Impact tool

Abstract

To provide an impact tool capable of providing a sufficient linear striking force by a tip tool while suppressing vibration of the impact tool.SOLUTION: The impact tool comprises: a motor having a motor shaft which rotates about a motor rotary shaft; a striking mechanism that has a striker adjacent to an air chamber defined in a cylinder and converts rotation motion of the motor shaft into linear motion of the striker along a striking axis defined in advance by using an air spring of the air chamber; and a housing that stores the motor and the striking mechanism. The motor rotary shaft is parallel to the striking axis and configured to pass through the inside of the cylinder.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a striking tool.

Background Art

[0002] For example, Patent Document 1 discloses a striking tool including a support shaft that rotates by the driving force of a motor, a rotating body that is rotated by the rotation of the support shaft, an impact member attached to the rotating body, and a shovel as a tip tool. In this striking tool, a crank mechanism rotated by the driving force of the motor is used to convert the rotational motion by the motor into a linear motion of the shovel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional technology, since the driving force of the motor is mechanically converted into the reciprocating movement of the tip tool, the vibration of the electric tool may increase, and the striking force by the tip tool may not be sufficiently obtained.

Means for Solving the Problems

[0005] According to a first aspect of the present disclosure, a striking tool is provided. The striking tool includes a motor having a motor shaft that rotates about a motor rotation axis, a striker adjacent to an air chamber defined inside a cylinder, and a striking mechanism that uses an air spring of the air chamber to convert the rotational motion of the motor shaft into a linear motion of the striker along a predetermined striking axis. The striking tool further includes a housing that houses the motor and the striking mechanism. The motor rotation axis is parallel to the striking axis and is configured to pass through the inside of the cylinder.

[0006] According to the impact tool of the above aspect, by using a pneumatic spring impact mechanism, compared with an impact mechanism that mechanically transmits kinetic energy, the vibration of the impact tool can be suppressed, and a large amount of kinetic energy can be transmitted to the tip tool. Further, by bringing the motor rotation shaft and the impact shaft close to each other and arranging the configuration from the motor to the tip tool substantially in a straight line, it is easy to apply a straight-line force to the tip tool, and an impact tool suitable for excavation work can be provided.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0008] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for carrying out preferred examples of the present invention, and is not intended to limit the scope of the present invention. Further, the additional features and inventions disclosed below can be used separately or together with other features and inventions in order to provide further improved devices, their manufacturing methods, and usage methods.

[0009] Also, the combinations of features and steps disclosed in the following detailed description are not essential for carrying out the present invention in the broadest sense, and are described only for the purpose of particularly explaining representative specific examples of the present invention. Further, the various features of the above and below representative specific examples, as well as the various features described in the independent and dependent claims, do not have to be combined as in the specific examples described herein or in the order listed, in providing additional and useful embodiments of the present invention.

[0010] All features described in this specification and / or in the claims are intended to be disclosed separately and independently of each other, as limitations to the initial disclosure and the claimed specific matters, apart from the configuration of the features described in the embodiments and / or in the claims. Further, all descriptions regarding numerical ranges and groups or populations are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the claimed specific matters.

[0011] In one or more embodiments, further, a main handle may be provided, including a grip portion configured to be gripped by a user, a first connection portion connecting one end of the grip portion to the housing, and a second connection portion connecting the other end of the grip portion to the housing. The striking shaft may be configured to pass between one end of the grip portion and the other end of the grip portion when viewing the striking tool along a direction orthogonal to the striking shaft. According to the striking tool of this form, it becomes easier for the user to perform an operation of pushing out the striking tool along the striking shaft by operating the main handle. Therefore, a striking tool suitable for excavation work can be provided.

[0012] In one or more embodiments, the striking mechanism may further include a second bevel gear meshing with a first bevel gear provided on the motor shaft, and a crankshaft provided integrally with the second bevel gear and rotating together with the second bevel gear. According to the impact tool of this form, the driving force of the motor can be efficiently transmitted.

[0013] In one or more embodiments, the extending direction of the gripping portion may be parallel to a plane orthogonal to the rotation axis of the second bevel gear and in a direction intersecting the impact axis. According to the impact tool of this form, an impact tool with good weight balance can be provided while gripping the main handle.

[0014] In one or more embodiments, a controller for controlling the motor may be provided. The main handle may be connected to the rear end of the housing. The controller may be housed in the housing and disposed between the motor and the main handle. According to the impact tool of this form, the controller can be efficiently arranged in the housing.

[0015] In one or more embodiments, the housing may further be provided with a battery mounting portion for detachably mounting a battery for supplying power to the motor. The impact shaft may be configured to pass through at least a part of the battery mounting portion. According to the impact tool of this form, by arranging the battery on the impact shaft, the enlargement of the housing in a direction intersecting the impact shaft can be suppressed or prevented.

[0016] In one or more embodiments, the battery mounting portion may be disposed between the first connection portion and the second connection portion of the housing. According to the impact tool of this form, the battery can be surrounded by the main handle, and the periphery of the battery can be protected using the main handle.

[0017] In one or more embodiments, the housing may include an internal housing that houses the motor and the striking mechanism, and an external housing to which the main handle is connected and that houses the internal housing. An elastic body that abuts against the internal housing and the external housing may be disposed between the internal housing and the external housing. According to the impact tool of this form, it is possible to suppress or prevent vibration from being transmitted from the internal housing, which is a vibration source, to the external housing when the impact tool is driven.

[0018] In one or more embodiments, further, a front handle configured to be gripped by a user may be provided. When the extending direction of the striking shaft is defined as the front-rear direction, the main handle may be connected to a rear side of the housing with respect to the rotation axis of the second bevel gear. The front handle may be connected to a front side of the housing with respect to the rotation axis of the second bevel gear. According to the impact tool of this form, it becomes easier for the user to transmit the force for pressing the tip tool against the work piece to the impact tool by using the main handle and the front handle. Therefore, it is possible to provide an impact tool suitable for excavation work.

[0019] In one or more embodiments, further, a light emitting unit capable of irradiating light toward the work area may be provided. According to the impact tool of this form, by providing the light emitting unit, the visibility of the work area by the impact tool can be improved.

[0020] A. First Embodiment: Hereinafter, with reference to the drawings, the impact tool 100 according to the first embodiment will be described. In this embodiment, as an example of the impact tool 100, an electric shovel will be used for the description. The electric shovel is a hand-held electric tool used for excavation work including excavation and crushing of earth and sand, gravel, coal, snow, etc. The electric shovel is configured to be able to execute an operation of linearly reciprocating a shovel as a tip tool TT attached to the tip of the housing 60 along the impact axis TX (hereinafter, also referred to as "hammer operation") by utilizing the driving force of a motor. The uses of the shovel are, for example, for civil engineering, farming, or household use. The shovel may also be called a "shovel" or a "scoop". Note that the impact tool 100 can be appropriately adapted to work other than excavation work by replacing the tip tool TT.

[0021] In this specification, for convenience of explanation, the extending direction of the impact axis TX is defined as the "front-rear direction of the impact tool 100". In the front-rear direction, the front end portion 61 side of the housing 60 where the tool holder 90 (see FIG. 3) is arranged is defined as the "front side of the impact tool 100", and the opposite side is defined as the "rear side of the impact tool 100". Also, a direction parallel to the rotation axis CX (see FIG. 3) of the crankshaft 564 described later is defined as the "vertical direction of the impact tool 100". In the vertical direction, the direction from the crankshaft 564 toward the impact axis TX is defined as the upward direction, and the opposite direction is defined as the downward direction. Also, a direction orthogonal to the front-rear direction and the vertical direction is defined as the left-right direction.

[0022] The impact tool 100 includes a housing 60, a motor 20 (see FIG. 3) and an impact mechanism 50 (see FIG. 3) housed in the housing 60. As shown in FIG. 1, the housing 60 has a substantially cylindrical shape and is a long hollow housing extending along the impact axis TX. The housing 60 includes a front end portion 61 located on the front side of the housing 60, an impact mechanism housing portion 62, a motor housing portion 63, and a rear end portion 64 opposite to the front end portion 61.

[0023] A main handle 70 is connected to the rear end portion 64 of the housing 60, and a front handle 80 is connected to the striking mechanism accommodating portion 62. The main handle 70 has a substantially U-shaped configuration. The main handle 70 includes a gripping portion 76 configured to be gripped by a user, a first extension portion 71, a second extension portion 72, a first connection portion 70L, and a second connection portion 70R. Both ends of the main handle 70 are fixed to the housing 60 via the first connection portion 70L and the second connection portion 70R. That is, the main handle 70 and the housing 60 are annular in top view.

[0024] The gripping portion 76 is a portion of the main handle 70 configured to be gripped by a user. The gripping portion 76 has a substantially cylindrical shape. The extending direction of the gripping portion 76 can be defined, for example, by the axial direction of the central axis HX of the gripping portion 76. As shown in FIGS. 3 and 5, the extending direction of the gripping portion 76 is, for example, parallel to the plane OS among the planes orthogonal to the rotation axis CX of the second bevel gear 562 and is in a direction orthogonal to the striking axis TX. In the present embodiment, the extending direction of the gripping portion 76 coincides with the left-right direction. By configuring in this way, the gripping position of the main handle 70 and the center of gravity positions of the second bevel gear 562 and the crankshaft 564 can be arranged in a positional relationship that provides good weight balance in the left-right direction of the striking tool 100. Note that the extending direction of the gripping portion 76 does not necessarily have to be orthogonal to the striking axis TX as long as it is parallel to the plane OS, for example, and may be a direction intersecting the striking axis TX at a predetermined angle. The intersection of the central axis HX of the gripping portion 76 and the outer surface on the left side of the gripping portion 76 is also referred to as "one end 76L of the gripping portion 76", and the intersection of the central axis HX and the outer surface on the right side of the gripping portion 76 is also referred to as "the other end 76R of the gripping portion 76". The first extension portion 71 is a portion of the main handle 70 that connects the first connection portion 70L and one end 76L of the gripping portion 76. The second extension portion 72 is a portion of the main handle 70 that connects the second connection portion 70R and the other end 76R of the gripping portion 76.

[0025] As shown in FIG. 3, the gripping portion 76 of the main handle 70 is disposed at a position rearward of the rotation axis CX of the second bevel gear 562 and rearward of the housing 60. Further, when viewing the impact tool 100 along the direction orthogonal to the impact axis TX, that is, in a plan view along the vertical direction shown in FIG. 5, the impact axis TX passes through the range between one end 76L and the other end 76R of the gripping portion 76. In the present embodiment, the impact axis TX is configured to pass through the gripping portion 76. In the example of FIG. 3, the impact axis TX is configured to intersect the central axis HX of the gripping portion 76. By arranging the extending direction of the main handle 70 along the impact axis TX, it becomes easier for the user to perform an operation of pressing the rear end of the main handle 70 and pushing out the tip tool TT along the impact axis TX. Further, by arranging the gripping portion 76 on the impact axis TX, it becomes easier for the user to press the rear end of the main handle 70 and push out the tip tool TT more easily along the impact axis TX. Therefore, an impact tool 100 suitable for excavation work can be provided. The impact axis TX may not be orthogonal to the extending direction of the gripping portion 76, for example, and may intersect the extending direction of the gripping portion 76 at a predetermined angle within the range between one end 76L and the other end 76R of the gripping portion 76. The gripping portion 76 may be offset and disposed above or below the impact axis TX, or may be offset and disposed above or below the surface OS.

[0026] Also, among the planes orthogonal to the rotation axis CX of the second bevel gear 562, the plane OS is configured to pass through the gripping portion 76, the first connection portion 70L, and the second connection portion 70R. In other words, the main handle 70 is configured to extend rearward from the housing 60 along the plane OS. In the example of FIG. 1, the first extension portion 71 extends rearward along the first connection portion 70L, and the second extension portion 72 extends rearward along the second connection portion 70R. According to the impact tool 100 configured in this way, the user can easily apply a force along the plane direction of the plane OS using the main handle 70, and an impact tool 100 suitable for excavation work can be provided. In the present embodiment, the plane OS is configured to pass through the central axis HX of the gripping portion 76 among the gripping portions 76.

[0027] As shown in FIG. 1, the front handle 80 has a substantially U-shaped configuration. The front handle 80 includes a gripping portion 86 configured to be gripped by the user, and connection portions 80L, 80R. The gripping portion 86 has a substantially cylindrical shape extending in the left-right direction and is disposed above the housing 60. Both ends of the front handle 80 are connected to the housing 60 via the connection portions 80L, 80R. In the present embodiment, the connection portions 80L, 80R support the front handle 80 so that the position of the front handle 80 around the support axis FX with respect to the housing 60 can be adjusted. Note that the front handle 80 is not limited to only a form in which the position can be adjusted, and may be fixed to the housing 60. For example, the front handle 80 may be attached in a state where the vertical direction is reversed from the state of FIG. 1. In this case, the gripping portion 86 is disposed below the housing 60. Also, for example, the front handle 80 may be configured to be detachable from the housing 60. In this case, the front handle 80 may be configured to be arbitrarily switched to any position between the upper side of the housing 60 and the lower side of the housing 60 according to the user's preference.

[0028] The connection parts 80L and 80R are connected to a position on the housing 60 that is slightly forward of the center of the housing 60 in the front-rear direction. Specifically, as shown in FIG. 4, the front handle 80 is connected to a position on the housing 60 that is forward of the rotation axis CX of the second bevel gear 562. Thereby, it becomes easier for the user to transmit the force for pressing the tip tool TT against the workpiece to the impact tool 100 by using the front handle 80. Therefore, an impact tool 100 suitable for excavation work can be provided.

[0029] In the present embodiment, the support shaft FX of the front handle 80 is configured to be orthogonal to the impact shaft TX. When the user pushes the housing 60 forward using the front handle 80, a force is transmitted to the housing 60 via the support shaft FX by operating the front handle 80. Therefore, according to the impact tool 100 of the present embodiment, it becomes easy for the user to push the housing 60 forward along the impact shaft TX. Therefore, an impact tool 100 suitable for excavation work can be provided.

[0030] As shown in FIG. 1, a switch trigger 77 is provided on the grip portion 76 of the main handle 70. The switch trigger 77 is a so-called momentary type switch. For example, when the user presses the switch trigger 77 while gripping the grip portion 76, the motor 20 is driven and the impact tool 100 is switched to the on state.

[0031] The switch trigger 77 is provided at a position facing the rear end portion 64 of the housing 60 in the gripping portion 76. When using the impact tool 100, the user holds the gripping portion 76 of the main handle 70 with one hand, for example, and uses the impact tool 100 while holding the gripping portion 86 of the front handle 80 with the other hand. The user performs a digging operation on the workpiece by pressing the tip tool TT against the workpiece such as the ground and pushing the impact tool 100 forward using the main handle 70. The user can execute the hammer operation at any timing in the digging operation by switching the on / off state of the switch trigger 77 during the operation of the main handle 70. Also, the user can suitably perform the operation of lifting the impact tool 100 by using the front handle 80. Therefore, an impact tool 100 suitable for the digging operation can be provided.

[0032] The housing 60 is provided with a light emitting portion LT. The light emitting portion LT is, for example, an LED illumination powered by the battery BAT. The light emitting portion LT is configured to be able to irradiate light toward the working area including the tip tool TT, the workpiece, or the surroundings thereof. By providing the light emitting portion LT, the visibility of the working area by the impact tool 100 can be improved. In the present embodiment, the light emitting portion LT is disposed at a position surrounded by the front handle 80. Therefore, the light emitting portion LT can be protected from impacts and the like by using the front handle 80.

[0033] A battery BAT for supplying power to the motor 20 is disposed at the rear end portion 64 of the housing 60. In the present disclosure, the battery BAT is a rechargeable battery having a well-known configuration.

[0034] FIG. 2 shows the impact tool 100 with the battery BAT removed. As shown in FIG. 2, a battery mounting portion 30 for mounting the battery BAT is provided at the rear end portion 64 of the housing 60. Note that, in FIG. 2, for ease of understanding of the technology, the position of the battery BAT in a state of being mounted on the battery mounting portion 30 is illustrated using a broken line.

[0035] The battery mounting portion 30 has a guide rail 32 and a terminal 34. The battery mounting portion 30 may further include a locking mechanism for restricting the detachment of the battery BAT. The guide rail 32 is formed in a convex shape along the vertical direction. The guide rail 32 fits into a concave rail receiving portion (not shown) of the battery BAT. The guide rail 32 defines the attachment / detachment direction DB when the battery BAT is attached / detached as shown in FIG. 1. The battery BAT attached to the battery mounting portion 30 is electrically connected via the terminal 34, enabling power supply to the motor 20 and the like.

[0036] When the central axis of the gripping portion 76 is defined as the "central axis HX", the attachment / detachment direction DB of the battery BAT is set in a direction intersecting the central axis HX on the premise that the battery BAT does not interfere with the main handle 70. In the example of FIG. 2, the attachment / detachment direction DB is perpendicular to the striking axis TX. That is, the attachment / detachment direction DB coincides with the vertical direction and is a direction perpendicular to the central axis HX. The user can remove the battery BAT from the battery mounting portion 30 by pulling it upward along the attachment / detachment direction DB. Also, the user can attach the battery BAT to the battery mounting portion 30 by pushing it downward along the attachment / detachment direction DB. Since it can be attached / detached in a direction intersecting the central axis HX of the gripping portion 76, the user can easily attach / detach the battery BAT with the other hand even while gripping the main handle 70 or the front handle 80 with one hand. The attachment / detachment direction DB of the battery BAT may be defined in a direction obliquely intersecting the striking axis TX on the premise that the battery BAT does not interfere with the main handle 70. Note that the battery BAT may be removed by being pulled downward along the attachment / detachment direction DB, or may be attached by being pushed upward.

[0037] As shown in FIG. 2, the battery mounting portion 30 is disposed at the rear end portion 64 of the housing 60 at a position between both ends of the main handle 70. In the example of FIG. 2, the battery mounting portion 30 is disposed between the first connection portion 70L and the second connection portion 70R. By configuring the mounted battery BAT to be surrounded by the main handle 70, the periphery of the battery BAT can be protected using the main handle 70. For example, the battery BAT can be protected from impacts such as when the striking tool 100 drops.

[0038] As shown in FIG. 3, the battery mounting portion 30 is configured such that the striking shaft TX passes through the battery mounting portion 30. In other words, the battery mounting portion 30 is disposed on the back surface of the housing 60. By disposing the battery BAT on the striking shaft TX, enlargement of the housing 60 in the radial direction intersecting the striking shaft TX can be suppressed or prevented.

[0039] With reference to FIGS. 3 to 5, the internal configuration of the housing 60 will be described. As shown in FIG. 3, in the present embodiment, the housing 60 includes an internal housing 602 and an external housing 604. The external housing 604 houses the internal housing 602 and forms the outer contour of the housing 60. The main handle 70 is connected to the external housing 604. The internal housing 602 houses the motor 20, the controller 40, the striking mechanism 50, and the tool holder 90. The front handle 80 is connected to the internal housing 602. The tool holder 90 detachably holds the tip tool TT in an insertion hole 92 provided at the front end portion 61 of the housing 60.

[0040] The motor 20 is driven by the electric power supplied from the battery BAT mounted on the battery mounting portion 30. The motor 20 is a brushless DC motor that is driven under the control of the controller 40. As shown in FIG. 3, the motor 20 is housed in the motor housing portion 63 behind the striking mechanism housing portion 62 in the housing 60, and the striking shaft TX is configured to pass through the motor 20. By arranging the motor rotation shaft MX of the motor 20 and the striking shaft TX relatively close to each other, the radial size of the striking tool 100 can be reduced.

[0041] As shown in FIG. 4, the motor 20 includes a motor body 22 including a stator and a rotor, a motor shaft 24, and a fan 26. The motor body 22 is disposed in the inner housing 602 in the motor housing portion 63. The motor shaft 24 rotates about the motor rotation shaft MX together with the rotor. The front end of the motor shaft 24 projects into the striking mechanism housing portion 62. A first bevel gear 561 is provided at the front end of the motor shaft 24. The fan 26 rotates together with the motor shaft 24 and generates an air flow for cooling the motor body 22.

[0042] As shown in FIG. 3, the controller 40 is configured by a computer including a CPU as a processor and memories such as a RAM and a ROM. The controller 40 is configured to control various operations in the impact tool 100, such as driving control of the motor 20. The controller 40 is disposed between the motor 20 and the main handle 70 in the housing 60. The controller 40 has a substantially flat plate shape and is disposed in the housing 60 such that its plane direction intersects the motor rotation axis MX. By housing the controller 40 on the rear side of the housing 60 where it is easy to form a space, the controller 40 can be efficiently disposed in the housing 60. Further, in the present embodiment, the controller 40 is disposed at the rear end portion 64 behind the motor housing portion 63 in the housing 60, and is disposed between the motor 20 and the battery mounting portion 30. Further, the impact axis TX is configured to pass through the controller 40. By configuring in this way, the size in the radial direction of the housing 60 can be reduced.

[0043] As shown in FIG. 4, the impact mechanism 50 includes an impact portion 52 and a crank portion 56. The crank portion 56 converts the rotational motion of the motor shaft 24 into a linear motion of the striker 524 along the impact axis TX, and transmits the kinetic energy of the rotational motion of the motor shaft 24 to the striker 524. The impact portion 52 transmits the kinetic energy of the striker 524 transmitted from the crank portion 56 to the tip tool TT.

[0044] The crank portion 56 includes a first bevel gear 561, a second bevel gear 562, a crankshaft 564, a rod 568, and a piston 569. The first bevel gear 561 is provided at the front end of the motor shaft 24. The first bevel gear 561 is meshed with the second bevel gear 562 in the impact mechanism housing portion 62. The crankshaft 564 includes a main body portion 564B, a crank plate 564T, and a peripheral portion 564W. The peripheral portion 564W is a portion of the crankshaft 564 that is continuous with the crank plate 564T around the rotation axis CX.

[0045] The second bevel gear 562 is provided on the outer periphery of the crankshaft 564. The second bevel gear 562 is integrally formed with the crankshaft 564. In the present embodiment, the inner peripheral surface 562W of the second bevel gear 562, which is separate from the crankshaft 564, is engaged with the peripheral edge portion 564W of the crankshaft 564 by press-fitting or the like, thereby forming a single component having the functions of the crankshaft 564 and the second bevel gear 562. The driving force of the motor 20 can be efficiently transmitted by the crankshaft 564 and the second bevel gear 562. The crankshaft 564 is rotatably supported with respect to the inner housing 602 by a plurality of bearings 565, and rotates around the rotation axis CX together with the second bevel gear 562. Therefore, the rotation axis CX of the crankshaft 564 and the rotation axis of the second bevel gear 562 coincide with each other. The rotation axis CX is orthogonal to the motor rotation axis MX and the striking axis TX. A space 564S for arranging the bearing 565 is defined below the crank plate 564T and between the peripheral edge portion 564W and the main body portion 564B. By arranging the bearing 565 in this space 564S, the crankshaft 564, the bearing 565, and the second bevel gear 562 can be arranged in parallel along the radial direction of the crankshaft 564. Therefore, the axial size of the rotation axis CX in the arrangement region of the crankshaft 564, the bearing 565, and the second bevel gear 562 can be reduced. Note that the second bevel gear 562 and the crankshaft 564 may be integrally formed by molding or the like.

[0046] The rotation of the motor shaft 24 is transmitted to the second bevel gear 562 and the crankshaft 564 via the first bevel gear 561. The crankshaft 564 and the second bevel gear 562 receive the rotation of the first bevel gear 561 and rotate around the rotation axis CX orthogonal to the motor rotation axis MX.

[0047] The crankshaft 564 transmits the kinetic energy transmitted from the motor 20 to the striking part 52. A crank pin 566 is provided on the crank plate 564T of the crankshaft 564. A rod 568 that connects the crank pin 566 and the piston 569 is attached to the crank pin 566.

[0048] The crank pin 566 is offset from the rotation axis CX. When the crankshaft 564 rotates, the crank pin 566 rotates around the rotation axis CX. The rod 568 swings along the front-rear direction perpendicular to the rotation axis CX as the crankshaft 564 rotates. The rotational motion of the crankshaft 564 is transmitted to the piston 569 via the rod 568.

[0049] The piston 569 is a substantially cylindrical member. The piston 569 is disposed slidably along the striking axis TX inside a cylinder 520 formed in the inner housing 602. The piston 569 reciprocates in the front-rear direction via the rod 568 that swings due to the rotation of the crank pin 566.

[0050] The striking part 52 includes a striker 524 and an impact bolt 526. The striker 524 applies a striking force to the tip tool TT. The striker 524 is disposed slidably along the striking axis TX inside the cylinder 520. An air chamber SP that functions as an air spring is defined between the piston 569 and the striker 524 inside the cylinder 520. The impact bolt 526 is an intermediate member that transmits the kinetic energy of the striker 524 to the tip tool TT. The impact bolt 526 is disposed movably along the striking axis TX in front of the striker 524.

[0051] As the rod 568 swings and the piston 569 reciprocates back and forth in the front-rear direction, the internal pressure of the air chamber SP fluctuates, and the striker 524 slides back and forth in the cylinder 520 by the action of the air spring. More specifically, when the piston 569 moves forward, the distance between the piston 569 and the striker 524 decreases. As a result, the air in the air chamber SP is compressed, and the internal pressure in the cylinder 520 increases. The striker 524 is pushed forward at high speed by the action of the air spring and strikes the impact bolt 526.

[0052] The struck impact bolt 526 transmits the kinetic energy of the striker 524 to the tip tool TT. The tip tool TT, which has received the transmitted kinetic energy, is linearly driven along the impact axis TX. The impact tool 100 of the present embodiment can suppress the vibration of the impact tool 100 and transmit a large amount of kinetic energy to the tip tool TT as compared with the case of mechanically transmitting kinetic energy to the tip tool TT by utilizing the action of the air spring.

[0053] When the piston 569 moves backward, the distance between the piston 569 and the striker 524 increases, and the air in the air chamber SP expands. As a result, the internal pressure in the cylinder 520 decreases, and the striker 524 is drawn backward. The struck tip tool TT comes into contact with the workpiece to be machined and moves backward together with the impact bolt 526 due to the reaction force from the workpiece to be machined. Thereafter, similarly, the hammer operation by the striking mechanism 50 is repeated.

[0054] As shown in FIG. 4, in the impact tool 100 of the present embodiment, the motor rotation axis MX and the impact axis TX are configured to be close to each other. The motor rotation axis MX is configured to pass through the inside of the cylinder 520 from the viewpoint of bringing the motor rotation axis MX and the impact axis TX close to each other. In the example of FIG. 4, the motor rotation axis MX of the motor shaft 24 is disposed slightly below the impact axis TX and is configured to be parallel to the impact axis TX. By bringing the motor rotation axis MX and the impact axis TX close to each other and arranging the configuration from the motor 20 as the driving source of kinetic energy to the tip tool TT substantially in a straight line, the center of gravity of the entire impact tool 100 and the impact axis TX can be brought close to each other. Therefore, the operability of the impact tool 100 can be improved. Note that the motor rotation axis MX and the impact axis TX may be configured to coincide with each other. Further, while the motor rotation axis MX and the impact axis TX are close to each other, the motor rotation axis MX may be disposed above, to the left, or to the right of the impact axis TX. Even in such a configuration, the operability of the impact tool 100 can be improved by bringing the center of gravity of the entire impact tool 100 and the impact axis TX close to each other.

[0055] As shown in FIG. 5, in the present embodiment, an elastic body 606 is provided between the inner housing 602 and the outer housing 604. The elastic body 606 is, for example, a resin material such as urethane or silicone. The elastic body 606 has, for example, a substantially cubic shape. The elastic body 606 is held in a state of being in contact with the inner housing 602 and the outer housing 604. In the example of FIG. 5, the housing 60 includes four elastic bodies 606. Specifically, in the front-rear direction of the housing 60, they are arranged at two locations before and after sandwiching the rotation axis CX, and at each of the two locations before and after, they are arranged at two locations on the left and right sandwiching the impact axis TX.

[0056] By providing the elastic body 606 between the inner housing 602 and the outer housing 604, it is possible to suppress or prevent the transmission of vibration from the inner housing 602, which is the vibration source, to the outer housing 604 during the hammer operation. Also, it is possible to suppress or prevent the occurrence of play between the inner housing 602 and the outer housing 604 due to dimensional errors in the manufacture of the inner housing 602 or the outer housing 604, etc. Note that the number of the elastic bodies 606 may be arbitrarily set. The elastic body 606 may be singular or any number of 2 or more. The elastic body 606 is not limited to a resin material, and a metal material such as a metal spring may be used. The shape of the elastic body 606 is not limited to a cube and may be any shape such as a rectangular parallelepiped, a sphere, or a columnar body. The elastic body 606 may be, for example, an annular member continuously arranged around the inner housing 602 such as an O-ring.

[0057] B. Other Embodiments: (B1) In the above embodiment, a shovel was used as an example of the tip tool TT. In contrast, tools other than a shovel may be used for the tip tool TT. The tip tool TT may be, for example, a tool for performing a peeling operation on a processing target, such as a so-called spatula or a scraper. Since the peeling operation can perform an operation of pressing the impact tool 100 against the processing target in the same manner as the excavation operation, the impact tool 100 shown in the above embodiment is also suitable for the peeling operation. Note that the tip tool TT may be a tool for peeling rust or paint on the surface of the processing target by a plurality of needle-like members reciprocating back and forth and pressing against the processing target, such as a Needlegun Scaler, a Needlescaler, or a Needlegun. Note that the shovel may be standardized according to the Japanese Industrial Standards (JIS) or may be otherwise. The shovel may or may not have a footrest portion.

[0058] (B2) Further, in view of the gist of the present disclosure and each of the above embodiments, the following aspects are constructed. The following aspects can be adopted in combination with the impact tool 100 shown in each embodiment, the above-described modifications, or the disclosure described in each claim. [Aspect 1] The striking shaft is configured to pass through the motor. [Aspect 2] The front handle is supported so that its position with respect to the housing can be adjusted, and the support shaft of the front handle is orthogonal to the striking shaft. [Aspect 3] The striking shaft is configured to pass through the controller. [Aspect 4] The controller is disposed on the rear side of the motor in the housing. [Aspect 5] The controller is disposed between the motor and the battery mounting portion.

Description of Reference Numerals

[0059] 20... motor, 22... motor body, 24... motor shaft, 26... fan, 30... battery mounting portion, 32... guide rail, 34... terminal, 40... controller, 50... striking mechanism, 52... striking portion, 56... crank portion, 60... housing, 61... front end portion, 62... striking mechanism housing portion, 63... motor housing portion, 64... rear end portion, 70... main handle, 70L... first connection portion, 70R... second connection portion, 71... first extension portion, 72... second extension portion, 76... gripping portion, 77... switch trigger, 80... front handle, 80L, 80R... connection portions, 86... gripping portion, 90... tool holder, 92... insertion hole, 100... impact tool, 520... cylinder, 524... striker, 526... impact bolt, 561... first bevel gear, 562... second bevel gear, 562W... inner peripheral surface, 564... crankshaft, 564B... main body portion, 564T... crank plate, 564W... peripheral portion, 565... bearing, 566... crank pin, 568... rod, 569... piston, 602... inner housing, 604... outer housing, 606... elastic body, BAT... battery, LT... light emitting portion, SP... air chamber, TT... tip tool

Claims

1. A striking tool, comprising: a motor having a motor shaft that rotates about a motor rotation axis; a striker adjacent to an air chamber defined inside a cylinder, and a striking mechanism that converts the rotational movement of the motor shaft into a linear movement of the striker along a predetermined striking axis by utilizing an air spring of the air chamber; a housing that houses the motor and the striking mechanism; wherein the motor rotation axis is parallel to the striking axis and is configured to pass through the inside of the cylinder. A striking tool.

2. The striking tool according to claim 1, further comprising: a main handle including a gripping portion configured to be gripped by a user, a first connecting portion connecting one end of the gripping portion to the housing, and a second connecting portion connecting the other end of the gripping portion to the housing; wherein the striking axis is configured to pass between one end of the gripping portion and the other end of the gripping portion when the striking tool is viewed in a direction perpendicular to the striking axis. A striking tool.

3. The striking tool according to claim 2, wherein the striking mechanism further comprises: a first bevel gear provided on the motor shaft and meshed with a second bevel gear; a crankshaft provided integrally with the second bevel gear and rotating together with the second bevel gear. A striking tool.

4. The striking tool according to claim 3, wherein an extending direction of the gripping portion is parallel to a plane perpendicular to a rotation axis of the second bevel gear and intersects the striking axis. A striking tool.

5. The striking tool according to any one of claims 2 to 4, further comprising: a controller for controlling the motor; wherein the main handle is connected to a rear end portion of the housing; and the controller is housed in the housing and disposed between the motor and the gripping portion. A striking tool.

6. The striking tool according to any one of claims 1 to 5, wherein the housing further comprises a battery mounting portion for removably mounting a battery for supplying power to the motor, and the striking axis is configured to pass through the battery mounting portion. A striking tool.

7. The striking tool according to claim 6, which is directly or indirectly dependent on claim 2, wherein the battery mounting portion is disposed between the first connecting portion and the second connecting portion of the housing. A striking tool.

8. ​ ​ ​ ​ ​ The impact tool according to any one of claim 2 or claims 3 to 7 which are directly or indirectly dependent on claim 2, wherein the housing comprises an inner housing that houses the motor and the impact mechanism, and an outer housing to which the main handle is connected and that houses the inner housing, an elastic body that abuts against the inner housing and the outer housing is disposed between the inner housing and the outer housing. Impact tool.

9. The impact tool according to any one of claim 3 or claims 4 to 8 which are directly or indirectly dependent on claim 3, further comprising a front handle configured to be gripped by a user, when the extending direction of the impact axis is defined as the front-rear direction, the main handle is connected to the housing on the rear side of the rotation axis of the second bevel gear, the front handle is connected to the housing on the front side of the rotation axis of the second bevel gear. Impact tool.

10. The impact tool according to any one of claims 1 to 9, further comprising a light emitting unit capable of irradiating light toward a work area.

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