may also be other electric tools, specifically, an electric hammer, an electric cutter, an electric circular saw, an electric chain saw, an electric lawn mower, an electric lawn mower, an electric grinder, etc.

Claims

1. An impact tool, characterized in that: 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 in a rotational direction by the hammer; a motor housing accommodating the motor; and a gear box accommodating the reduction mechanism. One or both of the motor housing and the gear box are made of a magnesium alloy.

2. The impact tool according to claim 1, wherein The motor housing includes a holder mechanism for holding a first lead wire passing through the outside of the motor housing.

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

4. The impact tool according to claim 3, wherein The impact tool includes a controller, The first lead is connected to the controller.

5. The impact tool according to claim 4, wherein The controller is arranged at a position further rearward than the motor housing. The first lead is connected to an electronic component disposed further forward than the motor housing.

6. The impact tool according to claim 5, wherein The impact tool includes: a light emitting unit including a light emitting body for irradiating the front end side of the anvil; The electronic component includes: the LED chip of the light-emitting unit.

7. The impact tool according to claim 6, wherein: The impact tool includes a connector disposed further forward than the motor housing and electrically connected to the light emitting unit. The rear end of the first lead is connected to the controller. The front end portion of the first lead is connected to the connector, The holder mechanism holds the middle portion of the first lead.

8. The impact tool according to claim 2, wherein The retainer mechanism includes: a base rib provided on the outer surface of the motor housing and supporting the first lead from below; and a hook rib arranged on the outer surface of the motor housing at a position upward of the base rib and supporting the first lead from the side.

9. The impact tool according to claim 8, wherein The motor housing includes a cylindrical portion disposed around the motor, a lower wall portion disposed at a lower end portion of the cylindrical portion, and a protruding portion protruding laterally from an upper portion of an outer peripheral surface of the cylindrical portion. The base rib protrudes from the side surface of the cylindrical portion at a position lower than the protruding portion. The hook rib protrudes downward from a lower surface of the protruding portion.

10. The impact tool according to claim 9, wherein The impact tool includes: a fan fixed to an upper portion of a rotor shaft of the motor; and a baffle disposed at an upper end portion of the motor housing and facing the fan. The baffle includes: an annular base portion inserted into the opening of the upper end portion of the cylindrical portion; and a threaded boss provided on the peripheral edge of the base portion. The protruding portion includes an upper recessed portion into which the threaded boss is inserted when the base portion is inserted into the opening of the upper end portion of the cylindrical portion.

11. The impact tool according to claim 10, wherein A screw inserted into the opening of the threaded boss is engaged with a threaded hole provided in the upper recessed portion.

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

13. The impact tool according to claim 12, wherein The inner member includes: 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 convex portion protruding radially outward from the outer circumferential surface of the base portion; and an inner convex portion protruding radially inward from the inner circumferential surface of the base portion. The inner circumferential surface of the cylinder is provided with an inner concave portion for inserting the outer convex portion. A groove portion into which the inner convex portion is inserted is provided on the outer peripheral surface of the stator core.

14. The impact tool according to claim 2, wherein The impact tool includes: a controller disposed at a rear side of the motor housing and controlling the motor; and a sensor substrate housed in the motor housing and detecting a position of a rotor of the motor in a rotational direction. The motor housing includes a cylindrical portion disposed around the motor and a lower wall portion disposed at a lower end portion of the cylindrical portion. The stator of the motor includes a stator core and a power supply terminal arranged at a rear side of the stator core inside the motor housing. The sensor substrate is arranged inside the motor housing at a position below the stator core. A first opening is provided at the rear of the cylinder. A second opening is provided at the rear portion of the lower wall portion. A second lead connecting the power terminal and the controller passes through the first opening. A third lead connecting the sensor substrate and the controller passes through the second opening.

15. The impact tool according to claim 14, wherein The motor housing includes a reinforcement rib provided at a boundary between the first opening and the second opening and integrally formed with the cylindrical portion and the lower wall portion.

16. The impact tool according to claim 1, wherein The impact tool includes: a main body housing made of synthetic resin for housing the motor housing; The anvil rotates around an output rotation axis extending in the front-back direction. The total length indicating the distance between the front end portion of the anvil and the rear end portion of the main body housing in the front-to-back direction is 440 mm or less.

17. The impact tool according to claim 16, wherein The main housing includes a main body portion for housing the motor housing, a grip portion disposed at a rear side of the main body portion, and a controller housing portion disposed at a lower side of the grip portion. The grip portion includes a rear grip portion extending upward from the rear portion of the controller housing portion, and an upper grip portion extending forward from the upper end portion of the rear grip portion. The front end portion of the upper grip portion is connected to the upper portion of the main body portion, A space length indicating the maximum dimension in the front-to-back direction of a space surrounded by the grip portion, the main body portion, and the controller housing portion is 90 mm or greater.

18. The impact tool according to claim 1, wherein The upper end portion of the motor housing and the lower end portion of the gear box are fixed by screws.

19. The impact tool according to claim 18, wherein The rotor of the motor rotates around a motor rotation axis extending in the vertical direction. The speed 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.

20. The impact tool according to claim 1, wherein The impact tool includes a hammer housing disposed in front of the gear box and housing the hammer. Both the motor housing and the gear box are made of magnesium alloy, and the hammer housing is made of aluminum.

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