Impact wrench

Abstract

To increase torque of an anvil of an impact wrench.SOLUTION: An impact wrench comprises: a brushless motor having a stator and a rotor rotating with respect to the stator; a striking mechanism rotated by the rotor; an anvil struck by the striking mechanism; and a battery installation part on which a battery pack is installed. A maximum fastening torque of the anvil is 3200 Nm or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art In the technical field related to impact wrenches, there is known an impact wrench that is driven by power supplied from a battery pack, as disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-509182 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in this specification aims to increase the torque of the anvil of an impact wrench. [Means for solving the problem]

[0005] This specification discloses an impact wrench. The impact wrench may include a brushless motor having a stator and a rotor that rotates relative to the stator, a striking mechanism rotated by the rotor, an anvil struck by the striking mechanism, and a battery mounting portion to which a battery pack is attached. The maximum tightening torque of the anvil may be 3200 Nm or more. Effect of the Invention

[0006] According to the technology disclosed in this specification, the anvil of the impact wrench has a high torque. [Brief description of the drawings]

[0007] [Figure 1]FIG. 1 is a front view showing an impact wrench according to a first embodiment. [Diagram 2] FIG. 2 is a top view showing the impact wrench according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing a part of the impact wrench according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating a stator according to the first embodiment. [Diagram 5] FIG. 5 is a diagram illustrating a schematic view of the anvil according to the first embodiment. [Figure 6] FIG. 6 is a front view showing an impact wrench according to the second embodiment. [Figure 7] FIG. 7 is a top view showing the impact wrench according to the third embodiment. [Figure 8] FIG. 8 is a top view showing the impact wrench according to the fourth embodiment. [Figure 9] FIG. 9 is a side view showing the impact wrench according to the fifth embodiment. [Figure 10] FIG. 10 is a top view showing the impact wrench according to the sixth embodiment. [Figure 11] FIG. 11 is a side view showing an impact wrench according to the seventh embodiment. [Figure 12] FIG. 12 is a front view showing an impact wrench according to the eighth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In one or more embodiments, the impact wrench may include a brushless motor having a stator and a rotor that rotates relative to the stator, a striking mechanism rotated by the rotor, an anvil struck by the striking mechanism, and a battery mounting portion to which a battery pack is attached. The maximum tightening torque of the anvil may be 3200 Nm or more.

[0009] In the above configuration, the anvil of the impact wrench has a high torque.

[0010] In one or more embodiments, the sum of the rated voltages of the battery packs may be 36V or more. The outer diameter of the stator may be 50mm or more. The maximum output of the brushless motor may be 1250W or more. The rotation speed of the anvil may be 600 rpm or more and 2400 rpm or less. The impact speed of the impact mechanism may be 900 rpm or more and 3200 rpm or less. The weight of the hammer of the impact mechanism may be 0.55 kg or more and 2.2 kg or less. The reduction ratio of the reduction mechanism may be 1 / 60 or more and 1 / 15 or less. The distance between first and second sides of the opposing tips of the anvils may be 1 inch or more and 2.5 inches or less.

[0011] With the above configuration, the maximum tightening torque of the anvil can be increased to 3200 Nm or more. The maximum tightening torque is the torque when the fastened material is tightened, and generally refers to the torque measured with a torque wrench for tightening the fastened material after tightening. Note that this is not a method of measuring by loosening the nuts or bolts. Generally, this maximum tightening torque is listed in the catalog of each manufacturer.

[0012] In one or more embodiments, the impact wrench may include a brushless motor having a stator and a rotor that rotates relative to the stator, a striking mechanism rotated by the rotor, an anvil struck by the striking mechanism, and a battery mounting portion to which a battery pack is attached. The maximum tightening torque of the anvil may be 6000 Nm or more.

[0013] In the above configuration, the anvil of the impact wrench has a high torque.

[0014] In one or more embodiments, the sum of the rated voltages of the battery packs may be 72V or more. The outer diameter of the stator may be 60mm or more. The maximum output of the brushless motor may be 2500W or more. The rotation speed of the anvil may be 600 rpm or more and 2400 rpm or less. The impact speed of the impact mechanism may be 900 rpm or more and 3200 rpm or less. The weight of the hammer of the impact mechanism may be 1.1 kg or more and 4.4 kg or less. The reduction ratio of the reduction mechanism may be 1 / 60 or more and 1 / 15 or less. The distance between first and second sides of the opposing tips of the anvils may be 1 inch or more and 2.5 inches or less.

[0015] With the above configuration, the maximum tightening torque of the anvil can be set to 6000 Nm or more.

[0016] In one or more embodiments, the impact wrench may include a brushless motor having a stator and a rotor that rotates relative to the stator, a striking mechanism rotated by the rotor, an anvil struck by the striking mechanism, and a battery mounting portion to which a battery pack is attached. The maximum tightening torque of the anvil may be 10,000 Nm or more.

[0017] In the above configuration, the anvil of the impact wrench has a high torque.

[0018] In one or more embodiments, the sum of the rated voltages of the battery packs may be 144V or more. The outer diameter of the stator may be 60mm or more. The maximum output of the brushless motor may be 5000W or more. The rotation speed of the anvil may be 600 rpm or more and 2400 rpm or less. The impact rate of the impact mechanism may be 900 rpm or more and 3200 rpm or less. The weight of the hammer of the impact mechanism may be 2.2 kg or more and 3.8 kg or less. The reduction ratio of the reduction mechanism may be 1 / 60 or more and 1 / 15 or less. The distance between first and second sides of the opposing tips of the anvils may be 1 inch or more and 2.5 inches or less.

[0019] With the above configuration, the maximum tightening torque of the anvil can be made 10,000 Nm or more.

[0020] In one or more embodiments, the battery capacity of the battery pack may be 5 Ah or greater.

[0021] In one or more embodiments, the current supplied to the brushless motor may be less than or equal to 80 A. The current supplied to the brushless motor may be greater than or equal to 40 A and less than or equal to 60 A.

[0022] In one or more embodiments, the energy of a single impact by the impact mechanism may be 95 J or more.

[0023] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment. The components of the embodiments described below can be appropriately combined. In addition, some components may not be used.

[0024] In the embodiment, the positional relationship of each part will be described using the terms "left", "right", "front", "rear", "upper", and "lower". These terms indicate relative positions or directions based on the center of the impact wrench. The left-right direction, the front-rear direction, and the up-down direction are perpendicular to each other.

[0025] In the embodiment, 1 Nm, which is a unit of torque, can be converted to 0.7376 ft·lb, and 1 [ft·lb] can be converted to 1.36 [Nm].

[0026] [First embodiment] A first embodiment will be described.

[0027] <Impact wrench> Fig. 1 is a front view showing an impact wrench 1A according to a first embodiment. Fig. 2 is a top view showing the impact wrench 1A according to the first embodiment. Fig. 3 is a cross-sectional view showing a part of the impact wrench 1A according to the first embodiment.

[0028] The impact wrench 1A includes a main body housing 2A, a handle 7, a battery mounting section 31A, a motor 10A, a controller 11A, a fan 12, a reduction mechanism 13A, a spindle 14, a striking mechanism 15A, an anvil 16A, and a trigger switch 17A.

[0029] The main body housing 2A accommodates at least the motor 10A. In this embodiment, the main body housing 2A also accommodates the controller 11A, the fan 12, the speed reduction mechanism 13A, the spindle 14, and the striking mechanism 15A. In addition, a portion of the anvil 16A is also accommodated in the main body housing 2A.

[0030] A grip portion 23A is provided on an upper portion of the main body housing 2A. The grip portion 23A includes a first grip portion 231A protruding to the left side from the main body housing 2A and a second grip portion 232A protruding to the right side from the main body housing 2A. The grip portion 23A is held by an operator. The trigger switch 17A is disposed in the grip portion 23A. In this embodiment, the trigger switch 17A is disposed in the first grip portion 231A.

[0031] An operator holds the handle 7. The handle 7 is provided on the upper part of the main body housing 2A.

[0032] The battery mounting section 31A is provided on the upper part of the outer circumferential surface of the main housing 2A. In this embodiment, three battery mounting sections 31A are provided. The three battery mounting sections 31A are arranged at intervals around the central axis of the main housing 2A extending in the up-down direction. In this embodiment, the three battery mounting sections 31A are arranged at equal intervals around the central axis of the main housing 2A.

[0033] A battery pack 33A is attached to the battery attachment section 31A. One battery pack 33A is attached to one battery attachment section 31A. The battery pack 33A is attached to and detached from the battery attachment section 31A.

[0034] The battery mounting section 31A has a terminal terminal. When the battery pack 33A is mounted in the battery mounting section 31A, a battery terminal which is a connection terminal of the battery pack 33A is connected to a terminal terminal of the battery mounting section 31A.

[0035] The battery pack 33A functions as a power source for the impact wrench 1A. The battery pack 33A includes a secondary battery. In this embodiment, the battery pack 33A includes a rechargeable lithium ion battery. When attached to the battery attachment section 31A, the battery pack 33A can supply power to the impact wrench 1A. The motor 10A is driven based on the power supplied from the battery pack 33A. The controller 11A operates based on the power supplied from the battery pack 33A.

[0036] The three battery packs 33A have the same rated voltage. The rated voltage of the battery packs 33A may be 18 V or 36 V. The three battery packs 33A have the same outer shape and dimensions. That is, the three battery packs 33A are of the same type.

[0037] The terminals of the three battery mounting sections 31A have the same structure and size.

[0038] The motor 10A functions as a power source for the impact wrench 1A. The motor 10A is an inner rotor type DC brushless motor. The motor 10A is accommodated in the main body housing 2A.

[0039] The motor 10A has a stator 47, a rotor 48, and a rotor shaft 49. At least a portion of the rotor 48 is disposed inside the stator 47. The stator 47 is disposed around the rotor 48. The rotor shaft 49 is fixed to the rotor 48. The rotor 48 is rotatable relative to the stator 47 about a motor rotation axis MX extending in the up-down direction (Z-axis direction).

[0040] 4 is a diagram illustrating a stator 47 according to the first embodiment. The stator 47 has a stator core 47A having a plurality of teeth, and a plurality of coils 47B wound around each of the plurality of teeth of the stator core 47A via an insulator. The plurality of coils 47B are connected via a busbar unit.

[0041] The outer shape of stator core 47A is substantially circular. Stator core 47A is formed so that the outer diameter Da of stator core 47A is a specified value.

[0042] 3, the rotor 48 rotates about a rotation axis AX. The rotation axis AX extends in the vertical direction. The rotor 48 has a rotor core and a rotor magnet fixed to the rotor core.

[0043] A sensor board 50 is fixed to the insulator of the stator 47. The sensor board 50 detects the position of the rotor 48 in the rotational direction. The sensor board 50 has a rotation detection element supported by an annular circuit board. The rotation detection element detects the position of the rotor magnet of the rotor 48, thereby detecting the position of the rotor 48 in the rotational direction.

[0044] The rotor shaft 49 is fixed to a rotor core of the rotor 48. The rotor 48 and the rotor shaft 49 rotate together about a rotation axis AX.

[0045] The rotor shaft 49 is rotatably supported by both the rotor bearing 51 and the rotor bearing 52. The rotor bearing 51 rotatably supports a lower portion of the rotor shaft 49 that protrudes downward beyond the lower end surface of the rotor 48. The rotor bearing 52 rotatably supports an upper portion of the rotor shaft 49 that protrudes upward beyond the upper end surface of the rotor 48. The rotor bearing 51 is held in the gear case 5.

[0046] A sun gear 55S is fixed to a lower end of the rotor shaft 49. The sun gear 55S is connected to at least a part of the reduction mechanism 13A. The rotor shaft 49 is connected to the reduction mechanism 13A via the sun gear 55S.

[0047] The controller 11A outputs a control signal for controlling the motor 10A. The controller 11A includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a central processing unit (CPU), a non-volatile memory such as a read only memory (ROM) or storage, a volatile memory such as a random access memory (RAM), a field effect transistor (FET), and a resistor.

[0048] The controller 11A is disposed above the motor 10A.

[0049] The fan 12 generates an airflow for cooling the motor 10A and the controller 11A. The fan 12 is disposed above the stator 47. The fan 12 is fixed to an upper portion of the rotor shaft 49. The fan 12 is disposed between the rotor bearing 51 and the stator 47. The fan 12 and the rotor shaft 49 rotate together.

[0050] The reduction mechanism 13A transmits the rotational force of the motor 10A to the impact mechanism 15A via the spindle 14. The reduction mechanism 13A reduces the rotational speed of the rotor 48 and transmits the reduced rotational speed to the impact mechanism 15A. The reduction mechanism 13A connects the rotor shaft 49 and the spindle 14. The reduction mechanism 13A rotates the spindle 14 at a rotational speed lower than the rotational speed of the rotor shaft 49. The reduction mechanism 13A includes a planetary gear mechanism 55 that is driven based on the rotational force of the motor 10A.

[0051] The planetary gear mechanism 55 has a sun gear 55S, a planetary gear 55P, and an internal gear 55I. A plurality of planetary gears 55P are provided. The plurality of planetary gears 55P are disposed around the sun gear 55S. The internal gear 55I is disposed around the plurality of planetary gears 55P. The planetary gear mechanism 55 is housed in a gear case 5.

[0052] The sun gear 55S is rotatable about a rotation axis AX that extends in the vertical direction. The sun gear 55S rotates as the rotor shaft 49 rotates.

[0053] Each of the multiple planetary gears 55P meshes with the sun gear 55S. The planetary gear 55P is rotatably supported on the spindle 14 via a pin 55A. The spindle 14 is rotated by the planetary gear 55P. The internal gear 55I has internal teeth that mesh with the planetary gear 55P. The internal gear 55I is fixed to the gear case 5. A plurality of protrusions are provided on the outer peripheral surface of the internal gear 55I. The protrusions of the internal gear 55I fit into recesses provided on the inner peripheral surface of the gear case 5. The internal gear 55I is always non-rotatable relative to the gear case 5.

[0054] When the rotor shaft 49 and the sun gear 55S are rotated by the drive of the motor 10A, the planetary gear 55P revolves around the sun gear 55S. The planetary gear 55P revolves while meshing with the internal teeth of the internal gear 55I. Due to the revolution of the planetary gear 55P, the spindle 14 connected to the planetary gear 55P via the pin 55A rotates at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0055] The spindle 14 rotates by the rotational force of the motor 10A transmitted by the reduction mechanism 13A. The spindle 14 transmits the rotational force of the motor 10A transmitted via the reduction mechanism 13A to the impact mechanism 15A. The spindle 14 is rotatable about an output rotation axis AX. At least a portion of the spindle 14 is disposed below the reduction mechanism 13A. The spindle 14 is disposed above the anvil 16A.

[0056] The spindle 14 has a flange portion 14A, a spindle shaft portion 14B, and a protruding portion 14C. The spindle shaft portion 14B protrudes downward from the flange portion 14A. The protruding portion 14C protrudes upward from the flange portion 14A.

[0057] The planetary gear 55P is rotatably supported by the flange portion 14A and the protruding portion 14C via the pin 55A. The spindle 14 is rotatably supported by a spindle bearing 58. The spindle bearing 58 rotatably supports the protruding portion 14C. The spindle bearing 58 is held by the gear case 5.

[0058] The impact mechanism 15A impacts the anvil 16A in the rotational direction about the rotation axis AX. The impact mechanism 15A is disposed below the motor 10A. The impact mechanism 15A is rotated by the rotor 48 of the motor 10A. The impact mechanism 15A is rotatable about the rotation axis AX. The rotational force of the motor 10A is transmitted to the impact mechanism 15A via the reduction mechanism 13A and the spindle 14. The impact mechanism 15A impacts the anvil 16A in the rotational direction based on the rotational force of the spindle 14 rotated by the motor 10A.

[0059] The striking mechanism 15A includes a hammer 71, a ball 72, a first coil spring 73, a second coil spring 74, and a washer .

[0060] The hammer 71 is disposed below the reduction gear mechanism 13A. The hammer 71 is disposed around the spindle shaft portion 14B. The hammer 71 is held by the spindle shaft portion 14B. The hammer 71 is rotated by the motor 10A. The ball 72 is disposed between the spindle shaft portion 14B and the hammer 71. The hammer 71 has a cylindrical hammer body 71A and a hammer protrusion provided at the front of the hammer body 71A. An annular recess 71C is provided on the rear surface of the hammer body 71A. The recess 71C is recessed downward from the upper surface of the hammer body 71A.

[0061] The hammer 71 is rotated by a motor 10A. The rotational force of the motor 10A is transmitted to the hammer 71 via a reduction gear mechanism 13A and a spindle 14. The hammer 71 can rotate together with the spindle 14 based on the rotational force of the spindle 14 rotated by the motor 10A. Each of the hammer 71 and the spindle 14 rotates about a rotation axis AX.

[0062] The washer 76 is disposed inside the recess 71C. The washer 76 is supported by the hammer 71 via a plurality of balls 78. The balls 78 are disposed below the washer 76.

[0063] The first coil spring 73 is disposed around the spindle shaft portion 14B. The upper end of the first coil spring 73 is supported by the flange portion 14A. The lower end of the first coil spring 73 is disposed inside the recess 71C and supported by a washer 76. The first coil spring 73 constantly generates an elastic force that moves the hammer 71 downward.

[0064] The second coil spring 74 is disposed around the spindle shaft portion 14B. The second coil spring 74 is disposed radially inward of the first coil spring 73. The upper end of the second coil spring 74 is supported by the flange portion 14A. The lower end of the second coil spring 74 is disposed inside the recess 71C and supported by the hammer 71. The second coil spring 74 generates an elastic force that moves the hammer 71 downward when the hammer 71 moves upward.

[0065] The ball 72 is made of a metal such as steel. The ball 72 is disposed between the spindle shaft portion 14B and the hammer 71. The spindle 14 has a spindle groove in which at least a part of the ball 72 is disposed. The spindle groove is provided on a part of the outer surface of the spindle shaft portion 14B. The hammer 71 has a hammer groove in which at least a part of the ball 72 is disposed. The hammer groove is provided on a part of the inner surface of the hammer 71. The ball 72 is disposed between the spindle groove and the hammer groove. The ball 72 can roll on the inside of the spindle groove and the inside of the hammer groove. The hammer 71 can move together with the ball 72. The spindle 14 and the hammer 71 can move relatively in a direction parallel to the rotation axis AX and in a rotation direction about the rotation axis AX within a movable range defined by the spindle groove and the hammer groove.

[0066] The anvil 16A rotates about a rotation axis AX extending in the vertical direction. The anvil 16A is an output part of the impact wrench 1A that rotates based on the rotational force of the motor 10A. At least a part of the anvil 16A is disposed below the hammer 71. The anvil 16A is struck in the rotational direction by the hammer 71 of the striking mechanism 15A. The lower end of the spindle shaft part 14B is disposed in an anvil recess provided in the upper end of the anvil 16A.

[0067] The anvil 16A has an anvil shaft portion 161 and an anvil protrusion portion 162. The anvil shaft portion 161 is disposed below the striking mechanism 15A. The anvil protrusion portion 162 protrudes from the upper end portion of the anvil shaft portion 161 radially outward from the anvil shaft portion 161. The anvil protrusion portion 162 is struck by the striking mechanism 15A in the rotational direction about the rotation axis AX.

[0068] The lower end of the anvil shaft portion 161 is disposed below the main housing 2 A through an opening in the lower part of the main housing 2 A. A socket is attached to the lower end of the anvil shaft portion 161 as a tip tool.

[0069] FIG. 5 is a diagram showing a schematic diagram of an anvil 16A according to the first embodiment. A socket is attached to the lower end (tip) of an anvil shaft portion 161 of the anvil 16A. The tip of the anvil shaft portion 161 to which the socket is attached is substantially rectangular prism-shaped. The anvil 16A is formed so that a distance Db between a first side and a second side of the tip of the anvil shaft portion 161 facing each other across the rotation axis AX is a specified value. The distance Db is the distance between the first side and the second side in a plane perpendicular to the rotation axis AX. The distance Db may be regarded as the length of one side of the anvil shaft portion 161 in a plane perpendicular to the rotation axis AX.

[0070] As shown in FIG. 3, the anvil 16A is rotatably supported by an anvil bearing 79. The anvil bearing 79 is disposed around the anvil shaft portion 161. The anvil 16A is rotatable about a rotation axis AX. In this embodiment, the anvil bearing 79 is a sliding bearing. The anvil bearing 79 is cylindrical. In this embodiment, a sleeve is used as the anvil bearing 79. Note that the sliding bearing may be formed by impregnating a cylindrical porous metal body manufactured by powder metallurgy, for example, with a lubricating oil.

[0071] In a cross section perpendicular to the rotation axis AX, the outer circumferential surface of the portion of the anvil shaft portion 161 supported by the anvil bearing 79 has a circular shape. In a cross section perpendicular to the rotation axis AX, the inner circumferential surface of the anvil bearing 79 has a circular shape.

[0072] The lower end of the anvil shaft portion 161 is disposed below the main body housing 2A through an opening at the lower end of the main body housing 2A. At least a portion of the anvil shaft portion 161 is disposed inside the opening at the lower end of the main body housing 2A.

[0073] The trigger switch 17A is operated by an operator to drive the motor 10A. Driving the motor 10A means that electricity is passed through the coil 47B of the stator 47 to rotate the rotor 48. The trigger switch 17A is provided on the first grip portion 231A. When the trigger switch 17A is operated to approach the first grip portion 231A, the motor 10A is driven. When the operation of the trigger switch 17A is released, the driving of the motor 10A is stopped.

[0074] 2, a switch panel 103 is disposed on the upper surface of the main body housing 2A. By operating a switch 104 provided on the switch panel 103, the rotation speed of the motor 10A may be changed.

[0075] <How the impact wrench works> Next, the operation of the impact wrench 1A will be described. For example, when performing a fastening operation of a work object, a socket used for the fastening operation is attached to the lower end of the anvil 16A. After the socket is attached to the anvil 16A, the worker holds the grip portion 23A with both hands and operates the trigger switch 17A so that the trigger switch 17A approaches the first grip portion 231A. When the trigger switch 17A is operated, power is supplied from the battery pack 33A to the motor 10A, and the motor 10A is driven. The rotor 48 and the rotor shaft 49 are rotated by the driving of the motor 10A. When the rotor shaft 49 rotates, the rotational force of the rotor shaft 49 is transmitted to the planetary gear 55P via the sun gear 55S. The planetary gear 55P revolves around the sun gear 55S while rotating on its own axis in a state of meshing with the internal teeth of the internal gear 55I. The planetary gear 55P is rotatably supported by the spindle 14 via the pin 55A. Due to the revolution of the planetary gear 55P, the spindle 14 rotates at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0076] When the spindle 14 rotates while the hammer protrusion and the anvil protrusion 162 are in contact with each other, the anvil 16A rotates together with the hammer 71 and the spindle 14. The fastening operation progresses as the anvil 16A rotates.

[0077] When a load equal to or greater than a predetermined value acts on the anvil 16A as the fastening operation progresses, the rotation of the anvil 16A and the hammer 71 stops. When the spindle 14 rotates while the rotation of the hammer 71 is stopped, the hammer 71 moves rearward. As the hammer 71 moves rearward, the contact between the hammer protrusion and the anvil protrusion 162 is released. The hammer 71 that has moved rearward moves forward while rotating due to the elastic force of the first coil spring 73 and the second coil spring 74. As the hammer 71 moves forward while rotating, the anvil 16A is struck in the rotational direction by the hammer 71. As a result, the anvil 16A rotates about the output rotation shaft AX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0078] In the present embodiment, the maximum tightening torque of the anvil 16A is 3200 Nm or more. The maximum tightening torque of the anvil 16A may be 3200 Nm or more and less than 6000 Nm.

[0079] The specifications of the impact wrench 1A according to this embodiment are as follows.

[0080] <Specifications> Maximum anvil tightening torque: 3200Nm - Total rated voltage of battery pack: 36V Stator core outer diameter Da: 50mm Maximum motor power: 1250W Anvil rotation speed (unloaded): 1200 rpm - Impact mechanism stroke rate: 1800 rpm Reduction ratio of reduction mechanism: 1 / 30 Hammer weight: 1.1kg Distance between the first and second sides of the anvil tip Db: 1 inch External dimensions of impact wrench without battery pack: Front-to-back 680mm x Left-to-right 680mm x Up-to-down 240mm Weight of impact wrench without battery pack: 10kg

[0081] One or more battery packs with a rated voltage of 36 V (maximum 40 V) may be attached to the impact wrench 1A so that the sum of the rated voltages of the battery packs is 36 V or more. Note that two or more battery packs with a rated voltage of 18 V may be attached to the impact wrench 1A.

[0082] <Effects> As described above, in the embodiment, the impact wrench 1A includes the motor 10A, which is a brushless motor having the rotor 48 and the stator 47 arranged around the rotor 48, the impact mechanism 15A rotated by the rotor 48, the anvil 16A struck by the impact mechanism 15A, and the battery mounting section 31A to which the battery pack 33A is attached. The maximum tightening torque of the anvil 16A is 3200 Nm or more.

[0083] In the above configuration, the anvil 16A of the impact wrench 1A has a high torque.

[0084] In the embodiment, the sum of the rated voltages of the battery packs 33A is 36V or more. The outer diameter Da of the stator core 47A is 50mm or more. The maximum output of the motor 10A is 1250W or more. The rotation speed of the anvil 16A after being decelerated by the reduction mechanism 13A is 1200rpm. The impact speed of the impact mechanism 15A is 1800rpm. The weight of the hammer 71 of the impact mechanism 15A is 1.1kg. The reduction ratio of the reduction mechanism 13A is 1 / 30. The distance Db between the first and second sides of the tip portions of the anvil 16A facing each other is 1 inch.

[0085] In the above configuration, the maximum tightening torque of the anvil 16A can be set to 3200 Nm or more.

[0086] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0087] <Impact wrench> 6 is a front view showing an impact wrench 1B according to a second embodiment. The impact wrench 1B according to this embodiment is a modified example of the impact wrench 1A according to the above-mentioned first embodiment.

[0088] The impact wrench 1B includes a main body housing 2B, a battery mounting portion 31B, a motor 10B, a controller 11B, a reduction mechanism 13A, an impact mechanism 15A, an anvil 16B, a grip portion 23B including a first grip portion 231B and a second grip portion 232B, and a trigger switch 17B.

[0089] The battery mounting portion 31B is provided on an upper portion of the outer circumferential surface of the main housing 2A. In this embodiment, one battery mounting portion 31B is provided.

[0090] A battery pack 33B is attached to the battery attachment section 31B. The battery pack 33B is attached to and detached from the battery attachment section 31B.

[0091] The rated voltage of the battery pack 33B may be 18V, 36V, or 72V.

[0092] In the present embodiment, the maximum tightening torque of the anvil 16B is 6000 Nm or more. The maximum tightening torque of the anvil 16B may be 6000 Nm or more and less than 10000 Nm.

[0093] The specifications of the impact wrench 1B according to this embodiment are as follows.

[0094] <Specifications> Maximum anvil tightening torque: 6000Nm - Total rated voltage of battery pack: 72V Stator core outer diameter Da: 60mm Maximum motor power: 2500W Anvil rotation speed (unloaded): 1200 rpm - Impact mechanism stroke rate: 1800 rpm Reduction ratio of reduction mechanism: 1 / 30 Hammer weight: 2.2kg Distance between the first and second sides of the anvil tip Db: 1 / 2 inch External dimensions of impact wrench without battery pack: Front-to-back 680mm x Left-to-right 680mm x Up-to-down 240mm Weight of impact wrench without battery pack: 20kg

[0095] One or more battery packs with a rated voltage of 72 V (maximum 80 V) may be attached to the impact wrench 1B so that the sum of the rated voltages of the battery packs is 72 V or more. Two or more battery packs with a rated voltage of 36 V may be attached to the impact wrench 1B, and four or more battery packs with a rated voltage of 18 V may be attached to the impact wrench 1B.

[0096] <Effects> As described above, in the embodiment, the maximum tightening torque of the anvil 16B of the impact wrench 1B is 6000 Nm or more.

[0097] In the above configuration, the anvil 16B of the impact wrench 1B has a high torque.

[0098] In the embodiment, the sum of the rated voltages of the battery packs 33B is 72 V or more. The outer diameter Db of the stator core 47A is 60 mm or more. The maximum output of the motor 10B is 2500 W or more. The rotation speed of the anvil 16B after being decelerated by the reduction mechanism 13B is 1200 rpm. The impact rate of the impact mechanism 15B is 1800 rpm. The weight of the hammer of the impact mechanism 15B is 2.2 kg. The reduction ratio of the reduction mechanism 13B is 1 / 30. The distance Db between the first and second sides of the tip portions of the anvil 16B facing each other is 1 / 2 inch or more and 1 inch or less.

[0099] With the above configuration, the maximum tightening torque of the anvil can be set to 6000 Nm or more.

[0100] [Third embodiment] A third embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0101] <Impact wrench> 7 is a top view showing an impact wrench 1C according to a third embodiment. The impact wrench 1C according to this embodiment is a modified example of the impact wrench 1A according to the above-mentioned first embodiment.

[0102] The impact wrench 1C has a main housing 2C and a battery mounting portion 31C provided on the outer circumferential surface of the main housing 2C. A switch panel 103 is disposed on the upper surface of the main housing 2C.

[0103] In this embodiment, five battery mounting sections 31C are provided. The five battery mounting sections 31C are arranged at intervals around the central axis of the main body housing 2C that extends in the up-down direction. In this embodiment, the five battery mounting sections 31C are arranged at equal intervals around the central axis of the main body housing 2C.

[0104] A battery pack 33C is attached to the battery attachment section 31C. One battery pack 33C is attached to one battery attachment section 31C. The battery pack 33C is attached to and detached from the battery attachment section 31C.

[0105] The five battery packs 33C have the same rated voltage. The rated voltage of the battery packs 33C may be 18 V, 36 V, or 72 V. The outer shapes and dimensions of the five battery packs 33C are the same. That is, the five battery packs 33C are of the same type.

[0106] The terminals of the five battery mounting sections 31C have the same structure and size.

[0107] In this embodiment, the maximum tightening torque of the anvil of the impact wrench 1C is 10,000 Nm or more.

[0108] The specifications of the impact wrench 1C according to this embodiment are as follows.

[0109] <Specifications> Maximum anvil tightening torque: 10000Nm - Total rated voltage of battery pack: 144V Stator core outer diameter Da: 60mm Maximum motor power: 5000W Anvil rotation speed (unloaded): 1200 rpm - Impact mechanism stroke rate: 1800 rpm Reduction ratio of reduction mechanism: 1 / 30 Hammer weight: 4.4kg Distance between the first and second sides of the anvil tip Db: 1 / 2 inch External dimensions of impact wrench without battery pack: Front-to-back 680mm x Left-to-right 680mm x Up-to-down 240mm Weight of impact wrench without battery pack: 40kg

[0110] Two or more battery packs with a rated voltage of 72 V (maximum 80 V) may be attached to the impact wrench 1C so that the sum of the rated voltages of the battery packs is 144 V or more. It is also possible to attach four or more battery packs with a rated voltage of 36 V to the impact wrench 1C, and eight or more battery packs with a rated voltage of 18 V to the impact wrench 1C.

[0111] <Effects> As described above, in the embodiment, the maximum tightening torque of the anvil of the impact wrench 1C is 10,000 Nm or more.

[0112] In the above configuration, the anvil of the impact wrench 1C has a high torque.

[0113] In the embodiment, the sum of the rated voltages of the battery packs 33C is 144 V or more. The outer diameter of the stator core 47A is 60 mm or more. The maximum output of the motor 10A is 5000 W or more. The rotation speed of the anvil after being decelerated by the reduction mechanism is 1200 rpm. The impact rate of the impact mechanism is 1800 rpm. The weight of the hammer of the impact mechanism is 4.4 kg. The reduction ratio of the reduction mechanism is 1 / 30. The distance Db between the first and second sides of the tip portions of the anvils facing each other is 1 / 2 inch or more and 2 inches or less.

[0114] With the above configuration, the maximum tightening torque of the anvil can be made 10,000 Nm or more.

[0115] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0116] <Impact wrench> 8 is a top view showing an impact wrench 1D according to a fourth embodiment. The impact wrench 1D according to this embodiment is a modified example of the impact wrench 1A according to the above-mentioned first embodiment.

[0117] The impact wrench 1D has a main body housing 2D and a battery mounting section 31D provided in the main body housing 2D. A switch panel 103 is disposed on the upper surface of the main body housing 2D.

[0118] In this embodiment, four battery mounting sections 31D are provided: two battery mounting sections 31D are provided in the front part of the main body housing 2D, and two battery mounting sections 31D are provided in the rear part of the main body housing 2D.

[0119] A battery pack 33D is attached to the battery attachment section 31D. One battery pack 33D is attached to one battery attachment section 31D. The battery pack 33D is attached to and detached from the battery attachment section 31D.

[0120] The four battery packs 33D have the same rated voltage. The four battery packs 33D have the same outer shapes and dimensions. That is, the four battery packs 33D are of the same type.

[0121] The terminals of the four battery mounting sections 31D have the same structure and size.

[0122] The specifications of the impact wrench 1D according to this embodiment are as follows.

[0123] <Specifications> Maximum anvil tightening torque: 32000Nm - Total rated voltage of battery pack: 320V Stator core outer diameter Da: 80mm Maximum motor power: 5000W Anvil rotation speed (unloaded): 570 rpm - Impact rate of the impact mechanism: 750 rpm Reduction ratio of reduction mechanism: 1 / 52.6 Hammer weight: 34kg Distance between the first and second sides of the anvil tip Db: 2.5 inches External dimensions of impact wrench without battery pack: Front-to-back 680mm x Left-to-right 680mm x Up-to-down 240mm Weight of impact wrench without battery pack: 100kg

[0124] Four or more battery packs each having a rated voltage of up to 80V may be attached to the impact wrench 1D so that the sum of the rated voltages of the battery packs is 320V or more.

[0125] [Fifth embodiment] A fifth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0126] <Impact wrench> FIG. 9 is a side view showing an impact wrench 1E according to the fifth embodiment.

[0127] The impact wrench 1E includes a main body housing 2E, a motor 10E, a controller 11E, a speed reduction mechanism 13E, a striking mechanism 15E, an anvil 16E, and a trigger switch 17E.

[0128] The main body housing 2E has a main body portion 21E that houses the motor 10E, and a grip portion 231E that extends downward from the lower portion of the main body portion 21E. The trigger switch 17E is disposed in the front portion of the grip portion 231E. In addition, a first handle 232E is provided in the rear portion of the main body portion 21E, and a second handle 233E is provided in the upper portion of the main body portion 21E.

[0129] The controller 11E is disposed on the upper part of the grip part 231E. The speed reducing mechanism 13E is disposed on the front side of the motor 10E in the main body part 21E. The impact mechanism 15E is disposed on the front side of the speed reducing mechanism 13E. In this embodiment, the rotation axis AX extends in the front-rear direction. The rotor of the motor 10E rotates around the rotation axis AX. The impact mechanism 15E impacts the anvil 16E in the rotation direction around the rotation axis AX. The anvil 16E rotates around the rotation axis AX.

[0130] In this embodiment, there is one battery pack 33E. A battery mounting section 31E is provided in the main body section 21E. In this embodiment, the battery mounting section 31E is provided on the right side of the main body section 21E. The battery mounting section 31E may be provided on the left side of the main body section 21E.

[0131] The specifications of the impact wrench 1E according to this embodiment are as follows.

[0132] <Specifications> Maximum anvil tightening torque: 7500Nm - Total rated voltage of battery pack: 72V Stator core outer diameter Da: 80mm Maximum motor power: 7500W Anvil rotation speed (unloaded): 761 rpm - Impact mechanism stroke rate: 1000 rpm Reduction ratio of reduction mechanism: 1 / 39.4 Hammer weight: 4.5kg Distance between the first and second sides of the anvil tip Db: 1.5 inches External dimensions of impact wrench without battery pack: Front-to-back 340mm x Left-to-right 160mm x Up-to-down 401mm Weight of impact wrench without battery pack: 30kg

[0133] One or more battery packs having a rated voltage of 72V may be attached to the impact wrench 1E so that the sum of the rated voltages of the battery packs is 72V or more.

[0134] [Sixth embodiment] A sixth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0135] <Impact wrench> 10 is a top view showing an impact wrench 1F according to a sixth embodiment. The impact wrench 1F according to this embodiment is a modified example of the impact wrench 1E according to the fifth embodiment described above.

[0136] The impact wrench 1F includes a main body housing 2F, a striking mechanism 15F, an anvil 16F, a first handle portion 232F, and a second handle portion 233F. A switch panel 103 is disposed on the upper surface of the main body housing 2F.

[0137] In this embodiment, there are two battery mounting sections 31F. One battery mounting section 31F is provided on the left side of the main housing 2F, and the other battery mounting section 31F is provided on the right side of the main housing 2F. One battery pack 33F is mounted in one battery mounting section 31F.

[0138] For example, by mounting one battery pack 33F having a rated voltage of 36 V on each of the two battery mounting sections 31F so that the sum of the rated voltages of the battery packs is 72 V or more, it is possible to achieve specifications similar to those of the impact wrench 1E described in the fifth embodiment above.

[0139] Also, a battery pack 33F having a rated voltage of 18 V may be attached to each of the two battery attachment sections 31F so that the sum of the rated voltages of the battery packs is equal to or greater than 36 V. Also, the specifications of the impact wrench 1F may be as follows.

[0140] <Specifications> Maximum anvil tightening torque: 4000Nm - Total rated voltage of battery pack: 36V Stator core outer diameter Da: 80mm Maximum motor power: 4000W Anvil rotation speed (unloaded): 685 rpm - Impact mechanism stroke rate: 900 rpm Reduction ratio of reduction mechanism: 1 / 52.6 Hammer weight: 2.3kg Distance between the first and second sides of the anvil tip Db: 1 inch External dimensions of impact wrench without battery pack: Front-to-back 340mm x Left-to-right 160mm x Up-to-down 401mm Weight of impact wrench without battery pack: 15kg

[0141] [Seventh embodiment] A seventh embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0142] <Impact wrench> FIG. 11 is a side view showing an impact wrench 1G according to the seventh embodiment.

[0143] The impact wrench 1G includes a main body housing 2G, a motor 10G, a controller 11G, a speed reducing mechanism 13G, a striking mechanism 15G, an anvil 16G, and a trigger switch 17G. A switch panel 103 may be disposed on the upper surface of the main body housing 2G.

[0144] The main body housing 2G has a main body portion 21G that houses the motor 10G, and a grip portion 23G provided at the rear of the main body portion 21G. The trigger switch 17G is disposed on the grip portion 23G.

[0145] The controller 11G is disposed at the rear of the main body 21G. The reduction mechanism 13G is disposed in front of the motor 10G in the main body 21G. The impact mechanism 15G is disposed in front of the reduction mechanism 13G. In this embodiment, the rotation axis AX extends in the front-rear direction. The rotor of the motor 10G rotates around the rotation axis AX. The impact mechanism 15G impacts the anvil 1GE in the rotation direction around the rotation axis AX. The anvil 16G rotates around the rotation axis AX.

[0146] In this embodiment, there is one battery pack 33G. A battery mounting section 31G is provided at the bottom of the main body section 21G.

[0147] The specifications of the impact wrench 1E according to this embodiment are as follows.

[0148] <Specifications> Maximum anvil tightening torque: 7500Nm - Total rated voltage of battery pack: 72V Stator core outer diameter Da: 80mm Maximum motor power: 7500W Anvil rotation speed (unloaded): 761 rpm - Impact mechanism stroke rate: 1000 rpm Reduction ratio of reduction mechanism: 1 / 39.4 Hammer weight: 4.5kg Distance between the first and second sides of the anvil tip Db: 1.5 inches External dimensions of impact wrench without battery pack: Front-to-back 542mm x Left-to-right 122mm x Up-to-down 236mm Weight of impact wrench without battery pack: 30kg

[0149] One or more battery packs having a rated voltage of 72V may be attached to the impact wrench 1G so that the sum of the rated voltages of the battery packs is 72V or more.

[0150] [Eighth embodiment] An eighth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0151] <Impact wrench> FIG. 12 is a front view showing an impact wrench 1H according to the eighth embodiment.

[0152] The impact wrench 1H includes a main body housing 2H, a first grip portion 231H, a second grip portion 232H, a motor 10H, a controller 11H, a speed reduction mechanism 13H, a striking mechanism 15H, an anvil 16H, and a trigger switch 17H.

[0153] The motor 10H is accommodated in a main body housing 2H. The first grip portion 231H protrudes to the left from the main body housing 2H. The second grip portion 232H protrudes to the right from the main body housing 2H. The trigger switch 17H is disposed in the second grip portion 232H.

[0154] The controller 11H is accommodated in the right part of the main housing 2H. The reduction mechanism 13G is disposed below the motor 10H. The impact mechanism 15H is disposed below the reduction mechanism 13H. The tip of the anvil 16H protrudes downward from the lower end of the main housing 2H. In this embodiment, the rotation axis AX extends in the vertical direction. The rotor of the motor 10H rotates around the rotation axis AX. The impact mechanism 15H impacts the anvil 16H in the rotation direction around the rotation axis AX. The anvil 16H rotates around the rotation axis AX.

[0155] In this embodiment, there is one battery pack 33H. A battery mounting portion 31H is provided on the upper portion of the main body housing 2H.

[0156] The specifications of the impact wrench 1H according to this embodiment are as follows.

[0157] <Specifications> Maximum anvil tightening torque: 7500Nm - Total rated voltage of battery pack: 72V Stator core outer diameter Da: 80mm Maximum motor power: 7500W Anvil rotation speed (unloaded): 761 rpm - Impact mechanism stroke rate: 1000 rpm Reduction ratio of reduction mechanism: 1 / 39.4 Hammer weight: 4.5kg Distance between the first and second sides of the anvil tip Db: 1.5 inches External dimensions of impact wrench without battery pack: Front-to-back 219mm x Left-to-right 540mm x Up-to-down 854mm Weight of impact wrench without battery pack: 30kg

[0158] One or more battery packs having a rated voltage of 72V may be attached to the impact wrench 1H so that the sum of the rated voltages of the battery packs is 72V or more. [Explanation of symbols]

[0159] 1A...Impact wrench, 1B...Impact wrench, 1C...Impact wrench, 1D...Impact wrench, 1E...Impact wrench, 1F...Impact wrench, 1G...Impact wrench, 1H...Impact wrench, 2A...Main body housing, 2B...Main body housing, 2C...Main body housing, 2D...Main body housing, 2E...Main body housing, 2F...Main body housing, 2G...Main body housing, 2H...Main body housing, 5...Gear case, 7...Handle, 10A...Motor, 10B...Motor, 10E...Motor, 10G...Motor, 10H...Motor, 11A...Controller , 11B...controller, 11E...controller, 11G...controller, 11H...controller, 12...fan, 13A...reduction mechanism, 13B...reduction mechanism, 13E...reduction mechanism, 13G...reduction mechanism, 13H...reduction mechanism, 14...spindle, 14A...flange portion, 14B...spindle shaft portion, 14C...protrusion, 15A...striking mechanism, 15B...striking mechanism, 15E...striking mechanism, 15F...striking mechanism, 15G...striking mechanism, 15H...striking mechanism, 16A...anvil, 16B...anvil, 16E...anvil, 16F...anvil, 16G...anvil, 16H...anvil, 17 A...trigger switch, 17B...trigger switch, 17E...trigger switch, 17G...trigger switch, 17H...trigger switch, 21E...main body, 21G...main body, 23A...grip, 23B...grip, 23G...grip, 31A...battery mounting section, 31B...battery mounting section, 31C...battery mounting section, 31D...battery mounting section, 31E...battery mounting section, 31F...battery mounting section, 31G...battery mounting section, 31H...battery mounting section, 33A...battery pack, 33B...battery pack, 33C...battery pack, 33D...battery pack, 3E...battery pack, 33F...battery pack, 33G...battery pack, 33H...battery pack, 47...stator, 47A...stator core, 47B...coil, 48...rotor, 49...rotor shaft, 50...sensor board, 51...rotor bearing, 52...rotor bearing, 55...planetary gear mechanism, 55A...pin, 55I...internal gear, 55P...planetary gear, 55S...sun gear, 58...spindle bearing, 71...hammer, 71A...hammer body, 71C...recess, 72...ball, 73...first coil spring, 74...second coil spring, 76...washer,78...ball, 79...anvil bearing, 161...anvil shaft portion, 162...anvil protrusion portion, 231A...first grip portion, 232A...second grip portion, 231B...first grip portion, 232B...second grip portion, 231E...grip portion, 232E...first handle, 233E...second handle, 232F...first handle portion, 233F...second handle portion, 231H...first grip portion, 232H...second grip portion, Da...outer diameter, Db...distance, AX...rotation axis.

Claims

1. a brushless motor having a stator and a rotor that rotates relative to the stator; a striking mechanism rotated by the rotor; an anvil that is struck by the striking mechanism; a battery mounting section to which a battery pack is mounted, The maximum tightening torque of the anvil is 3200 Nm or more. Impact wrench.

2. The sum of the rated voltages of the battery packs is 36 V or more, The outer diameter of the stator is 50 mm or more. The impact wrench according to claim 1.

3. The maximum output of the brushless motor is 1250 W or more. The impact wrench according to claim 1.

4. a speed reduction mechanism that reduces the rotation speed of the rotor and transmits the reduced speed to the impact mechanism; The rotation speed of the anvil is 600 rpm or more and 2400 rpm or less. The impact wrench according to claim 1.

5. The impact rate of the impact mechanism is 900 rpm or more and 3200 rpm or less. The impact wrench according to claim 1.

6. The weight of the hammer of the striking mechanism is equal to or greater than 0.55 kg and equal to or less than 2.2 kg. The impact wrench according to claim 1.

7. a speed reduction mechanism that reduces the rotational speed of the rotor and transmits the reduced rotational speed to the impact mechanism; The reduction ratio of the reduction mechanism is 1 / 60 or more and 1 / 15 or less. The impact wrench according to claim 1.

8. The tip of the anvil to which the socket is attached is in the shape of a square pillar, The distance between the first and second opposing sides of the tip of the anvil is 1 inch or more and 2.5 inches or less. The impact wrench according to claim 1.

9. a brushless motor having a stator and a rotor that rotates relative to the stator; a striking mechanism rotated by the rotor; an anvil that is struck by the striking mechanism; a battery mounting section to which a battery pack is mounted, The maximum tightening torque of the anvil is 6000 Nm or more. Impact wrench.

10. The sum of the rated voltages of the battery packs is 72 V or more, The outer diameter of the stator is 60 mm or more. The impact wrench according to claim 9.

11. The maximum output of the brushless motor is 2500 W or more. The impact wrench according to claim 10.

12. a speed reduction mechanism that reduces the rotation speed of the rotor and transmits the reduced speed to the impact mechanism; The rotation speed of the anvil is 600 rpm or more and 2400 rpm or less. The impact wrench according to claim 10.

13. The impact rate of the impact mechanism is 900 rpm or more and 3200 rpm or less. The impact wrench according to claim 10.

14. The weight of the hammer of the striking mechanism is 1.1 kg or more and 4.4 kg or less. The impact wrench according to claim 10.

15. a speed reduction mechanism that reduces the rotational speed of the rotor and transmits the reduced rotational speed to the impact mechanism; The reduction ratio of the reduction mechanism is 1 / 60 or more and 1 / 15 or less. The impact wrench according to claim 10.

16. The tip of the anvil to which the socket is attached is in the shape of a square pillar, The distance between the first and second opposing sides of the tip of the anvil is 1 inch or more and 2.5 inches or less. The impact wrench according to claim 10.

17. a brushless motor having a stator and a rotor that rotates relative to the stator; a striking mechanism rotated by the rotor; an anvil that is struck by the striking mechanism; a battery mounting section to which a battery pack is mounted, The maximum tightening torque of the anvil is 10,000 Nm or more. Impact wrench.

18. The sum of the rated voltages of the battery packs is 144 V or more, The outer diameter of the stator is 60 mm or more.

18. The impact wrench of claim 17.

19. The maximum output of the brushless motor is 5000 W or more.

18. The impact wrench of claim 17.

20. a speed reduction mechanism that reduces the rotation speed of the rotor and transmits the reduced speed to the impact mechanism; The rotation speed of the anvil is 600 rpm or more and 2400 rpm or less.

18. The impact wrench of claim 17.

21. The impact rate of the impact mechanism is 900 rpm or more and 3200 rpm or less.

18. The impact wrench of claim 17.

22. The weight of the hammer of the striking mechanism is 2.2 kg or more and 3.8 kg or less.

18. The impact wrench of claim 17.

23. a speed reduction mechanism that reduces the rotational speed of the rotor and transmits the reduced rotational speed to the impact mechanism; The reduction ratio of the reduction mechanism is 1 / 60 or more and 1 / 15 or less.

18. The impact wrench of claim 17.

24. The tip of the anvil to which the socket is attached is in the shape of a square pillar, The distance between the first and second opposing sides of the tip of the anvil is 1 inch or more and 2.5 inches or less.

18. The impact wrench of claim 17.

25. The battery capacity of the battery pack is 5 Ah or more. An impact wrench according to any one of claims 1, 9 and 17.

26. The current supplied to the brushless motor is 80 A or less. An impact wrench according to any one of claims 1, 9 and 17.

27. The impact energy per impact by the impact mechanism is 95 J or more. An impact wrench according to any one of claims 1, 9 and 17.

Images