Impact wrench

Abstract

To suppress reduction in work efficiency.SOLUTION: An impact wrench includes: a brushless motor; a striking mechanism rotated by the brushless motor; an anvil that is struck by the striking mechanism and rotates about a rotation axis extending in a direction parallel to the first axis; a first battery mounting portion on which a first battery pack is mounted; and a second battery mounting portion which is disposed at a position different from that of the first battery mounting portion in a direction parallel to the first axis, and on which a second battery pack is mounted.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In the technical field related to impact wrenches, impact wrenches driven by power supplied from a battery pack, as disclosed in Patent Document 1, are known. Also, there are multiple known electric tools.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to increase the output of an impact wrench, it may be considered to mount a plurality of battery packs on the impact wrench. Depending on the mounting form of the battery packs, the work efficiency may decrease. Similarly, the work efficiency may decrease in other electric tools.

[0005] The technology disclosed in this specification aims to suppress a decrease in work efficiency when at least two battery packs are mounted on an impact wrench or an electric tool.

Means for Solving the Problems

[0006] This specification discloses an impact wrench and a power tool. The impact wrench may include a brushless motor, an impact mechanism rotated by the brushless motor, an anvil that is struck by the impact mechanism and rotates about a rotation axis extending in a direction parallel to a first axis, a first battery mounting section on which a first battery pack is mounted, and a second battery mounting section located at a different position from the first battery mounting section in a direction parallel to the first axis, on which a second battery pack is mounted. [Effects of the Invention]

[0007] According to the technology disclosed herein, when an impact wrench is equipped with at least two battery packs, a decrease in work efficiency can be suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing an impact wrench according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view showing an impact wrench according to the first embodiment. [Figure 3] Figure 3 is a top view showing an impact wrench according to the first embodiment. [Figure 4] Figure 4 is a perspective view showing an impact wrench according to the second embodiment. [Figure 5] Figure 5 is a side view showing an impact wrench according to the third embodiment. [Figure 6] Figure 6 is a side view showing an impact wrench according to the fourth embodiment. [Figure 7] Figure 7 is a side view showing an impact wrench according to the fifth embodiment. [Figure 8] Figure 8 shows an impact wrench according to the sixth embodiment. [Figure 9] Figure 9 is a plan view showing an impact wrench according to the sixth embodiment. [Figure 10] Figure 10 shows an impact wrench according to the seventh embodiment. [Modes for carrying out the invention]

[0009] In one or more embodiments, the impact wrench may include a brushless motor, an impact mechanism rotated by the brushless motor, an anvil struck by the impact mechanism and rotating about a rotation axis extending in a direction parallel to a first axis, a first battery mounting section on which a first battery pack is mounted, and a second battery mounting section located at a different position from the first battery mounting section in a direction parallel to the first axis, on which a second battery pack is mounted.

[0010] The above configuration helps to suppress the decrease in work efficiency.

[0011] In one or more embodiments, the first battery pack may be mounted on the first battery mounting portion by sliding it from one side to the other in a direction parallel to the first axis. The second battery pack may be mounted on the second battery mounting portion by sliding it from one side to the other in a direction parallel to the second axis perpendicular to the first axis.

[0012] The above configuration helps to suppress the decrease in work efficiency.

[0013] In one or more embodiments, the impact wrench may include a main housing that accommodates a brushless motor. In a direction parallel to the second axis, one end of the main housing may be positioned to one side of one end of the first battery pack and one end of the second battery pack. The other end of the main housing may be positioned to the other side of the other end of the first battery pack and the other end of the second battery pack.

[0014] The above configuration helps to suppress the decrease in work efficiency.

[0015] In one or more embodiments, the first battery pack may be attached to the first battery mounting portion by sliding from one side to the other side in a direction parallel to the first axis with respect to the first battery mounting portion. The second battery pack may be attached to the second battery mounting portion by sliding from the other side to the one side in a direction parallel to the first axis with respect to the second battery mounting portion.

[0016] In the above configuration, a decrease in work efficiency is suppressed.

[0017] In one or more embodiments, the impact wrench may include a main body housing that houses a brushless motor. In a direction parallel to a second axis orthogonal to the first axis, one end of the main body housing may be disposed on one side of the one ends of the first battery pack and the second battery pack. The other end of the main body housing may be disposed on the other side of the other ends of the first battery pack and the second battery pack.

[0018] In the above configuration, a decrease in work efficiency is suppressed.

[0019] In one or more embodiments, the first battery pack may be attached to the first battery mounting portion by sliding from one side to the other side in a direction parallel to a second axis orthogonal to the first axis with respect to the first battery mounting portion. The second battery pack may be attached to the second battery mounting portion by sliding from one side to the other side in a direction parallel to the second axis with respect to the second battery mounting portion.

[0020] In the above configuration, a decrease in work efficiency is suppressed.

[0021] In one or more embodiments, the impact wrench may include a main housing that accommodates a brushless motor. In a direction parallel to the second axis, one end of the main housing may be positioned to one side of one end of the first battery pack and one end of the second battery pack. The other end of the main housing may be positioned to the other side of the other end of the first battery pack and the other end of the second battery pack.

[0022] The above configuration helps to suppress the decrease in work efficiency.

[0023] In one or more embodiments, the impact wrench may include a brushless motor, an impact mechanism rotated by the brushless motor, an anvil struck by the impact mechanism and rotating about a rotation axis extending parallel to a first axis, a first battery mounting section on which a first battery pack is mounted, and a second battery mounting section located next to the first battery mounting section on which a second battery pack is mounted. The first battery pack may be mounted to the first battery mounting section by sliding it from one side to the other in a direction parallel to a second axis perpendicular to the first axis. The second battery pack may be mounted to the second battery mounting section by sliding it from one side to the other in a direction parallel to a second axis.

[0024] The above configuration helps to suppress the decrease in work efficiency.

[0025] In one or more embodiments, the impact wrench may include a main housing that accommodates a brushless motor. In a direction parallel to the second axis, one end of the main housing may be positioned to one side of one end of the first battery pack and one end of the second battery pack. The other end of the main housing may be positioned to the other side of the other end of the first battery pack and the other end of the second battery pack.

[0026] The above configuration helps to suppress the decrease in work efficiency.

[0027] In one or more embodiments, the impact wrench may include a brushless motor, a striking mechanism rotated by the brushless motor, an anvil struck by the striking mechanism and rotating about a rotation axis extending parallel to a first axis, a first battery mounting section on which a first battery pack is mounted, a second battery mounting section on which a second battery pack is mounted, and a main housing that accommodates the brushless motor. In a direction parallel to the second axis perpendicular to the first axis, one end of the main housing may be positioned to one side of one end of the first battery pack and one end of the second battery pack. The other end of the main housing may be positioned to the other side of the other end of the first battery pack and the other end of the second battery pack.

[0028] The above configuration helps to suppress the decrease in work efficiency.

[0029] The embodiments of this disclosure will be described below with reference to the drawings, but this disclosure is not limited to these embodiments. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0030] In this embodiment, an XYZ Cartesian coordinate system is defined for the impact wrench, and the positional relationships of each part will be explained with reference to this XYZ Cartesian coordinate system. The direction parallel to the X-axis (first axis) of a predetermined plane is defined as the X-axis direction. The direction parallel to the Y-axis (second axis) of a predetermined plane perpendicular to the X-axis is defined as the Y-axis direction. The direction parallel to the Z-axis (third axis) perpendicular to a predetermined plane is defined as the Z-axis direction. The direction of rotation or tilting around the X-axis is defined as the θX direction. The direction of rotation or tilting around the Y-axis is defined as the θY direction. The direction of rotation or tilting around the Z-axis is defined as the θZ direction. In this embodiment, the X-axis direction is considered as the front-back direction, the Y-axis direction as the left-right direction, and the Z-axis direction as the up-down direction. The +X side is the front side, and the -X side is the rear side. The +Y side is the left side, and the -Y side is the right side. The +Z side is the upper side, and the -Z side is the lower side.

[0031] In this embodiment, 1 Nm, the unit of torque, can be converted to 0.7376 ft·lb, and 1 ft·lb can be converted to 1.36 Nm.

[0032] [First Embodiment] The first embodiment will be described.

[0033] <Impact wrench> Figure 1 is a perspective view showing the impact wrench 1A according to the first embodiment. Figure 2 is a cross-sectional view showing the impact wrench 1A according to the first embodiment. Figure 3 is a top view showing the impact wrench 1A according to the first embodiment.

[0034] The impact wrench 1A comprises a main body housing 2A, a first battery connection housing 3, a motor case 4, a gear case 5, a hammer case 6, a side handle 7, a bumper 8, 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, a striking mechanism 15A, an anvil 16A, a trigger switch 17A, a light assembly 18, and a suspension ring 9.

[0035] The main housing 2A houses the motor case 4. The main housing 2A also houses a portion of the gear case 5. The main housing 2A is fixed to the hammer case 6.

[0036] The main housing 2A is made of synthetic resin. Nylon resin is an example of the synthetic resin used to form the main housing 2A. The main housing 2A includes the left main housing 2L and the right main housing 2R. The right main housing 2R is positioned to the right of the left main housing 2L. The left main housing 2L and the right main housing 2R constitute a pair of split housings. The left main housing 2L and the right main housing 2R are fixed together by multiple screws.

[0037] The main housing 2A includes a main body section 21, a second battery connection housing 22A, a grip section 23, and a controller housing section 24.

[0038] The main body 21 houses the motor case 4. The main body 21 also houses a portion of the gear case 5. The suspension ring 9 is positioned on the upper part of the main body 21. The suspension ring 9 is fixed to the hammer case 6 by screws 41. Alternatively, the suspension ring 9 may be fixed to the gear case 5 by screws.

[0039] The second battery connection housing 22A protrudes downward from the main body 21. The second battery connection housing 22A is positioned in front of the first battery connection housing 3.

[0040] The grip portion 23 is held by the operator. The grip portion 23 is located on the rear side of the main body portion 21. The grip portion 23 includes a rear grip portion 23A that extends upward from the rear of the controller housing portion 24, and an upper grip portion 23B that extends forward from the upper end of the rear grip portion 23A. The lower end of the rear grip portion 23A is connected to the controller housing portion 24. The upper end of the rear grip portion 23A is connected to the rear end of the upper grip portion 23B. The front end of the upper grip portion 23B is connected to the top of the main body portion 21. The grip portion 23, the main body portion 21, and the controller housing portion 24 form a so-called D-shaped handle. The D-shaped handle is located on the rear side of the motor 10A. The trigger switch 17A is located on the top of the rear grip portion 23A.

[0041] The controller housing section 24 houses the controller 11A.

[0042] The first battery connection housing 3 supports the first battery mounting portion 31A. The first battery connection housing 3 is connected to the main housing 2A so as to be movable relative to the main housing 2A. The first battery connection housing 3 is made of synthetic resin. Nylon resin is an example of the synthetic resin that forms the first battery connection housing 3.

[0043] The first battery connection housing 3 is located below the controller housing 24. The first battery connection housing 3 is located behind the second battery connection housing 22A. The first battery connection housing 3 is connected to a D-shaped handle.

[0044] The motor case 4 houses the motor 10A. The motor case 4 is located below the gear case 5. The motor case 4 is fixed to the gear case 5.

[0045] The motor case 4 is made of synthetic resin. Polycarbonate resin is an example of the synthetic resin used to form the motor case 4.

[0046] The gear case 5 houses at least a portion of the reduction mechanism 13A. The gear case 5 is located on the rear side of the hammer case 6. The gear case 5 is fixed to the hammer case 6.

[0047] The gear case 5 is made of metal. Examples of metals used to form the gear case 5 include aluminum or magnesium.

[0048] The gear case 5 is substantially cylindrical. An opening is provided at the front of the gear case 5. An opening is provided at the rear of the gear case 5. An opening is provided at the bottom of the gear case 5. A bearing cover 40 is positioned in the rear opening of the gear case 5. The bearing cover 40 is fixed to the rear of the gear case 5 by screws 40S.

[0049] The hammer case 6 houses the striking mechanism 15A, which includes the hammer 71. The hammer case 6 is connected to the front of the main housing 2A. The hammer case 6 is connected to the front of the gear case 5.

[0050] The hammer case 6 is made of metal. Aluminum is an example of the metal used to form the hammer case 6.

[0051] The hammer case 6 is substantially cylindrical. The hammer case 6 has a first cylindrical portion 61, a second cylindrical portion 62, and a front wall portion 63. The first cylindrical portion 61 is arranged around the striking mechanism 15A, which includes the hammer 71. The second cylindrical portion 62 is located further forward than the first cylindrical portion 61. The outer diameter of the second cylindrical portion 62 is smaller than the outer diameter of the first cylindrical portion 61. The front end of the gear case 5 is inserted into an opening provided at the rear end of the first cylindrical portion 61. The front wall portion 63 connects the front end of the first cylindrical portion 61 and the rear end of the second cylindrical portion 62.

[0052] The main housing 2A, the gear case 5, and the hammer case 6 are fixed together by multiple screws 41.

[0053] An opening is provided at the top of the motor case 4. An opening is provided at the bottom of the gear case 5. The internal space of the motor case 4 and the internal space of the gear case 5 are connected via the opening at the top of the motor case 4 and the opening at the bottom of the gear case 5. The motor case 4 and the gear case 5 are fixed together by a number of screws (not shown).

[0054] An opening is provided at the front of the gear case 5. An opening is provided at the rear of the hammer case 6. The internal space of the gear case 5 and the internal space of the hammer case 6 are connected via the opening at the front of the gear case and the opening at the rear of the hammer case 6.

[0055] The side handle 7 is gripped by the operator. The side handle 7 has a handle portion 7A that is gripped by the operator and a base portion 7B that is fixed to the hammer case 6. The handle portion 7A is positioned on the left side of the hammer case 6. The handle portion 7A can be positioned at any position around the hammer case 6. For example, the handle portion 7A can be positioned on the right side of the hammer case 6, above the hammer case 6, or below the hammer case 6. The position (angle) of the handle portion 7A relative to the hammer case 6 is adjustable by 360 degrees.

[0056] The bumper 8 is positioned to cover at least a portion of the surface of the hammer case 6. In this embodiment, the bumper 8 is positioned to cover the surface of the first cylindrical portion 61. The bumper 8 protects the hammer case 6. The bumper 8 prevents contact between the hammer case 6 and surrounding objects of the impact wrench 1A. The bumper 8 is formed of an elastic material that is softer than the hammer case 6. Styrene-butadiene rubber is an example of the elastic material forming the bumper 8.

[0057] The first battery pack 33A is mounted in the first battery mounting section 31A. The first battery pack 33A is mounted in the first battery mounting section 31A by sliding it from the rear to the front. The first battery pack 33A can be attached to and detached from the first battery mounting section 31A. The controller housing section 24 is positioned above the first battery pack 33A mounted in the first battery mounting section 31A. The second battery connection housing 22A is positioned in front of the first battery pack 33A mounted in the first battery mounting section 31A.

[0058] The first battery mounting section 31A has terminal terminals. When the first battery pack 33A is mounted on the first battery mounting section 31A, the battery-side terminals, which are the connection terminals of the first battery pack 33A, are connected to the first main body-side terminals of the first battery mounting section 31A. The first main body-side terminals extend in the front-rear direction and are supported by the split-structure first battery connection housing 3.

[0059] The second battery mounting section 32A is provided at the front of the second battery connection housing 22A. The second battery mounting section 32A is located on the lower side of the hammer case 6. The second battery pack 34A is mounted in the second battery mounting section 32A. The second battery pack 34A is mounted in the second battery mounting section 32A by sliding it from the right side to the left side of the second battery mounting section 32A. The second battery pack 34A can be attached to and detached from the second battery mounting section 32A.

[0060] The second battery mounting section 32A has a second main unit side terminal. When the second battery pack 34A is mounted on the second battery mounting section 32A, the battery side terminal, which is the connection terminal of the second battery pack 34A, is connected to the second main unit side terminal of the second battery mounting section 32A. The second main unit side terminal extends in the left-right direction and is supported by the split-structure second battery connection housing 22A.

[0061] The first battery pack 33A and the second battery pack 34A each function 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 installed in the first battery mounting section 31A, the first battery pack 33A can supply power to the impact wrench 1A. By being installed in 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 the first battery pack 33A and the second battery pack 34A, respectively. The controller 11A operates based on the power supplied from the first battery pack 33A and the second battery pack 34A, respectively.

[0062] The suspension ring 9 is positioned between the first battery pack 33A and the second battery pack 34A in the front-to-back direction. This improves the balance when the impact wrench 1A, which is driven by the two battery packs (33A and 34A), is suspended from the object using the suspension ring 9. This improvement in balance is an advantage that applies not only to impact wrenches but to power tools in general.

[0063] Furthermore, the motor 10A is positioned between the first battery pack 33A and the second battery pack 34A in the front-to-back direction. In this embodiment, the first battery mounting section 31A, to which the first battery pack 33A is mounted, is positioned behind the motor 10A, and the second battery mounting section 32A, to which the second battery pack 34A is mounted, is positioned in front of the motor 10A. Since the heavy motor 10A and the two battery packs (33A, 34A) are positioned side by side in the front-to-back direction, the balance is improved. This improvement in balance is an advantage that applies not only to impact wrenches but to power tools in general.

[0064] The first battery connection housing 3 holds a spring 45 and a cushion rubber 46. The spring 45 is positioned on the front side of the first battery mounting section 31A. The cushion rubber 46 is positioned on the front side of the first battery pack 33A mounted on the first battery mounting section 31A. The spring 45 biases the first battery mounting section 31A toward the rear. The cushion rubber 46 is positioned on the front side of the first battery pack 33A mounted on the first battery mounting section 31A. The cushion rubber 46 is positioned further forward than the first battery pack 33A mounted on the first battery mounting section 31A. The cushion rubber 46 can contact the front of the first battery pack 33A. For example, if the impact wrench 1A is dropped, the elastic force of the spring 45 mitigates the impact acting on the first battery mounting section 31A, and the cushion rubber 46 mitigates the impact acting on the first battery pack 33A.

[0065] Although not shown in detail, the second battery connection housing 22A, which is provided with the second battery mounting section 32A, has the same configuration as the first battery connection housing 3. That is, the second battery connection housing 22A holds a spring and a cushion rubber. The spring is located on the rear side of the second battery mounting section 32A. The cushion rubber is located on the rear side of the second battery pack 34A mounted on the second battery mounting section 32A. The spring biases the second battery mounting section 32A forward. The cushion rubber is located on the front side of the second battery pack 34A mounted on the second battery mounting section 32A. The cushion rubber is located further rear than the second battery pack 34A mounted on the second battery mounting section 32A. The cushion rubber can contact the rear of the second battery pack 34A. For example, if the impact wrench 1A is dropped, the spring's elastic force mitigates the impact on the second battery mounting section 32A, and the cushioning rubber mitigates the impact on the second battery pack 34A.

[0066] Motor 10A functions as the power source for impact wrench 1A. Motor 10A is an inner rotor type DC brushless motor. Motor 10A is housed in motor case 4. Motor case 4 is housed in the main body portion 21 of main body housing 2A. The main body portion 21 of main body housing 2A houses motor 10A via motor case 4.

[0067] The motor 10A includes a stator 47, a rotor 48, and a rotor shaft 49. The stator 47 is fixed to the motor case 4 in a non-rotatable manner. At least a portion of the rotor 48 is positioned inside the stator 47. The rotor shaft 49 is fixed to the rotor 48. The rotor 48 is rotatable relative to the stator 47 about the motor rotation axis MX, which extends in the vertical direction (Z-axis direction).

[0068] The stator 47 has a stator core having multiple teeth and multiple coils wound around each of the multiple teeth of the stator core via an insulator. The multiple coils are connected via a busbar unit.

[0069] The rotor 48 rotates around the motor rotation axis MX. The rotor 48 has a rotor core and rotor magnets fixed to the rotor core.

[0070] The sensor board 50 is fixed to the insulator of the stator 47. The sensor board 50 detects the rotational position of the rotor 48. The sensor board 50 has a rotation detection element supported on an annular circuit board. The rotation detection element detects the rotational position of the rotor 48 by detecting the position of the rotor magnet of the rotor 48.

[0071] The rotor shaft 49 is fixed to the rotor core of the rotor 48. The rotor 48 and the rotor shaft 49 rotate together around the motor rotation axis MX.

[0072] The rotor shaft 49 is rotatably supported by rotor bearings 51 and 52, respectively. Rotor bearing 51 rotatably supports the upper part of the rotor shaft 49 that protrudes above the upper end surface of the rotor 48. Rotor bearing 52 rotatably supports the lower part of the rotor shaft 49 that protrudes below the lower end surface of the rotor 48. Rotor bearing 51 is held in the gear case 5. Rotor bearing 52 is held in the motor case 4.

[0073] A first bevel gear 53 is fixed to the upper end of the rotor shaft 49. The first bevel gear 53 is connected to at least a portion of the reduction mechanism 13A. The rotor shaft 49 is connected to the reduction mechanism 13A via the first bevel gear 53.

[0074] Controller 11A outputs a control signal to control motor 10A. Controller 11A includes a circuit board on which multiple electronic components are mounted. Examples of electronic components mounted on the circuit board include a processor such as a CPU (Central Processing Unit), non-volatile memory such as ROM (Read Only Memory) or storage, volatile memory such as RAM (Random Access Memory), field-effect transistors (FETs), and resistors.

[0075] The controller 11A is housed in the controller housing 24.

[0076] Fan 12 generates airflow to cool the motor 10A and controller 11A. Fan 12 is positioned above the stator 47. Fan 12 is fixed to the top of the rotor shaft 49. Fan 12 is positioned between the rotor bearing 51 and the stator 47. Fan 12 and the rotor shaft 49 rotate together.

[0077] An air intake port 26 is provided in the controller housing 24. An exhaust port 27 is provided at the top of the main body 21. As the fan 12 rotates, air from the external space of the main body housing 2A flows into the internal space of the controller housing 24 through the air intake port 26. The air that flows into the internal space of the controller housing 24 cools the controller 11A by circulating through the internal space of the controller housing 24. As the fan 12 rotates, the air that has circulated through the internal space of the controller housing 24 flows into the internal space of the motor case 4 through a vent provided at the rear of the motor case 4. The air that has circulated through the internal space of the motor case 4 cools the motor 10A by circulating through the internal space of the motor case 4. At least a portion of the air that has circulated through the internal space of the motor case 4 flows out into the external space of the motor case 4 through the exhaust port 27 as the fan 12 rotates.

[0078] 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 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.

[0079] The reduction gear 13A includes a second bevel gear 54 that meshes with the first bevel gear 53, and a planetary gear mechanism 55 that is driven based on the rotational force of the motor 10A transmitted via the second bevel gear 54.

[0080] The planetary gear mechanism 55 includes a sun gear 55S, planetary gears 55P, and an internal gear 55I. Multiple planetary gears 55P are provided. The multiple planetary gears 55P are arranged around the sun gear 55S. The internal gear 55I is arranged around the multiple planetary gears 55P. The planetary gear mechanism 55 is housed in a gear case 5.

[0081] The second bevel gear 54 is positioned around the sun gear 55S. The second bevel gear 54 is fixed to the sun gear 55S. The second bevel gear 54 and the sun gear 55S rotate together. The second bevel gear 54 and the sun gear 55S are rotatable around an output rotation axis AX that extends in the front-rear direction (X-axis direction). The output rotation axis AX and the motor rotation axis MX are orthogonal. The rear end of the sun gear 55S is supported by a gear bearing 56. The middle part of the sun gear 55S is supported by a gear bearing 57. The gear bearing 56 is held in a bearing cover 40. The gear bearing 57 is held in a gear case 5. The rotor shaft 49 rotates, causing the first bevel gear 53 to rotate, which in turn causes the second bevel gear 54 to rotate. The rotation of the second bevel gear 54 causes the sun gear 55S to rotate.

[0082] Each of the multiple planetary gears 55P meshes with the sun gear 55S. The planetary gears 55P are rotatably supported on the spindle 14 via pins 55A. The spindle 14 is rotated by the planetary gears 55P. The internal gear 55I has internal teeth that mesh with the planetary gears 55P. The internal gear 55I is fixed to the gear case 5. Multiple protrusions are provided on the outer circumferential surface of the internal gear 55I. The protrusions of the internal gear 55I fit into recesses provided on the inner circumferential surface of the gear case 5. The internal gear 55I is always immobile relative to the gear case 5.

[0083] When the rotor shaft 49 and the first bevel gear 53 are rotated by the drive of the motor 10A, the second bevel gear 54 and the sun gear 55S also rotate. When the sun gear 55S rotates, 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 revolving of the planetary gear 55P, the spindle 14, which is connected to the planetary gear 55P via pin 55A, rotates at a lower rotational speed than the rotational speed of the rotor shaft 49.

[0084] 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 striking mechanism 15A. The spindle 14 is rotatable about the output rotation axis AX. The rear part of the spindle 14 is housed in the gear case 5. The front part of the spindle 14 is housed in the hammer case 6. At least a portion of the spindle 14 is positioned in front of the reduction mechanism 13A. The spindle 14 is positioned behind the anvil 16A.

[0085] 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.

[0086] The planetary gear 55P is rotatably supported on the flange portion 14A and the projection portion 14C via a pin 55A. The spindle 14 is rotatably supported on a spindle bearing 58. The spindle bearing 58 rotatably supports the projection portion 14C. The spindle bearing 58 is held in the gear case 5.

[0087] The striking mechanism 15A strikes the anvil 16A in a rotational direction around the output rotation axis AX. The striking mechanism 15A is positioned in front of the motor 10A. The striking mechanism 15A is rotated by the motor 10A. The striking mechanism 15A is rotatable around the output rotation axis AX. The rotational force of the motor 10A is transmitted to the striking mechanism 15A via the reduction mechanism 13A and the spindle 14. The striking mechanism 15A strikes the anvil 16A in a rotational direction based on the rotational force of the spindle 14, which is rotated by the motor 10A.

[0088] The striking mechanism 15A is housed in the first cylindrical portion 61 of the hammer case 6. The striking mechanism 15A includes a hammer 71, a ball 72, a first coil spring 73, a second coil spring 74, a third coil spring 75, a first washer 76, and a second washer 77.

[0089] The hammer 71 is positioned in front of the reduction mechanism 13A. The hammer 71 is positioned 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 positioned between the spindle shaft portion 14B and the hammer 71. The hammer 71 has a cylindrical hammer body 71A and a hammer projection 71B provided on 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 forward from the rear surface of the hammer body 71A.

[0090] 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 mechanism 13A and the spindle 14. The hammer 71 is rotatable together with the spindle 14 based on the rotational force of the spindle 14, which is rotated by the motor 10A. Both the hammer 71 and the spindle 14 rotate around the output rotation axis AX.

[0091] The first washer 76 is positioned inside the recess 71C. The first washer 76 is supported by the hammer 71 via a plurality of balls 78. The balls 78 are positioned on the front side of the first washer 76.

[0092] The second washer 77 is positioned inside the recess 71C, behind the first washer 76. The outer diameter of the second washer 77 is smaller than the outer diameter of the first washer 76. The second washer 77 and the hammer 71 are relatively movable in the front-rear direction.

[0093] The first coil spring 73 is positioned around the spindle shaft portion 14B. The rear end of the first coil spring 73 is supported by the flange portion 14A. The front end of the first coil spring 73 is positioned inside the recess 71C and supported by the first washer 76. The first coil spring 73 constantly generates an elastic force that moves the hammer 71 forward.

[0094] The second coil spring 74 is positioned around the spindle shaft portion 14B. The second coil spring 74 is positioned radially inward of the first coil spring 73. The rear end of the second coil spring 74 is supported by the flange portion 14A. The front end of the second coil spring 74 is positioned inside the recess 71C and supported by the second washer 77. The second coil spring 74 generates an elastic force that moves the hammer 71 forward when the hammer 71 moves backward.

[0095] The third coil spring 75 is positioned around the spindle shaft portion 14B. The third coil spring 75 is positioned radially inward of the first coil spring 73. The third coil spring 75 is positioned inside the recess 71C. The rear end of the third coil spring 75 is supported by the second washer 77. The front end of the third coil spring 75 is supported by the first washer 76. The third coil spring 75 generates an elastic force that moves the second coil spring 74 backward. Due to the elastic force of the third coil spring 75, the rear end of the second coil spring 74 is pressed against the flange portion 14A. This prevents the second coil spring 74 from moving freely relative to the flange portion 14A.

[0096] The ball 72 is made of a metal such as steel. The ball 72 is positioned between the spindle shaft portion 14B and the hammer 71. The spindle 14 has a spindle groove in which at least a portion of the ball 72 is positioned. The spindle groove is provided on a portion of the outer surface of the spindle shaft portion 14B. The hammer 71 has a hammer groove in which at least a portion of the ball 72 is positioned. The hammer groove is provided on a portion of the inner surface of the hammer 71. The ball 72 is positioned between the spindle groove and the hammer groove. The ball 72 can roll inside the spindle groove and inside the hammer groove, respectively. The hammer 71 is movable along with the ball 72. The spindle 14 and the hammer 71 can move relative to each other in a direction parallel to the output rotation axis AX and in a rotational direction about the output rotation axis AX, respectively, within the range of motion defined by the spindle groove and the hammer groove.

[0097] The anvil 16A rotates around an output rotation axis AX that extends in the front-rear direction. The anvil 16A is the output section of the impact wrench 1A, which rotates based on the rotational force of the motor 10A. At least a portion of the anvil 16A is positioned 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 positioned in an anvil recess provided at the rear end of the anvil 16A.

[0098] The anvil 16A has an anvil shaft portion 161 and an anvil projection portion 162. The anvil shaft portion 161 is positioned in front of the striking mechanism 15A. The anvil projection portion 162 protrudes radially outward from the rear end of the anvil shaft portion 161. The anvil projection portion 162 is struck by the striking mechanism 15A in a rotational direction about the output rotation axis AX.

[0099] The front end of the anvil shaft portion 161 is positioned on the front side of the hammer case 6 through the opening at the front of the second cylindrical portion 62. A socket is attached to the front end of the anvil shaft portion 161 as a tip tool.

[0100] Anvil 16A is rotatably supported by an anvil bearing 79. The anvil bearing 79 is positioned around the anvil shaft portion 161. Anvil 16A is rotatable about the output rotation axis AX. The anvil bearing 79 is held in the hammer case 6. The anvil bearing 79 is positioned inside the second cylindrical portion 62 of the hammer case 6. The anvil bearing 79 is held in the second cylindrical portion 62 of the hammer case 6.

[0101] 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. Alternatively, a sliding bearing may be formed by impregnating a cylindrical porous metal body manufactured by powder metallurgy with lubricating oil.

[0102] In a cross-section perpendicular to the output rotation axis AX, the outer circumferential shape of the anvil shaft portion 161 is circular. In a cross-section perpendicular to the output rotation axis AX, the inner circumferential shape of the anvil bearing 79 is circular.

[0103] The front end of the anvil shaft portion 161 is positioned forward of the second cylindrical portion 62 through the opening at the front end of the second cylindrical portion 62. At least a portion of the anvil shaft portion 161 is positioned inside the opening at the front end of the second cylindrical portion 62.

[0104] The trigger switch 17A is operated by the operator to drive the motor 10A. Driving the motor 10A means that the coils of the stator 47 are energized and the rotor 48 rotates. The trigger switch 17A is located on the upper part of the rear grip section 23A. The trigger switch 17A protrudes forward from the upper front part of the rear grip section 23A. The trigger switch 17A is operated by the operator to move it backward. When the trigger switch 17A is operated to move it backward, the motor 10A is driven. When the operation of the trigger switch 17A is released, the motor 10A stops being driven.

[0105] The light assembly 18 emits illumination light. The light assembly 18 illuminates the anvil 16A and the area around the anvil 16A with illumination light. The light assembly 18 illuminates the area in front of the anvil 16A with illumination light. In addition, the light assembly 18 illuminates the socket attached to the anvil 16A and the area around the socket with illumination light. The light assembly 18 is positioned around the second cylindrical portion 62 of the hammer case 6.

[0106] <How an impact wrench works> Next, the operation of the impact wrench 1A will be described. For example, when performing fastening work on an object, the socket used for fastening is attached to the front end of the anvil 16A. After the socket is attached to the anvil 16A, the operator grips the side handle 7 with their left hand and the grip portion 23 with their right hand, and operates the trigger switch 17A with their right index and middle fingers so that the trigger switch 17A moves to the rear. When the trigger switch 17A is operated to move to the rear, power is supplied to the motor 10A from the first battery pack 33A and the second battery pack 34A, the motor 10A is driven, and the light assembly 18 lights up. The motor 10A drives the rotor 48 and rotor shaft 49 to rotate. When the rotor shaft 49 rotates, the rotational force of the rotor shaft 49 is transmitted to the planetary gear 55P via the first bevel gear 53, the second bevel gear 54, and the sun gear 55S. The planetary gear 55P rotates on its own axis while revolving around the sun gear 55S, meshing with the internal teeth of the internal gear 55I. The planetary gear 55P is rotatably supported on the spindle 14 via pin 55A. Due to the revolution of the planetary gear 55P, the spindle 14 rotates at a lower rotational speed than the rotational speed of the rotor shaft 49.

[0107] When the spindle 14 rotates while the hammer projection 71B and the anvil projection 162 are in contact, the anvil 16A rotates together with the hammer 71 and the spindle 14. The rotation of the anvil 16A allows the fastening process to proceed.

[0108] If a load exceeding a predetermined value is applied to the anvil 16A as the fastening process progresses, the rotation of the anvil 16A and the hammer 71 will stop. 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, contact between the hammer projection 71B and the anvil projection 162 is released. The hammer 71, having moved backward, 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 around the output rotation axis AX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0109] <Battery mounting section and battery pack> As described above, the impact wrench 1A includes a first battery mounting section 31A to which the first battery pack 33A is mounted, and a second battery mounting section 32A to which the second battery pack 34A is mounted. In the front-rear direction (X-axis direction), the second battery mounting section 32A is positioned differently from the first battery mounting section 31A. In this embodiment, the second battery mounting section 32A is positioned further forward than the first battery mounting section 31A.

[0110] In this embodiment, the first battery mounting portion 31A is located in the first battery connection housing 3. The second battery mounting portion 32A is located in front of the second battery connection housing 22A.

[0111] The first battery pack 33A is installed in the first battery mounting section 31A by sliding it from the rear (-X side) to the front (+X side). The second battery pack 34A is installed in the second battery mounting section 32A by sliding it from the right (-Y side) to the left (+Y side).

[0112] As shown in Figure 3, the right end of the main housing 2A is positioned to the right of the right end of the first battery pack 33A and the right end of the second battery pack 34A. The left end of the main housing 2A is positioned to the left of the left end of the first battery pack 33A and the left end of the second battery pack 34A. In other words, the first battery pack 33A does not protrude to the right of the right end of the main housing 2A. The first battery pack 33A does not protrude to the left of the left end of the main housing 2A. The second battery pack 34A does not protrude to the right of the right end of the main housing 2A. The second battery pack 34A does not protrude to the left of the left end of the main housing 2A.

[0113] 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 each be 18V or 36V. In this embodiment, the rated voltage of the first battery pack 33A and the rated voltage of the second battery pack 34A are both 18V, with a maximum of 20V (20Vmax). The voltage supplied to the motor is 36V (40Vmax) by connecting the battery packs in series. Note that if the rated voltage of the battery packs is 36V, they are connected in parallel, so the maximum is 40V (40Vmax).

[0114] The external dimensions and appearance of the first battery pack 33A are the same as those of the second battery pack 34A.

[0115] In other words, the first battery pack 33A and the second battery pack 34A are of the same type. However, the motor can be operated even if the capacity (amperes per hour, Ah) is different. For example, even if the first battery pack 33A is an 18V 5Ah battery and the second battery pack 34A is an 18V 2Ah battery, the impact wrench can still be operated.

[0116] The structure and size of the second main unit-side terminal of the first battery mounting section 31A are the same as the structure and size of the second main unit-side terminal of the second battery mounting section 32A.

[0117] In this embodiment, the maximum tightening torque of the anvil 16A is less than 3000 Nm. The range is 2000 Nm or more and 3000 Nm or less. However, it is also acceptable to set it to 3000 Nm or more and 4000 Nm or less.

[0118] <Effects> As described above, in this embodiment, the impact wrench 1A includes a motor 10A which is a brushless motor, an impact mechanism 15A which is rotated by the motor 10A, an anvil 16A which is struck by the impact mechanism 15A and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31A to which a first battery pack 33A is attached, and a second battery mounting section 32A which is positioned differently from the first battery mounting section 31A in a direction parallel to the X axis and to which a second battery pack 34A is attached.

[0119] The above configuration helps to suppress the decrease in work efficiency.

[0120] In this embodiment, the first battery pack 33A is mounted on the first battery mounting section 31A by sliding it from the -X side to the +X side in a direction parallel to the X-axis. The second battery pack 34A is mounted on the second battery mounting section 32A by sliding it from the -Y side to the +Y side in a direction parallel to the Y-axis which is perpendicular to the X-axis.

[0121] The above configuration helps to suppress the decrease in work efficiency.

[0122] In this embodiment, the impact wrench 1A includes a main housing 2A that houses the motor 10A. In a direction parallel to the Y-axis, the -Y end of the main housing 2A is positioned to the -Y side of the -Y end of the first battery pack 33A and the -Y end of the second battery pack 34A. The +Y end of the main housing 2A is positioned to the +Y side of the +Y end of the first battery pack 33A and the +Y end of the second battery pack 34A.

[0123] The above configuration helps to suppress the decrease in work efficiency.

[0124] In this embodiment, the impact wrench 1A includes a brushless motor 10A, a striking mechanism 15A rotated by the motor 10A, an anvil 16A struck by the striking mechanism 15A and rotating around an output rotation axis AX extending in a direction parallel to the X-axis, a first battery mounting section 31A to which a first battery pack 33A is mounted, a second battery mounting section 32A to which a second battery pack 34A is mounted, and a main body housing 2A that houses the motor 10A. In a direction perpendicular to the X-axis and parallel to the Y-axis, the -Y end of the main body housing 2A is positioned to the -Y side of the -Y end of the first battery pack 33A and the -Y end of the second battery pack 34A. The +Y end of the main body housing 2A is positioned to the +Y side of the +Y end of the first battery pack 33A and the +Y end of the second battery pack 34A.

[0125] The above configuration helps to suppress the decrease in work efficiency.

[0126] In this embodiment, the suspension ring 9 is positioned between the first battery pack 33A and the second battery pack 34A in the front-to-back direction. Therefore, when the impact wrench 1A, which is driven by the two battery packs (33A, 34A), is suspended from the object to be suspended by the suspension ring 9, the balance is improved. Such an improvement in balance is an advantage that applies not only to impact wrenches but to power tools in general.

[0127] In this embodiment, the motor 10A is positioned between the first battery pack 33A and the second battery pack 34A in the front-to-back direction. In this embodiment, the first battery mounting section 31A, to which the first battery pack 33A is mounted, is positioned behind the motor 10A, and the second battery mounting section 32A, to which the second battery pack 34A is mounted, is positioned in front of the motor 10A. Since the heavy motor 10A and the two battery packs (33A, 34A) are positioned side by side in the front-to-back direction, the balance is improved. This improvement in balance is an advantage that applies not only to impact wrenches but to power tools in general.

[0128] The components according to this embodiment are not limited to impact wrenches but can also be applied to other power tools. For example, the components according to this embodiment can be used in hammer drills, reciprocating saws, circular saws, and band saws. Furthermore, the components according to this embodiment can also be applied to gardening tools (OPE products). For example, the components according to this embodiment can be used in hedge trimmers, chainsaws, and blowers. The same applies to the components according to the embodiments described below.

[0129] [Second Embodiment] A second embodiment will now be described. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0130] <Impact wrench> Figure 4 is a perspective view showing the impact wrench 1B according to the second embodiment. The impact wrench 1B according to this embodiment is a modified version of the impact wrench 1A according to the first embodiment described above.

[0131] The impact wrench 1B comprises a main body housing 2B, a gear case 5, a hammer case 6, a side handle 7, a bumper 8, a first battery mounting section 31B, a second battery mounting section 32B, an anvil 16B, and a trigger switch 17B.

[0132] The main housing 2B includes a main body portion 21 that houses the motor 10A, a battery connection housing 22B that protrudes downward from the main body portion 21, a grip portion 23, and a controller housing portion 24.

[0133] Anvil 16B rotates around an output rotation axis AX that extends in the X-axis direction.

[0134] The first battery pack 33B is mounted in the first battery mounting section 31B. The first battery pack 33B can be attached to and detached from the first battery mounting section 31B. The first battery mounting section 31B is located at the front of the battery connection housing 22B.

[0135] The second battery pack 34B is mounted in the second battery mounting section 32B. The second battery pack 34B can be attached to and detached from the second battery mounting section 32B. The second battery mounting section 32B is located at the front of the battery connection housing 22B.

[0136] In this embodiment, the second battery mounting section 32B is located next to the first battery mounting section 31B.

[0137] In the X-axis direction, the first battery mounting section 31B and the second battery mounting section 32B are positioned substantially in the same location. In the Y-axis direction, the first battery mounting section 31B and the second battery mounting section 32B are positioned substantially in the same location. In the Z-axis direction, the first battery mounting section 31B and the second battery mounting section 32B are positioned in different locations. In this embodiment, the first battery mounting section 31B is positioned above (towards the +Z side) the second battery mounting section 32B. The second battery mounting section 32B is positioned next to the first battery mounting section 31B in the Z-axis direction.

[0138] The first battery pack 33B is installed in the first battery mounting section 31B by sliding it from the right side (-Y side) to the left side (+Y side). The second battery pack 34B is installed in the second battery mounting section 32B by sliding it from the right side (-Y side) to the left side (+Y side).

[0139] The right end of the main housing 2B is positioned to the right of the right end of the first battery pack 33B and the right end of the second battery pack 34B. The left end of the main housing 2B is positioned to the left of the left end of the first battery pack 33B and the left end of the second battery pack 34B. In other words, the first battery pack 33B does not protrude to the right of the right end of the main housing 2B. The first battery pack 33B does not protrude to the left of the left end of the main housing 2B. The second battery pack 34B does not protrude to the right of the right end of the main housing 2B. The second battery pack 34B does not protrude to the left of the left end of the main housing 2B.

[0140] The rated voltage of the first battery pack 33B and the rated voltage of the second battery pack 34B are equal. The rated voltage of the first battery pack 33B and the rated voltage of the second battery pack 34B may each be 18V or 36V. In this embodiment, the rated voltage of the first battery pack 33B and the rated voltage of the second battery pack 34B are each 36V, and a maximum of 40V.

[0141] The external shape and dimensions of the first battery pack 33B and the second battery pack 34B are the same.

[0142] In other words, the first battery pack 33B and the second battery pack 34B are of the same type.

[0143] The structure and size of the terminals on the main unit side of the first battery mounting section 31B and the structure and size of the terminals on the main unit side of the second battery mounting section 32B are the same.

[0144] In this embodiment, the maximum tightening torque of the anvil 16B is less than 3000 Nm.

[0145] <Effects> As described above, in this embodiment, the impact wrench 1B includes a motor 10A which is a brushless motor, an impact mechanism 15A which is rotated by the motor 10A, an anvil 16B which is struck by the impact mechanism 15A and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31B on which the first battery pack 33B is mounted, and a second battery mounting section 32B which is located next to the first battery mounting section 31B and on which the second battery pack 34B is mounted. The first battery pack 33B is mounted on the first battery mounting section 31B by sliding it from the -Y side to the -Y side in a direction parallel to the Y axis which is perpendicular to the X axis. The second battery pack 34B is mounted on the second battery mounting section 32B by sliding it from the -Y side to the -Y side in a direction parallel to the Y axis.

[0146] The above configuration helps to suppress the decrease in work efficiency.

[0147] In this embodiment, the impact wrench 1B includes a main housing 2B that houses the motor 10A. In a direction parallel to the Y-axis, the -Y end of the main housing 2B is positioned to the -Y side of the -Y end of the first battery pack 33B and the -Y end of the second battery pack 34B. The +Y end of the main housing 2B is positioned to the +Y side of the +Y end of the first battery pack 33B and the +Y end of the second battery pack 34B.

[0148] The above configuration helps to suppress the decrease in work efficiency.

[0149] In this embodiment, the impact wrench 1B includes a motor 10A which is a brushless motor, a striking mechanism 15A rotated by the motor 10A, an anvil 16B which is struck by the striking mechanism 15A and rotates around an output rotation axis AX extending in a direction parallel to the X-axis, a first battery mounting section 31B on which a first battery pack 33B is mounted, a second battery mounting section 32B on which a second battery pack 34B is mounted, and a main body housing 2B which houses the motor 10A. In a direction parallel to the Y-axis which is perpendicular to the X-axis, the -Y end of the main body housing 2B is positioned to the -Y side of the -Y end of the first battery pack 33B and the -Y end of the second battery pack 34B. The +Y end of the main body housing 2B is positioned to the +Y side of the +Y end of the first battery pack 33B and the +Y end of the second battery pack 34B.

[0150] The above configuration helps to suppress the decrease in work efficiency.

[0151] [Third Embodiment] A third embodiment will now be described. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0152] <Impact wrench> Figure 5 is a side view showing the impact wrench 1C according to the third embodiment. The impact wrench 1C according to this embodiment is a modified example of the impact wrench 1A according to the first embodiment described above.

[0153] The impact wrench 1C comprises a main body housing 2C, a battery connection housing 3C, a gear case 5, a hammer case 6, a side handle 7, a bumper 8, a first battery mounting section 31C, a second battery mounting section 32C, an anvil 16C, and a trigger switch 17C.

[0154] The main housing 2C includes a main body portion 21 that houses the motor 10A, a protruding portion 22C that protrudes downward from the main body portion 21, a grip portion 23, and a controller housing portion 24.

[0155] Anvil 16C rotates around an output rotation axis AX that extends in the X-axis direction.

[0156] The first battery pack 33C is mounted in the first battery mounting section 31C. The first battery pack 33C can be attached to and detached from the first battery mounting section 31C. The first battery mounting section 31C is provided in the battery connection housing 3C.

[0157] The second battery pack 34C is installed in the second battery mounting section 32C. The second battery pack 34C can be attached to and detached from the second battery mounting section 32C. The second battery mounting section 32C is provided in the battery connection housing 3C.

[0158] In this embodiment, the second battery mounting section 32C is located next to the first battery mounting section 31C.

[0159] In the X-axis direction, the first battery mounting section 31C and the second battery mounting section 32C are positioned at different locations. In this embodiment, the first battery mounting section 31C is positioned further back (towards the X-axis) than the second battery mounting section 32C. The second battery mounting section 32C is positioned next to the first battery mounting section 31C in the X-axis direction. In the Y-axis direction, the first battery mounting section 31C and the second battery mounting section 32C are positioned at substantially the same location. In the Z-axis direction, the first battery mounting section 31C and the second battery mounting section 32C are positioned at substantially the same location.

[0160] The first battery pack 33C is installed in the first battery mounting section 31C by sliding it from the right side (-Y side) to the left side (+Y side). The second battery pack 34C is installed in the second battery mounting section 32C by sliding it from the right side (-Y side) to the left side (+Y side).

[0161] The right end of the main housing 2C is positioned to the right of the right end of the first battery pack 33C and the right end of the second battery pack 34C. The left end of the main housing 2C is positioned to the left of the left end of the first battery pack 33C and the left end of the second battery pack 34C. In other words, the first battery pack 33C does not protrude to the right of the right end of the main housing 2C. The first battery pack 33C does not protrude to the left of the left end of the main housing 2C. The second battery pack 34C does not protrude to the right of the right end of the main housing 2C. The second battery pack 34C does not protrude to the left of the left end of the main housing 2C.

[0162] The rated voltage of the first battery pack 33C and the rated voltage of the second battery pack 34C are equal. The rated voltage of the first battery pack 33C and the rated voltage of the second battery pack 34C may each be 18V or 36V. In this embodiment, the rated voltage of the first battery pack 33C and the rated voltage of the second battery pack 34C are both 36V, with a maximum of 40V (40Vmax). The voltage supplied to the motor may be 72V (80Vmax) or remain at 36V (40Vmax). In the case of 18V, the maximum is 20V (20Vmax).

[0163] The external dimensions and appearance of the first battery pack 33C and the second battery pack 34C are the same.

[0164] In other words, the first battery pack 33C and the second battery pack 34C are of the same type.

[0165] The structure and size of the terminals of the first battery mounting section 31C and the second battery mounting section 32C are the same.

[0166] In this embodiment, the maximum tightening torque of the anvil 16C is less than 3000 Nm. The range is 2000 Nm or more and 3000 Nm or less. However, it is also acceptable to use a range of 3000 Nm or more and 4000 Nm or less.

[0167] The specifications of the impact wrenches 1A, 1B, and 1C according to this embodiment are as follows.

[0168] • Total rated voltage of battery packs: 36V (40Vmax) or higher • Stator core outer diameter: 80mm or more (maximum diameter is 140mm) • Maximum tightening torque for the anvil: Approximately 3000 Nm (2000 Nm to 3000 Nm, or 3000 Nm to 4000 Nm is also acceptable) • Number of strikes in the striking mechanism: 900 rpm (700 rpm to 1500 rpm is also acceptable) • Anvil no-load rotational speed: 685 rpm (500 rpm to 1000 rpm is also acceptable) • Reduction ratio of the reduction mechanism: 1 / 33.7 (Any ratio between 1 / 25 and 1 / 40 is acceptable) • Hammer weight: 1.3kg (1kg to 1.5kg is also acceptable) • Length of one side of the socket mounting section of the anvil: 1 inch (0.5 inches or more, but 1.5 inches or less is also acceptable) • External dimensions of the impact wrench without the battery pack: Z-axis: 197mm, Y-axis: 130mm, X-axis: 456mm (It is acceptable if the Z-axis is between 180mm and 210mm, the Y-axis is between 110mm and 140mm, and the X-axis is between 400mm and 500mm) • Weight of impact wrench without battery pack: 10kg (7kg to 13kg is also acceptable)

[0169] <Effects> As described above, in the embodiment, the impact wrench 1C includes a motor 10A which is a brushless motor, an impact mechanism 15A which is rotated by the motor 10A, an anvil 16C which is struck by the impact mechanism 15A and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31C on which a first battery pack 33C is mounted, and a second battery mounting section 32C which is positioned differently from the first battery mounting section 31C in a direction parallel to the X axis and on which a second battery pack 34C is mounted.

[0170] The above configuration helps to suppress the decrease in work efficiency.

[0171] In this embodiment, the impact wrench 1C includes a main housing 2C that houses a motor 10A. In a direction parallel to the Y-axis, the -Y end of the main housing 2C is positioned to the -Y side of the -Y end of the first battery pack 33C and the -Y end of the second battery pack 34C. The +Y end of the main housing 2C is positioned to the +Y side of the +Y end of the first battery pack 33C and the +Y end of the second battery pack 34C.

[0172] The above configuration helps to suppress the decrease in work efficiency.

[0173] In this embodiment, the first battery pack 33C is mounted on the first battery mounting section 31C by sliding it from the -Y side to the +Y side in a direction parallel to the Y axis and perpendicular to the X axis. The second battery pack 34C is mounted on the second battery mounting section 32C by sliding it from the -Y side to the +Y side in a direction parallel to the Y axis.

[0174] The above configuration helps to suppress the decrease in work efficiency.

[0175] In this embodiment, the impact wrench 1C includes a motor 10A which is a brushless motor, an impact mechanism 15A which is rotated by the motor 10A, an anvil 16C which is struck by the impact mechanism 15A and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31C on which a first battery pack 33C is mounted, and a second battery mounting section 32C which is located next to the first battery mounting section 31C and on which a second battery pack 34C is mounted. The first battery pack 33C is mounted on the first battery mounting section 31C by sliding it from the -Y side to the +Y side in a direction parallel to the Y axis which is perpendicular to the X axis. The second battery pack 34C is mounted on the second battery mounting section 32C by sliding it from the -Y side to the +Y side in a direction parallel to the Y axis which is parallel to the Y axis.

[0176] The above configuration helps to suppress the decrease in work efficiency.

[0177] [Fourth Embodiment] A fourth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0178] <Impact wrench> Figure 6 is a side view showing the impact wrench 1D according to the fourth embodiment.

[0179] The impact wrench 1D comprises a main body housing 2D, a gear case 5D, a handle 7D, a controller 11D, a motor 10D, a reduction mechanism 13D, an impact mechanism 15D, an anvil 16D, a trigger switch 17D, a first battery mounting section 31D, and a second battery mounting section 32D.

[0180] The main housing 2D has a main body portion 21D that houses the motor 10D and a grip portion 23D provided at the rear of the main body portion 21D. The trigger switch 17D is provided on the grip portion 23D.

[0181] In this embodiment, the motor rotation axis of the motor 10D extends in the front-rear direction (X-axis direction). The rotor of the motor 10D rotates around the motor rotation axis that extends in the front-rear direction. The output rotation axis AX also extends in the front-rear direction. The motor rotation axis and the output rotation axis AX coincide.

[0182] The controller 11D is positioned behind the motor 10D. The reduction gear 13D is positioned in front of the motor 10D. The striking mechanism 15D is positioned in front of the reduction gear 13D. The anvil 16D is struck in the rotational direction by the striking mechanism 15D. The anvil 16D rotates around an output rotation axis AX that extends in the X-axis direction.

[0183] The handle 7D protrudes upward from the gear case 5D or the main body 21D.

[0184] The first battery mounting section 31D is located on the upper part of the main housing 2D. The first battery pack 33D is mounted in the first battery mounting section 31D. The first battery pack 33D can be attached to and detached from the first battery mounting section 31D.

[0185] The second battery mounting section 32D is located at the bottom of the main housing 2D. The second battery pack 34D is mounted in the second battery mounting section 32D. The second battery pack 34D can be attached to and detached from the second battery mounting section 32D.

[0186] In the X-axis direction, the first battery mounting portion 31D and the second battery mounting portion 32D are positioned substantially at the same location. In the Y-axis direction, the first battery mounting portion 31D and the second battery mounting portion 32D are positioned substantially at the same location. In the Z-axis direction, the first battery mounting portion 31D and the second battery mounting portion 32D are positioned at different locations. In this embodiment, the first battery mounting portion 31D is positioned above (towards the +Z side) the second battery mounting portion 32D.

[0187] The first battery pack 33D is installed in the first battery mounting section 31D by sliding it from the front (+X side) to the rear (-X side). The second battery pack 34D is installed in the second battery mounting section 32D by sliding it from the front (+X side) to the rear (-X side).

[0188] The first battery pack 33D may be mounted on the first battery mounting section 31D by sliding it from the rear to the front. The second battery pack 34D may be mounted on the second battery mounting section 32D by sliding it from the rear to the front.

[0189] The right end of the main housing 2D is positioned to the right of the right end of the first battery pack 33D and the right end of the second battery pack 34D. The left end of the main housing 2D is positioned to the left of the left end of the first battery pack 33D and the left end of the second battery pack 34D. In other words, the first battery pack 33D does not protrude to the right of the right end of the main housing 2D. The first battery pack 33D does not protrude to the left of the left end of the main housing 2D. The second battery pack 34D does not protrude to the right of the right end of the main housing 2D. The second battery pack 34D does not protrude to the left of the left end of the main housing 2D.

[0190] The rated voltage of the first battery pack 33D and the rated voltage of the second battery pack 34D are equal. The rated voltage of the first battery pack 33D and the rated voltage of the second battery pack 34D may each be 18V or 36V. In this embodiment, the rated voltage of the first battery pack 33D and the rated voltage of the second battery pack 34D are each 18V, with a maximum of 20V (20Vmax). Since the first battery pack 33D and the second battery pack 34D are connected in series, the voltage supplied to the motor is 36V (40Vmax).

[0191] The external dimensions and appearance of the first battery pack 33D and the second battery pack 34D are the same.

[0192] In other words, the first battery pack 33D and the second battery pack 34D are of the same type.

[0193] The structure and size of the terminals of the first battery mounting section 31D and the structure and size of the terminals of the second battery mounting section 32D are the same.

[0194] In this embodiment, the maximum tightening torque of the anvil 16D is less than 3000 Nm. Alternatively, the maximum tightening torque of the anvil 16D may be between 2000 Nm and 4000 Nm.

[0195] The specifications of the impact wrench 1D according to this embodiment are as follows:

[0196] • Total rated voltage of battery packs: Approximately 36V (40Vmax) or higher • Stator core outer diameter: 80mm or more (maximum diameter is 140mm) • Maximum tightening torque for the anvil: Approximately 3000 Nm (2000 Nm to 3000 Nm, or 3000 Nm to 4000 Nm is also acceptable) • Number of strikes in the striking mechanism: 900 rpm (700 rpm to 1500 rpm is also acceptable) • Anvil no-load rotational speed: 685 rpm (500 rpm to 1000 rpm is also acceptable) • Reduction ratio of the reduction mechanism: 1 / 33.7 (Any ratio between 1 / 25 and 1 / 40 is acceptable) • Hammer weight: 1.3kg (1kg to 1.5kg is also acceptable) • Length of one side of the socket mounting section of the anvil: 1 inch (0.5 inches or more, but 1.5 inches or less is also acceptable) • External dimensions of the impact wrench without the battery pack: Z-axis: 197mm, Y-axis: 130mm, X-axis: 456mm (It is acceptable if the Z-axis is between 180mm and 210mm, the Y-axis is between 110mm and 140mm, and the X-axis is between 400mm and 500mm) • Weight of impact wrench without battery pack: 10kg (7kg to 13kg is also acceptable)

[0197] <Effects> As described above, in this embodiment, the impact wrench 1D includes a motor 10D which is a brushless motor, an impact mechanism 15D which is rotated by the motor 10D, an anvil 16D which is struck by the impact mechanism 15D and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31D on which a first battery pack 33D is mounted, a second battery mounting section 32D on which a second battery pack 34D is mounted, and a main body housing 2D which houses the motor 10D. In a direction parallel to the Y axis which is perpendicular to the X axis, the -Y side end of the main body housing 2D is positioned to the -Y side of the -Y side of the first battery pack 33D and the -Y side end of the second battery pack 34D. The +Y side end of the main body housing 2D is positioned to the +Y side of the +Y side of the first battery pack 33D and the +Y side end of the second battery pack 34D.

[0198] The above configuration helps to suppress the decrease in work efficiency.

[0199] [Fifth Embodiment] A fifth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0200] <Impact wrench> Figure 7 is a side view showing the impact wrench 1E according to the fifth embodiment. The impact wrench 1E according to this embodiment is a modified version of the impact wrench 1D according to the fourth embodiment described above.

[0201] The impact wrench 1E comprises a main body housing 2E, a gear case 5E, a handle 7E, a controller 11E, a motor 10E, a reduction mechanism 13E, a striking mechanism 15E, an anvil 16E, a trigger switch 17E, a first battery mounting section 31E, and a second battery mounting section 32E.

[0202] The main housing 2E has a main body portion 21E that houses the motor 10E, and a grip portion 23E provided at the rear of the main body portion 21E. The trigger switch 17E is provided on the grip portion 23E.

[0203] The rotor of motor 10E rotates around a motor rotation axis that extends in the front-to-back direction. The output rotation axis AX also extends in the front-to-back direction. The motor rotation axis and the output rotation axis AX coincide.

[0204] The controller 11E is positioned behind the motor 10E. The reduction mechanism 13E is positioned in front of the motor 10E. The striking mechanism 15E is positioned in front of the reduction mechanism 13E. The anvil 16E is struck in the rotational direction by the striking mechanism 15E. The anvil 16E rotates around an output rotation axis AX that extends in the X-axis direction.

[0205] The handle 7E protrudes upward from the gear case 5E or the main body 21E.

[0206] The first battery pack 33E is installed in the first battery mounting section 31E. The first battery pack 33E can be attached to and detached from the first battery mounting section 31E. The first battery mounting section 31E is located at the bottom of the main body housing 2E.

[0207] The second battery pack 34E is installed in the second battery mounting section 32E. The second battery pack 34E can be attached to and detached from the second battery mounting section 32E. The second battery mounting section 32E is located at the bottom of the main body housing 2E.

[0208] In the X-axis direction, the first battery mounting section 31E and the second battery mounting section 32E are positioned at different locations. In this embodiment, the first battery mounting section 31E is positioned forward (towards the +X side) of the second battery mounting section 32E. In the Y-axis direction, the first battery mounting section 31E and the second battery mounting section 32E are positioned at substantially the same location. In the Z-axis direction, the first battery mounting section 31E and the second battery mounting section 32E are positioned at substantially the same location.

[0209] The first battery pack 33E is installed in the first battery mounting section 31E by sliding it from the front (+X side) to the rear (-X side). The second battery pack 34E is installed in the second battery mounting section 32E by sliding it from the rear (-X side) to the front (+X side).

[0210] The right end of the main housing 2E is positioned to the right of the right end of the first battery pack 33E and the right end of the second battery pack 34E. The left end of the main housing 2E is positioned to the left of the left end of the first battery pack 33E and the left end of the second battery pack 34E. In other words, the first battery pack 33E does not protrude to the right of the right end of the main housing 2E. The first battery pack 33E does not protrude to the left of the left end of the main housing 2E. The second battery pack 34E does not protrude to the right of the right end of the main housing 2E. The second battery pack 34E does not protrude to the left of the left end of the main housing 2E.

[0211] The rated voltage of the first battery pack 33E and the rated voltage of the second battery pack 34E are equal. The rated voltage of the first battery pack 33E and the rated voltage of the second battery pack 34E may each be 18V or 36V. In this embodiment, the rated voltage of the first battery pack 33E and the rated voltage of the second battery pack 34E are each 18V and a maximum of 20V.

[0212] The external shape and dimensions of the first battery pack 33E and the second battery pack 34E are the same.

[0213] In other words, the first battery pack 33E and the second battery pack 34E are of the same type.

[0214] The structure and size of the terminals of the first battery mounting section 31E and the structure and size of the terminals of the second battery mounting section 32E are the same.

[0215] In this embodiment, the maximum tightening torque of the anvil 16E is less than 3000 Nm. Alternatively, the maximum tightening torque of the anvil 16E may be between 2000 Nm and 4000 Nm.

[0216] The specifications of the impact wrench 1E according to this embodiment are as follows:

[0217] • Total rated voltage of battery packs: Approximately 36V (40Vmax) or higher • Stator core outer diameter: 80mm or more (maximum diameter is 140mm) • Maximum tightening torque for the anvil: Approximately 3000 Nm (2000 Nm to 3000 Nm, or 3000 Nm to 4000 Nm is also acceptable) • Number of strikes in the striking mechanism: 900 rpm (700 rpm to 1500 rpm is also acceptable) • Anvil no-load rotational speed: 685 rpm (500 rpm to 1000 rpm is also acceptable) • Reduction ratio of the reduction mechanism: 1 / 33.7 (Any ratio between 1 / 25 and 1 / 40 is acceptable) • Hammer weight: 1.3kg (1kg to 1.5kg is also acceptable) • Length of one side of the socket mounting section of the anvil: 1 inch (0.5 inches or more, but 1.5 inches or less is also acceptable) • External dimensions of the impact wrench without the battery pack: Z-axis: 197mm, Y-axis: 130mm, X-axis: 456mm (It is acceptable if the Z-axis is between 180mm and 210mm, the Y-axis is between 110mm and 140mm, and the X-axis is between 400mm and 500mm) • Weight of impact wrench without battery pack: 10kg (7kg to 13kg is also acceptable)

[0218] <Effects> As described above, in the embodiment, the impact wrench 1E includes a motor 10E which is a brushless motor, an impact mechanism 15E rotated by the motor 10E, an anvil 16E which is struck by the impact mechanism 15E and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31E to which a first battery pack 33E is attached, and a second battery mounting section 32E which is positioned differently from the first battery mounting section 31E in a direction parallel to the X axis and to which a second battery pack 34E is attached.

[0219] The above configuration helps to suppress the decrease in work efficiency.

[0220] In this embodiment, the first battery pack 33E is mounted on the first battery mounting section 31E by sliding it from the +X side to the -X side in a direction parallel to the X-axis. The second battery pack 34E is mounted on the second battery mounting section 32E by sliding it from the -X side to the +X side in a direction parallel to the X-axis.

[0221] The above configuration helps to suppress the decrease in work efficiency.

[0222] In this embodiment, the impact wrench 1E includes a main housing 2E that houses a motor 10E. In a direction perpendicular to the X-axis and parallel to the Y-axis, the -Y end of the main housing 2E is positioned to the -Y side of the -Y end of the first battery pack 33E and the -Y end of the second battery pack 34E. The +Y end of the main housing 2E is positioned to the -Y side of the +Y end of the first battery pack 33E and the +Y end of the second battery pack 34E.

[0223] The above configuration helps to suppress the decrease in work efficiency.

[0224] In this embodiment, the impact wrench 1E includes a motor 10E which is a brushless motor, an impact mechanism 15E which is rotated by the motor 10E, an anvil 16E which is struck by the impact mechanism 15E and rotates around an output rotation axis AX which extends in a direction parallel to the X axis, a first battery mounting section 31E on which a first battery pack 33E is mounted, and a second battery mounting section 32E which is located next to the first battery mounting section 31E on which a second battery pack 34E is mounted.

[0225] The above configuration helps to suppress the decrease in work efficiency.

[0226] [Sixth Embodiment] A sixth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0227] Figure 8 shows the impact wrench 1F according to the sixth embodiment.

[0228] The impact wrench 1F comprises a main housing 2F, a gear case 5F, a controller 11F, a motor 10F, a reduction mechanism 13F, an impact mechanism 15F, an anvil 16F, a trigger switch 17F, and a battery mounting section 31F. The main housing 2F and the gear case 5F are configured to extend long in the vertical direction.

[0229] The main housing 2F includes a main body section 21F that houses the motor 10F, a controller housing section 24F provided on the upper part of the main body section 21F, and a grip section 23F provided on the upper part of the controller housing section 24F. The main body section 21F is an example of a rod section. The controller housing section 24F is an example of a head section. The trigger switch 17E is located on the grip section 23E. The vertical length from the upper end of the grip section 23F to the lower end of the anvil 16F is set to approximately 1000mm to 1800mm. Furthermore, the impact wrench 1F is easier to use if the vertical length from the upper end of the grip section 23F to the lower end of the anvil 16F is between 1200mm and 1600mm.

[0230] The rotor of motor 10F rotates around the motor rotation axis, which extends vertically. The output rotation axis AX also extends vertically. The motor rotation axis and the output rotation axis AX coincide. The output shaft of the reduction mechanism 13F also coincides with the motor rotation axis and the output rotation axis AX.

[0231] The controller 11F is positioned above the motor 10F. The controller 11F is housed in the controller housing 24F.

[0232] The grip section 23F is located on the upper left and upper right sides of the controller housing section 24F, respectively. The trigger switch 17F is located on the right-hand grip section 23F.

[0233] The battery mounting section 31F and the controller 11F are connected by a battery power supply line 201. The controller 11F and the motor 10F are connected by a motor power supply line 202. The trigger switch 17F and the controller 11F are connected by a trigger signal line 203.

[0234] The reduction gear 13F and the striking mechanism 15F are each housed in the gear case 5F. The gear case 5F is positioned below the main housing 2F. A separate hammer case can be provided to house the striking mechanism 15F. In this case, the hammer case would be positioned below the gear case 5F.

[0235] The reduction gear 13F is positioned below the motor 10F. The impact mechanism 15F is positioned below the reduction gear 13F. The anvil 16F is struck in the rotational direction by the impact mechanism 15F. The lower end of the anvil 16F protrudes downward from the lower end of the gear case 5F. The anvil 16F rotates around the output rotation axis AX, which extends in the Z-axis direction.

[0236] The battery pack 33F is installed in the battery mounting section 31F. The battery pack 33F can be attached to and detached from the battery mounting section 31F. The battery mounting section 31F is located above the controller housing section 24F of the main body housing 2F.

[0237] The battery pack 33F is installed in the battery mounting section 31F by sliding it from the rear side (-X side) to the front side (+X side).

[0238] The rated voltage of the battery pack 33F may be 18V or 36V. In this embodiment, the rated voltage of the battery pack 33F is 36V, with a maximum of 40V.

[0239] In this embodiment, the maximum tightening torque of the anvil 16F is less than 3000 Nm.

[0240] Figure 9 is a plan view showing an impact wrench 1F according to the sixth embodiment. The grip portion 23F includes a right grip portion 23F1 and a left grip portion 23F2. In the impact wrench 1F, the right grip portion 23F1 is located to the right of the controller housing portion 24F. The left grip portion 23F2 is located to the left of the controller housing portion 24F.

[0241] The right grip portion 23F1, together with the controller housing portion 24F, has a loop shape. The right grip portion 23F1 has a portion 23F11 that extends to the right (side) from the front of the controller housing portion 24F, a portion 23F12 that extends to the right (side) from the rear of the controller housing portion 24F, and a portion 23F13 that connects portion 23F11 and portion 23F12.

[0242] The left grip portion 23F2, together with the controller housing portion 24F, has a loop shape. The left grip portion 23F2 has a portion 23F21 extending to the left (side) from the front of the controller housing portion 24F, a portion 23F22 extending to the left (side) from the rear of the controller housing portion 24F, and a portion 23F23 connecting portions 23F21 and 23F22.

[0243] The trigger switch 17F is located at the front of section 23F13. When the trigger switch 17F is operated, the motor 10F is energized. The motor 10F rotates as a result of operating the trigger switch 17F.

[0244] A forward / lock / reverse switch 101 is located to the right of the battery pack 33F in the controller housing 24F. The forward / lock / reverse switch 101 can be operated in the forward and backward directions. When the forward / lock / reverse switch 101 is positioned forward, the motor 10F can rotate in the forward direction. When the forward / lock / reverse switch 101 is positioned rearward, the motor 10F can rotate in the reverse direction. When the forward / lock / reverse switch 101 is positioned in the middle of the forward and backward directions, the motor 10F cannot rotate (it does not rotate in either the forward or reverse direction).

[0245] A panel 300 is located behind the battery pack 33F in the controller housing 24F. At least a portion of the panel 300 is displayable and operable. The display is made using one or more LEDs (which may be of different colors). Buttons for operation are located on the panel.

[0246] Panel 300 is long from left to right. Panel 300 is made of a separate resin from the controller housing 24F. On panel 300, the following are arranged from left to right: battery remaining capacity indicator LED 301, mode selection button 302, mode indicator LED 303, speed change button 304, and speed indicator LED 305.

[0247] The battery capacity indicator LED 301 has four LED chips arranged in a row, front and back. When the last LED is lit, the battery pack 33F has 25% capacity remaining. When the two rear LEDs are lit, the battery pack 33F has 50% capacity remaining. When three LEDs are lit, the battery pack 33F has 75% capacity remaining. When all four LEDs are lit, the battery pack 33F has 100% capacity remaining. This battery capacity indicator LED 301 lights up when the trigger switch 17F is operated while the battery pack 33F is installed in the battery mounting section 31F.

[0248] The mode selection button 302 is a push-down switch. When the mode selection button 302 is pressed down, a signal is input to the controller 11F. When the signal is input to the controller 11F, the motor 10F rotates in the selected rotation mode.

[0249] There are three rotation modes. The first is the automatic stop mode. In automatic stop mode, motor 10F automatically stops rotating under predetermined conditions. These predetermined conditions can be arbitrarily set, such as when a specified tightening torque is reached, when 5 seconds have passed since the specified current value for motor 10F was reached, or when 30 seconds have passed since motor 10F started rotating.

[0250] The second is the multi-speed mode. An example of multi-speed is setting the rotation speed of the motor 10F to, for example, 10,000 rpm, 20,000 rpm, 30,000 rpm, and 40,000 rpm.

[0251] The third mode is boost mode. For example, when rotating motor 10F in the reverse direction, more torque is expected to be required. This is because it becomes necessary to loosen nuts that have become stuck due to rust or other reasons. Pressing this mode selection button 302 allows the motor to rotate at 120% of its initial rotation speed. If the initial motor rotation speed is 10,000 rpm, the rotation speed per minute will increase to 12,000 rpm, for example.

[0252] The mode indicator LED 303 displays the mode selected by the mode selection button 302. When only the front LED is lit, it indicates that the automatic stop mode is selected. When only the middle LED is lit, it indicates that the multi-speed mode is selected. When only the rear LED is lit, it indicates that the multi-speed mode is selected.

[0253] The speed change button 304 is a push-down switch that allows you to change the motor's rotation speed, for example, 10,000 rpm, 20,000 rpm, 30,000 rpm, and 40,000 rpm. Pressing it once changes the speed to 10,000 rpm, pressing it twice changes it to 20,000 rpm, pressing it three times changes it to 30,000 rpm, pressing it four times changes it to 40,000 rpm, and pressing it five times changes it to 10,000 rpm, and so on.

[0254] The speed indicator LED305 shows the following when only the leftmost LED is lit: 10,000 revolutions per minute; 20,000 revolutions per minute when the two leftmost LEDs are lit; 30,000 revolutions per minute when all three LEDs are lit; and 40,000 revolutions per minute when all four LEDs are lit.

[0255] The following are also inventions according to this embodiment. A head section capable of holding the battery pack, Loop-shaped grips are positioned on the left and right sides of the head portion, A rod portion extending downward from the head portion, A motor positioned at the front of the rod portion, A reduction unit is located below the motor, A striking mechanism is positioned below the deceleration unit, The striking mechanism comprises an anvil that is struck in the rotational direction by the striking mechanism. Impact tools.

[0256] The specifications of the impact wrench 1F according to this embodiment are as follows:

[0257] • Total rated voltage of battery packs: 18V (20Vmax) or higher (18V to 36V is acceptable) • Stator core outer diameter: 50mm or more • Maximum tightening torque for the anvil: Approximately 1700 Nm (800 Nm to 2000 Nm is acceptable) • Number of strikes in the striking mechanism: 2500 rpm (any speed between 2000 rpm and 3000 rpm is acceptable) • Anvil no-load rotational speed: 1800 rpm (any speed between 1200 rpm and 2400 rpm is acceptable) • Reduction ratio of the reduction mechanism: 1 / 15.7 (Any ratio between 1 / 12 and 1 / 20 is acceptable) • Hammer weight: 0.4kg (0.2kg to 0.6kg is also acceptable) • Length of one side of the socket mounting section of the anvil: 1 inch (any length between 0.25 inches and 1 inch is acceptable) • External dimensions of the impact wrench without the battery pack: X-axis: 322mm, Y-axis: 408mm, Z-axis: 1300mm (Z-axis: 1000mm to 1800mm is acceptable) • Weight of impact wrench without battery pack: 5kg

[0258] [Seventh Embodiment] A seventh embodiment will now be described. In the following description, the same or equivalent components as those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0259] Figure 10 shows the impact wrench 1G according to the seventh embodiment.

[0260] The impact wrench 1G comprises a main body housing 2G, a gear case 5G, a controller 11G, a motor 10G, a reduction mechanism 13G, an impact mechanism 15G, an anvil 16G, a trigger switch 17G, and a battery mounting section 31G.

[0261] The main body housing 2G has a main body portion 21G that houses the motor 10G, two arm portions 25 provided on the upper part of the main body portion 21G, and a grip portion 23G provided on the upper part of the arm portion 25. The trigger switch 17G is provided on the grip portion 23G.

[0262] The rotor of the motor 10G rotates about a motor rotation axis extending in the vertical direction. The output rotation axis AX also extends in the vertical direction. The motor rotation axis and the output rotation axis AX coincide.

[0263] The controller 11G is disposed above the motor 10G. The controller 11G is housed in the main body portion 21G.

[0264] The speed reduction mechanism 13G is housed in the main body portion 21G. The striking mechanism 15G is housed in the gear case 5G. The gear case 5G is disposed below the main body housing 2G.

[0265] The speed reduction mechanism 13G is disposed below the motor 10G. The striking mechanism 15G is disposed below the speed reduction mechanism 13G. The anvil 16G is struck in the rotational direction by the striking mechanism 15G. The lower end portion of the anvil 16G protrudes downward from the lower end portion of the gear case 5G. A socket 100 is attached to the lower end portion of the anvil 16G. The anvil 16G rotates about the output rotation axis AX extending in the Z-axis direction.

[0266] The battery pack 33G is attached to the battery attachment portion 31G. The battery pack 33G is detachable from the battery attachment portion 31G. The battery attachment portion 31G is provided on the upper part of the main body housing 2G.

[0267] The battery pack 33G is attached to the battery attachment portion 31G by sliding from the rear side (-X side) to the front side (+X side) with respect to the battery attachment portion 31G.

[0268] The rated voltage of the battery pack 33G may be 18V, 36V, or 72V. In this embodiment, the rated voltage of the battery pack 33G is 72V, with a maximum of 80V.

[0269] In this embodiment, the maximum tightening torque of the anvil 16G is less than 3000 Nm.

[0270] The specifications of the impact wrench 1G according to this embodiment are as follows:

[0271] • Total rated voltage of battery pack: Approximately 75V or higher • Stator core outer diameter: 80mm or more • Maximum tightening torque of the anvil: Approximately 7500 Nm • Number of strikes in the striking mechanism: 1000 rpm Anvil no-load rotational speed: 761 rpm • Reduction ratio of the reduction mechanism: 1 / 39.4 • Hammer weight: 4.5kg • Length of one side of the socket mounting section of the anvil: 1.5 inches • External dimensions of the impact wrench without the battery pack: 540mm in the X-axis direction x 219mm in the Y-axis direction x 854mm in the Z-axis direction • Weight of impact wrench without battery pack: 30kg

[0272] The specifications of the impact wrench 1G according to this embodiment may be as follows.

[0273] • Total rated voltage of battery pack: Approximately 75V or higher • Stator core outer diameter: 80mm or more • Maximum tightening torque of the anvil: Approximately 7500 Nm • Number of strikes in the striking mechanism: 1500 rpm Anvil no-load rotational speed: 1150 rpm • Reduction ratio of the reduction mechanism: 1 / 26.3 • Hammer weight: 2.0kg • Length of one side of the socket mounting section of the anvil: 1.5 inches • External dimensions of the impact wrench without the battery pack: 540mm in the X-axis direction x 219mm in the Y-axis direction x 854mm in the Z-axis direction • Weight of impact wrench without battery pack: 30kg [Explanation of Symbols]

[0274] 1A…Impact wrench, 1B…Impact wrench, 1C…Impact wrench, 1D…Impact wrench, 1E…Impact wrench, 1F…Impact wrench, 1G…Impact wrench, 2A…Main housing, 2B…Main housing, 2C…Main housing, 2D…Main housing, 2E…Main housing, 2F…Main housing, 2G…Main housing, 2L…Left main housing, 2R…Right main housing, 3…First battery connection housing, 3C…Battery connection housing, 4…Motor case, 5…Gear case, 5D…Gear case, 5E…Gear case 5F...Gear case, 5G...Gear case, 6...Hammer case, 7...Side handle, 7A...Handle section, 7B...Base section, 7D...Handle, 7E...Handle, 8...Bumper, 9...Suspension ring, 10A...Motor, 10D...Motor, 10E...Motor, 10F...Motor, 10G...Motor, 11A...Controller, 11D...Controller, 11E...Controller, 11F...Controller, 11G...Controller, 12...Fan, 13A...Reduction mechanism, 13D...Reduction mechanism, 13E...Reduction mechanism, 13F...Reduction mechanism, 13G...Reduction mechanism, 14...Spindle, 14A...Flange Part, 14B...Spindle shaft part, 14C...Protruding part, 15A...Striking mechanism, 15D...Striking mechanism, 15E...Striking mechanism, 15F...Striking mechanism, 15G...Striking mechanism, 16A...Anvil, 16B...Anvil, 16C...Anvil, 16D...Anvil, 16E...Anvil, 16F...Anvil, 16G...Anvil, 17A...Trigger switch, 17B...Trigger switch, 17C...Trigger switch, 17D...Trigger switch, 17E...Trigger switch, 17F...Trigger switch, 17G...Trigger switch, 18...Light assembly, 21...Main body part, 21D...Main body part, 21E...Main body Part, 21F...Main body part, 21G...Main body part, 22A...Second battery connection housing, 22B...Battery connection housing, 22C...Protruding part, 23...Grip part, 23A...Rear grip part, 23B...Upper grip part, 23D...Grip part, 23E...Grip part, 23F...Grip part, 23F1...Right grip part, 23F11...Part, 23F12...Part, 23F13...Part, 23F2...Left grip part, 23F21...Part, 23F22...Part, 23F23...Part, 23G...Grip part, 24...Controller housing part, 24F...Controller housing part, 25...Arm part, 26...Air intake,27…Exhaust port, 31A…First battery mounting section, 31B…First battery mounting section, 31C…First battery mounting section, 31D…First battery mounting section, 31E…First battery mounting section, 31F…Battery mounting section, 31G…Battery mounting section, 32A…Second battery mounting section, 32B…Second battery mounting section, 32C…Second battery mounting section, 32D…Second battery mounting section, 32E…Second battery mounting section, 33A…First battery pack, 33B…First battery pack, 33C…First battery pack, 33D… 1st battery pack, 33E…1st battery pack, 33F…Battery pack, 33G…Battery pack, 34A…2nd battery pack, 34B…2nd battery pack, 34C…2nd battery pack, 34D…2nd battery pack, 34E…2nd battery pack, 40…Bearing cover, 40S…Screw, 41…Screw, 45…Spring, 46…Cushion rubber, 47…Stator, 48…Rotor, 49…Rotor shaft, 50…Sensor board, 51…Rotor bearing, 52…Rotor bearing, 53...First bevel gear, 54...Second bevel gear, 55...Planetary gear mechanism, 55A...Pin, 55I...Internal gear, 55P...Planetary gear, 55S...Sun gear, 56...Gear bearing, 57...Gear bearing, 58...Spindle bearing, 61...First cylindrical section, 62...Second cylindrical section, 63...Front wall section, 71...Hammer, 71A...Hammer body, 71B...Hammer projection, 71C...Recess, 72...Ball, 73...First coil spring, 74...Second coil spring, 75...Third coil spring, 76...First washer 77...Second washer, 78...Ball, 79...Anvil bearing, 100...Socket, 101...Forward / lock / reverse switch, 161...Anvil shaft section, 162...Anvil projection, 201...Battery power supply line, 202...Motor power supply line, 203...Trigger signal line, 300...Panel, 301...Battery remaining capacity indicator LED, 302...Mode selection button, 303...Mode indicator LED, 304...Speed ​​change button, 305...Speed ​​indicator LED, MX...Motor rotation shaft, AX...Output rotation shaft.

Claims

1. An anvil that rotates around an output rotation axis extending in the vertical direction and to which a socket can be attached, A hammer capable of striking the anvil in the rotational direction, and at least a portion of which is positioned above the anvil, A brushless motor is positioned above the hammer, having a rotor that rotates around a motor rotation axis extending in the vertical direction to rotate the hammer, and a stator facing the rotor. A controller that controls the rotation of the rotor, A case that houses the hammer and from which the lower end of the anvil protrudes, A rod portion housing the aforementioned brushless motor, The rod portion and the brushless motor are positioned above the aforementioned rod portion, the rod portion is fixed to it, and the head portion is thicker than the rod portion, It has a trigger switch for rotating the rotor, a left grip portion extending to the left from the left side of the head portion, and a right grip portion extending to the right from the right side of the head portion, The rotor is equipped with a forward / reverse switch for changing the direction of rotation, One of the rod portions is positioned below the head portion and above the case, and is fixed to the head portion and the case. The head portion is, A battery mounting section from which the battery pack can be attached and detached by sliding the battery pack, The panel, positioned at the top and extending long to the left and right, includes a speed change button for changing the rotation speed of the brushless motor, and a speed indicator LED having multiple LEDs that light up according to the rotation speed of the brushless motor selected by the speed change button. The rod portion is further provided with a power supply line that supplies power from the battery mounting portion to the brushless motor. Impact wrench.

2. The aforementioned battery pack has a rated voltage of 18V. The impact wrench according to claim 1.

3. The stator has a stator core having an outer diameter of 50 mm or more. The impact wrench according to claim 1.

4. The system further comprises a reduction mechanism positioned between the brushless motor and the hammer in the vertical direction, The reduction mechanism has a reduction ratio of 1 / 12 to 1 / 20. The impact wrench according to claim 1.

5. The anvil has a maximum tightening torque of 800 Nm or more and 3000 Nm or less. The impact wrench according to claim 1.

6. The anvil has a prismatic shape, The impact wrench according to claim 1.

7. The anvil has a socket mounting portion on which the socket can be attached, The length of one side of the socket mounting portion is 1 inch. The impact wrench according to claim 6.

8. The controller can select an automatic stop mode in which the brushless motor automatically stops rotating. The impact wrench according to claim 1.

9. The aforementioned forward / reverse switch has a lock switch and can be operated in the operating direction. When the forward / reverse switch is positioned at one end of the operating direction, the brushless motor can rotate in the forward direction; when it is positioned at the other end of the operating direction, the brushless motor can rotate in the reverse direction; and when it is positioned in the middle of the operating direction, the brushless motor cannot rotate. The impact wrench according to claim 1.

10. The case comprises a reduction mechanism housed within the aforementioned case. The impact wrench according to claim 1.

11. An anvil that rotates around an output rotation axis extending in the vertical direction and to which a socket can be attached, A hammer capable of striking the anvil in the rotational direction, and at least a portion of which is positioned above the anvil, A brushless motor is positioned above the hammer, having a rotor that rotates around a motor rotation axis extending in the vertical direction to rotate the hammer, and a stator facing the rotor. A controller that controls the rotation of the rotor, A case that houses the hammer and from which the lower end of the anvil protrudes, A rod portion housing the aforementioned brushless motor, The rod portion and the brushless motor are positioned above the aforementioned rod portion, the rod portion is fixed to it, and the head portion is thicker than the rod portion, It has a trigger switch for rotating the rotor, and comprises a left grip portion extending to the left from the left side of the head portion and a right grip portion extending to the right from the right side of the head portion, One of the rod portions is positioned below the head portion and above the case, and is fixed to the head portion and the case. The controller can select an automatic stop mode in which the brushless motor automatically stops rotating. The head portion is, A battery mounting section from which the battery pack can be attached and detached by sliding the battery pack, The panel located on top includes a speed change button for changing the rotation speed of the brushless motor, and a speed indicator LED having multiple LEDs that light up according to the rotation speed of the brushless motor selected by the speed change button. The rod portion is further provided with a power supply line that supplies power from the battery mounting portion to the brushless motor. Impact wrench.

Images