Angle impact tool

Abstract

To achieve higher torque of an output shaft of an angle impact tool.SOLUTION: An angle impact tool includes: a brushless motor that has a stator and a rotor rotating around a first rotation shaft with respect to the stator; a striking mechanism that rotates by the rotor; an output shaft that is hit by the striking mechanism and rotates around a second rotation shaft; a motor housing that stores the brushless motor; and a battery attachment part to which a battery pack is attached. In a front and rear direction orthogonal to the second rotation shaft, the striking mechanism and the output shaft are arranged in a further front side than the brushless motor. The front and rear direction and the output shaft are orthogonal to each other. Maximum fastening torque of the output shaft is 500 Nm or more and less than 1,000 Nm.SELECTED DRAWING: Figure 7

Description

[Technical field]

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

[0002] 2. Description of the Related Art In the technical field relating to angle impact tools, an angle impact driver such as that disclosed in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-200884 A 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 output shaft of an angle impact tool. [Means for solving the problem]

[0005] This specification discloses an angle impact tool. The angle impact tool may include a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis, an impact mechanism rotated by the rotor, an output shaft that is struck by the impact mechanism and rotates about a second rotation axis, a motor housing that accommodates the brushless motor, and a battery mounting section to which a battery pack is attached. In a front-rear direction perpendicular to the second rotation axis, the impact mechanism and the output shaft may be disposed forward of the brushless motor. The front-rear direction may be perpendicular to the output shaft. The maximum tightening torque of the output shaft may be 500 Nm or more and less than 1000 Nm. Effect of the Invention

[0006] According to the technology disclosed in this specification, the output shaft of an angle impact tool is made high torque. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a side view showing an impact wrench according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a part of the impact wrench according to the first embodiment. [Diagram 3] FIG. 3 is a diagram illustrating a stator according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating a schematic view of an output shaft according to the first embodiment. [Diagram 5] FIG. 5 is a side view showing an impact wrench according to the second embodiment. [Figure 6] FIG. 6 is a side view showing an impact wrench according to the third embodiment. [Figure 7] FIG. 7 is a side view showing an impact wrench according to the fourth embodiment. [Figure 8] FIG. 8 is a side view showing the impact wrench according to the fifth embodiment. [Figure 9] FIG. 9 is a diagram illustrating an impact wrench according to the sixth embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing a part of the impact driver according to the seventh embodiment. [Figure 11] FIG. 11 is a diagram showing the relationship between the rated voltage and the outer diameter of the stator core and the maximum tightening torque of the output shaft of the battery pack according to the embodiment. [Figure 12] FIG. 12 is a diagram showing an impact wrench according to another embodiment. [Figure 13] FIG. 13 is a diagram showing an impact wrench according to another embodiment. [Figure 14] FIG. 14 is a diagram showing an impact wrench according to another embodiment. [Figure 15]FIG. 15 is a diagram showing a schematic view of a part of an angle impact tool according to another embodiment. [Figure 16] FIG. 16 is a diagram illustrating a motor according to another embodiment. [Figure 17] FIG. 17 is a diagram showing a portion of an angle impact tool according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In one or more embodiments, the angle impact tool may include a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis, an impact mechanism rotated by the rotor, an output shaft that is struck by the impact mechanism and rotates about a second rotation axis, a motor housing that accommodates the brushless motor, and a battery mounting section to which a battery pack is attached. In a front-to-rear direction perpendicular to the second rotation axis, the impact mechanism and the output shaft may be disposed forward of the brushless motor. The front-to-rear direction may be perpendicular to the output shaft. The maximum tightening torque of the output shaft may be 500 Nm or more and less than 1000 Nm.

[0009] In the above configuration, the output shaft of the angle impact tool has a high torque. 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 nut or bolt. Generally, this maximum tightening torque is listed in the catalog of each manufacturer.

[0010] In one or more embodiments, the rated voltage of the battery pack may be 18V or more. The outer diameter of the stator may be 50mm or more. The maximum output of the brushless motor may be 400W or more. The rotation speed of the output shaft may be 1000 rpm or more and 4000 rpm or less. The impact rate of the impact mechanism may be 1250 rpm or more and 5000 rpm or less. The weight of the hammer of the impact mechanism may be 160g or more and 640g or less. The reduction ratio of the reduction mechanism may be / 18.0 or more and 1 / 4.5 or less. The distance between first and second sides of the opposing tip portions of the output shafts may be ½ inch or more and 2.5 inches or less.

[0011] In the above configuration, the maximum tightening torque of the output shaft can be made 500 Nm or more.

[0012] In one or more embodiments, the angle impact tool may include a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis, an impact mechanism rotated by the rotor, an output shaft that is struck by the impact mechanism and rotates about a second rotation axis, a motor housing that accommodates the brushless motor, and a battery mounting section to which a battery pack is attached. In a front-to-rear direction perpendicular to the second rotation axis, the impact mechanism and the output shaft may be disposed forward of the brushless motor. The front-to-rear direction may be perpendicular to the output shaft. The maximum tightening torque of the output shaft may be equal to or greater than 1000 Nm and less than 1500 Nm.

[0013] In the above configuration, the output shaft of the angle impact tool is made high torque.

[0014] In one or more embodiments, the rated voltage of the battery pack may be 18V or more. The outer diameter of the stator may be 50mm or more. The maximum output of the brushless motor may be 500W or more. The rotation speed of the output shaft may be 800 rpm or more and 3200 rpm or less. The impact rate of the impact mechanism may be 1100 rpm or more and 4400 rpm or less. The weight of the hammer of the impact mechanism may be 310g or more and 1240g or less. The reduction ratio of the reduction mechanism may be 1 / 20.0 or more and 1 / 5.0 or less. The distance between first and second sides of the opposing tip portions of the output shafts may be 1 / 2 inch or more and 2.5 inches or less.

[0015] In the above configuration, the maximum tightening torque of the output shaft can be made 1000 Nm or more.

[0016] In one or more embodiments, the angle impact tool may include a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis, an impact mechanism rotated by the rotor, an output shaft that is struck by the impact mechanism and rotates about a second rotation axis, a motor housing that accommodates the brushless motor, and a battery mounting section to which a battery pack is attached. In a front-to-rear direction perpendicular to the second rotation axis, the impact mechanism and the output shaft may be disposed forward of the brushless motor. The front-to-rear direction may be perpendicular to the output shaft. The maximum tightening torque of the output shaft may be 1500 Nm or more and less than 3000 Nm.

[0017] In the above configuration, the output shaft of the angle impact tool is made high torque.

[0018] In one or more embodiments, the rated voltage of the battery pack may be 18V or more. The outer diameter of the stator may be 50mm or more. The maximum output of the brushless motor may be 650W or more. The rotation speed of the output shaft may be 900 rpm or more and 3600 rpm or less. The impact rate of the impact mechanism may be 1250 rpm or more and 5000 rpm or less. The weight of the hammer of the impact mechanism may be 265g or more and 1060g or less. The reduction ratio of the reduction mechanism may be 1 / 30.0 or more and 1 / 7.5 or less. The distance between first and second sides of the opposing tip portions of the output shafts may be 3 / 4 inches or more and 2.5 inches or less.

[0019] In the above configuration, the maximum tightening torque of the output shaft can be made 1500 Nm or more.

[0020] In one or more embodiments, the angle impact tool may include a gear mechanism that receives rotation from the impact mechanism. The output shaft may rotate based on the rotation received from the gear mechanism.

[0021] In the above configuration, the rotational force of the motor is transmitted in the order of the impact mechanism, the gear mechanism, and the output shaft. The gear mechanism may reduce or increase the rotational speed of the impact mechanism. The gear mechanism may include a planetary gear mechanism or a bevel gear.

[0022] In one or more embodiments, the angle impact tool may include a gear mechanism that receives rotation from the rotor. The impact mechanism may rotate based on the rotation received from the gear mechanism.

[0023] In the above configuration, the rotational force of the motor is transmitted in the order of the gear mechanism, the impact mechanism, and the output shaft. The gear mechanism may reduce or increase the rotational speed of the motor. The gear mechanism may include a planetary gear mechanism or a bevel gear.

[0024] 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.

[0025] 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.

[0026] 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].

[0027] [First embodiment] A first embodiment will be described.

[0028] <Impact wrench> Fig. 1 is a side view showing an impact wrench 1A according to the first embodiment. Fig. 2 is a cross-sectional view showing a part of the impact wrench 1A according to the first embodiment. The impact wrench 1A is an angle impact wrench, which is a type of angle impact tool.

[0029] The impact wrench 1A comprises a main body housing 2A, a gear housing 5, a handle 7, a first battery mounting section 31A, a second battery mounting section 32A, a motor 10A, a controller 11A, a fan 12, a reduction mechanism 13A, a spindle 14, an impact mechanism 15A, an anvil 16A, an intermediate shaft 95, an output shaft 20A, and a trigger switch 17A.

[0030] The main body housing 2A accommodates at least the motor 10A. The main body housing 2A has a motor housing 21, a grip housing 23A, and a controller housing 24.

[0031] The motor housing 21 accommodates the motor 10A. The grip housing 23A is disposed rearward of the motor housing 21. The grip housing 23A is connected to a rear portion of the motor housing 21. The grip housing 23A is held by an operator. In this embodiment, the grip housing 23A includes a first grip portion 231 and a second grip portion 232 disposed below the first grip portion 231. The trigger switch 17A is disposed in the first grip portion 231.

[0032] The controller housing 24 accommodates the controller 11 A. The rear end of the first grip portion 231 and the rear end of the second grip portion 232 are each connected to the controller housing 24.

[0033] The gear housing 5 is disposed forward of the motor housing 21. The gear housing 5 accommodates the reduction mechanism 13A, the spindle 14, the striking mechanism 15A, the anvil 16A, and the intermediate shaft 95. The gear housing 5 accommodates a portion of the output shaft 20A.

[0034] The handle 7 is held by an operator and is provided so as to protrude upward from the gear housing 5.

[0035] In the front-rear direction, the striking mechanism 15A, the anvil 16A, and the output shaft 20A are disposed forward of the motor 10A, and the grip housing 23A is disposed rearward of the motor 10A.

[0036] The first battery mounting section 31A and the second battery mounting section 32A are each provided on the rear side of the controller housing 24. In this embodiment, the first battery mounting section 31A is disposed above the second battery mounting section 32A.

[0037] The first battery pack 33A is attached to the first battery mounting section 31A. The first battery pack 33A is attached to and detached from the first battery mounting section 31A.

[0038] The first battery mounting section 31A has a terminal. When the first battery pack 33A is mounted in the first battery mounting section 31A, a battery terminal serving as a connection terminal of the first battery pack 33A is connected to the terminal of the first battery mounting section 31A.

[0039] The second battery pack 34A is attached to the second battery attachment section 32A. The second battery pack 34A is attached to and detached from the second battery attachment section 32A.

[0040] The second battery mounting section 32A has a terminal. When the second battery pack 34A is mounted in the second battery mounting section 32A, a battery terminal which is a connection terminal of the second battery pack 34A is connected to the terminal of the second battery mounting section 32A.

[0041] Each of the first battery pack 33A and the second battery pack 34A functions as a power source for the impact wrench 1A. The first battery pack 33A includes a secondary battery. In this embodiment, the first battery pack 33A includes a rechargeable lithium ion battery. The second battery pack 34A includes a secondary battery. In this embodiment, the second battery pack 34A includes a rechargeable lithium ion battery. By being attached to the first battery mounting section 31A, the first battery pack 33A can supply power to the impact wrench 1A. By being attached to the second battery mounting section 32A, the second battery pack 34A can supply power to the impact wrench 1A. The motor 10A is driven based on the power supplied from each of the first battery pack 33A and the second battery pack 34A. The controller 11A operates based on the power supplied from each of the first battery pack 33A and the second battery pack 34A.

[0042] The rated voltage of the first battery pack 33A and the rated voltage of the second battery pack 34A are equal. The rated voltage of the first battery pack 33A and the rated voltage of the second battery pack 34A may be 18 V or 36 V. The outer shape and dimensions of the first battery pack 33A and the outer shape and dimensions of the second battery pack 34A are equal. That is, the first battery pack 33A and the second battery pack 34A are of the same type.

[0043] The structure and size of the terminals of the first battery mounting portion 31A and the structure and size of the terminals of the second battery mounting portion 32A are equal to each other.

[0044] 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.

[0045] 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 front-rear direction.

[0046] 3 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.

[0047] 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.

[0048] 2, the rotor 48 rotates about a motor rotation axis AX extending in the front-rear direction. The rotor 48 has a rotor core and a rotor magnet fixed to the rotor core.

[0049] 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.

[0050] 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 the motor rotation axis MX.

[0051] 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 front portion of the rotor shaft 49 that protrudes forward beyond the front end surface of the rotor 48. The rotor bearing 52 rotatably supports a rear portion of the rotor shaft 49 that protrudes rearward beyond the rear end surface of the rotor 48. The rotor bearing 51 is held in the gear housing 5.

[0052] A sun gear 55S is fixed to a front end portion 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.

[0053] 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.

[0054] The controller 11A is disposed rearward of the motor 10A.

[0055] The fan 12 generates an airflow for cooling the motor 10A and the controller 11A. The fan 12 is disposed on the front side of the stator 47. The fan 12 is fixed to the front part 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.

[0056] 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.

[0057] 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 accommodated in the gear housing 5.

[0058] The sun gear 55S is rotatable about a motor rotation shaft AX that extends in the front-rear direction. The sun gear 55S rotates as the rotor shaft 49 rotates.

[0059] 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 housing 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 housing 5. The internal gear 55I is always non-rotatable with respect to the gear housing 5.

[0060] 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.

[0061] The spindle 14 rotates due to 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 the motor rotation axis MX. At least a portion of the spindle 14 is disposed in front of the reduction mechanism 13A. The spindle 14 is disposed behind the anvil 16A.

[0062] The spindle 14 has a flange portion 14A, a spindle shaft portion 14B, and a protruding portion 14C. The spindle shaft portion 14B protrudes forward from the flange portion 14A. The protruding portion 14C protrudes rearward from the flange portion 14A.

[0063] 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 housing 5.

[0064] The impact mechanism 15A impacts the anvil 16A in the rotational direction around the motor rotation axis MX. The impact mechanism 15A is disposed on the front side of the motor 10A. The impact mechanism 15A is rotated by the rotor 48 of the motor 10A. The impact mechanism 15A is rotatable around the motor rotation axis MX. 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.

[0065] The striking mechanism 15A includes a hammer 71, a ball 72, a coil spring 73, and a washer .

[0066] 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 portion 71B provided at the front portion 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 forward from the rear surface of the hammer body 71A.

[0067] The hammer 71 is rotated by the motor 10A. The rotational force of the motor 10A is transmitted to the hammer 71 via the reduction gear mechanism 13A and the 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 around the motor rotation axis MX.

[0068] 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 on the front side of the washer 76.

[0069] The coil spring 73 is disposed around the spindle shaft portion 14B. The rear end of the coil spring 73 is supported by the flange portion 14A. The front end of the coil spring 73 is disposed inside the recess 71C and supported by a washer 76. The coil spring 73 constantly generates an elastic force that moves the hammer 71 forward.

[0070] 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 motor rotation axis MX and in a rotational direction about the motor rotation axis MX within a movable range defined by the spindle groove and the hammer groove.

[0071] The anvil 16A rotates around a motor rotation shaft MX extending in the front-rear direction. At least a portion of the anvil 16A is disposed in front of the hammer 71. The anvil 16A is struck in the rotational direction by the hammer 71 of the striking mechanism 15A. The front end of the spindle shaft portion 14B is disposed in an anvil recess provided in the rear end of the anvil 16A.

[0072] The anvil 16A has an anvil shaft portion 161 and an anvil protrusion portion 162. The anvil shaft portion 161 is disposed on the front side of the striking mechanism 15A. The anvil protrusion portion 162 protrudes from the rear end portion of the anvil shaft portion 161 radially outward of the anvil shaft portion 161. The anvil protrusion portion 162 is struck by the striking mechanism 15A in the rotational direction about the motor rotation shaft MX.

[0073] 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 around the motor rotation shaft MX. 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 lubricating oil.

[0074] A rear end of the intermediate shaft 95 is splined to the anvil 16A. The intermediate shaft 95 rotates together with the anvil 16A about the motor rotation axis MX. A rear portion of the intermediate shaft 95 is rotatably supported by a shaft bearing 56. A front portion of the intermediate shaft 95 is rotatably supported by a shaft bearing 57. A spacer 77 is disposed between the shaft bearing 56 and the shaft bearing 57.

[0075] A bevel gear 53 is provided at the front end of the intermediate shaft 95. A bevel gear 54 is fixed to the output shaft 20A. The bevel gear 53 and the bevel gear 54 mesh with each other.

[0076] The output shaft 20A is rotatable about an output rotation axis AX extending in the vertical direction. The output shaft 20A is rotatably supported by a shaft bearing 59. The rotational force of the intermediate shaft 95 is transmitted to the output shaft 20A via the bevel gears 53 and 54. The rotation of the intermediate shaft 95 rotates the output shaft 20A.

[0077] When the hammer 71 strikes the anvil 16A, the striking force from the hammer 71 input to the anvil 16A is transmitted to the output shaft 20A via the intermediate shaft 95. The output shaft 20A is struck by the striking mechanism 15A via the intermediate shaft 95 and the anvil 16A.

[0078] The lower end of the output shaft 20A is disposed below the gear housing 5 through an opening provided in the lower front part of the gear housing 5. A socket is attached as a tool tip to the lower end of the output shaft 20A.

[0079] FIG. 4 is a diagram showing a schematic diagram of an output shaft 20A according to the first embodiment. A socket is attached to the lower end (tip) of the output shaft 20A. The tip of the output shaft 20A to which the socket is attached is substantially rectangular prism-shaped. The output shaft 20A is formed so that a distance Db between a first side and a second side of the tip of the output shaft 20A, which face each other across the output 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 output rotation axis AX. The distance Db may be regarded as the length of one side of the output shaft 20A in a plane perpendicular to the output rotation axis AX.

[0080] 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 231. The motor 10A is driven by operating the trigger switch 17A to move it upward. The driving of the motor 10A is stopped by releasing the operation of the trigger switch 17A.

[0081] <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 output shaft 20A. After the socket is attached to the output shaft 20A, the operator grips the grip housing 23A with his / her hand and operates the trigger switch 17A so that the trigger switch 17A moves upward. When the trigger switch 17A is operated, power is supplied from the first battery pack 33A and the second battery pack 34A 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.

[0082] When the spindle 14 rotates while the hammer protrusion 71B and the anvil protrusion 162 are in contact with each other, the anvil 16A rotates together with the hammer 71 and the spindle 14. When the anvil 16A rotates, the intermediate shaft 95 and the output shaft 20A each rotate, and the fastening operation progresses.

[0083] When a load equal to or greater than a predetermined value acts on the anvil 16A via the output shaft 20A and the intermediate shaft 95 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 backward. As the hammer 71 moves backward, the contact between the hammer protrusion 71B and the anvil protrusion 162 is released. The hammer 71 that has moved backward moves forward while rotating due to the elastic force of the coil spring 73. 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 around the motor rotation axis MX with high torque, and the output shaft 20A rotates around the output rotation axis AX with high torque. Therefore, the bolt or nut is fastened with high torque.

[0084] <Specifications> In this embodiment, the maximum tightening torque of the output shaft 20A is 500 Nm or more. The maximum tightening torque of the output shaft 20A may be 500 Nm or more and less than 1000 Nm.

[0085] The specifications of the impact wrench 1A according to this embodiment are as follows.

[0086] Maximum tightening torque of output shaft: 500Nm or more but less than 1000Nm - Total rated voltage of battery pack: 18V Stator core outer diameter Da: 50mm Maximum motor power: 400W Output shaft speed (no load): 2000 rpm - Impact mechanism stroke rate: 2500 rpm Reduction ratio of reduction mechanism: 1 / 9 Hammer weight: 320g Distance between the first and second sides of the output shaft tip Db: 1 / 2 inch External dimensions of impact wrench without battery pack: Front-to-back 538mm x Left-to-right 128mm x Up-to-down 223mm Weight of impact wrench without battery pack: 3kg

[0087] One or more battery packs having a rated voltage of 18 V may be attached to the impact wrench 1A so that the sum of the rated voltages of the battery packs is equal to or greater than 18 V. In this embodiment, a first battery pack 33A and a second battery pack 34A having a rated voltage of 18 V are attached to the impact wrench 1A, and the sum of the rated voltages of the battery packs is 36 V.

[0088] <Effects> As described above, in the embodiment, the impact wrench 1A includes the motor 10A, which is a brushless motor having the stator 47 and the rotor 48 that rotates around the motor rotation axis MX relative to the stator 27, the impact mechanism 15A rotated by the rotor 48, the output shaft 20A that is struck by the impact mechanism 15A and rotates around the output rotation axis AX, the motor housing 21 that houses the motor 10A, and the battery mounting section (31A, 31B) to which the battery pack (33A, 34A) is attached. In the front-rear direction perpendicular to the output rotation axis AX, the impact mechanism 15A and the output shaft 20A are disposed forward of the motor 10A. The maximum tightening torque of the output shaft 20A is 500 Nm or more and less than 1000 Nm.

[0089] In the above configuration, the output shaft 20A of the impact wrench 1A has a high torque.

[0090] In the embodiment, the sum of the rated voltages of the battery packs is 18V or more. The outer diameter Da of the stator core 47A is 50mm or more. The maximum output of the motor 10A is 400W or more. The rotation speed of the output shaft 20A after being decelerated by the reduction mechanism 13A is 1000 rpm or more and 4000 rpm or less. The impact rate of the impact mechanism 15A is 1250 rpm or more and 5000 rpm or less. The weight of the hammer 71 of the impact mechanism 15A is 160g or more and 640g or less. The reduction ratio of the reduction mechanism 13A is 1 / 18.0 or more and 1 / 4.5 or less. The distance Db between the first side and the second side of the tip portion of the output shaft 20A facing each other is 1 / 2 inch or more and 2.5 inch or less.

[0091] In the above configuration, the maximum tightening torque of the output shaft 20A can be made 500 Nm or more.

[0092] [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.

[0093] <Impact wrench> 5 is a side 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.

[0094] The impact wrench 1B includes a main housing 2B including a grip housing 23B, a battery mounting section 31B, a motor 10B, a controller 11B, a speed reduction mechanism 13B, an impact mechanism 15B, an output shaft 20B, and a trigger switch 17B.

[0095] In this embodiment, the impact wrench 1B has one battery mounting portion 31B. A battery pack 33B is mounted to the battery mounting portion 31B. The battery pack 33B is detachably attached to the battery mounting portion 31B.

[0096] The rated voltage of the battery pack 33B may be 18V, 36V, or 72V.

[0097] <Specifications> In this embodiment, the maximum tightening torque of the output shaft 20B is 500 Nm or more. The maximum tightening torque of the output shaft 20B may be 500 Nm or more and less than 1000 Nm.

[0098] The specifications of the impact wrench 1B according to this embodiment are as follows.

[0099] Maximum tightening torque of output shaft: 500Nm or more but less than 1000Nm - Total rated voltage of battery pack: 18V Stator core outer diameter Da: 50mm Maximum motor power: 400W Output shaft speed (no load): 2000 rpm - Impact mechanism stroke rate: 2500 rpm Reduction ratio of reduction mechanism: 1 / 9 Hammer weight: 320g Distance between the first and second sides of the output shaft tip Db: 1 / 2 inch External dimensions of impact wrench without battery pack: Front-to-back 538mm x Left-to-right 128mm x Up-to-down 223mm Weight of impact wrench without battery pack: 3kg

[0100] One or more battery packs having a rated voltage of 18 V may be attached to the impact wrench 1B so that the sum of the rated voltages of the battery packs is equal to or greater than 18 V. In this embodiment, a battery pack 33B having a rated voltage of 18 V is attached to the impact wrench 1B, and the sum of the rated voltages of the battery packs is 18 V.

[0101] [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.

[0102] <Impact wrench> 6 is a side 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.

[0103] The impact wrench 1C includes a main body housing 2C including a grip housing 23C, a battery mounting section 31C, a motor 10C, a controller 11C, a speed reduction mechanism 13C, an impact mechanism 15C, an output shaft 20C, and a trigger switch 17C.

[0104] In this embodiment, the impact wrench 1C has one battery mounting section 31C. A battery pack 33C is mounted to the battery mounting section 31C. The battery pack 33C is detachably attached to the battery mounting section 31C.

[0105] The rated voltage of the battery pack 33C may be 18V, 36V, or 72V.

[0106] <Specifications> In this embodiment, the maximum tightening torque of the output shaft 20C is 1000 Nm or more. The maximum tightening torque of the output shaft 20C may be 1000 Nm or more and less than 1500 Nm.

[0107] The specifications of the impact wrench 1C according to this embodiment are as follows.

[0108] Maximum tightening torque of output shaft: 1000Nm or more but less than 1500Nm - Total rated voltage of battery pack: 18V Stator core outer diameter Da: 50mm Maximum motor power: 500W Output shaft speed (no load): 1600 rpm - Impact mechanism stroke rate: 2200 rpm Reduction ratio of reduction mechanism: 1 / 10 Hammer weight: 620g Distance between the first and second sides of the output shaft tip Db: 1 / 2 inch External dimensions of impact wrench without battery pack: Front-to-back 538mm x Left-to-right 128mm x Up-to-down 223mm Weight of impact wrench without battery pack: 4kg

[0109] One or more battery packs having a rated voltage of 18 V may be attached to the impact wrench 1C so that the sum of the rated voltages of the battery packs is equal to or greater than 18 V. In this embodiment, a battery pack 33C having a rated voltage of 72 V (maximum 80 V) is attached to the impact wrench 1C, and the sum of the rated voltages of the battery packs is 72 V.

[0110] <Effects> As described above, in the embodiment, the rated voltage of the battery pack 33C is 18V or more. The outer diameter of the stator core is 50mm or more. The maximum output of the motor 10C, which is a brushless motor, is 500W or more. The rotation speed of the output shaft 20C after being decelerated by the reduction gear mechanism 13C is 1600rpm. The impact rate of the impact mechanism 15C is 2200rpm. The weight of the hammer of the impact mechanism 15C is 620g. The reduction ratio of the reduction gear mechanism 13C is 1 / 10. The distance Db between the first side and the second side of the tip portion of the output shaft 20C facing each other is 1 / 2 inch or more and 1 inch or less.

[0111] In the above configuration, the maximum tightening torque of the output shaft 20C can be made 1000 Nm or more.

[0112] [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.

[0113] <Impact wrench> FIG. 7 is a side view showing an impact wrench 1D according to the fourth embodiment.

[0114] The impact wrench 1D includes a main body housing 2D including a grip housing 23D, a battery mounting section 31D, a motor 10D, a controller 11D, a speed reduction mechanism 13D, an impact mechanism 15D, an anvil 16D that functions as an output shaft, and a trigger switch 17D.

[0115] In this embodiment, the rotor of the motor 10D rotates around a motor rotation axis MX extending in the vertical direction. The anvil 16D, which is an output shaft, rotates around an output rotation axis AX extending in the vertical direction. In other words, the motor rotation axis MX and the output rotation axis AX are substantially parallel. The striking mechanism 15A and the anvil 16D are disposed forward of the motor 10A. The grip housing 23D is disposed rearward of the motor 10D. A socket is attached to the lower end of the anvil 16D.

[0116] In this embodiment, the impact wrench 1D has one battery mounting part 31D. The battery mounting part 31D is disposed at the rear of the grip housing 23D. A battery pack 33D is mounted to the battery mounting part 31D. The battery pack 33C is detachably attached to the battery mounting part 31C.

[0117] The rated voltage of the battery pack 33D may be 18V, 36V, or 72V.

[0118] <Specifications> In this embodiment, the maximum tightening torque of the anvil 16D, which is the output shaft, is 1500 Nm or more. The specifications of the impact wrench 1D according to this embodiment are as follows.

[0119] Maximum tightening torque of output shaft: 1500Nm or more and less than 3000Nm - Total rated voltage of battery pack: 18V Stator core outer diameter Da: 50mm Maximum motor power: 650W Output shaft speed (no load): 1800 rpm - Impact mechanism stroke rate: 2500 rpm Reduction ratio of reduction mechanism: 1 / 15 Hammer weight: 530g Distance between the first and second sides of the anvil tip Db: 3 / 4 inch Weight of impact wrench without battery pack: 5kg

[0120] One or more battery packs having a rated voltage of 18 V may be attached to the impact wrench 1D so that the sum of the rated voltages of the battery packs is equal to or greater than 18 V. In this embodiment, a battery pack 33D having a rated voltage of 36 V (maximum 40 V) is attached to the impact wrench 1D, and the sum of the rated voltages of the battery packs is 36 V.

[0121] The following is also an invention. a motor that rotates around a first rotation shaft (motor rotation shaft) that extends in the vertical direction; a spindle that is rotated by the motor and rotates about a second rotation axis (output rotation axis) that is parallel to the first rotation axis; a hammer held by the spindle; and an anvil that is struck by the hammer, The anvil is disposed forward of the motor, an impact tool.

[0122] In the example shown in FIG. 7, the rotation from the rotor of the motor 10D is input to a reduction mechanism 13D, which is a type of gear mechanism. The impact mechanism 15D rotates based on the rotation input from the gear mechanism. The rotational force of the motor 10D is transmitted in the order of the gear mechanism, the impact mechanism 15D, and the anvil 16D. Since no impact is applied to the gear mechanism, damage to the gear mechanism is suppressed and the gear mechanism can handle high torque. In the example shown in FIG. 7, the gear mechanism is a reduction mechanism that reduces the rotation of the motor, but it may be an acceleration mechanism that increases the rotation of the motor.

[0123] <Effects> As described above, the rated voltage of the battery pack 33D is 18V or more. The outer diameter of the stator core is 50mm or more. The maximum output of the motor 10D, which is a brushless motor, is 650W or more. The rotation speed of the anvil 16D, which is the output shaft, is 1800rpm. The impact speed of the impact mechanism 15D is 2500rpm. The weight of the hammer of the impact mechanism 15D is 530g. The reduction ratio of the reduction mechanism 13D is 1 / 15. The distance between the first and second sides of the tip portions of the anvil 16D facing each other is 3 / 4 inches or more.

[0124] In the above configuration, the maximum tightening torque of the anvil 16D, which is the output shaft, can be made 1500 Nm 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] 8 is a side view showing an impact wrench 1E according to a fifth embodiment. The impact wrench 1E according to this embodiment is a modified example of the impact wrench 1A according to the above-mentioned first embodiment.

[0127] The impact wrench 1E comprises a main body housing 2E including a grip housing 23E, a first battery mounting section 31E to which a first battery pack 33E is attached, a second battery mounting section 32E to which a second battery pack 34E is attached, a motor 10E, a controller 11E, a reduction mechanism 13E, an impact mechanism 15E, an output shaft 20E, and a trigger switch 17E.

[0128] In this embodiment, the rotor of the motor 10E rotates around a motor rotation axis MX extending in the front-rear direction. A bevel gear 53E is provided at the front of a rotor shaft 49E of the motor 10E. The reduction mechanism 13E has a bevel gear 54E that meshes with the bevel gear 53E. The reduction mechanism 13E, the impact mechanism 15E, and the output shaft 20E are each disposed forward of the motor 10E. The reduction mechanism 13E, the impact mechanism 15E, and the output shaft 20E each rotate around an output rotation axis AX extending in the up-down direction. The output shaft 20E is an anvil that is impacted by the impact mechanism 15E. A socket is attached to the lower end of the output shaft 20E.

[0129] In this embodiment, the sum of the rated voltages of the battery packs is 18V or more. The outer diameter Da of the stator core is 50mm or more. The maximum output of the motor 10E is 400W or more. The rotation speed of the output shaft 20E after being decelerated by the reduction gear mechanism 13E is 2000rpm. The impact speed of the impact mechanism 15E is 2500rpm. The weight of the hammer of the impact mechanism 15E is 320g. The reduction ratio of the reduction gear mechanism 13E is 1 / 9. The distance Db between the first side and the second side of the tip of the output shaft 20E facing each other is 1 / 2 inch or more. In this embodiment as well, the maximum tightening torque of the output shaft 20E is 500Nm or more.

[0130] In the example shown in FIG. 8, the rotation from the rotor of the motor 10E is input to a reduction mechanism 13E, which is a type of gear mechanism. The impact mechanism 15E rotates based on the rotation input from the gear mechanism. The rotational force of the motor 10E is transmitted in the order of the gear mechanism, the impact mechanism 15E, and the output shaft 20E. Since no impact is applied to the gear mechanism, damage to the gear mechanism is suppressed and it is possible to handle high torque. Also, in the example shown in FIG. 8, the length of the impact wrench 1E in the front-rear direction can be shortened.

[0131] [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.

[0132] FIG. 9 is a diagram illustrating an impact wrench 1F according to the sixth embodiment.

[0133] The impact wrench 1F includes a motor 10F, a reduction mechanism 13F, a striking mechanism 15F, and an anvil 16F which is an output shaft.

[0134] In this embodiment, the rotor of the motor 10F rotates around the motor rotation axis MX extending in the front-rear direction. The reduction mechanism 13F is disposed forward of the motor 10F. The reduction mechanism 13F includes a bevel gear 53F and a bevel gear 54F meshing with the bevel gear 53F. The bevel gear 54F is disposed above a portion of the bevel gear 53F. The bevel gear 54F is disposed above the motor rotation axis MX. The reduction mechanism 13F is disposed rearward of the impact mechanism 15F. The rotation of the bevel gear 54F is transmitted to the impact mechanism 15F. The impact mechanism 15F and the anvil 16F are disposed forward of the reduction mechanism 13F. The impact mechanism 15F and the anvil 16F rotate around the output rotation axis AX extending in the up-down direction. The anvil 16F is struck by the impact mechanism 15F in a rotational direction around the output rotation axis AX. A socket is attached to the lower end of the anvil 16F.

[0135] Although not shown, the impact wrench 1F has a battery mounting portion to which a battery pack is attached, as in the above-described embodiment. In both this embodiment and this embodiment, the maximum tightening torque of the anvil 16F is 500 Nm or more.

[0136] In this embodiment, the bevel gear 54F is disposed above the motor shaft MX, so that a space is secured in which the hammer of the impact mechanism 15F can move vertically, thereby shortening the vertical length of the impact wrench 1F.

[0137] [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.

[0138] FIG. 10 is a cross-sectional view showing a part of an impact driver 1G according to a seventh embodiment. The impact driver 1G is an angle impact driver, which is a type of angle impact tool. The impact driver 1G has an output shaft 20G having a bit hole 200 into which a driver bit is inserted. The output shaft 20G rotates about an output rotation axis AX extending in the vertical direction. The output shaft 20G is rotatably supported by a bearing 59G. A bit holding mechanism 201 is provided on the output shaft 20G. The bit holding mechanism 201 holds the driver bit inserted in the bit hole 200.

[0139] A bevel gear 54G is fixed to the output shaft 20G. The bevel gear 54G meshes with the bevel gear 53G. The rotational force of the motor 10G is transmitted to the output shaft 20G via the reduction mechanism 13G, the impact mechanism 15G, the bevel gear 53G, and the bevel gear 54G. The structure other than the output shaft 20G is the same as that of the impact wrench 1A according to the first embodiment described above.

[0140] In this embodiment as well, the maximum tightening torque of the output shaft 20G is 500 Nm or more.

[0141] [Relationship between the rated voltage of the battery pack, the outer diameter of the stator, and the maximum tightening torque] Fig. 11 is a diagram showing the relationship between the rated voltage and the outer diameter of the stator core of the battery pack according to the embodiment, and the maximum tightening torque of the output shaft. As shown in Fig. 11, when the sum of the rated voltages of the battery pack is 18 V or more and the outer diameter of the stator core is 50 mm or more, the maximum tightening torque of the output shaft can be 500 Nm or more.

[0142] [Other embodiments] 12 is a diagram showing an impact wrench 1H according to another embodiment. The impact wrench 1H includes a main body housing 2H, a first grip portion 231H fixed to the main body housing 2H, a second grip portion 232H arranged rearward from the first grip portion 231H, a third grip portion 233H arranged rearward from the second grip portion 232H, a motor 10H accommodated in the main body housing 2H, a controller 11H arranged rearward from the motor 10H, a speed reduction mechanism 13H arranged forward from the motor 10H, a striking mechanism 15H arranged forward from the speed reduction mechanism 13H, an anvil 16H functioning as an output shaft struck in the rotational direction by the striking mechanism 15H, and a trigger switch 17H provided on the third grip portion 233H.

[0143] The impact wrench 1H also includes a first battery mounting portion 31H to which a first battery pack 33H is attached, and a second battery mounting portion 32H to which a second battery pack 34H is attached.

[0144] The first grip portion 231H is provided so as to protrude upward from the front portion of the main body housing 2H. The first grip portion 231H is loop-shaped. The second grip portion 232H is provided so as to protrude upward from the center portion of the main body housing 2H in the front-rear direction. The second grip portion 232H is loop-shaped. The third grip portion 233H is provided so as to protrude rearward from the rear portion of the main body housing 2H. The third grip portion 233H is loop-shaped. A lower end portion of the second grip portion 232H and a front end portion of the third grip portion 233H are connected.

[0145] An operator can perform the tightening operation, for example, while gripping the first grip portion 231H or the second grip portion 232H with the right hand and gripping the third grip portion 233H with the left hand.

[0146] The specifications of the impact wrench 1H according to this embodiment are as follows.

[0147] Maximum tightening torque of output shaft: 3000Nm - Total rated voltage of battery pack: 36V Stator core outer diameter Da: 80mm Maximum motor power: 650W Output shaft speed (no load): 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 560mm x Left-to-right 240mm x Up-to-down 350mm Weight of impact wrench without battery pack: 10kg

[0148] 13 is a diagram showing an impact wrench 1J according to another embodiment. The impact wrench 1J includes a main body housing 2J, a grip housing 23J fixed to the main body housing 2H, a motor 10J accommodated in the main body housing 2J, a controller 11J arranged rearward of the motor 10J, a speed reduction mechanism 13J arranged forward of the motor 10J, a striking mechanism 15J arranged forward of the speed reduction mechanism 13J, an anvil 16J functioning as an output shaft struck in the rotational direction by the striking mechanism 15J, and a trigger switch 17J provided in the grip housing 23J.

[0149] The main body housing 2J has a motor housing section 2J1 and a controller housing section 2J2 arranged on the rear side of the motor housing section 2J1. The grip housing 23J includes a first section 23J1 extending upward from the right side of the motor housing section 2J1, a second section 23J2 extending leftward from the upper end of the first section 23J1, a third section 23J3 extending rearward from the left end of the second section 23J2, and a fourth section 23J4 extending downward from the rear end of the third section 23J3. The fourth section 23J4 is arranged rearward of the controller housing section 2J2.

[0150] An operator can perform the tightening operation, for example, while holding the first portion 23J1 or the second portion 23J2 with the right hand and holding the fourth portion 23J2 with the left hand.

[0151] The impact wrench 1H also includes a battery mounting portion 31J to which a battery pack 33J is attached.

[0152] The specifications of the impact wrench 1J according to this embodiment are as follows.

[0153] Maximum tightening torque of output shaft: 7500Nm - Total rated voltage of battery pack: 72V Stator core outer diameter Da: 80mm Maximum motor power: 650W Output shaft speed (no load): 760 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 560mm x Left-to-right 240mm x Up-to-down 350mm Weight of impact wrench without battery pack: 20kg

[0154] The specifications of the impact wrench 1J may be as follows.

[0155] Maximum tightening torque of output shaft: 7500Nm or more - Total rated voltage of battery pack: 72V Stator core outer diameter Da: 80mm Maximum motor power: 650W Output shaft speed (no load): 1150 rpm - Impact mechanism stroke rate: 1500 rpm Reduction ratio of reduction mechanism: 1 / 26.3 Hammer weight: 2.0kg 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 560mm x Left-to-right 240mm x Up-to-down 350mm Weight of impact wrench without battery pack: 20kg

[0156] 14 is a diagram showing an impact wrench 1K according to another embodiment. The impact wrench 1K includes a main body housing 2K, a first grip part 231K and a second grip part 232K fixed to the main body housing 2K, a third grip part 233K fixed to the main body housing 2K, a motor 10K accommodated in the main body housing 2K, a controller 11K arranged above the motor 10K, a speed reduction mechanism 13K arranged forward of the motor 10K, a striking mechanism 15K arranged forward of the speed reduction mechanism 13K, an anvil 16K functioning as an output shaft struck in the rotational direction by the striking mechanism 15K, and a trigger switch 17K provided on the first grip part 231K. A socket 100 is attached to the lower end of the anvil 16K.

[0157] The impact wrench 1K also includes a battery mounting section 31K to which a battery pack 33K is attached. The battery mounting section 31K is disposed on the upper portion of the main body housing 2K.

[0158] The impact wrench 1K also has a base 300 that supports the main housing 2K, and wheels 301 that support the base 300. The wheels 301 run on the rails on which the railroad car runs. The impact wrench 1K is used, for example, to fasten bolts or nuts that secure sleepers.

[0159] The specifications of the impact wrench 1K according to this embodiment are as follows.

[0160] Maximum tightening torque of output shaft: 7500Nm - Total rated voltage of battery pack: 75V Stator core outer diameter Da: 80mm Maximum motor power: 650W Output shaft speed (no load): 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 1500mm x Left-to-right 590mm x Up-to-down 800mm Weight of impact wrench without battery pack: 20kg

[0161] Fig. 15 is a schematic diagram showing a part of an angle impact tool 1L according to another embodiment. In each of the above-mentioned embodiments, the trigger switch (17A, etc.) and the controller (11A, etc.) are separate. As shown in Fig. 15, the trigger switch 17L and the controller 11L may be integrated. The trigger switch 17L is connected to a switch body 170. The switch body 170 is integrated with the controller 11L. The trigger switch 17L, the switch body 170, and the controller 11L are integrated.

[0162] 16 is a diagram showing a motor 10M according to another embodiment of the present invention. An FET 102 for switching the drive current supplied to the motor 10M may be disposed on a substrate 101 integral with the motor 10M.

[0163] Fig. 17 is a diagram showing a part of an angle impact tool 1N according to another embodiment. As shown in Fig. 17, a switch panel 103 may be arranged in a part of the angle impact tool 1N. The switch panel 103 is arranged in at least a part of the main body housing (2A, etc.). The rotation speed of the motor may be changed by operating a switch 104 provided on the switch panel 103. For example, in the example shown in Fig. 1, the switch panel 103 may be arranged on the upper part of the main body housing 2A. [Explanation of symbols]

[0164] 1A...Impact wrench, 1B...Impact wrench, 1C...Impact wrench, 1D...Impact wrench, 1E...Impact wrench, 1F...Impact wrench, 1G...Impact driver, 1H...Impact wrench, 1J...Impact wrench, 1K...Impact wrench, 2A...Main body housing, 2B...Main body housing, 2C...Main body housing, 2D...Main body housing, 2E...Main body housing, 2H...Main body housing, 2J...Main body housing, 2K...Main body housing, 5...Gear housing, 7...Handle, 10A...Motor, 10B...Motor, 10C...Motor motor, 10D...motor, 10E...motor, 10F...motor, 10G...motor, 10H...motor, 10J...motor, 10K...motor, 11A...controller, 11B...controller, 11C...controller, 11D...controller, 11E...controller, 11H...controller, 11J...controller, 11K...controller, 12...fan, 13A...reduction mechanism, 13B...reduction mechanism, 13C...reduction mechanism, 13D...reduction mechanism, 13E...reduction mechanism, 13F...reduction mechanism, 13G...reduction mechanism, 13H...reduction mechanism, 13J...reduction mechanism, 13K...reduction mechanism, 14... Spindle, 14A...flange portion, 14B...spindle shaft portion, 14C...protrusion, 15A...striking mechanism, 15B...striking mechanism, 15C...striking mechanism, 15D...striking mechanism, 15E...striking mechanism, 15F...striking mechanism, 15G...striking mechanism, 15H...striking mechanism, 15J...striking mechanism, 15K...striking mechanism, 16A...anvil, 16D...anvil, 16F...anvil, 16H...anvil, 16J...anvil, 16K...anvil, 17A...trigger switch, 17B...trigger switch, 17C...trigger switch, 17D...trigger switch, 17E...trigger switch, 17H... Trigger switch, 17J...trigger switch, 17K...trigger switch, 20A...output shaft, 20B...output shaft, 20C...output shaft, 20E...output shaft, 20G...output shaft, 21...motor housing, 23A...grip housing, 23B...grip housing, 23C...grip housing, 23D...grip housing, 23E...grip housing, 23J...grip housing, 24...controller housing, 31A...first battery mounting section, 31B...battery mounting section, 31C...battery mounting section, 31D...battery mounting section,31E...first battery mounting section, 31H...first battery mounting section, 31J...battery mounting section, 31K...battery mounting section, 32A...second battery mounting section, 32E...second battery mounting section, 32H...second battery mounting section, 33A...first battery pack, 33B...battery pack, 33C...battery pack, 33D...battery pack, 33E...first battery pack, 33H...first battery pack, 33J...battery pack, 33K...battery pack, 34A... Second battery pack, 34E...second battery pack, 34H...second battery pack, 47...stator, 47A...stator core, 47B...coil, 48...rotor, 49...rotor shaft, 49E...rotor shaft, 50...sensor board, 51...rotor bearing, 52...rotor bearing, 53...bevel gear, 53E...bevel gear, 53F...bevel gear, 53G...bevel gear, 54...bevel gear, 54E...bevel gear, 54F...bevel gear, 54G...bevel gear, 55...planetary gear mechanism, 55A...pin, 55I...internal gear, 55P...planetary gear, 55S...sun gear, 56...shaft bearing, 57...shaft bearing, 58...spindle bearing, 59...shaft bearing, 59G...bearing, 71...hammer, 71A...hammer body, 71B...hammer protrusion, 71C...recess, 72...ball, 73...coil spring, 76...washer, 77...spacer, 78...ball, 79...anvil bearing, 95...intermediate shaft, 100 ...Socket, 161...Anvil shaft portion, 162...Anvil protrusion portion, 200...Bit hole, 201...Bit holding mechanism, 231...First grip portion, 231H...First grip portion, 231K...First grip portion, 232...Second grip portion, 232H...Second grip portion, 232K...Second grip portion, 233H...Third grip portion, 233K...Third grip portion, 300...Pedestal, 301...Wheel, Da...Outer diameter, Db...Distance, MX...Motor rotating shaft, AX...Output rotating shaft.

Claims

1. a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis; a striking mechanism rotated by the rotor; an output shaft that is struck by the striking mechanism and rotates about a second rotation axis; a motor housing that accommodates the brushless motor; a battery mounting section to which a battery pack is mounted, the impact mechanism and the output shaft are disposed forward of the brushless motor in a front-rear direction perpendicular to the second rotation shaft, the front-rear direction and the output shaft are perpendicular to each other, The maximum tightening torque of the output shaft is 500 Nm or more and less than 1000 Nm. Angle impact tool.

2. The rated voltage of the battery pack is 18 V or more, The outer diameter of the stator is 50 mm or more. The angle impact tool according to claim 1 .

3. The maximum output of the brushless motor is 400 W or more. The angle impact tool 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 output shaft is 1000 rpm or more and 4000 rpm or less. The angle impact tool according to claim 1 .

5. The impact rate of the impact mechanism is 1250 rpm or more and 5000 rpm or less. The angle impact tool according to claim 1 .

6. The weight of the hammer of the striking mechanism is 160 g or more and 640 g or less. The angle impact tool 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 / 18.0 or more and 1 / 4.5 or less. The angle impact tool according to claim 1 .

8. The tip of the output shaft to which the socket is attached is in the shape of a square pillar, the distance between the first and second sides of the tip end portions of the output shafts facing each other is between ½ inch and 2.5 inches; The angle impact tool according to claim 1 .

9. a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis; a striking mechanism rotated by the rotor; an output shaft that is struck by the striking mechanism and rotates about a second rotation axis; a motor housing that accommodates the brushless motor; a battery mounting section to which a battery pack is mounted, the impact mechanism and the output shaft are disposed forward of the brushless motor in a front-rear direction perpendicular to the second rotation shaft, the front-rear direction and the output shaft are perpendicular to each other, The maximum tightening torque of the output shaft is 1000 Nm or more and less than 1500 Nm. Angle impact tool.

10. The rated voltage of the battery pack is 18 V or more, The outer diameter of the stator is 50 mm or more.

10. The angle impact tool according to claim 9.

11. The maximum output of the brushless motor is 500 W or more.

10. The angle impact tool according to claim 9.

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 output shaft is 800 rpm or more and 3200 rpm or less.

10. The angle impact tool according to claim 9.

13. The impact rate of the impact mechanism is 1100 rpm or more and 4400 rpm or less.

10. The angle impact tool according to claim 9.

14. The weight of the hammer of the striking mechanism is 310 g or more and 1240 g or less.

10. The angle impact tool according to claim 9.

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 / 20.0 or more and 1 / 5.0 or less.

10. The angle impact tool according to claim 9.

16. The tip of the output shaft to which the socket is attached is in the shape of a square pillar, the distance between the first and second sides of the tip end portions of the output shafts facing each other is between ½ inch and 2.5 inches; 10. The angle impact tool according to claim 9.

17. a brushless motor having a stator and a rotor that rotates relative to the stator about a first rotation axis; a striking mechanism rotated by the rotor; an output shaft that is struck by the striking mechanism and rotates about a second rotation axis; a motor housing that accommodates the brushless motor; a battery mounting section to which a battery pack is mounted, the impact mechanism and the output shaft are disposed forward of the brushless motor in a front-rear direction perpendicular to the second rotation shaft, the front-rear direction and the output shaft are perpendicular to each other, The maximum tightening torque of the output shaft is 1500 Nm or more and less than 3000 Nm. Angle impact tool.

18. The rated voltage of the battery pack is 18 V or more, The outer diameter of the stator is 50 mm or more.

18. An angle impact tool according to claim 17.

19. The maximum output of the brushless motor is 650 W or more.

18. An angle impact tool according to 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 output shaft is 900 rpm or more and 3600 rpm or less.

18. An angle impact tool according to claim 17.

21. The impact rate of the impact mechanism is 1250 rpm or more and 5000 rpm or less.

18. An angle impact tool according to claim 17.

22. The weight of the hammer of the striking mechanism is 265 g or more and 1060 g or less.

18. An angle impact tool according to 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 / 30.0 or more and 1 / 7.5 or less.

18. An angle impact tool according to claim 17.

24. The tip of the output shaft to which the socket is attached is in the shape of a square pillar, the distance between the first and second sides of the tip end portions of the output shafts facing each other is not less than 3 / 4 inches and not more than 2.5 inches; 18. An angle impact tool according to claim 17.

25. a gear mechanism to which rotation from the impact mechanism is input, The output shaft rotates based on the rotation input from the gear mechanism. An angle impact tool according to any one of claims 1, 9 and 17.

26. a gear mechanism to which rotation from the rotor is input, the impact mechanism rotates based on the rotation input from the gear mechanism; An angle impact tool according to any one of claims 1, 9 and 17.

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