Impact tool

Abstract

To fasten with a predetermined torque width, in impact tools having various forms.SOLUTION: An impact tool includes: a housing; a motor housed in the housing; a hammer rotated by the motor; an anvil stroke in a rotation direction by the hammer; a hammer case storing the hammer; a first sensor for detecting the rotation of the anvil; a second sensor for detecting the movement of the hammer; and a controller for controlling a fastening torque, on the basis of detection data of the first sensor and the second sensor. The anvil has a bit hole to which the tip tool is inserted.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Bolts used to fasten structures and the like are sometimes tightened within a predetermined torque range. For example, Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2023 / 0302611 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the prior art, T-handle type impact wrenches were tightened within a predetermined torque range. There are various types of impact tools, and tightening them to a predetermined torque has not been taken into consideration at all.

[0005] The technology disclosed in this specification aims to enable various types of impact tools to be tightened within a predetermined torque range. [Means for solving the problem]

[0006] This specification discloses an impact tool. The impact tool includes a housing, a motor accommodated in the housing, a hammer rotated by the motor, an anvil struck in the rotational direction by the hammer, a hammer case accommodating the hammer, a first sensor that detects rotation of the anvil, a second sensor that detects movement of the hammer, and a controller that controls tightening torque based on detection data from the first and second sensors. The anvil has a bit hole into which a tool bit is inserted. [Effects of the Invention]

[0007] According to the above configuration, various types of impact tools can be tightened within a predetermined torque range. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing an impact tool according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing the impact tool according to the first embodiment. [Figure 3] FIG. 3 is a vertical cross-sectional view showing an upper portion of the impact tool according to the first embodiment. [Figure 4] FIG. 4 is a perspective cross-sectional view showing an upper portion of the impact tool according to the first embodiment. [Figure 5] FIG. 5 is a vertical cross-sectional view showing the tool holding mechanism according to the first embodiment. [Figure 6] FIG. 6 is a block diagram showing a controller according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing the upper part of the impact tool according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing the upper part of the impact tool according to the first embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing the upper part of the impact tool according to the first embodiment. [Figure 10] FIG. 10 is a rear perspective view showing the anvil and the first sensor board according to the first embodiment. [Figure 11] FIG. 11 is a front perspective view showing the anvil and the first sensor substrate according to the first embodiment. [Figure 12] FIG. 12 is a perspective view showing the first sensor substrate according to the first embodiment, seen from behind. [Figure 13] FIG. 13 is a rear perspective view showing the operation of the anvil according to the first embodiment. [Figure 14] FIG. 14 is a rear perspective view showing the operation of the anvil according to the first embodiment. [Figure 15] FIG. 15 is a perspective view from behind showing the hammer and the second sensor board according to the first embodiment. [Figure 16] FIG. 16 is a front perspective view showing the hammer and the second sensor board according to the first embodiment. [Figure 17] FIG. 17 is a perspective view of the second sensor substrate according to the first embodiment, seen from the front. [Figure 18] FIG. 18 is a perspective view from behind showing the operation of the hammer according to the first embodiment. [Figure 19] FIG. 19 is a perspective view from behind showing the operation of the hammer according to the first embodiment. [Figure 20] FIG. 20 is a perspective view showing the hammer case 4 according to the first embodiment, viewed from below. [Figure 21] FIG. 21 is a side view showing an impact tool according to the second embodiment. [Figure 22] FIG. 22 is a cross-sectional view showing an impact tool according to the second embodiment. [Figure 23] FIG. 23 is a vertical cross-sectional view showing an upper portion of an impact tool according to the second embodiment. [Figure 24] FIG. 24 is a perspective cross-sectional view showing an upper portion of an impact tool according to the second embodiment. [Figure 25] FIG. 25 is a rear perspective view showing the anvil and the first sensor board according to the second embodiment. [Figure 26] FIG. 26 is a front perspective view showing an anvil and a first sensor board according to the second embodiment. [Figure 27] FIG. 27 is a perspective view showing the first sensor board according to the second embodiment, seen from behind. [Figure 28] FIG. 28 is a rear perspective view showing the hammer and the second sensor board according to the second embodiment. [Figure 29] FIG. 29 is a front perspective view showing a hammer and a second sensor board according to the second embodiment. [Figure 30] FIG. 30 is a perspective view of the second sensor substrate according to the second embodiment, seen from the front. [Figure 31] FIG. 31 is a perspective view showing the hammer case according to the second embodiment, seen from below. [Figure 32] FIG. 32 is a side view showing an impact tool according to the third embodiment. [Figure 33] FIG. 33 is a cross-sectional view showing an impact tool according to a third embodiment. [Figure 34] FIG. 34 is a vertical cross-sectional view showing an upper portion of an impact tool according to a third embodiment. [Figure 35] FIG. 35 is a perspective cross-sectional view showing an upper portion of an impact tool according to a third embodiment. [Figure 36] FIG. 36 is a rear perspective view showing the anvil and the first sensor board according to the third embodiment. [Figure 37] FIG. 37 is a front perspective view showing the anvil and the first sensor board according to the third embodiment. [Figure 38] FIG. 38 is a perspective view showing the first sensor board according to the third embodiment, seen from behind. [Figure 39] FIG. 39 is a rear perspective view showing the hammer and the second sensor board according to the third embodiment. [Figure 40] FIG. 40 is a front perspective view showing the hammer and the second sensor board according to the third embodiment. [Figure 41] FIG. 41 is a perspective view of the second sensor substrate according to the third embodiment, seen from the front. [Figure 42]FIG. 42 is a perspective view showing the hammer case according to the third embodiment, seen from below. [Figure 43] FIG. 43 is a side view showing an impact tool according to a fourth embodiment. [Figure 44] FIG. 44 is a cross-sectional view showing an impact tool according to the fourth embodiment. [Figure 45] FIG. 45 is a vertical cross-sectional view showing a front part of an impact tool according to a fourth embodiment. [Figure 46] FIG. 46 is a perspective cross-sectional view showing a front part of an impact tool according to a fourth embodiment. [Figure 47] FIG. 47 is a rear perspective view showing the anvil and the first sensor board according to the fourth embodiment. [Figure 48] FIG. 48 is a front perspective view showing the anvil and the first sensor board according to the fourth embodiment. [Figure 49] FIG. 49 is a perspective view showing the first sensor board according to the fourth embodiment, as seen from behind. [Figure 50] FIG. 50 is a rear perspective view showing the hammer and the second sensor board according to the fourth embodiment. [Figure 51] FIG. 51 is a front perspective view showing a hammer and a second sensor board according to the fourth embodiment. [Figure 52] FIG. 52 is a perspective view of the second sensor substrate according to the fourth embodiment, seen from the front. [Figure 53] FIG. 53 is a perspective view showing the hammer case according to the third embodiment, viewed from below. [Figure 54] FIG. 54 is a side view showing an impact tool according to the fifth embodiment. [Figure 55] FIG. 55 is a cross-sectional view showing an impact tool according to the fifth embodiment. [Figure 56] FIG. 56 is a vertical cross-sectional view showing the front part of the impact tool according to the fifth embodiment. [Figure 57] FIG. 57 is a perspective cross-sectional view showing a front part of an impact tool according to a fifth embodiment. [Figure 58]FIG. 58 is a rear perspective view showing the anvil and first sensor board according to the fifth embodiment. [Figure 59] FIG. 59 is a front perspective view showing the anvil and the first sensor board according to the fifth embodiment. [Figure 60] FIG. 60 is a rear perspective view showing the first sensor board according to the fifth embodiment. [Figure 61] FIG. 61 is a rear perspective view showing the hammer and the second sensor board according to the fifth embodiment. [Figure 62] FIG. 62 is a front perspective view showing a hammer and a second sensor board according to the fifth embodiment. [Figure 63] FIG. 63 is a perspective view of the second sensor substrate according to the fifth embodiment, seen from the front. [Figure 64] FIG. 64 is a perspective view showing the hammer case according to the fifth embodiment, viewed from below. [Figure 65] FIG. 65 is a cross-sectional view showing an impact tool according to the sixth embodiment. [Figure 66] FIG. 66 is a cross-sectional view showing an impact tool according to the seventh embodiment. [Figure 67] FIG. 67 is a cross-sectional view showing an impact tool according to the eighth embodiment. [Figure 68] FIG. 68 is a cross-sectional view showing an impact tool according to the ninth embodiment. [Figure 69] FIG. 69 is a cross-sectional view showing an impact tool according to a tenth embodiment. [Figure 70] FIG. 70 is a cross-sectional view showing an impact tool according to an eleventh embodiment. [Figure 71] FIG. 71 is a perspective view showing a first sensor substrate according to the twelfth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. In the embodiments, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the center of the impact tool.

[0010] [First embodiment] Fig. 1 is a side view showing an impact tool 1A according to an embodiment. Fig. 2 is a cross-sectional view showing the impact tool 1A according to an embodiment. Fig. 3 is a vertical cross-sectional view showing an upper part of the impact tool 1A according to an embodiment. Fig. 4 is a perspective cross-sectional view showing an upper part of the impact tool 1A according to an embodiment.

[0011] In the embodiment, the impact tool 1A is a power tool having an electric motor 6 as a power source. A direction parallel to the rotation axis AX of the motor 6 is referred to as the axial direction, a direction circumferentially around the rotation axis AX is referred to as the circumferential direction or rotation direction, and a radial direction of the rotation axis AX is referred to as the radial direction. In the radial direction, a position close to or approaching the rotation axis AX is referred to as the radially inner side or inner circumferential side, and a position farther from or away from the rotation axis AX is referred to as the radially outer side or outer circumferential side. In the embodiment, the rotation axis AX extends in the front-to-rear direction. One axial side is the front side (forward), and the other axial side is the rear side (rear).

[0012] In the embodiment, the impact tool 1A is an impact driver. The maximum tightening torque of the impact driver is approximately 150 Nm or more and 250 Nm or less. The impact tool 1A includes a housing 2, a rear cover 3, a hammer case 4, a cover 5, a motor 6, a speed reduction mechanism 7, a spindle 8, a striking mechanism 9, an anvil 10, a fan 12, a battery mounting portion 13, a trigger lever 14, a forward / reverse rotation switching lever 15, a tool holding mechanism 16 (bit sleeve), a light unit 17, a first sensor board 80, a second sensor board 90, and a controller 18.

[0013] The housing 2 is made of synthetic resin. In this embodiment, the housing 2 is made of nylon. The housing 2 is composed of a pair of left and right half housings. The pair of half housings are fixed together by a plurality of screws 2S.

[0014] The housing 2 has a motor accommodating portion 21, a grip portion 22, and a battery holding portion 23.

[0015] The motor accommodating portion 21 is cylindrical and accommodates the motor 6. The motor accommodating portion 21 accommodates the motor 6, a part of the bearing box 24, and the rear part of the hammer case 4.

[0016] The grip portion 22 extends downward from the motor housing portion 21. The trigger lever 14 is provided on the upper portion of the grip portion 22. The grip portion 22 is held by an operator.

[0017] The battery holding portion 23 is connected to the lower end of the grip portion 22. The outer dimensions of the battery holding portion 23 are larger than the outer dimensions of the grip portion 22 in both the front-rear direction and the left-right direction.

[0018] The rear cover 3 is made of synthetic resin. The rear cover 3 is disposed behind the motor housing portion 21. The rear cover 3 accommodates at least a portion of the fan 12. The fan 12 is disposed on the inner peripheral side of the rear cover 3. The rear cover 3 is disposed so as to cover the opening at the rear end of the motor housing portion 21. The rear cover 3 is fixed to the rear end of the motor housing portion 21 with screws 3S.

[0019] The motor accommodating section 21 has an air intake port 19. The rear cover 3 has an air exhaust port 20. Air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 19. Air from the internal space of the housing 2 flows out to the external space of the housing 2 through the air exhaust port 20.

[0020] The hammer case 4 functions as a gear case that houses the reduction mechanism 7. The hammer case 4 houses the reduction mechanism 7. The hammer case 4 houses the spindle 8. The hammer case 4 houses the striking mechanism 9. The hammer case 4 houses a part of the anvil 10. The hammer case 4 is made of metal. In this embodiment, the hammer case 4 is made of aluminum. The hammer case 4 is cylindrical.

[0021] The hammer case 4 includes a rear-side tubular portion 4A, a front-side tubular portion 4B, and an annular portion 4C. The front-side tubular portion 4B is disposed forward of the rear-side tubular portion 4A. The outer diameter of the rear-side tubular portion 4A is larger than the outer diameter of the front-side tubular portion 4B. The inner diameter of the rear-side tubular portion 4A is larger than the inner diameter of the front-side tubular portion 4B. The annular portion 4C is disposed to connect the front end of the rear-side tubular portion 4A and the rear end of the front-side tubular portion 4B.

[0022] The hammer case 4 is connected to the front part of the motor housing part 21. The motor housing part 21 is fixed to the rear part of the hammer case 4.

[0023] A bearing box 24 is fixed to the rear of the rear cylindrical portion 4A. At least a part of the reduction gear mechanism 7 is disposed inside the bearing box 24. A part of the bearing box 24 and the rear part of the rear cylindrical portion 4A are housed in the motor housing portion 21. The bearing box 24 is fixed to both the motor housing portion 21 and the hammer case 4.

[0024] The cover 5 is disposed so as to cover the outer surface of the rear cylindrical portion 4A of the hammer case 4.

[0025] The motor 6 is a power source of the impact tool 1A. The motor 6 generates a rotational force. The motor 6 is an electric motor. The motor 6 is an inner rotor type brushless motor. The motor 6 is accommodated in the motor accommodating portion 21 of the housing 2.

[0026] The motor 6 has a stator 26 and a rotor 27. The stator 26 is supported by the motor housing portion 21. At least a portion of the rotor 27 is disposed inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates about a rotation axis AX extending in the front-rear direction.

[0027] The stator 26 includes a stator core 28 , a front insulator 29 , a rear insulator 30 , and a coil 31 .

[0028] The stator core 28 is disposed radially outward of the rotor 27. The stator core 28 includes a plurality of stacked steel plates. The steel plates are metal plates whose main component is iron. The stator core 28 is cylindrical. The stator core 28 has a plurality of teeth that support the coils 31.

[0029] The front insulator 29 is provided in the front portion of the stator core 28. The rear insulator 30 is provided in the rear portion of the stator core 28. The front insulator 29 and the rear insulator 30 are each an electrical insulating member made of synthetic resin. The front insulator 29 is arranged so as to cover part of the surface of the teeth. The rear insulator 30 is arranged so as to cover part of the surface of the teeth.

[0030] The coils 31 are attached to the stator core 28 via the front insulators 29 and the rear insulators 30. Multiple coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulators 29 and the rear insulators 30. The coils 31 and the stator core 28 are electrically insulated by the front insulators 29 and the rear insulators 30.

[0031] The rotor 27 rotates about a rotation axis AX and includes a rotor core portion 32, a rotor shaft portion 33, a rotor magnet , and a sensor magnet .

[0032] The rotor core portion 32 and the rotor shaft portion 33 are each made of steel. In this embodiment, the rotor core portion 32 and the rotor shaft portion 33 are integral. A front portion of the rotor shaft portion 33 protrudes forward from the front end surface of the rotor core portion 32. A rear portion of the rotor shaft portion 33 protrudes rearward from the rear end surface of the rotor core portion 32.

[0033] The rotor magnet 34 is fixed to the rotor core portion 32. The rotor magnet 34 is cylindrical. The rotor magnet 34 is arranged around the rotor core portion 32.

[0034] The sensor magnet 35 is fixed to the rotor core portion 32. The sensor magnet 35 has an annular shape. The sensor magnet 35 is disposed on the front end surface of the rotor core portion 32 and the front end surface of the rotor magnet 34.

[0035] A sensor board 37 is attached to the front insulator 29. The sensor board 37 is fixed to the front insulator 29 with screws 29S. The sensor board 37 has an annular circuit board and a magnetic sensor supported by the circuit board. At least a portion of the sensor board 37 faces the sensor magnet 35. The magnetic sensor detects the position of the sensor magnet 35, thereby detecting the position of the rotor 27 in the rotational direction.

[0036] The rear portion of the rotor shaft portion 33 is rotatably supported by a rotor bearing 39. The front portion of the rotor bearing 39 is rotatably supported by a rotor bearing 40. The rotor bearing 39 is held by the rear cover 3. The rotor bearing 40 is held by the bearing box 24. The front end portion of the rotor shaft portion 33 is disposed in the internal space of the hammer case 4 through the opening of the bearing box 24.

[0037] A pinion gear 41 is formed on the front end of the rotor shaft portion 33. The pinion gear 41 is connected to at least a part of the reduction mechanism 7. The rotor shaft portion 33 is connected to the reduction mechanism 7 via the pinion gear 41.

[0038] The reduction mechanism 7 transmits the rotational force of the motor 6 to the spindle 8 and the anvil 10. The reduction mechanism 7 is housed in the rear cylindrical portion 4A of the hammer case 4. The reduction mechanism 7 has a plurality of gears. The reduction mechanism 7 is disposed forward of the motor 6. The reduction mechanism 7 connects the rotor shaft portion 33 and the spindle 8. The gears of the reduction mechanism 7 are driven by the rotor 27. The reduction mechanism 7 transmits the rotation of the rotor 27 to the spindle 8. The reduction mechanism 7 rotates the spindle 8 at a rotational speed lower than the rotational speed of the rotor shaft portion 33. The reduction mechanism 7 includes a planetary gear mechanism.

[0039] The reduction mechanism 7 has a plurality of planetary gears 42 arranged around a pinion gear 41, and an internal gear 43 arranged 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 and the bearing box 24, respectively. Each of the plurality of planetary gears 42 meshes with the pinion gear 41. The planetary gear 42 is rotatably supported on the spindle 8 via a pin 42P. The spindle 8 is rotated by the planetary gear 42. The internal gear 43 has internal teeth that mesh with the planetary gear 42. The internal gear 43 is fixed to the bearing box 24. The internal gear 43 is always non-rotatable relative to the bearing box 24.

[0040] When the rotor shaft portion 33 is rotated by the drive of the motor 6, the pinion gear 41 rotates, 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. Due to the revolution of the planetary gear 42, the spindle 8 connected to the planetary gear 42 via the pin 42P rotates at a rotational speed lower than the rotational speed of the rotor shaft portion 33.

[0041] The spindle 8 rotates due to the rotational force of the motor 6. The spindle 8 is disposed forward of at least a portion of the motor 6. The spindle 8 is disposed forward of the stator 26. At least a portion of the spindle 8 is disposed forward of the rotor 27. At least a portion of the spindle 8 is disposed forward of the reduction mechanism 7. The spindle 8 is rotated by the rotor 27. The spindle 8 rotates due to the rotational force of the rotor 27 transmitted by the reduction mechanism 7.

[0042] The spindle 8 has a flange portion 8A and a spindle shaft portion 8B that protrudes forward from the flange portion 8A. The planetary gear 42 is rotatably supported on the flange portion 8A 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 around the rotation axis AX.

[0043] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is held in the bearing box 24. The spindle 8 has a circular ring portion 8C that protrudes rearward from the rear portion of the flange portion 8A. The spindle bearing 44 is disposed inside the circular ring portion 8C. In this embodiment, the outer ring of the spindle bearing 44 is connected to the circular ring portion 8C, and the inner ring of the spindle bearing 44 is supported by the bearing box 24.

[0044] The striking mechanism 9 is driven by a motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via a reduction mechanism 7 and a spindle 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the spindle 8 rotated by the motor 6. The striking mechanism 9 has a hammer 47, a ball 48, and a coil spring 49. The striking mechanism 9 including the hammer 47 is housed in a hammer case 4.

[0045] The hammer 47 is disposed forward of the reduction mechanism 7. The hammer 47 is housed in the rear cylindrical portion 4A. The hammer 47 is disposed around the spindle shaft portion 8B. The hammer 47 is held by the spindle shaft portion 8B. The ball 48 is disposed between the spindle shaft portion 8B and the hammer 47. The coil spring 49 is supported by each of the flange portion 8A and the hammer 47.

[0046] The hammer 47 has a body portion 47D, a hammer groove 47A, and a hammer protrusion 47B (see Figure 16). The body portion 47D is arranged around the spindle shaft portion 8B. The body portion 47D is annular. A recess 47C is provided at the rear portion of the body portion 47D. The recess 47C is provided so as to recess forward from the rear end portion of the body portion 47D. The recess 47C is ring-shaped. The hammer protrusion 47B protrudes forward from the body portion 47D. Two hammer protrusions 47B are provided.

[0047] 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 can rotate 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 with each other. The hammer 47 rotates around the rotation axis AX.

[0048] The ball 48 is made of a metal such as steel. The ball 48 is disposed between the spindle shaft portion 8B and the hammer 47. The spindle 8 has a spindle groove 8D in which at least a portion of the ball 48 is disposed. The spindle groove 8D is provided on a portion of the outer circumferential surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47A in which at least a portion of the ball 48 is disposed. The hammer groove 47A is provided on a portion of the inner surface of the body portion 47D. The ball 48 is disposed between the spindle groove 8D and the hammer groove 47A. The ball 48 can roll inside the spindle groove 8D and inside the hammer groove 47A. The hammer 47 is movable along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial and rotational directions within a movable range defined by the spindle groove 8D and the hammer groove 47A.

[0049] The coil spring 49 generates an elastic force that moves the hammer 47 forward. The coil spring 49 is disposed between the flange portion 8A and the hammer 47. A ring-shaped recess 47C is provided on the rear surface of the hammer 47. The recess 47C is recessed forward from the rear surface of the hammer 47. A washer 45 is provided inside the recess 47C. The washer 45 is supported by the body portion 47D via a ball 50. The rear end of the coil spring 49 is supported by the flange portion 8A. The front end of the coil spring 49 is disposed inside the recess 47C and supported by the washer 45.

[0050] The anvil 10 is an output part of the impact tool 1A that is actuated by the rotational force of the motor 6. The anvil 10 is rotated by the rotational force of the motor 6. At least a portion of the anvil 10 is disposed forward of the hammer 47.

[0051] The anvil 10 has a rod-shaped anvil shaft portion 10A and an anvil protrusion portion 10B. The anvil 10 has a bit hole 10C into which a tool bit (driver bit) is inserted. The bit hole 10C is provided to extend rearward from the front end of the anvil shaft portion 10A. The tool bit is held by the tool holding mechanism 16 while inserted into the bit hole 10C. A recess is provided at the rear end of the anvil 10. A protrusion is provided at the front end of the spindle shaft portion 8B. The protrusion at the front end of the spindle shaft portion 8B is inserted into a recess provided at the rear end of the anvil 10. The anvil protrusion portion 10B is provided at the rear end of the anvil 10. The anvil protrusion portion 10B protrudes radially outward from the rear end of the anvil shaft portion 10A.

[0052] The anvil 10 is rotatably supported by an 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 are all coincident. The anvil 10 rotates around the rotation axis AX. The anvil bearing 46 is arranged inside the front cylindrical portion 4B. The anvil bearing 46 is held in the front cylindrical portion 4B of the hammer case 4. The front cylindrical portion 4B is arranged around the anvil shaft portion 10A. The anvil bearing 46 rotatably supports the anvil shaft portion 10A. In this embodiment, a pair of anvil bearings 46 are arranged in the front-to-rear direction.

[0053] The hammer protrusion 47B can come into contact with the anvil protrusion 10B. When the motor 6 is driven while the hammer protrusion 47B and the anvil protrusion 10B are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0054] The anvil 10 is struck in the rotational direction by the hammer 47. For example, during a screw tightening operation, if the load acting on the anvil 10 becomes too high, a situation may arise in which the anvil 10 cannot be rotated by the power generated by the motor 6 alone. When the power generated by the motor 6 alone is no longer sufficient to rotate the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are movable relative to each other in the axial and circumferential directions via the ball 48. Even after the rotation of the hammer 47 stops, the rotation of the spindle 8 continues by the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the ball 48 moves rearward while being guided by the spindle groove 8D and the hammer groove 47A. The hammer 47 receives force from the ball 48 and moves rearward along with the ball 48. In other words, when the rotation of the anvil 10 is stopped, the hammer 47 moves rearward due to the rotation of the spindle 8. As the hammer 47 moves rearward, the contact between the hammer protrusion 47B and the anvil protrusion 10B is released.

[0055] The coil spring 49 generates an elastic force that moves the hammer 47 forward. After moving backward, the hammer 47 moves forward due to the elastic force of the coil spring 49. As the hammer 47 moves forward, it receives a rotational force from the ball 48. That is, the hammer 47 moves forward while rotating. As the hammer 47 moves forward while rotating, the hammer protrusion 47B comes into contact with the anvil protrusion 10B while rotating. As a result, the anvil protrusion 10B is struck in the rotational direction by the hammer protrusion 47B. Both the power of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. Therefore, the anvil 10 can rotate around the rotation axis AX with high torque.

[0056] The fan 12 rotates due to the rotational force of the motor 6. The fan 12 is disposed rearward of the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the rear of the rotor shaft 33 via a bushing 12A. The fan 12 is disposed between the rotor bearing 39 and the stator 26. The fan 12 rotates due to the rotation of the rotor 27. As the rotor shaft 33 rotates, the fan 12 rotates together with the rotor shaft 33. As the fan 12 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake 19. The air that has flowed into the internal space of the housing 2 circulates through the internal space of the housing 2, thereby cooling the motor 6. As the fan 12 rotates, the air that has circulated through the internal space of the housing 2 flows out into the external space of the housing 2 through the air exhaust 20.

[0057] The battery attachment section 13 is disposed below the battery holding section 23. A battery pack 25 is attached to the battery attachment section 13. The battery pack 25 is detachable from the battery attachment section 13. The battery pack 25 functions as a power source for the impact tool 1A. The battery pack 25 includes a secondary battery. In the embodiment, the battery pack 25 includes a rechargeable lithium-ion battery. When attached to the battery attachment section 13, the battery pack 25 can supply power to the impact tool 1A. The motor 6 and the light unit 17 are each driven by the power supplied from the battery pack 25.

[0058] The trigger lever 14 is provided on the grip portion 22. The trigger lever 14 is operated by an operator to start the motor 6. The switch body 11 is disposed at the rear of the trigger lever 14. The switch body 11 is disposed inside the grip portion 22. The switch body 11 is operated by operating the trigger lever 14. The operation of the switch body 11 generates a trigger signal. The controller 18 switches between driving and stopping the motor 6 based on the trigger signal.

[0059] The forward / reverse switching lever 15 is provided on the upper part of the grip portion 22. The forward / reverse switching lever 15 is operated by an operator. By operating the forward / reverse switching lever 15, the rotation direction of the motor 6 is switched from one of the forward direction and the reverse direction to the other. By switching the rotation direction of the motor 6, the rotation direction of the spindle 8 is switched.

[0060] 5 is a longitudinal cross-sectional view showing the tool holding mechanism 16 according to the embodiment. The anvil 10 has a bit hole 10C into which a tool bit (driver bit) is inserted. The bit hole 10C is provided so as to extend rearward from the front end of the anvil shaft portion 10A. The tool bit is held by the tool holding mechanism 16 while inserted into the bit hole 10C.

[0061] The tool holding mechanism 16 is disposed around the front of the anvil 10. The tool holding mechanism 16 holds a tool bit inserted into a bit hole 10C of the anvil 10. The tool holding mechanism 16 is capable of attaching and detaching a tool bit.

[0062] The tool holding mechanism 16 includes a ball 16A, a leaf spring 16B, a sleeve 16C, a coil spring 16D, a positioning member 16E, a washer 16F, and a support ring 16G.

[0063] The anvil 10 has a support recess 10D that supports the ball 16A. The support recess 10D is formed on the outer circumferential surface of the anvil shaft portion 10A. In this embodiment, two support recesses 10D are formed in the anvil shaft portion 10A.

[0064] The balls 16A are movably supported on the anvil 10. The balls 16A are arranged in the support recesses 10D. One ball 16A is arranged in each support recess 10D.

[0065] A through hole is formed in the anvil shaft portion 10A, connecting the inner surface of the support recess 10D and the inner surface of the bit hole 10C. The ball 16A is supported by the support recess 10D and is disposed inside the bit hole 10C through at least a portion of the through hole. The ball 16A can fix a tool bit inserted into the bit hole 10C. The ball 16A is movable between an engagement position where the tool bit is fixed and a release position where the tool bit is released from the engagement position.

[0066] The leaf spring 16B generates an elastic force that moves the ball 16A to the engagement position. The leaf spring 16B is disposed around the anvil shaft portion 10A. The leaf spring 16B generates an elastic force that moves the ball 16A radially inward.

[0067] The sleeve 16C is a substantially cylindrical member. The sleeve 16C is disposed around the anvil shaft portion 10A. The sleeve 16C is axially movable around the anvil shaft portion 10A. The sleeve 16C can prevent the ball 16A, which is disposed in the engagement position, from escaping from the engagement position. By moving the sleeve 16C in the axial direction, the ball 16A can be changed to a state in which it can be moved from the engagement position to the release position.

[0068] The sleeve 16C has a cylindrical portion 16H and a protruding portion 16J that protrudes radially inward from the inner circumferential surface of the cylindrical portion 16H. The protruding portion 16J is disposed in the middle of the cylindrical portion 16H in the front-rear direction. The protruding portion 16J has a support surface 16K that faces forward.

[0069] The sleeve 16C is movable around the anvil shaft portion 10A between a blocking position that blocks radially outward movement of the balls 16A and an allowable position that allows radially outward movement of the balls 16A. The blocking position is set rearward of the allowable position. The sleeve 16C is positioned at the allowable position by being moved forward.

[0070] By positioning the sleeve 16C in the blocking position, the ball 16A, which is positioned in the engagement position, is prevented from moving radially outward. That is, by positioning the sleeve 16C in the blocking position, the ball 16A, which is positioned in the engagement position, is prevented from escaping from the engagement position. By positioning the sleeve 16C in the blocking position, the bit is maintained in a state where it is fixed by the ball 16A.

[0071] When the sleeve 16C is moved to the allowable position, the ball 16A, which is located at the engagement position, is allowed to move radially outward. When the sleeve 16C is moved to the allowable position, the ball 16A is allowed to move from the engagement position to the release position. In other words, when the sleeve 16C is placed at the allowable position, the ball 16A, which is located at the engagement position, is allowed to move out of the engagement position. When the sleeve 16C is placed at the allowable position, the state in which the tool bit is fixed by the ball 16A can be released.

[0072] The coil spring 16D generates an elastic force that moves the sleeve 16C to the blocking position. The coil spring 16D is disposed around the anvil shaft portion 10A. The blocking position is set rearward of the allowable position. The coil spring 16D generates an elastic force that moves the sleeve 16C rearward.

[0073] The front end of the coil spring 16D is supported by a washer 16F. The front surface of the washer 16F is supported by a support ring 16G. The support ring 16G is disposed in a retaining groove 10E provided at the front end of the outer circumferential surface of the anvil shaft portion 10A. The rear end of the coil spring 16D is supported by a support surface 16H of the sleeve 16C.

[0074] The positioning member 16E is a ring-shaped member fixed to the outer peripheral surface of the anvil shaft portion 10A. The positioning member 16E is fixed at a position where it can face the rear end of the sleeve 16C. The positioning member 16E positions the sleeve 16C at the blocking position. The sleeve 16C, which is given an elastic force moving rearward by the coil spring 16D, is positioned at the blocking position by contacting the positioning member 16E.

[0075] The light unit 17 emits illumination light. The light unit 17 illuminates the anvil 10 and the periphery of the anvil 10 with the illumination light. The light unit 17 illuminates the front end side of the anvil 10 with the illumination light. The light unit 17 includes chip on board light emitting diodes (COB LEDs).

[0076] The light unit 17 is disposed in the front part of the hammer case 4. The light unit 17 is disposed around the front cylinder portion 4B. The light unit 17 is disposed around the anvil shaft portion 10A via the front cylinder portion 4B.

[0077] The controller 18 includes a computer system. The controller 18 outputs control commands to control at least the motor 6 and the light unit 17. As shown in Fig. 2, the controller 18 is housed in the battery holding section 23 while being held in a controller case 18A. The controller 18 includes a circuit board 18B on which multiple electronic components are mounted, and a molded resin 18C that covers the circuit board 18B.

[0078] 6 is a block diagram showing the controller 18 according to the embodiment. As shown in FIGS. 2 and 6, the controller 18 includes a microcomputer 18D and a control circuit 18E. The microcomputer 18D and the control circuit 18E are disposed on a circuit board 18B.

[0079] The microcomputer 18D has a processor 18F such as a CPU (Central Processing Unit), a non-volatile memory 18G such as a ROM (Read Only Memory) or storage, and a volatile memory 18H such as a RAM (Random Access Memory).

[0080] The control circuit 18E includes a plurality of electronic components. The control circuit 18E includes six switch elements 18J, a capacitor 18K, a resistor 18L, and a transistor 18M. An example of the switch elements 18J is a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0081] As shown in Figures 2, 3, and 4, the motor 6 and the controller 18 are connected by a lead wire 61. Current from the battery pack 25 is supplied to the bus bar of the stator 26 via the controller 18 and the lead wire 61. The drive current supplied to the bus bar is then supplied to the coil 31. The drive current supplied to the coil 31 is switched by the switching operation of the switch element 18J, causing the rotor 27 to rotate. The upper end of the lead wire 61 is connected to the lower end of the bus bar of the stator 26, and the lower end of the lead wire 61 is connected to the upper surface of the controller 18. The lead wire 61 passes inside the grip portion 22. A portion of the lead wire 61 passes behind the switch body 11 inside the grip portion 22.

[0082] The sensor board 37 and the controller 18 are connected by a lead wire 62. A detection signal from the magnetic sensor of the sensor board 37 is transmitted to the controller 18 via the lead wire 62. A microcomputer 18D of the controller 18 controls the switch element 18J based on the detection signal from the magnetic sensor. The upper end of the lead wire 62 is connected to the lower end of the sensor board 37, and the lower end of the lead wire 62 is connected to the upper surface of the controller 18. The lead wire 62 passes inside the grip portion 22. A portion of the lead wire 62 passes behind the switch body 11 inside the grip portion 22.

[0083] The light unit 17 and the controller 18 are connected by a lead wire 63. Current from the battery pack 25 is supplied to the light unit 17 via the controller 18 and the lead wire 63. When current is supplied to the light unit 17, illumination light is emitted from the light unit 17. The upper end of the lead wire 63 is connected to the lower end of the light unit 17, and the lower end of the lead wire 63 is connected to the upper surface of the controller 18. The lead wire 63 passes inside the motor housing 21 and inside the grip portion 22. A portion of the lead wire 63 passes below the hammer case 4 inside the motor housing 21. As shown in FIG. 3, a portion of the lead wire 63 contacts the lower portion of the screw boss into which the screw 2S is inserted. After passing below the cushion member 51 (described later), the lead wire 63 is routed along the same path as the first lead wire 85 and the second lead wire 95. A portion of the lead wire 63 passes behind the switch body 11 inside the grip portion 22.

[0084] The impact tool 1A has a first sensor board 80 that detects the rotation of the anvil 10 and a second sensor board 90 that detects the movement of the hammer 47.

[0085] FIG. 7 is a cross-sectional view showing the upper part of the impact tool 1A according to the embodiment, corresponding to the cross-sectional view taken along line AA in FIG. 3. FIG. 8 is a cross-sectional view showing the upper part of the impact tool 1A according to the embodiment, corresponding to the cross-sectional view taken along line BB in FIG. 3. FIG. 9 is a cross-sectional view showing the upper part of the impact tool 1A according to the embodiment, corresponding to the cross-sectional view taken along line CC in FIG. 3. FIG. 10 is a rear perspective view showing the anvil 10 and the first sensor board 80 according to the embodiment. FIG. 11 is a front perspective view showing the anvil 10 and the first sensor board 80 according to the embodiment. FIG. 12 is a rear perspective view showing the first sensor board 80 according to the embodiment. FIG. 13 is a rear perspective view showing the operation of the anvil 10 according to the embodiment. FIG. 14 is a rear perspective view showing the operation of the anvil 10 according to the embodiment. FIG. 15 is a rear perspective view showing the hammer 47 and the second sensor board 90 according to the embodiment. FIG. 16 is a front perspective view showing the hammer 47 and the second sensor board 90 according to the embodiment. FIG. 17 is a front perspective view showing the second sensor board 90 according to the embodiment. Fig. 18 is a perspective view from behind showing the operation of the hammer 47 according to the embodiment. Fig. 19 is a perspective view from behind showing the operation of the hammer 47 according to the embodiment. Fig. 20 is a perspective view from below showing the hammer case 4 according to the embodiment.

[0086] The anvil 10 has a rod-shaped anvil shaft portion 10A and a pair of anvil protrusions 10B extending radially outward from the rear end of the anvil shaft portion 10A. The anvil protrusions 10B include a first anvil protrusion 10B1 and a second anvil protrusion 10B2. The first sensor substrate 80 detects the rotation of the anvil 10 around the rotation axis AX. The first sensor substrate 80 detects at least one of the position, angular velocity, and angular acceleration of the anvil 10 in the rotational direction around the rotation axis AX.

[0087] The hammer 47 has an annular body portion 47D, a pair of hammer protrusions 47B provided at the front end of the body portion 47D, a hammer groove 47A in which a ball 48 is disposed, and a recess 47C provided at the rear of the body portion 47D. The second sensor board 90 detects movement of the hammer 47 in the axial direction (front-to-back direction). The second sensor board 90 detects at least one of the position, movement speed, and movement acceleration of the hammer 47 in the axial direction.

[0088] The first sensor board 80 and the second sensor board 90 are each disposed inside the hammer case 4. The first sensor board 80 and the second sensor board 90 are each fixed to the hammer case 4. The first sensor board 80 is supported on the rear surface of the annular portion 4C of the hammer case 4. The second sensor board 90 is supported on the lower part of the inner circumferential surface of the rear cylindrical portion 4A of the hammer case 4.

[0089] The first sensor board 80 includes a first circuit board 81 and a plurality of first sensors 82 mounted on the rear surface of the first circuit board 81.

[0090] The first circuit board 81 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which multiple electronic components are mounted. The first circuit board 81 is arranged around at least a portion of the anvil shaft portion 10A. In the embodiment, the first circuit board 81 is annular and arranged around the anvil shaft portion 10A. The first circuit board 81 has a protrusion 81T on its upper portion. The protrusion 81T protrudes upward from the upper portion of the first circuit board 81.

[0091] 7, a recess 4R in which a protrusion 81T is disposed is provided on the inner circumferential surface of the rear cylindrical portion 4A of the hammer case 4. The protrusion 81T fits into the recess 4R, thereby suppressing relative rotation between the hammer case 4 and the first sensor board 80. In other words, the position of the first sensor board 80 in the rotational direction relative to the hammer case 4 is fixed by fitting the protrusion 81T into the recess 4R.

[0092] As shown in FIG. 3 etc., the peripheral edge of the rear surface of the first circuit board 81 is supported by a retaining ring 53. The retaining ring 53 contacts the peripheral edge of the rear surface of the first circuit board 81. The retaining ring 53 fits into a groove provided on the inner peripheral surface of the rear side cylindrical portion 4A. The retaining ring 53 prevents the first sensor board 80 from moving rearward. The front surface of the first circuit board 81 contacts the rear surface of the annular portion 4C. The retaining ring 53 fixes the position of the first sensor board 80 in the front-to-rear direction relative to the hammer case 4.

[0093] As shown in FIG. 3 and other figures, a washer 54 is disposed between the front surface of the anvil protrusion 10B and the outer ring of the anvil bearing 46. The anvil bearing 46 is a ball bearing, and two are disposed in the front-to-rear direction. The front surface of the washer 54 contacts the rear surface of the outer ring of the rear anvil bearing 46. A portion of the front surface of the washer 54 also contacts the rear surface of the annular portion 4C. The rear surface of the washer 54 contacts the front surface of the anvil protrusion 10B. The washer 54 prevents the anvil protrusion 10B from contacting the anvil bearing 46. The washer 54 prevents the anvil bearing 46 from being damaged by the anvil protrusion 10B.

[0094] The first sensor 82 detects the rotation of the anvil 10. The first sensor 82 is mounted on the rear surface of the first circuit board 81. The first sensor 82 is disposed at a position facing the front surface of the anvil protrusion 10B.

[0095] The first sensor 82 includes an induction sensor. Because the anvil 10 is made of metal, the first sensor 82 can detect the rotation of the anvil 10 without contact. The rotation of the anvil 10 can also be interpreted as the position of the anvil 10 in the rotational direction. That is, the first sensor 82 can detect the position of the anvil 10 in the rotational direction without contact. Furthermore, the rotation of the anvil 10 can also be interpreted as the number of rotations of the anvil 10. That is, the first sensor 82 can detect the number of rotations of the anvil 10 without contact.

[0096] A plurality of first sensors 82 are provided in the circumferential direction of the rotation axis AX. In the embodiment, eight first sensors 82 are provided at equal intervals in the circumferential direction on the rear surface of the first circuit board 81. The first sensors 82 include first sensor 82A, first sensor 82B, first sensor 82C, first sensor 82D, first sensor 82E, first sensor 82F, first sensor 82G, and first sensor 82H. In the circumferential direction, if the upper position of the first sensor substrate 81 is the 0[°] position, the right position is the 90[°] position, the lower position is the 180[°] position, and the left position is the 270[°] position, the first sensor 82A is positioned at the 0[°] position, the first sensor 82B is positioned at the 45[°] position, the first sensor 82C is positioned at the 90[°] position, the first sensor 82D is positioned at the 135[°] position, the first sensor 82E is positioned at the 180[°] position, the first sensor 82F is positioned at the 225[°] position, the first sensor 82G is positioned at the 270[°] position, and the first sensor 82H is positioned at the 315[°] position.

[0097] Fig. 10 shows a state in which the first anvil protrusion 10B1 faces the first sensor 82A, and the second anvil protrusion 10B2 faces the first sensor 82E. In the state shown in Fig. 10, the first sensor 82A detects the first anvil protrusion 10B1, and the first sensor 82E detects the second anvil protrusion 10B2.

[0098] Figure 13 shows a state in which the anvil 10 has been rotated 45° from the state shown in Figure 10. That is, Figure 13 shows a state in which the first anvil protrusion 10B1 and the first sensor 82B face each other, and the second anvil protrusion 10B2 and the first sensor 82F face each other. In the state shown in Figure 13, the first sensor 82B detects the first anvil protrusion 10B1, and the first sensor 82F detects the second anvil protrusion 10B2.

[0099] Figure 14 shows a state in which the anvil 10 has rotated 315° from the state shown in Figure 10. That is, Figure 14 shows a state in which the first anvil protrusion 10B1 and the first sensor 82H face each other, and the second anvil protrusion 10B2 and the first sensor 82D face each other. In the state shown in Figure 14, the first sensor 82H detects the first anvil protrusion 10B1, and the first sensor 82D detects the second anvil protrusion 10B2.

[0100] The second sensor board 90 includes a second circuit board 91 and a plurality of second sensors 92 mounted on the upper surface of the second circuit board 91 .

[0101] The second circuit board 91 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The second circuit board 91 is disposed so as to face the lower part of the outer surface of the body part 47D of the hammer 47. In the embodiment, the second circuit board 91 is in the shape of a plate facing the lower surface of the body part 47D.

[0102] As shown in FIG. 8, a pair of grooves 4E into which the side portions of the second circuit board 91 are inserted are provided in the lower part of the rear cylindrical portion 4A of the hammer case 4. The grooves 4E are long in the front-to-rear direction. The left part of the second circuit board 91 fits into the left groove 4E. The right part of the second circuit board 91 fits into the right groove 4E. The groove 4E has a top surface 4Ea that contacts the upper surface of the first circuit board 91 and a bottom surface 4Eb that contacts the lower surface of the first circuit board 91. By fitting the side portions of the second circuit board 91 into the grooves 4E, the position of the second sensor board 90 in the up-down direction relative to the hammer case 4 is fixed.

[0103] As shown in FIG. 9 , the groove 4E has support surfaces 4F that support the second circuit board 91. The support surfaces 4F include side support surfaces 4Fa that support the sides of the second circuit board 91 and front support surfaces 4Fb that support the front surface of the second circuit board 91. The side support surfaces 4Fa are provided on both the left and right sides of the second circuit board 91. The left side support surface 4Fa contacts the left surface of the second circuit board 91. The left side support surface 4Fa contacts the right surface of the second circuit board 91. The front support surface 4Fb contacts the front surface of the second circuit board 91. The rear surface of the second circuit board 91 contacts the lower part of the front surface of the internal gear 43. The side support surfaces 4Fa fix the position of the second sensor board 90 in the left-right direction relative to the hammer case 4. The front support surface 4Fb and the internal gear 43 fix the position of the second sensor board 90 in the front-rear direction relative to the hammer case 4. A first lead wire 85, which will be described later, passes through a space 4G defined between the front surface of the second circuit board 91 and the hammer case 4.

[0104] The second sensor 92 detects the axial movement of the hammer 47. The second sensor 92 is mounted on the upper surface of the second circuit board 91. The second sensor 92 is disposed at a position facing the lower surface of the body portion 47D.

[0105] The second sensor 92 includes an induction sensor. Because the hammer 47 is made of metal, the second sensor 92 can detect the movement of the hammer 47 without contact. The movement of the hammer 47 can also be expressed as the position of the hammer 47 in the front-to-rear direction. That is, the second sensor 92 can detect the position of the hammer 47 in the front-to-rear direction without contact. Furthermore, the movement of the hammer 47 can also be expressed as the movement speed of the hammer 47. That is, the second sensor 92 can detect the movement speed of the hammer 47 without contact.

[0106] A plurality of second sensors 92 are provided in the axial direction. In the embodiment, two second sensors 92 are provided in the axial direction on the upper surface of the second circuit board 91. The second sensors 92 include a second sensor 92A and a second sensor 92B. The second sensor 92A is disposed forward of the second sensor 92B.

[0107] 15 shows a state in which the hammer 47 does not face either the second sensor 92A or the second sensor 92B. In the state shown in FIG.

[0108] Figure 18 shows a state in which the hammer 47 has moved rearward from the state shown in Figure 15. Figure 18 shows a state in which the hammer 47 and the second sensor 92A face each other, but the hammer 47 and the second sensor 92B do not face each other. In the state shown in Figure 18, the second sensor 92A detects the hammer 47, but the second sensor 92B does not detect the hammer 47.

[0109] Figure 19 shows a state in which the anvil 10 has moved rearward from the state shown in Figure 18. Figure 19 shows a state in which the hammer 47 faces each of the second sensors 92A and 92B. In the state shown in Figure 19, each of the second sensors 92A and 92B detects the hammer 47. Note that in the state shown in Figure 19, it is also possible for the second sensor 92B to detect the hammer 47, but for the second sensor 92A not to detect the hammer 47.

[0110] The first circuit board 81 and the controller 18 are connected by a first lead wire 85. The second circuit board 91 and the controller 18 are connected by a second lead wire 95. The detection data of the first sensor 82 is transmitted to the controller 18 via the first lead wire 85. The detection data of the second sensor 92 is transmitted to the controller 18 via the second lead wire 95. Based on the detection data of the first sensor 82 and the detection data of the second sensor 92, the controller 18 controls the tightening torque when the impact tool 1A tightens a fastening part such as a bolt or a nut.

[0111] The first circuit board 81 and the second circuit board 91 are each disposed inside the hammer case 4. The hammer case 4 has a hole 4D through which the first lead wire 85 and the second lead wire 95 each pass. After exiting the hammer case 4 through the hole 4D, the first lead wire 85 and the second lead wire 95 each pass through the inside of the grip portion 22 and are connected to the controller 18. The first lead wire 85 and the second lead wire 95 each pass behind the switch body 11 inside the grip portion 22.

[0112] A cushion member 51 is arranged to cover the edge of the hole 4D. The cushion member 51 is a substantially cylindrical member. The first lead wire 85 and the second lead wire 95 each pass through a passage inside the cushion member 51. A sponge 52 is arranged in the passage of the cushion member 51. The sponge 52 is arranged to fill the gap between the inner circumferential surface of the cushion member 51 and the outer surface of the first lead wire 85. The sponge 52 is arranged to fill the gap between the inner circumferential surface of the cushion member 51 and the outer surface of the second lead wire 95. When grease (lubricant) is arranged inside the hammer case 4, the sponge 52 prevents the grease from leaking from the inside to the outside of the hammer case 4 through the passage of the cushion member 51.

[0113] The upper end of the first lead wire 85 is connected to the lower end of the first sensor board 80, and the lower end of the first lead wire 85 is connected to the upper surface of the controller 18. The first lead wire 85 extending from the lower end of the first sensor board 80 passes below the hammer 47 inside the hammer case 4, passes through the space 4G on the front side of the second sensor board 90 as described with reference to FIG. 9, and reaches below the second sensor board 90. The first lead wire 85 routed rearward below the second sensor board 90 passes through the passage of the cushion member 51 and reaches below the hammer case 4. The first lead wire 85 routed rearward below the hammer case 4 reaches inside the grip portion 22. The first lead wire 85 passes behind the switch body 11 inside the grip portion 22. After passing through the passage of the cushion member 51, the wiring paths of the first lead wire 85 and the lead wire 63 are substantially the same.

[0114] The first lead wire 85 is separated inside the grip portion 22. As shown in Fig. 2, the first lead wire 85 extending from the lower end of the first sensor board 80 and the first lead wire 85 extending from the upper surface of the controller 18 are connected via a connector 85C. When at least one of the first sensor board 80 and the controller 18 needs to be replaced, the replacement can be facilitated by separating the connector 85C.

[0115] The upper end of the second lead wire 95 is connected to the underside of the second sensor board 90, and the lower end of the second lead wire 95 is connected to the upper surface of the controller 18. The second lead wire 95 extending from the underside of the second sensor board 90 passes through a passage in the cushion member 51 and reaches below the hammer case 4. The second lead wire 95 is routed rearward below the hammer case 4 and reaches the inside of the grip portion 22. The second lead wire 95 passes behind the switch body 11 inside the grip portion 22. After passing through the passage in the cushion member 51, the wiring paths of the second lead wire 95, the first lead wire 85, and the lead wire 63 are substantially the same.

[0116] The second lead wire 95 is separated inside the grip portion 22. As shown in Fig. 2, the second lead wire 95 extending from the lower surface of the second sensor board 90 and the second lead wire 95 extending from the upper surface of the controller 18 are connected via a connector 95C. When at least one of the second sensor board 90 and the controller 18 needs to be replaced, the replacement can be facilitated by separating the connector 95C.

[0117] As described above, in the embodiment, in the impact tool 1A which is an impact driver, the first sensor board 80 detects the rotation of the anvil 10, and the second sensor board 90 detects the movement of the hammer 47. The controller 18 can control the tightening torque based on the detection data of the first sensor 82 and the second sensor 92.

[0118] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0119] FIG. 21 is a side view showing an impact tool 1B according to a second embodiment. FIG. 22 is a cross-sectional view showing the impact tool 1B according to the second embodiment. FIG. 23 is a longitudinal cross-sectional view showing the upper part of the impact tool 1B according to the second embodiment. FIG. 24 is a perspective cross-sectional view showing the upper part of the impact tool 1B according to the second embodiment. FIG. 25 is a rear perspective view showing the anvil and first sensor board according to the second embodiment. FIG. 26 is a front perspective view showing the anvil and first sensor board according to the second embodiment. FIG. 27 is a rear perspective view showing the first sensor board according to the second embodiment. FIG. 28 is a rear perspective view showing the hammer and second sensor board according to the second embodiment. FIG. 29 is a front perspective view showing the hammer and second sensor board according to the second embodiment. FIG. 30 is a front perspective view showing the second sensor board according to the second embodiment. FIG. 31 is a bottom perspective view showing the hammer case 4 according to the second embodiment.

[0120] In the embodiment, the impact tool 1B is an impact wrench and includes a housing 102, a hammer case 104, a motor 106, a speed reducer 107, a spindle 108, a striking mechanism 109, an anvil 110, a fan 112, a battery mounting portion 113, a trigger lever 114, a forward / reverse rotation switch lever 115, a first sensor board 180, a second sensor board 190, and a controller 118.

[0121] The housing 102 is made of synthetic resin. In this embodiment, the housing 102 is made of nylon. The housing 102 is made of a pair of left and right half housings.

[0122] The housing 102 has a motor accommodating portion 121 , a grip portion 122 , and a battery holding portion 123 .

[0123] The motor housing portion 121 is cylindrical and houses the motor 106 and the rear part of the hammer case 104.

[0124] The grip portion 122 protrudes downward from the motor housing portion 121. The trigger lever 114 is provided on the upper portion of the grip portion 122. The grip portion 122 is held by an operator.

[0125] The battery holding portion 123 is connected to the lower end of the grip portion 122. The outer dimensions of the battery holding portion 123 are larger than the outer dimensions of the grip portion 122 in both the front-rear direction and the left-right direction.

[0126] The hammer case 104 functions as a gear case that houses the reduction mechanism 107. The hammer case 104 houses the reduction mechanism 107. The hammer case 104 houses the spindle 108. The hammer case 104 houses the striking mechanism 109. The hammer case 104 houses a part of the anvil 110. The hammer case 104 is made of metal. In this embodiment, the hammer case 104 is made of aluminum. The hammer case 104 is cylindrical.

[0127] The hammer case 104 includes a rear-side tubular portion 104A, a front-side tubular portion 104B, and an annular portion 104C. The front-side tubular portion 104B is disposed forward of the rear-side tubular portion 104A. The outer diameter of the rear-side tubular portion 104A is larger than the outer diameter of the front-side tubular portion 104B. The inner diameter of the rear-side tubular portion 104A is larger than the inner diameter of the front-side tubular portion 104B. The annular portion 104C is disposed to connect the front end of the rear-side tubular portion 104A and the rear end of the front-side tubular portion 104B.

[0128] The hammer case 104 is connected to the front part of the motor housing part 121. The motor housing part 121 is fixed to the rear part of the hammer case 104.

[0129] The motor 106 is a power source of the impact tool 1B. The motor 106 generates a rotational force. The motor 106 is an electric motor. The motor 106 is an inner rotor type brushless motor. The motor 106 is accommodated in the motor accommodating portion 121 of the housing 102.

[0130] The reduction gear mechanism 107 transmits the rotational force of the motor 106 to the spindle 108 and the anvil 110. The reduction gear mechanism 107 is housed in the rear cylindrical portion 104A of the hammer case 104. The reduction gear mechanism 107 has a plurality of gears. The reduction gear mechanism 107 is disposed forward of the motor 106.

[0131] The spindle 108 rotates due to the rotational force of the motor 106. The spindle 108 is disposed forward of at least a portion of the motor 106. At least a portion of the spindle 108 is disposed forward of the speed reducer mechanism 107.

[0132] The striking mechanism 109 is driven by a motor 106. The rotational force of the motor 106 is transmitted to the striking mechanism 109 via a reduction mechanism 107 and a spindle 108. The striking mechanism 109 strikes the anvil 110 in the rotational direction based on the rotational force of the spindle 108 rotated by the motor 106. The striking mechanism 109 has a hammer 147, a ball 148, and a coil spring 149. The striking mechanism 109 including the hammer 147 is housed in a hammer case 104.

[0133] The hammer 147 is disposed forward of the reduction mechanism 107. The hammer 147 is housed in the rear cylinder portion 104A. The hammer 147 is disposed around the spindle 108. The hammer 147 is held by the spindle 108. The ball 148 is disposed between the spindle 108 and the hammer 147.

[0134] The hammer 147 has a body portion 147D, a hammer groove 147A, and a hammer protrusion 147B. The body portion 147D is arranged around the spindle 108. The body portion 147D is annular. A recess 147C is provided at the rear portion of the body portion 147D. The recess 147C is provided so as to recess forward from the rear end portion of the body portion 147D. The recess 147C is ring-shaped. The hammer protrusion 147B protrudes forward from the body portion 147D. Two hammer protrusions 147B are provided.

[0135] The hammer 147 is rotated by the motor 106. The rotational force of the motor 106 is transmitted to the hammer 147 via the reduction mechanism 107 and the spindle 108. The hammer 147 can rotate together with the spindle 108 based on the rotational force of the spindle 108, which is rotated by the motor 106. The rotation axis of the hammer 147, the rotation axis of the spindle 108, and the rotation axis AX of the motor 106 coincide with each other. The hammer 147 rotates around the rotation axis AX.

[0136] The ball 148 is made of a metal such as steel. The ball 148 is disposed between the spindle 108 and the hammer 147. The hammer 147 has a hammer groove 147A in which at least a portion of the ball 148 is disposed. The hammer groove 147A is provided in a portion of the inner surface of the body portion 147D.

[0137] The coil spring 149 generates an elastic force that moves the hammer 147 forward. A ring-shaped recess 147C is provided on the rear surface of the hammer 147. The recess 147C is recessed forward from the rear surface of the hammer 147. The front end of the coil spring 149 is disposed inside the recess 147C.

[0138] The anvil 110 is an output part of the impact tool 1B that is actuated by the rotational force of the motor 106. The anvil 110 rotates due to the rotational force of the motor 106. At least a portion of the anvil 110 is disposed forward of the hammer 147.

[0139] The anvil 110 has a rod-shaped anvil shaft portion 110A and an anvil protrusion portion 110B. The anvil protrusion portion 110B is provided at the rear end portion of the anvil 110. The anvil protrusion portion 110B protrudes radially outward from the rear end portion of the anvil shaft portion 110A.

[0140] The hammer protrusion 147B can come into contact with the anvil protrusion 110B. When the motor 106 is driven while the hammer protrusion 147B and the anvil protrusion 110B are in contact with each other, the anvil 110 rotates together with the hammer 147 and the spindle 108.

[0141] The battery mounting section 113 is disposed below the battery holding section 123. The battery pack 125 is mounted in the battery mounting section 113. The battery pack 125 is detachable from the battery mounting section 113.

[0142] The trigger lever 114 is provided on the grip portion 122. The trigger lever 114 is operated by an operator to start the motor 106. The switch body 111 is disposed at the rear of the trigger lever 114. The switch body 111 is disposed inside the grip portion 122. The switch body 111 is operated by operating the trigger lever 114. The operation of the switch body 111 generates a trigger signal. The controller 118 switches between driving and stopping the motor 106 based on the trigger signal.

[0143] The forward / reverse rotation switch lever 115 is provided on the upper part of the grip portion 122. The forward / reverse rotation switch lever 115 is operated by an operator. By operating the forward / reverse rotation switch lever 115, the rotation direction of the motor 106 is switched from one of the forward direction and the reverse direction to the other. By switching the rotation direction of the motor 106, the rotation direction of the spindle 108 is switched.

[0144] The controller 118 includes a computer system. The controller 118 outputs control commands to control at least the motor 106 and the light unit 117. As shown in Fig. 22, the controller 118 is housed in the battery holding section 23 while being held in a controller case 118A. The controller 118 includes a circuit board 118B on which a plurality of electronic components are mounted, and a molded resin 118C that covers the circuit board 118B.

[0145] 22, the controller 118 includes a microcomputer 118D. The microcomputer 118D is disposed on a circuit board 118B.

[0146] The microcomputer 118D includes a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or storage, and a volatile memory H such as a RAM (Random Access Memory).

[0147] The controller 118 includes six switch elements 118J, a capacitor 118K, a resistor 118L, and a transistor 118M. The switch elements 118J are exemplified by metal-oxide-semiconductor field-effect transistors (MOSFETs).

[0148] 22, 23, and 24, the motor 106 and the controller 118 are connected by a lead wire 161. Current from the battery pack 125 is supplied to the bus bar of the motor 106 via the controller 118 and the lead wire 161. An upper end of the lead wire 161 is connected to a lower end of the bus bar of the motor 106, and a lower end of the lead wire 161 is connected to the upper surface of the controller 118. The lead wire 161 passes inside the grip portion 122. A portion of the lead wire 161 passes behind the switch body 111 inside the grip portion 122.

[0149] A sensor board that detects the rotation of the rotor of the motor 106 is connected to the controller 118 by a lead wire 162. A detection signal from the sensor board is transmitted to the controller 118 via the lead wire 162. A microcomputer 118D of the controller 118 controls a switch element 118J based on the detection signal from the magnetic sensor. The upper end of the lead wire 162 is connected to the lower end of the sensor board, and the lower end of the lead wire 162 is connected to the upper surface of the controller 118. The lead wire 162 passes inside the grip portion 122. A portion of the lead wire 162 passes behind the switch body 111 inside the grip portion 122.

[0150] The light unit 117 and the controller 118 are connected by a lead wire 163. Current from the battery pack 125 is supplied to the light unit 117 via the controller 118 and the lead wire 163. When current is supplied to the light unit 117, illumination light is emitted from the light unit 117. An upper end of the lead wire 163 is connected to the light unit 117, and a lower end of the lead wire 163 is connected to the upper surface of the controller 118. The lead wire 163 passes inside the motor accommodating portion 121 and inside the grip portion 122. A portion of the lead wire 163 passes below the hammer case 104 inside the motor accommodating portion 121. After passing below a cushion member 151 (described later), the lead wire 163 is routed along the same path as the first lead wire 185 and the second lead wire 195. A portion of the lead wire 163 passes behind the switch body 111 inside the grip portion 122.

[0151] The impact tool 1B has a first sensor board 180 that detects the rotation of the anvil 110 and a second sensor board 190 that detects the movement of the hammer 147.

[0152] The anvil 110 has a rod-shaped anvil shaft portion 110A and a pair of anvil protrusions 110B extending radially outward from the rear end of the anvil shaft portion 110A. The anvil protrusions 110B include a first anvil protrusion 110B1 and a second anvil protrusion 110B2. The first sensor substrate 180 detects the rotation of the anvil 110 around the rotation axis AX. The first sensor substrate 180 detects at least one of the position, angular velocity, and angular acceleration of the anvil 110 in the rotational direction around the rotation axis AX.

[0153] The hammer 147 has an annular body portion 147D, a pair of hammer protrusions 147B provided at the front end of the body portion 147D, a hammer groove 147A in which a ball 148 is disposed, and a recess 147C provided at the rear of the body portion 147D. The second sensor substrate 190 detects movement of the hammer 147 in the axial direction (front-rear direction). The second sensor substrate 190 detects at least one of the position, movement speed, and movement acceleration of the hammer 147 in the axial direction.

[0154] The first sensor board 180 and the second sensor board 190 are each disposed inside the hammer case 104. The first sensor board 180 and the second sensor board 190 are each fixed to the hammer case 104. The first sensor board 180 is supported on the rear surface of the annular portion 104C of the hammer case 104. The second sensor board 190 is supported on the lower part of the inner circumferential surface of the rear cylindrical portion 104A of the hammer case 104.

[0155] The first sensor board 180 includes a first circuit board 181 and a plurality of first sensors 182 mounted on the rear surface of the first circuit board 181 .

[0156] The first circuit board 181 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The first circuit board 181 is arranged around at least a portion of the periphery of the anvil shaft portion 110A. In the embodiment, the first circuit board 181 is annular and arranged around the periphery of the anvil shaft portion 110A. The first circuit board 181 has a protrusion 181T on its upper portion. The protrusion 181T protrudes upward from the upper portion of the first circuit board 181.

[0157] As in the first embodiment described above, the position of the first sensor board 180 in the rotation direction relative to the hammer case 104 is fixed by arranging the protrusion 181T in a recess provided on the inner circumferential surface of the rear cylindrical portion 104A of the hammer case 104.

[0158] The peripheral edge of the rear surface of first circuit board 181 is supported by a retaining ring 153. The retaining ring 153 contacts the peripheral edge of the rear surface of first circuit board 181. The retaining ring 153 fits into a groove provided on the inner peripheral surface of rear cylinder portion 104A. The retaining ring 153 prevents first sensor board 180 from moving rearward. The front surface of first circuit board 181 contacts the rear surface of annular portion 104C. The retaining ring 153 fixes the position of first sensor board 180 in the front-to-rear direction relative to the hammer case 104.

[0159] A washer 154 is disposed between the front surface of the anvil protrusion 110B and the outer ring of the anvil bearing 146. The anvil bearing 146 is a sliding bearing made of oil-impregnated metal. The front surface of the washer 154 contacts the rear surface of the anvil bearing 146. A portion of the front surface of the washer 154 also contacts the rear surface of the annular portion 104C. The rear surface of the washer 154 contacts the front surface of the anvil protrusion 110B. The washer 154 prevents the anvil protrusion 110B from contacting the anvil bearing 146. The washer 154 prevents the anvil bearing 146 from being damaged by the anvil protrusion 110B.

[0160] The first sensor 182 detects the rotation of the anvil 110. The first sensor 182 is mounted on the rear surface of the first circuit board 181. The first sensor 182 is disposed at a position facing the front surface of the anvil protrusion 110B.

[0161] The first sensor 182 includes an induction sensor. Because the anvil 110 is made of metal, the first sensor 182 can detect the rotation of the anvil 110 without contact. The rotation of the anvil 110 can also be interpreted as the position of the anvil 110 in the rotational direction. That is, the first sensor 182 can detect the position of the anvil 110 in the rotational direction without contact. Furthermore, the rotation of the anvil 110 can also be interpreted as the number of rotations of the anvil 110. That is, the first sensor 182 can detect the number of rotations of the anvil 110 without contact.

[0162] A plurality of first sensors 182 are provided in the circumferential direction of rotation axis AX. In the embodiment, eight first sensors 182 are provided at equal intervals in the circumferential direction on the rear surface of first circuit board 181. First sensors 182 include first sensor 182A, first sensor 182B, first sensor 182C, first sensor 182D, first sensor 182E, first sensor 182F, first sensor 182G, and first sensor 182H. In the circumferential direction, if the position of the top of the first sensor substrate 181 is the 0[°] position, the position of the right part is the 90[°] position, the position of the bottom is the 180[°] position, and the position of the left part is the 270[°] position, then the first sensor 182A is positioned at the 0[°] position, the first sensor 182B is positioned at the 45[°] position, the first sensor 182C is positioned at the 90[°] position, the first sensor 182D is positioned at the 135[°] position, the first sensor 182E is positioned at the 180[°] position, the first sensor 182F is positioned at the 225[°] position, the first sensor 182G is positioned at the 270[°] position, and the first sensor 182H is positioned at the 315[°] position.

[0163] Fig. 25 shows a state in which first anvil protrusion 110B1 and first sensor 182A face each other, and second anvil protrusion 110B2 and first sensor 182E face each other. In the state shown in Fig. 25, first sensor 182A detects first anvil protrusion 110B1, and first sensor 182E detects second anvil protrusion 110B2.

[0164] When the anvil 110 rotates 45° from the state shown in Figure 25 so that the first anvil protrusion 110B1 faces the first sensor 182B and the second anvil protrusion 110B2 faces the first sensor 182F, the first sensor 182B detects the first anvil protrusion 110B1 and the first sensor 182F detects the second anvil protrusion 110B2.

[0165] When the anvil 110 rotates 315° from the state shown in Figure 25 and the first anvil protrusion 110B1 faces the first sensor 182H and the second anvil protrusion 110B2 faces the first sensor 182D, the first sensor 182H detects the first anvil protrusion 110B1 and the first sensor 182D detects the second anvil protrusion 110B2.

[0166] As in the first embodiment described above, a groove in which the second circuit board 91 is disposed is provided in the lower part of the hammer case 104, and the position of the second sensor board 190 is fixed relative to the hammer case 104.

[0167] The second sensor board 190 includes a second circuit board 191 and a plurality of second sensors 192 mounted on the upper surface of the second circuit board 191 .

[0168] The second circuit board 191 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The second circuit board 191 is disposed so as to face the lower part of the outer surface of the body part 147D of the hammer 147. In the embodiment, the second circuit board 191 is in the shape of a plate facing the lower surface of the body part 147D.

[0169] The second sensor 192 detects the axial movement of the hammer 147. The second sensor 192 is mounted on the upper surface of the second circuit board 191. The second sensor 192 is disposed at a position facing the lower surface of the body portion 147D.

[0170] The second sensor 192 includes an induction sensor. Because the hammer 147 is made of metal, the second sensor 192 can detect the movement of the hammer 147 without contact. The movement of the hammer 147 can also be expressed as the position of the hammer 147 in the front-to-rear direction. That is, the second sensor 192 can detect the position of the hammer 147 in the front-to-rear direction without contact. Furthermore, the movement of the hammer 147 can also be expressed as the movement speed of the hammer 147. That is, the second sensor 192 can detect the movement speed of the hammer 147 without contact.

[0171] A plurality of second sensors 192 are provided in the axial direction. In the embodiment, two second sensors 192 are provided in the axial direction on the upper surface of second circuit board 191. Second sensors 192 include second sensor 192A and second sensor 192B. Second sensor 192A is disposed forward of second sensor 192B.

[0172] Fig. 28 shows a state in which the hammer 147 does not face either the second sensor 192A or the second sensor 192B. In the state shown in Fig. 28, neither the second sensor 192A nor the second sensor 192B detects the hammer 147.

[0173] When the hammer 147 moves rearward from the state shown in Figure 28 so that the hammer 147 faces the second sensor 192A and the hammer 147 does not face the second sensor 192B, the second sensor 192A detects the hammer 147 and the second sensor 192B does not detect the hammer 147.

[0174] When the hammer 147 moves further rearward and faces the second sensors 192A and 192B, respectively, the second sensors 192A and 192B detect the hammer 147. Note that it is also possible that the second sensor 192B detects the hammer 147, but the second sensor 192A does not detect the hammer 147.

[0175] The first circuit board 181 and the controller 118 are connected by a first lead wire 185. The second circuit board 191 and the controller 118 are connected by a second lead wire 195. The detection data of the first sensor 182 is transmitted to the controller 118 via the first lead wire 185. The detection data of the second sensor 192 is transmitted to the controller 118 via the second lead wire 195. The controller 118 controls the tightening torque when the impact tool 1B tightens a fastening part such as a bolt or a nut, based on the detection data of the first sensor 182 and the detection data of the second sensor 192.

[0176] The first circuit board 181 and the second circuit board 91 are each disposed inside the hammer case 104. The hammer case 104 has a hole 104D through which the first lead wire 185 and the second lead wire 195 pass. After exiting the hammer case 104 through the hole 104D, the first lead wire 185 and the second lead wire 195 pass through the inside of the grip portion 122 and are connected to the controller 118. The first lead wire 185 and the second lead wire 195 pass behind the switch body 111 inside the grip portion 122.

[0177] A protrusion 110F protruding rearward is provided at the rear end of the anvil 110. A recess 108F into which the protrusion 110F is inserted is provided at the front end of the spindle 108. The first lead wire 185 passes below the protrusion 110F and the recess 108F.

[0178] A cushion member 151 is arranged so as to cover the edge of the hole 104D. The cushion member 151 is a substantially cylindrical member. The first lead wire 185 and the second lead wire 195 each pass through a passage inside the cushion member 151. A sponge 152 is arranged in the passage of the cushion member 151. The sponge 152 is arranged so as to fill the gap between the inner circumferential surface of the cushion member 151 and the outer surface of the first lead wire 185. The sponge 152 is arranged so as to fill the gap between the inner circumferential surface of the cushion member 151 and the outer surface of the second lead wire 195. When grease (lubricant) is arranged inside the hammer case 104, the sponge 152 prevents the grease from leaking from the inside to the outside of the hammer case 104 through the passage of the cushion member 151.

[0179] The upper end of the first lead wire 185 is connected to the lower end of the first sensor board 180, and the lower end of the first lead wire 185 is connected to the upper surface of the controller 118. The first lead wire 185 extending from the lower end of the first sensor board 180 passes below the hammer 147 inside the hammer case 104 and reaches below the second sensor board 190. The first lead wire 185 routed rearward below the second sensor board 190 passes through a passage in the cushion member 151 and reaches below the hammer case 104. The first lead wire 185 routed rearward below the hammer case 104 reaches inside the grip portion 122. The first lead wire 185 passes behind the switch body 111 inside the grip portion 122. After passing through the passage in the cushion member 151, the wiring paths of the first lead wire 185 and the lead wire 163 are substantially the same.

[0180] First lead wire 185 is separated inside grip portion 122. As shown in Fig. 22, first lead wire 185 extending from the lower end of first sensor board 180 and first lead wire 185 extending from the upper surface of controller 118 are connected via connector 185C. When at least one of first sensor board 180 and controller 118 needs to be replaced, the replacement can be facilitated by separating connector 185C.

[0181] The upper end of the second lead wire 195 is connected to the lower surface of the second sensor board 190, and the lower end of the second lead wire 195 is connected to the upper surface of the controller 118. The second lead wire 195 extending from the lower surface of the second sensor board 190 passes through a passage in the cushion member 151 and reaches below the hammer case 104. The second lead wire 195 is routed rearward below the hammer case 104 and reaches the inside of the grip portion 122. The second lead wire 195 passes behind the switch body 111 inside the grip portion 122. After passing through the passage in the cushion member 151, the wiring paths of the second lead wire 195, the first lead wire 185, and the lead wire 163 are substantially the same.

[0182] Second lead wire 195 is separated inside grip portion 122. As shown in Fig. 22, second lead wire 195 extending from the lower surface of second sensor board 190 and second lead wire 195 extending from the upper surface of controller 118 are connected via connector 195C. When at least one of second sensor board 190 and controller 118 needs to be replaced, the replacement can be facilitated by separating connector 195C.

[0183] As described above, in the embodiment, in the impact tool 1B which is an impact wrench, the first sensor board 180 detects the rotation of the anvil 110, and the second sensor board 190 detects the movement of the hammer 147. The controller 118 can control the tightening torque based on the detection data of the first sensor 182 and the second sensor 192.

[0184] [Third embodiment] A third embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0185] FIG. 32 is a side view showing an impact tool 1C according to a third embodiment. FIG. 33 is a cross-sectional view showing the impact tool 1C according to the third embodiment. FIG. 34 is a longitudinal cross-sectional view showing the upper part of the impact tool 1C according to the third embodiment. FIG. 35 is a perspective cross-sectional view showing the upper part of the impact tool 1C according to the third embodiment. FIG. 36 is a rear perspective view showing the anvil and first sensor board according to the third embodiment. FIG. 37 is a front perspective view showing the anvil and first sensor board according to the third embodiment. FIG. 38 is a rear perspective view showing the first sensor board according to the third embodiment. FIG. 39 is a rear perspective view showing the hammer and second sensor board according to the third embodiment. FIG. 40 is a front perspective view showing the hammer and second sensor board according to the third embodiment. FIG. 41 is a front perspective view showing the second sensor board according to the third embodiment. FIG. 42 is a bottom perspective view showing the hammer case 4 according to the third embodiment.

[0186] In this embodiment, the impact tool 1C is an impact wrench and includes a housing 202, a hammer case 204, a spindle 208, a striking mechanism 209, an anvil 210, a battery mounting portion 213, a trigger lever 214, a forward / reverse rotation switching lever 215, a first sensor board 280, a second sensor board 290, and a controller 218.

[0187] The housing 202 has a motor accommodating portion 221 , a rear grip portion 222 , a battery holding portion 223 , and a front grip portion 224 .

[0188] The motor housing 221 is cylindrical. The rear grip 222 extends downward from the motor housing 221. The trigger lever 214 is provided on the upper part of the rear grip 222. The grip 122 is held by an operator. The front grip 224 is disposed forward of the rear grip 222. The battery holding portion 223 is connected to the lower end of the rear grip 222 and the lower end of the front grip 224.

[0189] The hammer case 204 includes a rear-side tubular portion 204A, a front-side tubular portion 204B, and an annular portion 204C. The front-side tubular portion 204B is disposed forward of the rear-side tubular portion 204A. The outer diameter of the rear-side tubular portion 204A is larger than the outer diameter of the front-side tubular portion 204B. The inner diameter of the rear-side tubular portion 204A is larger than the inner diameter of the front-side tubular portion 204B. The annular portion 204C is disposed to connect the front end of the rear-side tubular portion 204A and the rear end of the front-side tubular portion 204B.

[0190] The hammer case 204 is connected to the front part of the motor housing part 221. The motor housing part 221 is fixed to the rear part of the hammer case 204.

[0191] The spindle 208 is rotated by the torque of a motor (not shown).

[0192] The striking mechanism 209 has a hammer 247, a ball 248, and a coil spring 249. The striking mechanism 209 including the hammer 247 is housed in a hammer case 204.

[0193] The hammer 247 has a body portion 247D, a hammer groove 247A, and a hammer protrusion 247B. The body portion 247D is arranged around the spindle 208. The body portion 247D is annular. A recess 247C is provided at the rear portion of the body portion 247D. The recess 247C is provided so as to be recessed forward from the rear end portion of the body portion 247D. The recess 247C is ring-shaped. The hammer protrusion 247B protrudes forward from the body portion 247D. Two hammer protrusions 247B are provided.

[0194] The anvil 210 has a rod-shaped anvil shaft portion 210A and an anvil protrusion portion 210B. The anvil protrusion portion 210B is provided at the rear end portion of the anvil 210. The anvil protrusion portion 210B protrudes radially outward from the rear end portion of the anvil shaft portion 210A.

[0195] The battery mounting section 213 is disposed below the battery holding section 223. The battery pack 225 is mounted in the battery mounting section 213. The battery pack 225 is detachable from the battery mounting section 213.

[0196] The trigger lever 214 is provided on the rear grip portion 222. The switch body 211 is disposed at the rear of the trigger lever 214. The switch body 211 is disposed inside the grip portion 122. When the trigger lever 214 is operated, the switch body 211 is operated. When the switch body 211 is operated, a trigger signal is generated.

[0197] The forward / reverse rotation switch lever 215 is provided on the upper part of the rear grip portion 222. The forward / reverse rotation switch lever 215 is operated by the operator.

[0198] The impact tool 1C has a first sensor board 280 that detects the rotation of the anvil 210 and a second sensor board 290 that detects the movement of the hammer 247.

[0199] The anvil 210 has a rod-shaped anvil shaft portion 210A and a pair of anvil protrusions 210B extending radially outward from the rear end of the anvil shaft portion 210A. The first sensor substrate 280 detects rotation of the anvil 210 about the rotation axis AX. The first sensor substrate 280 detects at least one of the position, angular velocity, and angular acceleration of the anvil 210 in the rotational direction about the rotation axis AX.

[0200] The hammer 247 has an annular body portion 247D, a pair of hammer protrusions 247B provided at the front end of the body portion 247D, a hammer groove 247A in which the ball 248 is disposed, and a recess 247C provided at the rear of the body portion 247D. The second sensor substrate 290 detects movement of the hammer 247 in the axial direction (front-rear direction). The second sensor substrate 290 detects at least one of the position, movement speed, and movement acceleration of the hammer 247 in the axial direction.

[0201] The motor and the controller 218 are connected by a lead wire 261. Current from the battery pack 225 is supplied to the motor via the controller 218 and the lead wire 261. The upper end of the lead wire 261 is connected to the lower end of the motor, and the lower end of the lead wire 261 is connected to the upper surface of the controller 218. The lead wire 261 passes inside the rear grip portion 222. A portion of the lead wire 261 passes behind the switch body 211 inside the rear grip portion 222.

[0202] The sensor board, which detects the rotation of the motor rotor, is connected to the controller 218 by a lead wire 262. A detection signal from the sensor board is transmitted to the controller 218 via the lead wire 262. The controller 218 controls the motor based on the detection signal from the magnetic sensor. The upper end of the lead wire 262 is connected to the lower end of the sensor board, and the lower end of the lead wire 262 is connected to the upper surface of the controller 218. The lead wire 262 passes inside the rear grip portion 222. A portion of the lead wire 262 passes behind the switch body 211 inside the rear grip portion 222.

[0203] The light unit 217 and the controller 218 are connected by a lead wire 263. Current from the battery pack 225 is supplied to the light unit 217 via the controller 218 and the lead wire 263. When current is supplied to the light unit 217, illumination light is emitted from the light unit 217. An upper end of the lead wire 263 is connected to a lower end of the light unit 217, and a lower end of the lead wire 263 is connected to an upper surface of the controller 218. The lead wire 263 passes inside the rear grip portion 222. A portion of the lead wire 263 passes below the hammer case 204. After passing below a cushion member 251 (described later), the lead wire 263 is routed along the same path as the first lead wire 285 and the second lead wire 295. A portion of the lead wire 263 passes behind the switch body 211 inside the rear grip portion 222.

[0204] The first sensor board 280 and the second sensor board 290 are each disposed inside the hammer case 204. The first sensor board 280 and the second sensor board 290 are each fixed to the hammer case 204. The first sensor board 280 is supported on the rear surface of the annular portion 204C of the hammer case 204. The second sensor board 290 is supported on the lower part of the inner circumferential surface of the rear cylindrical portion 204A of the hammer case 204.

[0205] The anvil 210 has a rod-shaped anvil shaft portion 210A and a pair of anvil protrusions 210B extending radially outward from the rear end of the anvil shaft portion 210A. The anvil protrusions 210B include a first anvil protrusion 210B1 and a second anvil protrusion 210B2. The first sensor substrate 280 detects the rotation of the anvil 210 about the rotation axis AX. The first sensor substrate 280 detects at least one of the position, angular velocity, and angular acceleration of the anvil 210 in the rotational direction about the rotation axis AX.

[0206] The first sensor board 280 includes a first circuit board 281 and a plurality of first sensors 282 mounted on the rear surface of the first circuit board 281 .

[0207] The first circuit board 281 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which multiple electronic components are mounted. The first circuit board 281 is arranged around at least a portion of the anvil shaft portion 210A. In the embodiment, the first circuit board 281 is annular and arranged around the anvil shaft portion 210A. The first circuit board 281 has a protrusion 281T on its upper portion. The protrusion 281T protrudes upward from the upper portion of the first circuit board 281.

[0208] As in the first embodiment described above, the position of the first sensor board 280 in the rotation direction relative to the hammer case 204 is fixed by arranging the protrusion 281T in a recess provided on the inner circumferential surface of the hammer case 204.

[0209] The peripheral edge of the rear surface of the first circuit board 281 is supported by a retaining ring 253. The retaining ring 253 contacts the peripheral edge of the rear surface of the first circuit board 281. The retaining ring 253 fits into a groove provided on the inner peripheral surface of the rear cylinder portion 204A. The retaining ring 253 prevents the first sensor board 280 from moving rearward. The front surface of the first circuit board 281 contacts the rear surface of the annular portion 204C. The retaining ring 253 fixes the position of the first sensor board 280 in the front-to-rear direction relative to the hammer case 204.

[0210] A washer 254 is disposed between the front surface of the anvil protrusion 210B and the outer ring of the anvil bearing 246. The anvil bearing 246 is a sliding bearing made of oil-impregnated metal. The front surface of the washer 254 contacts the rear surface of the anvil bearing 246. A portion of the front surface of the washer 254 also contacts the rear surface of the anvil portion 204C. The rear surface of the washer 254 contacts the front surface of the anvil protrusion 210B. The washer 254 prevents the anvil protrusion 210B from contacting the anvil bearing 246. The washer 254 prevents the anvil bearing 246 from being damaged by the anvil protrusion 210B.

[0211] The first sensor 282 detects the rotation of the anvil 210. The first sensor 282 is mounted on the rear surface of the first circuit board 281. The first sensor 282 is disposed at a position facing the front surface of the anvil protrusion 210B.

[0212] The first sensor 282 includes an induction sensor. Because the anvil 210 is made of metal, the first sensor 282 can detect the rotation of the anvil 210 without contact. The rotation of the anvil 210 can also be interpreted as the position of the anvil 210 in the rotational direction. That is, the first sensor 282 can detect the position of the anvil 210 in the rotational direction without contact. Furthermore, the rotation of the anvil 210 can also be interpreted as the number of rotations of the anvil 210. That is, the first sensor 282 can detect the number of rotations of the anvil 210 without contact.

[0213] A plurality of first sensors 282 are provided in the circumferential direction of rotation axis AX. In the embodiment, eight first sensors 282 are provided at equal intervals in the circumferential direction on the rear surface of first circuit board 281. First sensors 282 include first sensor 282A, first sensor 282B, first sensor 282C, first sensor 282D, first sensor 282E, first sensor 282F, first sensor 282G, and first sensor 282H. In the circumferential direction, if the position of the top of first sensor substrate 281 is the 0[°] position, the position of the right part is the 90[°] position, the position of the bottom is the 180[°] position, and the position of the left part is the 270[°] position, first sensor 282A is positioned at the 0[°] position, first sensor 282B is positioned at the 45[°] position, first sensor 282C is positioned at the 90[°] position, first sensor 282D is positioned at the 135[°] position, first sensor 282E is positioned at the 180[°] position, first sensor 282F is positioned at the 225[°] position, first sensor 282G is positioned at the 270[°] position, and first sensor 282H is positioned at the 315[°] position.

[0214] When the anvil 210 rotates 45° from the state shown in Figure 36 so that the first anvil protrusion 210B1 faces the first sensor 282B and the second anvil protrusion 210B2 faces the first sensor 282F, the first sensor 282B detects the first anvil protrusion 210B1 and the first sensor 282F detects the second anvil protrusion 210B2.

[0215] When the anvil 210 rotates 315° from the state shown in Figure 36 and the first anvil protrusion 210B1 faces the first sensor 282H and the second anvil protrusion 210B2 faces the first sensor 282D, the first sensor 282H detects the first anvil protrusion 210B1 and the first sensor 282D detects the second anvil protrusion 210B2.

[0216] As in the first embodiment described above, a groove in which the second circuit board 91 is disposed is provided in the lower part of the hammer case 204, and the position of the second sensor board 290 is fixed relative to the hammer case 204.

[0217] The second sensor board 290 includes a second circuit board 291 and a plurality of second sensors 292 mounted on the upper surface of the second circuit board 291 .

[0218] The second circuit board 291 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The second circuit board 291 is disposed so as to face the lower part of the outer surface of the body part 247D of the hammer 247. In the embodiment, the second circuit board 291 is in the shape of a plate facing the lower surface of the body part 247D.

[0219] The second sensor 292 detects the axial movement of the hammer 247. The second sensor 292 is mounted on the upper surface of the second circuit board 291. The second sensor 292 is disposed at a position facing the lower surface of the body portion 247D.

[0220] The second sensor 292 includes an induction sensor. Because the hammer 247 is made of metal, the second sensor 292 can detect the movement of the hammer 247 without contact. The movement of the hammer 247 can also be expressed as the position of the hammer 247 in the front-rear direction. That is, the second sensor 292 can detect the position of the hammer 247 in the front-rear direction without contact. Furthermore, the movement of the hammer 247 can also be expressed as the movement speed of the hammer 247. That is, the second sensor 292 can detect the movement speed of the hammer 247 without contact.

[0221] A plurality of second sensors 292 are provided in the axial direction. In the embodiment, two second sensors 292 are provided in the axial direction on the upper surface of second circuit board 291. Second sensors 292 include second sensor 292A and second sensor 292B. Second sensor 292A is disposed forward of second sensor 292B.

[0222] Fig. 39 shows a state in which the hammer 247 does not face either the second sensor 292A or the second sensor 292B. In the state shown in Fig. 39, neither the second sensor 292A nor the second sensor 292B detects the hammer 247.

[0223] When the hammer 247 moves rearward from the state shown in Figure 39 so that the hammer 247 faces the second sensor 292A but does not face the second sensor 292B, the second sensor 292A detects the hammer 247 but the second sensor 292B does not detect the hammer 247.

[0224] When the hammer 247 moves further rearward and faces the second sensors 292A and 292B, respectively, the second sensors 292A and 292B detect the hammer 247. Note that it is also possible that the second sensor 292B detects the hammer 247, but the second sensor 292A does not detect the hammer 247.

[0225] The first circuit board 281 and the controller 218 are connected by a first lead wire 285. The second circuit board 291 and the controller 218 are connected by a second lead wire 295. The detection data of the first sensor 282 is transmitted to the controller 218 via the first lead wire 285. The detection data of the second sensor 292 is transmitted to the controller 218 via the second lead wire 295. The controller 218 controls the tightening torque when the impact tool 1C tightens a fastening part such as a bolt or a nut, based on the detection data of the first sensor 282 and the detection data of the second sensor 292.

[0226] The first circuit board 281 and the second circuit board 91 are each disposed inside the hammer case 204. The hammer case 204 has a hole 204D through which the first lead wire 285 and the second lead wire 295 pass. After exiting the hammer case 204 through the hole 204D, the first lead wire 285 and the second lead wire 295 pass through the inside of the rear grip portion 222 and are connected to the controller 218. The first lead wire 285 and the second lead wire 295 pass behind the switch body 211 inside the rear grip portion 222.

[0227] A cushion member 251 is arranged so as to cover the edge of hole 204D. Cushion member 251 is a substantially cylindrical member. First lead wire 285 and second lead wire 295 each pass through a passage inside cushion member 251. A sponge 252 is arranged in the passage of cushion member 251. Sponge 252 is arranged so as to fill the gap between the inner circumferential surface of cushion member 251 and the outer surface of first lead wire 285. Sponge 252 is arranged so as to fill the gap between the inner circumferential surface of cushion member 251 and the outer surface of second lead wire 295. When grease (lubricant) is arranged inside hammer case 204, sponge 252 prevents the grease from leaking from the inside to the outside of hammer case 204 through the passage of cushion member 251.

[0228] The upper end of the first lead wire 285 is connected to the lower end of the first sensor board 280, and the lower end of the first lead wire 285 is connected to the upper surface of the controller 218. The first lead wire 285 extending from the lower end of the first sensor board 280 passes below the hammer 247 inside the hammer case 204 and reaches below the second sensor board 290. The first lead wire 285 routed rearward below the second sensor board 290 passes through a passage in the cushion member 251 and reaches below the hammer case 204. The first lead wire 285 routed rearward below the hammer case 204 reaches the inside of the rear grip portion 222. The first lead wire 285 passes behind the switch body 211 inside the rear grip portion 222. After passing through the passage in the cushion member 251, the wiring paths of the first lead wire 285 and the lead wire 263 are substantially the same.

[0229] The upper end of the second lead wire 295 is connected to the lower surface of the second sensor board 290, and the lower end of the second lead wire 295 is connected to the upper surface of the controller 218. The second lead wire 295 extending from the lower surface of the second sensor board 290 passes through a passage in the cushion member 251 and reaches below the hammer case 204. The second lead wire 295 is routed rearward below the hammer case 204 and reaches the inside of the rear grip portion 222. The second lead wire 295 passes behind the switch body 211 inside the rear grip portion 222. After passing through the passage in the cushion member 251, the wiring paths of the second lead wire 295, the first lead wire 285, and the lead wire 263 are substantially the same.

[0230] As described above, in the embodiment, in the impact tool 1C which is an impact wrench, the first sensor board 280 detects the rotation of the anvil 210, and the second sensor board 290 detects the movement of the hammer 247. The controller 218 can control the tightening torque based on the detection data of the first sensor 282 and the second sensor 292.

[0231] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0232] FIG. 43 is a side view showing an impact tool according to a fourth embodiment. FIG. 44 is a cross-sectional view showing an impact tool according to the fourth embodiment. FIG. 45 is a longitudinal cross-sectional view showing a front part of the impact tool according to the fourth embodiment. FIG. 46 is a perspective cross-sectional view showing a front part of the impact tool according to the fourth embodiment. FIG. 47 is a rear perspective view showing an anvil and a first sensor board according to the fourth embodiment. FIG. 48 is a front perspective view showing an anvil and a first sensor board according to the fourth embodiment. FIG. 49 is a rear perspective view showing a first sensor board according to the fourth embodiment. FIG. 50 is a rear perspective view showing a hammer and a second sensor board according to the fourth embodiment. FIG. 51 is a front perspective view showing a hammer and a second sensor board according to the fourth embodiment. FIG. 52 is a front perspective view showing a second sensor board according to the fourth embodiment. FIG. 53 is a bottom perspective view showing a hammer case 4 according to the third embodiment.

[0233] In this embodiment, the impact tool 1D is an angle impact wrench and includes a housing 302, a hammer case 304, a spindle 308, a striking mechanism 309, an anvil 310, a battery mounting portion 313, a trigger lever 314, a forward / reverse rotation switching lever 315, a first sensor board 380, a second sensor board 390, and a controller 318.

[0234] The housing 302 has a motor accommodating portion 321 , a grip portion 322 , and a battery holding portion 323 .

[0235] The motor housing 321 is cylindrical. The grip portion 322 extends rearward from the motor housing 321. The grip portion 322 extends in the front-to-rear direction. The motor housing 321 is connected to the grip portion 322. The trigger lever 314 is provided at the bottom of the grip portion 322. The grip portion 322 is held by an operator. The battery holding portion 323 is connected to the rear end portion of the grip portion 322.

[0236] The hammer case 304 includes an upper cylindrical portion 304A, a lower cylindrical portion 304B, and an annular portion 304C. The lower cylindrical portion 304B is positioned lower than the upper cylindrical portion 304A. The outer diameter of the upper cylindrical portion 304A is larger than the outer diameter of the lower cylindrical portion 304B. The inner diameter of the upper cylindrical portion 304A is larger than the inner diameter of the lower cylindrical portion 304B. The annular portion 304C is positioned to connect the lower end of the upper cylindrical portion 304A and the upper end of the lower cylindrical portion 304B.

[0237] The hammer case 304 is connected to the front part of the motor housing part 321. The motor housing part 321 is fixed to the rear part of the hammer case 304.

[0238] The spindle 308 is rotated by the torque of a motor (not shown). The rotation axis AX of the motor extends in the front-rear direction.

[0239] The striking mechanism 309 has a hammer 347, a ball 348, and a coil spring 349. The striking mechanism 309 including the hammer 347 is housed in a hammer case 304.

[0240] The hammer 347 has a body portion 347D, a hammer groove 347A, and a hammer protrusion 347B. The body portion 347D is arranged around the spindle 308. The body portion 347D is annular. A recess 347C is provided in the upper part of the body portion 347D. The recess 347C is provided so as to be recessed downward from the upper end of the body portion 347D. The recess 347C is ring-shaped. The hammer protrusion 347B protrudes downward from the body portion 347D. Two hammer protrusions 347B are provided.

[0241] The anvil 310 has a rod-shaped anvil shaft portion 310A and an anvil protrusion portion 310B. The anvil protrusion portion 310B is provided at the upper end portion of the anvil 310. The anvil protrusion portion 310B protrudes radially outward from the upper end portion of the anvil shaft portion 310A. The anvil 310 is struck in the rotational direction by a hammer 347.

[0242] The anvil 310 extends in the vertical direction. The rotation axis CX of the anvil 310 extends in the vertical direction. The rotation axis AX of the motor (not shown) and the rotation axis CX of the anvil 310 are perpendicular to each other.

[0243] The battery mounting section 313 is disposed below the battery holding section 323. The battery pack 325 is mounted in the battery mounting section 313. The battery pack 325 is detachable from the battery mounting section 313.

[0244] The impact tool 1D has a first sensor board 380 that detects the rotation of the anvil 310 and a second sensor board 390 that detects the movement of the hammer 347.

[0245] The anvil 310 has a rod-shaped anvil shaft portion 310A and a pair of anvil protrusions 310B extending radially outward from the upper end of the anvil shaft portion 310A. The first sensor substrate 380 detects rotation of the anvil 310 about the rotation axis CX. The first sensor substrate 380 detects at least one of the position, angular velocity, and angular acceleration of the anvil 310 in the rotational direction about the rotation axis CX.

[0246] The hammer 347 has an annular body portion 347D, a pair of hammer protrusions 347B provided at the lower end of the body portion 347D, a hammer groove 347A in which a ball 348 is disposed, and a recess 347C provided at the rear of the body portion 347D. The second sensor substrate 390 detects movement of the hammer 347 in the axial direction (up and down direction). The second sensor substrate 390 detects at least one of the position, movement speed, and movement acceleration of the hammer 347 in the axial direction.

[0247] The first sensor board 380 and the second sensor board 390 are each disposed inside the hammer case 304. The first sensor board 380 and the second sensor board 390 are each fixed to the hammer case 304. The first sensor board 380 is supported on the upper surface of the annular portion 304C of the hammer case 304. The second sensor board 390 is supported on the rear portion of the upper cylindrical portion 304A of the hammer case 304.

[0248] The light unit 317 and the controller 318 are connected by a lead wire 363. Current from the battery pack 325 is supplied to the light unit 317 via the controller 318 and the lead wire 363. When current is supplied to the light unit 317, illumination light is emitted from the light unit 317. A front end of the lead wire 363 is connected to the light unit 317, and a rear end of the lead wire 363 is connected to the top surface of the controller 318. The lead wire 363 passes inside the grip portion 322. A portion of the lead wire 363 passes below the hammer case 304. The lead wire 363 passes below a cushion member 351, which will be described later, and then is routed along the same path as the first lead wire 385 and the second lead wire 395.

[0249] The anvil 310 has a rod-shaped anvil shaft portion 310A and a pair of anvil protrusions 310B extending radially outward from the upper end of the anvil shaft portion 310A. The anvil protrusions 310B include a first anvil protrusion 310B1 and a second anvil protrusion 310B2. The first sensor substrate 380 detects rotation of the anvil 310 around the rotation axis CX. The first sensor substrate 380 detects at least one of the position, angular velocity, and angular acceleration of the anvil 310 in the rotational direction around the rotation axis CX.

[0250] The first sensor board 380 includes a first circuit board 381 and a plurality of first sensors 382 mounted on the rear surface of the first circuit board 381 .

[0251] The first circuit board 381 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which multiple electronic components are mounted. The first circuit board 381 is disposed around at least a portion of the anvil shaft portion 310A. In the embodiment, the first circuit board 381 is annular and disposed around the anvil shaft portion 310A. The first sensor board 380 is disposed in a recess 304E provided on the upper surface of the annular portion 304C. The first circuit board 381 has a protrusion 381T at its front portion. The protrusion 381T protrudes forward from the front portion of the first circuit board 381. The protrusion 381T fixes the position of the first sensor board 380 in the rotational direction relative to the hammer case 304.

[0252] The peripheral edge of the upper surface of first circuit board 381 is supported by retaining ring 353. Retaining ring 353 contacts the peripheral edge of the upper surface of first circuit board 381. Retaining ring 353 fits into a groove provided on the inner peripheral surface of hammer case 304. Retaining ring 353 prevents first sensor board 380 from moving upward. The lower surface of first circuit board 381 contacts the upper surface of annular portion 304C. Retaining ring 353 fixes the position of first sensor board 380 in the up-down direction relative to hammer case 304.

[0253] The anvil bearing 346 is a sliding bearing made of oil-impregnated metal. The upper end of the anvil bearing 346 is positioned higher than the first circuit board 381. Because the upper end of the anvil bearing 346 is positioned higher than the upper surface of the first circuit board 381, contact between the anvil protrusion 310B and the first circuit board 381 is suppressed.

[0254] First sensor 382 detects the rotation of anvil 310. First sensor 382 is mounted on the upper surface of first circuit board 381. First sensor 382 is disposed at a position facing the lower surface of anvil protrusion 310B.

[0255] The first sensor 382 includes an induction sensor. Because the anvil 310 is made of metal, the first sensor 382 can detect the rotation of the anvil 310 without contact. The rotation of the anvil 310 can also be interpreted as the position of the anvil 310 in the rotational direction. That is, the first sensor 382 can detect the position of the anvil 310 in the rotational direction without contact. Furthermore, the rotation of the anvil 310 can also be interpreted as the number of rotations of the anvil 310. That is, the first sensor 382 can detect the number of rotations of the anvil 310 without contact.

[0256] A plurality of first sensors 382 are provided in the circumferential direction of rotation axis CX. In the embodiment, eight first sensors 382 are provided at equal intervals in the circumferential direction on the upper surface of first circuit board 381. First sensors 382 include first sensor 382A, first sensor 382B, first sensor 382C, first sensor 382D, first sensor 382E, first sensor 382F, first sensor 382G, and first sensor 382H. In the circumferential direction, if the front position of the first sensor substrate 381 is the 0[°] position, the right position is the 90[°] position, the rear position is the 180[°] position, and the left position is the 270[°] position, first sensor 382A is positioned at the 0[°] position, first sensor 382B is positioned at the 45[°] position, first sensor 382C is positioned at the 90[°] position, first sensor 382D is positioned at the 135[°] position, first sensor 382E is positioned at the 180[°] position, first sensor 382F is positioned at the 225[°] position, first sensor 382G is positioned at the 270[°] position, and first sensor 382H is positioned at the 315[°] position.

[0257] Figure 47 shows a state in which first anvil protrusion 310B1 and first sensor 382A face each other, and second anvil protrusion 310B2 and first sensor 382E face each other. In the state shown in Figure 47, first sensor 382A detects first anvil protrusion 310B1, and first sensor 382E detects second anvil protrusion 310B2.

[0258] When the anvil 310 rotates 45° from the state shown in Figure 47 so that the first anvil protrusion 310B1 faces the first sensor 382B and the second anvil protrusion 310B2 faces the first sensor 382F, the first sensor 382B detects the first anvil protrusion 310B1 and the first sensor 382F detects the second anvil protrusion 310B2.

[0259] When the anvil 310 rotates 315° from the state shown in Figure 47 so that the first anvil protrusion 310B1 faces the first sensor 382H and the second anvil protrusion 310B2 faces the first sensor 382D, the first sensor 382H detects the first anvil protrusion 310B1 and the first sensor 382D detects the second anvil protrusion 310B2.

[0260] The second sensor board 390 includes a second circuit board 391 and a plurality of second sensors 392 mounted on the upper surface of the second circuit board 391 .

[0261] The second circuit board 391 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The second circuit board 391 is disposed so as to face the rear part of the outer surface of the body part 347D of the hammer 347. In the embodiment, the second circuit board 391 is in the shape of a plate facing the rear surface of the body part 347D.

[0262] The second sensor 392 detects the axial movement of the hammer 347. The second sensor 392 is mounted on the front surface of the second circuit board 391. The second sensor 392 is disposed at a position facing the rear surface of the body portion 347D.

[0263] The second sensor 392 includes an induction sensor. Because the hammer 347 is made of metal, the second sensor 392 can detect the movement of the hammer 347 without contact. The movement of the hammer 347 can also be expressed as the position of the hammer 347 in the up-down direction. That is, the second sensor 392 can detect the position of the hammer 347 in the up-down direction without contact. Furthermore, the movement of the hammer 347 can also be expressed as the movement speed of the hammer 347. That is, the second sensor 392 can detect the movement speed of the hammer 347 without contact.

[0264] A plurality of second sensors 392 are provided in the axial direction. In the embodiment, two second sensors 392 are provided in the axial direction on the front surface of second circuit board 391. Second sensors 392 include second sensor 392A and second sensor 392B. Second sensor 392A is disposed below second sensor 392B.

[0265] In a state where the hammer 347 does not face either the second sensor 392A or the second sensor 392B, neither the second sensor 392A nor the second sensor 392B detects the hammer 347.

[0266] In a state where the hammer 347 and the second sensor 392A face each other and the hammer 347 and the second sensor 392B do not face each other, the second sensor 392A detects the hammer 347, but the second sensor 392B does not detect the hammer 347.

[0267] In a state in which the hammer 347 faces the second sensor 392A and the second sensor 392B, respectively, the second sensor 392A and the second sensor 392B each detect the hammer 347. Note that it is also possible that the second sensor 392B detects the hammer 347, but the second sensor 392A does not detect the hammer 347.

[0268] The first circuit board 381 and the controller 318 are connected by a first lead wire 385. The second circuit board 391 and the controller 318 are connected by a second lead wire 395. The detection data of the first sensor 382 is transmitted to the controller 318 via the first lead wire 385. The detection data of the second sensor 392 is transmitted to the controller 318 via the second lead wire 395. The controller 318 controls the tightening torque when the impact tool 1D tightens a fastening part such as a bolt or a nut, based on the detection data of the first sensor 382 and the detection data of the second sensor 392.

[0269] The first circuit board 381 and the second circuit board 91 are each disposed inside the hammer case 304. The hammer case 304 has a hole 304D through which the first lead wire 385 and the second lead wire 395 pass. The first lead wire 385 and the second lead wire 395 exit the hammer case 304 through the hole 304D, and then pass through the inside of the grip portion 322 to be connected to the controller 318.

[0270] Cushion member 351 is arranged so as to cover the edge of hole 304D. Cushion member 351 is a substantially cylindrical member. First lead wire 385 and second lead wire 395 each pass through a passage inside cushion member 351. Sponge 352 is arranged in the passage of cushion member 351. Sponge 352 is arranged so as to fill the gap between the inner circumferential surface of cushion member 351 and the outer surface of first lead wire 385. Sponge 352 is arranged so as to fill the gap between the inner circumferential surface of cushion member 351 and the outer surface of second lead wire 395. When grease (lubricant) is arranged inside hammer case 304, sponge 352 prevents the grease from leaking from the inside to the outside of hammer case 304 through the passage of cushion member 351.

[0271] The front end of the first lead wire 385 is connected to the first sensor board 380, and the rear end of the first lead wire 385 is connected to the controller 318. The first lead wire 385 extending from the first sensor board 380 is routed rearward inside the hammer case 304, then passes through a passage in the cushion member 351, and reaches below the hammer case 304. The first lead wire 385, which has been routed rearward below the hammer case 304, reaches the inside of the grip portion 322. After passing through the passage in the cushion member 351, the wiring paths of the first lead wire 385 and the lead wire 363 are substantially the same.

[0272] The front end of the second lead wire 395 is connected to the lower end of the second sensor board 390, and the rear end of the second lead wire 395 is connected to the controller 318. The second lead wire 395 extending from the second sensor board 390 passes through a passage in the cushion member 351 and reaches below the hammer case 304. The second lead wire 395 is routed rearward below the hammer case 304 and reaches the inside of the grip portion 322. After passing through the passage in the cushion member 351, the wiring paths of the second lead wire 395, the first lead wire 385, and the lead wire 263 are substantially the same.

[0273] As described above, in the embodiment, in the impact tool 1D which is an impact wrench, the first sensor board 380 detects the rotation of the anvil 310, and the second sensor board 390 detects the movement of the hammer 347. The controller 318 can control the tightening torque based on the detection data of the first sensor 382 and the second sensor 392.

[0274] [Fifth embodiment] A fifth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0275] FIG. 54 is a side view showing an impact tool according to a fifth embodiment. FIG. 55 is a cross-sectional view showing an impact tool according to the fifth embodiment. FIG. 56 is a longitudinal cross-sectional view showing a front part of the impact tool according to the fifth embodiment. FIG. 57 is a perspective cross-sectional view showing a front part of the impact tool according to the fifth embodiment. FIG. 58 is a rear perspective view showing an anvil and a first sensor board according to the fifth embodiment. FIG. 59 is a front perspective view showing an anvil and a first sensor board according to the fifth embodiment. FIG. 60 is a rear perspective view showing a first sensor board according to the fifth embodiment. FIG. 61 is a rear perspective view showing a hammer and a second sensor board according to the fifth embodiment. FIG. 62 is a front perspective view showing a hammer and a second sensor board according to the fifth embodiment. FIG. 63 is a front perspective view showing a second sensor board according to the fifth embodiment. FIG. 64 is a bottom perspective view showing a hammer case according to the fifth embodiment.

[0276] In this embodiment, the impact tool 1E is an angle impact wrench and includes a housing 402, a hammer case 404, a spindle 408, a striking mechanism 409, an anvil 410, a battery mounting portion 413, a trigger lever 414, a forward / reverse rotation switching lever 415, a first sensor board 480, a second sensor board 490, and a controller 418.

[0277] The housing 402 has a motor accommodating portion 421 , a rear grip portion 422 , a battery holding portion 423 , and an upper grip portion 424 .

[0278] The motor housing 421 is cylindrical. The rear grip 422 is disposed behind the motor housing 421. The trigger lever 414 is provided in the front of the rear grip 422. The rear grip 422 is held by an operator. The upper grip 424 connects the upper part of the rear grip 422 to the motor housing 421. The battery holding portion 423 is connected to the lower end of the rear grip 422.

[0279] The hammer case 404 includes a rear-side tubular portion 404A, a front-side tubular portion 404B, and an annular portion 404C. The front-side tubular portion 404B is disposed forward of the rear-side tubular portion 404A. The outer diameter of the rear-side tubular portion 404A is larger than the outer diameter of the front-side tubular portion 404B. The inner diameter of the rear-side tubular portion 404A is larger than the inner diameter of the front-side tubular portion 404B. The annular portion 404C is disposed to connect the front end portion of the rear-side tubular portion 404A and the rear end portion of the front-side tubular portion 404B.

[0280] The hammer case 404 is connected to the front part of the motor housing part 421. The motor housing part 421 is fixed to the rear part of the hammer case 404.

[0281] The spindle 408 is rotated by the torque of a motor (not shown). The rotation axis AX of the motor extends in the front-rear direction.

[0282] The striking mechanism 409 has a hammer 447, a ball 448, and a coil spring 449. The striking mechanism 409 including the hammer 447 is housed in a hammer case 404.

[0283] The hammer 447 has a body portion 447D, a hammer groove 447A, and a hammer protrusion 447B. The body portion 447D is arranged around the spindle 408. The body portion 447D is annular. A recess 447C is provided at the rear portion of the body portion 447D. The recess 447C is provided so as to be recessed forward from the rear end portion of the body portion 447D. The recess 447C is ring-shaped. The hammer protrusion 447B protrudes forward from the body portion 447D. Two hammer protrusions 447B are provided.

[0284] The anvil 410 has a rod-shaped anvil shaft portion 410A and an anvil protrusion portion 410B. The anvil protrusion portion 410B is provided at the rear end portion of the anvil 410. The anvil protrusion portion 410B protrudes radially outward from the rear end portion of the anvil shaft portion 410A.

[0285] The battery mounting section 413 is disposed below the battery holding section 423. The battery pack 425 is mounted in the battery mounting section 413. The battery pack 425 is detachable from the battery mounting section 413.

[0286] The impact tool 1E has a first sensor board 480 that detects the rotation of the anvil 410 and a second sensor board 490 that detects the movement of the hammer 447.

[0287] The anvil 410 has a rod-shaped anvil shaft portion 410A and a pair of anvil protrusions 410B extending radially outward from the upper end of the anvil shaft portion 410A. The first sensor substrate 480 detects rotation of the anvil 410 about the rotation axis CX. The first sensor substrate 480 detects at least one of the position, angular velocity, and angular acceleration of the anvil 410 in the rotational direction about the rotation axis CX.

[0288] The hammer 447 has an annular body portion 447D, a pair of hammer protrusions 447B provided at the lower end of the body portion 447D, a hammer groove 447A in which a ball 448 is disposed, and a recess 447C provided at the rear of the body portion 447D. The second sensor substrate 490 detects movement of the hammer 447 in the axial direction (up and down direction). The second sensor substrate 490 detects at least one of the position, movement speed, and movement acceleration of the hammer 447 in the axial direction.

[0289] The first sensor board 480 and the second sensor board 490 are each disposed inside the hammer case 404. The first sensor board 480 and the second sensor board 490 are each fixed to the hammer case 404. The first sensor board 480 is supported on the upper surface of the annular portion 404C of the hammer case 404. The second sensor board 490 is supported on the rear portion of the rear cylindrical portion 404A of the hammer case 404.

[0290] The light unit 417 and the controller 418 are connected by a lead wire 463. Current from the battery pack 425 is supplied to the light unit 417 via the controller 418 and the lead wire 463. When current is supplied to the light unit 417, illumination light is emitted from the light unit 417. A front end of the lead wire 463 is connected to the light unit 417, and a rear end of the lead wire 463 is connected to the top surface of the controller 418. The lead wire 463 passes through the lower part inside the motor accommodating portion 421. A portion of the lead wire 463 passes below the hammer case 404. The lead wire 463 passes below a cushion member 451, which will be described later, and then is routed along the same path as the first lead wire 485 and the second lead wire 495.

[0291] The anvil 410 has a rod-shaped anvil shaft portion 410A and a pair of anvil protrusions 410B extending radially outward from the rear end of the anvil shaft portion 410A. The anvil protrusions 410B include a first anvil protrusion 410B1 and a second anvil protrusion 410B2. The first sensor substrate 480 detects rotation of the anvil 410 about the rotation axis AX. The first sensor substrate 480 detects at least one of the position, angular velocity, and angular acceleration of the anvil 410 in the rotational direction about the rotation axis AX.

[0292] First sensor board 480 has first circuit board 481 and a plurality of first sensors 482 mounted on the rear surface of first circuit board 481.

[0293] The first circuit board 481 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The first circuit board 481 is arranged around at least a portion of the anvil shaft portion 410A. In the embodiment, the first circuit board 481 is annular and arranged around the anvil shaft portion 410A. The first circuit board 481 has a protrusion 481T on its upper portion. The protrusion 481T protrudes upward from the upper portion of the first circuit board 481. The protrusion 481T fixes the position of the first sensor board 480 in the rotational direction relative to the hammer case 404.

[0294] The peripheral edge of the rear surface of the first circuit board 481 is supported by a retaining ring 453. The retaining ring 453 contacts the peripheral edge of the rear surface of the first circuit board 481. The retaining ring 453 fits into a groove provided on the inner peripheral surface of the hammer case 404. The retaining ring 453 prevents the first sensor board 480 from moving rearward. The front surface of the first circuit board 481 contacts the rear surface of the annular portion 404C. The retaining ring 453 fixes the position of the first sensor board 480 in the front-to-rear direction relative to the hammer case 404.

[0295] First sensor 482 detects the rotation of anvil 410. First sensor 482 is mounted on the rear surface of first circuit board 481. First sensor 482 is disposed at a position facing the front surface of anvil protrusion 410B.

[0296] The first sensor 482 includes an induction sensor. Because the anvil 410 is made of metal, the first sensor 482 can detect the rotation of the anvil 410 without contact. The rotation of the anvil 410 can also be interpreted as the position of the anvil 410 in the rotational direction. That is, the first sensor 482 can detect the position of the anvil 410 in the rotational direction without contact. Furthermore, the rotation of the anvil 410 can also be interpreted as the number of rotations of the anvil 410. That is, the first sensor 482 can detect the number of rotations of the anvil 410 without contact.

[0297] A plurality of first sensors 482 are provided in the circumferential direction. In the embodiment, eight first sensors 482 are provided at equal intervals in the circumferential direction on the rear surface of first circuit board 481. First sensors 482 include first sensor 482A, first sensor 482B, first sensor 482C, first sensor 482D, first sensor 482E, first sensor 482F, first sensor 482G, and first sensor 482H. In the circumferential direction, if the position of the top of the first sensor substrate 81 is the 0[°] position, the position of the right part is the 90[°] position, the position of the bottom is the 180[°] position, and the position of the left part is the 270[°] position, first sensor 482A is positioned at the 0[°] position, first sensor 482B is positioned at the 45[°] position, first sensor 482C is positioned at the 90[°] position, first sensor 482D is positioned at the 135[°] position, first sensor 482E is positioned at the 180[°] position, first sensor 482F is positioned at the 225[°] position, first sensor 482G is positioned at the 270[°] position, and first sensor 482H is positioned at the 315[°] position.

[0298] Fig. 58 shows a state in which the first anvil protrusion 410B1 and the first sensor 482A face each other, and the second anvil protrusion 410B2 and the first sensor 482E face each other. In the state shown in Fig. 58, the first sensor 482A detects the first anvil protrusion 410B1, and the first sensor 482E detects the second anvil protrusion 410B2.

[0299] When the anvil 410 rotates 45° from the state shown in Figure 58 so that the first anvil protrusion 410B1 faces the first sensor 482B and the second anvil protrusion 410B2 faces the first sensor 482F, the first sensor 482B detects the first anvil protrusion 410B1 and the first sensor 482F detects the second anvil protrusion 410B2.

[0300] When the anvil 410 rotates 315° from the state shown in Figure 58 and the first anvil protrusion 410B1 faces the first sensor 482H and the second anvil protrusion 410B2 faces the first sensor 482D, the first sensor 482H detects the first anvil protrusion 410B1 and the first sensor 482D detects the second anvil protrusion 410B2.

[0301] Second sensor board 490 has second circuit board 491 and a plurality of second sensors 492 mounted on the upper surface of second circuit board 491.

[0302] The second circuit board 491 may be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The second circuit board 491 is disposed so as to face the rear part of the outer surface of the body part 447D of the hammer 447. In the embodiment, the second circuit board 491 is in the shape of a plate facing the rear surface of the body part 447D.

[0303] The second sensor 492 detects the axial movement of the hammer 447. The second sensor 492 is mounted on the upper surface of the second circuit board 491. The second sensor 492 is disposed at a position facing the lower surface of the body portion 447D.

[0304] The second sensor 492 includes an induction sensor. Because the hammer 447 is made of metal, the second sensor 492 can detect the movement of the hammer 447 without contact. The movement of the hammer 447 can also be expressed as the position of the hammer 447 in the front-rear direction. That is, the second sensor 492 can detect the position of the hammer 447 in the front-rear direction without contact. Furthermore, the movement of the hammer 447 can also be expressed as the movement speed of the hammer 447. That is, the second sensor 492 can detect the movement speed of the hammer 447 without contact.

[0305] A plurality of second sensors 492 are provided in the axial direction. In the embodiment, two second sensors 492 are provided in the axial direction on the upper surface of second circuit board 491. Second sensors 492 include second sensor 492A and second sensor 492B. Second sensor 492A is disposed forward of second sensor 492B.

[0306] Fig. 61 shows a state in which the hammer 447 does not face either the second sensor 492A or the second sensor 492B. In the state shown in Fig. 61, neither the second sensor 492A nor the second sensor 492B detects the hammer 447.

[0307] When the hammer 447 moves rearward from the state shown in Figure 61 so that the hammer 447 faces the second sensor 492A but does not face the second sensor 492B, the second sensor 492A detects the hammer 447 but the second sensor 492B does not detect the hammer 447.

[0308] When the hammer 447 moves further rearward and faces the second sensors 492A and 492B, the second sensors 492A and 492B each detect the hammer 447. Note that it is also possible that the second sensor 492B detects the hammer 447 and the second sensor 492A does not detect the hammer 447.

[0309] The first circuit board 481 and the controller 418 are connected by a first lead wire 485. The second circuit board 491 and the controller 418 are connected by a second lead wire 495. The detection data of the first sensor 482 is transmitted to the controller 418 via the first lead wire 485. The detection data of the second sensor 492 is transmitted to the controller 418 via the second lead wire 495. The controller 418 controls the tightening torque when the impact tool 1E tightens a fastening part such as a bolt or a nut, based on the detection data of the first sensor 482 and the detection data of the second sensor 492.

[0310] The first circuit board 481 and the second circuit board 91 are each disposed inside the hammer case 404. The hammer case 404 has a hole 404D through which the first lead wire 485 and the second lead wire 495 pass. The first lead wire 485 and the second lead wire 495 exit the hammer case 404 through the hole 404D and are then connected to the controller 418.

[0311] A cushion member 451 is arranged so as to cover the edge of hole 404D. Cushion member 451 is a substantially cylindrical member. First lead wire 485 and second lead wire 495 each pass through a passage inside cushion member 451. A sponge 452 is arranged in the passage of cushion member 451. Sponge 452 is arranged so as to fill the gap between the inner circumferential surface of cushion member 451 and the outer surface of first lead wire 485. Sponge 452 is arranged so as to fill the gap between the inner circumferential surface of cushion member 451 and the outer surface of second lead wire 495. When grease (lubricant) is arranged inside hammer case 404, sponge 452 prevents the grease from leaking from the inside to the outside of hammer case 404 through the passage of cushion member 451.

[0312] The front end of the first lead wire 485 is connected to the first sensor board 480, and the rear end of the first lead wire 485 is connected to the top surface of the controller 418. The first lead wire 485 extending from the first sensor board 480 passes below the hammer 447 inside the hammer case 404 and reaches below the second sensor board 490. The first lead wire 485 routed rearward below the second sensor board 490 passes through a passage in the cushion member 451 and reaches below the hammer case 404. The first lead wire 485 routed rearward below the hammer case 404 passes inside the motor accommodating portion 421 and reaches the controller 418. The wiring paths of the first lead wire 485 and the lead wire 463 after passing through the passage in the cushion member 451 are substantially the same.

[0313] The front end of the second lead wire 495 is connected to the underside of the second sensor board 490, and the rear end of the second lead wire 495 is connected to the top surface of the controller 418. The second lead wire 495 extending from the second sensor board 490 passes through a passage in the cushion member 451 and reaches below the hammer case 404. The second lead wire 495 routed rearward below the hammer case 404 passes inside the motor accommodating portion 421 and reaches the controller 418. After passing through the passage in the cushion member 451, the wiring paths of the second lead wire 495, the first lead wire 485, and the lead wire 463 are substantially the same.

[0314] As described above, in the embodiment, in the impact tool 1E which is an impact wrench, the first sensor board 480 detects the rotation of the anvil 410, and the second sensor board 490 detects the movement of the hammer 447. The controller 418 can control the tightening torque based on the detection data of the first sensor 482 and the second sensor 492.

[0315] [Sixth embodiment] A sixth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0316] FIG. 65 is a cross-sectional view showing an impact tool 1F according to a sixth embodiment. The impact tool 1F is an impact driver such as that disclosed in U.S. Patent Application Publication No. 2023 / 0256580. The impact tool 1F includes a hammer case 504, a motor 506, a sensor board 537 that detects rotation of the rotor of the motor 506, a speed reduction mechanism 507, a spindle 508, a striking mechanism 509, an anvil 510, a trigger switch 514, a light unit 517, a controller 518, a motor housing 521, a grip 522, a battery holder 523, and a hammer 547. The impact tool 1F may also be provided with a first sensor board 580 and a second sensor board 590.

[0317] The light unit 517 and the controller 518 are connected by a lead wire 563. The first sensor board 580 and the controller 518 are connected by a lead wire 585. The second sensor board 590 and the controller 518 are connected by a lead wire 595. The controller 518 has a circuit board 518B, a microcomputer 518D mounted on the circuit board 518B, six switch elements 518J, and a capacitor 518K.

[0318] [Seventh embodiment] A seventh embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0319] FIG. 66 is a cross-sectional view showing an impact tool 1G according to a seventh embodiment. The impact tool 1G is an impact wrench such as that disclosed in U.S. Patent Application Publication No. 2023 / 0302611. The impact tool 1G includes a hammer case 604, a motor 606, a reduction mechanism 607, a spindle 608, a striking mechanism 609, an anvil 610, a trigger switch 614, a motor housing 621, a grip 622, a battery holder 623, and a hammer 647. The impact tool 1G may also be provided with a first sensor board 680 and a second sensor board 690.

[0320] The light unit 617 and the controller 618 are connected by a lead wire 663. The first sensor board 680 and the controller 618 are connected by a lead wire 685. The second sensor board 690 and the controller 618 are connected by a lead wire 695. The controller 618 has a microcomputer 618D and six switch elements 618J.

[0321] [Eighth embodiment] An eighth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0322] FIG. 67 is a cross-sectional view showing an impact tool 1H according to an eighth embodiment. The impact tool 1H is an impact wrench such as that disclosed in U.S. Patent Application Publication No. 2022 / 0274246. The impact tool 1H includes a hammer case 704, a motor 706, a reduction mechanism 707, a spindle 708, a striking mechanism 709, an anvil 710, a trigger switch 714, a motor housing 721, a grip 722, a battery holder 723, and a hammer 747. The impact tool 1H may also be provided with a first sensor board 780 and a second sensor board 790.

[0323] The light unit 717 and the controller 718 are connected by a lead wire 763. The first sensor board 780 and the controller 718 are connected by a lead wire 785. The second sensor board 790 and the controller 718 are connected by a lead wire 761. The motor 706 and the controller 718 are connected by a lead wire 795.

[0324] [Ninth embodiment] A ninth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0325] FIG. 68 is a cross-sectional view showing an impact tool 1I according to a ninth embodiment. The impact tool 1I is an impact driver as disclosed in European Patent Application Publication No. 4,260,984. The impact tool 1I includes a hammer case 804, a motor 806, a reduction gear mechanism 807, a spindle 808, a striking mechanism 809, an anvil 810, a trigger switch 814, a controller 818, a motor housing 821, a grip 822, a battery holder 823, and a hammer 847. The controller 818 is disposed in the grip 822. The impact tool 1I may also be provided with a first sensor board 880 and a second sensor board 890.

[0326] The motor 806 and the controller 818 are connected by a lead wire 861. The sensor board 837 that detects the rotation of the rotor of the motor 806 and the controller 818 are connected by a lead wire 862. The light unit 817 and the controller 818 are connected by a lead wire 863. The first sensor board 880 and the controller 818 are connected by a lead wire 885. The second sensor board 890 and the controller 818 are connected by a lead wire 895.

[0327] [Tenth embodiment] A tenth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are designated by the same reference numerals, and the description of those components will be simplified or omitted.

[0328] FIG. 69 is a cross-sectional view showing an impact tool 1J according to a tenth embodiment. The impact tool 1J is an impact wrench such as that disclosed in U.S. Patent Application Publication No. 2023 / 0253855. The impact tool 1J includes a hammer case 904, a motor 906, a reduction gear mechanism 907, a spindle 908, a striking mechanism 909, an anvil 910, a trigger switch 914, a controller 918, a motor housing 921, a rear grip 922, a battery holder 923, an upper grip 924, and a hammer 947. The impact tool 1J may also be provided with a first sensor board 980 and a second sensor board 990.

[0329] The light unit 917 and the controller 918 are connected by a lead wire 963. The first sensor board 980 and the controller 918 are connected by a lead wire 985. The second sensor board 990 and the controller 918 are connected by a lead wire 995. The lead wire 985 extends forward from the front surface of the first sensor board 980, passes through a through hole provided in the hammer case 904, is extended forward of the hammer case 904, and then is extended rearward below the hammer case 904. A sponge may be placed in the through hole of the hammer case 904 to prevent grease from leaking out.

[0330] [Eleventh embodiment] An eleventh embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0331] FIG. 70 is a cross-sectional view showing an impact tool 1K according to an eleventh embodiment. The impact tool 1K is an angle impact wrench. The impact tool 1K includes a housing 1002, a hammer case 1004, a motor 1006, a reduction gear mechanism 1007, a spindle 1008, a striking mechanism 1009, an anvil 1010, a trigger lever 1014, a controller 1018, a hammer 1047, a battery mounting portion 1013, and a torque switching panel 155. The impact tool 1K may also be provided with a first sensor board 1080 and a second sensor board 1090. A first lead wire 1085 is connected to the first sensor board 1080, and a second lead wire 1095 is connected to the second sensor board 1090. The battery mounting portion 1013 is disposed at the rear of the housing 1002, and the torque switching panel 1055 is disposed at the top of the housing 1002. A battery pack 1025 is attached to the battery attachment section 1013 .

[0332] The light unit 1017 and the controller 1018 are connected by a lead wire 1063. The first sensor board 1080 and the controller 1018 are connected by a lead wire 1085. The second sensor board 1090 and the controller 1018 are connected by a lead wire 1095.

[0333] [Twelfth embodiment] A twelfth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiments will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0334] Fig. 71 is a perspective view showing a first sensor board 1180 according to the twelfth embodiment. The first sensor board 1180 has a first circuit board 1181 and a first sensor 1182. A first lead wire 1185 is connected to the first circuit board 1181. As shown in Fig. 71, the first circuit board 1181 does not have to be annular, and may be arc-shaped. [Explanation of symbols]

[0335] 1A...Impact tool, 1B...Impact tool, 1C...Impact tool, 1D...Impact tool, 1E...Impact tool, 1F...Impact tool, 1G...Impact tool, 1H...Impact tool, 1I...Impact tool, 1J...Impact tool, 1K...Impact tool, 2...Housing, 2S...Screw, 3...Rear cover, 3S...Screw, 4...Hammer case, 4A...Rear cylinder part, 4B...Front cylinder part, 4C...Annular part, 4D...Hole, 4E...Groove, 4Ea...Ceiling surface, 4Eb...Bottom surface, 4F...Support surface, 4Fa...Side support surface, 4Fb...Front support surface, 4G...Space, 4R...Recess, 5...Cover , 6...motor, 7...reduction mechanism, 8...spindle, 8A...flange portion, 8B...spindle shaft portion, 8C...annular portion, 8D...spindle groove, 9...impact mechanism, 10...anvil (output portion), 10A...anvil shaft portion, 10B...anvil protrusion portion, 10B1...first anvil protrusion portion, 10B2...second anvil protrusion portion, 10C...bit hole, 10D...support recess, 10E...retaining groove, 11...switch body, 12...fan, 12A...bush, 13...battery mounting portion, 14...trigger lever, 15...forward / reverse switching lever, 16...tool holding mechanism, 16A...ball, 16B...leaf Spring, 16C...sleeve, 16D...coil spring, 16E...positioning member, 16F...washer, 16G...support ring, 16H...tubular portion, 16J...protrusion, 16K...support surface, 17...light unit, 18...controller, 18A...controller case, 18B...circuit board, 18C...molding resin, 18D...microcomputer, 18E...control circuit, 18F...processor, 18G...non-volatile memory, 18H...volatile memory, 18J...switching element, 18K...capacitor, 18L...resistor, 18M...transistor, 19...intake port, 20...exhaust port, 21 ...Motor housing section, 22...Grip section, 23...Battery holding section, 24...Bearing box, 25...Battery pack, 26...Stator, 27...Rotor, 28...Stator core, 29...Front insulator, 29S...Screw, 30...Rear insulator, 31...Coil, 32...Rotor core section, 33...Rotor shaft section, 34...Rotor magnet, 35...Sensor magnet, 37...Sensor board, 39...Rotor bearing, 40...Rotor bearing, 41...Pinion gear, 42...Planetary gear, 42P...Pin, 43...Internal gear, 44...Spindle bearing, 45...Washer,46...anvil bearing, 47...hammer, 47A...hammer groove, 47B...hammer protrusion, 47C...recess, 47D...body, 48...ball, 49...coil spring, 50...ball, 51...cushion member, 52...sponge, 53...retaining ring, 54...washer, 61...lead wire, 62...lead wire, 63...lead wire, 80...first sensor board, 81...first circuit board, 81T...protrusion, 82...first sensor, 82A...first sensor, 82B...first sensor, 82C...first sensor, 82D...first sensor, 82E...first sensor, 82F...first sensor, 82G...first sensor, 82 H...first sensor, 85...first lead wire, 85C...connector, 90...second sensor board, 91...second circuit board, 92...second sensor, 92A...second sensor, 92B...second sensor, 95...second lead wire, 95C...connector, 102...housing, 104...hammer case, 104A...rear side cylindrical portion, 104B...front side cylindrical portion, 104C...annular portion, 104D...hole, 106...motor, 107...reduction mechanism, 108...spindle, 108F...recess, 109...striking mechanism, 110...anvil, 110A...anvil shaft portion, 110B...anvil protrusion portion, 110B1...first anvil protrusion portion, 110B2...second anvil protrusion, 110F...protrusion, 111...switch body, 112...fan, 113...battery mounting section, 114...trigger lever, 115...forward / reverse switching lever, 117...light unit, 118...controller, 118A...controller case, 118B...circuit board, 118C...molded resin, 118D...microcomputer, 118J...switch element, 118K...capacitor, 118L...resistor, 118M...transistor, 121...motor accommodating section, 122...grip section, 123...battery holding section, 125...battery pack, 146... bearing, 147...hammer, 147A...hammer groove, 147B...hammer protrusion, 147C...recess, 147D...body, 148...ball, 149...coil spring, 151...cushion member, 152...sponge, 153...retaining ring, 154...washer, 161...lead wire, 162...lead wire, 163...lead wire, 180...first sensor board, 181...first circuit board, 181T...protrusion, 182...first sensor, 182A...first sensor, 182B...first sensor, 182C...first sensor, 182D...first sensor, 182E...first sensor, 182F...first sensor,182G...first sensor, 182H...first sensor, 185...first lead wire, 185C...connector, 190...second sensor board, 191...second circuit board, 192...second sensor, 192A...second sensor, 192B...second sensor, 195...second lead wire, 195C...connector, 202...housing, 204...hammer case, 204A...rear side cylindrical portion, 204B...front side cylindrical portion, 204C...annular portion, 204D...hole, 208...spindle, 209...striking mechanism, 210...anvil, 210A...anvil shaft portion, 210B...anvil protrusion portion, 210B1...first anvil protrusion portion, 210B2...second anvil protrusion, 211...switch body, 213...battery mounting portion, 214...trigger lever, 215...forward / reverse switching lever, 217...light unit, 218...controller, 221...motor housing portion, 222...rear grip portion, 223...battery holding portion, 224...front grip portion, 225...battery pack, 247...hammer, 247A...hammer groove, 247B...hammer protrusion portion, 247C...recess, 247D...body portion, 248...ball, 249...coil spring, 251...cushion member, 252...sponge, 246...anvil bearing ring, 253...retaining ring, 254...washer, 261...lead wire, 262...lead wire, 263...lead wire, 280...first sensor board, 281...first circuit board, 281T...projection, 282...first sensor, 282A...first sensor, 282B...first sensor, 282C...first sensor, 282D...first sensor, 282E...first sensor, 282F...first sensor, 282G...first sensor, 282H...first sensor, 285...first lead wire, 290...second circuit board, 291...second circuit board, 292...second sensor, 292A...second sensor, 292B...second sensor, 295...second Cord wire, 302...housing, 304...hammer case, 304A...upper cylindrical portion, 304B...lower cylindrical portion, 304C...annular portion, 304D...hole, 304E...recess, 308...spindle, 309...striking mechanism, 310...anvil, 310A...anvil shaft portion, 310B...anvil protrusion portion, 310B1...first anvil protrusion portion, 310B2...second anvil protrusion portion, 313...battery mounting portion, 314...trigger lever, 315...forward / reverse switching lever, 317...light unit, 318...controller, 321...motor accommodating portion, 322...grip portion, 323...battery holding portion,325...battery pack, 346...anvil bearing, 347...hammer, 347A...hammer groove, 347B...hammer protrusion, 347C...recess, 347D...body portion, 348...ball, 349...coil spring, 351...cushion member, 352...sponge, 353...retaining ring, 363...lead wire, 380...first sensor board, 381...first circuit board, 381T...protrusion, 382...first sensor, 382A...first sensor 382B...first sensor, 382C...first sensor, 382D...first sensor, 382E...first sensor, 382F...first sensor, 382G...first sensor, 382H...first sensor, 385...first lead wire, 390...second circuit board, 391...second circuit board, 392...second sensor, 392A...second sensor, 392B...second sensor, 395...second lead wire, 402...housing, 404...hammer case, 404A...rear side Cylindrical portion, 404B...front cylindrical portion, 404C...annular portion, 404D...hole, 408...spindle, 409...striking mechanism, 410...anvil, 410A...anvil shaft portion, 410B...anvil protrusion portion, 410B1...first anvil protrusion portion, 410B2...second anvil protrusion portion, 413...battery mounting portion, 414...trigger lever, 415...forward / reverse rotation switching lever, 417...light unit, 418...controller, 421...motor Housing portion, 422...rear grip portion, 423...battery holding portion, 424...upper grip portion, 425...battery pack, 447...hammer, 447A...hammer groove, 447B...hammer protrusion portion, 447C...recess, 447D...body portion, 448...ball, 449...coil spring, 451...cushion member, 452...sponge, 453...retaining ring, 463...lead wire, 480...first sensor board, 481...first circuit board, 481T...protrusion, 482...first sensor, 482A...first sensor, 482B...first sensor, 482C...first sensor, 482D...first sensor, 482E...first sensor, 482F...first sensor, 482G...first sensor, 482H...first sensor, 485...first lead wire, 490...second circuit board, 491...second circuit board, 492...second sensor, 492A...second sensor, 492B...second sensor, 495...second lead wire, 504...hammer case, 506...motor, 507...reduction mechanism, 508...spindle, 509...impact mechanism, 510...anvil, 514...trigger switch 517...light unit, 518...controller, 518B...circuit board, 518D...microcomputer, 518J...switch element, 518K...capacitor, 521...motor accommodating section, 522...grip section, 523...battery holding section, 537...sensor board, 547...hammer, 580...first sensor board, 585...lead wire, 590...second sensor board, 595...lead wire, 604...hammer case, 606...motor, 607...reduction mechanism, 608...spindle, 609...impact mechanism, 610...anvil, 614...trigger switch, 617...light unit, 61 8...controller, 618D...microcomputer, 618J...switching element, 618K...capacitor, 621...motor housing, 622...grip portion, 623...battery holding portion, 647...hammer, 680...first sensor board, 685...lead wire, 690...second sensor board, 695...lead wire, 704...hammer case, 706...motor, 761...lead wire, 707...reduction mechanism, 708...spindle, 709...impact mechanism, 710...anvil, 714...trigger switch, 717...light unit, 718...controller, 721...motor housing, 722...rear Grip portion, 723...battery holding portion, 747...hammer, 780...first sensor board, 785...lead wire, 790...second sensor board, 795...lead wire, 804...hammer case, 806...motor, 807...reduction mechanism, 808...spindle, 809...impact mechanism, 810...anvil, 814...trigger switch, 817...light unit, 818...controller, 821...motor accommodating portion, 822...grip portion, 823...battery holding portion, 837...sensor board, 847...hammer, 861...lead wire, 862...lead wire, 863...lead wire, 880...first sensor board,885...lead wire, 890...second sensor board, 895...lead wire, 904...hammer case, 906...motor, 907...reduction mechanism, 908...spindle, 909...impact mechanism, 910...anvil, 914...trigger switch, 917...light unit, 918...controller, 921...motor accommodating section, 922...rear grip section, 923...battery holding section, 924...upper grip section, 947...hammer, 963...lead wire, 980...first sensor board, 985...lead wire, 990...second sensor board, 995...lead wire, 1002...housing, 1004...hammer case, 100 6...motor, 1007...reduction mechanism, 1008...spindle, 1009...impact mechanism, 1010...anvil, 1013...battery mounting section, 1014...trigger lever, 1017...light unit, 1018...controller, 1025...battery pack, 1047...hammer, 1055...torque switching panel, 1063...lead wire, 1080...first sensor board, 1085...first lead wire, 1090...second sensor board, 1095...second lead wire, 1180...first sensor board, 1181...first circuit board, 1182...first sensor, 1185...first lead wire, AX...rotating axis, CX...rotating axis.

Claims

1. Housing and a motor accommodated in the housing; a hammer rotated by the motor; an anvil that is struck in a rotational direction by the hammer; a hammer case that houses the hammer; a first sensor that detects rotation of the anvil; a second sensor for detecting movement of the hammer; a controller that controls the tightening torque based on the detection data of the first sensor and the second sensor, The anvil has a bit hole into which a tool bit is inserted. Impact tool.

2. The housing includes: a motor housing portion that houses the motor; a grip portion extending downward from the motor housing portion; A battery holding portion connected to a lower end of the grip portion, The impact tool according to claim 1 .

3. Housing and a motor accommodated in the housing; a hammer rotated by the motor; an anvil that is struck in a rotational direction by the hammer; a hammer case that houses the hammer; a first sensor that detects rotation of the anvil; a second sensor for detecting movement of the hammer; a controller that controls the tightening torque based on the detection data of the first sensor and the second sensor, The housing includes: a motor housing portion that houses the motor; a rear grip portion extending downward from the motor housing portion; a front grip portion disposed forward of the rear grip portion; a battery holding portion connected to a lower end of the rear grip portion and a lower end of the front grip portion, Impact tool.

4. a grip portion extending in the front-rear direction; a housing connected to the grip portion; a motor accommodated in the housing; a hammer rotated by the motor; an anvil that is struck in a rotational direction by the hammer and extends in a vertical direction; a hammer case that houses the hammer; a first sensor that detects rotation of the anvil; a second sensor for detecting movement of the hammer; a controller that controls the tightening torque based on the detection data of the first sensor and the second sensor. Impact tool.

5. Housing and a motor accommodated in the housing; a hammer rotated by the motor; an anvil that is struck in a rotational direction by the hammer; a hammer case that houses the hammer; a first sensor that detects rotation of the anvil; a second sensor for detecting movement of the hammer; a controller that controls the tightening torque based on the detection data of the first sensor and the second sensor, The housing includes: a motor housing portion that houses the motor; a rear grip portion disposed behind the motor housing portion; an upper grip portion connecting an upper portion of the rear grip portion and the motor housing portion; a battery holding portion connected to a lower end of the rear grip portion, Impact tool.

6. the first sensor is mounted on a first circuit board; the second sensor is mounted on a second circuit board; a first lead wire connecting the first circuit board and the controller; a second lead wire connecting the second circuit board and the controller; An impact tool according to any one of claims 1 to 5.

7. the first circuit board and the second circuit board are each disposed inside the hammer case; the hammer case has holes through which the first lead wire and the second lead wire pass; 7. The impact tool according to claim 6.

8. The anvil has an anvil shaft portion and an anvil protrusion portion, the first circuit board is disposed around at least a portion of the anvil shaft portion; the first sensor is disposed at a position facing the anvil protrusion; 7. The impact tool according to claim 6.

9. the second circuit board is a plate-like board facing the outer surface of the hammer, The second sensor is disposed at a position facing the outer surface of the hammer.

7. The impact tool according to claim 6.

Images