CN118163055A

CN118163055A - Impact wrench

Info

Publication number: CN118163055A
Application number: CN202311662722.9A
Authority: CN
Inventors: 平林德夫; 楠本贵大; 服部智哉
Original assignee: Makita Corp
Current assignee: Makita Corp
Priority date: 2022-12-09
Filing date: 2023-12-06
Publication date: 2024-06-11

Abstract

The present invention provides an impact wrench, comprising: a motor; a main shaft; an anvil having an anvil shaft portion extending in an axial direction parallel to the rotation shaft, and an anvil protrusion protruding from the anvil shaft portion toward a radial outside of the rotation shaft; and a hammer supported by the main shaft. The anvil shaft portion has: a 1 st shaft portion having a circular cross-section perpendicular to the rotation axis; a 2 nd shaft portion which is disposed at a position forward of the 1 st shaft portion and has a square cross-sectional shape; and a transition portion disposed at a position between the 1 st shaft portion and the 2 nd shaft portion. The 2 nd shaft portion has: 4 plane parts and 4 plane part connecting parts. The 4 planes respectively have: a 1 st edge arranged at the 1 st circumferential end of the rotating shaft; and a 2 nd edge disposed at the 2 nd circumferential end of the rotation shaft. The transition portion has a support portion connected to the 1 st edge and is connected to the 2 nd edge at a position further rearward than the support portion.

Description

Impact wrench

Technical Field

The present application relates to an impact wrench.

Background

In the technical field of impact wrenches, there are known: an impact wrench as disclosed in Japanese patent application laid-open No. 2018-187700.

Disclosure of Invention

The impact wrench has: an anvil that is struck in a rotational direction by a hammer. If the durability of the anvil is low, it may cause cracking of the anvil.

The application aims at: the durability of the anvil is improved.

The 1 st aspect of the present application relates to an impact wrench comprising: a motor having a rotor that rotates around a rotation axis extending in the front-rear direction; a main shaft rotated by a rotational force of the rotor; an anvil that is disposed at a position forward of at least a part of the main shaft, and that has an anvil shaft portion extending in an axial direction parallel to the rotation shaft, and an anvil protrusion protruding from the anvil shaft portion toward a radially outer side of the rotation shaft; and a hammer supported by the main shaft and having a hammer protrusion for striking the anvil protrusion in a rotational direction,

Wherein the anvil shaft portion has: a1 st shaft portion having a circular cross-section perpendicular to the rotation axis; a2 nd shaft portion which is disposed further forward than the 1 st shaft portion, and in which the cross-section has a square shape; and a transition portion disposed at a position between the 1 st shaft portion and the 2 nd shaft portion,

The 2 nd shaft portion includes: 4 planar portions and 4 planar portion connecting portions, the 4 planar portions respectively having: a1 st edge disposed at a1 st circumferential end of the rotating shaft; and a2 nd edge disposed at an end portion of the rotation shaft in the 2 nd circumferential direction, the transition portion having: and a support portion connected to the 1 st edge, wherein the transition portion is connected to the 2 nd edge at a position further rearward than the support portion.

A 2 nd aspect of the present application relates to an impact wrench including: a motor having a rotor that rotates around a rotation axis extending in the front-rear direction; a main shaft rotated by a rotational force of the rotor; an anvil that is disposed at a position forward of at least a part of the main shaft, and that has an anvil shaft portion extending in an axial direction parallel to the rotation shaft, and an anvil protrusion protruding from the anvil shaft portion toward a radially outer side of the rotation shaft; and a hammer supported by the main shaft and having a hammer protrusion for striking the anvil protrusion in a rotational direction;

The 2 nd shaft portion includes: 4 planar portions and 4 planar portion connecting portions, the 4 planar portions respectively having: a 1 st edge disposed at a 1 st circumferential end of the rotating shaft; and a 2 nd edge disposed at a 2 nd circumferential end of the rotation shaft,

Regarding the transition portion, in a plane parallel to the planar portion, a shape of a 1 st portion which is on a 1 st circumferential side from a center line of the planar portion in a circumferential direction and is connected to the 1 st edge is different from: a shape of a 2 nd portion located on a 2 nd circumferential side with respect to the center line and connected to the 2 nd edge.

An aspect 3 of the present application relates to an impact wrench including: a motor having a rotor that rotates around a rotation axis extending in the front-rear direction; a main shaft rotated by a rotational force of the rotor; an anvil that is disposed at a position forward of at least a part of the main shaft, and that has an anvil shaft portion extending in an axial direction parallel to the rotation shaft, and an anvil protrusion protruding from the anvil shaft portion toward a radially outer side of the rotation shaft; a hammer supported by the main shaft and having a hammer protrusion for striking the anvil protrusion in a rotational direction; and an anvil bearing supporting the anvil,

The 2 nd shaft portion includes: 4 planar portions and 4 planar portion connecting portions, the anvil having: the transition part is a1 st anvil of a1 st shape and the transition part is a2 nd anvil of a2 nd shape,

The 1 st anvil and the 2 nd anvil can be replaced relative to the anvil bearing.

Advantageous effects according to the present application, the durability of the anvil can be improved.

Drawings

Fig. 1 is a perspective view of the impact tool of embodiment 1 as seen from the front right.

Fig. 2 is a side view of the impact tool of embodiment 1.

Fig. 3 is a longitudinal sectional view of an upper portion of the impact tool of embodiment 1.

Fig. 4 is a transverse cross-sectional view of an upper portion of the impact tool of embodiment 1.

Fig. 5 is an enlarged longitudinal sectional view of a part of the impact tool according to embodiment 1.

Fig. 6 is an exploded perspective view of the impact tool of embodiment 1 as seen from the front right.

Fig. 7 is a perspective view of the anvil of embodiment 1, seen from the front right.

Fig. 8 is a side view of the anvil of embodiment 1.

Fig. 9 is a view of the anvil of embodiment 1 from the front.

Fig. 10 is an enlarged view of a part of the anvil of embodiment 1.

Fig. 11 is a side view of an anvil of embodiment 2.

Fig. 12 is an enlarged view of a part of the anvil of embodiment 2.

Fig. 13 is a side view of the anvil of embodiment 3.

Fig. 14 is a side view of the anvil of embodiment 4.

Fig. 15 is an enlarged view of a part of the anvil of embodiment 4.

Fig. 16 is a side view of the anvil of embodiment 5.

Fig. 17 is a perspective view of the anvil of embodiment 6 as seen from the front right.

Fig. 18 is a perspective view of the anvil of embodiment 6 as seen from the rear left.

Fig. 19 is a side view of the anvil of embodiment 6.

Fig. 20 is a cross-sectional view of the anvil of embodiment 6.

Fig. 21 is an enlarged view of a part of the anvil of embodiment 6.

Fig. 22 is a perspective view of the anvil of embodiment 7 as seen from the front right.

Fig. 23 is a perspective view of the anvil of embodiment 7 as seen from the rear left.

Fig. 24 is a side view of the anvil of embodiment 7.

Fig. 25 is a cross-sectional view of the anvil of embodiment 7.

Fig. 26 is an enlarged view of a part of the anvil of embodiment 7.

Fig. 27 is a perspective view of the anvil of embodiment 8 as seen from the front right.

Fig. 28 is a perspective view of the anvil of embodiment 8 viewed from the rear left.

Fig. 29 is a side view of the anvil of embodiment 8.

Fig. 30 is a cross-sectional view of the anvil of embodiment 8.

Fig. 31 is a perspective view of the anvil of embodiment 9 as seen from the right front side.

Fig. 32 is a perspective view of the anvil of embodiment 9 as seen from the rear left.

Fig. 33 is a side view of the anvil of embodiment 9.

Fig. 34 is a cross-sectional view of the anvil of embodiment 9.

Fig. 35 is a perspective view of the anvil of embodiment 10 as seen from the front right.

Fig. 36 is a perspective view of the anvil of embodiment 10 from the rear left.

Fig. 37 is a side view of the anvil of embodiment 10.

Fig. 38 is a cross-sectional view of the anvil of embodiment 10.

Fig. 39 is a perspective view of the anvil of embodiment 11 as seen from the front right.

Fig. 40 is a perspective view of the anvil of embodiment 11 as seen from the rear left.

Fig. 41 is a side view of the anvil of embodiment 11.

Fig. 42 is a cross-sectional view of the anvil of embodiment 11.

Fig. 43 is a perspective view of the anvil of embodiment 12 as seen from the front right.

Fig. 44 is a perspective view of the anvil of embodiment 12 as seen from the rear left.

FIG. 45 is a side view of the anvil of embodiment 12.

Fig. 46 is a cross-sectional view of the anvil of embodiment 12.

Fig. 47 is a perspective view of the anvil of embodiment 13 as seen from the front right.

Fig. 48 is a perspective view of the anvil of embodiment 13 as seen from the rear left.

Fig. 49 is a side view of the anvil of embodiment 13.

Fig. 50 is a cross-sectional view of the anvil of embodiment 13.

Fig. 51 is a perspective view of the anvil of embodiment 14 as seen from the front right.

Fig. 52 is a perspective view of the anvil of embodiment 14, viewed from the rear left.

Fig. 53 is a side view of the anvil of embodiment 14.

Fig. 54 is a cross-sectional view of the anvil of embodiment 14.

Fig. 55 is a perspective view of the anvil of embodiment 15 as seen from the front right.

Fig. 56 is a perspective view of the anvil of embodiment 15 as seen from the rear left.

Fig. 57 is a side view of the anvil of embodiment 15.

Fig. 58 is a cross-sectional view of the anvil of embodiment 15.

Fig. 59 is a diagram for explaining an anvil group according to embodiment 16.

Fig. 60 is a diagram for explaining an anvil group according to embodiment 16.

Fig. 61 is a diagram for explaining a main shaft and an anvil according to embodiment 17.

Description of the reference numerals

1 … Impact tools (impact wrenches); 2 … housings; 2L … left shell; 2R … right housing; 2S … screws; 2T … screws; 3 … covers; 4 … hammer housing; 6 … motors; 7 … speed reducing mechanism parts; 8 … spindle; 9 … striking mechanism parts; 10 … anvil; 10N1 … anvil; 10R1 … anvil; 10N2 … anvil; 10R2 … anvil; 10N3 … anvil; 10R3 … anvil; 10N4 … anvil; 10R4 … anvil; 10N5 … anvil; 10R5 … anvil; 12 … fans; 13 … battery mounting portions; 14 … trigger shift; 15 … forward and reverse rotation shift gear; 16 … operation display section; 16a … operation buttons; 16B … indicator display; 17 … lamps; 19 … air inlets; 20 … exhaust ports; 21 … motor housing parts; 22 … grip; 23 … battery holding parts; 24 … bearing housing; 25 … battery packs; 26 … stators; 27 … rotors; 28 … stator cores; 29 … front insulators; 30 … post insulators; 31 … coils; 32 … rotor cores; 33 … rotor shafts; 34 … rotor magnets; 37 … sensor substrates; 38 … busbar units; 39 … rotor bearings; 39F … front side rotor bearings; 39R … rear rotor bearings; 41 … pinion gear; 42 … planetary gears; 42P … pin; 43 … inner gear; 44 … spindle bearings; 46 … anvil bearings; 47 … hammers; 48 … hammer balls; a 50 … coil spring; 51 … 1 st coil spring; 52 … nd coil spring; 53 … washers; 54 … support balls; 61 … washers; 62 … washers; 70 … seal members; 71 … outer ring portion; 72 … rear lip; 73 … front lip; 80 … support members; 85 … ring springs; 101 … anvil shaft portion; 101N1 … anvil shaft portion; 101R1 … anvil shaft portion; 101N2 … anvil shaft portion; 101R2 … anvil shaft portion; 101N3 … anvil shaft portion; 101R3 … anvil shaft portion; 101N4 … anvil shaft portion; 101R4 … anvil shaft portion; 101N5 … anvil shaft portion; 101R5 … anvil shaft portion; 102 … anvil projections; 103 … recess; 104 … convex portions; 110 … (1 st) th shaft portion; a 111 … recess; 112 … rear cylindrical portion; 113 … recess; 114 … front cylindrical portion; 120 … nd shaft portion; 121 … planar portions; 121a … planar portion; 121B … planar portions; 121C … planar portion; 121D … planar portion; 122 … planar portion connections; 122a … planar portion connection; 122B … planar portion connection; 122C … planar portion connections; 122D … planar portion connection; 123 … recess; 123a … front edge; 123B … trailing edge; 124 … 1 st edge; 125 … nd edge; 126 … projections; 130 … transitions; 130N … transition portion (transition portion for normal rotation); 130R … transition portion (transition portion for inversion); 131 … support portions; 131a … support; 131B … support; 131C … support; 131D … support; 132 … curved portions; 133 … curve; 134 … taper; 135 … connections; 140 … front end portions; 140a … recess; 150 … middle part; 241 … recess; 242 … recess; 300 … socket; 301 … pin holes; 302 … pin holes; 303 … accommodating holes; 401 … 1 st barrel portion; 402 … nd barrel portion; 402R … rear surface; 402S … inner peripheral surfaces; 403 … housing connections; 404 … 3 rd barrel portion; 404R … rear surface; 404S … inner peripheral surface; 405 … th barrel portion 4; 405R … rear surface; 405S … inner peripheral surfaces; 461 … outer ring portion; 461F … front surface; 461R … rear surface; 461S … inner peripheral surfaces; 461T … outer peripheral surfaces; 462 … rear side support; 462F … front face; 462R … back surface; 462S … inner peripheral surfaces; 463 … front side support portion; 463F … front face; 463R … rear face; 463S … inner peripheral surfaces; 464 … rear-side projections; 464R … rear surface; 464T … outer circumference; 465 … front side lobes; 465F … front face; 465S … inner peripheral surface; 465T … outer peripheral surface; 466 … concave part; 471 … base parts; 473 … posterior annulus; 474 … support ring portion; 474a … large diameter portion; 474B … small diameter portion; 474C … steps; 475 … hammer projections; 476 … recesses; 477 … hammer grooves; 478 … support slots; 801 … spindle shaft portion; 802 … flange portions; 803 … convex portions; 804 … spindle grooves; 805 … recesses; 1010 … anvil; 1101 … anvil shaft portion; part 1 of 1301 …; part 2 of 1302 …;2010 … anvil; 2101 … anvil shaft portion; 3010 … anvil; 3101 … anvil shaft portion; AX … rotation axis; CX … centerline.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. In the embodiment, the positional relationship of each part will be described using terms such as front, rear, left, right, upper, and lower. The above expression means: relative position or orientation with respect to the center of the impact tool 1. The impact tool 1 has: a motor 6 as a power source.

In the embodiment, the direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as: axial direction. The direction around the circumference of the rotation axis AX is appropriately referred to as: the radial direction of the rotation axis AX is appropriately referred to as the circumferential direction or rotation direction: radial direction.

The rotation axis AX extends in the front-rear direction. The 1 st axial direction is the front, and the 2 nd axial direction is the rear. In the radial direction, the position closer to the rotation axis AX or the direction closer to the rotation axis AX is appropriately referred to as: radially inward, a position farther from the rotation axis AX or a direction away from the rotation axis AX is appropriately referred to as: radially outward.

[ Embodiment 1]

< Impact tool >

Fig. 1 is a perspective view of an impact tool 1 of the present embodiment as seen from the front right. Fig. 2 is a side view of the impact tool 1. Fig. 3 is a longitudinal sectional view of the upper part of the impact tool 1. Fig. 4 is a transverse sectional view of the upper part of the impact tool 1. Fig. 5 is a longitudinal sectional view of a part of the impact tool 1 enlarged. Fig. 6 is an exploded perspective view of the impact tool 1 from the front right.

The impact tool 1 of the embodiment is an impact wrench. The impact tool 1 has: the housing 2, the hammer case 4, the cover 3, the motor 6, the reduction mechanism 7, the spindle 8, the striking mechanism 9, the anvil 10, the fan 12, the battery mounting portion 13, the trigger gear 14, the forward/reverse rotation switching gear 15, the operation display portion 16, the lamp 17, the seal member 70, and the support member 80.

The housing 2 is made of synthetic resin. The housing 2 of the embodiment is made of nylon. The housing 2 has: left housing 2L and right housing 2R. The right housing 2R is configured to: the right position of the left housing 2L. The left case 2L and the right case 2R are fixed by a plurality of screws 2S. The housing 2 is constituted by a pair of half-cut housings.

The housing 2 has: a motor housing portion 21, a grip portion 22, and a battery holding portion 23.

The motor housing 21 houses the motor 6. The motor housing 21 and the hammer case 4 are fixed by a plurality of screws 2T.

The grip 22 is gripped by the operator. The grip 22 extends downward from the motor housing 21. The trigger gear 14 is provided to: an upper portion of the grip 22.

The battery holding unit 23 holds the battery pack 25 via the battery mounting unit 13. The battery holding portion 23 is connected to the lower end portion of the grip portion 22. The external dimensions of the battery holding portion 23 are larger than the external dimensions of the grip portion 22 in the front-rear direction and the left-right direction, respectively.

The motor housing portion 21 includes: an intake port 19 and an exhaust port 20. The exhaust port 20 is provided in: and is positioned further forward than the air intake 19. Air in the outer space of the housing 2 flows into the inner space of the housing 2 through the air inlet 19 and flows out to the outer space of the housing 2 through the air outlet 20.

The hammer case 4 accommodates at least a part of the reduction mechanism 7, the main shaft 8, the striking mechanism 9, and the anvil 10. At least a part of the speed reduction mechanism 7 is disposed in: the bearing housing 24 is located at an inboard position. The reduction mechanism 7 has a plurality of gears.

The hammer housing 4 is made of metal. The hammer housing 4 of the embodiment is made of aluminum. The hammer housing 4 is cylindrical. The hammer housing 4 is connected to the front of the motor housing 21. A bearing housing 24 is fixed to the rear of the hammer housing 4. The bearing housing 24 is fixed to the hammer housing 4 by fitting the front portion of the bearing housing 24 into the rear portion of the hammer housing 4.

The cover 3 covers at least a portion of the outer surface of the hammer housing 4.

The motor 6 is the power source of the impact tool 1. The motor 6 is an inner rotor type brushless motor. The motor 6 includes: a stator 26 and a rotor 27. The stator 26 is supported by the motor housing 21. At least a portion of the rotor 27 is configured to: the inside position of the stator 26. The rotor 27 rotates with respect to the stator 26. The rotor 27 rotates about a rotation axis AX extending in the front-rear direction.

The speed reduction mechanism 7 connects the rotor 27 to the spindle 8. The speed reduction mechanism 7 transmits the rotation of the rotor 27 to the spindle 8. The speed reduction mechanism 7 rotates the main shaft 8 at a rotation speed lower than the rotation speed of the rotor 27. The speed reduction mechanism 7 is disposed in: the motor 6 is located further forward. The speed reduction mechanism 7 has a planetary gear mechanism. The reduction mechanism 7 has a plurality of gears. The gear of the reduction mechanism 7 is driven by the rotor 27.

The spindle 8 rotates by the rotational force of the rotor 27 transmitted from the speed reduction mechanism 7. The spindle 8 is disposed: and is positioned further forward than at least a portion of the motor 6. The spindle 8 is disposed: and is positioned further forward than the stator 26. At least a portion of the spindle 8 is configured to: and is positioned further forward than the rotor 27. At least a portion of the spindle 8 is configured to: the front position of the speed reducing mechanism 7. The spindle 8 is disposed: the rear position of the anvil 10.

The striking mechanism 9 strikes the anvil 10 in the rotation direction based on the rotation force of the main shaft 8 rotated by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the reduction mechanism 7 and the spindle 8.

The anvil 10 is: an output shaft of the impact tool 1 that rotates based on the rotational force of the rotor 27. The anvil 10 is struck in the rotation direction by the striking mechanism portion 9. The anvil 10 is configured to: the motor 6 is located further forward. The anvil 10 is provided with: as a kind of nipple for the nose tool. The anvil 10 is configured to: and is positioned further forward than at least a portion of the main shaft 8.

The fan 12 generates: for cooling the motor 6. The fan 12 is configured to: and is positioned further forward than the stator 26 of the motor 6. The fan 12 is fixed to: at least a portion of the rotor 27. The fan 12 rotates to allow air in the outside space of the casing 2 to flow into the inside space of the casing 2 through the air inlet 19, thereby cooling the motor 6. The air flowing through the inner space of the casing 2 is rotated by the fan 12, and flows out to the outer space of the casing 2 through the exhaust port 20.

The battery mounting portion 13 is connected to the battery pack 25. The battery pack 25 is detachably mounted to the battery mounting portion 13. The battery mounting portion 13 is disposed: a lower portion of the battery holding portion 23. The battery pack 25 is inserted into the battery mounting portion 13 from the front of the battery holding portion 23, and is mounted on the battery mounting portion 13. The battery pack 25 is removed from the battery mounting portion 13 by being pulled out from the battery mounting portion 13 toward the front. The battery pack 25 has a secondary battery. The battery pack 25 of the embodiment has rechargeable lithium ion batteries. The battery pack 25 is mounted on the battery mounting portion 13, and thereby supplies power to the impact tool 1. The motor 6 is driven based on electric power supplied from the battery pack 25.

The trigger shift 14 is operated by the operator to start the motor 6. The driving and stopping of the motor 6 are switched by the trigger shift 14. The trigger shifter 14 is provided to the grip 22.

The forward/reverse shift lever 15 is operated by the operator. The forward/reverse shift lever 15 is used to switch the rotation direction of the motor 6 to the forward/reverse direction. Accordingly, the rotation direction of the spindle 8 is switched. The forward/reverse rotation switching gear 15 is provided at an upper portion of the grip portion 22.

The operation display unit 16 includes: a plurality of operation buttons 16A and an indicator display 16B. The operation mode of the motor 6 is switched by the operator operating the operation button 16A. The indicator display 16B has a plurality of light emitting portions. The indicator display 16B displays the operation mode of the motor 6 by changing the lighting pattern of the plurality of light emitting units. The operation display unit 16 is provided in the battery holding unit 23. The operation display unit 16 is provided on the upper surface of the battery holding unit 23 at a position forward of the grip unit 22.

The lamp 17 irradiates illumination light. The lamp 17 illuminates the anvil 10 and the periphery of the anvil 10 with illumination light. The lamp 17 illuminates the front of the anvil 10 with illumination light. The lamp 17 illuminates the distal end tool attached to the anvil 10 and the periphery of the distal end tool with illumination light. The lamp 17 is arranged: the trigger gear 14 is in an up position.

The hammer housing 4 has: a1 st barrel 401, a2 nd barrel 402, a housing connection 403, a 3 rd barrel 404, and a 4 th barrel 405. The 1 st barrel 401 is disposed in: around the striking mechanism portion 9. The 2 nd barrel 402 is disposed: a position forward of the 1 st cylinder 401. The outer diameter of the 2 nd barrel portion 402 is smaller than the outer diameter of the 1 st barrel portion 401. The case connecting portion 403 connects the front portion of the 1 st cylinder 401 and the rear portion of the 2 nd cylinder 402. The 3 rd cylinder 404 is disposed: a position forward of the 2 nd cylinder 402. The 4 th barrel 405 is disposed: and is located further forward than the 3 rd cylinder 404. The inner diameter of the 2 nd barrel portion 402 is smaller than the inner diameter of the 1 st barrel portion 401. The inner diameter of the 3 rd barrel portion 404 is smaller than the inner diameter of the 2 nd barrel portion 402. The inner diameter of the 4 th barrel portion 405 is smaller than the inner diameter of the 3 rd barrel portion 404.

As shown in fig. 5, the 2 nd barrel 402 has: a rear surface 402R facing rearward, and an inner peripheral surface 402S facing radially inward. The 3 rd cylinder 404 has: a rear surface 404R facing rearward, and an inner peripheral surface 404S facing radially inward. The 4 th barrel 405 has: a rear surface 405R facing rearward, and an inner peripheral surface 405S facing radially inward. The front end portion of the inner peripheral surface 402S is connected to the radially outer end portion of the rear surface 404R. The front end of the inner peripheral surface 404S is connected to the radially outer end of the rear surface 405R. The inner peripheral surface 405S defines: an opening of the hammer housing 4 provided at a front end portion of the hammer housing 4.

The motor 6 includes: a stator 26 and a rotor 27. The stator 26 has: a stator core 28, a front insulator 29, a rear insulator 30, and a plurality of coils 31. The rotor 27 rotates about the rotation axis AX. The rotor 27 has: rotor core 32, rotor shaft 33, and rotor magnet 34.

The stator core 28 is disposed: is located radially outward of the rotor 27. The stator core 28 includes: a plurality of steel plates laminated. The steel plate is as follows: a metal plate containing iron as a main component. The stator core 28 has a cylindrical shape. The stator core 28 includes: a plurality of teeth for supporting the coil 31.

The front insulator 29 is provided with: the front portion of the stator core 28. The rear insulator 30 is provided with: the rear portion of the stator core 28. The front insulator 29 and the rear insulator 30 are respectively: an electrical insulating member made of synthetic resin. The front insulator 29 covers a portion of the surface of the tooth. The rear insulator 30 covers a portion of the surface of the tooth.

The coil 31 is mounted on the stator core 28 via the front insulator 29 and the rear insulator 30. The coil 31 is disposed around the teeth of the stator core 28 via the front insulator 29 and the rear insulator 30. The coil 31 and the stator core 28 are electrically insulated by the front insulator 29 and the rear insulator 30. The plurality of coils 31 are connected by means of a busbar unit 38.

The rotor core 32 and the rotor shaft 33 are each made of steel. The rotor shaft 33 is disposed: the inner side position of the rotor core 32. The rotor core 32 and the rotor shaft 33 are fixed. The front end portion of the rotor shaft 33 protrudes forward from the front end surface of the rotor core 32. The rear end portion of the rotor shaft 33 protrudes rearward from the rear end surface of the rotor core 32.

The rotor magnet 34 is fixed to the rotor core 32. The rotor magnet 34 is disposed inside the rotor core 32.

A sensor substrate 37 is mounted on the rear insulator 30. The sensor substrate 37 includes: a circuit substrate and a rotation detecting element. The circuit substrate is: a disk shape with a hole in the center. The rotation detecting element is supported by the circuit board. At least a part of the sensor substrate 37 faces the rotor magnet 34. The rotation detecting element detects the position of the rotor magnet 34, thereby detecting the position of the rotor 27 in the rotation direction.

The rotor shaft 33 is rotatably supported by a rotor bearing 39. The rotor bearing 39 has: a front rotor bearing 39F and a rear rotor bearing 39R. The front rotor bearing 39F rotatably supports the front end portion of the rotor shaft 33. The rear rotor bearing 39R rotatably supports the rear end portion of the rotor shaft 33.

The front rotor bearing 39F is held in the bearing housing 24. The bearing housing 24 has a recess 241. The concave portion 241 is recessed toward the front from the rear surface of the bearing housing 24. The front rotor bearing 39F is disposed in the recess 241. The rear rotor bearing 39R is held by: the rear of the motor housing 21. The front end portion of the rotor shaft 33 is disposed in the internal space of the hammer case 4 through the opening of the bearing housing 24.

The fan 12 is fixed to: a front portion of the rotor shaft 33. The fan 12 is configured to: a position between the front rotor bearing 39F and the stator 26. The fan 12 is rotated together with the rotor shaft 33 by the rotation of the rotor shaft 33.

A pinion 41 is formed at the tip end of the rotor shaft 33. The pinion 41 is coupled to at least a part of the reduction mechanism 7. The rotor shaft 33 is coupled to the reduction mechanism 7 via a pinion gear 41.

The speed reduction mechanism 7 includes: a plurality of planetary gears 42 and an internal gear 43. The plurality of planetary gears 42 are arranged: around the pinion 41. The internal gear 43 is disposed: around the plurality of planetary gears 42. The pinion gear 41, the planetary gear 42, and the internal gear 43 are housed in the hammer case 4, respectively. A plurality of planetary gears 42 are respectively meshed with the pinion gears 41. The planetary gear 42 is rotatably supported by the main shaft 8 via a pin 42P. The spindle 8 rotates via the planetary gear 42. The internal gear 43 has: internal teeth meshed with the planetary gears 42. The internal gear 43 is fixed to the hammer housing 4. The internal gear 43 cannot always rotate relative to the hammer housing 4.

When the rotor shaft 33 is rotated by the driving of the motor 6, the pinion gear 41 is rotated, and the planetary gear 42 revolves around the pinion gear 41. The planetary gear 42 revolves while meshing with the internal teeth of the internal gear 43. Accordingly, the main shaft 8 connected to the planetary gear 42 via the pin 42P rotates at a rotation speed lower than the rotation speed of the rotor shaft 33.

The spindle 8 is rotated by the rotational force of the motor 6. The spindle 8 transmits the rotational force of the motor 6 to the anvil 10 via the striking mechanism 9. The striking mechanism 9 rotates by the rotational force of the rotor 27. The spindle 8 has: a spindle shaft portion 801 and a flange portion 802. The flange portion 802 is provided with: the rear of the spindle shaft 801. The planetary gear 42 is rotatably supported by the flange 802 via a pin 42P. The rotation axis of the spindle 8 coincides with the rotation axis AX of the motor 6. The spindle 8 rotates about the rotation axis AX. The spindle 8 is rotatably supported by a spindle bearing 44. The spindle 8 has a convex 803 at the rear end. The convex 803 protrudes rearward from the flange 802. The spindle bearing 44 surrounds the protrusion 803.

The bearing housing 24 is arranged to: at least a part of the circumference of the spindle 8. The spindle bearing 44 is held in the bearing housing 24. The bearing housing 24 has a recess 242. The recess 242 is recessed rearward from the front surface of the bearing housing 24. The spindle bearing 44 is disposed in the recess 242.

The striking mechanism 9 includes: hammer 47, hammer ball 48, coil spring 50, and washer 61. The striking mechanism 9 is housed in: the 1 st barrel portion 401 of the hammer housing 4. The 1 st barrel 401 is disposed in: around the hammer 47.

The hammer 47 is configured to: a position forward of the speed reduction mechanism 7. The hammer 47 is configured to: around the spindle shaft 801. The hammer 47 is supported on the spindle shaft 801.

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

The hammer 47 has: a base portion 471, a rear ring portion 473, a support ring portion 474, and a hammer projection 475.

The base 471 is arranged: around the spindle shaft 801. The base 471 is annular. The spindle shaft 801 is disposed in: an inner side position of the base part 471.

The rear ring part 473 protrudes rearward from the outer peripheral part of the base part 471. The rear ring part 473 is cylindrical. The rear end portion of the rear ring portion 473 is arranged: and is positioned further rearward than the rear end of the support ring 474.

The support ring 474 protrudes rearward from the inner peripheral portion of the base 471. The support ring 474 is cylindrical. The support ring 474 is arranged to: around the spindle shaft 801. The support ring 474 is supported on the spindle shaft 801 by the hammer balls 48. The support ring portion 474 has: large diameter portion 474A and small diameter portion 474B. The small diameter portion 474B is arranged in: and is located further rearward than the large diameter portion 474A. The outer diameter of the large diameter portion 474A is larger than the outer diameter of the small diameter portion 474B. A step 474C is provided at the boundary between the large diameter portion 474A and the small diameter portion 474B.

The hammer projection 475 projects forward from the front surface of the base 471. The front surface of the hammer projection 475 is configured to: and is positioned further forward than the front surface of the base 471. The 2 hammer projections 475 are arranged along the circumferential direction.

The recess 476 is formed by the rear surface of the base portion 471, the inner circumferential surface of the rear side ring portion 473, and the outer circumferential surface of the support ring portion 474. The recess 476 is provided in: the rear of the hammer 47. The recess 476 is recessed from the rear surface of the hammer 47 toward the front.

The hammer ball 48 is made of metal such as steel. The hammer ball 48 is disposed: a position between the spindle shaft 801 and the hammer 47. The spindle 8 has a spindle groove 804. At least a portion of the hammer ball 48 is disposed in the spindle slot 804. The spindle groove 804 is provided in: a part of the outer peripheral surface of the spindle shaft 801. The hammer 47 has a hammer slot 477. At least a portion of the hammer ball 48 is disposed in the hammer groove 477. Hammer slot 477 is provided in: a portion of the inner peripheral surface of the support ring portion 474. The hammer ball 48 is disposed: a position between the spindle slot 804 and the hammer slot 477. The hammer balls 48 roll inside the spindle groove 804 and inside the hammer groove 477, respectively. The hammer 47 can move along with the hammer ball 48. The spindle 8 and the hammer 47 are movable relative to each other in the axial direction and the rotational direction within a movable range defined by the spindle groove 804 and the hammer groove 477.

The coil spring 50 is disposed: around the spindle shaft 801. The coil spring 50 of the embodiment includes: the 1 st coil spring 51 and the 2 nd coil spring 52 are arranged in parallel with each other. The 2 nd coil spring 52 is disposed: the 1 st coil spring 51 is located radially inward. The spring constant of the 1 st coil spring 51 of the embodiment is larger than the spring constant of the 2 nd coil spring 52. The wire diameter of the 1 st coil spring 51 is larger than the wire diameter of the 2 nd coil spring 52.

The rear end portion of the 1 st coil spring 51 and the rear end portion of the 2 nd coil spring 52 are supported by: the front surface of the flange portion 802. The rear end portion of the 1 st coil spring 51 is in contact with the front surface of the flange portion 802. The rear end portion of the 2 nd coil spring 52 is supported by the front surface of the flange portion 802 via the washer 62.

The distal end portion of the 1 st coil spring 51 and the distal end portion of the 2 nd coil spring 52 are disposed: the inside position of the recess 476. Inside the recess 476, a gasket 61 is arranged. The front end portion of the 1 st coil spring 51 and the front end portion of the 2 nd coil spring 52 are supported by a washer 61. The gasket 61 is an annular member. The 1 st coil spring 51 and the 2 nd coil spring 52 each always generate: and an elastic force for moving the hammer 47 forward.

The gasket 61 is disposed: a rear position of the base 471. The washer 61 supports the distal end portion of the 1 st coil spring 51 and the distal end portion of the 2 nd coil spring 52. In the radial direction, the gasket 61 is arranged: a position between the rear ring part 473 and the support ring part 474. The gasket 61 is disposed: the inside position of the recess 476. The washer 61 is supported by the hammer 47 via a plurality of support balls 54. When the hammer 47 is disposed at the forefront position within the movable range of the hammer 47 in the front-rear direction, the support ball 54 is disposed at: and is located further forward than the rear end of the hammer ball 48.

The support balls 54 are disposed in the support groove 478. The support groove 478 is provided inside the recess 476 in the hammer 47. The support groove 478 of the present embodiment is provided in: a rear surface of the base part 471. The support groove 478 is annular surrounding the rotation axis AX. The support ball 54 supports the washer 61.

The washer 61 is sandwiched between the coil spring 50 and the support ball 54 in the front-rear direction. The washer 61 is separate from the hammer 47 and the spindle 8.

The anvil 10 has: anvil shaft portion 101, anvil protrusion 102, and recess 103.

The anvil shaft portion 101 extends in the axial direction (front-rear direction). The anvil shaft portion 101 has a rotation axis AX. The anvil shaft portion 101 is arranged: and is positioned further forward than the spindle 8 and the hammer 47. At least a portion of the anvil shaft portion 101 is configured to: an opening provided at the front end portion of the hammer housing 4. As described above, the opening of the front end portion of the hammer case 4 is defined by the inner peripheral surface 405S of the 4 th barrel portion 405. The front end portion of the anvil shaft portion 101 protrudes forward from the opening of the hammer case 4. A nipple as a type of nose tool is fitted to: the front end of the anvil shaft 101.

The anvil protruding portion 102 protrudes radially outward from the rear end portion of the anvil shaft portion 101. The anvil projection 102 is struck in the rotational direction by the hammer projection 475. A washer 53 is disposed between the front surface of the anvil protrusion 102 and the rear surface 402R of the 2 nd barrel 402. The washer 53 inhibits contact between the anvil projection 102 and the 2 nd barrel 402. The rear end portion of the 2 nd barrel 402 receives the load of the anvil protrusion 102 via the washer 53.

The recess 103 is recessed toward the front from the central portion of the rear surface of the anvil 10. The tip of the spindle 8 is disposed in the recess 103.

The base 471 is arranged: and further rearward than anvil projection 102. The rear surface of the anvil projection 102 is separated from the front surface of the base part 471.

Anvil 10 is rotatably supported by anvil bearing 46. The rotation axis of the anvil 10, the rotation axis of the hammer 47, the rotation axis of the spindle 8, and the rotation axis AX of the motor 6 coincide. The anvil 10 rotates about the rotation axis AX. Anvil bearing 46 is configured to: around the anvil shaft portion 101. A portion of anvil bearing 46 is configured to: the inside position of the 2 nd barrel portion 402 of the hammer housing 4. A portion of anvil bearing 46 is configured to: the inside position of the 3 rd barrel portion 404 of the hammer housing 4. Anvil bearing 46 is held in: the 2 nd barrel portion 402 of the hammer housing 4. Anvil bearing 46 is pressed into barrel 2 402. The anvil bearing 46 is fixed to the hammer housing 4 inside the hammer housing 4. Anvil bearing 46 rotatably supports anvil shaft 101.

As shown in fig. 5, the anvil bearing 46 has: an outer ring portion 461, a rear side supporting portion 462, a front side supporting portion 463, a rear side convex portion 464, and a front side convex portion 465. The rear side bearing 462 protrudes radially inward from the rear of the outer ring portion 461. The front side support portion 463 protrudes radially inward from the front of the outer ring portion 461. The rear convex portion 464 protrudes rearward from the rear support portion 462. The front side projection 465 projects forward from the front side support 463. The recess 466 of the anvil bearing 46 is defined by the outer ring portion 461, the rear side support portion 462, and the front side support portion 463.

The outer ring portion 461 has: a front surface 461F facing forward, a rear surface 461R facing rearward, an inner peripheral surface 461S facing radially inward, and an outer peripheral surface 461T facing radially outward.

The rear support 462 includes: a front surface 462F facing forward, a rear surface 462R facing rearward, and an inner peripheral surface 462S facing radially inward.

The front support 463 includes: a front surface 463F facing forward, a rear surface 463R facing rearward, and an inner peripheral surface 463S facing radially inward.

The rear-side convex portion 464 has: a rear surface 464R facing rearward, and an outer peripheral surface 464T facing radially outward.

The front side convex portion 465 includes: a front surface 465F facing forward, an inner peripheral surface 465S facing radially inward, and an outer peripheral surface 465T facing radially outward.

The outer circumferential surface 461T of the outer ring portion 461 is in contact with the inner circumferential surface 402S of the 2 nd barrel portion 402. The inner peripheral surface 461S of the outer ring portion 461 is separated from the outer peripheral surface of the anvil shaft portion 101. The concave portion 466 is defined by the inner peripheral surface 461S of the outer ring portion 461, the front surface 462F of the rear support portion 462, and the rear surface 463R of the front support portion 463.

As will be described later, the anvil shaft portion 101 includes: a rear cylindrical portion 112, a front cylindrical portion 114, and a concave portion 113. The inner peripheral surface 461S of the outer ring portion 461 is opposed to the outer peripheral surface of the recess 113. The inner peripheral surface 462S of the rear support portion 462 contacts the outer peripheral surface of the rear cylindrical portion 112. An inner peripheral surface 463S of the front support portion 463 contacts an outer peripheral surface of the front cylindrical portion 114.

The radially outer peripheral portion of the front surface of the washer 53 is opposed to the rear surface 402R of the 2 nd cylinder 402. An inner edge portion of the front surface of the washer 53 on the radially inner side is opposed to the rear surface 461R of the outer ring portion 461. The inner peripheral surface of the washer 53 facing radially inward is opposed to the outer peripheral surface 464T of the rear-side projection 464. The rear surface 464R of the rear projection 464 faces the front surface of the anvil projection 102 with a gap therebetween. The front surface 461F of the outer ring portion 461 is opposite to the rear surface 404R of the 3 rd barrel portion 404. The outer peripheral surface 465T of the front side projection 465 contacts the inner peripheral surface 404S of the 3 rd cylinder 404.

The hammer projection 475 is configured to contact the anvil projection 102. In a state where the hammer 47 is in contact with the anvil projection 102, the anvil 10 is rotated together with the hammer 47 and the spindle 8 by driving the motor 6.

The anvil 10 is struck in the direction of rotation by a hammer 47. For example, in the bolt tightening operation, if the load acting on the anvil 10 becomes high, the anvil 10 may not be rotated by the load of the coil spring 50 alone. Thus, the rotation of the anvil 10 and the hammer 47 is stopped. The spindle 8 and the hammer 47 are relatively movable in the axial direction and the circumferential direction by means of the hammer balls 48, respectively. Even if the rotation of the hammer 47 is stopped, the rotation of the spindle 8 is continued by the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the hammer balls 48 move rearward while being guided by the spindle groove 804 and the hammer groove 477. The hammer 47 receives force from the hammer ball 48, and moves rearward with the hammer ball 48. That is, in a state where the rotation of the anvil 10 is stopped, the spindle 8 rotates, and the hammer 47 moves rearward. Accordingly, the contact between the hammer 47 and the anvil protrusion 102 is released.

When the hammer 47 moves rearward, the hammer 47 rotates relative to the spindle shaft 801. The washer 61 is separate from the hammer 47 and the spindle 8. Thus, the rotation of the hammer 47 is not impeded by the washer 61. Further, a support ball 54 is disposed between the washer 61 and the hammer 47. The hammer 47 can be smoothly rotated by rotating the support ball 54.

As described above, the coil spring 50 always generates: and an elastic force for moving the hammer 47 forward. The hammer 47 moved rearward is moved forward by the elastic force of the coil spring 50. When the hammer 47 moves forward, a force in the rotational direction is received from the hammer ball 48. That is, the hammer 47 moves forward while rotating. Then, the hammer projection 475 contacts the anvil projection 102 while rotating. Accordingly, the anvil protrusion 102 is struck in the rotational direction by the hammer protrusion 475. Both the power of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. Accordingly, the anvil 10 can rotate about the rotation axis AX with a high torque.

Sealing member and supporting member

The seal member 70 is disposed: the interior of the hammer housing 4. The seal member 70 is disposed: the 3 rd barrel portion 404 of the hammer housing 4 is located radially inward. The seal member 70 is disposed inside the hammer case 4: the boundary between the anvil bearing 46 and the anvil shaft portion 101. At least a portion of the seal member 70 contacts the outer peripheral surface of the anvil shaft portion 101. The seal member 70 is supported by the anvil bearing 46. The seal member 70 is disposed: the radially inner position of the front side lobe 465 of the anvil bearing 46. The seal member 70 of the embodiment is a lip seal.

The sealing member 70 seals the boundary between the anvil bearing 46 and the anvil shaft portion 101. The sealing member 70 can suppress: the lubricant (grease) existing inside the hammer case 4 may leak out of the hammer case 4 through the opening of the front end portion of the hammer case 4. In addition, the sealing member 70 can suppress: a foreign matter outside the hammer case 4 intrudes into the inside of the hammer case 4.

As shown in fig. 5, the seal member 70 has: an outer ring portion 71, a rear lip portion 72, and a front lip portion 73. The outer peripheral surface of the outer ring portion 71 facing radially outward is in contact with the inner peripheral surface 465S of the front side projection 465. The rear surface of the outer ring portion 71 toward the rear side is in contact with the front surface 463F of the front side supporting portion 463. The rear lip 72 and the front lip 73 are respectively disposed at: further radially inward than the outer ring portion 71. The rear lip 72 is configured to: and is positioned further rearward than the front lip 73. The rear lip 72 and the front lip 73 are in contact with the outer peripheral surface of the anvil shaft 101, respectively. The rear lip 72 and the front lip 73 are in contact with the outer peripheral surface of the front cylindrical portion 114, respectively.

The support member 80 is disposed: the interior of the hammer housing 4. The support member 80 is disposed: and is positioned further forward than the sealing member 70. The support member 80 is opposed to the seal member 70. The support member 80 can support the seal member 70 from the front. As described above, the front end portion of the hammer case 4 is provided with: for configuring the opening of the anvil shaft portion 101. The opening of the hammer case 4 is defined by the inner peripheral surface 405S of the 4 th barrel portion 405. The support member 80 is configured to: facing the opening of the hammer housing 4. The support member 80 can suppress: the sealing member 70 is separated from the opening of the hammer case 4 toward the front.

The support member 80 is annular. The support member 80 is: a washer disposed at a position around the anvil shaft 101. The support member 80 is separated from the anvil shaft portion 101.

The support member 80 is fixed to: at least one of the hammer housing 4 and the anvil bearing 46. The support member 80 of the embodiment is sandwiched by the anvil bearing 46 and a part of the hammer case 4 from the front-rear direction. In the embodiment, the outer edge portion on the radially outer side of the support member 80 is sandwiched between the front surface 465F of the front side projection 465 and the rear surface 405R of the 4 th cylinder 405.

The support member 80 is inserted into the interior of the hammer housing 4 from an opening provided at the rear end portion of the hammer housing 4. After the support member 80 is inserted into the interior of the hammer housing 4 in such a manner that the front surface of the support member 80 is brought into contact with the rear surface 405R of the 4 th barrel portion 405, the seal member 70 and the anvil bearing 46 are inserted into the interior of the hammer housing 4 from the openings provided at the rear end portion of the hammer housing 4, respectively. The anvil bearing 46 is fixed to the hammer housing 4by being pressed into the 2 nd barrel portion 402. The hammer housing 4 and the anvil bearing 46 are positioned in the front-rear direction by the front surface 461F of the outer ring portion 461 coming into contact with the rear surface 404R of the 3 rd barrel portion 404.

Further, the supporting member 80 may be configured to: a portion of the circumference of the anvil shaft portion 101. A notch may be provided in a part of the support member 80. The support member 80 may be a circlip. In this case, the support member 80 may be disposed inside the hammer case 4 via an opening provided at the front end portion of the hammer case 4.

< Anvil >, a method of manufacturing the same

Fig. 7 is a perspective view of the anvil 10 of the present embodiment as seen from the front right. Fig. 8 is a side view of the anvil 10. Fig. 9 is a view of the anvil 10 from the front. Fig. 10 is an enlarged view of a portion of the anvil 10.

The anvil 10 has: anvil shaft portion 101 and 2 anvil protrusions 102. The anvil shaft portion 101 extends in the axial direction. Each anvil projection 102 projects radially outward from the anvil shaft portion 101.

The anvil shaft portion 101 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, the transition portion 130, and the tip portion 140. The rear end portion of the 1 st shaft portion 110 is connected to the anvil protrusion 102. The 2 nd shaft portion 120 is arranged to: a position forward of the 1 st shaft 110. The 2 nd shaft portion 120 is arranged to: the position closer to the output side than the 1 st shaft portion 110. The transition portion 130 is disposed in the front-rear direction: a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The front end portion of the 1 st shaft portion 110 is connected to the rear end portion of the transition portion 130. The rear end portion of the 2 nd shaft portion 120 is connected to the front end portion of the transition portion 130. The 1 st shaft portion 110 and the 2 nd shaft portion 120 are connected by a transition portion 130. The tip 140 is disposed: a position forward of the 2 nd shaft portion 120.

The 1 st shaft portion 110 is arranged to: the inside position of the hammer housing 4. At least a portion of the 1 st shaft portion 110 is supported by the anvil bearing 46. The cross section of the 1 st shaft 110 perpendicular to the rotation axis AX is circular. The 1 st shaft portion 110 has: recess 111, rear side cylindrical portion 112, recess 113, and front side cylindrical portion 114. The concave portion 111 is arranged in: and is located further rearward than the rear cylindrical portion 112. The recess 111 is provided in: the boundary between the anvil shaft portion 101 and the anvil protrusion 102. The outer diameter of the concave portion 111 is smaller than the outer diameter of the rear side cylindrical portion 112. As shown in fig. 5, the rear cylindrical portion 112 is supported by: rear support 462 of anvil bearing 46. The outer peripheral surface of the rear cylindrical portion 112 contacts the inner peripheral surface 462S of the rear support portion 462. The recess 113 is arranged in: and is located further forward than the rear cylindrical portion 112. The outer diameter of the recess 113 is smaller than the outer diameter of the rear cylindrical portion 112. The front cylindrical portion 114 is disposed: and is located further forward than the recess 113. The outer diameter of the front cylindrical portion 114 is substantially equal to the outer diameter of the rear cylindrical portion 112. As shown in fig. 5, the front cylindrical portion 114 is supported by: a front side support 463 of the anvil bearing 46. The outer peripheral surface of the front cylindrical portion 114 contacts the inner peripheral surface 463S of the front support portion 463.

The 2 nd shaft portion 120 is arranged to: the outboard position of the hammer housing 4. The 2 nd shaft portion 120 protrudes forward from an opening provided at the front end portion of the hammer case 4. The hub 300 is attached to the 2 nd shaft 120. The cross section of the 2 nd shaft portion 120 orthogonal to the rotation axis AX has a regular polygon shape. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. In the embodiment, the outer shape of the cross section of the 2 nd shaft portion 120 orthogonal to the rotation axis AX is substantially a quadrangular shape. The 2 nd shaft portion 120 has: 4 flat portions 121 and 4 flat portion connecting portions 122. As shown in fig. 9, the planar portion 121 includes: planar portion 121A, planar portion 121B, planar portion 121C, and planar portion 121D. The planar portion 121B is circumferentially adjacent to the planar portion 121A. The planar portion 121C is circumferentially adjacent to the planar portion 121B. The planar portion 121D is circumferentially adjacent to the planar portion 121C. The flat portion connecting portion 122 has: planar portion connecting portion 122A, planar portion connecting portion 122B, planar portion connecting portion 122C, and planar portion connecting portion 122D. The flat portion connecting portion 122A is provided at: a boundary between the planar portion 121A and the planar portion 121B. The flat portion connecting portion 122B is provided at: a boundary between the planar portion 121B and the planar portion 121C. The flat portion connecting portion 122C is provided at: a boundary between the planar portion 121C and the planar portion 121D. The flat portion connecting portion 122D is provided at: the boundary between the planar portion 121D and the planar portion 121A.

As shown in fig. 10, 1 planar portion 121 has: a1 st edge 124 extending in the front-rear direction, and a2 nd edge 125 extending in the front-rear direction. The 1 st edge 124 is configured to: the 1 st circumferential end of the planar portion 121. The 2 nd edge 125 is configured to: the 2 nd circumferential end of the planar portion 121. The 4 planar portions 121 each have: 1 st edge 124 and 2 nd edge 125.

As shown by the arrow in fig. 9, when the counterclockwise direction when the anvil 10 is viewed from the front is set to the normal rotation direction, the 1 st edge 124 is arranged: further toward the front side in the forward direction than the 2 nd edge 125. When the bolt inserted into the socket 300 is tightened, the anvil 10 is rotated toward the 1 st circumferential direction. That is, in the bolt tightening operation, the anvil 10 is rotated in the forward rotation direction.

The transition portion 130 connects the 1 st cylindrical shaft portion 110 and the 2 nd shaft portion 120 having a regular polygonal shape (regular quadrangular prism shape). At least a portion of the transition portion 130 smoothly connects the outer peripheral surface of the front cylindrical portion 114 of the 1 st shaft portion 110 with the outer surface of the 2 nd shaft portion 120. The transition portion 130 has: the support portion 131 and the connection portion 135. The support portion 131 is coupled to the 1 st edge 124 of the 2 nd shaft portion 120. The connecting portion 135 is coupled to the 2 nd edge 125 of the 2 nd shaft portion 120. In the circumferential direction, the position of the support portion 131 is substantially the same as the position of the 1 st edge 124. In the circumferential direction, the position of the connecting portion 135 is substantially the same as the position of the 2 nd edge 125. Support 131 is disposed immediately after 1 st edge 124. That is, the support portion 131 is arranged: an extension extending axially rearward from the 1 st edge 124. The connection 135 is disposed immediately after the 2 nd edge 125. That is, the connection portion 135 is arranged: an extension extending axially rearward from the 2 nd edge 125. The connection portion 135 is disposed in the front-rear direction: and further rearward than the support portion 131. The transition portion 130 is connected to the 2 nd edge 125 at a position further rearward than the support portion 131.

The transition portions 130 are respectively connected to the 41 st edges 124. The transition portions 130 are respectively connected to the 42 nd edges 125. The 4 support portions 131 are provided at intervals in the circumferential direction. The 4 connection portions 135 are disposed at intervals in the circumferential direction. As shown in fig. 9, the support portion 131 includes: support 131A, support 131B, support 131C, and support 131D. The support portion 131A is coupled to: the 1 st edge 124 of the planar portion 121A. The support portion 131B is coupled to: the 1 st edge 124 of the planar portion 121B. The support portion 131C is coupled to: the 1 st edge 124 of the planar portion 121C. The support portion 131D is coupled to: the 1 st edge 124 of the planar portion 121D.

The rear end portions of the socket 300 fitted to the 2 nd shaft portion 120 are in contact with the 4 support portions 131, respectively. The rear end portions of the socket 300 fitted to the 2 nd shaft portion 120 are not in contact with the 4 connection portions 135, respectively.

The socket 300 attached to the 2 nd shaft 120 can contact the transition portion 130 at the rear side of the 1 st edge 124 side, and cannot contact the transition portion 130 at the rear side of the 2 nd edge 125 side. When the striking mechanism 9 strikes the anvil 10, the stress on the 1 st edge 124 side is high and the stress on the 2 nd edge 125 side is low.

The socket 300 attached to the 2 nd shaft 120 may be configured to: can contact the transition 130 at the rear side of the 2 nd edge 125 side, and cannot contact the transition 130 at the rear side of the 1 st edge 124 side. When the striking mechanism portion 9 strikes the anvil 10, the stress on the 2 nd edge 125 side may be high and the stress on the 1 st edge 124 side may be low.

The transition portion 130 has: a tapered portion 134 connected to the front cylindrical portion 114. The rear end portion of the tapered portion 134 is connected to: a front end portion of the front cylindrical portion 114. The outer diameter of the tapered portion 134 gradually decreases toward the front. The tip end of the tapered portion 134 is connected to: planar portion 121 and planar portion connecting portion 122. The supporting portion 131 and the connecting portion 135 are formed by cutting out a part of the tapered portion 134. The surface of the portion from which the tapered portion 134 is cut off is curved. The transition portion 130 has: curved surface portion 132 connected to planar portion 121. The curved surface portion 132 is provided in the circumferential direction: a position between the connection portion 135 and the supporting portion 131. A curved portion 133 is formed at a boundary between the outer surface of the tapered portion 134 and the surface of the curved portion 132. The curved portion 133 connects the connecting portion 135 and the supporting portion 131. The curved portion 133 is inclined forward in the 1 st circumferential direction (forward rotation direction).

In the embodiment, a recess 123 is provided in a part of the planar portion 121. The recess 123 is recessed from the planar portion 121 toward the radially inner side. The concave portion 123 is provided in a belt shape so as to be inclined forward toward the 1 st circumferential direction (forward rotation direction). Further, the concave portion 123 may not be provided.

The impact tool 1 of the embodiment includes: a motor 6 having a rotor 27; a striking mechanism 9 that rotates by the rotational force of the rotor 27; and an anvil 10 that is struck in the rotational direction by the striking mechanism portion 9. The anvil 10 includes: anvil shaft portion 101 having a rotation axis AX. The anvil shaft portion 101 has: a1 st shaft portion 110 having a circular cross-section orthogonal to the rotation axis AX; a2 nd shaft portion 120 which is disposed on the output side of the 1 st shaft portion 110, and has a cross-sectional shape of a regular polygon; and a transition portion 130 disposed at a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: a1 st edge 124 disposed at the 1 st circumferential end of the rotation axis AX; and a2 nd edge 125 disposed at the 2 nd circumferential end. The socket 300 attached to the 2 nd shaft 120 can contact the transition portion at the rear side of the 1 st or 2 nd edge 124, 125 side, and cannot contact the transition portion at the rear side of the 2 nd or 1 st edge 125, 124 side. When the anvil 10 is hit, the stress on the 1 st or 2 nd edge 124, 125 side is higher and the stress on the 2 nd or 1 st edge 125, 124 side is lower.

Accordingly, the durability of the anvil 10 is improved.

< Action of impact tool >

Next, the operation of the impact tool 1 will be described. For example, when performing a bolt tightening operation on an object, an operator holds the grip 22 with a right hand, for example, and pulls the trigger bar 14 with an index finger of the right hand. When the trigger lever 14 is pulled, power is supplied from the battery pack 25 to the motor 6, so that the motor 6 is started and the lamp 17 is lighted. The rotor shaft 33 is rotated by the activation of the motor 6. Then, the rotational force of the rotor shaft 33 is transmitted to the planetary gear 42 via the pinion gear 41. The planetary gear 42 revolves around the pinion gear 41 while rotating while meshing with the internal teeth of the internal gear 43. The planetary gear 42 is rotatably supported by the main shaft 8 via a pin 42P. The main shaft 8 is rotated at a rotation speed lower than that of the rotor shaft 33 by the revolution of the planetary gear 42.

When the spindle 8 rotates in a state where the hammer projection 475 is in contact with the anvil projection 102, the anvil 10 rotates together with the hammer 47 and the spindle 8. Accordingly, the bolt tightening operation is performed.

When a load of a predetermined value or more is applied to the anvil 10 by the progress of the bolt tightening operation, the rotation of the anvil 10 and the hammer 47 is stopped. When the spindle 8 rotates in this state, the hammer 47 moves rearward. Accordingly, the contact between the hammer projection 475 and the anvil projection 102 is released.

The hammer 47 moved rearward is moved forward while rotating by the elastic forces of the 1 st coil spring 51 and the 2 nd coil spring 52. Accordingly, the anvil protrusion 102 is struck in the rotational direction by the hammer protrusion 475. Accordingly, the anvil 10 rotates about the rotation axis AX with a high torque. Thus, the screw is fastened to the work object with a high torque.

As described above, the impact tool 1 according to the embodiment includes: a motor 6 having a rotor 27 that rotates around a rotation axis AX extending in the front-rear direction; a main shaft 8 that rotates by the rotational force of the rotor 27; an anvil 10 disposed at a position forward of at least a part of the spindle 8, the anvil having an anvil shaft portion 101 extending in an axial direction parallel to the rotation axis AX, and an anvil protrusion 102 protruding from the anvil shaft portion 101 toward a radial outside of the rotation axis AX; and a hammer 47 supported by the main shaft 8 and having a hammer projection 475 that strikes the anvil projection 102 in the rotational direction. The anvil shaft portion 101 has: a 1 st shaft portion 110 having a circular cross-section orthogonal to the rotation axis AX; a 2 nd shaft portion 120 which is disposed further forward than the 1 st shaft portion 110 and has a square cross-sectional shape; and a transition portion 130 disposed at a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: 4 flat portions 121 and 4 flat portion connecting portions 122. The 4 planar portions 121 each have: a 1 st edge 124 disposed at the 1 st circumferential end of the rotation axis AX; and a 2 nd edge 125 disposed at the 2 nd circumferential end. The transition portion 130 has a support portion 131 connected to the 1 st edge 124, and the transition portion 130 is connected to the 2 nd edge 125 at a position rearward of the support portion 131.

According to the above configuration, it is possible to suppress: in the case where a large force is locally applied to the transition 130, the durability of the anvil 10 is improved. In the case where the hub 300 is assembled to the 2 nd shaft portion 120, the rear end portion of the hub 300 may contact at least a portion of the transition portion 130. When the anvil 10 strikes the hammer 47, the nipple 300 vibrates. Vibration of the socket 300 and a force in a rotational direction due to a bolt fastening operation may be applied to the transition portion 130. According to the above configuration, the socket 300 is in contact with the support portion 131 coupled to the 1 st edge 124 with the 1 st contact force, and the socket 300 is in contact with or out of contact with the vicinity of the 2 nd edge 125 with the 2 nd contact force smaller than the 1 st contact force. Accordingly, for example, even if tensile stress in the rotational direction acts in the vicinity of the 2 nd edge 125 due to the bolt tightening operation, it is possible to suppress: the vibration of the nipple 300 is applied to the vicinity of the 2 nd edge 125. That is, it is possible to suppress: in the case where both the vibration of the nipple 300 and the tensile stress in the rotation direction are applied to the vicinity of the 2 nd edge 125. Vibration of the nipple 300 is exclusively applied near the 1 st edge 124 and tensile stress in the rotational direction is exclusively applied near the 2 nd edge 125. Since the force applied to the transition 130 is dispersed to the vicinity of the 1 st edge 124 and the vicinity of the supporting portion 131, the durability of the anvil 10 is improved.

In the embodiment, the socket 300 can be attached to the 2 nd shaft portion 120. The socket 300 is in contact with the 4 support parts 131, respectively.

Accordingly, the anvil 10 can stably support the socket 300.

In the embodiment, when the bolt inserted into the nipple 300 is tightened, the anvil 10 is rotated toward the 1 st circumferential direction (forward rotation direction).

Thus, in the bolt tightening work, tensile stress is concentrated on: and a2 nd edge 125 disposed further toward the front side in the reverse direction than the 1 st edge 124. Even if tensile stress in the rotational direction acts in the vicinity of the 2 nd edge 125 due to the bolt tightening operation, it is possible to suppress: the vibration of the nipple 300 is applied to the vicinity of the 2 nd edge 125. That is, it is possible to suppress: in the case where both the vibration of the nipple 300 and the tensile stress in the rotation direction are applied to the vicinity of the 2 nd edge 125. Vibration of the nipple 300 may be exclusively applied to the vicinity of the supporting portion 131, and tensile stress in the rotation direction may be exclusively applied to the vicinity of the 2 nd edge 125. In the bolt tightening operation, since the force applied to the transition portion 130 is dispersed to the vicinity of the support portion 131 and the vicinity of the 2 nd edge 125, the durability of the anvil 10 is improved.

The transition portion 130 of the embodiment has: a connection 135 connected to the 2 nd edge 125. The connection portion 135 is disposed: and further rearward than the support portion 131. The socket 300 is in contact with the 4 supporting parts 131, respectively, and is not in contact with the 4 connecting parts 135, respectively.

Accordingly, in the bolt tightening operation, tensile stress in the rotational direction tends to concentrate on the connecting portion 135. Since the nipple 300 is in contact with the supporting portion 131 and the nipple 300 is separated from the connecting portion 135, it is possible to suppress: in the case where both the vibration of the socket 300 and the tensile stress in the rotation direction are applied to the connection portion 135. Vibration of the socket 300 may be exclusively applied to the supporting portion 131 and tensile stress in a rotation direction may be exclusively applied to the connection portion 135. Since the force applied to the transition portion 130 is dispersed to the supporting portion 131 and the connecting portion 135, the durability of the anvil 10 is improved.

The transition portion 130 of the embodiment has: a curved surface portion 132 provided at a position between the connecting portion 135 and the supporting portion 131 and connected to the planar portion 121. The nipple 300 does not contact the curved surface portion 132.

Accordingly, suppression of: a situation where a large force is locally applied to the transition 130.

The impact tool 1 of the embodiment includes: anvil bearing 46 for supporting at least a portion of 1 st shaft portion 110.

Accordingly, the anvil bearing 46 can support the 1 st cylindrical shaft portion 110.

The impact tool 1 of the embodiment includes: a motor 6 having a rotor 27; a striking mechanism 9 that rotates by the rotational force of the rotor 27; and an anvil 10 that is struck in the rotational direction by the striking mechanism portion 9. The anvil 10 includes: anvil shaft portion 101 having a rotation axis AX. The anvil shaft portion 101 has: a1 st shaft portion 110 having a circular cross-section orthogonal to the rotation axis AX; a2 nd shaft portion 120 which is disposed on the output side of the 1 st shaft portion 110, and has a cross-sectional shape of a regular polygon; and a transition portion 130 disposed at a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: a1 st edge 124 disposed at the 1 st circumferential end of the rotation axis AX; and a2 nd edge 125 disposed at the 2 nd circumferential end. The socket 300 attached to the 2 nd shaft 120 can contact the transition portion 130 on the 1 st edge 124 side or the 2 nd edge 125 side, and cannot contact the transition portion 130 on the 2 nd edge 125 side or the 1 st edge 124 side. When the anvil 10 is hit, the stress on the 1 st edge 124 side or the 2 nd edge 125 side is high, and the stress on the 2 nd edge 125 side or the 1 st edge 124 side is low.

Accordingly, the durability of the anvil 10 is improved.

[ Embodiment 2]

Embodiment 2 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 11 is a side view of the anvil 1010 of the present embodiment. Fig. 12 is an enlarged view of a portion of the anvil 1010. As in the above embodiment, the anvil shaft portion 1101 of the anvil 1010 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, and the transition portion 130. The 1 st shaft 110 has a circular cross-section perpendicular to the rotation axis AX. The 2 nd shaft portion 120 is disposed on the output side of the 1 st shaft portion 110, and the cross-sectional shape is a regular polygon. The transition portion 130 is configured to: a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: edge 1 124 and edge 2 125. The 1 st edge 124 is configured to: the 1 st circumferential end of the rotation shaft AX. The 2 nd edge 125 is configured to: the end in the 2 nd circumferential direction.

In fig. 11 and 12, the transition portion on the rear side of the 1 st edge 124 side or the rear side of the planar portion 121 on the 1 st edge 124 side, which is hatched, is: hardness 1. The transition portion of the rear side of the 2 nd edge 125 side, or the rear side of the planar portion 121 of the 2 nd edge 125 side, which is not hatched, is: hardness 2, which is lower than hardness 1.

As described above, the hardness difference is applied to the 2 nd shaft portion 120 of the anvil 10, which is the fitting portion of the socket 300, by the heat treatment or the combination of materials. Examples of the method of the heat treatment include: the high hardness portion is laser quenched. The combinations of materials can be exemplified by: a superhard chip is mounted on the high-hardness portion. Axial vibration and load are received by the high-hardness portion, and torsional load in the rotational direction is received by the low-hardness portion (high-toughness portion). Accordingly, the strength or durability of the anvil 1010 when rotated in the forward rotation direction is improved in a state where the bolt is inserted into the socket 300.

The impact tool 1 of the embodiment includes: a motor 6 having a rotor 27; a striking mechanism 9 that rotates by the rotational force of the rotor 27; and an anvil 10 that is struck in the rotational direction by the striking mechanism portion 9. The anvil 10 includes: anvil shaft portion 101 having a rotation axis AX. The anvil shaft portion 101 has: a1 st shaft portion 110 having a circular cross-section orthogonal to the rotation axis AX; a 2 nd shaft portion 120 which is disposed on the output side of the 1 st shaft portion 110, and has a cross-sectional shape of a regular polygon; and a transition portion 130 disposed at a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: a1 st edge 124 disposed at the 1 st circumferential end of the rotation axis AX; and a 2 nd edge 125 disposed at the 2 nd circumferential end. The transition portion on the rear side of the 1 st edge 124 side or the rear side of the planar portion 121 on the 1 st edge 124 side is: hardness 1. The transition portion of the rear side of the 2 nd edge 125 side, or the rear side of the planar portion 121 of the 2 nd edge 125 side may be: hardness 2, which is lower than hardness 1.

Accordingly, the durability of the anvil 10 is improved.

[ Embodiment 3]

Embodiment 3 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 13 is a side view of the anvil 2010 of the present embodiment. The anvil shaft portion 2101 of the anvil 2010 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, and the transition portion 130. The 2 nd shaft portion 120 is arranged to: the position closer to the output side than the 1 st shaft portion 110. The 2 nd shaft portion 120 has a cross-sectional shape orthogonal to the rotation axis AX. The transition portion 130 is configured to: a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: edge 1 124 and edge 2 125. The 1 st edge 124 is configured to: the 1 st circumferential end of the rotation shaft AX. The 2 nd edge 125 is configured to: the end in the 2 nd circumferential direction.

The hub 300 is attached to the 2 nd shaft 120. When the bolt inserted into the socket 300 is fastened, the anvil 2010 is rotated in the forward rotation direction. At this time, the surface of the 1 st shaft portion 110 is in a spiral shape so that the anvil shaft portion 2101 receives a compressive load in the axial direction.

As described above, since the surface of the 1 st shaft portion 110 has a spiral shape, the stress applied to the anvil 2010 varies depending on the rotation direction. At least a part of the anvil shaft portion 2101 is twisted in a spiral shape, so that a part of the load in the rotation direction is decomposed in the axial direction. In the case where the anvil 2010 is rotated in the forward rotation direction, a compressive load is applied to the anvil 2010. In the case where the anvil 2010 is rotated in the reverse direction, a tensile load is applied to the anvil 2010. The material comprising anvil 2010 is generally strong in the compressive direction. Thus, according to the present embodiment, the strength or durability when the anvil 2010 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300 is improved.

The impact tool 1 of the embodiment includes: a motor 6 having a rotor 27; a striking mechanism 9 that rotates by the rotational force of the rotor 27; and an anvil 10 that is struck in the rotational direction by the striking mechanism portion 9. The anvil 10 includes: anvil shaft portion 101 having a rotation axis AX. The anvil shaft portion 101 has: a1 st shaft portion 110; a 2 nd shaft portion 120 which is disposed on the output side of the 1 st shaft portion 110, and has a regular polygon shape in cross section orthogonal to the rotation axis AX; and a transition portion 130 disposed at a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: a1 st edge 124 disposed at the 1 st circumferential end of the rotation axis AX; and a 2 nd edge 125 disposed at the 2 nd circumferential end. The hub 300 is attached to the 2 nd shaft 120. When the bolt inserted into the socket 300 is fastened, the anvil 10 is rotated in the forward rotation direction. The surface of the 1 st shaft portion 110 may be spirally shaped so that the anvil shaft portion 101 receives a compressive load in the axial direction AX when the anvil 10 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300.

Accordingly, the durability of the anvil 10 is improved.

[ Embodiment 4]

Embodiment 4 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 14 is a side view of the anvil 3010 of the present embodiment. Fig. 15 is an enlarged view of a portion of the anvil 3010. The anvil shaft portion 3101 of the anvil 3010 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, and the transition portion 130. The 1 st shaft 110 has a circular cross-section perpendicular to the rotation axis AX. The 2 nd shaft portion 120 is arranged to: the position closer to the output side than the 1 st shaft portion 110. The cross-section of the 2 nd shaft portion 120 has a regular polygonal shape. The transition portion 130 is configured to: a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: edge 1 124 and edge 2 125. The 1 st edge 124 is configured to: the 1 st circumferential end of the rotation shaft AX. The 2 nd edge 125 is configured to: the end in the 2 nd circumferential direction.

The planar portion 121 has a protrusion 126 on the rear side in the 1 st circumferential direction. The rear end portion of the socket 300 fitted to the 2 nd shaft portion 120 contacts the protrusion 126.

The protrusion 126 improves strength and durability when the anvil 3010 rotates in the forward rotation direction in a state where the bolt is inserted into the socket 300.

The impact tool 1 of the embodiment includes: a motor 6 having a rotor 27; a striking mechanism 9 that rotates by the rotational force of the rotor 27; and an anvil 10 that is struck in the rotational direction by the striking mechanism portion 9. The anvil 10 includes: anvil shaft portion 101 having a rotation axis AX. The anvil shaft portion 101 has: a1 st shaft portion 110 having a circular cross-section orthogonal to the rotation axis AX; a 2 nd shaft portion 120 which is disposed on the output side of the 1 st shaft portion 110, and has a cross-sectional shape of a regular polygon; and a transition portion 130 disposed at a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The 2 nd shaft portion 120 has: at least 3 planar portions 121 and at least 3 planar portion connecting portions 122. The at least 3 planar portions 121 each have: a1 st edge 124 disposed at the 1 st circumferential end of the rotation axis AX; and a 2 nd edge 125 disposed at the 2 nd circumferential end. The planar portion 121 has a protrusion 126 on the rear side in the 1 st circumferential direction. The rear end portion of the socket 300 fitted to the 2 nd shaft portion 120 contacts the protrusion 126.

Accordingly, the durability of the anvil 10 is improved.

[ Embodiment 5]

Embodiment 5 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 16 is a side view of the anvil 10 of the present embodiment. The anvil 10 of the present embodiment is the same as the anvil 10 described in embodiment 1.

The anvil shaft portion 101 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, and the transition portion 130. The 1 st shaft 110 has a circular cross-section perpendicular to the rotation axis AX. The 2 nd shaft portion 120 is arranged to: a position forward of the 1 st shaft 110. The 2 nd shaft portion 120 has a square cross-sectional shape perpendicular to the rotation axis AX. The transition portion 130 is arranged in the axial direction: a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120.

The 2 nd shaft portion 120 has: 4 flat portions 121 and 4 flat portion connecting portions 122. The 4 planar portions 121 each have: edge 1 124 and edge 2 125. The 1 st edge 124 is configured to: an end portion of the rotation shaft AX in the 1 st circumferential direction (forward rotation direction). The 2 nd edge 125 is configured to: end in the 2 nd circumferential direction (reverse direction).

The forward rotation direction side is: the side of the anvil 10 that is in contact with the nipple 300.

In the plane parallel to the planar portion 121, the 1 st portion 1301 of the transition portion 130 that is on the 1 st circumferential direction (forward rotation direction) side from the center line CX of the planar portion 121 in the circumferential direction and that is linked to the 1 st edge 124 has a shape different from: the shape of the 2 nd portion 1302 of the transition 130 on the 2 nd circumferential side from the centerline CX and joined to the 2 nd edge 125. The centerline CX is: a line passing through the center line CX of the planar portion 121 in the circumferential direction and extending in the axial direction.

Similarly to embodiment 1, the transition portion 130 includes: the support portion 131 and the connection portion 135. The support 131 is connected to the 1 st edge 124. The connecting portion 135 is connected to the 2 nd edge 125. The connection portion 135 is disposed: and further rearward than the support portion 131. The hub 300 is attached to the 2 nd shaft 120. The nipple 300 is in contact with the supporting portion 131 and is not in contact with the connecting portion 135.

As shown in fig. 5 and 16, a concave portion 140A is provided at the distal end portion 140. The recess 140A surrounds the rotation axis AX. The annular spring 85 is disposed in the recess 140A. The socket 300 fitted to the 2 nd shaft 120 is fixed to the 2 nd shaft 120 by the elastic force of the ring spring 85. In the following description, the manner in which the socket 300 is fixed by the elastic force of the ring spring 85 will be appropriately referred to as: a ring spring mode.

The transition portion 130 has a curved portion 132. The curved surface portion 132 is provided at a position between the connecting portion 135 and the supporting portion 131, and is connected to the planar portion 121. In the axial direction, a recess 123 is provided between the transition portion 130 and the planar portion 121. Recess 123 connects 1 st edge 124 with 2 nd edge 125. The front side edge 123A for defining the front end of the recess 123 and the rear side edge 123B for defining the rear end of the recess 123 are parallel to each other.

The position of the 1 st end of the front side edge 123A connected to the 1 st edge 124 is different from the position of the 2 nd end of the front side edge 123A connected to the 2 nd edge 125 in the axial direction. That is, the concave portions 123 (the front side edge 123A and the rear side edge 123B) are inclined with respect to the center line CX. In the example shown in fig. 16, the 1 st end portion of the front side edge 123A connected to the 1 st edge 124 is arranged in the axial direction: forward of the 2 nd end of the front edge 123A connected to the 2 nd edge 125.

The distance La between the support portion 131 and the 1 st end of the leading edge 123A in the axial direction is 4.3mm.

In addition, in the axial direction, a distance La between the support portion 131 and the 1 st end portion of the leading edge 123A is: the distance Lb between the front end portion of the anvil 10 (anvil shaft portion 101) and the rear end portion of the transition portion 130 is 1/6 or more and 1/5 or less.

In a plane parallel to the planar portion 121, an angle θ formed by a reference line perpendicular to the center line CX and the front edge 123A is 15 ° or more and 25 ° or less. The angle θ may be 8 °, for example.

When the bolt inserted into the socket 300 is tightened, the anvil 10 is rotated toward the forward rotation direction side. As in embodiment 1 described above, the anvil 10 has a1 st portion 1301 on the forward rotation direction side. Thus, the strength or durability when the anvil 10 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300 is improved.

In addition, since the distance La is 4.3mm, the strength or durability of the anvil 10 is improved. If the distance La is too long, the area of the planar portion 121 may become small so that stress is easily concentrated, or the entire length of the anvil 10 may become long. If the distance La is too short, the strength or durability of the anvil 10 may be insufficient.

Further, since the angle θ is 15 ° or more and 25 ° or less, the strength or durability of the anvil 10 is improved. As described above, the vibration of the nipple 300 may be exclusively applied near the 1 st edge 124, and the tensile stress in the rotational direction may be exclusively applied near the 2 nd edge 125. Since the recess 123 is inclined, the distance between the portion to which vibration is applied and the portion to which tensile stress is applied becomes longer. Thus, the strength or durability of the anvil 10 is improved. If the angle θ is higher than 25 °, and is close to 45 °, the crack propagation angle is close. If the angle θ is less than 15 °, the effect of improving strength and durability becomes smaller.

[ Embodiment 6]

Embodiment 6 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 17 is a perspective view of the anvil 10N1 of the present embodiment as seen from the front right. Fig. 18 is a perspective view of the anvil 10N1 from the rear left. Fig. 19 is a side view of the anvil 10N 1. Fig. 20 is a cross-sectional view of the anvil 10N 1. Fig. 21 is an enlarged view of a part of the anvil 10N 1.

The anvil 10N1 has: anvil shaft portion 101N1, 2 anvil protrusions 102, and recess 103. The anvil shaft portion 101N1 extends in the axial direction. Each anvil projection 102 projects radially outward from the rear end portion of the anvil shaft portion 101N 1. The recess 103 is recessed toward the front from the center of the rear surface of the anvil 10N 1. The tip of the spindle 8 is disposed in the recess 103.

The anvil shaft portion 101N1 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, the transition portion 130N, and the tip portion 140. The rear end portion of the 1 st shaft portion 110 is connected to the anvil protrusion 102. The 2 nd shaft portion 120 is arranged to: a position forward of the 1 st shaft 110. The transition portion 130N is disposed in the front-rear direction: a position between the 1 st shaft portion 110 and the 2 nd shaft portion 120. The front end portion of the 1 st shaft portion 110 is connected to the rear end portion of the transition portion 130N. The rear end portion of the 2 nd shaft portion 120 is connected to the front end portion of the transition portion 130N. The 1 st shaft portion 110 and the 2 nd shaft portion 120 are connected by a transition portion 130N. The tip 140 is disposed: a position forward of the 2 nd shaft portion 120.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The cross section of the 1 st shaft 110 perpendicular to the rotation axis AX is circular. The 1 st shaft portion 110 has: recess 111, rear side cylindrical portion 112, recess 113, and front side cylindrical portion 114. The concave portion 111 is arranged in: and is located further rearward than the rear cylindrical portion 112. The recess 111 is provided in: the boundary between the anvil shaft portion 101 and the anvil protrusion 102. The outer diameter of the concave portion 111 is smaller than the outer diameter of the rear side cylindrical portion 112.

The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10N1 is a portion common to the anvil 10 and the like described in the above embodiments.

The hub 300 is attached to the 2 nd shaft 120. The tip 140 is provided with a recess 140A. The anvil 10N1 is fixed to the socket 300 by means of an annular spring. The cross section of the 2 nd shaft 120 perpendicular to the rotation axis AX has a substantially quadrangular shape. The 2 nd shaft portion 120 has: 4 flat portions 121 and 4 flat portion connecting portions 122.

The 1 planar portion 121 has: a1 st edge 124 extending in the front-rear direction, and a2 nd edge 125 extending in the front-rear direction. The 1 st edge 124 is configured to: the 1 st circumferential (forward rotation direction) end of the planar portion 121. The 2 nd edge 125 is configured to: the end portion of the planar portion 121 in the 2 nd circumferential direction (reverse direction). The 4 planar portions 121 each have: 1 st edge 124 and 2 nd edge 125.

When the bolt inserted into the socket 300 is tightened, the anvil 10N1 is rotated in the forward rotation direction.

The transition portion 130N connects the 1 st cylindrical shaft portion 110 and the 2 nd polygonal (regular quadrangular) shaft portion 120. At least a portion of the transition portion 130N smoothly connects the outer peripheral surface of the front cylindrical portion 114 of the 1 st shaft portion 110 with the outer surface of the 2 nd shaft portion 120. The transition portion 130N has: the support portion 131 and the connection portion 135. The support portion 131 is coupled to the 1 st edge 124 of the 2 nd shaft portion 120. The connecting portion 135 is coupled to the 2 nd edge 125 of the 2 nd shaft portion 120. In the circumferential direction, the position of the support portion 131 is substantially the same as the position of the 1 st edge 124. In the circumferential direction, the position of the connecting portion 135 is substantially the same as the position of the 2 nd edge 125. Support 131 is disposed immediately after 1 st edge 124. That is, the support portion 131 is arranged: an extension extending axially rearward from the 1 st edge 124. The connection 135 is disposed immediately after the 2 nd edge 125. That is, the connection portion 135 is arranged: an extension extending axially rearward from the 2 nd edge 125. The connection portion 135 is disposed in the front-rear direction: and further rearward than the support portion 131. The transition portion 130N is connected to the 2 nd edge 125 at a position rearward of the support portion 131.

The transition portions 130N are respectively connected to the 41 st edges 124. The transition portions 130N are respectively connected to the 42 nd edges 125. The 4 support portions 131 are provided at intervals in the circumferential direction. The 4 connection portions 135 are disposed at intervals in the circumferential direction.

The socket 300 attached to the 2 nd shaft 120 can contact the transition portion 130N at the rear side of the 1 st edge 124 side, and cannot contact the transition portion 130N at the rear side of the 2 nd edge 125 side. When the striking mechanism 9 strikes the anvil 10, the stress on the 1 st edge 124 side is high and the stress on the 2 nd edge 125 side is low.

The transition portion 130N has: a tapered portion 134 connected to the front cylindrical portion 114. The rear end portion of the tapered portion 134 is connected to: a front end portion of the front cylindrical portion 114. The outer diameter of the tapered portion 134 gradually decreases toward the front. The tip end of the tapered portion 134 is connected to: planar portion 121 and planar portion connecting portion 122. The supporting portion 131 and the connecting portion 135 are formed by cutting out a part of the tapered portion 134. The surface of the portion from which the tapered portion 134 is cut off is curved. The transition portion 130N has: curved surface portion 132 connected to planar portion 121. The curved surface portion 132 is provided in the circumferential direction: a position between the connection portion 135 and the supporting portion 131. A curved portion 133 is formed at a boundary between the outer surface of the tapered portion 134 and the surface of the curved portion 132. The curved portion 133 connects the connecting portion 135 and the supporting portion 131. The curved portion 133 is inclined forward in the 1 st circumferential direction (forward rotation direction).

As shown in fig. 21, in a plane parallel to the planar portion 121, a1 st portion 1301 of the transition portion 130N which is on the 1 st circumferential direction (forward rotation direction) side with respect to the center line CX of the planar portion 121 in the circumferential direction and which is connected to the 1 st edge 124 has a shape different from: the shape of the 2 nd portion 1302 of the transition portion 130N on the 2 nd circumferential direction (reverse direction) side with respect to the center line CX and connected to the 2 nd edge 125. The centerline CX is: a line passing through the center line CX of the planar portion 121 in the circumferential direction and extending in the axial direction.

When the bolt inserted into the socket 300 is tightened, the anvil 10N1 is rotated in the forward rotation direction. The anvil 10N1 has a 1 st portion 1301 on the forward rotation direction side. Thus, the strength or durability when the anvil 10N1 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300 is improved.

That is, the strength or durability of the anvil 10N1 when rotated in the forward rotation direction is improved by the shape of the transition portion 130N. In the following description, the transition 130N is appropriately referred to as: a forward transition portion 130N.

[ Embodiment 7]

Embodiment 7 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 22 is a perspective view of the anvil 10R1 of the present embodiment as seen from the front right. Fig. 23 is a perspective view of the anvil 10R1 viewed from the rear left. Fig. 24 is a side view of the anvil 10R 1. Fig. 25 is a cross-sectional view of the anvil 10R 1. Fig. 26 is an enlarged view of a part of the anvil 10R 1.

The anvil 10R1 has: anvil shaft portion 101R1, 2 anvil protrusions 102, and recess 103. The anvil shaft portion 101R1 extends in the axial direction. Each anvil projection 102 projects radially outward from the rear end portion of the anvil shaft portion 101R 1. The recess 103 is recessed toward the front from the center of the rear surface of the anvil 10R 1. The tip of the spindle 8 is disposed in the recess 103.

The anvil shaft portion 101R1 has: the 1 st shaft portion 110, the 2 nd shaft portion 120, the transition portion 130R, and the tip portion 140.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10R1, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10R1 is shared with the anvil 10N1 and the like described in the above embodiments.

The hub 300 is attached to the 2 nd shaft 120. The tip 140 is provided with a recess 140A. The anvil 10N1 is fixed to the socket 300 by means of an annular spring.

The 1 planar portion 121 has: a1 st edge 124 extending in the front-rear direction, and a2 nd edge 125 extending in the front-rear direction. The 1 st edge 124 is configured to: the end portion of the planar portion 121 in the 2 nd circumferential direction (reverse direction). The 2 nd edge 125 is configured to: the 1 st circumferential (forward rotation direction) end of the planar portion 121. The 4 planar portions 121 each have: 1 st edge 124 and 2 nd edge 125.

When the bolt inserted into the socket 300 is loosened, the anvil 10 is rotated in the reverse direction.

The transition portion 130R connects the 1 st cylindrical shaft portion 110 and the 2 nd polygonal (regular quadrangular) shaft portion 120. At least a portion of the transition portion 130R smoothly connects the outer peripheral surface of the front cylindrical portion 114 of the 1 st shaft portion 110 with the outer surface of the 2 nd shaft portion 120. The transition portion 130R has: the support portion 131 and the connection portion 135. The support portion 131 is coupled to the 1 st edge 124 of the 2 nd shaft portion 120. The connecting portion 135 is coupled to the 2 nd edge 125 of the 2 nd shaft portion 120. In the circumferential direction, the position of the support portion 131 is substantially the same as the position of the 1 st edge 124. In the circumferential direction, the position of the connecting portion 135 is substantially the same as the position of the 2 nd edge 125. Support 131 is disposed immediately after 1 st edge 124. That is, the support portion 131 is arranged: an extension extending axially rearward from the 1 st edge 124. The connection 135 is disposed immediately after the 2 nd edge 125. That is, the connection portion 135 is arranged: an extension extending axially rearward from the 2 nd edge 125. The connection portion 135 is disposed in the front-rear direction: and further rearward than the support portion 131. The transition portion 130R is connected to the 2 nd edge 125 at a position further rearward than the support portion 131.

The transition portions 130R are respectively connected to the 41 st edges 124. The transition portions 130R are respectively connected to the 42 nd edges 125. The 4 support portions 131 are provided at intervals in the circumferential direction. The 4 connection portions 135 are disposed at intervals in the circumferential direction.

The socket 300 attached to the 2 nd shaft 120 can contact the transition portion 130R at the rear side of the 1 st edge 124 side, and cannot contact the transition portion 130R at the rear side of the 2 nd edge 125 side. When the striking mechanism 9 strikes the anvil 10, the stress on the 1 st edge 124 side is high and the stress on the 2 nd edge 125 side is low.

The transition portion 130R has: a tapered portion 134 connected to the front cylindrical portion 114. The rear end portion of the tapered portion 134 is connected to: a front end portion of the front cylindrical portion 114. The outer diameter of the tapered portion 134 gradually decreases toward the front. The tip end of the tapered portion 134 is connected to: planar portion 121 and planar portion connecting portion 122. The supporting portion 131 and the connecting portion 135 are formed by cutting out a part of the tapered portion 134. The surface of the portion from which the tapered portion 134 is cut off is curved. The transition portion 130N has: curved surface portion 132 connected to planar portion 121. The curved surface portion 132 is provided in the circumferential direction: a position between the connection portion 135 and the supporting portion 131. A curved portion 133 is formed at a boundary between the outer surface of the tapered portion 134 and the surface of the curved portion 132. The curved portion 133 connects the connecting portion 135 and the supporting portion 131. The curved portion 133 is inclined forward in the 2 nd circumferential direction (reverse direction).

As shown in fig. 26, in the plane parallel to the planar portion 121, the 1 st portion 1301 of the transition portion 130R which is on the 2 nd circumferential direction (reverse direction) side with respect to the center line CX of the planar portion 121 in the circumferential direction and which is connected to the 1 st edge 124 has a shape different from that of: the shape of the 2 nd portion 1302 of the transition portion 130R that is located on the 1 st circumferential direction (forward rotation direction) side from the center line CX and is connected to the 2 nd edge 125. The centerline CX is: a line passing through the center line CX of the planar portion 121 in the circumferential direction and extending in the axial direction.

When the bolt inserted into the socket 300 is loosened, the anvil 10R1 is rotated toward the reverse direction side. The anvil 10R1 has a1 st portion 1301 on the reverse direction side. Thus, the strength or durability when the anvil 10R1 is rotated in the reverse direction in a state where the bolt is inserted into the socket 300 is improved.

That is, the strength or durability of the anvil 10R1 when rotated in the reverse direction is improved by the shape of the transition portion 130R. In the following description, the transition portion 130R is appropriately referred to as: a transition portion 130R for inversion.

In a plane parallel to the planar portion 121, the transition portion 130R for reverse rotation and the transition portion 130N for forward rotation are mirror-symmetrical (mirror-illuminated relationship). As shown in fig. 21 and 26, the transition portion 130R for inversion is: and a shape that is vertically reversed from the transition portion 130N for forward rotation.

Further, the anvil 10 shown in fig. 16, for example, has: the transition 130 has substantially the same shape as the transition 130N for normal rotation, but may have a transition 130R for reverse rotation instead of the transition 130. In this case, the concave portion 123 is formed in a mirror relationship with the example shown in fig. 16.

[ Embodiment 8]

Embodiment 8 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 27 is a perspective view of the anvil 10N2 of the present embodiment as seen from the front right. Fig. 28 is a perspective view of the anvil 10N2 from the rear left. Fig. 29 is a side view of anvil 10N 2. Fig. 30 is a cross-sectional view of anvil 10N 2.

The anvil 10N2 is: a modification of the anvil 10N1 described in embodiment 6. The anvil shaft portion 101N2 of the anvil 10N2 has a transition portion 130N for normal rotation.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N2, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10N2 is shared with the anvil 10N1 and the like described in the above embodiments.

The hub 300 is attached to the 2 nd shaft 120. The tip 140 is provided with a recess 140A. The anvil 10N2 is secured to the hub 300 by means of an annular spring.

The configuration of the 2 nd shaft portion 120 of the anvil 10N2 is different from the configuration of the 2 nd shaft portion 120 of the anvil 10N 1. The 2 nd shaft portion 120 of the anvil 10N2 is provided with: pin holes 301 into which pins are inserted. The nipple 30 is provided with: pin holes into which pins are inserted. In a state where the socket 300 is assembled to the 2 nd shaft portion 120, the socket 300 assembled to the 2 nd shaft portion 120 is fixed to the 2 nd shaft portion 120 by inserting a pin into the pin hole of the socket 300 and the pin hole 301 of the 2 nd shaft portion 120. In the following description, the manner in which the docking sleeve 300 is fixed by the pin will be appropriately referred to as: pin style.

In the embodiment, the nipple 300 is fixed to the anvil 10N2 by a composite method in which 2 fixing methods of the annular spring method and the pin method are combined.

When the bolt inserted into the socket 300 is tightened, the anvil 10N2 is rotated in the forward rotation direction. Since the anvil 10N2 has the transition portion 130N for normal rotation, strength or durability when the anvil 10N2 is selected in the normal rotation direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 9]

Embodiment 9 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 31 is a perspective view of the anvil 10R2 of the present embodiment as seen from the front right. Fig. 32 is a perspective view of the anvil 10R2 from the rear left. Fig. 33 is a side view of anvil 10R 2. Fig. 34 is a cross-sectional view of the anvil 10R 2.

The anvil 10R2 is: a modification of the anvil 10R1 described in embodiment 7. The anvil shaft portion 101R2 of the anvil 10R2 has a transition portion 130R for reversal.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10R2, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10R2 is shared with the anvil 10N1 and the like described in the above embodiments.

The hub 300 is attached to the 2 nd shaft 120. The tip 140 is provided with a recess 140A. The anvil 10R2 is secured to the hub 300 by means of an annular spring.

The configuration of the 2 nd shaft portion 120 of the anvil 10R2 is different from the configuration of the 2 nd shaft portion 120 of the anvil 10R 1. The 2 nd shaft portion 120 of the anvil 10R2 is provided with: pin holes 301 into which pins are inserted. In the embodiment, the nipple 300 is fixed to the anvil 10R2 by 2 fixing means of the annular spring means and the pin means.

When the bolt inserted into the socket 300 is loosened, the anvil 10R2 is rotated in the reverse direction. The anvil 10R2 has a transition 130R for reversal. Thus, the strength or durability when the anvil 10R2 is rotated in the reverse direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 10]

Embodiment 10 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 35 is a perspective view of the anvil 10N3 of the present embodiment as seen from the front right. Fig. 36 is a perspective view of the anvil 10N3 from the rear left. Fig. 37 is a side view of anvil 10N 3. Fig. 38 is a cross-sectional view of anvil 10N 3.

The anvil 10N3 is: a modification of the anvil 10N1 described in embodiment 6. The anvil shaft portion 101N3 of the anvil 10N3 has a transition portion 130N for normal rotation.

The anvil shaft portion 101N3 has an intermediate portion 150. The intermediate portion 150 is disposed in the axial direction: a position between the 1 st shaft portion 110 and the forward rotation transition portion 130N. The length of the anvil shaft portion 101N3 is longer than: the length of the anvil shaft portion 101N1 described in embodiment 6 above.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N3, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10N3 is shared with the anvil 10N1 and the like described in the above embodiments.

The hub 300 is attached to the 2 nd shaft 120. The tip 140 is provided with a recess 140A. The anvil 10N3 is fixed to the socket 300 by means of an annular spring.

When the bolt inserted into the socket 300 is tightened, the anvil 10N3 is rotated in the forward rotation direction. The anvil 10N3 has a forward transition 130N. Thus, the strength or durability when the anvil 10N3 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 11]

Embodiment 11 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 39 is a perspective view of the anvil 10R3 of the present embodiment as seen from the front right. Fig. 40 is a perspective view of the anvil 10R3 from the rear left. Fig. 41 is a side view of anvil 10R 3. Fig. 42 is a cross-sectional view of anvil 10R 3.

The anvil 10R3 is: a modification of the anvil 10R1 described in embodiment 7. The anvil shaft portion 101R3 of the anvil 10R3 has a transition portion 130R for reversal.

The anvil shaft portion 101R3 has an intermediate portion 150. The intermediate portion 150 is disposed in the axial direction: a position between the 1 st shaft portion 110 and the transition portion 130R for inversion. The length of the anvil shaft portion 101R3 is longer than: the length of the anvil shaft portion 101R1 described in embodiment 7 above.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10R3, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10R3 is shared with the anvil 10N1 and the like described in the above embodiments.

The hub 300 is attached to the 2 nd shaft 120. The tip 140 is provided with a recess 140A. The anvil 10R3 is secured to the hub 300 by means of an annular spring.

When the bolt inserted into the socket 300 is loosened, the anvil 10R3 is rotated in the reverse direction. The anvil 10R3 has a transition portion 130R for reversal. Thus, the strength or durability when the anvil 10R3 is rotated in the reverse direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 12]

Embodiment 12 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 43 is a perspective view of the anvil 10N4 of the present embodiment as seen from the front right. Fig. 44 is a perspective view of the anvil 10N4 from the rear left. Fig. 45 is a side view of anvil 10N 4. Fig. 46 is a cross-sectional view of anvil 10N 4.

The anvil 10N4 is: a modification of the anvil 10N1 described in embodiment 6. The anvil shaft portion 101N4 of the anvil 10N4 has a transition portion 130N for normal rotation.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N4, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10N4 is a portion common to the anvil 10N1 and the like described in the above embodiments.

The configuration of the 2 nd shaft portion 120 of the anvil 10N4 is different from the configuration of the 2 nd shaft portion 120 of the anvil 10N 1. The 2 nd shaft portion 120 of the anvil 10N4 is provided with: pin hole 302 and receiving hole 303. The receiving hole 303 extends rearward from the front end surface of the 2 nd shaft portion 120. The pin hole 302 connects the outer peripheral surface of the 2 nd shaft 120 with the housing hole 303. An elastic member (not shown) is disposed in the accommodation hole 303. The pin hole 302 supports a pin (not shown) to be movable. The elastic member generates elastic force so that the pin moves radially outward. When the socket 300 is fitted to the 2 nd shaft portion 120, the pin moves toward the radial outside, thereby fixing the socket 300 fitted to the 2 nd shaft portion 120. In the following description, the following fixing method is appropriately referred to as a pin fixing method, that is: the joint 300 is fixed by a pin movable by an elastic member.

When the bolt inserted into the socket 300 is tightened, the anvil 10N4 is rotated in the forward rotation direction. The anvil 10N4 has a forward transition 130N. Thus, the strength or durability when the anvil 10N4 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 13 ]

Embodiment 13 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 47 is a perspective view of the anvil 10R4 of the present embodiment as seen from the front right. Fig. 48 is a perspective view of the anvil 10R4 from the rear left. Fig. 49 is a side view of anvil 10R 4. Fig. 50 is a cross-sectional view of anvil 10R 4.

The anvil 10R4 is: a modification of the anvil 10R1 described in embodiment 7. The anvil shaft portion 101R4 of the anvil 10R4 has a transition portion 130R for reversal.

As in the above embodiment, at least a part of the 1 st shaft portion 110 is supported by the anvil bearing 46. The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10R4, and the 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvil 10N1 and the like described in the above embodiments are: the same construction (same shape and same size). The 1 st shaft 110, the anvil protrusion 102, and the recess 103 are: the anvil 10R4 is shared with the anvil 10N1 and the like described in the above embodiments.

The configuration of the 2 nd shaft portion 120 of the anvil 10R4 is different from the configuration of the 2 nd shaft portion 120 of the anvil 10R 1. The 2 nd shaft portion 120 of the anvil 10R4 is provided with: pin hole 302 and receiving hole 303. The hub 300 is secured to the anvil 10R4 by means of a pin securing means.

When the bolt inserted into the socket 300 is loosened, the anvil 10R4 is rotated in the reverse direction. The anvil 10R4 has a transition 130R for reversal. Thus, the strength or durability when the anvil 10R4 is rotated in the reverse direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 14 ]

Embodiment 14 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 51 is a perspective view of the anvil 10N5 of the present embodiment as seen from the front right. Fig. 52 is a perspective view of the anvil 10N5 from the rear left. Fig. 53 is a side view of anvil 10N 5. Fig. 54 is a cross-sectional view of anvil 10N 5.

The anvil 10N5 is: a modification of the anvil 10N1 described in embodiment 6. The anvil shaft portion 101N5 of the anvil 10N5 has a transition portion 130N for normal rotation. The hub 300 is fixed to the 2 nd shaft portion 120 by means of a ring spring.

The 1 st shaft portion 110 of the anvil 10N5 has a coarseness thicker than: the thickness of the 1 st shaft portion 110 of the anvil 10N1 and the like described in the above embodiments. The anvil protrusion 102 and the recess 103 of the anvil 10N5, and the anvil protrusion 102 and the recess 103 of the anvil 10 and the like described in the above embodiments are: the same construction (same shape and same size). The anvil protrusion 102 and the recess 103 are: the anvil 10N5 is a portion common to the anvil 10 and the like described in the above embodiments.

When the bolt inserted into the socket 300 is tightened, the anvil 10N5 is rotated in the forward rotation direction. The anvil 10N5 has a forward transition 130N. Thus, the strength or durability when the anvil 10N5 is rotated in the forward rotation direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 15 ]

Embodiment 15 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 55 is a perspective view of the anvil 10R5 of the present embodiment as seen from the front right. Fig. 56 is a perspective view of the anvil 10R5 from the rear left. Fig. 57 is a side view of anvil 10R 5. Fig. 58 is a cross-sectional view of anvil 10R 5.

The anvil 10R5 is: a modification of the anvil 10R1 described in embodiment 7. The anvil shaft portion 101R5 of the anvil 10R5 has a transition portion 130R for reversal. The hub 300 is fixed to the 2 nd shaft portion 120 by means of a ring spring.

The 1 st shaft portion 110 of the anvil 10R5 is thicker than: the thickness of the 1 st shaft portion 110 of the anvil 10N1 and the like described in the above embodiments. The anvil protrusion 102 and the recess 103 of the anvil 10R5, and the anvil protrusion 102 and the recess 103 of the anvil 10 and the like described in the above embodiments are: the same construction (same shape and same size). The anvil protrusion 102 and the recess 103 are: the anvil 10R5 is a portion common to the anvil 10 and the like described in the above embodiments.

When the bolt inserted into the socket 300 is loosened, the anvil 10R5 is rotated in the reverse direction. The anvil 10R5 has a transition 130R for reversal. Thus, the strength or durability when the anvil 10R5 is rotated in the reverse direction in a state where the bolt is inserted into the socket 300 is improved.

[ Embodiment 16 ]

Embodiment 16 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 59 is a diagram for explaining an anvil group according to the present embodiment. The anvil group includes: the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, 10R4, 10N5, 10R5 as described in the above embodiments.

As described in the above embodiments, the anvils 10N1, 10N2, 10N3, 10N4, 10N5 have: a forward transition portion 130N. The anvils 10R1, 10R2, 10R3, 10R4, 10R5 have: a transition portion 130R for inversion. The shape of the forward transition portion 130N is different from the shape of the reverse transition portion 130R.

The 1 st shaft portion 110, the anvil protruding portion 102, and the concave portion 103 of the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, 10R4 are: common portions of the same configuration (same shape and same size) as each other. Thus, the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, 10R4 can be replaced relative to the anvil bearing 46. The anvil bearing 46 is capable of supporting the 1 st shaft portion 110 of each of the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, 10R4. The hammer 47 is capable of striking the anvil protrusion 102 of each of the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, 10R4.

The forward transition 130N, reverse transition 130R, and 2 nd shaft 120 of the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, and 10R4 are: different portions are configured differently from each other. Thus, the operator can attach an arbitrary anvil to the impact tool 1 according to the work.

In the case of performing the bolt tightening work, by attaching the anvils 10N1, 10N2, 10N3, 10N4 having the transition portion 130N for normal rotation to the impact tool 1, the strength or durability of the anvils when rotated in the normal rotation direction is improved.

In the case of performing the bolt loosening work, the anvil 10 is rotated in the reverse direction by attaching the anvil 10R1, 10R2, 10R3, 10R4 having the transition portion 130R for reverse rotation to the impact tool 1, so that the strength and durability are improved.

Further, the common portion of the anvil group may be only: anvil projection 102 and recess 103. That is, the anvils 10N1, 10R1, 10N2, 10R2, 10N3, 10R3, 10N4, 10R4, 10N5, 10R5 may be: an anvil group.

Fig. 60 is a diagram for explaining an anvil group of the embodiment. The anvil group may have: the 2 nd shaft portion 120 is a plurality of anvils different in size from each other. In fig. 60, "yes" means: an anvil may be implemented. As shown in FIG. 60, the 2 nd shaft 120 may be 2-1/2 inch (63.5 mm), 1-1/2 inch (38.1 mm), 1 inch (25.4 mm), 3/4 inch (19.0 mm), 1/2 inch (12.7 mm), or 3/8 inch (9.5 mm). As described above, the outer shape of the cross section of the 2 nd shaft portion 120 orthogonal to the rotation axis AX is a quadrangular shape. The size of the 2 nd shaft portion 120 is: a distance between a pair of outer surfaces facing each other (a dimension of 1 planar portion 121 in the up-down direction or in the left-right direction). The socket 300 may be fixed by a pin method, a combination of a ring spring method and a pin method, a ring spring method, or a pin fixing method.

[ Embodiment 17 ]

Embodiment 17 will be described. In the following description, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and the description of the components is simplified or omitted.

Fig. 61 is a diagram for explaining the main shaft 8 and the anvil 10 of the present embodiment. In the above embodiment, the recess 103 is provided on the rear surface of the anvil 10, and the tip end portion of the spindle 8 is disposed in the recess 103. As shown in fig. 61, the anvil 10 may be provided with: a convex portion 104 protruding rearward from the rear surface of the anvil 10. The front end portion of the spindle 8 may be provided with: concave section 805. The convex portion 104 may be disposed in the concave portion 805. The protrusion 104 may be: a common portion for a plurality of anvils constituting an anvil group.

Other embodiments

In the above embodiment, the striking mechanism portion 9 may not have the hammer 47. The striking mechanism 9 can strike the anvil by an oil pulse impact method (soft impact method).

In the above embodiment, the 2 nd shaft portion 120 may have a quadrangular prism shape, a triangular prism shape, or a hexagonal prism shape. The cross-section of the 2 nd shaft portion 120 may have a regular polygonal outer shape.

In the above embodiment, the planar portion connecting portion 122 may be: corner portions connecting the 2 planar portions 121 adjacent to each other at an acute angle may be: corner portions connecting the two in an arc shape (curved surface shape).

In the above embodiment, the power source of the impact tool 1 may be not the battery pack 25 but a commercial power source (ac power source).

Claims

1. An impact wrench (1) is characterized in that,

The impact wrench (1) is provided with: a motor (6) having a rotor (27) that rotates around a rotation Axis (AX) extending in the front-rear direction; a main shaft (8) that rotates by the rotational force of the rotor (27); an anvil (10) which is disposed at a position forward of at least a part of the main shaft (8) and which has an anvil shaft portion (101) extending in an axial direction parallel to the rotation Axis (AX), and an anvil protrusion (102) protruding from the anvil shaft portion (101) toward the radial outside of the rotation Axis (AX); and a hammer (47) supported by the main shaft (8) and having a hammer projection (475) for striking the anvil projection (102) in a rotation direction,

Wherein the anvil shaft portion (101) has: a1 st shaft portion (110) having a circular cross-section orthogonal to the rotation Axis (AX); a2 nd shaft portion (120) which is disposed further forward than the 1 st shaft portion (110) and in which the cross-section has a square shape; and a transition portion (130) disposed at a position between the 1 st shaft portion (110) and the 2 nd shaft portion (120),

The 2 nd shaft portion (120) has: 4 planar portions (121) and 4 planar portion connecting portions (122), the 4 planar portions (121) each having: a1 st edge (124) which is disposed at the 1 st circumferential end of the rotation shaft (AX); and a 2 nd edge (125) which is disposed at the 2 nd circumferential end of the rotation shaft (AX),

The transition portion (130) has a support portion (131) connected to the 1 st edge (124), and is connected to the 2 nd edge (125) at a position further rearward than the support portion (131).

2. Impact wrench (1) according to claim 1, wherein,

A hub (300) can be fitted to the 2 nd shaft portion (120),

The spigots (300) are respectively contacted with the 4 supporting parts (131).

3. Impact wrench (1) according to claim 2, wherein,

When a bolt inserted into the nipple (300) is tightened, the anvil (10) is rotated toward the 1 st circumferential direction.

4. An impact wrench (1) according to claim 3, wherein,

The transition portion (130) has: a connection portion (135) connected to the 2 nd edge (125),

The connection section (135) is configured to: is positioned further rearward than the support portion (131),

The socket (300) is in contact with the 4 support portions (131) and is not in contact with the 4 connection portions (135), respectively.

5. Impact wrench (1) according to claim 4, wherein,

The transition portion (130) has: a curved surface portion (132) provided between the connection portion (135) and the support portion (131) and connected to the planar portion (121),

The nipple (300) is not in contact with the curved surface portion (132).

6. Impact wrench (1) according to any one of claims 1-5, wherein,

The impact wrench (1) further comprises: an anvil bearing (46) for supporting at least a portion of the 1 st shaft portion (110).

7. An impact wrench (1) is characterized in that,

Regarding the transition portion (130), a 1 st part (1301) which is located on the 1 st circumferential side with respect to a center line (CX) of the planar portion (121) in the circumferential direction and which is connected to the 1 st edge (124) has a shape different from that of the 1 st part in a plane parallel to the planar portion (121): a shape of a2 nd portion (1302) which is located on a2 nd circumferential side with respect to the center line (CX) and is connected to the 2 nd edge (125).

8. Impact wrench (1) according to claim 7, wherein,

The transition portion (130) has: and a support portion (131) connected to the 1 st edge (124) and connected to the 2 nd edge (125) at a position rearward of the support portion (131).

9. Impact wrench (1) according to claim 8, wherein,

The transition portion (130) has: a connection part (135) connected to the 2 nd edge (125) and disposed at a position further rearward than the support part (131),

A hub (300) can be fitted to the 2 nd shaft portion (120),

The nipple (300) is in contact with the support portion (131) and is not in contact with the connection portion (135).

10. Impact wrench (1) according to claim 9, wherein,

In the axial direction, a recess (123) is arranged between the transition portion (130) and the planar portion (121),

The recess (123) connects the 1 st edge (124) and the 2 nd edge (125),

A front side edge (123A) for defining a front end portion of the recess (123) and a rear side edge (123B) for defining a rear end portion of the recess (123) are parallel to each other,

The position of the 1 st end of the front side edge (123A) connected to the 1 st edge (124) is different from the position of the 2 nd end of the front side edge (123A) connected to the 2 nd edge (125),

In the axial direction, the distance (La) between the support portion (131) and the 1 st end of the front side edge (123) is: a distance (Lb) between a front end portion of the anvil (10) and a rear end portion of the transition portion (130) is 1/6 or more and 1/5 or less.

11. Impact wrench (1) according to claim 10, characterised in that,

An angle (θ) formed by a reference line perpendicular to the center line (CX) and the front side edge (123) is 15 DEG to 25 deg.

12. An impact wrench (1) is characterized in that,

The impact wrench (1) is provided with: a motor (6) having a rotor (27) that rotates around a rotation Axis (AX) extending in the front-rear direction; a main shaft (8) that rotates by the rotational force of the rotor (27); an anvil (10) which is disposed at a position forward of at least a part of the main shaft (8) and which has an anvil shaft portion (101) extending in an axial direction parallel to the rotation Axis (AX), and an anvil protrusion (102) protruding from the anvil shaft portion (101) toward the radial outside of the rotation Axis (AX); a hammer (47) which is supported by the main shaft (8) and has a hammer projection (475) that strikes the anvil projection (102) in the rotational direction; and an anvil bearing (46) which supports the anvil (10),

The 2 nd shaft portion (120) has: 4 planar parts (121) and 4 planar part connecting parts (122),

The anvil (10) has: a1 st anvil in which the transition portion (130) has a1 st shape, and a2 nd anvil in which the transition portion (130) has a2 nd shape,

The 1 st anvil and the 2 nd anvil can be replaced relative to the anvil bearing (46).

13. Impact wrench (1) according to claim 12, characterised in that,

The 4 planar portions (121) each have: a1 st edge (124) which is disposed at the 1 st circumferential end of the rotation shaft (AX); and a2 nd edge (125) which is disposed at the 2 nd circumferential end of the rotation shaft (AX),

14. Impact wrench (1) according to claim 13, characterised in that,

A hub (300) can be fitted to the 2 nd shaft portion (120),

15. Impact wrench (1) according to claim 14, wherein,

When a bolt inserted into the socket (300) is fastened, the socket is rotated toward the 1 st circumferential direction.

16. Impact wrench (1) according to claim 14, wherein,

When the bolt inserted into the socket (300) is loosened, the bolt is rotated toward the 2 nd circumferential direction.