Electric tool

Abstract

The invention provides an electric tool, which can realize miniaturization of a gear part in a bent electric tool. The electric tool includes: a grip portion extending in a front-rear direction; a motor housing part disposed in front of the grip part; a motor disposed inside the motor housing part and having a stator and a rotor capable of rotating relative to the stator; a bevel gear that rotates integrally with the rotor and has a shaft extending in the front-rear direction; a main shaft that rotates directly or indirectly by means of a bevel gear and extends in a direction intersecting the front-rear direction; a tip tool holding part that is rotated by the main shaft; a housing that accommodates the bevel gear and the main shaft; and a bearing that is held by the housing and that rotatably holds the bevel gear.

Description

Technical Field

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

[0002] Patent Document 1 discloses a pistol-type power tool. This angled power tool is capable of operating in confined spaces where the tip of a pistol-type power tool cannot fit. The tip of the angled power tool is bent like a rod, and the motor shaft and output shaft are not parallel. Therefore, the angled power tool can be inserted into confined working areas to perform tightening operations.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5844970 Summary of the Invention

[0006] In order to use angled power tools for operations in narrow spaces, the gear and bearing components must be miniaturized. Furthermore, when bevel gears are used to prevent the motor shaft and output shaft from being parallel, thrust loads are sometimes generated in the bevel gears as the rotational force is transmitted, requiring proper bevel gear retention.

[0007] The technology disclosed in this specification aims to achieve miniaturization of a gear portion in an angled power tool. In addition, the technology disclosed in this specification aims to appropriately hold a bevel gear in an angled power tool.

[0008] This specification discloses an electric tool. The electric tool may include: a grip extending in the front-to-back direction; a motor housing disposed in front of the grip; a motor disposed within the motor housing and having a stator and a rotor rotatable relative to the stator; a bevel gear rotating integrally with the rotor and having a shaft extending in the front-to-back direction; a spindle rotating directly or indirectly via the bevel gear and extending in a direction intersecting the front-to-back direction; a tool tip holder rotating via the spindle; a housing accommodating the bevel gear and the spindle; and a bearing retained by the housing and rotatably retaining the bevel gear.

[0009] Effects of the Invention

[0010] According to the above configuration, the gear portion can be miniaturized in the angled power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view showing an electric power tool according to the embodiment.

[0012] Figure 2It is a side view showing the electric power tool according to the embodiment.

[0013] Figure 3 It is a bottom view showing the electric power tool according to the embodiment.

[0014] Figure 4 It is a longitudinal sectional view showing the electric power tool according to the embodiment.

[0015] Figure 5 It is a longitudinal sectional view showing a motor housing portion of the electric power tool according to the embodiment.

[0016] Figure 6 It is a longitudinal sectional view showing a housing of the electric power tool according to the embodiment.

[0017] Figure 7 It is a cross-sectional view of the electric power tool according to the embodiment, taken along the left-right direction of the anvil.

[0018] Figure 8 It is a perspective view showing an operation panel according to the embodiment.

[0019] Figure 9 Schematic diagram showing the assembly of the battery pack according to the embodiment to the battery holding portion.

[0020] Figure 10 It is a longitudinal sectional view taken along the front-rear direction showing the lamp unit according to the embodiment.

[0021] Figure 11 It is an exploded perspective view showing the structure of the lamp unit according to the embodiment.

[0022] Figure 12 This is a perspective view showing the front portion of the electric power tool according to the embodiment as viewed from below.

[0023] Figure 13 This is an exploded perspective view showing the assembly of the lamp cover to the hammer housing according to the embodiment as viewed from below.

[0024] Figure 14 It is a perspective view showing a hammer case according to the embodiment as viewed from below.

[0025] Figure 15 This is a bottom view of the hammer housing with the lamp cover removed.

[0026] Figure 16 It is a perspective view showing a lampshade.

[0027] Figure 17 It is a longitudinal sectional view showing the periphery of the bevel gear of the electric power tool according to the embodiment.

[0028] Figure 18 It is an exploded perspective view showing the rear surface of the housing according to the embodiment.

[0029] Figure 19 It is an exploded perspective view showing the front surface of the motor housing portion according to the embodiment.

[0030] Figure 20 It is an exploded perspective view showing a bevel gear, a bearing, and an intermediate support member according to the embodiment.

[0031] Figure 21 It is a longitudinal sectional view showing the intermediate support member according to the embodiment.

[0032] Figure 22 It is an exploded perspective view showing a subassembly of a rotor according to the embodiment.

[0033] Figure 23 It is a perspective view showing an intermediate support member according to a second embodiment.

[0034] Figure 24 It is an exploded perspective view showing a subassembly of a motor according to a second embodiment.

[0035] Figure 25 It is a cross-sectional view showing an intermediate support member according to a third embodiment.

[0036] Figure 26 It is a cross-sectional view showing an intermediate support member according to a fourth embodiment.

[0037] Figure 27 It is a longitudinal sectional view showing the periphery of an intermediate support member according to a fourth embodiment.

[0038] Figure 28 It is a longitudinal sectional view showing an intermediate support member and a fixing member according to a fifth embodiment.

[0039] Figure 29 It is a longitudinal sectional view showing the front portion of an electric power tool according to a sixth embodiment.

[0040] Description of Reference Numerals

[0041] 1…Power tool; 1A…Power tool; 2…Casing; 2S…Screw; 4…Casing; 4A…Casing body; 4B…Lid; 4F…Casing flange; 4H…Boss; 4S…Screw; 6…Motor; 7…Reduction mechanism; 8…Spindle; 8A…Flange; 8B…Spindle shaft; 8C…Spindle gear; 8D…Cylinder; 8F…Spindle groove; 9…Strike mechanism; 10…Anvil; 10A…Anvil shaft; 10B…Anvil protrusion; 10C…Anvil recess; 12…Fan; 13…Battery mounting portion; 14…Trigger shifter; 14A…Switch body; 15…Forward / reverse switching shifter; 16…Operation panel; 16A…Operation button; 16B…Indicator display; 16C…Circuit board; 16D… Bracket; 17…lamp unit; 18…controller; 19…air inlet; 20…exhaust outlet; 21…motor housing; 21A…rear retaining portion; 21B…panel opening; 21C…retaining groove; 21D…lower opening; 21E…annular rib; 21F…housing flange; 21G…support wall; 21H…screw insertion hole; 21J…protrusion; 22…grip; 23…battery retaining portion; 25…battery pack; 25A…engaging hook; 26…stator; 27…rotor; 28…stator core; 29…front insulator; 30…rear insulator; 31…coil; 32…rotor core; 33…rotor shaft; 34…rotor magnet; 35…bevel gear; 37…sensor substrate; 38F…bearing; 38R…bearing; 41…first reduction gear; 41A…driven gear; 41B…first intermediate gear; 41C…first intermediate shaft; 41D…intermediate bearing; 42…second reduction gear; 42A…second intermediate gear; 42B…second intermediate shaft; 42C…intermediate bearing; 44…spindle bearing; 45…washer; 46…anvil bearing; 46A…groove; 46B…sealing member; 47…hammer; 47A…hammer groove; 47B…hammer protrusion; 47C…recess; 47D…main body; 48…ball bearing; 49…coil spring; 50…ball bearing; 51…tip tool holding portion; 52…washer; 53…illuminator; 54…substrate; 55…dam; 56…fluorescent body; 57…optical member; 57A…outer cylinder; 57B…inner cylinder 57C…light-transmitting portion; 57D…protrusion; 58…molded resin; 59…buffer member; 60…lamp cover; 60S…screw; 61…illuminator holding portion; 61A…peripheral wall portion; 61B…locking portion; 61H…boss portion; 62…cover portion; 62A…claw portion; 63…cover recess; 65…lead wire; 65A…first lead wire; 65B…second lead wire; 66…connector; 66A…connector; 66B…connector; 67…ground wiring; 70…screw; 71…inner race; 72…outer race; 73…ball bearing; 81…mounting surface; 81A…screw hole; 82…cylindrical portion; 83…guide protrusion; 84…groove portion; 84A…passageway portion; 84B…ground terminal; 85…accommodating recess; 85A…radial support surface;85B…front support surface; 85C…O-ring; 85D…groove; 86…outer cylinder; 87…inner cylinder; 88…hole; 89…engaging hole; 91…intermediate support member; 91A…intermediate support member; 91B…intermediate support member; 91C…intermediate support member; 91D…intermediate support member; 91E…intermediate support member; 92…center opening; 93…recess; 94…rear support surface; 101…outer periphery; 102…inner periphery; 103…outer periphery mounting portion; 104…inner periphery mounting portion; 111…shaft; 112…spur gear; 113F ...rotor bearing; 114...driven gear; 115A...first intermediate gear; 115B...second intermediate gear; 115C...intermediate shaft; 116...intermediate bearing; 118...accommodation recess; 118A...radial support surface; 118B...front support surface; 119...front accommodation portion; 120...rear accommodation portion; 121...first accommodation chamber; 122...second accommodation chamber; 135...bevel gear; 139...bearing; CL...clearance; D1...inner diameter; D2...inner diameter; D3...depth; D4...thickness; FM...fixing member; W1...width; W2...width. DETAILED DESCRIPTION

[0042] In one or more embodiments, the power tool may include: a grip portion extending in the front-to-back direction; a motor housing portion arranged in front of the grip portion; a motor arranged inside the motor housing portion and having a stator and a rotor rotatable relative to the stator; a bevel gear rotating integrally with the rotor and having an axis extending in the front-to-back direction; a spindle rotating directly or indirectly with the aid of the bevel gear and extending in a direction intersecting the front-to-back direction; a front end tool holding portion rotating through the spindle; a housing accommodating the bevel gear and the spindle; and a bearing held in the housing and holding the bevel gear rotatable.

[0043] With this structure, the bearing that rotatably holds the bevel gear that rotates integrally with the rotor can be held in the housing together with the bevel gear. This eliminates the need for separate retaining components such as a housing or bracket dedicated to the bearing and the housing. Consequently, a dedicated bearing retaining component is unnecessary, thereby miniaturizing the gear unit of the power tool.

[0044] In one or more embodiments, the power tool may further include: a hammer rotated by a spindle; and an anvil on which the hammer strikes directly or indirectly in the direction of rotation. The tool holder may be disposed at the lower end of the anvil. The housing may house the bevel gear, spindle, and hammer.

[0045] With the above-described structure, it is possible to provide an impact tool capable of achieving miniaturization of the gear portion.

[0046] In one or more embodiments, the rotor may include a rotor shaft extending in a front-to-rear direction, the rotor shaft extending from the motor housing toward the interior space of the housing, and the bevel gear may be fixed to the rotor shaft.

[0047] In the above structure, a bevel gear is used as a pinion fixed to the rotor shaft. Furthermore, a bearing that rotatably holds the bevel gear can be used to support the rotor shaft. The same bearing can be used to support both the rotor shaft and the bevel gear.

[0048] In one or more embodiments, the bearing may be in contact with the rotor shaft and rotatably hold the bevel gear via the rotor shaft.

[0049] With the above configuration, the bevel gear does not need to be provided with a portion that is supported by contact with the bearing, and thus the bevel gear can be reduced in size.

[0050] In one or more embodiments, the housing may include a radial support surface for supporting radial loads acting on the bearings, and a front support surface for supporting forward thrust loads acting on the bearings. The motor housing and the housing may be connected in a front-to-rear direction. The motor housing may include a rear support surface for supporting rearward thrust loads acting on the bearings.

[0051] With this structure, the housing can support the radial load and forward thrust load associated with the transmission of the bevel gear's rotational force. The motor housing can also support the rearward thrust load associated with the transmission of the bevel gear's rotational force. The motor housing and housing can both hold the bearing and support the load.

[0052] In one or more embodiments, the power tool may further include an intermediate shaft disposed between the bevel gear and the main shaft and transmitting the rotation of the bevel gear to the main shaft. The intermediate shaft may be housed in the housing and extend in a direction intersecting the front-rear direction.

[0053] With the above structure, the rotation of the bevel gear can be decelerated by the intermediate shaft and transmitted to the main shaft. Compared with a case where the intermediate shaft is oriented in the front-back direction, the total length of the electric tool in the front-back direction can be shortened.

[0054] In one or more embodiments, the electric power tool may further include: a first intermediate shaft having a driven gear meshing with the bevel gear and reducing the rotation of the bevel gear; and a second intermediate shaft reducing the rotation of the first intermediate shaft and transmitting the reduced rotation to the main shaft.

[0055] The above structure can reduce the speed by multiple stages during the transmission of the rotation to the main shaft by the bevel gear, thereby obtaining a high torque suitable for the electric power tool.

[0056] In one or more embodiments, the major axis may extend in a direction orthogonal to the front-to-back direction.

[0057] With the above configuration, by providing the output shaft in a direction perpendicular to the front-rear direction, an angled power tool suitable for work in a narrow space can be obtained.

[0058] In one or more embodiments, the electric tool may include: a grip portion extending in the front-to-back direction; a motor housing portion arranged in front of the grip portion; a motor arranged inside the motor housing portion and having a stator and a rotor rotatable relative to the stator; a pinion rotating integrally with the rotor; a reduction mechanism portion connected to the pinion; a main shaft connected to the reduction mechanism portion and extending in a direction intersecting the front-to-back direction; a front end tool holding portion rotated by the main shaft; a housing that accommodates the pinion, the reduction mechanism portion and the main shaft; and a bearing held in the housing and holding the pinion rotatable.

[0059] With this structure, the bearing that rotatably holds the pinion gear that rotates integrally with the rotor can be held in the housing together with the pinion gear. This eliminates the need for separate retaining components such as a housing or bracket dedicated to the bearing and the housing. Consequently, a dedicated bearing retaining component is not required, thereby miniaturizing the gear unit of the power tool.

[0060] In one or more embodiments, the motor housing portion and the housing may be connected in a front-to-rear direction. The bearing may be sandwiched between the motor housing portion and the housing.

[0061] In the above structure, the bearing is sandwiched between the motor housing portion and the case, and therefore the bearing can be held without increasing the number of components.

[0062] In one or more embodiments, the housing may include a housing recessed from the rear portion of the housing toward the front for housing the bearing. The motor housing may include a support wall on the front surface of the motor housing for directly or indirectly supporting the rear surface of the bearing.

[0063] With the above structure, by providing the housing recess for housing the bearing in the housing, the housing can bear the radial load and forward thrust load acting on the bearing, and the motor housing can bear the rearward thrust load acting on the bearing.

[0064] In one or more embodiments, the speed reduction mechanism may include: a first speed reduction unit connected to the pinion gear and reducing the speed of the pinion gear; and a second speed reduction unit that reduces the speed of the first speed reduction unit and transmits the speed to the main shaft.

[0065] The above structure enables multi-stage speed reduction during the transmission of rotation to the main shaft, thereby achieving the high torque required for the electric power tool.

[0066] In one or more embodiments, the power tool may include: a grip portion extending in the front-to-back direction; a motor housing portion arranged in front of the grip portion; a motor arranged inside the motor housing portion and having a stator and a rotor rotatable relative to the stator; a bevel gear rotating directly or indirectly through the rotor and having an axis extending in the front-to-back direction; a spindle rotating directly or indirectly with the aid of the bevel gear and extending in a direction intersecting the front-to-back direction; a front end tool holding portion rotating through the spindle; a housing accommodating the bevel gear and the spindle; a bearing supported by the housing and holding the bevel gear rotatable; an intermediate support component having a front surface in contact with the bearing; and a fixing component in contact with the rear surface of the intermediate support component and fixing the intermediate support component together with the housing only by clamping.

[0067] Regarding the above structure, the bevel gear is supported by a bearing that can rotate and is supported by the housing, and the rear surface of the bearing is supported by an intermediate support member and a fixed member. Even when a thrust load is generated as the rotational force of the bevel gear is transmitted, the thrust load can be borne by the bearing and the housing or the fixed member. The intermediate support member in contact with the bearing is fixed by the housing and the fixed member by clamping, thereby preventing the generation of a gap (rocking) in the direction of the thrust load of the bearing. As a result, the bevel gear can be properly held in the angle power tool. In addition, the intermediate support member is fixed only by clamping, so there is no need to provide components such as screws to fix the intermediate support member. Therefore, the number of components can be reduced and the gear part can be miniaturized.

[0068] In one or more embodiments, either the intermediate support member or the fixing member can elastically deform the other.

[0069] The above-described structure can absorb dimensional tolerances by elastic deformation, and thus can reliably prevent the occurrence of play (play) in the direction in which the thrust load of the bearing acts.

[0070] In one or more embodiments, the bearing may include a ball bearing having an inner ring, an outer ring, and balls. The intermediate support member may be made of metal and contact the outer ring. The fixing member may be made of resin and sandwich the intermediate support member as it elastically deforms.

[0071] With this structure, the intermediate support member, which contacts the outer ring of the bearing, can be made of metal and bear the thrust load, while the fixing member can be made of resin and elastically deform. This achieves a structure that prevents play (play) in the direction of the bearing's thrust load and also withstands the concentrated load from the outer ring.

[0072] In one or more embodiments, the radial width of the rear surface of the intermediate support member may be greater than the radial width of the outer ring.

[0073] This structure allows the contact area between the rear surface of the intermediate support member and the fixing member to be larger than the contact area between the outer ring and the front surface of the intermediate support member. Therefore, when subjected to thrust loads from the outer ring, the intermediate support member can increase the contact area, thereby reducing the surface pressure acting on the resin fixing member.

[0074] In one or more embodiments, the intermediate support member may be made of resin, and the fixing member may be made of metal and sandwich the intermediate support member while elastically deforming the intermediate support member.

[0075] With the above-described structure, by using the intermediate support member as a spacer or a buffer, it is possible to prevent the occurrence of play (play) in the direction in which the thrust load of the bearing acts.

[0076] In one or more embodiments, the rotor may include a rotor shaft extending in a front-rear direction. The intermediate support member may be provided along the rear surface of the bearing to surround the rotor shaft and have a C-shape including one end and the other end.

[0077] With the above-described structure, the intermediate support member is formed into a C-shape, so that the intermediate support member can be assembled to the rotor shaft from the radial direction during assembly of the power tool. Therefore, even if the assembler mistakenly assembles the components in the wrong order, the intermediate support member can still be assembled from the rear, thereby improving assembly workability.

[0078] In one or more embodiments, the intermediate support member may have an annular shape that follows the rear surface of the bearing.

[0079] With the above-described structure, the intermediate support member having an annular shape can bear the thrust load over the entire circumference of the bearing.

[0080] In one or more embodiments, the fixing member may be integrally formed with the motor housing.

[0081] With the above configuration, compared to a case where the fixing member is provided as a member separate from the motor housing, the number of components can be reduced, and the gear portion can be miniaturized.

[0082] The following describes an embodiment with reference to the accompanying drawings. In the embodiment, the terms left, right, front, rear, top, and bottom are used to describe the positional relationship of each part. These terms represent relative positions or directions with respect to the center of the power tool.

[0083] [First embodiment]

[0084] Figure 1 It is a perspective view showing the electric tool 1 according to the embodiment. Figure 2 It is a side view showing the electric tool 1 according to the embodiment. Figure 3 It is a bottom view showing the electric power tool 1 according to the embodiment. Figure 4 It is a longitudinal sectional view showing the electric power tool 1 according to the embodiment. Figure 5 It is a longitudinal sectional view showing the motor housing portion 21 of the electric power tool 1 according to the embodiment. Figure 6 It is a longitudinal sectional view showing the housing 4 of the electric power tool 1 according to the embodiment. Figure 7 It is a cross-sectional view of the electric power tool 1 according to the embodiment, taken along the left-right direction of the anvil 10 .

[0085] In an embodiment, the power tool 1 is a power tool having an electric motor 6 as a power source. The direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as the axial direction, the direction around the rotation axis AX is appropriately referred to as the circumferential direction or the rotation direction, and the radial direction of the rotation axis AX is appropriately referred to as the radial direction. In addition, in the radial direction, the position closer to the rotation axis AX or the direction close to the rotation axis AX is appropriately referred to as the radial inner side or the inner peripheral side, and the position farther from the rotation axis AX or the direction away from the rotation axis AX is appropriately referred to as the radial outer side or the outer peripheral side. In an embodiment, the rotation axis AX extends in the front-to-back direction. One axial side is the front side (front), and the other axial side is the rear side (rear).

[0086] In the embodiment, a power tool 1 is an angled impact wrench. The power tool 1 includes a housing 2, a casing 4, a motor 6, a speed reduction mechanism 7, a spindle 8, a striking mechanism 9, an anvil 10, a fan 12, a battery assembly 13, a trigger shifter 14, a forward / reverse switching shifter 15, an operating panel 16, a light unit 17, and a controller 18.

[0087] The housing 2 is made of synthetic resin and is composed of a pair of left and right half-split housings. The pair of half-split housings are fixed by a plurality of screws 2S.

[0088] The housing 2 includes a motor housing portion 21 , a grip portion 22 , and a battery holding portion 23 .

[0089] The motor housing 21 forms the front portion of the housing 2. It is located in front of the grip 22. The motor housing 21 is cylindrical and houses the motor 6. The motor housing 21 also houses the motor 6, the fan 12, and the bearing 38R. The operation panel 16 is located on top of the motor housing 21.

[0090] The grip portion 22 extends in the front-to-back direction. The grip portion 22 extends rearward from the motor housing portion 21. The trigger shifter 14 is provided at the lower portion of the grip portion 22. The grip portion 22 is gripped by the operator.

[0091] The battery holding portion 23 is connected to the rear end of the grip portion 22 . The battery holding portion 23 accommodates the controller 18 . The battery holding portion 23 holds a battery pack 25 . The battery pack 25 is mounted on the battery mounting portion 13 provided on the lower surface of the battery holding portion 23 .

[0092] The motor housing 21 has an air inlet 19 and an air outlet 20. The air inlet 19 and the air outlet 20 are provided on the left and right side surfaces of the motor housing 21. Air outside the housing 2 flows into the interior of the housing 2 through the air inlet 19. Air inside the housing 2 flows out to the exterior of the housing 2 through the air outlet 20.

[0093] The housing 2 and the casing 4 are aligned in the front-to-back direction. The motor housing portion 21 and the casing 4 are connected in the front-to-back direction. The front portion of the housing 2 and the rear portion of the casing 4 are connected. The housing 2 and the casing 4 are fixed by screws 70.

[0094] The housing 4 is connected to the front portion of the motor housing 21. The motor housing 21 is fixed to the rear portion of the housing 4. A housing flange 21F is provided at the front end of the motor housing 21. A housing flange 4F having a plurality of bosses 4H is provided at the rear end of the housing 4. Screws 70 are inserted through screw insertion holes in the housing flange 21F and engage with the bosses 4H to secure the housing 4 to the motor housing 21.

[0095] The housing 4 houses the bevel gear 35 serving as a pinion gear. The housing 4 houses the speed reduction mechanism 7. The housing 4 houses the main shaft 8. The housing 4 houses the striking mechanism 9 including the hammer 47. The housing 4 houses a portion of the anvil 10. The housing 4 is made of metal. In the embodiment, the housing 4 is made of aluminum. The housing 4 is hollow and box-shaped.

[0096] The housing 4 includes a housing body 4A and a cover 4B. The housing body 4A is in the shape of a hollow box with openings on the rear and upper surfaces. The rear surface of the housing body 4A is connected to the motor housing portion 21 of the housing 2 and is covered by the motor housing portion 21. The upper surface of the housing body 4A is covered by the cover 4B. The cover 4B is set from the front end in the upper surface of the housing body 4A to the near front side of the rear end and is fixed to the housing body 4A by screws 4S. The housing 4 is assembled with the reduction mechanism portion 7, the main shaft 8, the striking mechanism 9 and the anvil 10 from the upper surface opening of the housing body 4A, and the cover 4B is assembled to the housing body 4A to accommodate the above-mentioned parts.

[0097] The housing 4 has a front surface, left and right side surfaces, and a bottom surface formed by a housing body 4A. Figure 7 As shown, the lower surface of the shell 4 has a flat loading surface 81 and a cylindrical portion 82 protruding downward from the loading surface 81. The loading surface 81 is a surface along the front-back direction and the left-right direction. The loading surface 81 connects the front surface and the left and right side surfaces of the shell body 4A and the cylindrical portion 82. The lamp unit 17 and the lampshade 60 are arranged on the loading surface 81. The loading surface 81 is covered by the lampshade 60. The cylindrical portion 82 is located near the front surface in the lower surface of the shell 4. The cylindrical portion 82 has a cylindrical shape. The internal opening of the cylindrical portion 82 is connected to the interior of the shell 4. The anvil 10 passes through the cylindrical portion 82. The anvil 10 protrudes downward from the interior of the shell 4 through the cylindrical portion 82.

[0098] The housing 4 holds a bearing 38F that rotatably supports the rotor 27 of the motor 6. The speed reduction mechanism 7 is disposed in front of the bearing 38F. The spindle 8 and the striking mechanism 9 are disposed in front of the speed reduction mechanism 7. The anvil 10 is disposed below the striking mechanism 9.

[0099] The motor 6 is the power source of the power tool 1. The motor 6 generates rotational force. The motor 6 is an electric motor. The motor 6 is an inner rotor type brushless motor. The motor 6 is housed in the motor housing portion 21 of the housing 2. The motor 6 is disposed inside the motor housing portion 21.

[0100] like Figure 5 As shown, the motor 6 includes a stator 26 and a rotor 27 rotatable relative to the stator 26. The stator 26 is supported by the motor housing 21. At least a portion of the rotor 27 is disposed inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates about a rotation axis AX extending in the front-rear direction.

[0101] The stator 26 includes a stator core 28 , a front insulator 29 , a rear insulator 30 , and a coil 31 .

[0102] The stator core 28 is arranged radially outward from the rotor 27. The stator core 28 is composed of a plurality of stacked steel plates. A steel plate is a metal plate primarily composed of iron. The stator core 28 is cylindrical and has a plurality of teeth that support the coils 31.

[0103] Front insulator 29 is provided at the front of stator core 28. Rear insulator 30 is provided at the rear of stator core 28. Front insulator 29 and rear insulator 30 are each electrically insulating components made of synthetic resin. Front insulator 29 is positioned to partially cover the surface of the teeth. Rear insulator 30 is positioned to partially cover the surface of the teeth.

[0104] Coil 31 is mounted on stator core 28 via front insulator 29 and rear insulator 30. Multiple coils 31 are provided. Coil 31 is arranged around the teeth of stator core 28 via front insulator 29 and rear insulator 30. Front insulator 29 and rear insulator 30 electrically insulate coil 31 from stator core 28.

[0105] The rotor 27 rotates around the rotation axis AX and includes a rotor core portion 32 , a rotor shaft portion 33 , and a rotor magnet 34 .

[0106] The rotor core 32 and rotor shaft 33 are each made of steel. In the embodiment, the rotor core 32 and rotor shaft 33 are separate structures. The rotor core 32 and rotor shaft 33 can also be formed integrally. The front portion of the rotor shaft 33 protrudes forward from the front end of the rotor core 32. The rear portion of the rotor shaft 33 protrudes rearward from the rear end of the rotor core 32.

[0107] The rotor magnet 34 is fixed to the rotor core portion 32. The rotor magnet 34 extends in the front-rear direction so as to penetrate the rotor core portion 32.

[0108] The sensor substrate 37 is attached to the rear insulator 30. The sensor substrate 37 includes an annular circuit board and a magnetic sensor supported by the circuit board. At least a portion of the sensor substrate 37 faces the rotor magnet 34. The magnetic sensor detects the magnetic force of the rotor magnet 34 to detect the position of the rotor 27 in the rotational direction.

[0109] The rotor shaft 33 extends from the motor housing 21 into the interior of the case 4. The rear portion of the rotor shaft 33 is rotatably supported by a bearing 38R. The front portion of the bearing 38R is rotatably supported by a bearing 38F. The bearing 38R is retained by the case 2. The bearing 38R is housed in a recessed rear retaining portion 21A provided in the motor housing 21. The bearing 38F is housed in a recessed receiving portion 85 provided in the rear portion of the case 4. The front end of the rotor shaft 33 is disposed within the interior of the case 4 via an opening in the front surface of the motor housing 21 and an opening in the rear portion of the case 4.

[0110] The bevel gear 35 is provided at the front end of the rotor shaft 33. The bevel gear 35 is a small gear that rotates integrally with the rotor 27. The bevel gear 35 is connected to at least a portion of the speed reduction mechanism 7. The rotor shaft 33 is connected to the speed reduction mechanism 7 via the bevel gear 35.

[0111] like Figure 6 As shown, the reduction mechanism portion 7 is connected to the bevel gear 35 serving as a pinion gear. The reduction mechanism portion 7 transmits the rotational force of the motor 6 to the main shaft 8 and the anvil 10. The reduction mechanism portion 7 is housed in the housing 4. The reduction mechanism portion 7 has a plurality of gears. The reduction mechanism portion 7 is arranged further forward than the motor 6. The reduction mechanism portion 7 is arranged further forward than the housing recess 85. The reduction mechanism portion 7 connects the rotor shaft portion 33 and the main shaft 8. The gears of the reduction mechanism portion 7 are driven by the rotor 27. The reduction mechanism portion 7 transmits the rotation of the rotor 27 to the main shaft 8. The reduction mechanism portion 7 rotates the main shaft 8 at a rotation speed lower than the rotation speed of the rotor shaft portion 33.

[0112] The speed reduction mechanism 7 is composed of a multi-stage speed reduction unit. The speed reduction mechanism 7 includes a first speed reduction unit 41 and a second speed reduction unit 42. The first speed reduction unit 41 is connected to the pinion gear and rotates the pinion gear by reducing the speed of the pinion gear.

[0113] The second speed reduction portion 42 reduces the speed of the rotation of the first speed reduction portion 41 and transmits the reduced speed to the main shaft 8 .

[0114] The first reduction gear 41 includes a driven gear 41A, a first intermediate gear 41B, and a first intermediate shaft 41C. The first intermediate shaft 41C extends in a direction intersecting the rotation axis AX. The first intermediate shaft 41C extends in a vertical direction perpendicular to the rotation axis AX and rotates about its vertical center axis. The first intermediate shaft 41C is rotatably supported at both ends by intermediate bearings 41D. The intermediate bearings 41D are retained by the housing 4. The intermediate bearings 41D are ball bearings. The driven gear 41A and the first intermediate gear 41B are fixed to the first intermediate shaft 41C. In this embodiment, the first intermediate gear 41B and the first intermediate shaft 41C are integrally formed. However, the first intermediate gear 41B and the first intermediate shaft 41C may be separate components. The driven gear 41A is attached to the lower portion of the first intermediate shaft 41C, while the first intermediate gear 41B is attached to the upper portion of the first intermediate shaft 41C. The driven gear 41A, the first intermediate gear 41B, and the first intermediate shaft 41C rotate integrally. The driven gear 41A is a bevel gear that meshes with the bevel gear 35 serving as a pinion gear. The first intermediate gear 41B is a spur gear that meshes with the second intermediate gear 42A of the second speed reduction unit 42 .

[0115] The second reduction gear 42 is positioned forward of the first reduction gear 41. It includes a second intermediate gear 42A and a second intermediate shaft 42B. The second intermediate shaft 42B extends in a direction intersecting the rotation axis AX. It extends in a vertical direction perpendicular to the rotation axis AX and rotates about its vertical center axis. The first intermediate shaft 41C and the second intermediate shaft 42B are parallel. Both ends of the second intermediate shaft 42B are rotatably supported by intermediate bearings 42C. The intermediate bearings 42C are held in the housing 4. Intermediate bearings 42C are sliding bearings. The second intermediate gear 42A is fixed to the second intermediate shaft 42B. The second intermediate gear 42A is attached to the upper portion of the second intermediate shaft 42B. The second intermediate gear 42A rotates integrally with the second intermediate shaft 42B. The second intermediate gear 42A is a spur gear. It meshes with the first intermediate gear 41B. The second intermediate gear 42A rotates by reducing the rotation of the first intermediate gear 41B. The second intermediate gear 42A meshes with the main shaft gear 8C of the main shaft 8. The spindle gear 8C rotates integrally with the spindle 8. The spindle gear 8C is a spur gear. Thus, the power tool 1 includes intermediate shafts (first intermediate shaft 41C and second intermediate shaft 42B) disposed between the bevel gear 35 and the spindle 8 and transmitting the rotation of the bevel gear 35 to the spindle 8. The intermediate shafts (first intermediate shaft 41C and second intermediate shaft 42B) are housed in the housing 4 and extend in a direction intersecting the front-to-back direction.

[0116] When the motor 6 is driven to rotate the rotor shaft 33, the bevel gear 35 rotates, which in turn rotates the driven gear 41A. The rotation of the driven gear 41A causes the first intermediate shaft 41C to rotate at a speed lower than the rotation speed of the rotor shaft 33. The rotation of the first intermediate shaft 41C causes the first intermediate gear 41B to rotate, which in turn causes the second intermediate gear 42A to rotate. The rotation of the second intermediate gear 42A causes the second intermediate gear 42A to rotate at a speed lower than the rotation speed of the first intermediate shaft 41C. The second intermediate gear 42A rotates the main shaft gear 8C. The main shaft gear 8C rotates at a speed lower than the rotation speed of the second intermediate gear 42A. The main shaft 8 rotates in conjunction with the rotation of the main shaft gear 8C. The main shaft 8 rotates at a speed lower than the rotation speed of the rotor shaft 33.

[0117] The main shaft 8 is connected to the speed reduction mechanism 7. The main shaft 8 is rotated by the motor 6. The main shaft 8 is arranged in front of the motor 6. The main shaft 8 is arranged in front of the stator 26. The main shaft 8 is arranged in front of the rotor 27. At least a portion of the main shaft 8 is arranged in front of the speed reduction mechanism 7. The main shaft 8 is rotated by the rotor 27. The main shaft 8 rotates by the rotational force of the rotor 27 transmitted by the speed reduction mechanism 7.

[0118] The spindle 8 extends in a direction intersecting the front-to-back direction. The spindle 8 extends downward along a rotation axis BX perpendicular to the front-to-back direction. The spindle 8 rotates around the rotation axis BX. The rotation axis BX of the spindle 8 and the rotation axis AX of the motor 6 are not parallel but intersect with each other. The direction of the rotation axis BX of the spindle 8 can intersect with the front-to-back direction (i.e., the rotation axis AX) at any angle of 80 degrees or more and 100 degrees or less. In the embodiment, the spindle 8, the hammer 47, and the anvil 10 are arranged along the rotation axis BX and rotate around the rotation axis BX.

[0119] The main shaft 8 includes a flange portion 8A and a main shaft portion 8B that projects downward from the flange portion 8A. A main shaft gear 8C is provided on the outer periphery of the flange portion 8A.

[0120] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is retained by the housing 4. The spindle 8 has a cylindrical portion 8D protruding upward from the upper portion of the flange portion 8A. The spindle bearing 44 is arranged on the outer periphery of the cylindrical portion 8D. The spindle bearing 44 supports the outer periphery of the cylindrical portion 8D so as to be rotatable. The spindle bearing 44 is a sliding bearing. A cylindrical protrusion protruding downward is provided at the lower end portion of the spindle shaft portion 8B. The protrusion is arranged in an anvil recess 10C formed on the upper surface of the anvil 10. The lower portion of the spindle 8 is rotatably supported by the anvil bearing 46 via the anvil 10.

[0121] The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the speed reduction mechanism 7 and the main shaft 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the main shaft 8 rotated by the motor 6. Figure 6 and Figure 7 As shown, the striking mechanism 9 includes a hammer 47, a ball 48, and a coil spring 49. The striking mechanism 9 including the hammer 47 is housed in the housing 4. The striking mechanism 9 is disposed between the spindle 8 and the anvil 10 in the housing 4. The striking mechanism 9 is disposed below the flange portion 8A of the spindle 8.

[0122] Hammer 47 is positioned forward of speed reduction mechanism 7. Hammer 47 is housed in housing 4. Main shaft 8 rotates hammer 47. Hammer 47 is positioned around main shaft portion 8B. Hammer 47 is retained by main shaft portion 8B. Ball 48 is positioned between main shaft portion 8B and hammer 47. Coil spring 49 is supported by flange portion 8A and hammer 47, respectively.

[0123] The hammer 47 has a main body 47D, a hammer groove 47A, and a hammer protrusion 47B (see Figure 7The main body 47D is arranged around the spindle shaft 8B. The main body 47D is annular. A recess 47C is provided at the rear of the main body 47D. The recess 47C is recessed forward from the rear end of the main body 47D. The recess 47C is annular. The hammer protrusion 47B protrudes forward from the main body 47D. Two hammer protrusions 47B are provided.

[0124] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the speed reduction mechanism 7 and the main shaft 8. The hammer 47 can rotate together with the main shaft 8 based on the rotational force of the main shaft 8 rotated by the motor 6. The rotation axis of the hammer 47 coincides with the rotation axis BX of the main shaft 8. The hammer 47 rotates around the rotation axis BX.

[0125] Ball 48 is made of a metal such as steel. Ball 48 is positioned between spindle shaft portion 8B and hammer 47. Spindle 8 has a spindle groove 8F in which at least a portion of ball 48 is positioned. Spindle groove 8F is provided on a portion of the outer circumferential surface of spindle shaft portion 8B. Hammer 47 has a hammer groove 47A in which at least a portion of ball 48 is positioned. Hammer groove 47A is provided on a portion of the inner surface of main body portion 47D. Ball 48 is positioned between spindle groove 8F and hammer groove 47A. Ball 48 can roll inside spindle groove 8F and inside hammer groove 47A, respectively. Hammer 47 can move with ball 48. Spindle 8 and hammer 47 can move relative to each other in the axial and rotational directions within the movable ranges defined by spindle groove 8F and hammer groove 47A, respectively.

[0126] Coil spring 49 generates a spring force that moves hammer 47 downward. Coil spring 49 is positioned between flange 8A and hammer 47. The lower portion of coil spring 49 is positioned within an annular recess 47C provided on the rear surface of hammer 47. A washer 45 is positioned within recess 47C. Washer 45 is supported on body 47D via balls 50. The upper end of coil spring 49 is supported by flange 8A. The lower end of coil spring 49 is supported by washer 45. The hammer 47 and coil spring 49 are relatively rotatable about rotation axis BX by interposing washer 45 and balls 50.

[0127] The anvil 10 is the output portion of the power tool 1. The anvil 10 is rotated by the rotational force of the motor 6. At least a portion of the anvil 10 is positioned below the hammer 47. The anvil 10 is struck directly or indirectly in the direction of rotation by the hammer 47. In the embodiment, the anvil 10 is struck directly by the hammer 47.

[0128] The anvil 10 has a rod-shaped anvil shaft portion 10A and an anvil protrusion 10B. An anvil recess 10C that accommodates the protrusion of the spindle shaft portion 8B is provided at the upper end of the anvil 10. The anvil protrusion 10B is provided at the upper end of the anvil 10. The anvil protrusion 10B protrudes radially outward from the upper end of the anvil shaft portion 10A. The anvil shaft portion 10A protrudes downward from the interior of the housing 4 through the cylindrical portion 82 toward the outside of the housing 4. The lower end of the anvil shaft portion 10A is exposed outside the housing 4. The front end tool holder 51 is arranged at the lower end of the anvil 10. The front end tool holder 51 is provided at the exposed portion of the lower end of the anvil shaft portion 10A. The front end tool holder 51 is rotated by the spindle 8. In an embodiment, the hammer 47 rotated by the spindle 8 strikes the anvil 10 in the rotational direction, thereby causing the front end tool holder 51 to rotate integrally with the anvil 10.

[0129] In the impact wrench according to the embodiment, the tool tip holding portion 51 is a quadrangular prism-shaped engaging portion that engages with an engaging recess of a socket serving as a tool tip. The socket is held in a state of being fitted with the tool tip holding portion 51 .

[0130] The anvil 10 is rotatably supported by anvil bearings 46 (see Figure 7 ). The rotation axis of the anvil 10 is consistent with the rotation axis BX of the main shaft 8. The anvil 10 rotates around the rotation axis BX. The anvil bearing 46 is arranged on the inner side of the cylindrical portion 82. The anvil bearing 46 is arranged on the inner side of the cylindrical portion 82 of the housing 4. The anvil bearing 46 is retained by the cylindrical portion 82. The cylindrical portion 82 is arranged around the anvil shaft portion 10A. The anvil bearing 46 supports the anvil shaft portion 10A so as to be rotatable. In an embodiment, the anvil bearing 46 is a sliding bearing. An anvil shaft portion 10A is provided with an anvil groove 46A opposite to the anvil bearing 46. An annular sealing member 46B is arranged in the groove 46A. In addition, a gasket 52 is provided on the inner bottom surface of the housing 4. The gasket 52 is opposite to the anvil protrusion 10B.

[0131] The hammer protrusion 47B can contact the anvil protrusion 10B. In a state where the hammer protrusion 47B and the anvil protrusion 10B are in contact, the motor 6 is driven to rotate the anvil 10, the hammer 47, and the spindle 8 together.

[0132] The anvil 10 is struck in the rotational direction by the hammer 47. For example, during a screw tightening operation, if the load acting on the anvil 10 increases, the power generated by the motor 6 alone may not be enough to rotate the anvil 10. If the power generated by the motor 6 alone is insufficient to rotate the anvil 10, the anvil 10 and the hammer 47 stop rotating. The spindle 8 and the hammer 47 are able to move relative to each other in the axial and circumferential directions via the ball bearings 48. Even after the hammer 47 stops rotating, the spindle 8 continues to rotate due to the power generated by the motor 6. While the hammer 47 is stopped, if the spindle 8 rotates, the ball bearings 48 move upward while being guided by the spindle grooves 8F and hammer grooves 47A, respectively. The hammer 47 receives force from the ball bearings 48 and moves upward along with them. In other words, while the anvil 10 is stopped, the spindle 8 rotates, causing the hammer 47 to move upward. The upward movement of the hammer 47 releases the contact between the hammer protrusion 47B and the anvil protrusion 10B.

[0133] The coil spring 49 generates an elastic force that causes the hammer 47 to move downward. The hammer 47, which is moving upward, moves downward with the help of the elastic force of the coil spring 49. When moving downward, the hammer 47 receives a force in the rotational direction from the ball 48. That is, the hammer 47 moves downward while rotating. If the hammer 47 moves downward while rotating, the hammer protrusion 47B contacts the anvil protrusion 10B while rotating. As a result, the anvil protrusion 10B is struck by the hammer protrusion 47B in the rotational direction. Both the power of the motor 6 and the inertia force of the hammer 47 act on the anvil 10. Therefore, the anvil 10 can rotate around the rotation axis BX with a high torque.

[0134] The fan 12 is rotated by the rotational force of the motor 6. Figure 5 As shown, the fan 12 is arranged further forward than the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the front portion of the rotor shaft 33. The fan 12 is arranged between the bearing 38F and the stator 26. The fan 12 rotates due to the rotation of the rotor 27. The rotor shaft 33 rotates, causing the fan 12 to rotate together with the rotor shaft 33. The rotation of the fan 12 causes air from the external space of the housing 2 to flow into the internal space of the housing 2 through the air inlet 19. The air flowing into the internal space of the housing 2 circulates in the internal space of the housing 2 and cools the motor 6. The air circulating in the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 20 due to the rotation of the fan 12.

[0135] like Figure 1 and Figure 5As shown, the operation panel 16 is provided on the motor housing 21. The operation panel 16 is exposed to the outside through a panel opening 21B formed in the upper surface of the motor housing 21. The operation panel 16 is located near the boundary with the grip 22 at the rear of the motor housing 21. The operation panel 16 is located forward of the trigger paddle 14. At least a portion of the operation panel 16 vertically overlaps the motor 6. At least a portion of the operation panel 16 vertically overlaps the bearing 38R.

[0136] Figure 8 1 is a perspective view showing the operation panel 16 according to the embodiment. Figure 8 , the right side of the housing 2 is partially removed, exposing a portion of the operation panel 16. The operation panel 16 is plate-shaped. It includes operation buttons 16A, an indicator display 16B, and a circuit board 16C. The operation buttons 16A and indicator display 16B are secured to the circuit board 16C via a frame-shaped bracket 16D. The bracket 16D fits into the panel opening 21B. The circuit board 16C is provided with the operation buttons 16A and indicator display 16B and is connected to the controller 18 via wiring. The motor housing 21 has a retaining groove 21C directly below the panel opening 21B to support the outer periphery of the circuit board 16C. The operation panel 16 is retained in the motor housing 21 by the outer periphery of the circuit board 16C fitting into the retaining groove 21C. The operation panel 16 outputs signals to the controller 18 in response to inputs from the operation buttons 16A and displays information on the indicator display 16B based on the signals from the controller 18.

[0137] When the operator operates the operation button 16A, the controller 18 switches the operation mode of the motor 6. The indicator display 16B includes a light-emitting element. The light-emitting element is, for example, an LED light-emitting element. The indicator display 16B displays the operation mode of the motor 6 by changing the lighting pattern of the multiple light-emitting elements. The operation modes include, for example, three operation modes in which the rotation speed of the motor 6 is set to different levels: strong, medium, and weak; a mode in which the motor 6 is stopped based on the detection of the start of the strike by the striking mechanism 9; and a mode in which the motor 6 is switched to a stopped or low-speed rotation based on the detection of the rotation of the nut when loosening a nut.

[0138] Figure 9 Schematic diagram showing the assembly of the battery pack 25 to the battery holding portion 23 according to the embodiment. Figure 9 , the right side of the housing 2 is partially removed to expose the inside of the battery holding portion 23. Figure 4 and Figure 9As shown, the battery assembly portion 13 is arranged below the battery retaining portion 23. The battery pack 25 is mounted on the battery assembly portion 13. The battery pack 25 can be attached to and detached from the battery assembly portion 13. The battery assembly portion 13 holds the battery pack 25 so that it can slide in the front-to-back direction. When the battery pack 25 slides from the rear of the battery assembly portion 13 toward the front and reaches the engaged position, the battery assembly portion 13 engages with the engaging hook 25A of the battery pack 25, restricting the backward sliding movement of the battery pack 25. The battery pack 25 is provided with a release button that moves the engaging hook 25A forward and backward in the vertical direction. When the release button is pressed, the engaging hook 25A moves downward and backward, releasing the engagement with the battery assembly portion 13. This allows the battery pack 25 to be attached and detached.

[0139] The battery pack 25 functions as a power source for the power tool 1. The battery pack 25 includes a secondary battery. In the embodiment, the battery pack 25 includes a rechargeable lithium-ion battery. The battery pack 25 is mounted in the battery mounting portion 13 to supply power to the power tool 1. The motor 6 and the lamp unit 17 are each driven by the power supplied by the battery pack 25.

[0140] The controller 18 operates based on the electric power supplied from the battery pack 25 .

[0141] The controller 18 outputs a control signal for controlling the motor 6. The controller 18 includes a circuit substrate on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit substrate include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or a storage, a volatile memory such as a RAM (Random Access Memory), a field effect transistor (FET), and a resistor. The controller 18 sets the operation mode of the electric tool 1 based on the operation of the operation panel 16. The setting parameters of the operation mode of the electric tool 1 include the current threshold of the motor 6, the on / off control conditions, and the like. The controller 18 outputs a signal for displaying the setting state of the operation mode to the operation panel 16.

[0142] The controller 18 is housed in the battery holding portion 23. The controller 18 is positioned above the battery mounting portion 13. The controller 18 extends in the front-to-back and left-to-right directions. The controller 18 is positioned so as to overlap the upper surface of the battery mounting portion 13. The battery holding portion 23 has a dome-shaped outer shape, forming a space for housing the controller 18.

[0143] like Figure 4As shown, the trigger paddle 14 is provided on the grip 22. The trigger paddle 14 is operated by the operator to start the motor 6. The switch body 14A is disposed above the trigger paddle 14. The switch body 14A is disposed within the grip 22. Operating the trigger paddle 14 operates the switch body 14A. Operating the switch body 14A generates a trigger signal. Based on the trigger signal, the controller 18 switches between driving and stopping the motor 6.

[0144] The forward / reverse switching lever 15 is provided on the grip 22. It is located above the trigger lever 14 on the left and right sides of the grip 22. The forward / reverse switching lever 15 is operated by the operator. Operating the forward / reverse switching lever 15 switches the rotational direction of the motor 6 from one of the forward and reverse directions to the other. Switching the rotational direction of the motor 6 also switches the rotational direction of the spindle 8.

[0145] The lamp unit 17 emits illumination light. The lamp unit 17 illuminates the anvil 10 and the surroundings of the anvil 10 with the illumination light. The lamp unit 17 includes one or more light emitters 53. The lamp unit 17 includes chip onboard light emitting diodes (COB LEDs).

[0146] (Lamp unit)

[0147] Figure 10 1 is a longitudinal sectional view taken along the front-rear direction showing the lamp unit 17 according to the embodiment. Figure 11 It is an exploded perspective view showing the structure of the lamp unit 17 according to the embodiment. Figure 12 This is a perspective view showing the front portion of the electric power tool according to the embodiment as viewed from below. Figure 13 This is an exploded perspective view showing the assembly of the lamp cover to the hammer housing according to the embodiment as viewed from below. Figure 14 It is a perspective view showing a hammer case according to the embodiment as viewed from below. Figure 15 This is a bottom view of the hammer housing with the lamp cover removed. Figure 16 It is a perspective view showing a lampshade.

[0148] The lamp unit 17 is arranged on the lower surface of the housing 4. The lamp unit 17 is arranged around the cylindrical portion 82. The lamp unit 17 is arranged around the anvil 10 via the cylindrical portion 82. In the embodiment, the lamp unit 17 has an annular shape surrounding the anvil 10.

[0149] The lamp unit 17 includes a plurality of light emitting bodies 53. The light emitting bodies 53 are LED (light emitting diodes) elements. The lamp unit 17 has a substrate 54 on which the plurality of light emitting bodies 53 are provided.

[0150] The light-emitting body 53 is held by the housing 4. The light-emitting body 53 is held by the lower surface of the housing 4. A plurality of light-emitting bodies 53 are provided around the anvil 10. The plurality of light-emitting bodies 53 are arranged along the circumference of the anvil 10. The plurality of light-emitting bodies 53 are arranged in the rotation direction around the anvil 10. The light-emitting body 53 is arranged in at least a portion around the anvil shaft portion 10A. The plurality of light-emitting bodies 53 are arranged along the rotation direction of the anvil 10. The light-emitting body 53 is mounted on the lower surface of the substrate 54.

[0151] Examples of the substrate 54 include an aluminum substrate, a glass cloth-based epoxy resin substrate (FR-4 substrate), or a composite-based epoxy resin substrate (CEM-3 substrate). The light-emitting body 53 is mounted on the surface of the substrate 54. The light-emitting body 53 and the substrate 54 are connected by metal wires (not shown). The metal wires connect the multiple light-emitting bodies 53 to each other. The multiple light-emitting bodies 53 are surrounded by a dam 55. The phosphor 56 is arranged in the space surrounded by the dam 55. The light-emitting body 53 is covered by the phosphor 56. A pair of electrodes (not shown) are arranged on the front surface (front surface) or the back surface (rear surface) of the substrate 54 outside the dam. One of the pair of electrodes is a positive electrode, and the other is a negative electrode. Wires 65 are connected to each of the pair of electrodes. Electric power output from the battery pack 25 is supplied to the electrodes via the wires 65. The electric power supplied to the electrodes is supplied to the light-emitting body 53 via the substrate 54 and the metal wires. The light-emitting body 53 emits light based on the electric power supplied from the battery pack 25. The lamp unit 17 and the controller 18 are connected via a wire 65 .

[0152] The substrate 54 has a circular ring shape surrounding the cylindrical portion 82. A plurality of light emitters 53 are arranged at intervals in the circumferential direction of the substrate 54. The number of light emitters 53 is not limited as long as it is a plurality. In the embodiment, 12 light emitters 53 are arranged at equal intervals in the circumferential direction of the cylindrical portion 82 (see FIG. Figure 11 ).

[0153] The lamp unit 17 includes an optical component 57 .

[0154] The optical component 57 is connected to the lamp unit 17. The optical component 57 is made of polycarbonate resin. In the embodiment, the optical component 57 is made of polycarbonate resin containing a white diffusing material. The optical component 57 is milky white. The optical component 57 transmits at least a portion of the light emitted from the lamp unit 17. The light transmittance of the optical component 57 is, for example, 40% to 70%. The optical component 57 diffuses the light emitted by the multiple light emitters 53.

[0155] The optical component 57 is arranged to cover the front sides of the plurality of light emitters 53. At least a portion of the optical component 57 is arranged further forward than the lamp unit 17. The optical component 57 is continuous, spanning the plurality of light emitters 53. The optical component 57 is formed into a ring shape that surrounds the anvil 10, covering the plurality of light emitters 53. The optical component 57 is annular. The optical component 57 includes an outer cylindrical portion 57A, an inner cylindrical portion 57B, a light-transmitting portion 57C, and a convex portion 57D.

[0156] like Figure 10 As shown, the outer cylinder portion 57A is configured to be radially outward than the inner cylinder portion 57B. In the radial direction, the plurality of light-emitting bodies 53 are configured between the outer cylinder portion 57A and the inner cylinder portion 57B. The inner cylinder portion 57B is configured to be radially outward than the cylindrical portion 82 of the housing 4. The light-transmitting portion 57C is configured to be lower than the plurality of light-emitting bodies 53. The light-transmitting portion 57C is annular. The light-transmitting portion 57C is configured to connect the front end portion of the outer cylinder portion 57A and the front end portion of the inner cylinder portion 57B. The light-transmitting portion 57C is opposite to the lower surface of the substrate 54. The light-transmitting portion 57C is opposite to the light-emitting body 53. The light emitted from the light-emitting body 53 passes through the light-transmitting portion 57C and irradiates the lower side of the lamp unit 17. The lower surface of the light-transmitting portion 57C constitutes the light emitting surface of the lamp unit 17.

[0157] The convex portion 57D is arranged to be positioned further rearward than the light transmitting portion 57C. The convex portion 57D is provided to protrude rearward from the rear portion of the outer tube portion 57A. The convex portion 57D is arranged on a pair of guide protrusions 83 (see FIG. Figure 14 、 Figure 15 ) and functions as a positioning portion of the lamp unit 17 in the rotational direction.

[0158] like Figure 10 As shown, the upper surface of substrate 54 is positioned below the upper ends of outer cylindrical portion 57A and inner cylindrical portion 57B. Substrate 54 and multiple light-emitting elements 53 are positioned within a concave housing space defined by outer cylindrical portion 57A, inner cylindrical portion 57B, and light-transmitting portion 57C of optical component 57. The upper surface of the housing space is open. Molding resin 58 fills the housing space. Molding resin 58 secures multiple light-emitting elements 53, substrate 54, optical component 57, and a portion of lead wire 65 to one another.

[0159] The housing 4 holds the lamp unit 17. The lamp unit 17 including a plurality of light emitters 53 is held on the lower surface of the housing 4. The electric tool 1 includes a lamp cover 60 disposed on the lower surface of the housing 4, holding the light emitters 53 and covering the lead wires 65.

[0160] (lampshade)

[0161] like Figure 12 and Figure 13As shown, the lampshade 60 is a separate structure from the motor housing 21. The lampshade 60 is a separate structure from the housing 4. The lampshade 60 engages with the motor housing 21. The lampshade 60 is mounted on the lower surface of the housing 4. The lampshade 60 holds the lamp unit 17 on the lower surface of the housing 4. The lamp unit 17 is held between the lower surface of the housing 4 and the lampshade 60. The lampshade 60 is made of, for example, resin.

[0162] The lampshade 60 includes a light-emitting element holder 61 and a cover 62. The light-emitting element holder 61 and the cover 62 are integrally formed into a single component. The light-emitting element holder 61 and the motor housing 21 are separate components. The cover 62 is separate components from the motor housing 21. The light-emitting element holder 61 is separate components from the housing 4. The cover 62 is separate components from the housing 4.

[0163] The illuminator holder 61 is disposed on the lower surface of the housing 4 and holds the plurality of illuminators 53. The illuminators 53 and the illuminator holder 61 are disposed on the mounting surface 81. The illuminator holder 61 is disposed in a surrounding pattern along the outer periphery of the optical component 57. The illuminator holder 61 is annular, surrounding the outer periphery of the optical component 57. The illuminator holder 61 includes a peripheral wall portion 61A that surrounds the optical component 57. The peripheral wall portion 61A is annular. The peripheral wall portion 61A extends vertically from the mounting surface 81 of the housing 4 to the lower surface of the optical component 57. The illuminator holder 61 includes a locking portion 61B that protrudes radially inward from the lower end of the peripheral wall portion 61A. The locking portion 61B extends along the entire inner circumference of the peripheral wall portion 61A. The locking portion 61B is located below the lower surface of the optical component 57. The locking portion 61B contacts the lower surface of the optical component 57 from below. The locking portion 61B partially contacts the outer peripheral edge of the lower surface of the optical component 57 in a hooking manner. The locking portion 61B is located on the lower surface of the optical component 57 at a position on the outer peripheral side of the light-emitting body 53. The light-emitting body holding portion 61 supports the lower surface of the optical component 57 at the locking portion 61B. As described above, the lamp unit 17 including the optical component 57, the light-emitting body 53 and the substrate 54 is integrated using the molded resin 58. Therefore, the light-emitting body holding portion 61 supports the entire lamp unit 17 including the light-emitting body 53 from below by supporting the lower surface of the optical component 57. The light-emitting body holding portion 61 exposes the position directly below the light-emitting body 53 and the position on the inner peripheral side of the light-emitting body 53 on the lower surface of the optical component 57.

[0164] The light-emitting element holding portion 61 is fixed to the lower surface of the housing 4 by screws 60S. The screws 60S tighten the light-emitting element holding portion 61 toward the lower surface of the housing 4. The light-emitting element holding portion 61 presses the lower surface of the optical component 57 toward the housing 4 using the locking portion 61B, thereby holding the plurality of light-emitting elements 53. The light-emitting element holding portion 61 presses the outer peripheral edge of the lower surface of the optical component 57.

[0165] The light-emitting element retaining portion 61 is secured to the lower surface of the housing 4, surrounding the optical component 57, with screws 60S at multiple locations. The light-emitting element retaining portion 61 is secured to the housing 4 at the four corners of the lower surface with four screws 60S. Screw holes 81A are formed in the flat mounting surface 81 of the lower surface of the housing 4. The screw holes 81A are located at the four corners surrounding the cylindrical portion 82. In other words, the four screw holes 81A are spaced approximately 90 degrees apart in the rotational direction of the cylindrical portion 82. The peripheral wall portion 61A includes bosses 61H for mounting the screws 60S. The bosses 61H are located at the four corners surrounding the cylindrical portion 82, corresponding to the screw holes 81A on the mounting surface 81. The bosses 61H have insertion holes for the screws 60S to pass through. The screws 60S are secured to the screw holes 81A by passing through the insertion holes of the bosses 61H from below. The light-emitting body holding portion 61 presses the optical component 57 upward from the four corners of the optical component 57 toward the placement surface 81 by the axial force of the screw 60S.

[0166] like Figure 10 As shown, the electric tool 1 further includes a buffer member 59 disposed between the light-emitting body 53 and the lower surface of the housing 4. The buffer member 59 is disposed above the lamp unit 17. The buffer member 59 is an elastic body, for example, made of a rubber material. The buffer member 59 protects the substrate 54 and the optical component 57 from contacting the housing 4, which is a metal vibrating body. The buffer member 59 covers at least a portion of the upper surface of the lamp unit 17. Due to the interposition of the buffer member 59, the lamp unit 17 is held between the mounting surface 81 and the light-emitting body holding portion 61 in a state separated from the mounting surface 81 of the housing 4.

[0167] The buffer member 59 is annular. It overlaps the lamp unit 17 along its entire circumference. The buffer member 59 is held in an elastically deformed state by the lamp unit 17 and the mounting surface 81. The buffer member 59 is flattened by the lamp unit 17 due to the axial force of the screw 60S. The buffer member 59 deforms in accordance with the shape of the upper surface of the lamp unit 17, filling the gap between the lamp unit 17 and the mounting surface 81. The upper surface of the buffer member 59 contacts the mounting surface 81 and the cylindrical portion 82. The lower surface of the buffer member 59 contacts the lamp unit 17.

[0168] like Figure 12 and Figure 13 As shown, the cover 62 covers the wire 65. The wire 65 extends from the motor housing 21. The wire 65 is connected to the plurality of light emitters 53. In other words, the wire 65 extends from the lamp unit 17 to the motor housing 21 along the lower surface of the housing 4. The wire 65 connects the plurality of light emitters 53 to the controller 18. The wire 65 (see Figure 4) extends from the controller 18 through the battery holding portion 23 and the interior of the motor housing portion 21, and from the lower opening 21D on the front surface of the motor housing portion 21 to the lower surface side of the housing 4. The lead wire 65 extends forward along the lower surface of the housing 4 and is connected to the substrate 54 of the lamp unit 17. In this way, the lead wire 65 is connected to the multiple light-emitting elements 53 on the substrate 54, thereby supplying power.

[0169] like Figure 15 As shown, the wire 65 includes a first wire 65A extending from the motor housing 21; and a second wire 65B connected to the first wire 65A via a connector 66 and connected to the plurality of light-emitting elements 53. The first wire 65A extends forward from the interior of the motor housing 21 through the lower opening 21D of the motor housing 21 and extends to the lower surface of the housing 4. A connector 66A is provided on one side of the first wire 65A. The second wire 65B extends rearward from the substrate 54 of the lamp unit 17 along the lower surface of the housing 4. A connector 66B is provided on the other side of the second wire 65B. The connector 66A of the first wire 65A and the connector 66B of the second wire 65B are connected, thereby providing electrical continuity between the first wire 65A and the second wire 65B. The connector 66A and the connector 66B can be connected and removed by plugging them in and out. If the connector 66B is separated from the connector 66A, the subassembly consisting of the lamp unit 17, the second wire 65B, and the connector 66B can be separated from the power tool 1.

[0170] like Figure 14 and Figure 15 As shown, the housing 4 has a groove 84 on its lower surface for arranging the wires 65. The groove 84 is a recessed portion that extends upward from the lower surface of the housing 4. The groove 84 extends along the front-to-back direction from the rear end of the mounting surface 81 to the rear end of the housing 4 on the lower surface of the housing 4. The first wire 65A and the second wire 65B are arranged in the groove 84. The connector 66A of the first wire 65A and the connector 66B of the second wire 65B are connected in the groove 84.

[0171] The power tool 1 includes a grounding wire 67 extending from the motor housing 21 and connected to the lower surface of the housing 4. The grounding wire 67 is connected to a grounding terminal 84B provided on the lower surface of the housing 4. The grounding terminal 84B is disposed in a groove 84. The grounding wire 67 passes through the groove 84 from the lower opening 21D of the motor housing 21 and is connected to the grounding terminal 84B. The lead wire 65 and the grounding wire 67 are disposed in the same groove 84.

[0172] The groove portion 84 has a narrow passage portion 84A at the rear end. The passage portion 84A extends to the rear surface of the housing 4. Figure 13) extending through the passage 84A. The passage 84A can be used to position the starting points of the wires 65 and the grounding wire 67 on the lower surface of the housing 4 at the position of the passage 84A, and can also be used to bundle a plurality of wires.

[0173] The cover 62 covers the lead wires 65 and the ground wiring 67. The cover 62 covers the groove 84 in which the lead wires 65 are located. The cover 62 covers the ground wiring 67 and the ground terminal 84B. The cover 62 extends from the lower surface of the housing 4, where the plurality of light emitters 53 are located, to the motor housing 21. Specifically, the cover 62 extends rearward from the rear end of the light emitter holder 61. The cover 62 extends to the front surface of the motor housing 21. The cover 62 covers the entire groove 84.

[0174] like Figure 16 As shown, the cover 62 has a cover recess 63 that is recessed downward from the upper surface opposite to the groove 84. A wiring storage space formed by the groove 84 and the cover recess 63 is formed between the lower surface of the housing 4 and the cover 62.

[0175] The cover 62 has a claw 62A that engages with the motor housing 21. The claw 62A is disposed at the rear end of the cover 62. The claw 62A protrudes rearward from the rear end of the cover 62. The claw 62A is inserted into the motor housing 21 (see FIG. Figure 13 ) and engages with the motor housing 21. The rear end of the cover 62 is movable in the front-to-back direction and prevents downward movement due to the engagement between the motor housing 21 and the claw 62A. The cover 62 is fixed to the housing 4 with the claw 62A engaged with the motor housing 21. The cover 62 entirely covers the lower opening 21D of the motor housing 21.

[0176] like Figure 12 and Figure 13 As shown, the lamp cover 60, which includes the light-emitting body holding portion 61 and the cover portion 62, substantially covers the entire lower surface of the housing 4. When assembling the power tool 1, the assembler places the lamp unit 17 on the mounting surface 81 with the aid of the buffer member 59, connects the connector 66A and the connector 66B, and then mounts the lamp cover 60 on the housing 4. The lamp cover 60 is fixed to the housing 4 by screws 60S at the four bosses 61H, with the claw portion 62A inserted and engaged in the lower opening 21D of the motor housing portion 21. When replacing the lamp unit 17 during maintenance, etc., after removing the lamp cover 60 from the housing 4 in the reverse order, the lighting assembly of the lamp unit 17, the second lead wire 65B, and the connector 66B can be removed from the power tool 1 simply by separating the connector 66A and the connector 66B.

[0177] (Bearing retaining structure)

[0178] Figure 17 FIG. 9 is a longitudinal sectional view showing the periphery of the bevel gear 35 of the electric power tool 1 according to the embodiment. Figure 18 FIG. 10 is an exploded perspective view showing the rear surface of the housing 4 according to the embodiment. Figure 19 FIG. 11 is an exploded perspective view showing the front surface of the motor housing portion 21 according to the embodiment. Figure 20 FIG. 12 is an exploded perspective view showing the bevel gear 35, the bearing 38F, and the intermediate support member 91 according to the embodiment. Figure 21 FIG. 13 is a longitudinal sectional view showing the intermediate support member 91 according to the embodiment.

[0179] As described above, the electric power tool 1 is provided with the bearing 38F that holds the bevel gear 35 so as to be rotatable. The bearing 38F is in contact with the rotor shaft portion 33 and holds the bevel gear 35 so as to be rotatable by means of the rotor shaft portion 33. The bearing 38F is held by the housing 4. The bearing 38F is held at the rear portion of the housing 4.

[0180] As shown in FIG. 12, the electric power tool 1 is provided with the intermediate support member 91 having a front surface in contact with the bearing 38F and the fixing member FM in contact with the rear surface of the intermediate support member 91. The fixing member FM fixes the intermediate support member 91 by sandwiching only with the housing 4. Thus, the fixing member FM and the housing 4 hold the bearing 38F by sandwiching the bearing 38F and the intermediate support member 91 disposed at the rear surface of the bearing 38F. Figure 17

[0181] The fixing member FM can be an independent member or can be integrally formed with a member that constitutes the electric power tool 1. In the embodiment, the fixing member FM is integrally formed with the motor housing portion 21. The fixing member FM is the support wall 21G integrally formed with the motor housing portion 21. Thus, the bearing 38F is sandwiched by the motor housing portion 21 and the housing 4 connected in the front-rear direction.

[0182] The bearing 38F is a ball bearing having an inner ring 71, an outer ring 72, and balls 73. The rotor shaft portion 33 is fitted to the inner ring 71. The front end portion of the inner ring 71 opposes the rear surface of the bevel gear 35. The rear end portion of the inner ring 71 opposes the stepped portion of the rotor shaft portion 33.

[0183] As shown in FIG. 12, the electric power tool 1 is provided with the intermediate support member 91 having a front surface in contact with the bearing 38F and the fixing member FM in contact with the rear surface of the intermediate support member 91. The fixing member FM fixes the intermediate support member 91 by sandwiching only with the housing 4. Thus, the fixing member FM and the housing 4 hold the bearing 38F by sandwiching the bearing 38F and the intermediate support member 91 disposed at the rear surface of the bearing 38F. Figure 17 Figure 18 ​​As shown in FIG. 6, the housing 4 has a housing recessed portion 85 recessed forward from the rear portion of the housing 4 and housing the bearing 38F. The bearing 38F is disposed inside the housing recessed portion 85. The housing 4 has an outer cylindrical portion 86 formed with the housing flange portion 4F and an inner cylindrical portion 87 formed with the housing recessed portion 85. The inner cylindrical portion 87 is formed more radially inward than the outer cylindrical portion 86. The inner cylindrical portion 87 is cylindrical and the inner diameter decreases in steps. That is, the inner cylindrical portion 87 includes the housing recessed portion 85 having an inner diameter D1 and a hole portion 88 having an inner diameter D2. The inner diameter D2 is smaller than the inner diameter D1. The housing recessed portion 85 is a recessed portion recessed forward from the rear surface of the housing 4. The bearing 38F is disposed inside the housing recessed portion 85. The bearing 38F is in contact with the inner peripheral surface of the housing recessed portion 85 and the front surface of the housing recessed portion 85 (the stepped portion between the housing recessed portion 85 and the hole portion 88) corresponding to the bottom surface of the housing recessed portion 85. The hole portion 88 is a through hole along the rotation axis AX. The bevel gear 35 is disposed inside the hole portion 88. The bevel gear 35 passes through the hole portion 88 and engages with the driven gear 41A.

[0184] According to this structure, the housing 4 has a radial support surface 85A that receives a radial load acting on the bearing 38F and a front side support surface 85B that receives a forward thrust load acting on the bearing 38F. The radial support surface 85A is the inner peripheral surface of the housing recessed portion 85. The front side support surface 85B is the front surface (bottom surface) of the housing recessed portion 85.

[0185] The radial support surface 85A is annular. The outer ring 72 of the bearing 38F is fitted to the radial support surface 85A. A groove 85D in which an O-ring 85C is disposed is provided in the radial support surface 85A. The O-ring 85C is in contact with the inner surface of the groove 85D and the outer ring 72.

[0186] The front side support surface 85B is annular. The front side support surface 85B opposes the outer ring 72 of the bearing 38F in the front-rear direction. The front side support surface 85B is in contact with the front end surface of the outer ring 72.

[0187] As shown in FIG. 6, the housing 4 has a housing recessed portion 85 recessed forward from the rear portion of the housing 4 and housing the bearing 38F. The bearing 38F is disposed inside the housing recessed portion 85. The housing 4 has an outer cylindrical portion 86 formed with the housing flange portion 4F and an inner cylindrical portion 87 formed with the housing recessed portion 85. The inner cylindrical portion 87 is formed more radially inward than the outer cylindrical portion 86. The inner cylindrical portion 87 is cylindrical and the inner diameter decreases in steps. That is, the inner cylindrical portion 87 includes the housing recessed portion 85 having an inner diameter D1 and a hole portion 88 having an inner diameter D2. The inner diameter D2 is smaller than the inner diameter D1. The housing recessed portion 85 is a recessed portion recessed forward from the rear surface of the housing 4. The bearing 38F is disposed inside the housing recessed portion 85. The bearing 38F is in contact with the inner peripheral surface of the housing recessed portion 85 and the front surface of the housing recessed portion 85 (the stepped portion between the housing recessed portion 85 and the hole portion 88) corresponding to the bottom surface of the housing recessed portion 85. The hole portion 88 is a through hole along the rotation axis AX. The bevel gear 35 is disposed inside the hole portion 88. The bevel gear 35 passes through the hole portion 88 and engages with the driven gear 41A. Figure 17 , Figure 19 and Figure 20 As shown in FIG. 6, the housing 4 has a housing recessed portion 85 recessed forward from the rear portion of the housing 4 and housing the bearing 38F. The bearing 38F is disposed inside the housing recessed portion 85. The housing 4 has an outer cylindrical portion 86 formed with the housing flange portion 4F and an inner cylindrical portion 87 formed with the housing recessed portion 85. The inner cylindrical portion 87 is formed more radially inward than the outer cylindrical portion 86. The inner cylindrical portion 87 is cylindrical and the inner diameter decreases in steps. That is, the inner cylindrical portion 87 includes the housing recessed portion 85 having an inner diameter D1 and a hole portion 88 having an inner diameter D2. The inner diameter D2 is smaller than the inner diameter D1. The housing recessed portion 85 is a recessed portion recessed forward from the rear surface of the housing 4. The bearing 38F is disposed inside the housing recessed portion 85. The bearing 38F is in contact with the inner peripheral surface of the housing recessed portion 85 and the front surface of the housing recessed portion 85 (the stepped portion between the housing recessed portion 85 and the hole portion 88) corresponding to the bottom surface of the housing recessed portion 85. The hole portion 88 is a through hole along the rotation axis AX. The bevel gear 35 is disposed inside the hole portion 88. The bevel gear 35 passes through the hole portion 88 and engages with the driven gear 41A.

[0188] Specifically, the front surface of the motor housing portion 21 includes a housing flange portion 21F provided with screw insertion holes 21H at the four corners, an annular rib 21E protruding forward from the housing flange portion 21F, and a support wall 21G. The annular rib 21E is disposed in the space between the outer cylinder portion 86 and the inner cylinder portion 87 of the housing 4. The inner cylinder portion 87 is disposed in the inner periphery of the annular rib 21E. A protruding portion 21J protruding forward is provided at the lower portion of the annular rib 21E. The protruding portion 21J is inserted into the engagement hole 89 of the housing 4. The rotation of the housing 4 relative to the motor housing portion 21 about the rotation axis AX is positioned by the protruding portion 21J and the engagement hole 89.

[0189] The support wall 21G is disposed on the inner side of the annular rib 21E. The support wall 21G extends to the radially inner side from the annular rib 21E. A central opening 92 through which the rotor shaft portion 33 passes is formed in the support wall 21G. The support wall 21G is annular. The support wall 21G opposes the front side support surface 85B of the accommodation recess 85 in the front-rear direction. The support wall 21G opposes the bearing 38F in the front-rear direction. The support wall 21G opposes the rear end surface of the outer ring 72 of the bearing 38F across the intermediate support member 91.

[0190] A recess 93 in which the intermediate support member 91 is disposed is formed in the front surface of the support wall 21G. The recess 93 is recessed rearward from the front surface. The recess 93 has a shape corresponding to the outer shape of the intermediate support member 91, and the intermediate support member 91 is disposed in the recess 93. The bottom surface of the recess 93 recessed rearward is a rear side support surface 94 that contacts the rear surface of the intermediate support member 91. The rear side support surface 94 receives the rearward thrust load acting on the bearing 38F. In this way, the motor housing portion 21 has the rear side support surface 94 that receives the rearward thrust load acting on the bearing 38F. The rear side support surface 94 is the front surface of the support wall 21G, and is the bottom surface of the recess 93 in which the intermediate support member 91 is disposed.

[0191] The intermediate support member 91 contacts the rear surface of the bearing 38F at the front surface, and contacts the fixed member FM at the rear surface. The front surface of the intermediate support member 91 contacts the rear end surface of the outer ring 72 of the bearing 38F. The rear surface of the intermediate support member 91 contacts the rear side support surface 94 in the front surface of the support wall 21G, which is the fixed member FM. The intermediate support member 91 is a flat plate having a constant thickness.

[0192] The intermediate support member 91 is disposed along the rear surface of the bearing 38F. The front surface of the intermediate support member 91 extends in a circular shape along the rear end surface of the outer ring 72 of the bearing 38F. The intermediate support member 91 is disposed so as to surround the rotor shaft portion 33 and has a C-shape with one end and the other end. In other words, the intermediate support member 91 is non-annular, with a gap CL formed between the one end and the other end. In the embodiment, the gap CL is larger than the diameter of the rotor shaft portion 33 in a cross section along the front surface of the intermediate support member 91. The inner circumference of the intermediate support member 91 is arc-shaped. Each side of the outer circumference of the intermediate support member 91 is linear, and the outer circumference of the intermediate support member 91 is square, excluding the area of ​​gap CL.

[0193] As described above, the fixing member FM and the housing 4 fix the intermediate support member 91 simply by sandwiching it. "Fixed simply by sandwiching" means that the intermediate support member 91 is not fixed by any other means, such as screws or rivets, other than being clamped between the fixing member FM and the housing 4. The intermediate support member 91 is not provided with a screw insertion hole.

[0194] One of the intermediate support member 91 and the fixed member FM elastically deforms the other. Specifically, the intermediate support member 91 and the fixed member FM are assembled in a compressed state in the front-to-back direction by the force holding the intermediate support member 91. Consequently, there is no play (play) in the front-to-back direction of the bearing 38F between the housing 4 and the fixed member FM.

[0195] Either the intermediate support member 91 or the fixing member FM may be elastically deformed. However, in the embodiment, as shown in FIG. Figure 21 As shown, the fixing member FM undergoes elastic deformation. Specifically, the hardness of the intermediate support member 91 is higher than that of the fixing member FM. The intermediate support member 91 is made of metal. The fixing member FM is made of resin. The fixing member FM clamps the intermediate support member 91 as it elastically deforms. The intermediate support member 91 is clamped so that its rear surface is slightly sunken into the fixing member FM. In addition, for convenience, Figure 21 The deformed state of the fixing member FM is not shown in the other figures.

[0196] In the embodiment, the radial width W1 of the rear surface of the intermediate support member 91 is greater than the radial width W2 of the outer ring 72 (i.e., the thickness of the outer ring 72). Therefore, the intermediate support member 91 contacts the fixed member FM over a larger area than the outer ring 72, thereby distributing the thrust load acting from the outer ring 72.

[0197] Here, the load acting on bearing 38F will be described. In the embodiment, bevel gear 35 and driven gear 41A are spiral bevel gears. Spiral bevel gears are bevel gears whose tooth lines are helically curved around the rotation axis. Compared to straight bevel gears, whose tooth lines are straight and radially extending, spiral bevel gears have a larger contact area between the gears and a greater number of meshing teeth, resulting in high strength (high torque transmission), low noise, low vibration, and low wear.

[0198] The transmission of rotation by spiral bevel gears generates not only radial loads but also thrust loads. The thrust load depends on the gear ratio between bevel gear 35 and driven gear 41A, but the direction of the thrust load may reverse depending on the difference in forward and reverse rotation. Therefore, the bevel gear 35 may be subjected to both radial loads and thrust loads in both forward and rearward directions along the rotation axis AX.

[0199] exist Figure 17 In the example, the bevel gear 35 is fixed to the rotor shaft 33, and the inner ring 71 of the bearing 38F is fixed to the rotor shaft 33. Therefore, the thrust load acting on the bevel gear 35 is transmitted to the bearing 38F. The forward thrust load transmitted to the bearing 38F is borne by the front support surface 85B of the housing 4 via the outer ring 72. The rearward thrust load transmitted to the bearing 38F acts on the intermediate support member 91 via the outer ring 72, and is further borne by the rear support surface 94 of the support wall 21G, which serves as the fixing member FM, via the intermediate support member 91. If the thickness of the outer ring 72 is small, the contact area with the outer ring 72 is close to line contact, resulting in a high surface pressure locally. However, by sandwiching the intermediate support member 91 between the outer ring 72 and the rear support surface 94, the contact area with the rear support surface 94 is increased, thereby reducing the surface pressure acting on the rear support surface 94 formed in the resin motor housing 21.

[0200] Furthermore, the radial load acting on the bevel gear 35 acts on the bearing 38F via the rotor shaft portion 33 , and is received by the radial support surface 85A of the housing 4 .

[0201] (Assembly workability of intermediate support member)

[0202] Figure 22 2 is an exploded perspective view showing the subassembly of the rotor 27 according to the embodiment. Figure 22As shown, when assembling the impact tool 1, a subassembly is preassembled to attach related components such as the bearing 38F and the intermediate support member 91 to the rotor 27. The fan 12, the intermediate support member 91, the bearing 38F, and the bevel gear 35 are then assembled to the rotor shaft 33 in this order from the rear. In this embodiment, the intermediate support member 91 has a C-shape, so the rotor shaft 33 can be radially assembled to the intermediate support member 91 by passing it through the gap CL. In other words, even if the bearing 38F and the bevel gear 35 are assembled first, the intermediate support member 91 can still be assembled from the rear to the desired position. Therefore, even if the intermediate support member 91 is forgotten to be assembled, it can be corrected later, resulting in high assembly efficiency.

[0203] (How to use)

[0204] The method of using the power tool 1 involved in the embodiment will be described. For example, when performing a fastening operation on an object to be worked on, a sleeve serving as a front end tool is mounted on the front end tool holder 51. When the operator operates the trigger shifter 14, power is supplied from the battery pack 25, the motor 6 is started, and light is emitted from the light source 53 of the lamp unit 17. The light from the lamp unit 17 is emitted downward from the periphery of the anvil 10, so that the light can reach the work area even in a narrow place with many obstacles. The brightness of the light emitted from the lamp unit 17 is high, and the work area can be brightly illuminated.

[0205] The motor 6 drives the rotor 27 to rotate. As the rotor 27 rotates, its rotational force is transmitted to the spindle 8 via the speed reduction mechanism 7. The spindle 8 rotates at a speed lower than that of the rotor shaft 33. When the spindle 8 rotates while the hammer protrusion 47B and the anvil protrusion 10B are in contact, the anvil 10 rotates along with the hammer 47 and the spindle 8. The rotation of the anvil 10 causes the tip tool to rotate, thereby performing the tightening operation.

[0206] When a load exceeding a specified value is applied to the anvil 10 by the front end tool during the tightening operation, the rotation of the anvil 10 and the hammer 47 stops. When the main shaft 8 rotates while the hammer 47 stops rotating, the hammer 47 moves upward. When the hammer 47 moves upward and the contact between the hammer protrusion 47B and the anvil protrusion 10B is released, the hammer 47 moved to the upper side rotates and moves downward with the elastic force of the coil spring 49. The hammer 47 rotates and moves downward, causing the anvil 10 to be struck by the hammer 47 in the rotation direction. As a result, the anvil 10 and the front end tool rotate with a high torque around the rotation axis BX. Therefore, the bolt or nut is tightened with a high torque.

[0207] (Effect)

[0208] As described above, in the embodiment, the power tool 1 includes: a grip portion 22 extending in the front-to-back direction; a motor housing portion 21 arranged in front of the grip portion 22; a motor 6 arranged inside the motor housing portion 21 and having a stator 26 and a rotor 27 rotatable relative to the stator 26; a bevel gear 35 rotating integrally with the rotor 27 and having an axis extending in the front-to-back direction; a spindle 8 rotating directly or indirectly with the aid of the bevel gear 35 and extending in a direction intersecting the front-to-back direction; a front end tool holding portion 51 rotating through the spindle 8; a housing 4 accommodating the bevel gear 35 and the spindle 8; and a bearing 38F held in the housing 4 and holding the bevel gear 35 rotatable.

[0209] With the above-described structure, the bearing 38F, which rotatably holds the bevel gear 35 that rotates integrally with the rotor 27, can be held in the housing 4 together with the bevel gear 35. This eliminates the need for separate retaining components such as a housing or bracket dedicated to the bearing and the housing 4. Therefore, a dedicated bearing retaining component is not required, and accordingly, the gear portion of the power tool 1 can be miniaturized.

[0210] In the embodiment, the power tool 1 further includes a hammer 47 rotated by the spindle 8 and an anvil 10, which is struck directly or indirectly in the direction of rotation by the hammer 47. A tool tip holder 51 is disposed at the lower end of the anvil 10. The housing 4 houses the bevel gear 35, the spindle 8, and the hammer 47.

[0211] With the above-described structure, it is possible to provide an impact tool capable of achieving miniaturization of the gear portion.

[0212] In the embodiment, the rotor 27 includes a rotor shaft portion 33 extending in the front-rear direction. The rotor shaft portion 33 extends from the motor housing portion 21 toward the interior space of the casing 4. A bevel gear 35 is fixed to the rotor shaft portion 33.

[0213] In the above structure, the bevel gear 35 is used as a pinion fixed to the rotor shaft 33. The rotor shaft 33 can also be rotationally supported by the bearing 38F that rotatably holds the bevel gear 35. The same bearing 38F can be used to rotationally support the rotor shaft 33 and the bevel gear 35.

[0214] In the embodiment, the bearing 38F is in contact with the rotor shaft portion 33 , and rotatably holds the bevel gear 35 via the rotor shaft portion 33 .

[0215] With the above configuration, the bevel gear 35 does not need to be provided with a portion that is supported in contact with the bearing 38F, and thus the bevel gear 35 can be reduced in size.

[0216] In the embodiment, the housing 4 has a radial support surface 85A that receives a radial load acting on the bearing 38F and a front-side support surface 85B that receives a forward thrust load acting on the bearing 38F.

[0217] With the above-described structure, the radial load accompanying the transmission of the rotational force of the bevel gear 35 and the forward thrust load can be received by the housing 4.

[0218] In the embodiment, the motor housing portion 21 and the housing 4 are connected in the front-rear direction. The motor housing portion 21 has a rear-side support surface 94 that receives a rearward thrust load acting on the bearing 38F.

[0219] With the above-described structure, the rearward thrust load accompanying the transmission of the rotational force of the bevel gear 35 can be received by the motor housing portion 21. The bearing 38F can be held and the load can be received by the motor housing portion 21 and the housing 4.

[0220] In the embodiment, the power tool 1 is provided with an intermediate shaft (first intermediate shaft 41C, second intermediate shaft 42B) that is disposed between the bevel gear 35 and the main shaft 8 and that transmits the rotation of the bevel gear 35 to the main shaft 8. The intermediate shaft is housed in the housing 4 and extends in a direction intersecting the front-rear direction.

[0221] With the above-described structure, the rotation of the bevel gear 35 can be decelerated and transmitted to the main shaft 8 by the intermediate shaft (first intermediate shaft 41C, second intermediate shaft 42B). The overall length of the power tool 1 in the front-rear direction can be shortened compared to a case in which the intermediate shaft extends in the front-rear direction.

[0222] In the embodiment, the power tool 1 is further provided with a first intermediate shaft 41C that has a driven gear 41A engaged with the bevel gear 35 and that decelerates the rotation of the bevel gear 35 and a second intermediate shaft 42B that decelerates the rotation of the first intermediate shaft 41C and transmits it to the main shaft 8.

[0223] With the above-described structure, multi-stage deceleration can be performed in the process of transmitting the rotation to the main shaft 8 by means of the bevel gear 35. Thus, a higher torque suitable for the power tool 1 can be obtained.

[0224] In the embodiment, the main shaft 8 extends in a direction orthogonal to the front-rear direction.

[0225] With the above-described structure, the output shaft is provided in a direction orthogonal to the front-rear direction, so that a corner power tool suitable for work in a narrow place can be obtained.

[0226] In an embodiment, the power tool 1 includes: a grip portion 22 extending in the front-to-back direction; a motor housing portion 21 arranged in front of the grip portion 22; a motor 6 arranged inside the motor housing portion 21 and having a stator 26 and a rotor 27 capable of rotating relative to the stator 26; a pinion (bevel gear 35) rotating integrally with the rotor 27; a reduction mechanism portion 7 connected to the pinion; a spindle 8 connected to the reduction mechanism portion 7 and extending in a direction intersecting the front-to-back direction; a front end tool holding portion 51 rotated by the spindle 8; a housing 4 accommodating the pinion, the reduction mechanism portion 7 and the spindle 8; and a bearing 38F held in the housing 4 and holding the pinion so as to be rotatable.

[0227] With the above-described structure, the bearing 38F, which rotatably holds the pinion gear that rotates integrally with the rotor 27, can be held together with the pinion gear in the housing 4. This eliminates the need for separate retaining components such as a housing or bracket dedicated to the bearing and the housing 4. Therefore, a dedicated bearing retaining component is not required, thereby enabling the gear portion of the power tool 1 to be miniaturized.

[0228] In the embodiment, the motor housing portion 21 and the housing 4 are connected in the front-rear direction. The bearing 38F is sandwiched between the motor housing portion 21 and the housing 4.

[0229] In the above-described structure, the bearing 38F is sandwiched between the motor housing portion 21 and the case 4 , and therefore, the bearing 38F can be held without increasing the number of components.

[0230] In the embodiment, the housing 4 includes the housing recess 85 that is recessed from the rear portion of the housing 4 toward the front and that accommodates the bearing 38F.

[0231] With the above-described structure, by providing the housing recess 85 for housing the bearing 38F in the housing 4 , the radial load and the forward thrust load acting on the bearing 38F can be received by the housing 4 .

[0232] In the embodiment, the motor housing portion 21 has a support wall 21G on the front surface of the motor housing portion 21 that directly or indirectly supports the rear surface of the bearing 38F.

[0233] With the above-described structure, the motor housing portion 21 can receive the rearward thrust load acting on the bearing 38F.

[0234] In the embodiment, the speed reduction mechanism 7 includes a first speed reduction unit 41 connected to the pinion gear (bevel gear 35 ) and rotating the pinion gear by reducing the speed of the pinion gear; and a second speed reduction unit 42 that reduces the speed of the first speed reduction unit 41 and transmits the reduced speed of the rotation to the main shaft 8 .

[0235] The above-described structure enables multi-stage speed reduction in the process of transmitting the rotation to the main shaft 8. This makes it possible to obtain a high torque required by the electric power tool 1.

[0236] In an embodiment, the electric tool 1 includes: a grip 22 extending in the front-to-back direction; a motor housing 21 arranged in front of the grip 22; a motor 6 arranged inside the motor housing 21 and having a stator 26 and a rotor 27 rotatable relative to the stator 26; a bevel gear 35 that is rotated directly or indirectly by the rotor 27 and has an axis extending in the front-to-back direction; a spindle 8 that is rotated directly or indirectly by means of the bevel gear 35 and extends in a direction intersecting the front-to-back direction; a front end tool holding portion 51 that is rotated by the spindle 8; a housing 4 that accommodates the bevel gear 35 and the spindle 8; a bearing 38F supported by the housing 4 and holding the bevel gear 35 rotatable; an intermediate support member 91 having a front surface in contact with the bearing 38F; and a fixing member FM that is in contact with the rear surface of the intermediate support member 91 and, together with the housing 4, fixes the intermediate support member 91 only by clamping.

[0237] Regarding the above structure, the bevel gear 35 is supported by the bearing 38F that is rotatable and is supported by the housing 4, and the rear surface of the bearing 38F is supported by the intermediate support member 91 and the fixing member FM. Even if a thrust load is generated by the transmission of the rotational force of the bevel gear 35, the thrust load can be borne by the bearing 38F and the housing 4 or the fixing member FM. The intermediate support member 91 that is in contact with the bearing 38F is fixed by the housing 4 and the fixing member FM by clamping, thereby preventing the generation of a gap (rocking) in the direction of the thrust load of the bearing 38F. As a result, the bevel gear 35 can be properly held in the angle power tool. In addition, the intermediate support member 91 is fixed only by clamping, so there is no need to provide components such as screws to fix the intermediate support member 91. Therefore, the number of components can be reduced and the gear part can be miniaturized.

[0238] In the embodiment, one of the intermediate supporting member 91 and the fixing member FM elastically deforms the other.

[0239] The above-described structure can absorb dimensional tolerances by elastic deformation, and thus can reliably prevent the occurrence of play (play) in the direction in which the thrust load of the bearing 38F acts.

[0240] In the embodiment, the bearing 38F includes a ball bearing having an inner ring 71, an outer ring 72, and balls 73. The intermediate support member 91 is made of metal and contacts the outer ring 72. The fixing member FM is made of resin and sandwiches the intermediate support member 91 as it elastically deforms.

[0241] With this structure, the intermediate support member 91, which contacts the outer ring 72 of the bearing 38F, can be made of metal and bear the thrust load, while the fixing member FM can be made of resin and elastically deform. This achieves a structure that prevents play (play) in the direction of the thrust load of the bearing 38F and can also withstand the concentrated load when receiving a thrust load from the outer ring 72.

[0242] In the embodiment, the radial width W1 of the rear surface of the intermediate support member 91 is larger than the radial width W2 of the outer ring 72 .

[0243] The above structure allows the contact area between the rear surface of the intermediate support member 91 and the fixing member FM to be larger than the contact area between the outer ring 72 and the front surface of the intermediate support member 91. Therefore, when a thrust load is applied from the outer ring 72, the intermediate support member 91 can increase the contact area, thereby reducing the surface pressure acting on the resin fixing member FM.

[0244] In the embodiment, the rotor 27 has a rotor shaft 33 extending in the front-rear direction. The intermediate support member 91 is provided along the rear surface of the bearing 38F to surround the rotor shaft 33 and has a C-shape having one end and the other end.

[0245] With the above-described structure, by forming the intermediate support member 91 into a C-shape, the intermediate support member 91 can be assembled to the rotor shaft portion 33 from the radial direction during assembly of the power tool 1. Therefore, even if the assembler mistakenly assembles the components in the wrong order, the intermediate support member 91 can be assembled from the rear, thereby improving assembly workability.

[0246] In the embodiment, the fixing member FM is formed integrally with the motor housing portion 21 .

[0247] The above configuration can reduce the number of components and reduce the size of the gear portion, compared to a case where the fixing member FM is provided as a separate member from the motor housing portion 21 .

[0248] [Second embodiment]

[0249] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0250] Figure 23 It is a perspective view showing an intermediate support member 91A according to the second embodiment. Figure 24 It is an exploded perspective view showing a subassembly of a motor 6 according to the second embodiment.

[0251] In the first embodiment, an example in which the intermediate support member 91 has a C-shape was shown, but the intermediate support member 91A according to the second embodiment has an annular shape.

[0252] The intermediate support member 91A has an annular shape that extends along the rear surface of the bearing 38F. The intermediate support member 91A has a circular inner circumference and a substantially square outer circumference. The four corners of the outer circumference of the intermediate support member 91A are chamfered. The annular intermediate support member 91A contacts the rear surface of the bearing 38F throughout its entire circumference.

[0253] Unlike the C-shaped intermediate support member 91, the annular intermediate support member 91A cannot be assembled radially onto the rotor shaft 33. Therefore, the fan 12, intermediate support member 91A, bearing 38F, and bevel gear 35 are assembled axially onto the rotor shaft 33 from the front in this order.

[0254] Effects

[0255] As described above, in the second embodiment, the intermediate support member 91A has an annular shape that follows the rear surface of the bearing 38F.

[0256] With the above-described structure, the annular intermediate support member 91A can bear the thrust load over the entire circumference of the bearing 38F.

[0257] [Third embodiment]

[0258] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0259] Figure 25 It is a cross-sectional view showing an intermediate support member 91B according to the third embodiment.

[0260] In the second embodiment, the intermediate support member 91A having a circular inner periphery and a square outer periphery was shown. However, the intermediate support member 91B according to the third embodiment has an annular shape.

[0261] The intermediate support member 91B has an annular shape that extends along the rear surface of the bearing 38F. The intermediate support member 91B has a circular inner circumference and a circular outer circumference. In other words, the intermediate support member 91B is a circular ring-shaped washer. The annular intermediate support member 91B contacts the rear surface of the bearing 38F throughout its entire circumference. The intermediate support member 91B is a flat plate with a constant thickness.

[0262] When assembling the subassembly, the fan 12 , the intermediate support member 91B, the bearing 38F, and the bevel gear 35 are assembled to the rotor shaft portion 33 in the axial direction from the front in this order.

[0263] [Fourth embodiment]

[0264] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0265] Figure 26 It is a cross-sectional view showing an intermediate support member 91C according to the fourth embodiment. Figure 27 It is a longitudinal sectional view showing the periphery of an intermediate support member 91C according to the fourth embodiment.

[0266] While the third embodiment shows the intermediate support member 91B having a circular ring shape with a constant thickness, the intermediate support member 91C according to the fourth embodiment has a stepped circular ring shape.

[0267] The intermediate support member 91C has an annular shape that extends along the rear surface of the bearing 38F. The intermediate support member 91C has a circular inner circumference and a circular outer circumference. In other words, the intermediate support member 91C is annular. The annular intermediate support member 91C contacts the rear surface of the bearing 38F over its entire circumference.

[0268] The intermediate support member 91C has a step between its inner and outer peripheries, indicating a positional offset in the thickness direction. In other words, the intermediate support member 91C includes an outer periphery 101 and an inner periphery 102 located further inward from the outer periphery 101, with the outer periphery 101 offset forward relative to the inner periphery 102. Furthermore, the intermediate support member 91C has a constant thickness, with the inner periphery 102 and outer periphery 101 having substantially the same thickness.

[0269] In the fourth embodiment, the fixing member FM (support wall 21G) of the motor housing 21 is provided with an outer peripheral mounting portion 103 that contacts the rear surface of the outer peripheral portion 101 of the intermediate support member 91C, and an inner peripheral mounting portion 104 that contacts the rear surface of the inner peripheral portion 102 of the intermediate support member 91C. The outer peripheral mounting portion 103 and the inner peripheral mounting portion 104 are offset forward relative to the inner peripheral mounting portion 104, corresponding to the front-to-back offset between the outer peripheral portion 101 and the inner peripheral portion 102.

[0270] In the fourth embodiment, the peripheral wall of the housing 4's receiving recess 85 is also offset forward, corresponding to the outer periphery of the intermediate support member 91C and the outer peripheral mounting portion 103 of the motor housing 21. As a result, the depth D3 of the housing 4's receiving recess 85 (depth from the rear surface to the front) is smaller than the thickness D4 of the bearing 38F in the front-to-back direction. The bearing 38F protrudes further rearward than the rear end of the receiving recess 85. The rear end of the bearing 38F is located further rearward than the outer periphery 101 of the intermediate support member 91C and contacts the front surface of the inner periphery 102 of the intermediate support member 91C.

[0271] With this structure, the rearward thrust load acting on the bearing 38F is applied to the inner circumference 102 of the intermediate support member 91C. Since the intermediate support member 91C contacts the motor housing 21 at both the inner circumference 102 and the outer circumference 101, the thrust load applied to the intermediate support member 91C is borne by the inner circumference mounting portion 104 and the outer circumference mounting portion 103 at both the inner circumference 102 and the outer circumference 101, respectively.

[0272] In the fourth embodiment, the outer peripheral mounting portion 103 is offset forward, thereby allowing the front side to be provided with a thickness sufficient to ensure that the support wall 21G of the motor housing 21 can withstand the thrust load. Accordingly, the rear surface of the support wall 21G of the motor housing 21 can be formed so as not to protrude rearward, thereby easily ensuring space for the fan 12.

[0273] [Fifth embodiment]

[0274] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0275] Figure 28 It is a longitudinal sectional view showing an intermediate support member 91D and a fixing member FM according to the fifth embodiment.

[0276] In the first embodiment, an example is shown in which, of the intermediate supporting member 91 and the fixing member FM, the fixing member FM elastically deforms. However, in this fifth embodiment, an example is shown in which, of the intermediate supporting member 91D and the fixing member FM, the intermediate supporting member 91D elastically deforms.

[0277] In the fifth embodiment, the intermediate support member 91D is made of resin. The fixing member FM is made of metal. The fixing member FM sandwiches the intermediate support member 91D while elastically deforming it. In the fifth embodiment, the bearing 38F is a sliding bearing.

[0278] In the fifth embodiment, the intermediate support member 91D and the bearing 38F are held by being sandwiched in the front-rear direction by the metal housing 4 and the metal fixing member FM. The fixing member FM and the housing 4 fix the intermediate support member 91D simply by sandwiching.

[0279] Intermediate support member 91D is elastically deformed by being sandwiched between fixed member FM and bearing 38F. Intermediate support member 91D deforms so that the rear surface of bearing 38F sinks into the front surface of intermediate support member 91D. This prevents any play (play) between fixed member FM and housing 4, or in front of or behind bearing 38F.

[0280] Effects

[0281] As described above, in the fifth embodiment, the intermediate support member 91D is made of resin, and the fixing member FM is made of metal, and the intermediate support member 91D is sandwiched while being elastically deformed.

[0282] With the above-described structure, the intermediate support member 91D is used as a spacer or a buffer, thereby preventing the occurrence of play (play) in the direction in which the thrust load of the bearing 38F acts.

[0283] [Sixth embodiment]

[0284] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-mentioned embodiment, and the description of the components will be simplified or omitted.

[0285] Figure 29 It is a longitudinal sectional view showing the front portion of an electric power tool 1A according to a sixth embodiment.

[0286] In the first embodiment, the bevel gear 35 is an example of a pinion fixed to the rotor shaft 33 . However, in the sixth embodiment, the bevel gear 135 is provided separately from the pinion fixed to the rotor shaft 33 and is provided on a shaft different from the rotor shaft 33 .

[0287] The power tool 1A according to the sixth embodiment includes a bevel gear 135 having a shaft 111 extending in the front-rear direction and indirectly rotated by the rotor 27. The power tool 1A also includes a spur gear 112 as a pinion gear directly rotated by the rotor 27. The bevel gear 135 rotates about the shaft 111 by the rotational force of the spur gear 112.

[0288] The spur gear 112 is fixed to the rotor shaft portion 33. The spur gear 112 is fixed by being press-fitted to the front end of the rotor shaft portion 33. The spur gear 112 rotates together with the rotor 27 (the rotor shaft portion 33). The rotor shaft portion 33 is held rotatable by a rotor bearing 113F. The spur gear 112 engages with the driven gear 114.

[0289] The driven gear 114 is a spur gear. The driven gear 114 is fixed to the rear end portion of the shaft 111. The driven gear 114 is fixed by being press-fitted to the rear end of the shaft 111. The driven gear 114 rotates together with the shaft 111 and the bevel gear 135. The driven gear 114 rotates at a reduced speed of the rotation of the spur gear 112. The driven gear 114 constitutes a first-stage reduction portion of the reduction mechanism portion 7.

[0290] The shaft 111 extends in the front-rear direction. The shaft 111 is parallel to the rotation axis AX of the motor 6. The shaft 111 is housed in the housing 4. The shaft 111 is disposed at a position offset in the radial direction with respect to the rotation axis AX.

[0291] The bevel gear 135 is disposed further forward than the spur gear 112 and the driven gear 114. The bevel gear 135 is integrally formed at the front end of the shaft 111 or is separately fixed to the front end of the shaft 111. The bevel gear 135 is housed in the housing 4. The bevel gear 135 rotates about the central axis of the shaft 111. The bevel gear 135 engages with the first intermediate gear 115A provided to the intermediate shaft 115C.

[0292] The intermediate shaft 115C extends in a direction intersecting the rotation axis AX and the shaft 111. The intermediate shaft 115C extends in the up-down direction orthogonal to the rotation axis AX and the shaft 111 and is rotatable about the central axis in the up-down direction. The both ends of the intermediate shaft 115C are respectively supported rotatable by intermediate bearings 116. The intermediate bearings 116 are held to the housing 4. The first intermediate gear 115A and the second intermediate gear 115B are fixed to the intermediate shaft 115C. The intermediate shaft 115C, the first intermediate gear 115A, and the second intermediate gear 115B rotate together. The first intermediate gear 115A engages with the bevel gear 135. The first intermediate gear 115A is a bevel gear. The first intermediate gear 115A rotates at a reduced speed of the rotation of the bevel gear 135. The bevel gear 135 and the first intermediate gear 115A constitute a second-stage reduction portion of the reduction mechanism portion 7. The second intermediate gear 115B is a spur gear. The second intermediate gear 115B engages with the main shaft gear 8C of the main shaft 8. The main shaft gear 8C rotates at a reduced speed of the rotation of the second intermediate gear 115B. The second intermediate gear 115B and the main shaft gear 8C constitute a third-stage reduction portion of the reduction mechanism portion 7.

[0293] The bearing 139 is supported by the housing 4 and rotatably holds the bevel gear 135. The bearing 139 is in contact with the shaft 111 and rotatably supports the shaft 111. The bearing 139 rotatably holds the bevel gear 135 via the shaft 111.

[0294] The bearing 139 is housed in the housing recess 118 of the housing 4. The housing recess 118 has a radial support surface 118A and a front support surface 118B. The bearing 139 is a ball bearing. Figure 29 In the example shown in FIG. 1 , two sets of bearings 139 are arranged in the axial direction.

[0295] The intermediate support member 91E has a front surface that contacts the bearing 139. The intermediate support member 91E may be C-shaped or annular. In the sixth embodiment, the intermediate support member 91E is housed in the housing 4. The intermediate support member 91E covers a portion of the rear opening of the housing recess 118. The intermediate support member 91E contacts the rear end surface of the outer ring of the bearing 139, which is located behind the housing recess 118.

[0296] In the sixth embodiment, the fixing member FM is provided separately from the motor housing 21 and the casing 4. In the sixth embodiment, the fixing member FM is a metal gear box that houses the spur gear 112 and the driven gear 114. The fixing member FM is disposed between the casing 4 and the motor housing 21, spanning the two regions in the front-to-back direction.

[0297] The fixing member FM includes a first receiving chamber 121, which is recessed from the front surface toward the rear, and a second receiving chamber 122, which is recessed from the rear surface toward the front. The first receiving chamber 121 houses the spur gear 112 and the driven gear 114. The second receiving chamber 122 houses the rotor bearing 113F. The second receiving chamber 122 is continuous with the first receiving chamber 121 in the front-to-back direction. The front end of the rotor shaft 33 passes through the second receiving chamber 122 and is disposed within the first receiving chamber 121.

[0298] The housing 4 has a front receiving portion 119 for receiving the front portion of the fixing member FM. The front receiving portion 119 is a recessed portion that is recessed forward from the rear surface of the housing 4. A receiving recess 118 for the bearing 139 is formed on the wall surface on the front side of the bottom surface of the front receiving portion 119. The front receiving portion 119 and the receiving recess 118 are continuous. Therefore, the intermediate support member 91E is arranged on the wall surface on the front side of the bottom surface of the front receiving portion 119. The front portion of the fixing member FM is embedded in the front receiving portion 119. As a result, the fixing member FM contacts the rear surface of the intermediate support member 91E at the front surface. The fixing member FM contacts the rear surface of the intermediate support member 91E at the portion of the front end surface of the peripheral wall that defines the first receiving chamber 121.

[0299] The motor housing portion 21 has a rear housing portion 120 for housing the rear portion of the fixing member FM. The rear housing portion 120 is a recessed portion that is recessed rearward from the front surface of the motor housing portion 21. The rear portion of the fixing member FM is embedded in the rear housing portion 120. Although not shown in the figure, the motor housing portion 21 and the housing 4 are connected in the front-to-back direction in the same manner as in the first embodiment, and are fastened together by screws 70 facing in the front-to-back direction. The motor housing portion 21 and the housing 4 are fastened in the direction of approaching each other in the front-to-back direction by the axial force of the screws 70. As a result, the bearing 139, the intermediate support member 91E, and the fixing member FM are clamped by the motor housing portion 21 and the housing 4, and are clamped by the axial force of the screws 70. As a result, the fixing member FM, together with the housing 4, fixes the intermediate support member 91E simply by clamping. The intermediate support member 91E is disposed only in the front housing portion 119 , and is fixed together with the bearing 139 by being sandwiched between the front surface of the fixing member FM and the front support surface 118B of the housing 4 .

[0300] [Other embodiments]

[0301] In the above embodiment, the plurality of light-emitting bodies 53 may not be arranged along the circumference of the anvil 10. For example, the plurality of light-emitting bodies 53 may be arranged radially in the radial direction of the anvil 10. The optical component 57 may not be a ring that surrounds the anvil 10, but may have a shape corresponding to the configuration of the plurality of light-emitting bodies 53. The optical component 57 may be, for example, arc-shaped, square-shaped, radial, etc. The optical component 57 may be provided separately with respect to each light-emitting body 53. The plurality of light-emitting bodies 53 only need to be maintained in the shell 4, and may also be provided at the rear of the lower surface of the shell 4, the lower part of the side surface, etc. For example, the light-emitting body 53 may emit light obliquely downward from the rear of the lower surface of the shell 4 toward the bottom of the anvil 10. There may be not multiple light-emitting bodies 53, or only one light-emitting body 53 may be provided.

[0302] In the above embodiment, the electric tool 1 is set as an impact wrench. The electric tool 1 can also be an impact driver. In the case where the electric tool 1 is an impact driver, the front-end tool holding portion 51 includes a bit hole provided at the lower end of the anvil shaft portion 10A. The bit hole is provided to extend rearward from the front end portion of the anvil shaft portion 10A. The screwdriver bit as the front-end tool is maintained in a state of being inserted into the bit hole. In this case, the front-end tool holding portion 51 can have a tool holding mechanism that is inserted into the bit hole and maintains the screwdriver bit in a detachable manner.

[0303] Furthermore, the power tool 1 may be a power tool other than an impact tool. In other words, the power tool 1 may not include the striking mechanism 9 including the hammer 47 and the anvil 10. In this case, the front tool holder 51 may be provided at the front end of the spindle 8 and rotate integrally with the spindle 8, or it may be provided separately from the spindle 8 and rotated by the spindle 8 via a power transmission mechanism. Examples of power tools 1 other than impact tools include electric ratchet wrenches, electric angle grinders, and electric angle drills.

[0304] In the above embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via the intermediate support member 91 . However, the intermediate support member 91 may not be provided, and the support wall 21G may directly support the rear surface of the bearing 38F.

[0305] In the above embodiment, the power source of the electric tool 1 may not be the battery pack 25 but may be a commercial power source (AC power source).

Claims

1. An electric tool, characterized in that: The electric tool comprises: a grip portion extending in a front-to-rear direction; a motor housing portion, which is disposed in front of the grip portion; a motor disposed inside the motor housing and having a stator and a rotor rotatable relative to the stator; a bevel gear that rotates integrally with the rotor and has a shaft extending in a front-to-rear direction; a main shaft that is rotated directly or indirectly by the bevel gear and extends in a direction intersecting the front-rear direction; a front end tool holding portion that is rotated by the spindle; a housing for accommodating the bevel gear and the main shaft; and A bearing is held by the housing and rotatably holds the bevel gear.

2. The electric tool according to claim 1, wherein: The electric tool further comprises: a hammer rotated by the spindle; and an anvil, which is struck directly or indirectly by the hammer in the direction of rotation, The front end tool holding portion is arranged at the lower end of the anvil, The housing accommodates the bevel gear, the main shaft, and the hammer.

3. The electric tool according to claim 1, wherein: The rotor has a rotor shaft portion extending in a front-to-rear direction. The rotor shaft portion extends from the motor housing portion toward the interior space of the housing, The bevel gear is fixed to the rotor shaft.

4. The electric tool according to claim 3, wherein: The bearing is in contact with the rotor shaft portion and rotatably holds the bevel gear via the rotor shaft portion.

5. The electric tool according to claim 1, wherein: The housing has a radial support surface that receives a radial load acting on the bearing, and a front support surface that receives a forward thrust load acting on the bearing. The motor housing portion and the housing are connected in the front-to-back direction, The motor housing portion includes a rear support surface that receives a rearward thrust load acting on the bearing.

6. The electric tool according to claim 1, wherein: The electric tool further includes an intermediate shaft disposed between the bevel gear and the main shaft and transmitting the rotation of the bevel gear to the main shaft. The intermediate shaft is accommodated in the housing and extends in a direction intersecting the front-rear direction.

7. The electric tool according to claim 1, wherein: The electric tool further comprises: a first intermediate shaft having a driven gear meshing with the bevel gear and reducing the rotation of the bevel gear; and The second intermediate shaft reduces the speed of rotation of the first intermediate shaft and transmits the reduced speed rotation to the main shaft.

8. The electric tool according to claim 1, wherein: The main axis extends in a direction perpendicular to the front-rear direction.

9. An electric tool, characterized in that: The electric tool comprises: a grip portion extending in a front-to-rear direction; a motor housing portion, which is disposed in front of the grip portion; a motor disposed inside the motor housing and having a stator and a rotor rotatable relative to the stator; a pinion gear that rotates integrally with the rotor; a speed reduction mechanism connected to the pinion; a main shaft connected to the speed reduction mechanism portion and extending in a direction intersecting the front-rear direction; a front end tool holding portion that is rotated by the spindle; a housing that houses the pinion gear, the speed reduction mechanism, and the main shaft; and A bearing is held by the housing and rotatably holds the pinion gear.

10. The electric tool according to claim 9, wherein: The motor housing portion and the housing are connected in the front-to-back direction, The bearing is sandwiched between the motor housing portion and the case.

11. The electric tool according to claim 10, wherein: The housing has a housing recessed portion that is recessed forward from the rear portion of the housing and that accommodates the bearing. The motor housing portion includes a support wall on a front surface of the motor housing portion that directly or indirectly supports a rear surface of the bearing.

12. The electric tool according to claim 9, wherein: The speed reduction mechanism comprises: a first speed reducing portion connected to the pinion gear and configured to reduce the speed of rotation of the pinion gear and rotate the pinion gear; and The second speed reducing portion reduces the speed of the rotation of the first speed reducing portion and transmits the reduced speed to the main shaft.

13. An electric tool, characterized in that: The electric tool comprises: a grip portion extending in a front-to-rear direction; a motor housing portion, which is disposed in front of the grip portion; a motor disposed inside the motor housing and having a stator and a rotor rotatable relative to the stator; a bevel gear that is rotated directly or indirectly by the rotor and has a shaft extending in a front-rear direction; a main shaft that is rotated directly or indirectly by the bevel gear and extends in a direction intersecting the front-rear direction; a front end tool holding portion that is rotated by the spindle; a housing for accommodating the bevel gear and the main shaft; a bearing supported by the housing and rotatably holding the bevel gear; an intermediate support member having a front surface in contact with the bearing; as well as A fixing member contacts the rear surface of the intermediate supporting member and fixes the intermediate supporting member together with the housing by simply sandwiching the intermediate supporting member.

14. The electric tool according to claim 13, wherein: One of the intermediate supporting member and the fixing member elastically deforms the other.

15. The electric tool according to claim 14, wherein: The bearing comprises a ball bearing having an inner ring, an outer ring and balls, The intermediate support member is made of metal and is in contact with the outer ring. The fixing member is made of resin and sandwiches the intermediate supporting member as it elastically deforms.

16. The electric tool according to claim 15, wherein: The radial width of the rear surface of the intermediate support member is larger than the radial width of the outer ring.

17. The electric tool according to claim 14, wherein: The intermediate supporting member is made of resin, The fixing member is made of metal and sandwiches the intermediate supporting member while elastically deforming the intermediate supporting member.

18. The electric tool according to claim 13, wherein: The rotor has a rotor shaft portion extending in a front-to-rear direction. The intermediate support member is provided along the rear surface of the bearing to surround the periphery of the rotor shaft portion and has a C-shape including one end and the other end.

19. The electric tool according to claim 13, wherein: The intermediate support member has an annular shape along a rear surface of the bearing.

20. The electric tool according to claim 13, wherein The fixing member is formed integrally with the motor housing portion.

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