Electric tool

Abstract

To prevent a battery pack of an electric tool from vibrating.SOLUTION: An electric tool comprises: a motor; a body housing which accommodates the motor; a first elastic member which is supported by the body housing; a battery housing which is supported by the first elastic member; a battery holder with a battery pack which is movably supported by the battery housing; and a second elastic member which suppresses relative displacement between the battery housing and the battery pack mounted on the battery holder.SELECTED DRAWING: Figure 22

Description

[Technical field]

[0001] The technology disclosed in this specification relates to power tools. [Background technology]

[0002] In the technical field related to electric power tools, an impact tool as disclosed in Patent Document 1 is known. The impact tool disclosed in Patent Document 1 has a motor, a housing including the motor, a battery receptacle including an independent member, and an elastomer damper. The independent member is capable of mounting a battery pack and has a rail portion, and the rail portion is slidably supported by a channel formed in the housing. When an impact is applied, the independent member moves along the housing, applies an impact to the elastomer damper, and reduces movement due to vibration from the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent Application Publication No. 2021 / 0237249 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, it is said that an elastic body with low hardness is good for absorbing vibrations, but when an impact is applied to the device, if the elastic body has low hardness, it will easily collapse and will not be able to absorb all of the impact, so a certain degree of hardness is required for the elastic body to absorb the impact. In the conventional technology, it is necessary to achieve both impact absorption and vibration reduction using an elastomer damper provided in the housing, and if the hardness of the elastomer damper is reduced to reduce vibrations, the battery pack may be displaced significantly due to an impact such as a fall, and may come into direct contact with the housing and be damaged. On the other hand, if the hardness of the elastomer damper is ensured to absorb impacts, the vibration reduction function is reduced and the terminal may be damaged due to vibrations during operation. In addition, in the conventional technology, the rail part of the battery holder is supported by the rail part of the main body housing so that it can translate in the front-rear direction of the main body (the same direction as the insertion and removal direction of the battery pack). Rubber is provided on the main body housing, and when the battery holder moves in the front-rear direction of the main body, it comes into contact with the rubber to reduce the impact. However, in this configuration, the battery holder can only move in the front-to-back direction of the main body, and cannot move up-down or left-right, and therefore cannot absorb the directional components of the unit's practical vibrations. The effects of these vibrations are transmitted directly to the battery pack and terminals, causing premature wear on the terminals.

[0005] The technology disclosed in this specification aims to provide vibration isolation for a battery pack of a power tool. [Means for solving the problem]

[0006] This specification discloses an electric power tool. The electric power tool may include a motor, a main housing that accommodates the motor, a first elastic member supported by the main housing, a battery housing supported by the first elastic member, a battery holder to which a battery pack is attached and which is movably supported by the battery housing, and a second elastic member that suppresses relative movement between the battery housing and the battery pack attached to the battery holder. Effect of the Invention

[0007] According to the technology disclosed in this specification, the battery pack of the power tool is vibration-proofed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an impact tool according to an embodiment, seen from the left front side. [Diagram 2] FIG. 2 is a perspective view showing the impact tool according to the embodiment, seen from the right rear side. [Diagram 3] FIG. 3 is a view of the impact tool according to the embodiment as viewed from the right side. [Figure 4] FIG. 4 is a view of the impact tool according to the embodiment as viewed from the left side. [Diagram 5] FIG. 5 is a view of the impact tool according to the embodiment as viewed from the rear side. [Figure 6] FIG. 6 is a view of the impact tool according to the embodiment as viewed from the front side. [Figure 7] FIG. 7 is a view of the impact tool according to the embodiment as viewed from above. [Figure 8] FIG. 8 is a view of the impact tool according to the embodiment as viewed from below. [Figure 9] FIG. 9 is a cross-sectional view showing an impact tool according to the embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing an impact tool according to an embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 12] FIG. 12 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 13] FIG. 13 is an exploded perspective view showing the light assembly according to the embodiment, as viewed from the right front side. [Figure 14] FIG. 14 is an exploded perspective view showing the light assembly according to the embodiment, seen from the left rear side. [Figure 15] FIG. 15 is a perspective view showing the axial elastic body according to the embodiment, seen from the right front side. [Figure 16]FIG. 16 is a perspective view showing the axial elastic body according to the embodiment, seen from the left rear side. [Figure 17] FIG. 17 is a perspective view showing the light emitter unit according to the embodiment, seen from the right front side. [Figure 18] FIG. 18 is a perspective view showing the light emitter unit according to the embodiment, seen from the left rear side. [Figure 19] FIG. 19 is a perspective view showing a radial elastic body according to the embodiment, seen from the right front side. [Figure 20] FIG. 20 is a perspective view showing a radial elastic body according to the embodiment, seen from the rear left side. [Figure 21] FIG. 21 is an enlarged cross-sectional view of a portion of a light assembly according to an embodiment. [Figure 22] FIG. 22 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Diagram 23] FIG. 23 is a cross-sectional view showing a part of the impact tool according to the embodiment. [Figure 24] FIG. 24 is an exploded perspective view showing the impact tool according to the embodiment, as viewed from the right front side. [Diagram 25] FIG. 25 is an exploded perspective view showing the impact tool according to the embodiment, seen from the left rear side. [Figure 26] FIG. 26 is a perspective view showing the battery housing according to the embodiment, seen from the right front side. [Figure 27] FIG. 27 is a perspective view showing the battery housing according to the embodiment, seen from the rear left side. [Figure 28] FIG. 28 is an exploded perspective view showing the battery housing according to the embodiment, as viewed from the right front side. [Figure 29] FIG. 29 is an exploded perspective view showing the battery housing according to the embodiment, seen from the rear left side. [Diagram 30] FIG. 30 is an exploded perspective view showing the battery housing according to the embodiment, as viewed from the right front side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In one or more embodiments, the power tool may include a motor, a main body housing that accommodates the motor, a first elastic member supported by the main body housing, a battery housing supported by the first elastic member, a battery holder to which a battery pack is attached and which is movably supported on the battery housing, and a second elastic member that suppresses relative movement between the battery housing and the battery pack attached to the battery holder.

[0010] In the above configuration, the first elastic member and the second elastic member are provided, and thus the hardness of the first elastic member and the hardness of the second elastic member can be set separately. For example, the hardness of the first elastic member can be set low to ensure a vibration reduction function, and the hardness of the second elastic member can be set higher than the hardness of the first elastic member to ensure a required shock absorption performance. The first elastic member isolates the battery pack from vibration, and the second elastic member absorbs the shock acting on the battery pack when, for example, the power tool is dropped.

[0011] In one or more embodiments, the second elastic member may include a cushion rubber supported by the battery housing and capable of contacting the battery pack.

[0012] In the above configuration, for example, when the power tool is dropped, the shock acting on the battery pack is absorbed by the cushion rubber.

[0013] In one or more embodiments, the second elastic member may include a spring supported by the battery housing and biasing the battery holder in a direction away from the cushion rubber.

[0014] In the above configuration, for example, when the power tool is dropped, the shock acting on the battery pack is absorbed by the cushion rubber, and the battery pack can then be returned to its initial position by the biasing force of the spring.

[0015] In one or more embodiments, when no external force is applied to the battery holder in a direction approaching the cushion rubber, the battery holder is positioned in an initial position by the spring force, and when the battery holder is positioned in the initial position, the cushion rubber and the battery pack attached to the battery holder are separated, and when an external force is applied to the battery holder in a direction approaching the cushion rubber, the cushion rubber and the battery pack attached to the battery holder may come into contact.

[0016] In the above configuration, when no external force is applied to the battery holder, the spring suppresses the relative movement between the battery housing and the battery pack, and when an external force is applied to the battery holder, the cushion rubber suppresses the relative movement between the battery housing and the battery pack.

[0017] In one or more embodiments, the battery pack may be attached to the battery holder by sliding it forward relative to the battery holder, and the cushion rubber may be disposed on the front side of the battery pack.

[0018] In the above configuration, when an external force is applied to the battery holder and the battery pack moves forward, the impact acting on the battery pack is absorbed by the cushion rubber.

[0019] In one or more embodiments, the battery housing may have a guide portion that guides a slide portion provided on the battery holder.

[0020] In the above configuration, the battery holder can move smoothly relative to the battery housing.

[0021] In one or more embodiments, the battery housing may include a left battery housing and a right battery housing, and the guide portion may be provided on each of the left battery housing and the right battery housing.

[0022] In the above configuration, the battery holder can move smoothly relative to the battery housing.

[0023] In one or more embodiments, the battery holder may hold terminals having terminal ends that connect with battery terminals of the battery pack.

[0024] In the above configuration, the shock acting on the terminal is absorbed by the cushion rubber.

[0025] In one or more embodiments, the battery holder may include a left battery holder and a right battery holder, and the terminal may be sandwiched between the left battery holder and the right battery holder.

[0026] In the above configuration, the terminal is held in the battery holder.

[0027] In one or more embodiments, the first elastic member may be a rod-like member extending in three different directions.

[0028] In the above configuration, vibrations acting on the battery pack in three directions (front-back, up-down, and left-right) are damped.

[0029] In one or more embodiments, the first resilient member may be disposed between the body housing and the battery housing.

[0030] With the above configuration, vibrations of the main body housing are prevented from being transmitted to the battery housing.

[0031] In one or more embodiments, the first elastic member may have a retaining groove, and the main housing may have a retaining protrusion that is inserted into the retaining groove.

[0032] In the above configuration, the first elastic member is held by the main body housing.

[0033] In one or more embodiments, the battery housing may have a retention recess in which the first resilient member is disposed.

[0034] In the above configuration, the first elastic member is held by the battery housing.

[0035] In one or more embodiments, the body housing includes a left body housing and a right body housing, and the first elastic member may be disposed between the left body housing and the battery housing, and between the right body housing and the battery housing, respectively.

[0036] With the above configuration, the vibration of the main body housing is effectively prevented from being transmitted to the battery housing.

[0037] In one or more embodiments, the power tool may include a motor, an impact mechanism disposed on the front side of the motor, an anvil that is struck in a rotational direction by the impact mechanism, a D-shaped handle disposed on the rear side of the motor, a battery holder to which a battery pack is attached, a battery housing connected to the D-shaped handle and supporting the battery holder, and a cushion rubber supported by the battery housing and capable of contacting the battery pack.

[0038] In the above configuration, in a large impact tool having a D-shaped handle, the cushion rubber reduces the impact acting on the battery pack when, for example, the large impact tool is dropped.

[0039] In one or more embodiments, the battery holder may be supported in the battery housing so as to be movable in a forward and backward direction.

[0040] In the above configuration, in a large impact tool having a D-shaped handle, for example, if the large impact tool is dropped and an impact is applied to the battery pack, the battery holder moves, thereby mitigating the impact acting on the battery pack.

[0041] In one or more embodiments, the power tool may include a spring supported on the battery housing and biasing the battery holder away from the cushion rubber.

[0042] In the above configuration, for example, when a large impact tool is dropped, the shock acting on the battery pack is absorbed by the cushion rubber, and the battery pack can then be returned to its initial position by the biasing force of the spring.

[0043] In one or more embodiments, the electric power tool may include a motor, a main body housing that accommodates the motor, and a battery holder that is supported on the main body housing via rod-shaped elastic members extending in three different directions and to which a battery pack is attached.

[0044] In the above configuration, vibrations acting on the battery pack in three directions (front-back, up-down, and left-right) are damped.

[0045] In one or more embodiments, the rod-shaped elastic members extending in three different directions may be integral.

[0046] With the above configuration, deterioration in workability when assembling the power tool is suppressed.

[0047] In one or more embodiments, the power tool may include a battery housing disposed between the main body housing and the battery holder. The elastic member may be disposed between the main body housing and the battery housing. The battery holder may be supported on the main body housing via the elastic member and the battery housing.

[0048] With the above configuration, vibrations acting on the battery pack in three directions (front-back, up-down, and left-right) are effectively damped.

[0049] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment. The components of the embodiments described below can be appropriately combined. In addition, some components may not be used.

[0050] In the embodiment, the positional relationship of each part will be described using the terms "left", "right", "front", "rear", "upper", and "lower". These terms indicate relative positions or directions based on the center of the impact tool 1. The left-right direction, the front-rear direction, and the up-down direction are perpendicular to each other.

[0051] The impact tool 1 has a motor 10 and an anvil 16 which is an output part of the impact tool 1. The rotation shaft of the motor 10 is appropriately referred to as a motor rotation shaft MX, and the rotation shaft of the anvil 16 is appropriately referred to as an output rotation shaft AX. The motor rotation shaft MX extends in the up-down direction. The output rotation shaft AX extends in the front-rear direction.

[0052] A direction parallel to the output rotation shaft AX is appropriately referred to as the axial direction, a direction going around the output rotation shaft AX is appropriately referred to as the circumferential direction or the rotation direction, and a radial direction of the output rotation shaft AX is appropriately referred to as the radial direction. In addition, in the radial direction, a position close to or approaching the output rotation shaft AX is appropriately referred to as the radial inner direction, and a position far from or away from the output rotation shaft AX is appropriately referred to as the radial outer direction.

[0053] [Impact tools] FIG. 1 is a perspective view of the impact tool 1 according to the embodiment from the left front side. FIG. 2 is a perspective view of the impact tool 1 according to the embodiment from the right rear side. FIG. 3 is a view of the impact tool 1 according to the embodiment from the right side. FIG. 4 is a view of the impact tool 1 according to the embodiment from the left side. FIG. 5 is a view of the impact tool 1 according to the embodiment from the rear side. FIG. 6 is a view of the impact tool 1 according to the embodiment from the front side. FIG. 7 is a view of the impact tool 1 according to the embodiment from the top side. FIG. 8 is a view of the impact tool 1 according to the embodiment from the bottom side. FIG. 9 is a cross-sectional view of the impact tool 1 according to the embodiment, which corresponds to the cross-sectional view of the line BB in FIG. 7. FIG. 10 is a cross-sectional view of the impact tool 1 according to the embodiment, which corresponds to the cross-sectional view of the line AA in FIG. 3. FIG. 11 is a cross-sectional view of a part of the impact tool according to the embodiment, which corresponds to an enlarged view of a part of FIG. 9. FIG. 12 is a cross-sectional view of a part of the impact tool 1 according to the embodiment, which corresponds to an enlarged view of a part of FIG. 10.

[0054] The impact tool 1 is a type of power tool using an electric motor 10 as a drive source. In the embodiment, the impact tool 1 is an impact wrench, which is a type of fastening tool. The impact tool 1 includes a main body housing 2, a battery housing 3, a motor case 4, a gear case 5, a hammer case 6, a side handle 7, a bumper 8, a battery holder 9, a motor 10, a controller 11, a fan 12, a reduction mechanism 13, a spindle 14, a striking mechanism 15, an anvil 16, a trigger switch 17, a light assembly 18, an interface panel 19, and a hook assembly 20.

[0055] The main body housing 2 accommodates a motor case 4. The main body housing 2 accommodates a part of a gear case 5. The main body housing 2 is connected to a battery housing 3. The main body housing 2 is fixed to a hammer case 6.

[0056] The main body housing 2 is made of synthetic resin. An example of the synthetic resin that forms the main body housing 2 is nylon resin. The main body housing 2 includes a left main body housing 2L and a right main body housing 2R. The right main body housing 2R is disposed to the right of the left main body housing 2L. The left main body housing 2L and the right main body housing 2R form a pair of half-split housings. The left main body housing 2L and the right main body housing 2R are fixed together by a plurality of screws 2S.

[0057] The main housing 2 has a main body portion 21 , a protruding portion 22 , a grip portion 23 , a controller accommodating portion 24 , and a panel holding portion 25 .

[0058] The main body portion 21 accommodates the motor case 4. The main body portion 21 accommodates a part of the gear case 5.

[0059] The protrusion 22 protrudes downward from the main body 21. The protrusion 22 is disposed on the front side of the battery housing 3.

[0060] The grip portion 23 is held by an operator. The grip portion 23 is disposed on the rear side of the main body portion 21. The grip portion 23 includes a rear grip portion 23A extending upward from the rear portion of the controller housing portion 24, and an upper grip portion 23B extending forward from the upper end portion of the rear grip portion 23A. The lower end portion of the rear grip portion 23A is connected to the controller housing portion 24, and the upper end portion of the rear grip portion 23A is connected to the rear end portion of the upper grip portion 23B. The front end portion of the upper grip portion 23B is connected to the upper portion of the main body portion 21. The grip portion 23, the main body portion 21, and the controller housing portion 24 form a D-shaped handle. The D-shaped handle is disposed on the rear side of the motor 10. The trigger switch 17 is disposed on the upper portion of the rear grip portion 23A.

[0061] The controller housing portion 24 houses the controller 11 .

[0062] The panel holder 25 holds the interface panel 19 .

[0063] The battery housing 3 supports a battery holder 9. The battery housing 3 is connected to the main body housing 2 so as to be movable relative to the main body housing 2. The battery housing 3 is made of synthetic resin. An example of the synthetic resin that forms the battery housing 3 is nylon resin.

[0064] The battery housing 3 is disposed below the controller accommodating portion 24. The battery housing 3 is disposed behind the protruding portion 22. The battery housing 3 is connected to the D-shaped handle.

[0065] The battery housing 3 includes a left battery housing 3L and a right battery housing 3R. The right battery housing 3R is disposed on the right side of the left battery housing 3L. The left battery housing 3L and the right battery housing 3R form a pair of half-split housings. The left battery housing 3L and the right battery housing 3R are fixed together by a plurality of screws 3S. The battery holder 9 is sandwiched between the left battery housing 3L and the right battery housing 3R.

[0066] The motor case 4 houses the motor 10. The motor case 4 is disposed below the gear case 5. The motor case 4 is fixed to the gear case 5.

[0067] The motor case 4 is made of synthetic resin. An example of the synthetic resin that forms the motor case 4 is polycarbonate resin.

[0068] The motor case 4 has a cylindrical portion 4A disposed around the motor 10, and a bottom wall portion 4B disposed at the bottom end of the cylindrical portion 4A.

[0069] The gear case 5 accommodates at least a part of the reduction gear mechanism 13. The gear case 5 is disposed on the rear side of the hammer case 6. The gear case 5 is fixed to the hammer case 6.

[0070] The gear case 5 is made of a metal. Examples of the metal that forms the gear case 5 include aluminum and magnesium.

[0071] The gear case 5 is substantially cylindrical. An opening is provided in the front part of the gear case 5. An opening is provided in the rear part of the gear case 5. An opening is provided in the lower part of the gear case 5. A bearing cover 40 is disposed in the opening in the rear part of the gear case 5. The bearing cover 40 is fixed to the rear part of the gear case 5 by screws 40S.

[0072] The hammer case 6 houses the striking mechanism 15 including the hammer 71. The hammer case 6 is connected to the front part of the main body housing 2. The hammer case 6 is connected to the front part of the gear case 5.

[0073] The hammer case 6 is made of a metal. An example of the metal that forms the hammer case 6 is aluminum.

[0074] 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 disposed around the striking mechanism 15 including the hammer 71. The second cylindrical portion 62 is disposed forward of 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 portion of the gear case 5 is inserted into an opening provided at the rear end portion of the first cylindrical portion 61. The front wall portion 63 connects the front end portion of the first cylindrical portion 61 and the rear end portion of the second cylindrical portion 62.

[0075] The main body housing 2, the gear case 5, and the hammer case 6 are fixed together by a plurality of screws 41. The main body housing 2 has a plurality of screw bosses 2B. The gear case 5 has a plurality of screw bosses 5B. The hammer case 6 has a plurality of screw bosses 6B. The screws 41 are inserted into through holes provided in the screw bosses 2B of the main body housing 2 and through holes provided in the screw bosses 5B of the gear case 5. The screws 41 are inserted into threaded holes provided in the screw bosses 6B of the hammer case 6. The screws 41 are inserted from the rear of the screw boss 2B into the through holes of the screw boss 2B and the through holes of the screw boss 5B, and then inserted into the threaded holes of the screw boss 6B.

[0076] An opening is provided in the upper part of the motor case 4. An opening is provided in the lower part of the gear case 5. The internal spaces of the motor case 4 and the gear case 5 are connected via the upper opening of the motor case 4 and the lower opening of the gear case 5. The motor case 4 and the gear case 5 are fixed together with a plurality of screws (not shown).

[0077] An opening is provided in the front part of the gear case 5. An opening is provided in the rear part 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 in the front part of the gear case and the opening in the rear part of the hammer case 6.

[0078] The side handle 7 is held by an operator. The side handle 7 has a handle portion 7A held by the operator and a base portion 7B fixed to the hammer case 6. The handle portion 7A is disposed on the left side of the hammer case 6. The base portion 7B includes a first base portion 7C and a second base portion 7D disposed below the first base portion 7C. Each of the first base portion 7C and the second base portion 7D is arc-shaped. The first base portion 7C and the second base portion 7D are disposed so as to sandwich the first cylindrical portion 61 of the hammer case 6. The right end portion of the first base portion 7C and the right end portion of the second base portion 7D are connected via a hinge 7E. Each of the left end portion of the first base portion 7C and the left end portion of the second base portion 7D is connected to the handle portion 7A.

[0079] The left end of the first base portion 7C and the left end of the second base portion 7D are connected via a fastening mechanism 42. The fastening mechanism 42 has a screw 42A disposed in a screw hole provided in the left end of the second base portion 7D and a dial 42B rotatable relative to the screw 42A. The operator can rotate the dial 42B by operating the dial 42B. By rotating the dial 42B, the distance between the left end of the first base portion 7C and the left end of the second base portion 7D is adjusted. By rotating the screw 42A so that the distance between the left end of the first base portion 7C and the left end of the second base portion 7D is shortened, the hammer case 6 is fastened to the base portion 7B, and the side handle 7 is fixed to the hammer case 6.

[0080] In the embodiment, the handle portion 7A is disposed to the left of the hammer case 6, but the handle portion 7A can be disposed in any position around the hammer case 6. For example, the handle portion 7A can be disposed to the left of the hammer case 6, can be disposed above the hammer case 6, or can be disposed below the hammer case 6. The position (angle) of the handle portion 7A relative to the hammer case 6 can be adjusted 360 degrees.

[0081] The bumper 8 is disposed so as to cover at least a portion of the surface of the hammer case 6. In the embodiment, the bumper 8 is disposed so as to cover the surface of the first cylindrical portion 61. The bumper 8 protects the hammer case 6. The bumper 8 suppresses contact between the hammer case 6 and objects around the impact tool 1. The bumper 8 is formed of an elastic body that is softer than the hammer case 6. An example of the elastic body that forms the bumper 8 is styrene-butadiene rubber.

[0082] The battery holder 9 holds the battery pack 43. The battery pack 43 is attached to and detached from the battery holder 9. The controller housing 24 is disposed above the battery pack 43 attached to the battery holder 9. The protrusion 22 is disposed on the front side of the battery pack 43 attached to the battery holder 9. The battery pack 43 functions as a power source for the impact tool 1. The battery pack 43 includes a secondary battery. In the embodiment, the battery pack 43 includes a rechargeable lithium-ion battery. By being attached to the battery holder 9, the battery pack 43 can supply power to the impact tool 1. The motor 10 is driven based on the power supplied from the battery pack 43. The controller 11 operates based on the power supplied from the battery pack 43.

[0083] The battery holder 9 holds a plate-shaped terminal 44. The terminal 44 has a synthetic resin plate and a terminal that is a metal connection terminal disposed on the plate. When the battery pack 43 is attached to the battery holder 9, the battery terminal that is the connection terminal of the battery pack 43 and the terminal of the terminal 44 are connected to each other.

[0084] The battery housing 3 holds a spring 45 and a cushion rubber 46. The spring 45 is disposed on the front side of the battery holder 9. The cushion rubber 46 is disposed on the front side of the battery pack 43 held by the battery holder 9. The spring 45 biases the battery holder 9 rearward. The cushion rubber 46 is disposed on the front side of the battery pack 43 attached to the battery holder 9. The cushion rubber 46 is disposed forward of the battery pack 43 attached to the battery holder 9. The cushion rubber 46 can come into contact with the front part of the battery pack 43. For example, when the impact tool 1 is dropped, the elastic force of the spring 45 reduces the impact acting on the terminal 44, and the cushion rubber 46 reduces the impact acting on the battery pack 43.

[0085] The motor 10 functions as a power source for the impact tool 1. The motor 10 is an inner rotor type DC brushless motor. The motor 10 has a stator 47, a rotor 48, and a rotor shaft 49. The stator 47 is supported by the motor case 4. At least a portion of the rotor 48 is disposed inside the stator 47. The rotor shaft 49 is fixed to the rotor 48. The rotor 48 is rotatable relative to the stator 47 around a motor rotation axis MX extending in the vertical direction.

[0086] Stator 47 has a stator core having a plurality of teeth, and a plurality of coils wound around each of the plurality of teeth of the stator core via insulators. The plurality of coils are connected via a bus bar unit.

[0087] The rotor 48 rotates about a motor rotation axis MX. The rotor 48 has a rotor core and a rotor magnet fixed to the rotor core.

[0088] A sensor board 50 is fixed to the insulator of the stator 47. The sensor board 50 detects the position of the rotor 48 in the rotational direction. The sensor board 50 has a rotation detection element supported by an annular circuit board. The rotation detection element detects the position of the rotor magnet of the rotor 48, thereby detecting the position of the rotor 48 in the rotational direction.

[0089] The rotor shaft 49 is fixed to a rotor core of the rotor 48. The rotor 48 and the rotor shaft 49 rotate together about the motor rotation axis MX.

[0090] The rotor shaft 49 is rotatably supported by both the rotor bearing 51 and the rotor bearing 52. The rotor bearing 51 rotatably supports an upper portion of the rotor shaft 49 that protrudes upward beyond the upper end surface of the rotor 48. The rotor bearing 52 rotatably supports a lower portion of the rotor shaft 49 that protrudes downward beyond the lower end surface of the rotor 48. The rotor bearing 51 is held by the gear case 5. The rotor bearing 52 is held by the motor case 4.

[0091] A first bevel gear 53 is fixed to an upper end of the rotor shaft 49. The first bevel gear 53 is connected to at least a part of the reduction mechanism 13. The rotor shaft 49 is connected to the reduction mechanism 13 via the first bevel gear 53.

[0092] The controller 11 outputs a control signal for controlling the motor 10. The controller 11 includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a central processing unit (CPU), a non-volatile memory such as a read only memory (ROM) or storage, a volatile memory such as a random access memory (RAM), a field effect transistor (FET), and a resistor.

[0093] The controller 11 is accommodated in the controller accommodating portion 24. In the controller accommodating portion 24, the controller 11 is held in a controller case 11A.

[0094] The fan 12 generates an airflow for cooling the motor 10 and the controller 11. The fan 12 is disposed above the stator 47. The fan 12 is fixed to an upper portion of the rotor shaft 49. The fan 12 is disposed between the rotor bearing 51 and the stator 47. The fan 12 and the rotor shaft 49 rotate together.

[0095] An intake port 26 is provided in the controller housing 24. An exhaust port 27 is provided in the upper part of the main body 21. An air vent 4C is provided in the rear part of the motor case 4. When the fan 12 rotates, air from the external space of the main body housing 2 flows into the internal space of the controller housing 24 through the intake port 26. The air that flows into the internal space of the controller housing 24 cools the controller 11 by circulating through the internal space of the controller housing 24. The air that flows through the internal space of the controller housing 24 flows into the internal space of the motor case 4 through the air vent 4C by the rotation of the fan 12. The air that flows into the internal space of the motor case 4 cools the motor 10 by circulating through the internal space of the motor case 4. At least a part of the air that flows through the internal space of the motor case 4 flows out to the external space of the motor case 4 through the exhaust port 27 by the rotation of the fan 12.

[0096] The reduction mechanism 13 transmits the rotational force of the motor 10 to the impact mechanism 15 via the spindle 14. The reduction mechanism 13 connects the rotor shaft 49 and the spindle 14. The reduction mechanism 13 rotates the spindle 14 at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0097] The reduction mechanism 13 has 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 10 transmitted via the second bevel gear 54.

[0098] The planetary gear mechanism 55 has a sun gear 55S, a planetary gear 55P, and an internal gear 55I. A plurality of planetary gears 55P are provided. The plurality of planetary gears 55P are disposed around the sun gear 55S. The internal gear 55I is disposed around the plurality of planetary gears 55P. The planetary gear mechanism 55 is housed in a gear case 5.

[0099] The second bevel gear 54 is disposed 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 can rotate around an output rotation shaft AX extending in the front-rear direction. The output rotation shaft AX and the motor rotation shaft MX are perpendicular to each other. 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 by the bearing cover 40. The gear bearing 57 is held by the gear case 5. The rotor shaft 49 rotates to rotate the first bevel gear 53, thereby rotating the second bevel gear 54. The second bevel gear 54 rotates to rotate the sun gear 55S.

[0100] Each of the multiple planetary gears 55P meshes with the sun gear 55S. The planetary gear 55P is rotatably supported on the spindle 14 via a pin 55A. The spindle 14 is rotated by the planetary gear 55P. The internal gear 55I has internal teeth that mesh with the planetary gear 55P. The internal gear 55I is fixed to the gear case 5. A plurality of protrusions are provided on the outer peripheral surface of the internal gear 55I. The protrusions of the internal gear 55I fit into recesses provided on the inner peripheral surface of the gear case 5. The internal gear 55I is always non-rotatable relative to the gear case 5.

[0101] When the rotor shaft 49 and the first bevel gear 53 are rotated by the drive of the motor 10, the second bevel gear 54 and the sun gear 55S are rotated. 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 revolution of the planetary gear 55P, the spindle 14 connected to the planetary gear 55P via the pin 55A rotates at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0102] The spindle 14 rotates by the rotational force of the motor 10 transmitted by the reduction mechanism 13. The spindle 14 transmits the rotational force of the motor 10 transmitted via the reduction mechanism 13 to the impact mechanism 15. The spindle 14 is rotatable about an output rotation shaft AX. A rear portion of the spindle 14 is housed in the gear case 5. A front portion of the spindle 14 is housed in the hammer case 6. At least a portion of the spindle 14 is disposed on the front side of the reduction mechanism 13. The spindle 14 is disposed on the rear side of the anvil 16.

[0103] 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.

[0104] The planetary gear 55P is rotatably supported by the flange portion 14A and the protruding portion 14C via the pin 55A. The spindle 14 is rotatably supported by a spindle bearing 58. The spindle bearing 58 rotatably supports the protruding portion 14C. The spindle bearing 58 is held by the gear case 5.

[0105] The striking mechanism 15 strikes the anvil 16 in the rotational direction about the output rotation shaft AX. The striking mechanism 15 is disposed on the front side of the motor 10. The striking mechanism 15 is driven by the motor 10. The striking mechanism 15 is rotatable about the output rotation shaft AX. The rotational force of the motor 10 is transmitted to the striking mechanism 15 via the reduction mechanism 13 and the spindle 14. The striking mechanism 15 strikes the anvil 16 in the rotational direction based on the rotational force of the spindle 14 rotated by the motor 10.

[0106] The striking mechanism 15 is housed in the first cylindrical portion 61 of the hammer case 6. The striking mechanism 15 has 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.

[0107] The hammer 71 is disposed on the front side of the reduction gear mechanism 13. The hammer 71 is disposed around the spindle shaft portion 14B. The hammer 71 is held by the spindle shaft portion 14B. The hammer 71 is rotated by the motor 10. The ball 72 is disposed between the spindle shaft portion 14B and the hammer 71. The hammer 71 has a cylindrical hammer body 71A and a hammer protrusion portion 71B provided on the front portion of the hammer body 71A. An annular recess 71C is provided on the rear surface of the hammer body 71A. The recess 71C is recessed forward from the rear surface of the hammer body 71A.

[0108] The hammer 71 is rotated by the motor 10. The rotational force of the motor 10 is transmitted to the hammer 71 via the reduction mechanism 13 and the spindle 14. The hammer 71 is rotatable together with the spindle 14 based on the rotational force of the spindle 14 rotated by the motor 10. Each of the hammer 71 and the spindle 14 rotates about the output rotation axis AX.

[0109] The first washer 76 is disposed inside the recess 71C. The first washer 76 is supported by the hammer 71 via a plurality of balls 78. The balls 78 are disposed on the front side of the first washer 76.

[0110] The second washer 77 is disposed inside the recess 71C and on the rear side of 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.

[0111] The first coil spring 73 is disposed 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 disposed 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.

[0112] The second coil spring 74 is disposed around the spindle shaft portion 14B. The second coil spring 74 is disposed radially inward of the first coil spring 73. The 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 disposed 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 rearward.

[0113] The third coil spring 75 is disposed around the spindle shaft portion 14B. The third coil spring 75 is disposed radially inward of the first coil spring 73. The third coil spring 75 is disposed 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 rearward. The elastic force of the third coil spring 75 presses the rear end of the second coil spring 74 against the flange portion 14A. This prevents the second coil spring 74 from moving freely relative to the flange portion 14A.

[0114] The ball 72 is made of a metal such as steel. The ball 72 is disposed between the spindle shaft portion 14B and the hammer 71. The spindle 14 has a spindle groove 14D in which at least a portion of the ball 72 is disposed. The spindle groove 14D is provided on a portion of the outer surface of the spindle shaft portion 14B. The hammer 71 has a hammer groove 71D in which at least a portion of the ball 72 is disposed. The hammer groove 71D is provided on a portion of the inner surface of the hammer 71. The ball 72 is disposed between the spindle groove 14D and the hammer groove 71D. The ball 72 can roll on the inside of the spindle groove 14D and the inside of the hammer groove 71D. The hammer 71 can move along with the ball 72. The spindle 14 and the hammer 71 can move relatively in a direction parallel to the output rotation shaft AX and in a rotational direction about the output rotation shaft AX within a movable range defined by the spindle groove 14D and the hammer groove 71D.

[0115] The anvil 16 is an output part of the impact tool 1 that rotates based on the rotational force of the motor 10. At least a portion of the anvil 16 is disposed in front of the hammer 71. The anvil 16 is struck by the hammer 71 of the striking mechanism 15 in the rotational direction.

[0116] The anvil 16 has an anvil recess 16A. The anvil recess 16A is provided at the rear end of the anvil 16. The anvil recess 16A is recessed forward from the rear end of the anvil 16. The spindle 14 is disposed behind the anvil 16. The front end of the spindle shaft portion 14B is disposed in the anvil recess 16A.

[0117] The anvil 16 has an anvil shaft portion 16B and an anvil protrusion portion 16C. The anvil shaft portion 16B is disposed on the front side of the striking mechanism 15. The anvil protrusion portion 16C protrudes from the rear end portion of the anvil shaft portion 16B radially outward from the anvil shaft portion 16B. The anvil protrusion portion 16C is struck by the striking mechanism 15 in the rotational direction about the output rotation shaft AX.

[0118] The front end of the anvil shaft portion 16B is disposed on the front side of the hammer case 6 through the front opening of the second cylindrical portion 62. A socket is attached as a tip tool to the front end of the anvil shaft portion 16B.

[0119] The anvil 16 is rotatably supported by an anvil bearing 79. The anvil bearing 79 is arranged around the anvil shaft portion 16B. The anvil 16 is rotatable around the output rotation axis AX. The anvil bearing 79 is held by the hammer case 6. The anvil bearing 79 is arranged inside the second cylindrical portion 62 of the hammer case 6. The anvil bearing 79 is held by the second cylindrical portion 62 of the hammer case 6.

[0120] In the embodiment, the anvil bearing 79 is a sliding bearing. The anvil bearing 79 is cylindrical. In the embodiment, a sleeve is used as the anvil bearing 79. Note that the sliding bearing may be formed by impregnating a cylindrical porous metal body manufactured by powder metallurgy, for example, with a lubricating oil.

[0121] In a cross section perpendicular to the output rotation axis AX, the outer circumferential surface of the anvil shaft portion 16B has a circular shape. In a cross section perpendicular to the output rotation axis AX, the inner circumferential surface of the anvil bearing 79 has a circular shape.

[0122] A first groove portion 16D is formed on the outer circumferential surface of the anvil shaft portion 16B. The first groove portion 16D is formed on the outer circumferential surface of the anvil shaft portion 16B so as to surround the output rotation shaft AX.

[0123] A groove portion 79A is formed in the inner circumferential surface of the anvil bearing 79. The groove portion 79A is formed in the inner circumferential surface of the anvil bearing 79 so as to surround the output rotation shaft AX.

[0124] An O-ring 80 is disposed between the first groove portion 16D and the groove portion 79A. The O-ring 80 prevents the anvil shaft portion 16B from slipping forward from the hammer case 6. The O-ring 80 contacts the inner surface of the first groove portion 16D and the inner surface of the groove portion 79A. The O-ring 80 is slightly crushed by the inner surfaces of the first groove portion 16D and the groove portion 79A. The O-ring 80 seals the boundary between the anvil shaft portion 16B and the anvil bearing 79.

[0125] The hammer case 6 has a bearing support surface 6A that contacts the front end of the anvil bearing 79. The bearing support surface 6A is provided at the front end of the second cylindrical portion 62. The bearing support surface 6A faces rearward. The bearing support surface 6A presses the anvil bearing 79 from the front. The bearing support surface 6A prevents the anvil bearing 79 from slipping out forward from the hammer case 6. In a plane perpendicular to the output rotation axis AX, the bearing support surface 6A is ring-shaped. An opening at the front end of the second cylindrical portion 62 is defined radially inward from the bearing support surface 6A.

[0126] The front end of the anvil shaft portion 16B 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 16B is positioned inside the opening at the front end of the second cylindrical portion 62. A seal member 81 is provided at the front end of the second cylindrical portion 62. The seal member 81 is positioned inside the front end of the second cylindrical portion 62. The seal member 81 seals the boundary between the front end of the second cylindrical portion 62 and the anvil shaft portion 16B. The seal member 81 is positioned forward of the O-ring 80.

[0127] The anvil shaft portion 16B has a second groove portion 16E disposed rearward of the first groove portion 16D. The section modulus of the anvil shaft portion 16B in the second groove portion 16E is smaller than that of the anvil shaft portion 16B in the first groove portion 16D. That is, the section modulus of the anvil shaft portion 16B passing through the second groove portion 16E and perpendicular to the output rotation axis AX is smaller than that of the anvil shaft portion 16B passing through the first groove portion 16D and perpendicular to the output rotation axis AX. In the anvil shaft portion 16B, the second groove portion 16E is the portion having the lowest strength against bending moment. That is, in the anvil shaft portion 16B, the second groove portion 16E is the portion most likely to break when a high load acts on the anvil shaft portion 16B.

[0128] The second groove portion 16E is formed on the outer circumferential surface of the anvil shaft portion 16B. The second groove portion 16E is formed rearward of the first groove portion 16D. The second groove portion 16E is formed on the outer circumferential surface of the anvil shaft portion 16B so as to surround the output rotation shaft AX.

[0129] The depth of the second groove portion 16E is deeper than the depth of the first groove portion 16D. The depth of the second groove portion 16E refers to the dimension of the second groove portion 16E in the radial direction.

[0130] For example, when a high load acts on the anvil shaft portion 16B during fastening work, at least a part of the anvil shaft portion 16B may break. In the embodiment, the second groove portion 16E is provided in the anvil shaft portion 16B. Therefore, when a high load acts on the anvil shaft portion 16B, the anvil shaft portion 16B breaks at the second groove portion 16E.

[0131] If the anvil shaft portion 16B breaks at the second groove portion 16E, there is a possibility that the anvil shaft portion 16B in front of the second groove portion 16E will move forward relative to the hammer case 6. When the anvil shaft portion 16B moves forward, at least a part of the inner surface of the first groove portion 16D and at least a part of the inner surface of the groove portion 79A will get caught on the O-ring 80.

[0132] The front end of the anvil bearing 79 contacts the bearing support surface 6A of the hammer case 6. Even if the anvil shaft portion 16B breaks, the anvil bearing 79 does not move forward relative to the hammer case 6. The O-ring 80 is caught on at least a part of the inner surface of the first groove portion 16D and at least a part of the inner surface of the groove portion 79A. The O-ring 80 also does not move forward relative to the hammer case 6. The anvil shaft portion 16B is caught on the O-ring 80, which does not move forward relative to the hammer case 6. Therefore, when the anvil shaft portion 16B breaks at the second groove portion 16E, the anvil shaft portion 16B is prevented from falling out forward from the hammer case 6. That is, when the anvil shaft portion 16B breaks, the anvil shaft portion 16B in front of the second groove portion 16E is prevented from falling out of the impact tool 1.

[0133] The trigger switch 17 is operated by an operator to drive the motor 10. Driving the motor 10 means that the coil of the stator 47 is energized to rotate the rotor 48. The trigger switch 17 is provided on the upper part of the rear grip part 23A. The trigger switch 17 includes a trigger lever 17A and a switch body 17B. The switch body 17B is disposed in the internal space of the rear grip part 23A. The trigger lever 17A protrudes forward from the upper part of the front part of the rear grip part 23A. The trigger lever 17A is operated by an operator so as to move backward. The motor 10 is driven by operating the trigger lever 17A so as to move backward. The driving of the motor 10 is stopped by releasing the operation of the trigger lever 17A.

[0134] The light assembly 18 emits illumination light. The light assembly 18 illuminates the anvil 16 and the periphery of the anvil 16 with illumination light. The light assembly 18 illuminates the front of the anvil 16 with illumination light. The light assembly 18 also illuminates the socket attached to the anvil 16 and the periphery of the socket with illumination light. The light assembly 18 is disposed around the second cylindrical portion 62 of the hammer case 6.

[0135] The interface panel 19 includes, for example, an operation button for selecting a light emission mode of the light assembly 18. The interface panel 19 includes, for example, a display unit for displaying the remaining capacity of the battery pack 43.

[0136] The hook assembly 20 is hooked onto an object. The hook assembly 20 has a base portion 20A and a ring portion 20B. The base portion 20A is fixed to an upper portion of the main housing 2. In the embodiment, the base portion 20A has a through hole into which a screw 41 is inserted. The screw 41 is inserted into a through hole of the screw boss 2B via the through hole of the base portion 20A. The base portion 20A is fixed to an upper portion of the main housing 2 by being sandwiched between the head of the screw 41 and the screw boss 2B. The ring portion 20B is arranged so as to protrude upward from the base portion 20A. By inserting at least a part of the object into the base portion 20A, the impact tool 1 is suspended from the object via the hook assembly 20.

[0137] [Light Assembly] FIG. 13 is an exploded perspective view of the light assembly 18 according to the embodiment from the right front side. FIG. 14 is an exploded perspective view of the light assembly 18 according to the embodiment from the left rear side. FIG. 15 is a perspective view of the axial elastic body according to the embodiment from the right front side. FIG. 16 is a perspective view of the axial elastic body according to the embodiment from the left rear side. FIG. 17 is a perspective view of the light emitter unit according to the embodiment from the right front side. FIG. 18 is a perspective view of the light emitter unit according to the embodiment from the left rear side. FIG. 19 is a perspective view of the radial elastic body according to the embodiment from the right front side. FIG. 20 is a perspective view of the radial elastic body according to the embodiment from the left rear side. FIG. 21 is a cross-sectional view of an enlarged portion of the light assembly 18 according to the embodiment.

[0138] The light assembly 18 includes a light emitter unit 90 , an axial elastic body 91 , a radial elastic body 92 , a washer 93 , and a ring spring 94 .

[0139] The light emitter unit 90 includes chip on board light emitting diodes (COB LEDs) 95 and an optical member 96 .

[0140] The chip-on-board light-emitting diode 95 includes a substrate 95A, an LED chip 95B which is a light-emitting body, a bank 95C, and a phosphor 95D.

[0141] The light emitting unit 90 including the LED chip 95B irradiates the front end side of the anvil 16. The light emitting unit 90 is disposed around at least a portion of the second cylindrical portion 62.

[0142] The substrate 95A is annular. The substrate 95A is disposed around the anvil shaft portion 16B via the second tubular portion 62. The substrate 95A is provided so as to surround the anvil shaft portion 16B. Examples of the substrate 95A include an aluminum substrate, a glass cloth-based epoxy resin substrate (FR-4 substrate), and a composite substrate epoxy resin substrate (CEM-3 substrate). In the embodiment, a plurality of recesses 95F are provided on the inner edge of the substrate 95A. The recesses 95F are provided so as to be recessed radially outward from the inner edge of the substrate 95A. A plurality of recesses 95F are provided at intervals in the circumferential direction of the substrate 95A. In the embodiment, six recesses 95F are provided at intervals in the circumferential direction of the substrate 95A.

[0143] The LED chip 95B is mounted on the front surface of the substrate 95A. The LED chip 95B is disposed on at least a portion of the periphery of the anvil shaft portion 16B via the second tube portion 62. A plurality of LED chips 95B are disposed at intervals in the circumferential direction of the substrate 95A. In the embodiment, 36 LED chips 95B are disposed at equal intervals in the circumferential direction of the substrate 95A. Alternatively, 60 or 72 LED chips 95B may be disposed at equal intervals in the circumferential direction of the substrate 95A. The LED chips 95B and the substrate 95A are connected via gold wires (not shown). The gold wires connect the plurality of LED chips 95B to each other.

[0144] The bank 95C is provided on the front surface of the substrate 95A. The bank 95C protrudes forward from the front surface of the substrate 95A. The bank 95C defines a partitioned space in which the phosphor 95D is disposed. The bank 95C is disposed around the LED chip 95B. The bank 95C is disposed radially inward and radially outward from the LED chip 95B. The bank 95C is annular. In the embodiment, the bank 95C is provided to have a double annular shape. That is, in the embodiment, the bank 95C includes a first annular bank 95C provided on the front surface of the substrate 95A and a second annular bank 95C provided on the front surface of the substrate 95A radially outward from the first bank 95C. The first bank 95C is disposed radially inward from the LED chip 95B. The second bank 95C is disposed radially outward from the LED chip 95B. The plurality of LED chips 95B are disposed between the first bank 95C and the second bank 95C.

[0145] The phosphor 95D is disposed on the front surface of the substrate 95A. The phosphor 95D is disposed inside the bank 95C so as to cover the LED chips 95B. The phosphor 95D is annular. The phosphor 95D is disposed between the first bank 95C and the second bank 95C so as to cover each of the LED chips 95B.

[0146] A pair of electrodes are disposed on the rear surface of the substrate 95A outside the bank 95C. Of the pair of electrodes, one electrode is a positive electrode and the other electrode is a negative electrode. A pair of lead wires 95E are connected to the substrate 95A. The electrodes are connected to the lead wires 95E. The pair of lead wires 95E are supported on the rear surface of the substrate 95A. Alternatively, the electrodes may be disposed on the front surface of the substrate 95A and the lead wires 95E may be supported on the front surface of the substrate 95A.

[0147] The current output from the battery pack 43 is supplied to the electrodes via the controller 11 and lead wires 95E. The voltage of the battery pack 43 is stepped down by the controller 11 and then applied to the electrodes. The current supplied to the electrodes is supplied to the LED chip 95B via the substrate 95A and gold wires. The LED chip 95B emits light based on the current supplied from the battery pack 43.

[0148] The optical member 96 is disposed so as to face the front surface of the LED chip 95B. The light emitted from the LED chip 95B passes through the optical member 96. The optical member 96 is connected to the chip-on-board light-emitting diode 95. The optical member 96 is fixed to the substrate 95A.

[0149] The optical member 96 is made of polycarbonate resin. In the embodiment, the optical member 96 is made of polycarbonate resin containing a white diffusing material. The optical member 96 is milky white. The light transmittance of the optical member 96 is 40% or more and 70% or less. Since the optical member 96 is milky white, the outer shape of the LED chip 95B is difficult to see from the outside of the impact tool 1. Since the outer shape of the LED chip 95B is difficult to see, the design of the impact tool 1 is improved.

[0150] At least a portion of the optical member 96 is disposed forward of the chip-on-board light emitting diode 95. The optical member 96 has a first outer cylinder portion 96A, a second outer cylinder portion 96B, a first inner cylinder portion 96C, a second inner cylinder portion 96D, a light transmitting portion 96E, a convex portion 96F, and a snap fit 96G.

[0151] The first outer cylinder portion 96A and the second outer cylinder portion 96B are disposed radially outward of the first inner cylinder portion 96C and the second inner cylinder portion 96D. The first outer cylinder portion 96A and the second outer cylinder portion 96B are disposed on the outer periphery side of the chip-on-board light-emitting diode 95. The first inner cylinder portion 96C and the second inner cylinder portion 96D are disposed on the inner periphery side of the chip-on-board light-emitting diode 95. In the radial direction, the chip-on-board light-emitting diode 95 is disposed between the first outer cylinder portion 96A and the second outer cylinder portion 96B and the first inner cylinder portion 96C and the second inner cylinder portion 96D.

[0152] The first outer cylinder portion 96A is disposed radially outward from the base plate 95A. The second outer cylinder portion 96B is disposed forward from the first outer cylinder portion 96A. The inner diameter of the second outer cylinder portion 96B is smaller than the inner diameter of the first outer cylinder portion 96A. A step is provided at the boundary between the front end of the first outer cylinder portion 96A and the rear end of the second outer cylinder portion 96B. The outer edge portion of the front surface of the base plate 95A is supported by the step at the boundary between the front end of the first outer cylinder portion 96A and the rear end of the second outer cylinder portion 96B.

[0153] The first inner cylinder portion 96C is disposed radially inward from the substrate 95A. The second inner cylinder portion 96D is disposed forward from the first inner cylinder portion 96C. The inner diameter of the second inner cylinder portion 96D is smaller than the inner diameter of the first inner cylinder portion 96C. A step is provided at the boundary between the front end portion of the first inner cylinder portion 96C and the rear end portion of the second inner cylinder portion 96D. The inner edge portion of the front surface of the substrate 95A is supported by the step at the boundary between the front end portion of the first inner cylinder portion 96C and the rear end portion of the second inner cylinder portion 96D.

[0154] The light transmitting portion 96E is disposed forward of the chip-on-board light emitting diode 95. The light transmitting portion 96E is annular. The light transmitting portion 96E is disposed forward of the LED chip 95B. The light transmitting portion 96E is disposed so as to connect the front end of the second outer tube portion 96B and the front end of the second inner tube portion 96D. The light transmitting portion 96E faces the front surface of the substrate 95A. The light transmitting portion 96E faces the LED chip 95B. The light emitted from the LED chip 95B passes through the light transmitting portion 96E and is irradiated to the front side of the light emitting body unit 90.

[0155] The light transmitting portion 96E has an incident surface through which light from the LED chip 95B is incident, and an exit surface through which light transmitted through the light transmitting portion 96E exits. The front surface of the substrate 95A faces the incident surface of the light transmitting portion 96E. The incident surface faces the LED chip 95B. The incident surface faces substantially rearward. The exit surface faces substantially forward.

[0156] The convex portion 96F is disposed on the inner peripheral side of the light transmitting portion 96E. The convex portion 96F is provided so as to protrude forward from the second inner cylinder portion 96D. The convex portion 96F is disposed on the forward side of the emission surface of the light transmitting portion 96E. The convex portion 96F is annular.

[0157] The rear surface of the substrate 95A is disposed forward of the rear end of the first outer cylinder portion 96A and the rear end of the first inner cylinder portion 96C. The optical member 96 and the substrate 95A of the chip-on-board light-emitting diode 95 are fixed by a fastener. The fastener includes a snap fit 96G provided on the optical member 96. The snap fit 96G protrudes from the inner circumferential side toward the rear side from the incident surface of the light transmitting portion 96E. A plurality of snap fits 96G are provided at intervals in the circumferential direction of the optical member 96. In the embodiment, six snap fits 96G are provided at intervals in the circumferential direction of the optical member 96. The snap fits 96G are inserted into each of the six recesses 95F. The snap fits 96G are inserted into the recesses 95F to fix the optical member 96 and the substrate 95A of the chip-on-board light-emitting diode 95.

[0158] The axial elastic body 91 and the radial elastic body 92 are each made of rubber. The axial elastic body 91 and the radial elastic body 92 each suppress the vibration of the hammer case 6 from being transmitted to the light emitting unit 90. The axial elastic body 91 and the radial elastic body 92 each function as a vibration isolating member that attenuates the vibration input to the light emitting unit 90.

[0159] The radial elastic body 92 is annular. The radial elastic body 92 is disposed so as to surround the anvil shaft portion 16B. The radial elastic body 92 is disposed so as to surround the second cylindrical portion 62.

[0160] The radial elastic body 92 is supported by the hammer case 6. The radial elastic body 92 supports the light emitting body unit 90 from the radial inside. The radial elastic body 92 has a radial base portion 92A that is disposed between the second cylindrical portion 62 and the light emitting body unit 90 in the radial direction. The radial base portion 92A is cylindrical. The radial base portion 92A is disposed around the second cylindrical portion 62.

[0161] The radial base portion 92A has an inner peripheral surface facing the outer peripheral surface of the second tube portion 62, and a radial rib portion 92D protruding radially inward from the inner peripheral surface of the radial base portion 92A. A plurality of radial rib portions 92D are provided at intervals in the circumferential direction. The radial rib portion 92D contacts the outer peripheral surface of the second tube portion 62. The inner peripheral surface of the radial base portion 92A is separated from the outer peripheral surface of the second tube portion 62. The outer peripheral surface of the radial base portion 92A contacts the inner peripheral surface of the light emitter unit 90. In the embodiment, the inner peripheral surface of the light emitter unit 90 is the inner peripheral surface of the optical member 96.

[0162] The radial elastic body 92 has a rear support portion 92B that supports the light emitting body unit 90 from the rear side, and a front support portion 92C that supports the light emitting body unit 90 from the front side. The rear support portion 92B is connected to the rear end portion of the radial base portion 92A. The rear support portion 92B protrudes radially outward from the rear end portion of the radial base portion 92A. The front support portion 92C is connected to the front end portion of the radial base portion 92A. The front support portion 92C protrudes radially outward from the front end portion of the radial base portion 92A. Each of the rear support portion 92B and the front support portion 92C is annular. The radial base portion 92A, the rear support portion 92B, and the front support portion 92C are integral with each other.

[0163] The rear support portion 92B has a rear surface facing the front surface of the front wall portion 63, a ring-shaped protrusion 92E protruding rearward from the rear surface of the rear support portion 92B, and a first axial rib portion 92F protruding rearward from the rear surface of the rear support portion 92B. The ring-shaped protrusion 92E is provided on the outer edge of the rear surface of the rear support portion 92B. The first axial rib portion 92F is provided radially inward from the ring-shaped protrusion 92E. A plurality of first axial rib portions 92F are provided at intervals in the circumferential direction. The ring-shaped protrusion 92E and the first axial rib portion 92F contact the front surface of the front wall portion 63. The rear surface of the rear support portion 92B is separated from the front surface of the front wall portion 63. The front surface of the rear support portion 92B contacts the rear surface of the light emitter unit 90. In the embodiment, the front surface of the rear support portion 92B contacts the rear surface of the first inner cylinder portion 96C of the optical member 96.

[0164] The rear surface of the front support portion 92C contacts the front surface of the light emitter unit 90. In the embodiment, the rear surface of the front support portion 92C contacts the front surface of the protrusion 96F.

[0165] The washer 93 supports the front support portion 92C from the front side. The front surface of the front support portion 92C and the rear surface of the washer 93 are in contact with each other. The ring spring 94 supports the washer 93 from the front side. The ring spring 94 is disposed in a groove portion 62A provided on the outer peripheral surface of the second cylindrical portion 62. The ring spring 94 is fixed to the second cylindrical portion 62 of the hammer case 6 by being disposed in the groove portion 62A. The ring spring 94 presses the washer 93 against the front support portion 92C. The washer 93 and the ring spring 94 are fixed to at least a part of the hammer case 6 and function as a fastener that supports the front support portion 92C from the front side.

[0166] The front support portion 92C is pushed rearward by the ring spring 94 via the washer 93. As the front support portion 92C is pushed rearward, the light emitting body unit 90 and the rear support portion 92B are also pushed rearward. The light emitting body unit 90 and the radial elastic body 92 are sandwiched in the front-rear direction between the front wall portion 63 and the washer 93. As a result, the light emitting body unit 90 and the radial elastic body 92 are fixed to the hammer case 6.

[0167] The axial elastic body 91 supports the light emitting body unit 90 from the rear side. The axial elastic body 91 is disposed radially outward from the radial elastic body 92. The axial elastic body 91 has an axial base portion 91A that is disposed between the front wall portion 63 and the light emitting body unit 90 in the axial direction. The axial base portion 91A is annular.

[0168] The axial base portion 91A has a rear surface facing the front wall portion 63, a ring-shaped convex portion 91C protruding rearward from the rear surface of the axial base portion 91A, and a second axial rib portion 91D protruding rearward from the rear surface of the axial base portion 91A. The ring-shaped convex portion 91C is provided on the outer edge of the rear surface of the axial base portion 91A. The second axial rib portion 91D is provided radially inward from the ring-shaped convex portion 91C. A plurality of second axial rib portions 91D are provided at intervals in the circumferential direction. The ring-shaped convex portion 91C and the second axial rib portion 91D contact the front surface of the front wall portion 63. The rear surface of the axial base portion 91A is separated from the front surface of the front wall portion 63. The front surface of the axial base portion 91A contacts the rear surface of the light emitting body unit 90. In the embodiment, the front surface of the axial base portion 91A contacts the rear surface of the first outer tube portion 96A of the optical member 96.

[0169] The axial base portion 91A of the axial elastic body 91 is sandwiched in the front-rear direction between the front surface of the front wall portion 63 and the rear surface of the first outer cylinder portion 96A of the optical member 96. The axial base portion 91A supports the light emitting body unit 90 from the rear side. The axial elastic body 91 is supported by the hammer case 6.

[0170] The axial elastic body 91 has a cover portion 91B that covers the light-emitting body unit 90 from the radial outside. The cover portion 91B is cylindrical. The cover portion 91B contacts the outer peripheral surface of the light-emitting body unit 90. The outer peripheral surface of the light-emitting body unit 90 includes the outer peripheral surface of the optical member 96. The cover portion 91B covers the outer peripheral surface of the optical member 96. The cover portion 91B tightens the light-emitting body unit 90 from the radial outside by the elastic force of the cover portion 91B. The light-emitting body unit 90 and the axial elastic body 91 are fixed together by the elastic force of the cover portion 91B.

[0171] As shown in FIG. 21, the dimension Db of the cover portion 91B in the radial direction is smaller than the dimension Db of the axial base portion 91A in the axial direction.

[0172] In this way, the axial elastic body 91 and the radial elastic body 92 supported by the hammer case 6 support the light emitting body unit 90 from the radial inside, the radial outside, the rear side, and the front side. The axial elastic body 91 and the radial elastic body 92 are arranged so as to surround the light emitting body unit. The axial elastic body 91 and the radial elastic body 92 prevent the light emitting body unit 90 and the hammer case 6 from contacting each other.

[0173] As shown in Figure 9, in a cross section passing through the output rotation axis AX of the anvil 16 and parallel to the output rotation axis AX, each of the axial elastic body 91, the radial elastic body 92, and the light-emitting body unit 90 is positioned radially inward of a line VL connecting the front end of the first cylindrical portion 61 and the front end of the anvil 16.

[0174] [Shock absorption mechanism] FIG. 22 is a cross-sectional view showing a part of the impact tool 1 according to the embodiment, and corresponds to a view of an enlarged part of FIG. 9. FIG. 23 is a cross-sectional view showing a part of the impact tool 1 according to the embodiment, and corresponds to a cross-sectional view taken along the line CC in FIG. 3. FIG. 24 is an exploded perspective view showing the impact tool 1 according to the embodiment from the right front side. FIG. 25 is an exploded perspective view showing the impact tool 1 according to the embodiment from the left rear side. FIG. 26 is a perspective view showing the battery housing 3 according to the embodiment from the right front side. FIG. 27 is a perspective view showing the battery housing 3 according to the embodiment from the left rear side. FIG. 28 is an exploded perspective view showing the battery housing 3 according to the embodiment from the right front side. FIG. 29 is an exploded perspective view showing the battery housing 3 according to the embodiment from the left rear side. FIG. 30 is an exploded perspective view showing the battery housing 3 according to the embodiment from the right front side.

[0175] The impact tool 1 comprises a main housing 2 that accommodates a motor 10, vibration-proof rubber 100 (first elastic member) supported by the main housing 2, a battery housing 3 supported by the vibration-proof rubber 100, a battery holder 9 to which a battery pack 43 is attached, and a spring 45 and cushion rubber 46 supported by the battery housing 3.

[0176] The battery housing 3 has a holder support portion 31 that supports the battery holder 9, and an elastic member support portion 32 that is disposed in front of the battery pack 43 attached to the battery holder 9.

[0177] The battery housing 3 includes a left battery housing 3L and a right battery housing 3R. The holder support portion 31 is separated into the left battery housing 3L and the right battery housing 3R. The battery holder 9 is sandwiched between the holder support portion 31 of the left battery housing 3L and the holder support portion 31 of the right battery housing 3R.

[0178] The battery holder 9 holds the terminal 44. The terminal 44 has a terminal plate 44A and a terminal terminal 44B fixed to the terminal plate 44A. The terminal terminal 44B protrudes downward from the lower surface of the terminal plate 44A. A battery terminal of the battery pack 43 and the terminal terminal 44B of the terminal 44 are connected. The battery holder 9 holds the terminal plate 44A. An opening 37 is provided in the upper part of the holder support part 31. At least a part of the terminal 44 is disposed inside the opening 37. When the terminal 44 and the controller 11 are connected via a lead wire, the lead wire can pass through the opening 37.

[0179] The battery holder 9 is movably supported by the battery housing 3. In the embodiment, the battery holder 9 is supported by the battery housing 3 so as to be movably in the front-rear direction. The battery holder 9 is movable relative to the battery housing 3 in the front-rear direction.

[0180] The battery holder 9 has a terminal holding portion 901 , a protrusion 902 , and a slide portion 903 .

[0181] The terminal holding portion 901 holds the terminal plate 44A. In the embodiment, the battery holder 9 includes a left battery holder 9L and a right battery holder 9R. The right battery holder 9R is disposed on the right side of the left battery holder 9L. The left battery holder 9L and the right battery holder 9R form a pair of half-split holders. The terminal 44 is sandwiched between the left battery holder 9L and the right battery holder 9R.

[0182] The protrusion 902 protrudes forward from the front end of the terminal holding portion 901. The spring 45 is a coil spring. The protrusion 902 is inserted into the inside of the spring 45.

[0183] The battery housing 3 has a guide portion 35 that guides a slide portion 903 provided on the battery holder 9. The slide portion 903 is guided in the front-rear direction by the guide portion 35 of the battery housing 3. In the embodiment, the guide portion 35 includes a guide groove provided on the inner surface of the battery housing 3. The slide portion 903 is movable in the front-rear direction inside the guide groove.

[0184] The slide portions 903 are provided on the left and right portions of the terminal holding portion 901. The guide portions 35 are provided on the left and right portions of the terminal holding portion 901 in the holder support portion 31. As described above, the battery housing 3 includes the left battery housing 3L and the right battery housing 3R. The guide portions 35 are provided on each of the left battery housing 3L and the right battery housing 3R.

[0185] The spring 45 and the cushion rubber 46 are each supported by the elastic member support portion 32 of the battery housing 3. The elastic member support portion 32 has a spring holding portion 33 that holds the spring 45 and a rubber holding portion 34 that holds the cushion rubber 46.

[0186] The spring holding portion 33 includes a recess provided in the elastic member support portion 32. The recess is provided so as to recess forward from the rear surface of the elastic member support portion 32. The front portion of the spring 45 is disposed inside the recess, whereby the spring 45 is held by the spring holding portion 33. The protrusion 902 of the battery holder 9 is inserted into the inside of the spring 45 from its rear end portion. The rear end portion of the spring 45 is supported by the front surface of the terminal holding portion 901.

[0187] The cushion rubber 46 has a main body 46A and a protruding portion 46B protruding forward from the front surface of the main body 46A. Two protruding portions 46B are provided at an interval in the up-down direction. The rubber holding portion 34 includes an opening provided in the elastic member support portion 32. The cushion rubber 46 is held by the rubber holding portion 34 by arranging the protruding portion 46B in the opening. A part of the rubber holding portion 34 (opening) is provided in the left battery housing 3L, and a part of the rubber holding portion 34 (opening) is provided in the right battery housing 3R. With the protruding portion 46B arranged between the rubber holding portion 34 (opening) in the left battery housing 3L and the rubber holding portion 34 (opening) in the right battery housing 3R, the left battery housing 3L and the right battery housing 3R are fixed by the screw 3S, so that the protruding portion 46B is held by the rubber holding portion 34.

[0188] The spring 45 and the cushion rubber 46 each function as a second elastic member that suppresses relative movement between the battery housing 3 and the battery pack 43 attached to the battery holder 9. The spring 45 is a compression spring. The spring 45 biases the battery holder 9 in a direction away from the cushion rubber 46.

[0189] The battery pack 43 is attached to the battery holder 9 by sliding from the rear side of the battery holder 9 to the front side relative to the battery holder 9. The cushion rubber 46 is disposed on the front side of the battery pack 43. The spring 45 urges the battery holder 9 rearward. At least a part of the battery holder 9 urged rearward comes into contact with the rear part of the holder support part 31 of the battery housing 3, thereby positioning the battery holder 9 in the front-rear direction.

[0190] When no external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the battery holder 9 is placed in the initial position by the biasing force of the spring 45. The initial position of the battery holder 9 is a position where at least a part of the battery holder 9 biased backward is in contact with the rear part of the holder support part 31 of the battery housing 3. When the battery holder 9 is placed in the initial position, the cushion rubber 46 and the battery pack 43 attached to the battery holder 9 are separated. When an external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the cushion rubber 46 and the battery pack 43 attached to the battery holder 9 come into contact with each other. That is, when no external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the spring 45 suppresses the relative movement between the battery housing 3 and the battery pack 43. When an external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the cushion rubber 46 suppresses the relative movement between the battery housing 3 and the battery pack 43.

[0191] The vibration-proof rubber 100 suppresses the transmission of vibrations of the main body housing 2 to the battery housing 3. The vibration-proof rubber 100 functions as a vibration-proof member that attenuates vibrations input from the main body housing 2 to the battery housing 3. The vibration-proof rubber 100 is disposed between the main body housing 2 and the battery housing 3. The vibration-proof rubber 100 prevents contact between the main body housing 2 and the battery housing 3. The battery housing 3 is disposed between the main body housing 2 and the battery holder 9. The battery holder 9 is supported by the main body housing 2 via the vibration-proof rubber 100 and the battery housing 3.

[0192] The vibration-proof rubber 100 is disposed on each of the left and right sides of the battery housing 3. The vibration-proof rubber 100 includes a left vibration-proof rubber 100L disposed between the left main body housing 2L and the left battery housing 3L, and a right vibration-proof rubber 100R disposed between the right main body housing 2R and the right battery housing 3R.

[0193] The vibration-proof rubber 100 is rod-shaped and extends in three different directions. The vibration-proof rubber 100 has a first portion 101, a second portion 102, a third portion 103, a fourth portion 104, and a fifth portion 105. The first portion 101 and the third portion 103 each extend in the front-rear direction. The third portion 103 is disposed forward of the first portion 101. In the left-right direction, the position of the first portion 101 and the position of the third portion 103 are different. In the left vibration-proof rubber 100L, the third portion 103 is disposed to the left of the first portion 101. In the right vibration-proof rubber 100R, the third portion 103 is disposed to the right of the first portion 101. The second portion 102 extends in the left-right direction. The second portion 102 is disposed so as to connect the front end of the first portion 101 and the rear end of the third portion 103. The fourth portion 104 extends in the up-down direction. The fourth portion 104 extends downward from the front end of the third portion 103. The fifth portion 105 extends in the left-right direction. The fifth portion 105 is connected to the lower end of the fourth portion 104. In the left vibration-proof rubber 100L, the fifth portion 105 extends to the right side from the lower end of the fourth portion 104. In the right vibration-proof rubber 100R, the fifth portion 105 extends to the left side from the lower end of the fourth portion 104.

[0194] The vibration-proof rubber 100 has a plurality of protrusions 106 facing the battery housing 3, and a holding groove 107 facing the main housing 2. The protrusions 106 are provided on each of the first portion 101, the second portion 102, the third portion 103, the fourth portion 104, and the fifth portion 105. The holding groove 107 is formed across the first portion 101, the second portion 102, the third portion 103, the fourth portion 104, and the fifth portion 105.

[0195] The battery housing 3 has a holding recess 36 in which the vibration-proof rubber 100 is disposed. The holding recess 36 is formed to match the shape of the vibration-proof rubber 100 so that the first portion 101, the second portion 102, the third portion 103, the fourth portion 104, and the fifth portion 105 are disposed therein.

[0196] The retaining recesses 36 are provided on the left surface of the left battery housing 3L and the right surface of the right battery housing 3R. The left vibration-proof rubber 100L is placed in the retaining recess 36 provided in the left battery housing 3L. The right vibration-proof rubber 100R is placed in the retaining recess 36 provided in the right battery housing 3R. The protrusions 106 contact the inner surface of the retaining recesses 36. The protrusions 106 reduce the contact area between the vibration-proof rubber 100 and the battery housing 3.

[0197] The main housing 2 has a retaining protrusion 28 that is inserted into the retaining groove 107 of the vibration-proof rubber 100. The retaining protrusion 28 is formed to match the shape of the vibration-proof rubber 100 so that it can be inserted into the retaining groove 107 of the first portion 101, the second portion 102, the third portion 103, the fourth portion 104, and the fifth portion 105.

[0198] The retaining protrusions 28 are provided on the inner surface of the left main body housing 2L and the inner surface of the right main body housing 2R. In the left main body housing 2L, the retaining protrusions 28 are provided so as to protrude to the right from the inner surface (right surface) of the left main body housing 2L. In the right main body housing 2R, the retaining protrusions 28 are provided so as to protrude to the left from the inner surface (left surface) of the right main body housing 2R. The retaining protrusions 28 of the left main body housing 2L are inserted into the retaining grooves 107 of the left vibration-proof rubber 100L. The retaining protrusions 28 of the right main body housing 2R are inserted into the retaining grooves 107 of the right vibration-proof rubber 100R.

[0199] In the embodiment, the first portion 101, the second portion 102, the third portion 103, the fourth portion 104, and the fifth portion 105, which extend in different directions from one another, are integral with each other. Note that the first portion 101, the second portion 102, the third portion 103, the fourth portion 104, and the fifth portion 105 may be separate bodies.

[0200] [Impact tool operation] Next, the operation of the impact tool 1 will be described. For example, when performing a fastening operation of a work object, a socket used for the fastening operation is attached to the front end of the anvil 16. After the socket is attached to the anvil 16, the operator holds the side handle 7 with the left hand, holds the grip portion 23 with the right hand, and operates the trigger lever 17A with the index finger and middle finger of the right hand so that the trigger lever 17A moves backward. When the trigger lever 17A is operated so as to move backward, power is supplied from the battery pack 43 to the motor 10, the motor 10 is driven, and the light assembly 18 is turned on. The rotor 48 and the rotor shaft 49 are rotated by the driving of the motor 10. 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 revolves around the sun gear 55S while rotating, in a state where it meshes with the internal teeth of the internal gear 55I. The planetary gear 55P is rotatably supported by the spindle 14 via a pin 55A. Due to the revolution of the planetary gear 55P, the spindle 14 rotates at a rotational speed lower than the rotational speed of the rotor shaft 49.

[0201] When the spindle 14 rotates while the hammer protrusion 71B and the anvil protrusion 16C are in contact with each other, the anvil 16 rotates together with the hammer 71 and the spindle 14. As the anvil 16 rotates, the fastening operation progresses.

[0202] When a load equal to or greater than a predetermined value acts on the anvil 16 as the fastening operation progresses, the rotation of the anvil 16 and the hammer 71 stops. When the spindle 14 rotates while the rotation of the hammer 71 is stopped, the hammer 71 moves rearward. As the hammer 71 moves rearward, the contact between the hammer protrusion 71B and the anvil protrusion 16C is released. The hammer 71 that has moved rearward moves forward while rotating due to the elastic force of the first coil spring 73 and the second coil spring 74. As the hammer 71 moves forward while rotating, the anvil 16 is struck in the rotational direction by the hammer 71. As a result, the anvil 16 rotates about the output rotation shaft AX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0203] According to the embodiment, the axial elastic body 91 and the radial elastic body 92 suppress the vibration of the hammer case 6 from being transmitted to the light emitting body unit 90. Since the light emitting body unit 90 is vibration-proof, for example, damage to the connection portion by soldering between the substrate 95A and the LED chip 95B and damage to the wiring provided on the substrate 95A are suppressed. In other words, failure of the light emitting body unit 90 is suppressed.

[0204] Furthermore, according to the embodiment, the vibration-proof rubber 100 suppresses the transmission of vibrations of the main body housing 2 to the terminal 44 and the battery pack 43. Since the vibration-proof rubber 100 extends in three directions, the front-rear direction, the up-down direction, and the left-right direction, it can attenuate vibrations applied to the terminal 44 and the battery pack 43 in each of the three directions.

[0205] Furthermore, when the impact tool 1 falls and the battery pack 43 hits the floor or the ground, the battery holder 9 moves forward, causing the battery pack 43 to come into contact with the cushion rubber 46. This reduces the impact acting on the battery pack 43.

[0206] [effect] As described above, in the embodiment, the impact tool 1 comprises a motor 10, a main housing 2 that accommodates the motor 10, vibration-damping rubber 100 which is a first elastic member supported by the main housing 2, a battery housing 3 supported by the vibration-damping rubber 100, a battery holder 9 to which a battery pack 43 is attached and which is movably supported by the battery housing 3, and cushion rubber 46 which is a second elastic member that suppresses relative movement between the battery housing 3 and the battery pack 43 attached to the battery holder 9.

[0207] In the above configuration, by providing both the anti-vibration rubber 100 and the cushion rubber 46, the hardness of the anti-vibration rubber 100 and the hardness of the cushion rubber 46 can be set separately. For example, by setting the hardness of the anti-vibration rubber 100 low, it is possible to ensure a vibration reduction function, and by setting the hardness of the cushion rubber 46 higher than the hardness of the anti-vibration rubber 100, it is possible to ensure the required shock absorbing performance. The anti-vibration rubber 100 prevents the battery pack 43 from vibrating, and the cushion rubber 46 reduces the impact acting on the battery pack 43 when, for example, the impact tool 1 is dropped.

[0208] In the embodiment, the cushion rubber 46 is supported by the battery housing 3 and is capable of contacting the battery pack 43 .

[0209] In the above configuration, for example, when the impact tool 1 is dropped, the shock acting on the battery pack 43 is absorbed by the cushion rubber 46.

[0210] In the embodiment, the second elastic member includes a spring 45 that is supported by the battery housing 3 and biases the battery holder 9 in a direction away from the cushion rubber 46.

[0211] In the above configuration, for example, when the impact tool 1 is dropped, the shock acting on the battery pack 43 is absorbed by the cushion rubber 46, and then the battery pack 43 can return to its initial position by the biasing force of the spring 45.

[0212] In an embodiment, when no external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the battery holder 9 is positioned in its initial position by the biasing force of the spring 45, and when the battery holder 9 is positioned in its initial position, the cushion rubber 46 and the battery pack 43 attached to the battery holder 9 are separated, and when an external force is applied to the battery holder 9 in a direction approaching the cushion rubber 46, the cushion rubber 46 and the battery pack 43 attached to the battery holder 9 come into contact.

[0213] In the above configuration, when no external force is applied to the battery holder 9, the spring 45 suppresses the relative movement between the battery housing 3 and the battery pack 43, and when an external force is applied to the battery holder 9, the cushion rubber 46 suppresses the relative movement between the battery housing 3 and the battery pack 43.

[0214] In the embodiment, the battery pack 43 is attached to the battery holder 9 by sliding forward relative to the battery holder 9, and the cushion rubber 46 is disposed on the front side of the battery pack 43.

[0215] In the above configuration, when an external force is applied to the battery holder 9 and the battery pack 43 moves forward, the impact acting on the battery pack 43 is absorbed by the cushion rubber 46.

[0216] In the embodiment, the battery housing 3 has a guide portion 35 that guides a slide portion 903 provided on the battery holder 9.

[0217] In the above configuration, the battery holder 9 can move smoothly relative to the battery housing 3.

[0218] In the embodiment, the battery housing 3 includes a left battery housing 3L and a right battery housing 3R, and the guide portion 35 is provided in each of the left battery housing 3L and the right battery housing 3R.

[0219] In the above configuration, the battery holder 9 can move smoothly relative to the battery housing 3.

[0220] In the embodiment, the battery holder 9 holds a terminal 44 having a terminal 44 B that is connected to a battery terminal of the battery pack 43 .

[0221] In the above-described configuration, the shock acting on the terminal 44 is absorbed by the cushion rubber 46.

[0222] In the embodiment, the battery holder 9 includes a left battery holder 9L and a right battery holder 9R, and the terminal 44 is sandwiched between the left battery holder 9L and the right battery holder 9R.

[0223] In the above configuration, the terminal 44 is held by the battery holder 9 .

[0224] In this embodiment, the vibration-proof rubber 100 is rod-shaped and extends in three different directions.

[0225] In the above configuration, vibrations acting on the battery pack 43 in three directions (front-rear, up-down, and left-right) are damped.

[0226] In the embodiment, the vibration-proof rubber 100 is disposed between the main body housing 2 and the battery housing 3 .

[0227] In the above configuration, the vibration of the main body housing 2 is prevented from being transmitted to the battery housing 3.

[0228] In this embodiment, the vibration-proof rubber 100 has a retaining groove 107 , and the main housing 2 has a retaining protrusion 28 that is inserted into the retaining groove 107 .

[0229] In the above configuration, the vibration-proof rubber 100 is held by the main housing 2 .

[0230] In the embodiment, the battery housing 3 has a retaining recess 36 in which the vibration-proof rubber 100 is disposed.

[0231] In the above configuration, the vibration-proof rubber 100 is held in the battery housing 3.

[0232] In the embodiment, the main body housing 2 includes a left main body housing 2L and a right main body housing 2R, and the vibration-proof rubber 100 is disposed between the left main body housing 2L and the battery housing 3, and between the right main body housing 2R and the battery housing 3, respectively.

[0233] In the above configuration, the vibration of the main body housing 2 is effectively prevented from being transmitted to the battery housing 3.

[0234] In an embodiment, the impact tool 1 includes a motor 10, an impact mechanism 15 arranged on the front side of the motor 10, an anvil 16 that is struck in the rotational direction by the impact mechanism 15, a D-shaped handle arranged on the rear side of the motor 10, a battery holder 9 to which a battery pack 43 is attached, a battery housing 3 connected to the D-shaped handle and supporting the battery holder 9, and a cushion rubber 46 supported by the battery housing 3 and capable of contacting the battery pack 43.

[0235] In the above configuration, in a large impact tool 1 having a D-shaped handle, the cushion rubber 46 reduces the impact acting on the battery pack 43 when, for example, the impact tool 1 is dropped.

[0236] In this embodiment, the battery holder 9 is supported by the battery housing 3 so as to be movable in the front-rear direction.

[0237] In the above configuration, in a large impact tool 1 having a D-shaped handle, for example, if the impact tool 1 is dropped and an impact is applied to the battery pack 43, the battery holder 9 moves, thereby mitigating the impact acting on the battery pack 43.

[0238] In the embodiment, the impact tool 1 includes a spring 45 supported by the battery housing 3 and biasing the battery holder 9 in a direction away from the cushion rubber 46 .

[0239] In the above configuration, for example, when a large impact tool 1 is dropped, the impact acting on the battery pack 43 is absorbed by the cushion rubber 46, and then the battery pack 43 can return to its initial position by the biasing force of the spring 45.

[0240] In an embodiment, the impact tool 1 comprises a motor 10, a main housing 2 that accommodates the motor 10, and a battery holder 9 that is supported by the main housing 2 via vibration-damping rubber 100 consisting of a rod-shaped first part 101 to a fifth part 105 extending in three different directions, and to which a battery pack 43 is attached.

[0241] In the above configuration, vibrations acting on the battery pack 43 in three directions (front-rear, up-down, and left-right) are damped.

[0242] In this embodiment, the first portion 101 to the fifth portion 105, which are rod-shaped elastic members extending in three different directions, are integral with each other.

[0243] With the above-described configuration, the deterioration of workability when assembling the impact tool 1 is suppressed.

[0244] In the embodiment, the impact tool 1 includes a battery housing 3 disposed between the main body housing 2 and the battery holder 9. The vibration-proof rubber 100 is disposed between the main body housing 2 and the battery housing 3. The battery holder 9 is supported by the main body housing 2 via the vibration-proof rubber 100 and the battery housing 3.

[0245] In the above configuration, vibrations acting on the battery pack 43 in three directions (front-rear, up-down, and left-right) are effectively damped.

[0246] [Other embodiments] In the above-described embodiment, each of the axial elastic body 91 and the radial elastic body 92 is annular. The axial elastic body 91 may be provided separately at a plurality of positions around the second cylindrical portion 62. The radial elastic body 92 may be provided separately at a plurality of positions around the second cylindrical portion 62.

[0247] In the above embodiment, the battery holder 9 includes the left battery holder 9L and the right battery holder 9R disposed to the right of the left battery holder 9L. That is, the battery holder 9 can be separated into left and right parts. The battery holder 9 can also be separated into upper and lower parts.

[0248] In the above-described embodiment, the impact tool 1 is an impact wrench. The impact tool may be an impact driver. The anvil of the impact driver has an insertion hole into which a tool bit is inserted and a chuck mechanism that holds the tool bit.

[0249] In the above embodiment, the motor 10 is an inner rotor type brushless motor. The motor 10 may be an outer rotor type or a brushed motor. [Explanation of symbols]

[0250]

[0046] 1...impact tool, 2...main body housing, 2B...screw boss, 2L...left main body housing, 2R...right main body housing, 2S...screw, 3...battery housing, 3L...left battery housing, 3R...right battery housing, 3S...screw, 4...motor case, 4A...cylinder portion, 4B...lower wall portion, 4C...ventilation hole, 5...gear case, 5B...screw boss, 6...hammer case, 6A...bearing support surface, 6B...screw boss, 7...side handle, 7A...handle portion, 7B...base portion, 7C...first base portion, 7D...second base portion part, 7E... hinge, 8... bumper, 9... battery holder, 9L... left battery holder, 9R... right battery holder, 10... motor, 11... controller, 11A... controller case, 12... fan, 13... reduction mechanism, 14... spindle, 14A... flange part, 14B... spindle shaft part, 14C... protrusion part, 14D... spindle groove, 15... impact mechanism, 16... anvil, 16A... anvil recess, 16B... anvil shaft part, 16C... anvil protrusion part, 16D... first groove part, 16E... second groove part, 17...trigger switch, 17A...trigger lever, 17B...switch body, 18...light assembly, 19...interface panel, 20...hook assembly, 20A...base portion, 20B...ring portion, 21...main body portion, 22...projection portion, 23...grip portion, 23A...rear grip portion, 23B...upper grip portion, 24...controller housing portion, 25...panel holding portion, 26...air intake port, 27...air exhaust port, 28...holding protrusion, 31...holder support portion, 32...elastic member support portion, 33...spring holding portion, 34...rubber holding portion, 35...guide portion, 36...holding recess, 37...opening, 40...belt ring cover, 40S...screw, 41...screw, 42...tightening mechanism, 42A...screw, 42B...dial, 43...battery pack, 44...terminal, 44A...terminal plate, 44B...terminal terminal, 45...spring, 46...cushion rubber, 46A...main body, 46B...projection, 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, 55S...sun gear, 55P...planetary gear, 55I...internal anvil bearing, 56...gear bearing, 57...gear bearing, 58...spindle bearing, 61...first cylindrical portion, 62...second cylindrical portion, 62A...groove portion, 63...front wall portion, 71...hammer, 71A...hammer body, 71B...hammer protrusion portion, 71C...recess, 71D...hammer groove, 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, 79A...groove portion, 80...O-ring, 81...sealing member, 90...light-emitting unit, 91...axial elastic body, 91A...axial base portion, 91B...cover portion, 91C...ring-shaped convex portion, 91D...second axial rib portion, 92...radial elastic body, 92A...radial base portion, 92B...rear support portion, 92C...front support portion, 92D...radial rib portion, 92E...ring-shaped convex portion, 92F...first axial rib portion, 93...washer, 94...ring spring, 95...chip-on-board light-emitting diode, 95A...substrate, 95B...LED chip, 95C...bank, 95D...phosphor, 95E...lead wire, 95F...recess, 96...optical member, 96A...first outer cylinder portion, 96B...second outer cylinder portion, 96C...first inner cylinder portion, 96D...second inner cylinder portion,96E...light-transmitting portion, 96F...convex portion, 96G...snap fit, 100...anti-vibration rubber, 100L...left anti-vibration rubber, 100R...right anti-vibration rubber, 101...first portion, 102...second portion, 103...third portion, 104...fourth portion, 105...fifth portion, 106...projection portion, 107...retaining groove, 901...terminal retaining portion, 902...convex portion, 903...slide portion, AX...output rotating shaft, MX...motor rotating shaft, VL...line. ,

Claims

1. A motor; a main body housing that accommodates the motor; a first elastic member supported by the main body housing; a battery housing supported by the first elastic member; a battery holder to which a battery pack is attached and which is movably supported by the battery housing; a second elastic member that suppresses relative movement between the battery housing and the battery pack attached to the battery holder, Power tools.

2. the second elastic member is supported by the battery housing and includes a cushion rubber that is capable of contacting the battery pack; The power tool according to claim 1 .

3. the second elastic member includes a spring supported by the battery housing and biasing the battery holder in a direction away from the cushion rubber; The power tool according to claim 2.

4. When no external force is applied to the battery holder in a direction approaching the cushion rubber, the battery holder is placed in an initial position by the biasing force of the spring; When the battery holder is disposed at the initial position, the cushion rubber and the battery pack attached to the battery holder are spaced apart from each other, When an external force is applied to the battery holder in a direction approaching the cushion rubber, the cushion rubber comes into contact with the battery pack attached to the battery holder. The power tool according to claim 3.

5. the battery pack is attached to the battery holder by sliding forward relative to the battery holder; The cushion rubber is disposed on the front side of the battery pack. The power tool according to claim 2.

6. The battery housing has a guide portion that guides a slide portion provided on the battery holder. The power tool according to claim 1 .

7. the battery housing includes a left battery housing and a right battery housing; The guide portion is provided on each of the left battery housing and the right battery housing. The power tool according to claim 6.

8. the battery holder holds a terminal having a terminal terminal to be connected to a battery terminal of the battery pack; The power tool according to claim 1 .

9. the battery holder includes a left battery holder and a right battery holder; The terminal is sandwiched between the left battery holder and the right battery holder. The power tool according to claim 8.

10. The first elastic member is a rod-like member extending in three different directions. The power tool according to claim 1 .

11. The first elastic member is disposed between the main body housing and the battery housing. The power tool according to claim 1 .

12. the first elastic member has a holding groove; The main body housing has a holding protrusion that is inserted into the holding groove. The power tool according to claim 1 .

13. The battery housing has a holding recess in which the first elastic member is disposed. The power tool according to claim 1 .

14. The body housing includes a left body housing and a right body housing, The first elastic member is disposed between the left main body housing and the battery housing, and between the right main body housing and the battery housing. The power tool according to claim 1 .

15. A motor; a striking mechanism disposed in front of the motor; an anvil that is struck in a rotational direction by the striking mechanism; a D-shaped handle disposed on the rear side of the motor; a battery holder to which the battery pack is attached; a battery housing connected to the D-shaped handle and supporting the battery holder; a cushion rubber supported by the battery housing and capable of contacting the battery pack; Power tools.

16. The battery holder is supported by the battery housing so as to be movable in the front-rear direction. The power tool of claim 15.

17. a spring supported by the battery housing and biasing the battery holder in a direction away from the cushion rubber; The power tool of claim 15.

18. A motor; a main body housing that accommodates the motor; a battery holder that is supported by the main body housing via rod-shaped elastic members that extend in three different directions, and to which a battery pack is attached; Power tools.

19. The rod-shaped elastic members extending in three different directions are integral with each other.

19. The power tool of claim 18.

20. a battery housing disposed between the main body housing and the battery holder; the elastic member is disposed between the main body housing and the battery housing, the battery holder is supported by the main body housing via the elastic member and the battery housing; 19. The power tool of claim 18.

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