Impact tool

Abstract

The invention provides an impact tool which enables various types of impact tools to be fastened at a specified torque amplitude. The impact tool has: a housing; a motor accommodated in the housing; a hammer rotated by the motor; an anvil hit by the hammer in the rotational direction; a hammer housing 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 the fastening torque based on detection data of the first sensor and the second sensor. The anvil has a bit hole into which a tip tool is inserted.

Description

Technical Field

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

[0002] Bolts used for fastening structures etc. are sometimes tightened with a predetermined torque range. For example, Patent Document 1 is known.

[0003] Patent Document 1: U.S. Patent Application Publication No. 2023 / 0302611

[0004] However, conventional technologies have used T-handle impact wrenches to tighten at a predetermined torque range. Impact tools come in various forms, and impact tools other than T-handle impact wrenches have not been designed to tighten at a predetermined torque. Summary of the Invention

[0005] An object of the technology disclosed in this specification is to enable fastening at a predetermined torque range in various types of impact tools.

[0006] This specification discloses an impact tool. The impact tool comprises: a housing; a motor housed in the housing; a hammer rotated by the motor; an anvil struck by the hammer in a rotational direction; a hammer housing housing the hammer; a first sensor detecting rotation of the anvil; a second sensor detecting movement of the hammer; and a controller controlling tightening torque based on detection data from the first and second sensors. The anvil has a tool bit hole for inserting a top tool.

[0007] Effects of the Invention

[0008] According to the above configuration, various types of impact tools can be tightened with a predetermined torque range. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a side view showing the impact tool according to the first embodiment.

[0010] Figure 2 It is a cross-sectional view showing the impact tool according to the first embodiment.

[0011] Figure 3 It is a longitudinal sectional view showing the upper portion of the impact tool according to the first embodiment.

[0012] Figure 4 It is a perspective sectional view showing an upper portion of the impact tool according to the first embodiment.

[0013] Figure 5 It is a longitudinal sectional view showing the tool holding mechanism according to the first embodiment.

[0014] Figure 6 This is a block diagram showing a controller according to the first embodiment.

[0015] Figure 7 It is a cross-sectional view showing the upper portion of the impact tool according to the first embodiment.

[0016] Figure 8 It is a cross-sectional view showing the upper portion of the impact tool according to the first embodiment.

[0017] Figure 9 It is a cross-sectional view showing the upper portion of the impact tool according to the first embodiment.

[0018] Figure 10 It is a perspective view showing the anvil and the first sensor substrate according to the first embodiment as viewed from the rear.

[0019] Figure 11 This is a perspective view showing the anvil and the first sensor substrate according to the first embodiment as viewed from the front.

[0020] Figure 12 It is a perspective view showing the first sensor substrate according to the first embodiment as viewed from the rear.

[0021] Figure 13 This is a perspective view showing the operation of the anvil according to the first embodiment as viewed from the rear.

[0022] Figure 14 This is a perspective view showing the operation of the anvil according to the first embodiment as viewed from the rear.

[0023] Figure 15 This is a perspective view showing the weight and the second sensor substrate according to the first embodiment as viewed from the rear.

[0024] Figure 16 This is a perspective view showing the weight and the second sensor substrate according to the first embodiment as viewed from the front.

[0025] Figure 17 It is a perspective view showing the second sensor substrate according to the first embodiment when viewed from the front.

[0026] Figure 18 This is a perspective view showing the operation of the hammer according to the first embodiment as viewed from the rear.

[0027] Figure 19 This is a perspective view showing the operation of the hammer according to the first embodiment as viewed from the rear.

[0028] Figure 20 It is a perspective view showing the hammer case 4 according to the first embodiment as viewed from below.

[0029] Figure 21 It is a side view showing an impact tool according to a second embodiment.

[0030] Figure 22 It is a cross-sectional view showing an impact tool according to a second embodiment.

[0031] Figure 23 It is a longitudinal sectional view showing an upper portion of an impact tool according to a second embodiment.

[0032] Figure 24 It is a perspective sectional view showing an upper portion of an impact tool according to a second embodiment.

[0033] Figure 25 It is a perspective view showing the anvil and the first sensor substrate according to the second embodiment as viewed from the rear.

[0034] Figure 26 It is a perspective view showing an anvil and a first sensor substrate according to a second embodiment as viewed from the front.

[0035] Figure 27 It is a perspective view showing a first sensor substrate according to a second embodiment when viewed from the rear.

[0036] Figure 28 It is a perspective view showing the weight and the second sensor substrate according to the second embodiment as viewed from the rear.

[0037] Figure 29 This is a perspective view showing the weight and the second sensor substrate according to the second embodiment as viewed from the front.

[0038] Figure 30 It is a perspective view showing a second sensor substrate according to the second embodiment when viewed from the front.

[0039] Figure 31 It is a perspective view showing a hammer case according to a second embodiment as viewed from below.

[0040] Figure 32 It is a side view showing an impact tool according to a third embodiment.

[0041] Figure 33 It is a cross-sectional view showing an impact tool according to a third embodiment.

[0042] Figure 34 It is a longitudinal sectional view showing an upper portion of an impact tool according to a third embodiment.

[0043] Figure 35 It is a perspective sectional view showing an upper portion of an impact tool according to a third embodiment.

[0044] Figure 36 It is a perspective view showing an anvil and a first sensor substrate according to a third embodiment as viewed from the rear.

[0045] Figure 37 It is a perspective view showing an anvil and a first sensor substrate according to a third embodiment as viewed from the front.

[0046] Figure 38 It is a perspective view showing a first sensor substrate according to a third embodiment when viewed from the rear.

[0047] Figure 39 It is a perspective view showing the weight and the second sensor substrate according to the third embodiment as viewed from the rear.

[0048] Figure 40 This is a perspective view showing a weight and a second sensor substrate according to a third embodiment as viewed from the front.

[0049] Figure 41 It is a perspective view showing a second sensor substrate according to the third embodiment when viewed from the front.

[0050] Figure 42 It is a perspective view showing a hammer case according to a third embodiment as viewed from below.

[0051] Figure 43 It is a side view showing an impact tool according to a fourth embodiment.

[0052] Figure 44 It is a cross-sectional view showing an impact tool according to a fourth embodiment.

[0053] Figure 45 It is a longitudinal sectional view showing a front portion of an impact tool according to a fourth embodiment.

[0054] Figure 46 It is a perspective sectional view showing a front portion of an impact tool according to a fourth embodiment.

[0055] Figure 47 It is a perspective view showing an anvil and a first sensor substrate according to a fourth embodiment as viewed from the rear.

[0056] Figure 48 It is a perspective view showing an anvil and a first sensor substrate according to a fourth embodiment when viewed from the front.

[0057] Figure 49 It is a perspective view showing a first sensor substrate according to a fourth embodiment when viewed from the rear.

[0058] Figure 50It is a perspective view showing a weight and a second sensor substrate according to a fourth embodiment as viewed from the rear.

[0059] Figure 51 This is a perspective view showing a weight and a second sensor substrate according to a fourth embodiment as viewed from the front.

[0060] Figure 52 It is a perspective view showing a second sensor substrate according to a fourth embodiment when viewed from the front.

[0061] Figure 53 It is a perspective view showing a hammer case according to a fourth embodiment as viewed from below.

[0062] Figure 54 It is a side view showing an impact tool according to a fifth embodiment.

[0063] Figure 55 It is a cross-sectional view showing an impact tool according to a fifth embodiment.

[0064] Figure 56 It is a longitudinal sectional view showing a front portion of an impact tool according to a fifth embodiment.

[0065] Figure 57 It is a perspective sectional view showing a front portion of an impact tool according to a fifth embodiment.

[0066] Figure 58 It is a perspective view showing an anvil and a first sensor substrate according to a fifth embodiment as viewed from the rear.

[0067] Figure 59 It is a perspective view showing an anvil and a first sensor substrate according to a fifth embodiment when viewed from the front.

[0068] Figure 60 It is a perspective view showing a first sensor substrate according to a fifth embodiment when viewed from the rear.

[0069] Figure 61 It is a perspective view showing a weight and a second sensor substrate according to a fifth embodiment as viewed from the rear.

[0070] Figure 62 It is a perspective view showing a weight and a second sensor substrate according to a fifth embodiment as viewed from the front.

[0071] Figure 63 It is a perspective view showing a second sensor substrate according to the fifth embodiment when viewed from the front.

[0072] Figure 64 It is a perspective view showing a hammer case according to a fifth embodiment as viewed from below.

[0073] Figure 65 It is a cross-sectional view showing an impact tool according to a sixth embodiment.

[0074] Figure 66 It is a cross-sectional view showing an impact tool according to a seventh embodiment.

[0075] Figure 67 It is a cross-sectional view showing an impact tool according to an eighth embodiment.

[0076] Figure 68 It is a cross-sectional view showing an impact tool according to a ninth embodiment.

[0077] Figure 69 It is a cross-sectional view showing an impact tool according to a tenth embodiment.

[0078] Figure 70 It is a cross-sectional view showing an impact tool according to an eleventh embodiment.

[0079] Figure 71 It is a perspective view showing a first sensor substrate according to a twelfth embodiment.

[0080] Description of reference numerals:

[0081] 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, 4B: Front Cylinder, 4C: Annular Portion, 4D: Hole, 4E: Groove, 4Ea: Top Surface, 4Eb: Bottom Surface, 4F: Support Surface, 4Fa: Side Support Surface, 4Fb: Front Support Surface, 4G: Space, 4R: Recessed Portion, 5: Cover, 6: Motor, 7: Speed ​​Reduction Mechanism, 8: Spindle, 8A: Flange, 8B: Spindle Shaft, 8C: Annular Portion, 8D: Spindle groove, 9: Striking mechanism, 10: Anvil (output part), 10A: Anvil shaft, 10B: Anvil protrusion, 10B1: First anvil protrusion, 10B2: Second anvil protrusion, 10C: Bit hole, 10D: Support recess, 10E: Retaining groove, 11: Switch body, 12: Fan, 12A: Bushing, 13: Battery mounting part, 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: Cylinder, 16J: Protrusion, 16K: Support surface, 17: Lamp unit, 18: Controller, 18A: Controller housing , 18B: Circuit board, 18C: Molded 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: Air intake, 20: Exhaust, 21: Motor housing, 22: Handle, 23: Battery holding portion, 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, 33: Rotor shaft, 34: Rotor magnet, 35: Sensor magnet, 37: Sensor board, 39: Rotor Sub-bearing, 40: Rotor bearing, 41: Pinion, 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: Main body, 48: Ball, 49: Coil spring, 50: Ball, 51: Buffer member, 52: Sponge, 53: Retaining ring, 54: Washer, 61: Wire, 62: Wire, 63: Wire, 80: First sensor substrate, 81: First circuit substrate, 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, 82H: First sensor, 85: First lead wire, 85C: Connector, 90: Second sensor substrate, 91: Second circuit substrate, 92: Second sensor, 92A: Second sensor, 92B: Second sensor, 95: Second lead wire, 95C: Connector, 102: Housing, 104: Hammer case, 104A: Rear cylinder, 104B: Front cylinder, 104C: Annular portion, 104D: Hole, 106: Motor, 107: Speed ​​reduction mechanism, 108: Spindle, 108F: Recess, 109: Striking mechanism, 110: Anvil, 110A: Anvil shaft, 110B: Anvil protrusion, 110B1: First anvil protrusion, 110 B2: Second anvil protrusion, 110F: Protrusion, 111: Switch body, 112: Fan, 113: Battery mounting portion, 114: Trigger lever, 115: Forward / reverse switching lever, 117: Lamp unit, 118: Controller, 118A: Controller housing, 118B: Circuit board, 118C: Molded resin, 118D: Microcomputer, 118J: Switch element, 118K: Capacitor, 118L: Resistor, 118M: Transistor, 121: Motor housing, 122: Handle, 123: Battery holding portion, 125: Battery pack, 146: Anvil bearing, 147: Hammer, 147A: Hammer groove, 147B: Hammer protrusion, 147C: Recess, 147D: Main body, 148: Ball, 149: Coil spring, 151: Buffer member, 152: Sponge, 153: Retaining ring, 154: Washer, 161: Lead wire, 162: Lead wire, 163: Lead wire, 180: First sensor substrate, 181: First circuit substrate, 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 substrate, 191: Second circuit substrate, 192: Second sensor, 192A: First sensor Second sensor, 192B: Second sensor, 195: Second wire, 195C: Connector, 202: Housing, 204: Hammer case, 204A: Rear barrel, 204B: Front barrel, 204C: Ring, 204D: Hole, 208: Spindle, 209: Striking mechanism, 210: Anvil, 210A: Anvil shaft, 210B: Anvil protrusion, 210B1: First anvil protrusion, 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, 222: Rear handle, 223: Battery holder, 224: Front handle,225: Battery pack, 247: Hammer, 247A: Hammer groove, 247B: Hammer protrusion, 247C: Recess, 247D: ​​Main body, 248: Ball, 249: Coil spring, 251: Buffer member, 252: Sponge, 246: Anvil bearing, 253: Retaining ring, 254: Washer, 261: Lead wire, 262: Lead wire, 263: Lead wire, 280: First sensor substrate, 281: First circuit substrate, 281T: Protrusion, 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 substrate, 291: Second circuit substrate, 292: Second sensor, 292A: Second sensor, 292B: Second sensor, 295: Second lead wire, 302: Housing, 304: Hammer case, 304A: Upper cylinder, 304B: Lower cylinder, 304C: Annular portion, 304D: Hole, 304E: Recess, 308: Spindle, 309: Striking mechanism, 310: Anvil, 310A: Anvil shaft, 310B: Anvil protrusion, 310B1: First anvil protrusion, 310B2: Second anvil protrusion, 313: Battery mounting portion, 314: Trigger lever, 315: Forward / reverse switching lever, 317: Lamp unit, 318 : Controller, 321: Motor housing, 322: Handle, 323: Battery holding portion, 325: Battery pack, 346: Anvil bearing, 347: Hammer, 347A: Hammer groove, 347B: Hammer protrusion, 347C: Recess, 347D: Main body, 348: Ball, 349: Coil spring, 351: Buffer member, 352: Sponge, 353: Retaining ring, 363: Lead wire, 380: First sensor substrate, 381: First circuit substrate, 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 substrate, 391: Second circuit substrate, 392: Second sensor, 392A: Second sensor, 392B: Second sensor, 395: Second lead wire, 402: Housing, 404: Hammer case, 404A: Rear cylinder, 404B: Front cylinder, 404C: Annular portion, 404D: Hole, 408: Spindle, 409: Striking mechanism, 410: Anvil, 410A: Anvil shaft, 410B: Anvil protrusion, 410B1: First anvil protrusion, 410B2: Second anvil protrusion, 413: Battery mounting portion, 414: Trigger lever, 415: Forward / reverse switching lever, 417: Lamp unit,418: Controller, 421: Motor housing, 422: Rear handle, 423: Battery holder, 424: Upper handle, 425: Battery pack, 447: Hammer, 447A: Hammer groove, 447B: Hammer protrusion, 447C: Recess, 447D: Main body, 448: Ball, 449: Coil spring, 451: Buffer member, 452: Sponge, 453: Retaining ring, 463: Lead wire, 480: First sensor substrate, 481: First circuit substrate, 481T: Protrusion, 482: First sensor, 482A: First sensor, 482B: First sensor, 482C: First sensor, 482D: First sensor, 482E: First sensor, 482F: First sensor, 4 82G: First sensor, 482H: First sensor, 485: First lead wire, 490: Second circuit substrate, 491: Second circuit substrate, 492: Second sensor, 492A: Second sensor, 492B: Second sensor, 495: Second lead wire, 504: Hammer case, 506: Motor, 507: Speed ​​reduction mechanism, 508: Spindle, 509: Striking mechanism, 510: Anvil, 514: Trigger switch, 517: Light unit, 518: Controller, 518B: Circuit substrate, 518D: Microcomputer, 518J: Switch element, 518K: Capacitor, 521: Motor housing, 522: Handle, 523: Battery holder, 537: Sensor substrate, 547: Hammer, 5 80: First sensor substrate, 585: Lead wire, 590: Second sensor substrate, 595: Lead wire, 604: Hammer housing, 606: Motor, 607: Speed ​​reduction mechanism, 608: Spindle, 609: Striking mechanism, 610: Anvil, 614: Trigger switch, 617: Lamp unit, 618: Controller, 618D: Microcomputer, 618J: Switch element, 618K: Capacitor, 621: Motor housing, 622: Handle, 623: Battery holding portion, 647: Hammer, 680: First sensor substrate, 685: Lead wire, 690: Second sensor substrate, 695: Lead wire, 704: Hammer housing, 706: Motor, 761: Lead wire, 707: Speed ​​reduction mechanism, 708: Spindle, 7 09: Striking mechanism, 710: Anvil, 714: Trigger switch, 717: Light unit, 718: Controller, 721: Motor housing, 722: Rear handle, 723: Battery holder, 747: Hammer, 780: First sensor substrate, 785: Lead wire, 790: Second sensor substrate, 795: Lead wire, 804: Hammer housing, 806: Motor, 807: Speed ​​reduction mechanism, 808: Spindle, 809: Striking mechanism, 810: Anvil, 814: Trigger switch, 817: Light unit, 818: Controller, 821: Motor housing, 822: Handle, 823: Battery holder, 837: Sensor substrate, 847: Hammer, 861: Lead wire, 862: Lead wire, 863: Lead wire,880: First sensor substrate, 885: Lead wire, 890: Second sensor substrate, 895: Lead wire, 904: Hammer housing, 906: Motor, 907: Speed ​​reduction mechanism, 908: Spindle, 909: Striking mechanism, 910: Anvil, 914: Trigger switch, 917: Light unit, 918: Controller, 921: Motor housing, 922: Rear handle, 923: Battery holder, 924: Upper handle, 947: Hammer, 963: Lead wire, 980: First sensor substrate, 985: Lead wire, 990: Second sensor substrate, 995: Lead wire, 1002: Housing, 1004: Hammer housing, 1006 : Motor, 1007: Speed ​​reduction mechanism, 1008: Spindle, 1009: Striking mechanism, 1010: Anvil, 1013: Battery mounting portion, 1014: Trigger lever, 1017: Light unit, 1018: Controller, 1025: Battery pack, 1047: Hammer, 1055: Torque switching panel, 1063: Lead wire, 1080: First sensor substrate, 1085: First lead wire, 1090: Second sensor substrate, 1095: Second lead wire, 1180: First sensor substrate, 1181: First circuit substrate, 1182: First sensor, 1185: First lead wire, AX: Rotation axis, CX: Rotation axis. DETAILED DESCRIPTION

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

[0083] (First embodiment)

[0084] Figure 1 It is a side view showing the impact tool 1A according to the embodiment. Figure 2 It is a cross-sectional view showing an impact tool 1A according to the embodiment. Figure 3 It is a longitudinal sectional view showing the upper portion of the impact tool 1A according to the embodiment. Figure 4 It is a perspective sectional view showing an upper portion of the impact tool 1A according to the embodiment.

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

[0086] In the embodiment, the impact tool 1A is an impact wrench (impact driver). The maximum tightening torque of the impact wrench 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 switching lever 15, a tool holding mechanism 16 (drill socket), a light unit 17, a first sensor substrate 80, a second sensor substrate 90, and a controller 18.

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

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

[0089] The motor housing portion 21 has a cylindrical shape and houses the motor 6 . The motor housing portion 21 houses the motor 6 , a portion of the bearing box 24 , and the rear portion of the hammer case 4 .

[0090] The handle portion 22 extends downward from the motor housing portion 21. The trigger lever 14 is provided on the upper portion of the handle portion 22. The handle portion 22 is for the operator to hold.

[0091] The battery holding portion 23 is connected to the lower end portion of the handle portion 22. In the front-back direction and the left-right direction, the outer dimensions of the battery holding portion 23 are larger than the outer dimensions of the handle portion 22.

[0092] The rear cover 3 is made of synthetic resin. It is positioned behind the motor housing 21. It houses at least a portion of the fan 12. The fan 12 is positioned on the inner circumference of the rear cover 3. The rear cover 3 covers the opening at the rear end of the motor housing 21. The rear cover 3 is secured to the rear end of the motor housing 21 with screws 3S.

[0093] The motor housing 21 has an air inlet 19. The rear cover 3 has an air outlet 20. Air outside the housing 2 flows into the interior of the housing 2 through the air inlet 19. Air inside the housing 2 flows out to the exterior of the housing 2 through the air outlet 20.

[0094] The hammer case 4 functions as a gear box that houses the speed reduction mechanism 7. The hammer case 4 houses the speed reduction mechanism 7. The hammer case 4 houses the spindle 8. The hammer case 4 houses the striking mechanism 9. The hammer case 4 also houses a portion of the anvil 10. The hammer case 4 is made of metal. In the embodiment, the hammer case 4 is made of aluminum. The hammer case 4 has a cylindrical shape.

[0095] The hammer case 4 includes a rear cylindrical portion 4A, a front cylindrical portion 4B, and an annular portion 4C. The front cylindrical portion 4B is positioned forward of the rear cylindrical portion 4A. The outer diameter of the rear cylindrical portion 4A is larger than that of the front cylindrical portion 4B. The inner diameter of the rear cylindrical portion 4A is larger than that of the front cylindrical portion 4B. The annular portion 4C is positioned to connect the front end of the rear cylindrical portion 4A with the rear end of the front cylindrical portion 4B.

[0096] The hammer case 4 is connected to the front of the motor housing portion 21. The motor housing portion 21 is fixed to the rear of the hammer case 4.

[0097] A bearing box 24 is fixed to the rear portion of the rear cylindrical portion 4A. At least a portion of the speed reduction mechanism 7 is disposed inside the bearing box 24. A portion of the bearing box 24 and the rear portion of the rear cylindrical portion 4A are housed in the motor housing 21. The bearing box 24 is fixed to both the motor housing 21 and the hammer case 4.

[0098] The cover 5 is arranged to cover the outer surface of the rear cylindrical portion 4A of the hammer case 4 .

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

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

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

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

[0103] Front insulator 29 is provided at the front of stator core 28. Rear insulator 30 is provided at the rear of stator core 28. Both front insulator 29 and rear insulator 30 are electrically insulating members made of synthetic resin. Front insulator 29 is configured to cover a portion of the surface of the teeth. Rear insulator 30 is configured to cover a portion of the surface of the teeth.

[0104] Coil 31 is attached to stator core 28 via front insulator 29 and rear insulator 30. A plurality of coils 31 are provided. Coil 31 is arranged around the teeth of stator core 28 via front insulator 29 and rear insulator 30. Coil 31 is electrically insulated from stator core 28 by front insulator 29 and rear insulator 30.

[0105] The rotor 27 rotates around the rotation axis AX and includes a rotor core 32 , a rotor shaft 33 , a rotor magnet 34 , and a sensor magnet 35 .

[0106] The rotor core 32 and the rotor shaft 33 are both made of steel. In the embodiment, the rotor core 32 and the rotor shaft 33 are integral. The front portion of the rotor shaft 33 protrudes forward from the front end of the rotor core 32. The rear portion of the rotor shaft 33 protrudes rearward from the rear end of the rotor core 32.

[0107] The rotor magnet 34 is fixed to the rotor core 32 . The rotor magnet 34 is cylindrical and is arranged around the rotor core 32 .

[0108] The sensor magnet 35 is fixed to the rotor core 32 . The sensor magnet 35 is annular and is disposed on the front end surface of the rotor core 32 and the front end surface of the rotor magnet 34 .

[0109] A sensor substrate 37 is attached to the front insulator 29. The sensor substrate 37 is secured to the front insulator 29 by screws 29S. The sensor substrate 37 includes an annular circuit board and a magnetic sensor supported by the circuit board. At least a portion of the sensor substrate 37 faces the sensor magnet 35. The magnetic sensor detects the position of the sensor magnet 35 to thereby detect the rotational position of the rotor 27.

[0110] The rear portion of the rotor shaft 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 33 is disposed within the interior space of the hammer case 4 via an opening in the bearing box 24.

[0111] A pinion gear 41 is formed at the front end portion of the rotor shaft portion 33. The pinion gear 41 is coupled to at least a portion of the speed reduction mechanism 7. The rotor shaft portion 33 is coupled to the speed reduction mechanism 7 via the pinion gear 41.

[0112] 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 includes a plurality of gears. The reduction mechanism 7 is positioned forward of the motor 6. The reduction mechanism 7 connects the rotor shaft 33 to 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 speed lower than the rotational speed of the rotor shaft 33. The reduction mechanism 7 includes a planetary gear mechanism.

[0113] The speed reduction mechanism 7 includes 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 gears 41, planetary gears 42, and internal gear 43 are housed in the hammer case 4 and the bearing housing 24, respectively. Each of the plurality of planetary gears 42 meshes with the pinion gear 41. The planetary gears 42 are rotatably supported by the main shaft 8 via pins 42P. The main shaft 8 rotates via the planetary gears 42. The internal gear 43 has internal teeth that mesh with the planetary gears 42. The internal gear 43 is fixed to the bearing housing 24. The internal gear 43 is always non-rotatable relative to the bearing housing 24.

[0114] When the rotor shaft 33 is driven by the motor 6 and rotates, the pinion 41 rotates, and the planetary gears 42 orbit around the pinion 41. The planetary gears 42 orbit while meshing with the internal teeth of the internal gear 43. Due to the orbital rotation of the planetary gears 42, the main shaft 8, which is connected to the planetary gears 42 via the pins 42P, rotates at a speed lower than the rotation speed of the rotor shaft 33.

[0115] The main shaft 8 is rotated by the rotational force of the motor 6. The main shaft 8 is arranged forward of at least a portion of the motor 6. The main shaft 8 is arranged forward of the stator 26. At least a portion of the main shaft 8 is arranged forward of the rotor 27. At least a portion of the main shaft 8 is arranged forward of the speed reduction mechanism 7. The main shaft 8 is rotated by the rotor 27. The main shaft 8 is rotated by the rotational force of the rotor 27 transmitted by the speed reduction mechanism 7.

[0116] The spindle 8 includes 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 by 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 about the rotation axis AX.

[0117] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is held by the bearing housing 24. The spindle 8 has an annular portion 8C that protrudes rearward from the rear portion of the flange portion 8A. The spindle bearing 44 is disposed inside the annular portion 8C. In the embodiment, the outer ring of the spindle bearing 44 is connected to the annular portion 8C, while the inner ring of the spindle bearing 44 is supported by the bearing housing 24.

[0118] The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the speed reduction mechanism 7 and the main shaft 8. Based on the rotational force of the main shaft 8 rotated by the motor 6, the striking mechanism 9 strikes the anvil 10 in the rotational direction. The striking mechanism 9 includes a hammer 47, a ball bearing 48, and a coil spring 49. The striking mechanism 9 including the hammer 47 is housed in the hammer case 4.

[0119] The hammer 47 is positioned forward of the speed reduction mechanism 7. It is housed in the rear cylindrical portion 4A. The hammer 47 is positioned around the spindle shaft 8B. The hammer 47 is retained by the spindle shaft 8B. A ball 48 is positioned between the spindle shaft 8B and the hammer 47. A coil spring 49 is supported by both the flange 8A and the hammer 47.

[0120] The hammer 47 has a main body 47D, a hammer groove 47A, and a hammer boss 47B (see Figure 16 The main body 47D is arranged around the spindle shaft 8B. The main body 47D is annular. A recess 47C is provided at the rear of the main body 47D. The recess 47C is recessed forward from the rear end of the main body 47D. The recess 47C is annular. The hammer boss 47B protrudes forward from the main body 47D. Two hammer bosses 47B are provided.

[0121] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the speed reduction mechanism 7 and the main shaft 8. Based on the rotational force of the main shaft 8 rotated by the motor 6, the hammer 47 can rotate together with the main shaft 8. The rotation axis of the hammer 47, the rotation axis of the main shaft 8, and the rotation axis AX of the motor 6 are aligned. The hammer 47 rotates around the rotation axis AX.

[0122] Ball 48 is made of a metal such as iron and steel. Ball 48 is positioned between spindle shaft portion 8B and hammer 47. Spindle 8 has a spindle groove 8D, in which at least a portion of ball 48 is positioned. Spindle groove 8D is provided on a portion of the outer circumferential surface of spindle shaft portion 8B. Hammer 47 has a hammer groove 47A, in which at least a portion of ball 48 is positioned. Hammer groove 47A is provided on a portion of the inner surface of main body portion 47D. Ball 48 is positioned between spindle groove 8D and hammer groove 47A. Ball 48 can roll inside spindle groove 8D and hammer groove 47A. Hammer 47 can move with ball 48. Spindle 8 and hammer 47 are capable of relative movement in the axial and rotational directions within the movable ranges defined by spindle groove 8D and hammer groove 47A.

[0123] Coil spring 49 generates a spring force that moves hammer 47 forward. Coil spring 49 is positioned between flange 8A and hammer 47. An annular recess 47C is provided on the rear surface of hammer 47. Recess 47C is recessed forward from the rear surface of hammer 47. A washer 45 is positioned inside recess 47C. Washer 45 is supported by body 47D via balls 50. The rear end of coil spring 49 is supported by flange 8A. The front end of coil spring 49 is positioned inside recess 47C and supported by washer 45.

[0124] The anvil 10 is an output portion of the impact tool 1A that is operated 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.

[0125] The anvil 10 has a rod-shaped anvil shaft portion 10A and an anvil boss portion 10B. The anvil 10 has a tool bit hole 10C for inserting a top tool (screwdriver bit). The tool bit hole 10C is provided to extend rearward from the front end portion of the anvil shaft portion 10A. The top tool is held in the tool holding mechanism 16 in a state of being inserted into the tool bit hole 10C. In addition, a recess is provided at the rear end portion of the anvil 10. A convex portion is provided at the front end portion of the spindle shaft portion 8B. The convex portion of the front end portion of the spindle shaft portion 8B is inserted into the recess provided at the rear end portion of the anvil 10. The anvil boss portion 10B is provided at the rear end portion of the anvil 10. The anvil boss portion 10B protrudes radially outward from the rear end portion of the anvil shaft portion 10A.

[0126] The anvil 10 is rotatably supported by the 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 aligned. The anvil 10 rotates around the rotation axis AX. The anvil bearing 46 is arranged on the inner side of the front cylindrical portion 4B. The anvil bearing 46 is retained by 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 supports the anvil shaft portion 10A so that it can rotate. In the embodiment, the anvil bearings 46 are arranged as a pair in the front-to-back direction.

[0127] The hammer boss 47B can contact the anvil boss 10B. When the hammer boss 47B is in contact with the anvil boss 10B, the anvil 10 rotates together with the hammer 47 and the spindle 8 by the motor 6 .

[0128] The anvil 10 is struck by the hammer 47 in the rotational direction. For example, during a screw tightening operation, if the load acting on the anvil 10 becomes high, the power generated by the motor 6 alone may not be enough to rotate the anvil 10. If the power generated by the motor 6 alone cannot rotate the anvil 10, the anvil 10 and the hammer 47 stop rotating. The spindle 8 and the hammer 47 are able to move relative to each other in both the axial and circumferential directions via the ball bearings 48. Even if the hammer 47 stops rotating, the spindle 8 can continue rotating due to the power generated by the motor 6. When the hammer 47 stops rotating, as the spindle 8 rotates, the ball bearings 48 move rearward while being guided by the spindle grooves 8D and hammer grooves 47A, respectively. The hammer 47 receives the force from the ball bearings 48 and moves rearward along with them. In other words, when the anvil 10 stops rotating, the hammer 47 moves rearward due to the rotation of the spindle 8. As the hammer 47 moves rearward, the contact between the hammer boss 47B and the anvil boss 10B is released.

[0129] The coil spring 49 generates an elastic force that moves the hammer 47 forward. The hammer 47, which is moving backward, is moved forward by the elastic force of the coil spring 49. When the hammer 47 moves forward, it receives a force in the rotational direction from the ball 48. In other words, the hammer 47 moves forward while rotating. When the hammer 47 moves forward while rotating, the hammer boss 47B contacts the anvil boss 10B while rotating. As a result, the anvil boss 10B is struck by the hammer boss 47B in the rotational direction. 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.

[0130] The fan 12 rotates by the rotational force of the motor 6. The fan 12 is arranged further rearward than the stator 26 of the motor 6. The fan 12 generates an airflow for cooling the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the rear of the rotor shaft 33 via the bushing 12A. The fan 12 is arranged between the rotor bearing 39 and the stator 26. The fan 12 rotates by the rotation of the rotor 27. The fan 12 rotates together with the rotor shaft 33 by the rotation of the rotor shaft 33. By the rotation of the fan 12, the air outside the casing 2 flows into the internal space of the casing 2 through the air inlet 19. The air flowing into the internal space of the casing 2 circulates in the internal space of the casing 2, thereby cooling the motor 6. The air circulating in the internal space of the casing 2 is rotated by the fan 12 and flows out to the outside space of the casing 2 through the exhaust port 20.

[0131] The battery mounting portion 13 is arranged at the bottom of the battery retaining portion 23. The battery pack 25 is mounted on the battery mounting portion 13. The battery pack 25 is removable relative to the battery mounting portion 13. The battery pack 25 functions as a power source for the impact tool 1A. The battery pack 25 includes a secondary battery. In an embodiment, the battery pack 25 includes a rechargeable lithium-ion battery. By mounting the battery pack 25 on the battery mounting portion 13, the battery pack 25 can supply power to the impact tool 1A. The motor 6 and the lamp unit 17 are each driven based on the power supplied from the battery pack 25.

[0132] A trigger lever 14 is mounted on the handle 22. The operator operates the trigger lever 14 to start the motor 6. A switch body 11 is disposed behind the trigger lever 14. The switch body 11 is disposed within the handle 22. Operating the trigger lever 14 activates the switch body 11. Operating the switch body 11 generates a trigger signal. Based on the trigger signal, the controller 18 switches the motor 6 between on and off mode.

[0133] The forward / reverse switching lever 15 is located above the handle 22. The operator operates the forward / reverse switching lever 15. By operating the forward / reverse switching lever 15, the rotational direction of the motor 6 is switched from one of the forward and reverse directions to the other. Switching the rotational direction of the motor 6 also switches the rotational direction of the spindle 8.

[0134] Figure 5 This is a longitudinal sectional view of a tool holding mechanism 16 according to an embodiment. The anvil 10 has a bit hole 10C for inserting a top tool (screwdriver bit). The bit hole 10C is arranged to extend rearward from the front end of the anvil shaft 10A. The top tool is held by the tool holding mechanism 16 while inserted into the bit hole 10C.

[0135] The tool holding mechanism 16 is arranged around the front portion of the anvil 10. The tool holding mechanism 16 holds the tip tool inserted into the bit hole 10C of the anvil 10. The tip tool is attachable to and detachable from the tool holding mechanism 16.

[0136] 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.

[0137] The anvil 10 has a support recess 10D that supports the ball 16A. The support recess 10D is formed on the outer peripheral surface of the anvil shaft 10A. In the embodiment, two support recesses 10D are formed on the anvil shaft 10A.

[0138] The ball 16A is movably supported by the anvil 10. The ball 16A is arranged in the support recess 10D. One ball 16A is arranged in one support recess 10D.

[0139] The anvil shaft 10A includes a through-hole connecting the inner surface of the support recess 10D and the inner surface of the cutter head hole 10C. Ball 16A, while supported by the support recess 10D, is positioned inside the cutter head hole 10C via at least a portion of the through-hole. Ball 16A secures a tool inserted into the cutter head hole 10C. Ball 16A is movable between an engaged position, which secures the tool, and a released position, which releases the tool.

[0140] The leaf spring 16B generates a spring force that moves the ball 16A toward the engagement position. The leaf spring 16B is disposed around the anvil shaft 10A. The leaf spring 16B generates a spring force that moves the ball 16A radially inward.

[0141] The sleeve 16C is a substantially cylindrical member. The sleeve 16C is disposed around the anvil shaft 10A. The sleeve 16C is axially movable around the anvil shaft 10A. The sleeve 16C is capable of preventing the balls 16A disposed in the engaged position from disengaging from the engaged position. By axially moving the sleeve 16C, the balls 16A are able to move from the engaged position to the released position.

[0142] The sleeve 16C includes a cylindrical portion 16H and a protruding portion 16J that protrudes radially inward from the inner circumference 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 facing forward.

[0143] The sleeve 16C is movable around the anvil shaft 10A between a blocking position that blocks radially outward movement of the balls 16A and a permitted position that allows radially outward movement of the balls 16A. The blocking position is positioned rearward of the permitted position. The sleeve 16C is positioned in the permitted position by moving forward.

[0144] By placing sleeve 16C in the blocking position, radially outward movement of ball 16A in the engaged position is suppressed. In other words, by placing sleeve 16C in the blocking position, ball 16A in the engaged position is prevented from disengaging. By placing sleeve 16C in the blocking position, the tip tool is maintained in a fixed position via ball 16A.

[0145] By moving the sleeve 16C to the permitted position, the balls 16A in the engaged position are permitted to move radially outward. By moving the sleeve 16C to the permitted position, the balls 16A are allowed to move from the engaged position to the released position. In other words, by placing the sleeve 16C in the permitted position, the balls 16A in the engaged position are permitted to disengage from the engaged position. By placing the sleeve 16C in the permitted position, the state in which the tip tool is secured by the balls 16A is released.

[0146] The coil spring 16D generates a spring force to move the sleeve 16C toward the blocking position. The coil spring 16D is disposed around the anvil shaft 10A. The blocking position is defined rearward of the enabling position. The coil spring 16D generates a spring force to move the sleeve 16C rearward.

[0147] The front end of coil spring 16D is supported by washer 16F. The front surface of washer 16F is supported by support ring 16G. Support ring 16G is arranged in retaining groove 10E provided at the front end of the outer peripheral surface of anvil shaft 10A. The rear end of coil spring 16D is supported by support surface 16H of sleeve 16C.

[0148] Positioning member 16E is an annular member fixed to the outer circumference of anvil shaft 10A. Positioning member 16E is fixed in a position where it can be opposite to the rear end of sleeve 16C. Positioning member 16E positions sleeve 16C in the blocking position. Sleeve 16C, which is given an elastic force by coil spring 16D and moves backward, is positioned in the blocking position by contacting positioning member 16E.

[0149] The lamp unit 17 emits illumination light. The lamp unit 17 illuminates the anvil 10 and the periphery of the anvil 10 with the illumination light. The lamp unit 17 illuminates the front end side of the anvil 10 with the illumination light. The lamp unit 17 includes chip on board light emitting diodes (COB LEDs).

[0150] The lamp unit 17 is arranged at the front portion of the hammer case 4. The lamp unit 17 is arranged around the front cylindrical portion 4B. The lamp unit 17 is arranged around the anvil shaft portion 10A via the front cylindrical portion 4B.

[0151] The controller 18 includes a computer system. The controller 18 outputs control instructions for controlling at least the motor 6 and the lamp unit 17 respectively. Figure 2 As shown, the controller 18 is housed in the battery holding portion 23 while being held in the controller case 18A. The controller 18 includes a circuit board 18B on which a plurality of electronic components are mounted, and a molded resin 18C covering the circuit board 18B.

[0152] Figure 6 1 is a block diagram showing the controller 18 according to the embodiment. Figure 2 and Figure 6 As shown, the controller 18 includes a microcomputer 18D and a control circuit 18E. The microcomputer 18D and the control circuit 18E are arranged on a circuit board 18B.

[0153] The microcomputer 18D includes a processor 18F such as a CPU (Central Processing Unit), a nonvolatile memory 18G such as a ROM (Read Only Memory) or a storage device, and a volatile memory 18H such as a RAM (Random Access Memory).

[0154] The control circuit 18E includes a plurality of electronic components. The control circuit 18E includes six switching elements 18J, a capacitor 18K, a resistor 18L, and a transistor 18M. The switching element 18J can be exemplified by a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0155] like Figure 2 、 Figure 3 ,as well as Figure 4 As shown, the motor 6 is connected to the controller 18 via a wire 61. The current from the battery pack 25 is supplied to the bus bar of the stator 26 via the controller 18 and the wire 61. The drive current supplied to the bus bar is supplied to the coil 31. The driving current supplied to the coil 31 is switched by the switching action of the switching element 18J, causing the rotor 27 to rotate. The upper end of the wire 61 is connected to the lower end of the bus bar of the stator 26, and the lower end of the wire 61 is connected to the upper surface of the controller 18. The wire 61 passes through the inside of the handle portion 22. A portion of the wire 61 passes through the rear of the switch body 11 on the inside of the handle portion 22.

[0156] The sensor substrate 37 and the controller 18 are connected via a wire 62. The detection signal from the magnetic sensor on the sensor substrate 37 is transmitted to the controller 18 via the wire 62. The microcomputer 18D in the controller 18 controls the switch element 18J based on the detection signal from the magnetic sensor. The upper end of the wire 62 is connected to the lower end of the sensor substrate 37, and the lower end of the wire 62 is connected to the top surface of the controller 18. The wire 62 passes through the inside of the handle 22. A portion of the wire 62 passes behind the switch body 11 inside the handle 22.

[0157] The lamp unit 17 and the controller 18 are connected via a wire 63. Current from the battery pack 25 is supplied to the lamp unit 17 via the controller 18 and the wire 63. By supplying current to the lamp unit 17, illumination light is emitted from the lamp unit 17. The upper end of the wire 63 is connected to the lower end of the lamp unit 17, and the lower end of the wire 63 is connected to the upper surface of the controller 18. The wire 63 passes through the inside of the motor housing 21 and the inside of the handle 22. A portion of the wire 63 passes under the hammer case 4 on the inside of the motor housing 21. Figure 3As shown, a portion of the wire 63 contacts the lower portion of the threaded projection into which the screw 2S is inserted. After passing under the buffer member 51 (described later), the wire 63 is routed along the same path as the first wire 85 and the second wire 95. A portion of the wire 63 passes behind the switch body 11 on the inner side of the handle 22.

[0158] The impact tool 1A has a first sensor substrate 80 that detects the rotation of the anvil 10 and a second sensor substrate 90 that detects the movement of the hammer 47 .

[0159] Figure 7 This is a cross-sectional view showing the upper portion of the impact tool 1A according to the embodiment, which is equivalent to the cross-sectional view taken along Figure 3 Sectional view along line AA. Figure 8 This is a cross-sectional view showing the upper portion of the impact tool 1A according to the embodiment, which is equivalent to the cross-sectional view taken along Figure 3 Cross-sectional view along line BB. Figure 9 This is a cross-sectional view showing the upper portion of the impact tool 1A according to the embodiment, which is equivalent to the cross-sectional view taken along Figure 3 Cross-sectional view along the CC line. Figure 10 It is a perspective view showing the anvil 10 and the first sensor substrate 80 according to the embodiment as viewed from the rear. Figure 11 It is a perspective view showing the anvil 10 and the first sensor substrate 80 according to the embodiment as viewed from the front. Figure 12 It is a perspective view showing the first sensor substrate 80 according to the embodiment as viewed from the rear. Figure 13 It is a perspective view showing the operation of the anvil 10 according to the embodiment as viewed from the rear. Figure 14 It is a perspective view showing the operation of the anvil 10 according to the embodiment as viewed from the rear. Figure 15 It is a perspective view showing the weight 47 and the second sensor substrate 90 according to the embodiment as viewed from the rear. Figure 16 It is a perspective view showing the weight 47 and the second sensor substrate 90 according to the embodiment as viewed from the front. Figure 17 It is a perspective view showing the second sensor substrate 90 according to the embodiment as viewed from the front. Figure 18 It is a perspective view showing the operation of the hammer 47 according to the embodiment as viewed from the rear.

[0160] Figure 19 It is a perspective view showing the operation of the hammer 47 according to the embodiment as viewed from the rear. Figure 20 It is a perspective view showing the hammer case 4 according to the embodiment as viewed from below.

[0161] The anvil 10 has a rod-shaped anvil shaft portion 10A and a pair of anvil bosses 10B extending radially outward from the rear end portion of the anvil shaft portion 10A. The anvil boss 10B includes a first anvil boss 10B1 and a second anvil boss 10B2. The first sensor substrate 80 detects the rotation of the anvil 10 about 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 rotation direction about the rotation axis AX.

[0162] The weight 47 includes an annular main body 47D, a pair of weight bosses 47B provided at the front end of the main body 47D, a weight groove 47A in which a ball 48 is disposed, and a recess 47C provided at the rear of the main body 47D. A second sensor substrate 90 detects the movement of the weight 47 in the axial direction (front-back direction). The second sensor substrate 90 detects at least one of the position, movement speed, and movement acceleration of the weight 47 in the axial direction.

[0163] The first sensor substrate 80 and the second sensor substrate 90 are each disposed inside the hammer case 4. The first sensor substrate 80 and the second sensor substrate 90 are each fixed to the hammer case 4. The first sensor substrate 80 is supported by the rear surface of the annular portion 4C of the hammer case 4. The second sensor substrate 90 is supported by the lower portion of the inner circumferential surface of the rear cylindrical portion 4A of the hammer case 4.

[0164] The first sensor substrate 80 includes a first circuit substrate 81 and a plurality of first sensors 82 mounted on the rear surface of the first circuit substrate 81 .

[0165] The first circuit substrate 81 can be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The first circuit substrate 81 is arranged at least partially around the anvil shaft portion 10A. In an embodiment, the first circuit substrate 81 is annular and arranged around the anvil shaft portion 10A. The first circuit substrate 81 has a protrusion 81T on its upper portion. The protrusion 81T protrudes upward from the upper portion of the first circuit substrate 81.

[0166] like Figure 7 As shown, a recessed portion 4R is provided on the inner circumferential surface of the rear cylindrical portion 4A of the hammer case 4, and a protrusion 81T is disposed on the recessed portion 4R. By fitting the protrusion 81T into the recessed portion, relative rotation between the hammer case 4 and the first sensor substrate 80 is suppressed. Specifically, by fitting the protrusion 81T into the recessed portion, the position of the first sensor substrate 80 relative to the hammer case 4 in the rotational direction is fixed.

[0167] like Figure 3As shown in FIG. 1 , the rear edge of the first circuit substrate 81 is supported by a retaining ring 53. The retaining ring 53 contacts the rear edge of the first circuit substrate 81. The retaining ring 53 fits into a groove provided in the inner circumferential surface of the rear cylindrical portion 4A. The retaining ring 53 prevents the first sensor substrate 80 from moving rearward. The front surface of the first circuit substrate 81 contacts the rear surface of the annular portion 4C. The retaining ring 53 secures the front-to-back position of the first sensor substrate 80 relative to the hammer case 4.

[0168] like Figure 3 As shown in the figures, a washer 54 is arranged between the front surface of the anvil boss 10B and the outer ring of the anvil bearing 46. The anvil bearing 46 is a ball bearing, and two are arranged in the front-to-back direction. The front surface of the washer 54 contacts the rear surface of the outer ring of the anvil bearing 46 on the rear side. In addition, 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 boss 10B. The washer 54 prevents the anvil boss 10B from contacting the anvil bearing 46. The washer 54 prevents the anvil bearing 46 from being damaged by the anvil boss 10B.

[0169] 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 substrate 81. The first sensor 82 is arranged at a position facing the front surface of the anvil boss 10B.

[0170] The first sensor 82 includes an inductive sensor. The anvil 10 is made of metal, and therefore, the first sensor 82 can detect the rotation of the anvil 10 in a non-contact manner. In addition, the rotation of the anvil 10 can also be renamed as the position of the anvil 10 in the rotation direction. That is, the first sensor 82 can detect the position of the anvil 10 in the rotation direction in a non-contact manner. Furthermore, the rotation of the anvil 10 can also be renamed as the rotational speed of the anvil 10. That is, the first sensor 82 can detect the rotational speed of the anvil 10 in a non-contact manner.

[0171] A plurality of first sensors 82 are provided along the circumference of the rotation axis AX. In the embodiment, eight first sensors 82 are provided at equal intervals along the circumference of the rear surface of the first circuit substrate 81. The first sensors 82 include a first sensor 82A, a first sensor 82B, a first sensor 82C, a first sensor 82D, a first sensor 82E, a first sensor 82F, a first sensor 82G, and a first sensor 82H. In the circumferential direction, when the position of the upper part of the first sensor substrate 81 is set to the 0"°" position, the position of the right part is set to the 90"°" position, the position of the lower part is set to the 180"°" position, and the position of the left part is set to the 270"°" position, the first sensor 82A is configured at the 0"°" position, the first sensor 82B is configured at the 45"°" position, the first sensor 82C is configured at the 90"°" position, the first sensor 82D is configured at the 135"°" position, the first sensor 82E is configured at the 180"°" position, the first sensor 82F is configured at the 225"°" position, the first sensor 82G is configured at the 270"°" position, and the first sensor 82H is configured at the 315"°" position.

[0172] Figure 10 This indicates a state where the first anvil boss 10B1 faces the first sensor 82A and the second anvil boss 10B2 faces the first sensor 82E. Figure 10 In the state shown, the first sensor 82A detects the first anvil boss 10B1 , and the first sensor 82E detects the second anvil boss 10B2 .

[0173] Figure 13 Is to indicate that the anvil 10 is Figure 10 The state shown is a state rotated by 45 degrees. That is, Figure 13 This indicates a state where the first anvil boss 10B1 faces the first sensor 82B and the second anvil boss 10B2 faces the first sensor 82F. Figure 13 In the state shown, the first sensor 82B detects the first anvil protrusion 10B1 , and the first sensor 82F detects the second anvil protrusion 10B2 .

[0174] Figure 14 Is to indicate that the anvil 10 is Figure 10 The state shown is a state rotated 315 degrees. That is, Figure 14 This indicates a state where the first anvil boss 10B1 faces the first sensor 82H and the second anvil boss 10B2 faces the first sensor 82D. Figure 14 In the state shown, the first sensor 82H detects the first anvil protrusion 10B1 , and the first sensor 82D detects the second anvil protrusion 10B2 .

[0175] The second sensor substrate 90 includes a second circuit substrate 91 and a plurality of second sensors 92 mounted on the upper surface of the second circuit substrate 91 .

[0176] The second circuit substrate 91 can be a printed wiring board (PWB) or a printed circuit board (PCB) mounted with a plurality of electronic components. The second circuit substrate 91 is positioned so as to face the lower portion of the outer surface of the main body 47D of the hammer 47. In the embodiment, the second circuit substrate 91 is a plate-shaped substrate that faces the lower surface of the main body 47D.

[0177] like Figure 8 As shown, a pair of slots 4E are provided at the lower portion of the rear cylindrical portion 4A of the hammer case 4, into which the side portions of the second circuit board 91 are inserted. The slots 4E are elongated in the front-to-back direction. The left portion of the second circuit board 91 fits into the left slot 4E. The right portion of the second circuit board 91 fits into the right slot 4E. The slots 4E have 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 slots 4E, the vertical position of the second sensor board 90 relative to the hammer case 4 is fixed.

[0178] like Figure 9 As shown, the groove 4E has support surfaces 4F that support the second circuit substrate 91. The support surfaces 4F include side support surfaces 4Fa that support the sides of the second circuit substrate 91 and a front support surface 4Fb that supports the front surface of the second circuit substrate 91. The side support surfaces 4Fa are provided on both the left and right sides of the second circuit substrate 91. The left side support surface 4Fa contacts the left surface of the second circuit substrate 91. The left side support surface 4Fa contacts the right surface of the second circuit substrate 91. The front support surface 4Fb contacts the front surface of the second circuit substrate 91. The rear surface of the second circuit substrate 91 contacts the lower portion of the front surface of the internal gear 43. The side support surfaces 4Fa secure the left-right position of the second sensor substrate 90 relative to the hammer case 4. The front support surface 4Fb and the internal gear 43 secure the front-back position of the second sensor substrate 90 relative to the hammer case 4. The first lead wire 85, described later, passes through the space 4G defined between the front surface of the second circuit substrate 91 and the hammer case 4.

[0179] The second sensor 92 detects the axial movement of the weight 47. The second sensor 92 is mounted on the upper surface of the second circuit board 91. The second sensor 92 is arranged at a position facing the lower surface of the main body 47D.

[0180] The second sensor 92 includes an inductive sensor. Since the hammer 47 is made of metal, the second sensor 92 can detect the movement of the hammer 47 in a non-contact manner. Furthermore, the movement of the hammer 47 can also be referred to as the position of the hammer 47 in the front-to-back direction. In other words, the second sensor 92 can detect the position of the hammer 47 in the front-to-back direction in a non-contact manner. Furthermore, the movement of the hammer 47 can also be referred to as the movement speed of the hammer 47. In other words, the second sensor 92 can detect the movement speed of the hammer 47 in a non-contact manner.

[0181] A plurality of second sensors 92 are provided along the axial direction. In the embodiment, two second sensors 92 are provided along 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 arranged further forward than the second sensor 92B.

[0182] Figure 15 This indicates a state where the hammer 47 is not facing either the second sensor 92A or the second sensor 92B. Figure 15 In the illustrated state, neither the second sensor 92A nor the second sensor 92B detects the hammer 47 .

[0183] Figure 18 It means hammer 47 from Figure 15 The state shown is a state of moving backward. Figure 18 This indicates a state where the hammer 47 faces the second sensor 92A and the hammer 47 does not face the second sensor 92B. Figure 18 In the illustrated state, the second sensor 92A detects the hammer 47 , and the second sensor 92B does not detect the hammer 47 .

[0184] Figure 19 Is to indicate that the anvil 10 is Figure 18 The state shown is a state of moving backward. Figure 19 It represents the state in which the hammer 47 is opposite to each of the second sensor 92A and the second sensor 92B. Figure 19 In the illustrated state, both the second sensor 92A and the second sensor 92B detect the hammer 47 .

[0185] The first circuit substrate 81 is connected to the controller 18 via a first wire 85. The second circuit substrate 91 is connected to the controller 18 via a second wire 95. The detection data of the first sensor 82 is transmitted to the controller 18 via the first wire 85. The detection data of the second sensor 92 is transmitted to the controller 18 via the second wire 95. The controller 18 controls the tightening torque when the impact tool 1A tightens a fastening component such as a bolt or a nut 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 by controlling the rotation speed of the motor 6 based on the detection data of the first sensor 82 and the detection data of the second sensor 92. The controller 18 estimates the current tightening torque based on the detection data of the first sensor 82 and the detection data of the second sensor 92, and controls the rotation speed of the motor 6 so that the fastening component is tightened at a target tightening torque (a predetermined tightening torque amplitude).

[0186] 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 and second wires 85, 95, respectively pass. The first and second wires 85, 95, each pass through the hole 4D to the outside of the hammer case 4, then pass through the inside of the handle 22 to connect to the controller 18. Within the handle 22, the first and second wires 85, 95 each pass behind the switch body 11.

[0187] The buffer member 51 is arranged to cover the edge of the hole 4D. The buffer member 51 is a substantially cylindrical member. The first conductive wire 85 and the second conductive wire 95 are each passed through a passage inside the buffer member 51. A sponge 52 is arranged in the passage of the buffer member 51. The sponge 52 is arranged to fill the gap between the inner circumferential surface of the buffer member 51 and the outer surface of the first conductive wire 85. The sponge 52 is arranged to fill the gap between the inner circumferential surface of the buffer member 51 and the outer surface of the second conductive wire 95. If grease (lubricant) is arranged inside the hammer case 4, the sponge 52 prevents the grease from leaking from the inside of the hammer case 4 to the outside through the passage of the buffer member 51.

[0188] The upper end of the first wire 85 is connected to the lower end of the first sensor substrate 80, and the lower end of the first wire 85 is connected to the upper surface of the controller 18. The first wire 85 extending from the lower end of the first sensor substrate 80 passes under the hammer 47 inside the hammer case 4 and passes through the reference Figure 9The first lead wire 85 extends through the space 4G in front of the second sensor substrate 90 described above and reaches below the second sensor substrate 90. The first lead wire 85, routed rearward below the second sensor substrate 90, passes through the passage of the buffer member 51 and reaches below the hammer case 4. The first lead wire 85, routed rearward below the hammer case 4, reaches the inside of the handle 22. Inside the handle 22, the first lead wire 85 passes behind the switch body 11. After passing through the passage of the buffer member 51, the first lead wire 85 follows substantially the same routing path as the lead wire 63.

[0189] The first wire 85 is separated on the inner side of the handle portion 22. Figure 2 As shown, a first lead 85 extending from the lower end of the first sensor substrate 80 is connected to a first lead 85 extending from the upper surface of the controller 18 via a connector 85C. If at least one of the first sensor substrate 80 and the controller 18 needs to be replaced, the connector 85C can be disconnected to facilitate replacement.

[0190] The upper end of the second lead wire 95 is connected to the lower surface of the second sensor substrate 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 lower surface of the second sensor substrate 90 passes through the passage of the buffer member 51 and reaches the bottom of the hammer case 4. The second lead wire 95 is routed rearward below the hammer case 4 and reaches the inside of the handle 22. Inside the handle 22, the second lead wire 95 passes behind the switch body 11. After passing through the passage of the buffer member 51, the second lead wire 95, the first lead wire 85, and the lead wire 63 follow substantially the same routing path.

[0191] The second wire 95 is separated on the inner side of the handle portion 22. Figure 2 As shown, second lead wires 95 extending from the lower surface of second sensor substrate 90 are connected to second lead wires 95 extending from the upper surface of controller 18 via connector 95C. If at least one of second sensor substrate 90 and controller 18 needs to be replaced, connector 95C can be disconnected to facilitate replacement.

[0192] As described above, in the embodiment, in the impact tool 1A as an impact wrench, the rotation of the anvil 10 is detected by the first sensor substrate 80, and the movement of the hammer 47 is detected by the second sensor substrate 90. The controller 18 can control the tightening torque based on the detection data of the first sensor 82 and the second sensor 92.

[0193] (Second embodiment)

[0194] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0195] Figure 21 It is a side view showing an impact tool 1B according to the second embodiment. Figure 22 It is a cross-sectional view showing an impact tool 1B according to a second embodiment. Figure 23 It is a longitudinal sectional view showing an upper portion of an impact tool 1B according to a second embodiment. Figure 24 It is a perspective sectional view showing an upper portion of an impact tool 1B according to a second embodiment. Figure 25 It is a perspective view showing the anvil and the first sensor substrate according to the second embodiment as viewed from the rear. Figure 26 It is a perspective view showing an anvil and a first sensor substrate according to a second embodiment as viewed from the front. Figure 27 It is a perspective view showing a first sensor substrate according to a second embodiment when viewed from the rear. Figure 28 It is a perspective view showing the weight and the second sensor substrate according to the second embodiment as viewed from the rear. Figure 29 This is a perspective view showing the weight and the second sensor substrate according to the second embodiment as viewed from the front. Figure 30 It is a perspective view showing a second sensor substrate according to the second embodiment when viewed from the front. Figure 31 It is a perspective view showing the hammer case 4 according to the second embodiment as viewed from below.

[0196] 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 reduction mechanism 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 switching lever 115, a first sensor substrate 180, a second sensor substrate 190, and a controller 118.

[0197] The housing 102 is made of synthetic resin. In the embodiment, the housing 102 is made of nylon. The housing 102 is composed of a pair of left and right half housings.

[0198] The housing 102 has a motor housing portion 121 , a handle portion 122 , and a battery holding portion 123 .

[0199] The motor housing portion 121 has a cylindrical shape and houses the motor 106 and the rear portion of the hammer case 104 .

[0200] The handle portion 122 protrudes downward from the motor housing portion 121. The trigger lever 114 is disposed on the upper portion of the handle portion 122. The handle portion 122 is for the operator to hold.

[0201] The battery holding portion 123 is connected to the lower end portion of the handle portion 122. In the front-back direction and the left-right direction, the outer dimensions of the battery holding portion 123 are larger than the outer dimensions of the handle portion 122.

[0202] The hammer case 104 functions as a gearbox that houses the speed reduction mechanism 107. The hammer case 104 houses the speed reduction mechanism 107. The hammer case 104 houses the spindle 108. The hammer case 104 houses the striking mechanism 109. The hammer case 104 also houses a portion of the anvil 110. The hammer case 104 is made of metal. In the embodiment, the hammer case 104 is made of aluminum. The hammer case 104 has a cylindrical shape.

[0203] The hammer case 104 includes a rear cylindrical portion 104A, a front cylindrical portion 104B, and an annular portion 104C. The front cylindrical portion 104B is positioned forward of the rear cylindrical portion 104A. The outer diameter of the rear cylindrical portion 104A is larger than that of the front cylindrical portion 104B. The inner diameter of the rear cylindrical portion 104A is larger than that of the front cylindrical portion 104B. The annular portion 104C is positioned to connect the front end of the rear cylindrical portion 104A to the rear end of the front cylindrical portion 104B.

[0204] The hammer case 104 is connected to the front of the motor housing 121. The motor housing 121 is fixed to the rear of the hammer case 104.

[0205] The motor 106 is a power source for the impact tool 1B. The motor 106 generates rotational force. The motor 106 is an electric motor. The motor 106 is an inner rotor type brushless motor. The motor 106 is housed in a motor housing 121 of the housing 102 .

[0206] The speed reduction mechanism 107 transmits the rotational force of the motor 106 to the spindle 108 and the anvil 110 . The speed reduction mechanism 107 is housed in the rear cylindrical portion 104A of the hammer case 104 . The speed reduction mechanism 107 includes a plurality of gears and is disposed forward of the motor 106 .

[0207] The main shaft 108 is rotated by the rotational force of the motor 106. The main shaft 108 is arranged in front of at least a portion of the motor 106. At least a portion of the main shaft 108 is arranged in front of the speed reduction mechanism 107.

[0208] The striking mechanism 109 is driven by the motor 106. The rotational force of the motor 106 is transmitted to the striking mechanism 109 via the speed reduction mechanism 107 and the main shaft 108. Based on the rotational force of the main shaft 108 rotated by the motor 106, the striking mechanism 109 strikes the anvil 110 in the rotational direction. The striking mechanism 109 includes a hammer 147, a ball bearing 148, and a coil spring 149. The striking mechanism 109 including the hammer 147 is housed in the hammer case 104.

[0209] The weight 147 is arranged forward of the speed reduction mechanism 107. The weight 147 is housed in the rear cylindrical portion 104A. The weight 147 is arranged around the main shaft 108. The weight 147 is held by the main shaft 108. The ball 148 is arranged between the main shaft 108 and the weight 147.

[0210] The hammer 147 includes a main body 147D, a hammer groove 147A, and a hammer boss 147B. The main body 147D is positioned around the spindle 108. The main body 147D is annular. A recess 147C is provided at the rear of the main body 147D. The recess 147C is recessed forward from the rear end of the main body 147D. The recess 147C is annular. The hammer boss 147B protrudes forward from the main body 147D. Two hammer bosses 147B are provided.

[0211] Hammer 147 is rotated by motor 106. The rotational force of motor 106 is transmitted to hammer 147 via speed reduction mechanism 107 and spindle 108. Hammer 147 is rotatable together with spindle 108 based on the rotational force of spindle 108 rotated by motor 106. The rotation axis of hammer 147, the rotation axis of spindle 108, and the rotation axis AX of motor 106 coincide with each other. Hammer 147 rotates about rotation axis AX.

[0212] Ball 148 is made of metal such as steel. Ball 148 is disposed between spindle 108 and hammer 147. Hammer 147 has hammer groove 147A in which at least a portion of ball 148 is disposed. Hammer groove 147A is provided on a portion of the inner surface of body 147D.

[0213] Coil spring 149 generates a spring force that moves hammer 147 forward. An annular recess 147C is provided on the rear surface of hammer 147. Recess 147C is recessed forward from the rear surface of hammer 147. The front end of coil spring 149 is disposed inside recess 147C.

[0214] The anvil 110 is an output portion of the impact tool 1B that is operated by the rotational force of the motor 106. The anvil 110 is rotated by the rotational force of the motor 106. At least a portion of the anvil 110 is disposed forward of the hammer 147.

[0215] The anvil 110 includes a rod-shaped anvil shaft portion 110A and an anvil boss portion 110B. The anvil boss portion 110B is provided at the rear end portion of the anvil 110. The anvil boss portion 110B projects radially outward from the rear end portion of the anvil shaft portion 110A.

[0216] The hammer boss 147B can contact the anvil boss 110B. When the hammer boss 147B is in contact with the anvil boss 110B, the anvil 110 is driven by the motor 106 to rotate together with the hammer 147 and the spindle 108.

[0217] The battery mounting portion 113 is disposed below the battery holding portion 123. The battery pack 125 is mounted on the battery mounting portion 113. The battery pack 125 is attachable to and detachable from the battery mounting portion 113.

[0218] A trigger lever 114 is provided on the handle 122. The operator operates the trigger lever 114 to activate the motor 106. A switch body 111 is disposed behind the trigger lever 114. The switch body 111 is disposed within the handle 122. Operating the trigger lever 114 activates the switch body 111. Operating the switch body 111 generates a trigger signal. Based on the trigger signal, the controller 118 switches between driving and stopping the motor 106.

[0219] A forward / reverse switching lever 115 is located above the handle 122. The operator operates the forward / reverse switching lever 115. By operating the forward / reverse switching lever 115, the rotational direction of the motor 106 is switched from one direction, forward or reverse, to the other. Switching the rotational direction of the motor 106 also switches the rotational direction of the spindle 108.

[0220] The controller 118 includes a computer system. The controller 118 outputs control instructions for controlling at least the motor 106 and the lamp unit 117. Figure 22 As shown, the controller 118 is housed in the battery holding portion 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 covering the circuit board 118B.

[0221] like Figure 22 As shown, the controller 118 includes a microcomputer 118D. The microcomputer 118D is disposed on a circuit board 118B.

[0222] The microcomputer 118D includes a processor such as a CPU (Central Processing Unit), a nonvolatile memory such as a ROM (Read Only Memory) or a storage device, and a volatile memory H such as a RAM (Random Access Memory).

[0223] The controller 118 includes six switching elements 118J, a capacitor 118K, a resistor 118L, and a transistor 118M. As the switching element 118J, a metal-oxide-semiconductor field-effect transistor (MOSFET) can be exemplified.

[0224] like Figure 22 、 Figure 23 ,as well as Figure 24 As shown, motor 106 is connected to controller 118 via wire 161. Current from battery pack 125 is supplied to the busbar of motor 106 via controller 118 and wire 161. The upper end of wire 161 is connected to the lower end of the busbar of motor 106, and the lower end of wire 161 is connected to the upper surface of controller 118. Wire 161 passes through the inside of handle 122. A portion of wire 161 passes behind switch body 111 inside handle 122.

[0225] A sensor substrate that detects the rotation of the rotor of motor 106 is connected to controller 118 via a wire 162. Detection signals from the sensor substrate are transmitted to controller 118 via wire 162. Microcomputer 118D in controller 118 controls switch element 118J based on the detection signals from the magnetic sensor. The upper end of wire 162 is connected to the lower end of the sensor substrate, while the lower end of wire 162 is connected to the top surface of controller 118. Wire 162 passes through the inside of handle 122. A portion of wire 162 passes behind switch body 111 inside handle 122.

[0226] The lamp unit 117 and the controller 118 are connected via a wire 163. Current from the battery pack 125 is supplied to the lamp unit 117 via the controller 118 and the wire 163. The supply of current to the lamp unit 117 causes illumination light to be emitted from the lamp unit 117. The upper end of the wire 163 is connected to the lamp unit 117, and the lower end of the wire 163 is connected to the upper surface of the controller 118. The wire 163 passes through the inside of the motor housing 121 and the inside of the handle 122. A portion of the wire 163 passes under the hammer case 104 inside the motor housing 121. After passing under the buffer member 151 (described later), the wire 163 is routed along the same path as the first wire 185 and the second wire 195. A portion of the wire 163 passes behind the switch body 111 inside the handle 122.

[0227] The impact tool 1B has a first sensor substrate 180 that detects the rotation of the anvil 110 and a second sensor substrate 190 that detects the movement of the hammer 147 .

[0228] The anvil 110 has a rod-shaped anvil shaft portion 110A and a pair of anvil bosses 110B extending radially outward from the rear end portion of the anvil shaft portion 110A. The anvil bosses 110B include a first anvil boss 110B1 and a second anvil boss 110B2. The first sensor substrate 180 detects the rotation of the anvil 110 about 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 rotation direction about the rotation axis AX.

[0229] The weight 147 includes an annular main body 147D, a pair of weight bosses 147B provided at the front end of the main body 147D, a weight groove 147A in which a ball 148 is disposed, and a recess 147C provided at the rear of the main body 147D. A second sensor substrate 190 detects the axial (front-back) movement of the weight 147. The second sensor substrate 190 detects at least one of the axial position, movement speed, and movement acceleration of the weight 147.

[0230] The first sensor substrate 180 and the second sensor substrate 190 are each disposed inside the hammer case 104. The first sensor substrate 180 and the second sensor substrate 190 are each fixed to the hammer case 104. The first sensor substrate 180 is supported by the rear surface of the annular portion 104C of the hammer case 104. The second sensor substrate 190 is supported by the lower portion of the inner circumferential surface of the rear cylindrical portion 104A of the hammer case 104.

[0231] The first sensor substrate 180 includes a first circuit substrate 181 and a plurality of first sensors 182 mounted on a rear surface of the first circuit substrate 181 .

[0232] The first circuit substrate 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 substrate 181 is disposed at least partially around the anvil shaft 110A. In an embodiment, the first circuit substrate 181 is annular and disposed around the anvil shaft 110A. The first circuit substrate 181 has a protrusion 181T on its upper portion. The protrusion 181T protrudes upward from the upper portion of the first circuit substrate 181.

[0233] As in the first embodiment, the position of the first sensor substrate 180 in the rotational direction is fixed relative to the hammer case 104 by arranging the protrusion 181T in the recess provided on the inner circumferential surface of the rear cylindrical portion 104A of the hammer case 104 .

[0234] The rear edge of the first circuit board 181 is supported by a retaining ring 153. The retaining ring 153 contacts the rear edge of the first circuit board 181. The retaining ring 153 fits into a groove provided in the inner circumferential surface of the rear cylindrical portion 104A. The retaining ring 153 prevents rearward movement of the first sensor board 180. The front surface of the first circuit board 181 contacts the rear surface of the annular portion 104C. The retaining ring 153 secures the front-to-back position of the first sensor board 180 relative to the hammer case 104.

[0235] A washer 154 is arranged between the front surface of the anvil boss 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. In addition, 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 boss 110B. The washer 154 prevents the anvil boss 110B from contacting the anvil bearing 146. The washer 154 prevents the anvil bearing 146 from being damaged by the anvil boss 110B.

[0236] 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 substrate 181. The first sensor 182 is arranged at a position facing the front surface of the anvil boss 110B.

[0237] The first sensor 182 includes an inductive sensor. The anvil 110 is made of metal, and therefore, the first sensor 182 can detect the rotation of the anvil 110 in a non-contact manner. In addition, the rotation of the anvil 110 can also be renamed as the position of the anvil 110 in the rotation direction. That is, the first sensor 182 can detect the position of the anvil 110 in the rotation direction in a non-contact manner. Furthermore, the rotation of the anvil 110 can also be renamed as the rotation speed of the anvil 110. That is, the first sensor 182 can detect the rotation speed of the anvil 110 in a non-contact manner.

[0238] A plurality of first sensors 182 are provided along the circumference of the rotation axis AX. In the embodiment, eight first sensors 182 are provided at equal intervals along the circumference of the rear surface of the first circuit substrate 181. The first sensors 182 include a first sensor 182A, a first sensor 182B, a first sensor 182C, a first sensor 182D, a first sensor 182E, a first sensor 182F, a first sensor 182G, and a first sensor 182H. In the circumferential direction, when the position of the upper part of the first sensor substrate 181 is set to the 0"°" position, the position of the right part is set to the 90"°" position, the position of the lower part is set to the 180"°" position, and the position of the left part is set to the 270"°" position, the first sensor 182A is configured at the 0"°" position, the first sensor 182B is configured at the 45"°" position, the first sensor 182C is configured at the 90"°" position, the first sensor 182D is configured at the 135"°" position, the first sensor 182E is configured at the 180"°" position, the first sensor 182F is configured at the 225"°" position, the first sensor 182G is configured at the 270"°" position, and the first sensor 182H is configured at the 315"°" position.

[0239] Figure 25This indicates a state where the first anvil protrusion 110B1 faces the first sensor 182A and the second anvil protrusion 110B2 faces the first sensor 182E. Figure 25 In the illustrated state, the first sensor 182A detects the first anvil protrusion 110B1 , and the first sensor 182E detects the second anvil protrusion 110B2 .

[0240] The anvil 110 is Figure 25 In the state shown rotated 45° with the first anvil protrusion 110B1 opposite the first sensor 182B and the second anvil protrusion 110B2 opposite 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.

[0241] The anvil 110 is Figure 25 In the state shown rotated 315° with the first anvil protrusion 110B1 opposite the first sensor 182H and the second anvil protrusion 110B2 opposite 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.

[0242] Similar to the first embodiment described above, a groove is provided in the lower portion of the hammer case 104 . The second circuit substrate 191 is disposed in the groove, and the position of the second sensor substrate 190 is fixed relative to the hammer case 104 .

[0243] The second sensor substrate 190 includes a second circuit substrate 191 and a plurality of second sensors 192 mounted on the upper surface of the second circuit substrate 191 .

[0244] Second circuit substrate 191 can be a printed wiring board (PWB) or a printed circuit board (PCB) mounted with multiple electronic components. Second circuit substrate 191 is positioned opposite the lower portion of the outer surface of main body 147D of hammer 147. In the embodiment, second circuit substrate 191 is a plate-shaped substrate that faces the lower surface of main body 147D.

[0245] The second sensor 192 detects the axial movement of the weight 147. The second sensor 192 is mounted on the upper surface of the second circuit board 191. The second sensor 192 is arranged at a position facing the lower surface of the main body 147D.

[0246] Second sensor 192 includes an inductive sensor. Since hammer 147 is made of metal, second sensor 192 can detect the movement of hammer 147 in a non-contact manner. Furthermore, the movement of hammer 147 can also be referred to as the front-to-back position of hammer 147. In other words, second sensor 192 can detect the front-to-back position of hammer 147 in a non-contact manner. Furthermore, the movement of hammer 147 can also be referred to as the movement speed of hammer 147. In other words, second sensor 192 can detect the movement speed of hammer 147 in a non-contact manner.

[0247] A plurality of second sensors 192 are provided along the axial direction. In the embodiment, two second sensors 192 are provided along the axial direction on the upper surface of the second circuit board 191. The second sensors 192 include a second sensor 192A and a second sensor 192B. The second sensor 192A is arranged forward of the second sensor 192B.

[0248] Figure 28 This indicates a state where the hammer 147 is not facing either the second sensor 192A or the second sensor 192B. Figure 28 In the illustrated state, neither the second sensor 192A nor the second sensor 192B detects the hammer 147 .

[0249] In Hammer 147 from Figure 28 In the state shown, when hammer 147 moves rearward and faces second sensor 192A but does not face second sensor 192B, second sensor 192A detects hammer 147 but second sensor 192B does not detect hammer 147 .

[0250] When hammer 147 moves further rearward and faces second sensor 192A and second sensor 192B, second sensor 192A and second sensor 192B each detect hammer 147. Alternatively, second sensor 192B may detect hammer 147, while second sensor 192A may not.

[0251] The first circuit board 181 is connected to the controller 118 via a first wire 185. The second circuit board 191 is connected to the controller 118 via a second wire 195. Detection data from the first sensor 182 is transmitted to the controller 118 via the first wire 185. Detection data from the second sensor 192 is transmitted to the controller 118 via the second wire 195. Based on the detection data from the first sensor 182 and the detection data from the second sensor 192, the controller 118 controls the tightening torque when the impact tool 1B tightens a fastening component such as a bolt or nut. The controller 118 controls the tightening torque by controlling the rotational speed of the motor 106 based on the detection data from the first sensor 182 and the detection data from the second sensor 192. The controller 118 estimates the current tightening torque based on the detection data from the first sensor 182 and the detection data from the second sensor 192, and controls the rotational speed of the motor 106 so that the fastening component is tightened at a target tightening torque (a predetermined tightening torque range).

[0252] The first circuit board 181 and the second circuit board 191 are each disposed inside the hammer case 104. The hammer case 104 has a hole 104D through which the first and second wires 185 and 195 pass. The first and second wires 185 and 195 pass through the hole 104D to the outside of the hammer case 104, then pass through the interior of the handle 122 and connect to the controller 118. Within the handle 122, the first and second wires 185 and 195 pass behind the switch body 111.

[0253] A convex portion 110F protruding rearward is provided at the rear end of the anvil 110. A concave portion 108F into which the convex portion 110F is inserted is provided at the front end of the spindle 108. The first guide wire 185 passes under the convex portion 110F and the concave portion 108F.

[0254] The buffer member 151 is arranged to cover the edge of the hole 104D. The buffer member 151 is a substantially cylindrical member. The first conductive wire 185 and the second conductive wire 195 each pass through a passage inside the buffer member 151. A sponge 152 is arranged in the passage of the buffer member 151. The sponge 152 is arranged to fill the gap between the inner circumferential surface of the buffer member 151 and the outer surface of the first conductive wire 185. The sponge 152 is arranged to fill the gap between the inner circumferential surface of the buffer member 151 and the outer surface of the second conductive wire 195. If grease (lubricant) is arranged inside the hammer case 104, the sponge 152 prevents the grease from leaking from the inside of the hammer case 104 to the outside through the passage of the buffer member 151.

[0255] The upper end of the first lead wire 185 is connected to the lower end of the first sensor substrate 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 substrate 180 passes under the hammer 147 inside the hammer case 104 and reaches below the second sensor substrate 190. The first lead wire 185, routed rearward below the second sensor substrate 190, passes through a passage in the buffer member 151 and reaches below the hammer case 104. The first lead wire 185, routed rearward below the hammer case 104, reaches the inside of the handle 122. Inside the handle 122, the first lead wire 185 passes behind the switch body 111. After passing through the passage in the buffer member 151, the first lead wire 185 follows substantially the same routing path as the lead wire 163.

[0256] The first wire 185 is separated on the inner side of the handle portion 122. Figure 22 As shown, a first lead 185 extending from the lower end of the first sensor substrate 180 is connected to a first lead 185 extending from the upper surface of the controller 118 via a connector 185C. If at least one of the first sensor substrate 180 and the controller 118 needs to be replaced, the connector 185C can be disconnected to facilitate replacement.

[0257] The upper end of the second lead wire 195 is connected to the lower surface of the second sensor substrate 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 substrate 190 passes through the passage of the buffer member 151 and reaches the bottom of the hammer case 104. The second lead wire 195 is routed rearward below the hammer case 104 and reaches the inside of the handle 122. Inside the handle 122, the second lead wire 195 passes behind the switch body 111. After passing through the passage of the buffer member 151, the second lead wire 195, the first lead wire 185, and the lead wire 163 follow substantially the same routing path.

[0258] The second wire 195 is separated on the inner side of the handle portion 122. Figure 22 As shown, second wires 195 extending from the bottom surface of second sensor substrate 190 are connected to second wires 195 extending from the top surface of controller 118 via connector 195C. If at least one of second sensor substrate 190 and controller 118 needs to be replaced, connector 195C can be disconnected to facilitate replacement.

[0259] As described above, in the embodiment, in the impact tool 1B as an impact wrench, the rotation of the anvil 110 is detected by the first sensor substrate 180, and the movement of the hammer 147 is detected by the second sensor substrate 190. The controller 118 can control the tightening torque based on the detection data of the first sensor 182 and the second sensor 192.

[0260] (Third embodiment)

[0261] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0262] Figure 32 It is a side view showing an impact tool 1C according to a third embodiment. Figure 33 It is a cross-sectional view showing an impact tool 1C according to a third embodiment. Figure 34 It is a longitudinal sectional view showing an upper portion of an impact tool 1C according to a third embodiment. Figure 35 It is a perspective sectional view showing an upper portion of an impact tool 1C according to a third embodiment. Figure 36 It is a perspective view showing an anvil and a first sensor substrate according to a third embodiment as viewed from the rear. Figure 37 It is a perspective view showing an anvil and a first sensor substrate according to a third embodiment as viewed from the front. Figure 38 It is a perspective view showing a first sensor substrate according to a third embodiment when viewed from the rear. Figure 39 It is a perspective view showing the weight and the second sensor substrate according to the third embodiment as viewed from the rear. Figure 40 This is a perspective view showing a weight and a second sensor substrate according to a third embodiment as viewed from the front. Figure 41 It is a perspective view showing a second sensor substrate according to the third embodiment when viewed from the front. Figure 42 It is a perspective view showing the hammer case 4 according to the third embodiment as viewed from below.

[0263] In the 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 switching lever 215 , a first sensor substrate 280 , a second sensor substrate 290 , and a controller 218 .

[0264] The housing 202 has a motor housing portion 221 , a rear handle portion 222 , a battery holding portion 223 , and a front handle portion 224 .

[0265] The motor housing 221 is cylindrical. The rear handle 222 extends downward from the motor housing 221. The trigger lever 214 is located above the rear handle 222. The handle 122 is for the operator to grasp. The front handle 224 is positioned further forward than the rear handle 222. The battery holder 223 is connected to the lower ends of the rear handle 222 and the lower ends of the front handle 224.

[0266] The hammer case 204 includes a rear cylindrical portion 204A, a front cylindrical portion 204B, and an annular portion 204C. The front cylindrical portion 204B is positioned forward of the rear cylindrical portion 204A. The outer diameter of the rear cylindrical portion 204A is larger than that of the front cylindrical portion 204B. The inner diameter of the rear cylindrical portion 204A is larger than that of the front cylindrical portion 204B. The annular portion 204C is positioned to connect the front end of the rear cylindrical portion 204A to the rear end of the front cylindrical portion 204B.

[0267] The hammer case 204 is connected to the front of the motor housing portion 221 . The motor housing portion 221 is fixed to the rear of the hammer case 204 .

[0268] The main shaft 208 is rotated by the rotational force of a motor (not shown).

[0269] The striking mechanism 209 includes a hammer 247 , a ball 248 , and a coil spring 249 . The striking mechanism 209 including the hammer 247 is housed in the hammer case 204 .

[0270] The hammer 247 includes a main body 247D, a hammer groove 247A, and a hammer boss 247B. The main body 247D is positioned around the spindle 208. The main body 247D is annular. A recess 247C is provided at the rear of the main body 247D. The recess 247C is recessed forward from the rear end of the main body 247D. The recess 247C is annular. The hammer boss 247B protrudes forward from the main body 247D. Two hammer bosses 247B are provided.

[0271] The anvil 210 includes a rod-shaped anvil shaft portion 210A and an anvil boss portion 210B. The anvil boss portion 210B is provided at the rear end portion of the anvil 210. The anvil boss portion 210B projects radially outward from the rear end portion of the anvil shaft portion 210A.

[0272] The battery mounting portion 213 is disposed below the battery holding portion 223. The battery pack 225 is mounted on the battery mounting portion 213. The battery pack 225 is attachable to and detachable from the battery mounting portion 213.

[0273] The trigger lever 214 is provided on the rear handle portion 222. A switch body 211 is disposed behind the trigger lever 214. The switch body 211 is disposed inside the handle portion 122. Operating the trigger lever 214 operates the switch body 211. Operating the switch body 211 generates a trigger signal.

[0274] The forward / reverse switching lever 215 is provided on the upper portion of the rear handle portion 222. The forward / reverse switching lever 215 is operated by the operator.

[0275] The impact tool 1C has a first sensor substrate 280 that detects the rotation of the anvil 210 and a second sensor substrate 290 that detects the movement of the hammer 247 .

[0276] The anvil 210 includes a rod-shaped anvil shaft portion 210A and a pair of anvil bosses 210B extending radially outward from the rear end portion of the anvil shaft portion 210A. 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.

[0277] The weight 247 includes an annular main body 247D, a pair of weight bosses 247B provided at the front end of the main body 247D, a weight groove 247A in which a ball 248 is disposed, and a recess 247C provided at the rear of the main body 247D. A second sensor substrate 290 detects axial (front-back) movement of the weight 247. The second sensor substrate 290 detects at least one of the position, movement speed, and movement acceleration of the weight 247 in the axial direction.

[0278] The motor is connected to the controller 218 via a wire 261. Current from the battery pack 225 is supplied to the motor via the controller 218 and the wire 261. The upper end of the wire 261 is connected to the lower end of the motor, and the lower end of the wire 261 is connected to the upper surface of the controller 218. The wire 261 passes through the inside of the rear handle 222. A portion of the wire 261 passes behind the switch body 211 inside the rear handle 222.

[0279] A sensor substrate that detects the rotation of the motor's rotor is connected to controller 218 via wire 262. Detection signals from the sensor substrate are transmitted to controller 218 via wire 262. Controller 218 controls the motor based on the detection signals from the magnetic sensor. The upper end of wire 262 is connected to the lower end of the sensor substrate, while the lower end of wire 262 is connected to the top surface of controller 218. Wire 262 passes through the inside of rear handle 222. A portion of wire 262 passes behind switch body 211 inside rear handle 222.

[0280] The lamp unit 217 and the controller 218 are connected via a wire 263. Current from the battery pack 225 is supplied to the lamp unit 217 via the controller 218 and the wire 263. The supply of current to the lamp unit 217 causes illumination light to be emitted from the lamp unit 217. The upper end of the wire 263 is connected to the lower end of the lamp unit 217, and the lower end of the wire 263 is connected to the upper surface of the controller 218. The wire 263 passes through the inside of the rear handle 222. A portion of the wire 263 passes under the hammer case 204. After passing under the buffer member 251 (described later), the wire 263 is routed along the same path as the first wire 285 and the second wire 295. A portion of the wire 263 passes behind the switch body 211 on the inside of the rear handle 222.

[0281] The first sensor substrate 280 and the second sensor substrate 290 are each disposed inside the hammer case 204. The first sensor substrate 280 and the second sensor substrate 290 are each fixed to the hammer case 204. The first sensor substrate 280 is supported by the rear surface of the annular portion 204C of the hammer case 204. The second sensor substrate 290 is supported by the lower portion of the inner circumferential surface of the rear cylindrical portion 204A of the hammer case 204.

[0282] The anvil 210 has a rod-shaped anvil shaft portion 210A and a pair of anvil bosses 210B extending radially outward from the rear end portion of the anvil shaft portion 210A. The anvil bosses 210B include a first anvil boss 210B1 and a second anvil boss 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 rotation direction about the rotation axis AX.

[0283] The first sensor substrate 280 includes a first circuit substrate 281 and a plurality of first sensors 282 mounted on the rear surface of the first circuit substrate 281 .

[0284] The first circuit substrate 281 can be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The first circuit substrate 281 is disposed at least partially around the anvil shaft 210A. In an embodiment, the first circuit substrate 281 is annular and disposed around the anvil shaft 210A. The first circuit substrate 281 has a protrusion 281T on its upper portion. The protrusion 281T protrudes upward from the upper portion of the first circuit substrate 281.

[0285] As in the first embodiment described above, the position of the first sensor substrate 280 in the rotational direction is fixed relative to the hammer case 204 by arranging the convex portion 281T in the concave portion provided on the inner peripheral surface of the hammer case 204 .

[0286] The rear edge of the first circuit board 281 is supported by a retaining ring 253. The retaining ring 253 contacts the rear edge of the first circuit board 281. The retaining ring 253 fits into a groove provided on the inner circumference of the rear cylindrical portion 204A. The retaining ring 253 prevents rearward movement of the first sensor board 280. The front surface of the first circuit board 281 contacts the rear surface of the annular portion 204C. The retaining ring 253 secures the front-to-back position of the first sensor board 280 relative to the hammer case 204.

[0287] A washer 254 is arranged between the front surface of the anvil boss 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. In addition, a portion of the front surface of the washer 254 also contacts the rear surface of the annular portion 204C. The rear surface of the washer 254 contacts the front surface of the anvil boss 210B. The washer 254 prevents the anvil boss 210B from contacting the anvil bearing 246. The washer 254 prevents the anvil bearing 246 from being damaged by the anvil boss 210B.

[0288] 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 substrate 281. The first sensor 282 is arranged at a position facing the front surface of the anvil boss 210B.

[0289] The first sensor 282 includes an inductive sensor. The anvil 210 is made of metal, and therefore, the first sensor 282 can detect the rotation of the anvil 210 in a non-contact manner. In addition, the rotation of the anvil 210 can also be renamed as the position of the anvil 210 in the rotation direction. That is, the first sensor 282 can detect the position of the anvil 210 in the rotation direction in a non-contact manner. Furthermore, the rotation of the anvil 210 can also be renamed as the rotation speed of the anvil 210. That is, the first sensor 282 can detect the rotation speed of the anvil 210 in a non-contact manner.

[0290] A plurality of first sensors 282 are provided along the circumference of the rotation axis AX. In the embodiment, eight first sensors 282 are provided at equal intervals along the circumference of the rear surface of the first circuit substrate 281. The first sensors 282 include a first sensor 282A, a first sensor 282B, a first sensor 282C, a first sensor 282D, a first sensor 282E, a first sensor 282F, a first sensor 282G, and a first sensor 282H. In the circumferential direction, when the position of the upper part of the first sensor substrate 281 is set to the 0"°" position, the position of the right part is set to the 90"°" position, the position of the lower part is set to the 180"°" position, and the position of the left part is set to the 270"°" position, the first sensor 282A is configured at the 0"°" position, the first sensor 282B is configured at the 45"°" position, the first sensor 282C is configured at the 90"°" position, the first sensor 282D is configured at the 135"°" position, the first sensor 282E is configured at the 180"°" position, the first sensor 282F is configured at the 225"°" position, the first sensor 282G is configured at the 270"°" position, and the first sensor 282H is configured at the 315"°" position.

[0291] The anvil 210 is Figure 36 In the state shown rotated 45° with the first anvil protrusion 210B1 opposite the first sensor 282B and the second anvil protrusion 210B2 opposite 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.

[0292] The anvil 210 is Figure 36 In the state shown rotated 315° with the first anvil protrusion 210B1 opposite the first sensor 282H and the second anvil protrusion 210B2 opposite 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.

[0293] Similar to the first embodiment described above, a groove is provided in the lower portion of the hammer case 204 . The second circuit substrate 291 is disposed in the groove, and the position of the second sensor substrate 290 is fixed relative to the hammer case 204 .

[0294] The second sensor substrate 290 includes a second circuit substrate 291 and a plurality of second sensors 292 mounted on the upper surface of the second circuit substrate 291 .

[0295] The second circuit substrate 291 can be a printed wiring board (PWB) or a printed circuit board (PCB) mounted with a plurality of electronic components. The second circuit substrate 291 is disposed opposite the lower portion of the outer surface of the main body 247D of the hammer 247. In the embodiment, the second circuit substrate 291 is in the form of a plate that faces the lower surface of the main body 247D.

[0296] The second sensor 292 detects the axial movement of the weight 247. The second sensor 292 is mounted on the upper surface of the second circuit board 291. The second sensor 292 is arranged at a position facing the lower surface of the main body 247D.

[0297] The second sensor 292 includes an inductive sensor. Since the hammer 247 is made of metal, the second sensor 292 can detect the movement of the hammer 247 in a non-contact manner. Furthermore, the movement of the hammer 247 can also be referred to as the front-to-back position of the hammer 247. In other words, the second sensor 292 can detect the front-to-back position of the hammer 247 in a non-contact manner. Furthermore, the movement of the hammer 247 can also be referred to as the movement speed of the hammer 247. In other words, the second sensor 292 can detect the movement speed of the hammer 247 in a non-contact manner.

[0298] A plurality of second sensors 292 are provided along the axial direction. In the embodiment, two second sensors 292 are provided along the axial direction on the upper surface of the second circuit board 291. The second sensors 292 include a second sensor 292A and a second sensor 292B. The second sensor 292A is arranged further forward than the second sensor 292B.

[0299] Figure 39 This indicates a state where the hammer 247 is not facing either the second sensor 292A or the second sensor 292B. Figure 39 In the illustrated state, neither the second sensor 292A nor the second sensor 292B detects the hammer 247 .

[0300] In Hammer 247 from Figure 39 In the state shown, when hammer 247 moves backward and faces second sensor 292A but does not face second sensor 292B, second sensor 292A detects hammer 247 but second sensor 292B does not detect hammer 247 .

[0301] When hammer 247 moves further rearward and faces second sensor 292A and second sensor 292B, second sensor 292A and second sensor 292B each detect hammer 247. Alternatively, second sensor 292B may detect hammer 247, while second sensor 292A may not.

[0302] The first circuit board 281 is connected to the controller 218 via a first wire 285. The second circuit board 291 is connected to the controller 218 via a second wire 295. Detection data from the first sensor 282 is transmitted to the controller 218 via the first wire 285. Detection data from the second sensor 292 is transmitted to the controller 218 via the second wire 295. Based on the detection data from the first sensor 282 and the detection data from the second sensor 292, the controller 218 controls the tightening torque when the impact tool 1C tightens a fastening component such as a bolt or nut. The controller 218 controls the tightening torque by controlling the motor speed based on the detection data from the first sensor 282 and the detection data from the second sensor 292. The controller 218 estimates the current tightening torque based on the detection data from the first sensor 282 and the detection data from the second sensor 292, and controls the motor speed so that the fastening component is tightened at a target tightening torque (a predetermined tightening torque range).

[0303] The first circuit board 281 and the second circuit board 291 are each disposed inside the hammer case 204. The hammer case 204 has a hole 204D through which the first and second wires 285 and 295 pass. The first and second wires 285 and 295 pass through the hole 204D to the outside of the hammer case 204, then pass through the interior of the rear handle 222 and connect to the controller 218. Within the rear handle 222, the first and second wires 285 and 295 pass behind the switch body 211.

[0304] The buffer member 251 is arranged to cover the edge of the hole 204D. The buffer member 251 is a substantially cylindrical member. The first conductive wire 285 and the second conductive wire 295 each pass through a passage inside the buffer member 251. A sponge 252 is arranged in the passage of the buffer member 251. The sponge 252 is arranged to fill the gap between the inner circumferential surface of the buffer member 251 and the outer surface of the first conductive wire 285. The sponge 252 is arranged to fill the gap between the inner circumferential surface of the buffer member 251 and the outer surface of the second conductive wire 295. If grease (lubricant) is arranged inside the hammer case 204, the sponge 252 prevents the grease from leaking from the inside of the hammer case 204 to the outside through the passage of the buffer member 251.

[0305] The upper end of the first lead wire 285 is connected to the lower end of the first sensor substrate 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 substrate 280 passes under the hammer 247 inside the hammer case 204 and reaches below the second sensor substrate 290. The first lead wire 285, routed rearward below the second sensor substrate 290, passes through a passage in the buffer 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 handle 222. Inside the rear handle 222, the first lead wire 285 passes behind the switch body 211. After passing through the passage in the buffer member 251, the first lead wire 285 follows substantially the same routing path as the lead wire 263.

[0306] The upper end of the second lead wire 295 is connected to the lower surface of the second sensor substrate 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 substrate 290 passes through the passage of the buffer member 251 and reaches the bottom of the hammer case 204. The second lead wire 295 is routed rearward below the hammer case 204 and reaches the inside of the rear handle 222. Inside the rear handle 222, the second lead wire 295 passes behind the switch body 211. After passing through the passage of the buffer member 251, the second lead wire 295, the first lead wire 285, and the lead wire 263 follow substantially the same routing path.

[0307] As described above, in the embodiment, in the impact tool 1C as an impact wrench, the rotation of the anvil 210 is detected by the first sensor substrate 280, and the movement of the hammer 247 is detected by the second sensor substrate 290. The controller 218 controls the tightening torque based on the detection data of the first sensor 282 and the second sensor 292.

[0308] (Fourth embodiment)

[0309] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0310] Figure 43 It is a side view showing an impact tool according to a fourth embodiment. Figure 44 It is a cross-sectional view showing an impact tool according to a fourth embodiment. Figure 45 It is a longitudinal sectional view showing a front portion of an impact tool according to a fourth embodiment. Figure 46 It is a perspective sectional view showing a front portion of an impact tool according to a fourth embodiment. Figure 47It is a perspective view showing an anvil and a first sensor substrate according to a fourth embodiment as viewed from the rear. Figure 48 It is a perspective view showing an anvil and a first sensor substrate according to a fourth embodiment when viewed from the front. Figure 49 It is a perspective view showing a first sensor substrate according to a fourth embodiment when viewed from the rear. Figure 50 It is a perspective view showing a weight and a second sensor substrate according to a fourth embodiment as viewed from the rear. Figure 51 This is a perspective view showing a weight and a second sensor substrate according to a fourth embodiment as viewed from the front. Figure 52 It is a perspective view showing a second sensor substrate according to a fourth embodiment when viewed from the front. Figure 53 It is a perspective view showing a hammer case 4 according to a fourth embodiment as viewed from below.

[0311] In the embodiment, the impact tool 1D is an angled 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 switching lever 315 , a first sensor substrate 380 , a second sensor substrate 390 , and a controller 318 .

[0312] The housing 302 has a motor housing portion 321 , a handle portion 322 , and a battery holding portion 323 .

[0313] The motor housing 321 is cylindrical. A handle 322 extends rearward from the motor housing 321. The handle 322 extends in the front-to-back direction. The motor housing 321 is connected to the handle 322. The trigger lever 314 is located below the handle 322. The handle 322 is for the operator to grasp. The battery holder 323 is connected to the rear end of the handle 322.

[0314] 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 below the upper cylindrical portion 304A. The outer diameter of the upper cylindrical portion 304A is larger than that of the lower cylindrical portion 304B. The inner diameter of the upper cylindrical portion 304A is larger than that of the lower cylindrical portion 304B. The annular portion 304C connects the lower end of the upper cylindrical portion 304A to the upper end of the lower cylindrical portion 304B.

[0315] The hammer case 304 is connected to the front of the motor housing 321 . The motor housing 321 is fixed to the rear of the hammer case 304 .

[0316] The main shaft 308 is rotated by the rotational force of a motor (not shown). The rotation axis AX of the motor extends in the front-rear direction.

[0317] The striking mechanism 309 includes a hammer 347 , a ball 348 , and a coil spring 349 . The striking mechanism 309 including the hammer 347 is housed in the hammer case 304 .

[0318] The hammer 347 includes a main body 347D, a hammer groove 347A, and a hammer boss 347B. The main body 347D is positioned around the spindle 308. The main body 347D is annular. A recess 347C is provided on the upper portion of the main body 347D. The recess 347C is recessed downward from the upper end of the main body 347D. The recess 347C is annular. The hammer boss 347B protrudes downward from the main body 347D. Two hammer bosses 347B are provided.

[0319] The anvil 310 includes a rod-shaped anvil shaft portion 310A and an anvil boss portion 310B. The anvil boss portion 310B is provided at the upper end portion of the anvil 310. The anvil boss portion 310B protrudes radially outward from the upper end portion of the anvil shaft portion 310A. The anvil 310 is struck by the hammer 347 in the rotational direction.

[0320] 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) is orthogonal to the rotation axis CX of the anvil 310.

[0321] The battery mounting portion 313 is disposed below the battery holding portion 323. The battery pack 325 is mounted on the battery mounting portion 313. The battery pack 325 is attachable to and detachable from the battery mounting portion 313.

[0322] The impact tool 1D has a first sensor substrate 380 that detects the rotation of the anvil 310 and a second sensor substrate 390 that detects the movement of the hammer 347 .

[0323] The anvil 310 includes 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 the 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.

[0324] The weight 347 includes an annular main body 347D, a pair of weight bosses 347B provided at the lower end of the main body 347D, a weight groove 347A in which a ball 348 is disposed, and a recess 347C provided at the rear of the main body 347D. A second sensor substrate 390 detects axial (vertical) movement of the weight 347. The second sensor substrate 390 detects at least one of the axial position, movement speed, and movement acceleration of the weight 347.

[0325] The first sensor substrate 380 and the second sensor substrate 390 are each disposed inside the hammer case 304. The first sensor substrate 380 and the second sensor substrate 390 are each fixed to the hammer case 304. The first sensor substrate 380 is supported on the upper surface of the annular portion 304C of the hammer case 304. The second sensor substrate 390 is supported on the rear portion of the upper cylindrical portion 304A of the hammer case 304.

[0326] The lamp unit 317 and the controller 318 are connected via a wire 363. Current from the battery pack 325 is supplied to the lamp unit 317 via the controller 318 and the wire 363. The supply of current to the lamp unit 317 causes illumination light to be emitted from the lamp unit 317. The front end of the wire 363 is connected to the lamp unit 317, and the rear end of the wire 363 is connected to the upper surface of the controller 318. The wire 363 passes through the inside of the handle 322. A portion of the wire 363 passes under the hammer case 304. After passing under the buffer member 351 (described later), the wire 363 is routed along the same path as the first wire 385 and the second wire 395.

[0327] The anvil 310 has a rod-shaped anvil shaft portion 310A and a pair of anvil bosses 310B extending radially outward from the upper end portion of the anvil shaft portion 310A. The anvil bosses 310B include a first anvil boss 310B1 and a second anvil boss 310B2. The first sensor substrate 380 detects the 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 rotation direction about the rotation axis CX.

[0328] The first sensor substrate 380 includes a first circuit substrate 381 and a plurality of first sensors 382 mounted on the rear surface of the first circuit substrate 381 .

[0329] The first circuit substrate 381 can be a printed wiring board (PWB) or a printed circuit board (PCB) on which a plurality of electronic components are mounted. The first circuit substrate 381 is arranged at least partially around the anvil shaft portion 310A. In an embodiment, the first circuit substrate 381 is annular and arranged around the anvil shaft portion 310A. The first sensor substrate 380 is arranged in a recess 304E provided on the upper surface of the annular portion 304C. The first circuit substrate 381 has a protrusion 381T at the front. The protrusion 381T protrudes forward from the front of the first circuit substrate 381. The position of the first sensor substrate 380 in the rotational direction is fixed relative to the hammer case 304 by the protrusion 381T.

[0330] The upper edge of the first circuit board 381 is supported by a retaining ring 353. The retaining ring 353 contacts the upper edge of the first circuit board 381. The retaining ring 353 fits into a groove provided in the inner circumference of the hammer case 304. The retaining ring 353 prevents the first sensor board 380 from moving upward. The lower surface of the first circuit board 381 contacts the upper surface of the annular portion 304C. The retaining ring 353 fixes the vertical position of the first sensor board 380 relative to the hammer case 304.

[0331] The anvil bearing 346 is a sliding bearing made of oil-impregnated metal. The upper end of the anvil bearing 346 is positioned above the first circuit board 381. Since the upper end of the anvil bearing 346 is positioned above the upper surface of the first circuit board 381, contact between the anvil boss 310B and the first circuit board 381 is suppressed.

[0332] The first sensor 382 detects the rotation of the anvil 310. The first sensor 382 is mounted on the upper surface of the first circuit substrate 381. The first sensor 382 is arranged at a position facing the lower surface of the anvil boss 310B.

[0333] The first sensor 382 includes an inductive sensor. The anvil 310 is made of metal, and therefore, the first sensor 382 can detect the rotation of the anvil 310 in a non-contact manner. In addition, the rotation of the anvil 310 can also be renamed as the position of the anvil 310 in the rotation direction. That is, the first sensor 382 can detect the position of the anvil 310 in the rotation direction in a non-contact manner. Furthermore, the rotation of the anvil 310 can also be renamed as the rotation speed of the anvil 310. That is, the first sensor 382 can detect the rotation speed of the anvil 310 in a non-contact manner.

[0334] A plurality of first sensors 382 are provided along the circumference of the rotation axis CX. In the embodiment, eight first sensors 382 are provided at equal intervals along the circumference of the upper surface of the first circuit substrate 381. The first sensors 382 include a first sensor 382A, a first sensor 382B, a first sensor 382C, a first sensor 382D, a first sensor 382E, a first sensor 382F, a first sensor 382G, and a first sensor 382H. In the circumferential direction, when the front position of the first sensor substrate 381 is set to the 0"°" position, the right position is set to the 90"°" position, the rear position is set to the 180"°" position, and the left position is set to the 270"°" position, the first sensor 382A is configured at the 0"°" position, the first sensor 382B is configured at the 45"°" position, the first sensor 382C is configured at the 90"°" position, the first sensor 382D is configured at the 135"°" position, the first sensor 382E is configured at the 180"°" position, the first sensor 382F is configured at the 225"°" position, the first sensor 382G is configured at the 270"°" position, and the first sensor 382H is configured at the 315"°" position.

[0335] Figure 47 This indicates a state where the first anvil protrusion 310B1 faces the first sensor 382A and the second anvil protrusion 310B2 faces the first sensor 382E. Figure 47 In the illustrated state, the first sensor 382A detects the first anvil protrusion 310B1 and the first sensor 382E detects the second anvil protrusion 310B2.

[0336] The anvil 310 is Figure 47 In the state shown rotated 45° with the first anvil protrusion 310B1 opposite the first sensor 382B and the second anvil protrusion 310B2 opposite 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.

[0337] The anvil 310 is Figure 47 In the state shown rotated 315° with the first anvil protrusion 310B1 opposite the first sensor 382H and the second anvil protrusion 310B2 opposite 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.

[0338] The second sensor substrate 390 includes a second circuit substrate 391 and a plurality of second sensors 392 mounted on the upper surface of the second circuit substrate 391 .

[0339] The second circuit substrate 391 can be a printed wiring board (PWB) or a printed circuit board (PCB) mounted with a plurality of electronic components. The second circuit substrate 391 is positioned opposite the rear portion of the outer surface of the main body 347D of the hammer 347. In the embodiment, the second circuit substrate 391 is a plate-shaped substrate that faces the rear surface of the main body 347D.

[0340] The second sensor 392 detects the axial movement of the weight 347. The second sensor 392 is mounted on the front surface of the second circuit board 391. The second sensor 392 is arranged at a position facing the rear surface of the main body 347D.

[0341] Second sensor 392 includes an inductive sensor. Since hammer 347 is made of metal, second sensor 392 can detect the movement of hammer 347 in a non-contact manner. Furthermore, the movement of hammer 347 can also be referred to as the vertical position of hammer 347. In other words, second sensor 392 can detect the vertical position of hammer 347 in a non-contact manner. Furthermore, the movement of hammer 347 can also be referred to as the movement speed of hammer 347. In other words, second sensor 392 can detect the movement speed of hammer 347 in a non-contact manner.

[0342] A plurality of second sensors 392 are provided along the axial direction. In the embodiment, two second sensors 392 are provided along the axial direction on the front surface of the second circuit board 391. The second sensors 392 include a second sensor 392A and a second sensor 392B. The second sensor 392A is arranged below the second sensor 392B.

[0343] In a state where the hammer 347 is not facing either the second sensor 392A or the second sensor 392B, the hammer 347 is not detected by the second sensor 392A or the second sensor 392B.

[0344] In a state where the hammer 347 faces the second sensor 392A and the hammer 347 does not face the second sensor 392B, the second sensor 392A detects the hammer 347 and the second sensor 392B does not detect the hammer 347 .

[0345] When hammer 347 faces both second sensor 392A and second sensor 392B, second sensor 392A and second sensor 392B both detect hammer 347. Alternatively, second sensor 392B may detect hammer 347, while second sensor 392A may not.

[0346] The first circuit board 381 is connected to the controller 318 via a first wire 385. The second circuit board 391 is connected to the controller 318 via a second wire 395. Detection data from the first sensor 382 is transmitted to the controller 318 via the first wire 385. Detection data from the second sensor 392 is transmitted to the controller 318 via the second wire 395. Based on the detection data from the first sensor 382 and the detection data from the second sensor 392, the controller 318 controls the tightening torque when the impact tool 1D tightens a fastening component such as a bolt or nut. The controller 318 controls the tightening torque by controlling the motor speed based on the detection data from the first sensor 382 and the detection data from the second sensor 392. The controller 318 estimates the current tightening torque based on the detection data from the first sensor 382 and the detection data from the second sensor 392, and controls the motor speed so that the fastening component is tightened at a target tightening torque (a predetermined tightening torque range).

[0347] The first circuit board 381 and the second circuit board 391 are each disposed inside the hammer case 304. The hammer case 304 has a hole 304D through which the first and second wires 385 and 395 pass. The first and second wires 385 and 395 pass through the hole 304D to the outside of the hammer case 304, then pass through the interior of the handle 322 and connect to the controller 318.

[0348] The buffer member 351 is arranged to cover the edge of the hole 304D. The buffer member 351 is a substantially cylindrical member. The first conductive wire 385 and the second conductive wire 395 each pass through a passage inside the buffer member 351. A sponge 352 is arranged in the passage of the buffer member 351. The sponge 352 is arranged to fill the gap between the inner circumferential surface of the buffer member 351 and the outer surface of the first conductive wire 385. The sponge 352 is arranged to fill the gap between the inner circumferential surface of the buffer member 351 and the outer surface of the second conductive wire 395. If grease (lubricant) is arranged inside the hammer case 304, the sponge 352 prevents the grease from leaking from the inside of the hammer case 304 to the outside through the passage of the buffer member 351.

[0349] The front end of the first lead wire 385 is connected to the first sensor substrate 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 substrate 380 is routed rearward inside the hammer case 304, then passes through the passage of the buffer member 351 and reaches below the hammer case 304. The first lead wire 385 routed rearward below the hammer case 304 reaches the inside of the handle 322. After passing through the passage of the buffer member 351, the first lead wire 385 follows substantially the same routing path as the lead wire 363.

[0350] The front end of the second lead wire 395 is connected to the lower end of the second sensor substrate 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 substrate 390 passes through the passage of the buffer member 351 and reaches the bottom of the hammer case 304. The second lead wire 395 is routed rearward below the hammer case 304 and reaches the inside of the handle portion 322. After passing through the passage of the buffer member 351, the second lead wire 395, the first lead wire 385, and the lead wire 263 have substantially the same routing path.

[0351] As described above, in the embodiment, in the impact tool 1D as an impact wrench, the rotation of the anvil 310 is detected by the first sensor substrate 380, and the movement of the hammer 347 is detected by the second sensor substrate 390. The controller 318 can control the tightening torque based on the detection data of the first sensor 382 and the second sensor 392.

[0352] (Fifth embodiment)

[0353] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0354] Figure 54 It is a side view showing an impact tool according to a fifth embodiment. Figure 55 It is a cross-sectional view showing an impact tool according to a fifth embodiment. Figure 56 It is a longitudinal sectional view showing a front portion of an impact tool according to a fifth embodiment. Figure 57 It is a perspective sectional view showing a front portion of an impact tool according to a fifth embodiment. Figure 58 It is a perspective view showing an anvil and a first sensor substrate according to a fifth embodiment as viewed from the rear. Figure 59 It is a perspective view showing an anvil and a first sensor substrate according to a fifth embodiment when viewed from the front. Figure 60 It is a perspective view showing a first sensor substrate according to a fifth embodiment when viewed from the rear. Figure 61 It is a perspective view showing a weight and a second sensor substrate according to a fifth embodiment as viewed from the rear. Figure 62 It is a perspective view showing a weight and a second sensor substrate according to a fifth embodiment as viewed from the front. Figure 63 It is a perspective view showing a second sensor substrate according to the fifth embodiment when viewed from the front. Figure 64 It is a perspective view showing a hammer case according to a fifth embodiment as viewed from below.

[0355] In the embodiment, the impact tool 1E is an 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 switching lever 415 , a first sensor substrate 480 , a second sensor substrate 490 , and a controller 418 .

[0356] The housing 402 has a motor housing portion 421 , a rear handle portion 422 , a battery holding portion 423 , and an upper handle portion 424 .

[0357] The motor housing 421 is cylindrical. A rear handle 422 is located behind the motor housing 421. A trigger lever 414 is located in front of the rear handle 422. The rear handle 422 is intended for the operator to grasp. An upper handle 424 connects the upper portion of the rear handle 422 to the motor housing 421. A battery holder 423 is connected to the lower end of the rear handle 422.

[0358] The hammer case 404 includes a rear cylindrical portion 404A, a front cylindrical portion 404B, and an annular portion 404C. The front cylindrical portion 404B is positioned forward of the rear cylindrical portion 404A. The outer diameter of the rear cylindrical portion 404A is larger than that of the front cylindrical portion 404B. The inner diameter of the rear cylindrical portion 404A is larger than that of the front cylindrical portion 404B. The annular portion 404C is positioned to connect the front end of the rear cylindrical portion 404A to the rear end of the front cylindrical portion 404B.

[0359] The hammer case 404 is connected to the front of the motor housing 421. The motor housing 421 is fixed to the rear of the hammer case 404.

[0360] The main shaft 408 is rotated by the rotational force of a motor (not shown). The rotation axis AX of the motor extends in the front-rear direction.

[0361] The striking mechanism 409 includes a hammer 447 , a ball 448 , and a coil spring 449 . The striking mechanism 409 including the hammer 447 is housed in the hammer case 404 .

[0362] The hammer 447 includes a main body 447D, a hammer groove 447A, and a hammer projection 447B. The main body 447D is positioned around the main shaft 408. The main body 447D is annular. A recess 447C is provided at the rear of the main body 447D. The recess 447C is recessed forward from the rear end of the main body 447D. The recess 447C is annular. The hammer projection 447B protrudes forward from the main body 447D. Two hammer projections 447B are provided.

[0363] The anvil 410 includes a rod-shaped anvil shaft portion 410A and an anvil boss portion 410B. The anvil boss portion 410B is provided at the rear end portion of the anvil 410. The anvil boss portion 410B projects radially outward from the rear end portion of the anvil shaft portion 410A.

[0364] The battery mounting portion 413 is disposed below the battery holding portion 423. The battery pack 425 is mounted on the battery mounting portion 413. The battery pack 425 is attachable to and detachable from the battery mounting portion 413.

[0365] The impact tool 1E has a first sensor substrate 480 that detects the rotation of the anvil 410 and a second sensor substrate 490 that detects the movement of the hammer 447 .

[0366] The anvil 410 includes 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. A first sensor substrate 480 detects the 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.

[0367] The weight 447 includes an annular main body 447D, a pair of weight bosses 447B provided at the lower end of the main body 447D, a weight groove 447A in which a ball 448 is disposed, and a recess 447C provided at the rear of the main body 447D. A second sensor substrate 490 detects axial (vertical) movement of the weight 447. The second sensor substrate 490 detects at least one of the axial position, movement speed, and movement acceleration of the weight 447.

[0368] The first sensor substrate 480 and the second sensor substrate 490 are each disposed inside the hammer case 404. The first sensor substrate 480 and the second sensor substrate 490 are each fixed to the hammer case 404. The first sensor substrate 480 is supported on the upper surface of the annular portion 404C of the hammer case 404. The second sensor substrate 490 is supported on the rear portion of the rear cylindrical portion 404A of the hammer case 404.

[0369] The lamp unit 417 is connected to the controller 418 via a wire 463. Current from the battery pack 425 is supplied to the lamp unit 417 via the controller 418 and the wire 463. The supply of current to the lamp unit 417 causes illumination light to be emitted from the lamp unit 417. The front end of the wire 463 is connected to the lamp unit 417, and the rear end of the wire 463 is connected to the upper surface of the controller 418. The wire 463 passes through the lower portion of the inner side of the motor housing 421. A portion of the wire 463 passes under the hammer case 404. After passing under the buffer member 451 (described later), the wire 463 is routed along the same path as the first wire 485 and the second wire 495.

[0370] The anvil 410 has a rod-shaped anvil shaft portion 410A and a pair of anvil bosses 410B extending radially outward from the rear end portion of the anvil shaft portion 410A. The anvil bosses 410B include a first anvil boss 410B1 and a second anvil boss 410B2. The first sensor substrate 480 detects the 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 rotation direction about the rotation axis AX.

[0371] The first sensor substrate 480 includes a first circuit substrate 481 and a plurality of first sensors 482 mounted on the rear surface of the first circuit substrate 481 .

[0372] The first circuit substrate 481 can be a printed wiring board (PWB) or a printed circuit board (PCB) mounted with a plurality of electronic components. The first circuit substrate 481 is disposed at least partially around the anvil shaft 410A. In an embodiment, the first circuit substrate 481 is annular and disposed around the anvil shaft 410A. The first circuit substrate 481 has a protrusion 481T on its upper portion. The protrusion 481T protrudes upward from the upper portion of the first circuit substrate 481. The protrusion 481T secures the position of the first sensor substrate 480 relative to the hammer case 404 in the rotational direction.

[0373] The rear edge of the first circuit board 481 is supported by a retaining ring 453. The retaining ring 453 contacts the rear edge of the first circuit board 481. The retaining ring 453 fits into a groove provided on the inner circumference 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 secures the front-to-back position of the first sensor board 480 relative to the hammer case 404.

[0374] The first sensor 482 detects the rotation of the anvil 410. The first sensor 482 is mounted on the rear surface of the first circuit substrate 481. The first sensor 482 is arranged at a position facing the front surface of the anvil boss 410B.

[0375] The first sensor 482 includes an inductive sensor. The anvil 410 is made of metal, and therefore, the first sensor 482 can detect the rotation of the anvil 410 in a non-contact manner. In addition, the rotation of the anvil 410 can also be renamed as the position of the anvil 410 in the rotation direction. That is, the first sensor 482 can detect the position of the anvil 410 in the rotation direction in a non-contact manner. Furthermore, the rotation of the anvil 410 can also be renamed as the rotation speed of the anvil 410. That is, the first sensor 482 can detect the rotation speed of the anvil 410 in a non-contact manner.

[0376] A plurality of first sensors 482 are provided along the circumference. In the embodiment, eight first sensors 482 are provided at equal intervals along the circumference on the rear surface of the first circuit substrate 481. The first sensors 482 include a first sensor 482A, a first sensor 482B, a first sensor 482C, a first sensor 482D, a first sensor 482E, a first sensor 482F, a first sensor 482G, and a first sensor 482H. In the circumferential direction, when the position of the upper part of the first sensor substrate 81 is set to the 0"°" position, the position of the right part is set to the 90"°" position, the position of the lower part is set to the 180"°" position, and the position of the left part is set to the 270"°" position, the first sensor 482A is configured at the 0"°" position, the first sensor 482B is configured at the 45"°" position, the first sensor 482C is configured at the 90"°" position, the first sensor 482D is configured at the 135"°" position, the first sensor 482E is configured at the 180"°" position, the first sensor 482F is configured at the 225"°" position, the first sensor 482G is configured at the 270"°" position, and the first sensor 482H is configured at the 315"°" position.

[0377] Figure 58 This indicates a state where the first anvil protrusion 410B1 faces the first sensor 482A and the second anvil protrusion 410B2 faces the first sensor 482E. Figure 58 In the illustrated state, the first sensor 482A detects the first anvil protrusion 410B1 and the first sensor 482E detects the second anvil protrusion 410B2.

[0378] The anvil 410 is Figure 58 In the state shown rotated 45° with the first anvil protrusion 410B1 opposite the first sensor 482B and the second anvil protrusion 410B2 opposite 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.

[0379] The anvil 410 is Figure 58In the state shown rotated 315° with the first anvil protrusion 410B1 opposite the first sensor 482H and the second anvil protrusion 410B2 opposite 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.

[0380] The second sensor substrate 490 includes a second circuit substrate 491 and a plurality of second sensors 492 mounted on the upper surface of the second circuit substrate 491 .

[0381] The second circuit substrate 491 can be a printed wiring board (PWB) or a printed circuit board (PCB) mounted with a plurality of electronic components. The second circuit substrate 491 is positioned opposite the rear portion of the outer surface of the main body 447D of the hammer 447. In the embodiment, the second circuit substrate 491 is a plate-shaped substrate that faces the rear surface of the main body 447D.

[0382] The second sensor 492 detects the axial movement of the weight 447. The second sensor 492 is mounted on the upper surface of the second circuit board 491. The second sensor 492 is arranged at a position facing the lower surface of the main body 447D.

[0383] Second sensor 492 includes an inductive sensor. Since hammer 447 is made of metal, second sensor 492 can detect the movement of hammer 447 in a non-contact manner. Furthermore, the term "movement of hammer 447" can also be referred to as the front-to-back position of hammer 447. In other words, second sensor 492 can detect the front-to-back position of hammer 447 in a non-contact manner. Furthermore, the term "movement of hammer 447" can also be referred to as the movement speed of hammer 447. In other words, second sensor 492 can detect the movement speed of hammer 447 in a non-contact manner.

[0384] A plurality of second sensors 492 are provided along the axial direction. In the embodiment, two second sensors 492 are provided along the axial direction on the upper surface of the second circuit substrate 491. The second sensors 492 include a second sensor 492A and a second sensor 492B. The second sensor 492A is arranged further forward than the second sensor 492B.

[0385] Figure 61 This indicates a state where the hammer 447 is not facing the second sensor 492A or the second sensor 492B. Figure 61 In the illustrated state, neither the second sensor 492A nor the second sensor 492B detects the hammer 447 .

[0386] In Hammer 447 from Figure 61In the state shown, when hammer 447 moves backward and faces second sensor 492A but does not face second sensor 492B, second sensor 492A detects hammer 447 but second sensor 492B does not detect hammer 447 .

[0387] When hammer 447 moves further rearward and faces second sensor 492A and second sensor 492B, second sensor 492A and second sensor 492B detect hammer 447. Alternatively, second sensor 492B may detect hammer 447, while second sensor 492A may not.

[0388] The first circuit board 481 is connected to the controller 418 via a first wire 485. The second circuit board 491 is connected to the controller 418 via a second wire 495. Detection data from the first sensor 482 is transmitted to the controller 418 via the first wire 485. Detection data from the second sensor 492 is transmitted to the controller 418 via the second wire 495. Based on the detection data from the first sensor 482 and the detection data from the second sensor 492, the controller 418 controls the tightening torque when the impact tool 1E tightens a fastening component such as a bolt or nut. The controller 418 controls the tightening torque by controlling the motor speed based on the detection data from the first sensor 482 and the detection data from the second sensor 492. The controller 418 estimates the current tightening torque based on the detection data from the first sensor 482 and the detection data from the second sensor 492, and controls the motor speed so that the fastening component is tightened at a target tightening torque (a predetermined tightening torque range).

[0389] The first circuit board 481 and the second circuit board 491 are each disposed inside the hammer case 404. The hammer case 404 has a hole 404D through which the first and second wires 485 and 495 pass. The first and second wires 485 and 495 pass through the hole 404D to the outside of the hammer case 404 and are then connected to the controller 418.

[0390] The buffer member 451 is arranged to cover the edge of the hole 404D. The buffer member 451 is a substantially cylindrical member. The first conductive wire 485 and the second conductive wire 495 each pass through a passage inside the buffer member 451. A sponge 452 is arranged in the passage of the buffer member 451. The sponge 452 is arranged to fill the gap between the inner circumferential surface of the buffer member 451 and the outer surface of the first conductive wire 485. The sponge 452 is arranged to fill the gap between the inner circumferential surface of the buffer member 451 and the outer surface of the second conductive wire 495. If grease (lubricant) is arranged inside the hammer case 404, the sponge 452 prevents the grease from leaking from the inside of the hammer case 404 to the outside through the passage of the buffer member 451.

[0391] The front end of the first lead wire 485 is connected to the first sensor substrate 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 substrate 480 passes under the hammer 447 inside the hammer case 404 and reaches below the second sensor substrate 490. The first lead wire 485, routed rearward below the second sensor substrate 490, passes through a passage in the buffer member 451 and reaches below the hammer case 404. The first lead wire 485, routed rearward below the hammer case 404, passes through the inside of the motor housing 421 and reaches the controller 418. The routing path of the first lead wire 485, after passing through the passage in the buffer member 451, is substantially the same as that of the lead wire 463.

[0392] The front end of the second lead wire 495 is connected to the lower surface of the second sensor substrate 490, and the rear end of the second lead wire 495 is connected to the upper surface of the controller 418. The second lead wire 495 extending from the second sensor substrate 490 passes through the passage of the buffer member 451 and reaches the bottom of the hammer case 404. The second lead wire 495, which is routed rearward below the hammer case 404, passes through the inside of the motor housing 421 and reaches the controller 418. After passing through the passage of the buffer member 451, the second lead wire 495, the first lead wire 485, and the lead wire 463 have substantially the same routing path.

[0393] As described above, in the embodiment, in the impact tool 1E as an impact wrench, the rotation of the anvil 410 is detected by the first sensor substrate 480, and the movement of the hammer 447 is detected by the second sensor substrate 490. The controller 418 can control the tightening torque based on the detection data of the first sensor 482 and the second sensor 492.

[0394] (Sixth embodiment)

[0395] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0396] Figure 65This is a cross-sectional view of an impact tool 1F according to a sixth embodiment. The impact tool 1F is an impact wrench as disclosed in U.S. Patent Application Publication No. 2023 / 0256580. The impact tool 1F includes a hammer housing 504, a motor 506, a sensor substrate 537 for detecting the 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 lamp unit 517, a controller 518, a motor housing 521, a handle 522, a battery holder 523, and a hammer 547. The impact tool 1F can be provided with a first sensor substrate 580 and a second sensor substrate 590.

[0397] The lamp unit 517 is connected to the controller 518 via a wire 563. The first sensor substrate 580 is connected to the controller 518 via a wire 585. The second sensor substrate 590 is connected to the controller 518 via a wire 595. The controller 518 includes a circuit substrate 518B, a microcomputer 518D mounted on the circuit substrate 518B, six switching elements 518J, and a capacitor 518K.

[0398] (Seventh embodiment)

[0399] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0400] Figure 66 This is a cross-sectional view of an impact tool 1G according to a seventh embodiment. The impact tool 1G is an impact wrench as disclosed in U.S. Patent Application Publication No. 2023 / 0302611. The impact tool 1G includes a hammer case 604, a motor 606, a speed reduction mechanism 607, a spindle 608, a striking mechanism 609, an anvil 610, a trigger switch 614, a motor housing 621, a handle 622, a battery holder 623, and a hammer 647. The impact tool 1G may also be provided with a first sensor substrate 680 and a second sensor substrate 690.

[0401] The lamp unit 617 is connected to the controller 618 via a wire 663. The first sensor substrate 680 is connected to the controller 618 via a wire 685. The second sensor substrate 690 is connected to the controller 618 via a wire 695. The controller 618 includes a microcomputer 618D and six switching elements 618J.

[0402] (Eighth Embodiment)

[0403] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0404] Figure 67 This is a cross-sectional view of an impact tool 1H according to an eighth embodiment. The impact tool 1H is an impact wrench as disclosed in U.S. Patent Application Publication No. 2022 / 0274246. The impact tool 1H includes a hammer housing 704, a motor 706, a speed reduction mechanism 707, a spindle 708, a striking mechanism 709, an anvil 710, a trigger switch 714, a motor housing 721, a handle 722, a battery holder 723, and a hammer 747. The impact tool 1H may also be provided with a first sensor substrate 780 and a second sensor substrate 790.

[0405] The lamp unit 717 is connected to the controller 718 via a wire 763. The first sensor substrate 780 is connected to the controller 718 via a wire 785. The second sensor substrate 790 is connected to the controller 718 via a wire 761. The motor 706 is connected to the controller 718 via a wire 795.

[0406] (Ninth embodiment)

[0407] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0408] Figure 68 1 is a cross-sectional view of 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. 4260984. The impact tool 1I includes a hammer housing 804, a motor 806, a speed reduction mechanism 807, a spindle 808, a striking mechanism 809, an anvil 810, a trigger switch 814, a controller 818, a motor housing 821, a handle 822, a battery retaining portion 823, and a hammer 847. The controller 818 is disposed on the handle 822. A first sensor substrate 880 and a second sensor substrate 890 may also be provided in the impact tool 1I.

[0409] The motor 806 is connected to the controller 818 via a wire 861. The sensor substrate 837 that detects the rotation of the rotor of the motor 806 is connected to the controller 818 via a wire 862. The lamp unit 817 is connected to the controller 818 via a wire 863. The first sensor substrate 880 is connected to the controller 818 via a wire 885. The second sensor substrate 890 is connected to the controller 818 via a wire 895.

[0410] (Tenth embodiment)

[0411] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0412] Figure 69 This is a cross-sectional view of an impact tool 1J according to a tenth embodiment. The impact tool 1J is an impact wrench as disclosed in U.S. Patent Application Publication No. 2023 / 0253855. The impact tool 1J includes a hammer housing 904, a motor 906, a speed reduction 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 handle 922, a battery holder 923, an upper handle 924, and a hammer 947. The impact tool 1J may also be provided with a first sensor substrate 980 and a second sensor substrate 990.

[0413] The lamp unit 917 is connected to the controller 918 via a wire 963. The first sensor substrate 980 is connected to the controller 918 via a wire 985. The second sensor substrate 990 is connected to the controller 918 via a wire 995. The wire 985 extends forward from the front surface of the first sensor substrate 980, passes through a through-hole provided in the hammer case 904, is pulled forward of the hammer case 904, and then is pulled rearward from the bottom of the hammer case 904. A sponge may be placed in the through-hole of the hammer case 904 to prevent grease leakage.

[0414] (Eleventh embodiment)

[0415] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0416] Figure 70 This is a cross-sectional view of an impact tool 1K according to an eleventh embodiment. The impact tool 1K is an angled impact wrench. The impact tool 1K includes a housing 1002, a hammer case 1004, a motor 1006, a speed reduction 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 substrate 1080 and a second sensor substrate 1090. A first lead wire 1085 is connected to the first sensor substrate 1080, and a second lead wire 1095 is connected to the second sensor substrate 1090. The battery mounting portion 1013 is located at the rear of the housing 1002, and the torque switching panel 1055 is located at the top of the housing 1002. The battery pack 1025 is mounted in the battery mounting portion 1013.

[0417] The lamp unit 1017 is connected to the controller 1018 via a wire 1063. The first sensor substrate 1080 is connected to the controller 1018 via a wire 1085. The second sensor substrate 1090 is connected to the controller 1018 via a wire 1095.

[0418] (Twelfth embodiment)

[0419] In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of the components will be simplified or omitted.

[0420] Figure 71 11 is a perspective view showing a first sensor substrate 1180 according to the twelfth embodiment. The first sensor substrate 1180 includes a first circuit substrate 1181 and a first sensor 1182. A first lead 1185 is connected to the first circuit substrate 1181. Figure 71 As shown, the first circuit substrate 1181 may not be in a circular shape, but may be in an arc shape.

Claims

1. An impact tool, wherein: have: shell; a motor housed in the housing; a hammer rotated by the motor; an anvil struck by the hammer in a rotational direction; a hammer housing for accommodating the hammer; a first sensor to detect rotation of the anvil; a second sensor to detect movement of the hammer; as well as a controller that controls a tightening torque based on detection data of the first sensor and the second sensor; The anvil has a tool head hole for inserting a top tool.

2. The impact tool according to claim 1, wherein The housing has: a motor housing portion for housing the motor; a handle portion extending downward from the motor accommodating portion; as well as The battery holding portion is connected to the lower end portion of the handle portion.

3. An impact tool, wherein: have: shell; a motor housed in the housing; a hammer rotated by the motor; an anvil struck by the hammer in a rotational direction; a hammer housing for accommodating the hammer; a first sensor to detect rotation of the anvil; a second sensor to detect movement of the hammer; as well as a controller that controls the tightening torque based on detection data of the first sensor and the second sensor, The housing has: a motor housing portion for housing the motor; a rear handle portion extending downward from the motor accommodating portion; a front handle portion, disposed further forward than the rear handle portion; as well as The battery holding portion is connected to the lower end portion of the rear handle portion and the lower end portion of the front handle portion.

4. An impact tool, wherein: have: A handle portion extending in the front-to-back direction; a housing connected to the handle; a motor housed in the housing; a hammer rotated by the motor; an anvil, struck by the hammer in a rotational direction and extending in an up-down direction; a hammer housing for accommodating the hammer; a first sensor to detect rotation of the anvil; a second sensor to detect movement of the hammer; as well as A controller controls the tightening torque based on detection data of the first sensor and the second sensor.

5. An impact tool, wherein: have: shell; a motor housed in the housing; a hammer rotated by the motor; an anvil struck by the hammer in a rotational direction; a hammer housing for accommodating the hammer; a first sensor to detect rotation of the anvil; a second sensor to detect movement of the hammer; as well as a controller that controls the tightening torque based on detection data of the first sensor and the second sensor, The housing has: a motor housing portion for housing the motor; a rear handle portion, disposed behind the motor accommodating portion; an upper handle portion, connecting an upper portion of the rear handle portion to the motor accommodating portion; as well as The battery holding portion is connected to the lower end portion of the rear handle portion.

6. The impact tool according to any one of claims 1 to 5, wherein The first sensor is mounted on the first circuit substrate; The second sensor is mounted on the second circuit substrate; The impact tool has: a first wire connecting the first circuit substrate to the controller; The second wire connects the second circuit substrate to the controller.

7. The impact tool according to claim 6, wherein The first circuit substrate and the second circuit substrate are respectively arranged inside the hammer case, and the hammer case has a hole through which the first lead wire and the second lead wire pass.

8. The impact tool according to claim 6, wherein The anvil has an anvil shaft portion and an anvil protrusion portion, The first circuit substrate is arranged at least partially around the anvil shaft portion. The first sensor is arranged at a position opposite to the anvil protrusion.

9. The impact tool according to claim 6, wherein The second circuit substrate is in the shape of a plate facing the outer surface of the hammer. The second sensor is arranged at a position facing the outer surface of the hammer.

Images