Motor unit and working machine

Abstract

To provide a technology capable of suppressing transmission of vibration of a housing to a battery.SOLUTION: The motor unit includes an output shaft coupled to the working unit, an electric motor that rotates the output shaft, a housing that accommodates the electric motor, a first battery attachment portion that is disposed on the housing and to which a first battery is detachably attached, a second battery attachment portion that is disposed on the working unit and to which a second battery is detachably attached, an adapter that is attached to the first battery attachment portion instead of the first battery, a cable that extends from the adapter and is connected to any one of the second battery attachment portion and the second battery, and a control circuit board that controls an output of the electric motor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a motor unit and a work machine. [Background technology]

[0002] Patent Document 1 discloses a motor unit that is detachably attached to each of a plurality of types of working units and operates the working units. The motor unit includes an output shaft connected to the working unit, an electric motor that rotates the output shaft, a housing that accommodates the electric motor, a battery attachment section that is disposed on the housing and to which a battery is detachably attached, and a control circuit board that controls the output of the electric motor. When the battery is attached to the battery attachment section, power is supplied from the battery to the electric motor via the battery attachment section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 049617 Summary of the Invention [Problem to be solved by the invention]

[0004] In the motor unit of Patent Document 1, when the battery is attached to the battery mounting portion, the battery is fixed to the housing that houses the electric motor. Therefore, when the electric motor operates and the housing vibrates, the vibration of the housing is transmitted to the battery. The vibration of the housing here includes, for example, vibration input to the housing from the working unit. This specification provides a technology that can suppress the transmission of the vibration of the housing to the battery. [Means for solving the problem]

[0005] The motor unit disclosed in this specification is detachably attached to each of a plurality of types of working units and operates the working units. The motor unit includes an output shaft connected to the working unit, an electric motor that rotates the output shaft, a housing that accommodates the electric motor, a first battery mounting section disposed on the housing and to which a first battery is detachably attached, a second battery mounting section disposed on the working unit and to which a second battery is detachably attached, an adapter that is attached to the first battery mounting section in place of the first battery, a cable extending from the adapter and connecting to either the second battery mounting section or the second battery, and a control circuit board that controls the output of the electric motor. When the first battery is attached to the first battery mounting section, power is supplied from the first battery to the electric motor via the first battery mounting section. When the adapter is attached to the first battery mounting section and the second battery is attached to the second battery mounting section, power is supplied from the second battery to the electric motor via the cable, the adapter, and the first battery mounting section.

[0006] According to the above configuration, the battery can be attached to the second battery attachment portion disposed on the working unit. By attaching the battery to the second battery attachment portion, transmission of vibrations from the housing to the battery can be suppressed compared to when the battery is attached to the housing.

[0007] Another motor unit disclosed in this specification is detachably attached to each of a plurality of types of working units and operates the working units. The motor unit includes an output shaft connected to the working unit, an electric motor that rotates the output shaft, a housing that accommodates the electric motor, a battery attachment portion that is disposed on the working unit and to which a battery is detachably attached, a cable that extends from the housing and connects to either the battery attachment portion or the battery, and a control circuit board that is disposed within the housing and controls the output of the electric motor. When the battery is attached to the battery attachment portion, power is supplied from the battery to the electric motor via the cable.

[0008] According to the above configuration, the battery can be attached to the battery attachment portion disposed on the working unit. By attaching the battery to the battery attachment portion, transmission of vibrations from the housing to the battery can be suppressed compared to when the battery is attached to the housing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a view of the working machine of the first embodiment as seen from above on the front left. [Figure 2] FIG. 2 is a view of the transom 4a of the first embodiment as seen from above and rear left. [Figure 3] 1 is a diagram showing a battery pack BP according to a first embodiment. [Figure 4] 1 is a diagram showing a state in which a battery pack BP of a first embodiment is attached to a power tool T and used. FIG. [Figure 5] 1 is a view of a motor unit 2 of a first embodiment as seen from above, rear, left. [Figure 6] 1 is a view of a motor unit 2 of a first embodiment as seen from the front right below. [Figure 7] 2 is a cross-sectional view of the inside of the motor unit 2 of the first embodiment, as seen from the left. FIG. [Figure 8]1 is a diagram showing the motor unit 2 of the first embodiment with an adapter 82 attached, viewed from above and rear left. FIG. [Figure 9] 10 is a view of the second battery mounting portion 90a of the first embodiment with the cover portion 96 open, as viewed from above and behind the transom 4a on the left. FIG. [Figure 10] 10 is a view of a main body 94 of a second battery mounting portion 90a of the first embodiment as viewed from above and behind the left of the rammer 4a. FIG. [Figure 11] FIG. 10 is a view of the working machine of the second embodiment as seen from above on the front left. [Figure 12] FIG. 10 is a diagram showing the configuration of a battery device BD of a second embodiment. [Figure 13] 10A and 10B are diagrams illustrating the configuration of a second battery mounting portion 204a of a second embodiment. [Figure 14] FIG. 2 is a block diagram showing the flow of power transmission in the work machines of the first and second embodiments. [Figure 15] FIG. 10 is a view of the working machine of the third embodiment as seen from above on the front left. [Figure 16] FIG. 10 is a view of the working machine of the fourth embodiment as seen from above on the front left. [Figure 17] FIG. 4 is a block diagram showing the flow of power transmission in the work machines of the third and fourth embodiments. [Figure 18] FIG. 10 is a view of the working machine of the fifth embodiment as seen from above on the front right. [Figure 19] FIG. 10 is a view of the working machine of the sixth embodiment as seen from above on the front right. [Figure 20] FIG. 10 is a block diagram showing the flow of power transmission in the work machines of the fifth and sixth embodiments. [Figure 21] FIG. 13 is a view of the working machine of the seventh embodiment as seen from above on the front right. [Figure 22] FIG. 13 is a view of the working machine of the eighth embodiment as seen from above on the front right. [Figure 23] FIG. 10 is a block diagram showing the flow of power transmission in the work machines of the seventh and eighth embodiments. [Figure 24] FIG. 13 is a view of the working machine of the ninth embodiment as seen from above on the front right. [Figure 25] FIG. 23 is a view of the working machine of the tenth embodiment as seen from above on the front right. [Figure 26] FIG. 12 is a block diagram showing the flow of power transmission in the work machines of the ninth and tenth embodiments. [Figure 27] FIG. 23 is a view of the working machine of the eleventh embodiment as seen from above on the front right. [Figure 28] FIG. 23 is a view of the working machine of the twelfth embodiment as seen from above on the front right. [Figure 29] FIG. 20 is a block diagram showing the flow of power transmission in the work machines of the eleventh and twelfth embodiments. [Figure 30] FIG. 23 is a view of the working machine of the thirteenth embodiment as seen from above on the left. [Figure 31] FIG. 23 is a view of the working machine of the fourteenth embodiment as seen from above on the left. [Figure 32] FIG. 22 is a block diagram showing the flow of power transmission in the work machines of the thirteenth and fourteenth embodiments. [Figure 33] FIG. 23 is a view of the working machine of the fifteenth embodiment as seen from above on the front right. [Figure 34] FIG. 22 is a view of the working machine of the sixteenth embodiment as seen from above on the front right. [Figure 35] FIG. 20 is a block diagram showing the flow of power transmission in the work machines of the fifteenth and sixteenth embodiments. [Figure 36] FIG. 22 is a view of the working machine of the seventeenth embodiment as seen from above on the front left. [Figure 37] FIG. 23 is a view of the working machine of the eighteenth embodiment as seen from above on the front left. [Figure 38] FIG. 22 is a block diagram showing the flow of power transmission in the work machines of the seventeenth and eighteenth embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0010] Representative and non-limiting examples of the present invention are described in detail below with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. Furthermore, the additional features and inventions disclosed can be used separately or together with other features and inventions to provide further improved motor units and working machines.

[0011] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential to practicing the invention in its broadest sense, but are described solely to specifically illustrate exemplary embodiments of the invention. Furthermore, the various features of the following exemplary embodiments and those described in the claims do not necessarily have to be combined in the exact embodiments described herein or in the exact order listed to provide additional and useful embodiments of the invention.

[0012] All features described in this specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the specific features described in the original disclosure and claims, apart from the configuration of features described in the examples and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the specific features described in the original disclosure and claims.

[0013] In one or more embodiments, the control circuit board may be disposed within the housing.

[0014] A fan for cooling the electric motor may be provided inside the housing. With the above configuration, the cooling air generated by the fan can cool both the electric motor and the control circuit board. This eliminates the need to mount a separate fan for cooling the control circuit board on the motor unit, thereby simplifying the configuration of the motor unit.

[0015] In one or more embodiments, the motor unit may further include a first surface parallel to the axial direction of the output shaft and a second surface perpendicular to the axial direction of the output shaft. The motor unit may be fixed to the working unit with at least one of the first surface and the second surface abutting against the working unit.

[0016] According to the above configuration, the motor unit can be attached to the working unit in a plurality of positions (for example, a position in which the first surface abuts against the working unit, a position in which the second surface abuts against the working unit), thereby increasing the variety of working units to which the motor unit can be attached.

[0017] In one or more embodiments, at least one of the first battery and the second battery may be detached from the motor unit and attached to an electrical device other than the motor unit, thereby enabling the battery to also supply power to the electrical device.

[0018] According to the above configuration, the battery can be shared between the motor unit and an electric device other than the motor unit.

[0019] In one or more embodiments, the second battery may include a battery pack. A plurality of the battery packs may be attached to the second battery mounting portion.

[0020] According to the above configuration, since multiple battery packs can be attached to the second battery mounting portion, the electric motor can be operated using power from the multiple battery packs. This allows the electric motor to have a higher output than when the electric motor is operated using power from, for example, a single battery pack. As a result, the motor unit can be applied to work units that require high output. In other words, the number of types of work units to which the motor unit can be applied can be increased.

[0021] In one or more embodiments, the second battery may include a battery pack, and the motor unit may further include a cover that covers the battery pack attached to the second battery mounting portion.

[0022] According to the above configuration, the battery pack attached to the second battery attachment portion can be protected from water and dust flying in from the outside.

[0023] In one or more embodiments, the working unit may include a handle including a grip that can be held by a user, and the second battery mounting portion may be disposed on the handle.

[0024] According to the above configuration, the second battery mounting portion is disposed on the handle. The handle may be configured to prevent the transmission of vibrations from the main body of the working unit so as not to cause discomfort to the user holding the grip. Therefore, by attaching the battery to the second battery mounting portion, it is possible to prevent the transmission of vibrations from the main body of the working unit to the battery. Furthermore, according to the above configuration, the second battery mounting portion is disposed in a position that is easily reachable by the user. Therefore, the user can easily attach and detach the battery to and from the second battery mounting portion.

[0025] In one or more embodiments, the second battery mounting portion may be disposed on the upper surface of the working unit when the working unit is in a working position.

[0026] According to the above configuration, the second battery attachment portion is disposed in a position that is easily reachable by the user, which allows the user to easily attach and detach the battery to and from the second battery attachment portion.

[0027] In one or more embodiments, the first battery mounting portion and the second battery mounting portion may each include a common member having a common shape.

[0028] According to the above configuration, the first battery mounting portion and the second battery mounting portion can share parts, thereby reducing the manufacturing cost of the motor unit.

[0029] In one or more embodiments, the length of the cable may be in the range of 100 mm to 2000 mm. For example, the length of the cable may be in the range of 1000 mm to 2000 mm, or in the range of 1300 mm to 2000 mm, or in the range of 1000 mm to 1500 mm, or in the range of 1300 mm to 1500 mm.

[0030] The cable extends between a first battery mounting portion disposed on the housing and a second battery mounting portion disposed on the working unit. If the cable length is excessively long compared to the distance between the first battery mounting portion and the second battery mounting portion, the cable may become excessively loose and interfere with work. Here, the distance between the first battery mounting portion and the second battery mounting portion varies depending on the type of working unit, but is expected to be generally within a range of 50 mm to 1500 mm. With the above configuration, the cable length can be set to a length slightly longer than the expected distance between the first battery mounting portion and the second battery mounting portion. This prevents the cable from becoming excessively loose, thereby preventing the cable from interfering with work.

[0031] In one or more embodiments, the adapter may be removably attached to the first battery mounting portion.

[0032] Once the adapter is non-detachably attached to the first battery mounting portion, it cannot be removed thereafter. However, there are cases where it is desired to remove the adapter from the first battery mounting portion even after the adapter has been attached to the first battery mounting portion. For example, there are cases where it is desired to attach the first battery to the first battery mounting portion in place of the adapter. According to the above configuration, the adapter is detachably attached to the first battery mounting portion. As a result, even after the adapter has been attached to the first battery mounting portion, the adapter can be removed from the first battery mounting portion. As a result, the first battery can be attached to the first battery mounting portion in place of the adapter.

[0033] In one or more embodiments, the working unit may function as a rammer to compact the ground. The working unit may include a handle including a grip that can be held by a user. The second battery mounting portion may be disposed on the handle.

[0034] According to the above configuration, the battery can be attached to the handle of the rammer, which can prevent vibrations from the housing from being transmitted to the battery. Also, it can prevent vibrations from the main body of the rammer from being transmitted to the battery.

[0035] In one or more embodiments, the operational unit may function as a plate compactor for compacting the ground. The operational unit may include a handle including a grip that can be held by a user. The second battery mounting portion may be disposed on the handle.

[0036] According to the above configuration, the battery can be attached to the handle of the plate compactor. This makes it possible to suppress the transmission of vibrations from the housing to the battery. Also, it makes it possible to suppress the transmission of vibrations from the main body of the plate compactor to the battery.

[0037] In one or more embodiments, the working unit may function as a trowel for leveling a concrete surface. The working unit may include a handle including a grip that can be held by a user. The second battery mount may be located on the handle.

[0038] According to the above configuration, the battery can be attached to the handle of the trowel, which can prevent vibrations from the housing from being transmitted to the battery. Also, it can prevent vibrations from the main body of the trowel from being transmitted to the battery.

[0039] In one or more embodiments, the operational unit may function as a concrete mixer for mixing concrete. The operational unit may include a handle including a grip that can be held by a user. The second battery mounting portion may be disposed on the handle.

[0040] According to the above configuration, the battery can be attached to the handle of the concrete mixer, which can suppress the transmission of vibrations from the housing to the battery, and can also suppress the transmission of vibrations from the main body of the concrete mixer to the battery.

[0041] In one or more embodiments, the working unit may function as a concrete saw for cutting into concrete. The working unit may include a handle including a grip that can be held by a user. The second battery mount may be located on the handle.

[0042] According to the above configuration, the battery can be attached to the handle of the concrete saw, which can prevent vibrations from the housing from being transmitted to the battery. Also, it can prevent vibrations from the main body of the concrete saw from being transmitted to the battery.

[0043] In one or more embodiments, the working unit may function as a sprayer that pressurizes and sprays liquid, and the second battery mounting portion may be disposed on an upper surface of the working unit when the working unit is in a working position.

[0044] According to the above-described configuration, the battery can be attached to the upper surface of the injector, thereby suppressing transmission of vibrations of the housing to the battery.

[0045] In one or more embodiments, the working unit may function as a lawnmower. The working unit may include a handle including a grip that can be held by a user. The second battery mounting portion may be located on the handle.

[0046] According to the above configuration, the battery can be mounted on the handle of the lawnmower, which can prevent vibrations from the housing from being transmitted to the battery. It can also prevent vibrations from the main body of the lawnmower from being transmitted to the battery.

[0047] In one or more embodiments, a work machine may include the motor unit, and a working unit to which the motor unit is detachably attached and which operates by receiving power from the motor unit.

[0048] According to the above configuration, it is possible to realize a work machine in which vibrations of the housing are less likely to be transmitted to the battery.

[0049] (First Example) The work machine shown in FIG. 1 comprises a motor unit 2 and a working unit 4 (a rammer 4a in this embodiment). The motor unit 2 is detachably attached to the working unit 4. The motor unit 2 is a prime mover that rotates an output shaft 52 (see FIG. 6) using power supplied from a battery pack BP (see FIG. 3) or the like. The working unit 4 is a mechanical element that converts the rotational motion of the output shaft 52 into a predetermined motion (e.g., reciprocating motion) to perform work (e.g., ground compaction work). An engine unit (not shown) can also be attached to the working unit 4 instead of the motor unit 2. The engine unit referred to here is an engine unit that is compatible with the motor unit 2, such as the engine unit of the GX120 sold by Honda R&D Co., Ltd.

[0050] (Configuration of Ramma 4a) As shown in FIG. 2, the rammer 4a includes a working unit 6 that performs ground compaction work, an upper housing 8 that supports the upper part of the working unit 6, and a handle 10 disposed on the upper part of the upper housing 8. The upper housing 8 includes a mounting base 12 for mounting the motor unit 2 (see FIG. 1) and an opening 14 for receiving the output shaft 52 (see FIG. 6) of the motor unit 2. The working unit 6 includes an extension / contraction unit 16 that extends and contracts vertically, and a ground leveling plate 18 fixed to the lower end of the extension / contraction unit 16. Although not shown, the upper housing 8 houses a crank mechanism that converts the rotational motion of the output shaft 52 into a reciprocating motion. The extension / contraction unit 16 extends and contracts vertically in conjunction with the reciprocating motion of the crank mechanism. The rammer 4a repeatedly presses the ground leveling plate 18 against the ground by extending and contracting the extension / contraction unit 16 vertically with the ground leveling plate 18 facing the ground. In this manner, the rammer 4a performs ground compaction work. In this embodiment, the front-to-back, up-down, left-to-right directions of the rammer 4a are defined according to the vertical up-down direction when the rammer 4a is in the working position. Specifically, the vertical up-down direction when the leveling board 18 is placed on a horizontal surface is defined as the up-down direction of the rammer 4a. Also, the direction perpendicular to the up-down direction, in which the mounting base 12 faces, is defined as the rear direction, and the opposite direction is defined as the front direction. Also, the direction perpendicular to the front-to-back and up-down directions is defined as the left-to-right direction.

[0051] The handle 10 includes a first grip 20, a second grip 22, and a third grip 24. The first grip 20 extends rearward from the upper end of the upper housing 8, then bends to extend to the right, and then bends to extend forward. The second grip 22 extends upward from the upper end of the upper housing 8, then bends to extend to the right, and then bends to extend downward. The third grip 24 extends downward and forward from the upper end of the upper housing 8, then bends to extend to the right, and then bends to extend upward and rearward. The first grip 20, the second grip 22, and the third grip 24 are integrally formed. At least one of the first grip 20, the second grip 22, and the third grip 24 is held by the user during work.

[0052] (Battery pack BP configuration) As shown in FIG. 3 , the battery pack BP includes a battery housing 30 that houses multiple rechargeable secondary battery cells (e.g., lithium-ion battery cells) and a hook 34 movably held in the battery housing 30. The hook 34 includes an engagement portion 38 and an operating portion 40. The engagement portion 38 normally protrudes outside the battery housing 30. When the operating portion 40 is pressed into the battery housing 30, the entire engagement portion 38 moves into the battery housing 30. The battery housing 30 also includes a slit 32 and a guide rail 36. The slit 32 connects the inside and outside of the battery housing 30. The slit 32 is formed to align with the position of a battery terminal (not shown) housed inside the battery housing 30. Charging and discharging of the multiple secondary battery cells occur via the battery terminal. The battery pack BP is detachably attached to battery attachment portions 54, 90a (see FIGS. 5 and 10) described below, and supplies power to the motor unit 2 (see FIG. 1).

[0053] As shown in FIG. 4, the battery pack BP can be detached from the motor unit 2 and attached to the power tool T to supply power to the power tool T. The power tool T is a rebar tying machine that ties together a plurality of rebars R using a wire W. The battery pack BP can also be used with power tools T other than rebar tying machines (e.g., impact drivers, circular saws, driver drills). The battery pack BP can also be used with gardening products (e.g., brush cutters, blowers, hedge trimmers, chainsaws, transport vehicles, snow blowers, and tillers).

[0054] (Configuration of motor unit 2) As shown in FIGS. 5 and 6, the motor unit 2 includes a housing 50 having a substantially rectangular parallelepiped shape. As shown in FIG. 5, a first battery mounting portion 54 is provided on the upper surface of the housing 50, to which the battery pack BP (see FIG. 3) can be attached / detached. As shown in FIG. 6, an output shaft 52 protrudes from the front surface of the housing 50. In this embodiment, the front, rear, up, down, left, and right directions are defined relative to the housing 50 of the motor unit 2, separate from the front, rear, up, down, left, and right directions of the transom 4a described above. Specifically, the direction in which the output shaft 52 extends is defined as the front-rear direction. The direction in which the output shaft 52 protrudes from the housing 50 is defined as the forward direction, and the opposite direction is defined as the rearward direction. Furthermore, the direction perpendicular to the front-rear direction and in which the first battery mounting portion 54 faces is defined as the upward direction, and the opposite direction is defined as the downward direction. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction. In FIGS. 5, 6, 7, and 8, which focus on the housing 50, the front, rear, up, down, left, and right directions relative to the housing 50 are shown. 1, 2, 9, 10, and 11, which focus on the transom 4a, show the front, rear, up, down, left, and right directions of the transom 4a.

[0055] As shown in FIG. 7 , the motor unit 2 further includes an electric motor 70, a fan 72, and a control circuit board 74. The housing 50 accommodates the electric motor 70, the fan 72, and the control circuit board 74. When the motor unit 2 is attached to the rammer 4a (i.e., the state shown in FIG. 1 ), the front portion of the output shaft 52 enters the interior of the upper housing 8 through the opening 14 (see FIG. 2 ) and is connected to a crank mechanism (not shown) that extends and retracts the extension / retraction section 16. The electric motor 70 includes a rotor 78 fixed to the output shaft 52, a stator 80 disposed radially inside the rotor 78, and a bracket 81 fixed to the front portion of the stator 80. The electric motor 70 is a so-called outer rotor type electric motor. The stator 80 and the bracket 81 support the output shaft 52 rotatably about the shaft rotation axis A via a bearing 76. The electric motor 70 rotates the output shaft 52 about the shaft rotation axis A. The control circuit board 74 is disposed at a position offset rearward from the rear end of the output shaft 52. The control circuit board 74 is disposed so that its thickness direction is the front-rear direction. The control circuit board 74 is electrically connected to the connection terminal 46 (see FIG. 5 ) of the first battery mounting portion 54. The control circuit board 74 adjusts the power supplied to the connection terminal 46 and supplies it to the electric motor 70. In this way, the control circuit board 74 controls the output of the electric motor 70. The fan 72 is fixed to the output shaft 52 rearward of the rotor 78. As the output shaft 52 rotates, the fan 72 generates cooling air for cooling the electric motor 70 and the control circuit board 74. Specifically, the cooling air here refers to a flow of air that flows from the outside to the inside of the housing 50, passes through the electric motor 70 and the control circuit board 74, and then flows out from the inside of the housing 50 to the outside. The cooling air dissipates heat generated by the electric motor 70 and the control circuit board 74 to the outside of the housing 50.

[0056] As shown in FIG. 6, a front mounting portion 56 for mounting to the mounting base 12 (see FIG. 2) is provided on the front surface of the bracket 81. The front mounting portion 56 includes a front abutment surface 58 that abuts against the rear surface of the mounting base 12, and a plurality of screw holes 60. The front abutment surface 58 is a surface perpendicular to the axial direction of the output shaft 52. As shown in FIG. 2, the mounting base 12 is formed with a plurality of through holes 62 whose positions correspond to the plurality of screw holes 60. The motor unit 2 is mounted to the rammer 4a by inserting screws into the plurality of through holes 62 and threading them into the plurality of screw holes 60, with the front abutment surface 58 abutting against the rear surface of the mounting base 12. Also as shown in FIG. 6, a lower mounting portion 64 for mounting to a mounting base other than the mounting base 12 (for example, a mounting base 328 (see FIG. 18) described in the fifth embodiment) is provided on the lower surface of the stator 80. The lower mounting portion 64 includes a lower abutment surface 66 that abuts against the upper surface of the mounting base, and a plurality of screw holes 68. The lower abutment surface 66 is a surface that is parallel to the axial direction of the output shaft 52.

[0057] As shown in Figure 5, the first battery mounting portion 54 has a guide groove 42 that receives the guide rail 36 (see Figure 3) of the battery pack BP in a slidable manner along the front-to-rear direction, an engagement groove 44 that engages with the engagement portion 38 (see Figure 3) of the hook 34 of the battery pack BP, and a connection terminal 46 that corresponds to the battery terminal (not shown) of the battery pack BP.

[0058] When attaching the battery pack BP to the first battery mounting portion 54, the battery pack BP is slid forward relative to the first battery mounting portion 54. As a result, the guide rails 36 (see FIG. 3) enter the guide grooves 42, and the engagement portions 38 (see FIG. 3) engage with the engagement grooves 44, completing the attachment of the battery pack BP. With the battery pack BP attached to the first battery mounting portion 54, the connection terminals 46 enter the interior of the battery housing 30 (see FIG. 3) through the slits 32 (see FIG. 3) and engage with the corresponding battery terminals. This electrically connects the battery terminals to the connection terminals 46. When removing the battery pack BP from the first battery mounting portion 54, the operating portion 40 is pushed in to release the engagement between the engagement portions 38 and the engagement grooves 44, and then the battery pack BP is slid backward relative to the first battery mounting portion 54. As a result, the guide rails 36 come out of the guide grooves 42, completing the removal of the battery pack BP.

[0059] The first battery mounting portion 54 has guide grooves 42, engagement grooves 44, and connection terminals 46 in two locations. Therefore, two battery packs BP can be mounted on the first battery mounting portion 54.

[0060] As shown in FIG. 8, the motor unit 2 further includes an adapter 82. The adapter 82 is attached to the first battery mounting portion 54 instead of the battery pack BP (see FIG. 3). Like the battery pack BP, the adapter 82 includes guide rails (not shown) that fit into the guide grooves 42 (see FIGS. 5 and 10), hooks 84 that engage with the engagement grooves 44 (see FIGS. 5 and 10), and adapter terminals (not shown) that correspond to the connection terminals 46 (see FIGS. 5 and 10). Thus, like the battery pack BP, the adapter 82 is detachably attached to the first battery mounting portion 54. The adapter 82 differs from the battery pack BP in that it does not include a secondary battery. The adapter 82 is connected to one end of a cable 88 via a joint 86. The joint 86 is rotatable relative to the adapter 82 about a rotation axis that extends in the left-right direction. The cable 88 is electrically connected to the connection terminal 46 of the first battery mounting portion 54 via the adapter terminal. The other end of the cable 88 is connected to the second battery mounting portion 90a shown in Fig. 9. The length of the cable 88 is, for example, in the range of 100 mm to 2000 mm, preferably in the range of 400 mm to 500 mm, and is 450 mm in this embodiment.

[0061] As shown in FIG. 9 , the second battery mounting portion 90a includes a base portion 92 attached to the handle 10 of the rammer 4a, a main body portion 94 to which the battery pack BP is attached, and a cover portion 96 that covers the battery pack BP attached to the main body portion 94. The cover portion 96 includes a front cover 98 that covers the front portion of the battery pack BP attached to the main body portion 94, and a rear cover 100 that covers the rear portion of the battery pack BP attached to the main body portion 94. The front cover 98 is fixed to the main body portion 94. The rear cover 100 is rotatable about a rotation axis extending in the left-right direction relative to the front cover 98. A latch 104 that engages with a latch receiver 102 formed on the main body portion 94 is provided on the outer surface of the rear cover 100. As shown in FIG. 1 , when the latch 104 is engaged with the latch receiver 102, the entire battery pack BP attached to the main body portion 94 is covered by the front cover 98 and the rear cover 100. The state of the cover portion 96 shown in FIG. 1 is also referred to as a closed state. By closing the cover 96, the battery pack BP can be protected from water and dust flying in from the outside. On the other hand, as shown in FIG. 9, when the latch 104 and the latch receiver 102 are disengaged and the rear cover 100 is moved upward, the rear of the battery pack BP is exposed to the outside. The state of the cover 96 shown in FIG. 9 is also referred to as the open state. By opening the cover 96, the battery pack BP can be attached to or detached from the main body 94. The user opens the cover 96 when attaching or detaching the battery pack BP to or from the main body 94, and closes the cover 96 at other times.

[0062] As shown in FIG. 10 , the base portion 92 includes a left fitting portion 108 that fits into a left protrusion 106 (see FIG. 2 ) provided on the left portion of the first grip 20, a right fitting portion 112 that fits into a right protrusion 110 (see FIG. 2 ) provided on the right portion of the first grip 20, and a plate portion 114 that extends between the left fitting portion 108 and the right fitting portion 112. The left fitting portion 108 is fastened to the left protrusion 106 with a screw. The right fitting portion 112 is fastened to the right protrusion 110 with a screw. The main body portion 94 is fixed to the upper surface of the plate portion 114.

[0063] The main body 94 has guide grooves 42, engagement grooves 44, and connection terminals 46 in two locations. The guide grooves 42, engagement grooves 44, and connection terminals 46 of the main body 94 each have the same functions as those of the first battery mounting portion 54 (see FIG. 5). Therefore, two battery packs BP can be mounted on the second battery mounting portion 90a.

[0064] When attaching the battery pack BP to the second battery mounting portion 90a, the battery pack BP is slid forward relative to the second battery mounting portion 90a. This causes the guide rails 36 (see FIG. 3) to fit into the guide grooves 42, and the engagement portions 38 (see FIG. 3) to engage with the engagement grooves 44, completing the attachment of the battery pack BP. With the battery pack BP attached to the second battery mounting portion 90a, the connection terminals 46 enter the battery housing 30 (see FIG. 3) through the slits 32 (see FIG. 3) and engage with the corresponding battery terminals. This electrically connects the battery terminals to the connection terminals 46. When removing the battery pack BP from the second battery mounting portion 90a, the operating portion 40 is pushed in to release the engagement between the engagement portions 38 and the engagement grooves 44, and then the battery pack BP is slid backward relative to the second battery mounting portion 90a. This causes the guide rails 36 to come out of the guide grooves 42, completing the removal of the battery pack BP. Therefore, a user standing behind the transom 4a can handle the battery pack BP in a position close to the user's body when attaching or detaching the battery pack BP to or from the second battery attachment portion 90a, which allows the user standing behind the transom 4a to easily attach or detach the battery pack BP.

[0065] The connection terminal 46 provided on the main body portion 94 is a common member with the connection terminal 46 provided on the first battery attachment portion 54 (see FIG. 5).

[0066] The other end of the cable 88 is connected to the front of the main body 94. The cable 88 is electrically connected to the battery terminal of the battery pack BP attached to the second battery attachment portion 90a via the connection terminal 46 of the second battery attachment portion 90a. Therefore, power from the battery pack BP is supplied to the electric motor 70 via the second battery attachment portion 90a, the cable 88, the adapter 82, and the first battery attachment portion 54.

[0067] Although not shown, in the motor unit 2 of this embodiment, the adapter 82 can be removed from the first battery mounting portion 54, and the battery pack BP can be attached to the first battery mounting portion 54 instead. In this case, the power of the battery pack BP attached to the first battery mounting portion 54 is supplied to the electric motor 70 via the first battery mounting portion 54.

[0068] As shown in FIG. 5 , the motor unit 2 further includes a main power switch 116, an operation switch 118, and a rotation speed adjustment switch 120. The main power switch 116, the operation switch 118, and the rotation speed adjustment switch 120 are disposed on the upper surface of the housing 50, behind the first battery mounting portion 54. A user can switch the main power supply of the motor unit 2 on / off by operating the main power switch 116. When the main power supply of the motor unit 2 is on, a user can switch the operation / stop of the electric motor 70 by operating the operation switch 118. Furthermore, when the main power supply of the motor unit 2 is on, a user can adjust the rotation speed of the output shaft 52 by operating the rotation speed adjustment switch 120.

[0069] (Second Example) As shown in FIG. 11, the work implement of this embodiment includes a working unit 4 (i.e., a rammer 4a) similar to that of the first embodiment, and a motor unit 202. The motor unit 202 differs from the motor unit 2 of the first embodiment in that it includes a second battery mounting portion 204a that is different from the second battery mounting portion 90a (see FIG. 1). The following describes the work implement of the second embodiment, focusing on this difference (i.e., the configuration of the second battery mounting portion 204a). Components that are common between the first and second embodiments are given the same reference numerals, and their description will be omitted.

[0070] A battery device BD is detachably attached to the second battery attachment portion 204a. As shown in FIG. 12, the battery device BD has a substantially rectangular parallelepiped shape. The battery device BD includes a battery housing 252, a handle 254, a main power switch 256, and a charging connector 258. A plurality of rechargeable secondary battery cells (e.g., lithium ion battery cells) are housed inside the battery housing 252. The handle 254 is located at the rear of the battery housing 252. A user can carry the battery device BD detached from the second battery attachment portion 204a by holding the handle 254. The main power switch 256 is located on the left side surface of the battery housing 252. A user can turn the main power of the battery device BD on and off by operating the main power switch 256. The charging connector 258 is located on the left side surface of the battery housing 252, in front of the main power switch 256. A user can charge multiple secondary battery cells using power supplied from an external power source by inserting a charging plug (not shown) connected to an external power source into the charging connector 258. Note that the front-rear, up-down, left-right directions shown in Fig. 12 correspond to the front-rear, up-down, left-right directions shown in Fig. 11 (i.e., the front-rear, up-down, left-right directions of the transom 4a).

[0071] In this embodiment, the cable 88 is connected to the battery device BD instead of being connected to the second battery attachment portion 204a. Therefore, power from the battery device BD is supplied to the electric motor 70 (see FIG. 7) via the cable 88, the adapter 82 (see FIG. 11), and the first battery attachment portion 54 (see FIG. 11). The cable 88 extends from the front of the battery device BD.

[0072] As shown in FIG. 13, the second battery attachment portion 204a includes a base portion 206 that is attached to the handle 10 of the rammer 4a, and a main body portion 208 to which the battery device BD is attached. The base portion 206 includes a left fitting portion 210 that fits with the left protrusion 106 (see FIG. 2) provided on the left portion of the first grip 20, a right fitting portion 212 that fits with the right protrusion 110 (see FIG. 2) provided on the right portion of the first grip 20, and a plate portion 214 that extends between the left fitting portion 210 and the right fitting portion 212. The left fitting portion 210 is fastened to the left protrusion 106 with a screw. The right fitting portion 212 is fastened to the right protrusion 110 with a screw. The main body portion 208 is fixed to the upper surface of the plate portion 214.

[0073] As shown in FIG. 12, the battery device BD includes an engagement claw 260 for engaging with the main body 208 of the second battery mounting portion 204a, and a latch 262 that can be operated by a user. The engagement claw 260 is disposed at the front of the battery housing 252. The latch 262 is disposed at the rear of the battery housing 252. As shown in FIG. 13, the main body 208 includes a claw receiver 216 that corresponds to the engagement claw 260 of the battery device BD, and a latch receiver 218 that corresponds to the latch 262 of the battery device BD. The user can mount the battery device BD on the second battery mounting portion 204a by receiving the engagement claw 260 in the claw receiver 216 and engaging the latch 262 with the latch receiver 218. With the battery device BD mounted on the second battery mounting portion 204a, the user can disengage the latch 262 from the latch receiver 218 by operating the latch 262. The user can remove the battery device BD from the second battery mounting portion 204a by pulling out the engaging claw 260 from the claw receiver 216 while disengaging the latch 262 from the latch receiver 218.

[0074] As shown in Fig. 11, the battery device BD is attached to the second battery attachment portion 204a so that its longitudinal direction is aligned with the front-to-rear direction of the transom 4a. The battery device BD is attached to the second battery attachment portion 204a so that the latch 262 (see Fig. 12) faces rearward. Therefore, the latch 262 is positioned in a position that is easy for a user standing behind the transom 4a to operate. This allows a user standing behind the transom 4a to easily attach and detach the battery device BD.

[0075] The battery device BD can also be detached from the second battery attachment portion 204a and attached to a backpack carrier (not shown) that the user carries on his / her back. In this case, the user carrying the backpack carrier can attach the adapter 82 (see FIG. 11) to a power tool other than the motor unit 2 (for example, the power tool T shown in FIG. 4) to supply power from the battery device BD to the power tool.

[0076] 14 shows a schematic diagram of the flow of power transmission in the work machines of the first and second embodiments. The work machines of the first and second embodiments rotate the output shaft 52 by operating the motor unit 2, 202 (i.e., the electric motor 70). The work machine reduces the rotational motion of the output shaft 52 via a reduction unit and converts it into linear motion via a crank mechanism, thereby converting it into an impact motion (i.e., an action to compact the ground) by the leveling plate 18.

[0077] (Third Example) As shown in Fig. 15, the working machine of this embodiment includes a plate compactor 4b and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0078] The plate compactor 4b includes a main body 300 and a handle 302 attached to the main body 300. The handle 302 includes a grip 304 that a user holds during operation and two support posts 306 extending between the grip 304 and the main body 300. The main body 300 includes a mounting base 308 to which the motor unit 2 is attached, and a leveling plate 310 that is driven by the motor unit 2. The mounting base 308 is similar to the mounting base 12 described in the first embodiment. Therefore, the front mounting portion 56 (see FIG. 6) of the motor unit 2 is attached to the mounting base 308. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, a vibration excitation mechanism (e.g., an eccentric weight) attached to the leveling plate 310 operates, causing the leveling plate 310 to vibrate up and down. The plate compactor 4b vibrates the leveling board 310 up and down while the leveling board 310 is facing the ground, thereby repeatedly pressing the leveling board 310 against the ground. In this way, the plate compactor 4b performs the work of compacting the ground. Figure 17 shows a schematic diagram of the flow of power transmission in the work machine of this embodiment described above.

[0079] In this embodiment, the front-rear, up-down, left-right directions of the plate compactor 4b are defined based on the working posture of the plate compactor 4b. Specifically, the vertical up-down direction when the leveling board 310 is placed on a horizontal surface is defined as the up-down direction of the plate compactor 4b. Also, the direction perpendicular to the up-down direction, that is, the direction from the grip 304 toward the main body 300, is defined as the front direction, and the opposite direction is defined as the rear direction. Also, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0080] The motor unit 2 of this embodiment includes a second battery mounting portion 90b corresponding to the plate compactor 4b, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90b is attached so as to straddle two support posts 306 of the plate compactor 4b. The two support posts 306 extend rearward and upward from the main body 300 and are connected to the grip 304. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to and from the second battery mounting portion 90b. The battery packs BP are attached to the second battery mounting portion 90b by sliding them forward and downward relative to the second battery mounting portion 90b. The battery packs BP are detached from the second battery mounting portion 90b by sliding them rearward and upward relative to the second battery mounting portion 90b. Therefore, a user standing behind the plate compactor 4b can handle the battery pack BP in a position close to the user's body when attaching or detaching the battery pack BP to or from the second battery attachment portion 90b, which allows the user standing behind the plate compactor 4b to easily attach or detach the battery pack BP.

[0081] The adapter 82 is attached to the first battery mounting portion 54 by sliding it leftward relative to the first battery mounting portion 54. The adapter 82 is removed from the first battery mounting portion 54 by sliding it rightward relative to the first battery mounting portion 54. In this embodiment, the first battery mounting portion 54 is located in a position (on the upper surface of the plate compactor 4b) that is easily reachable by the user. This allows the user to easily attach and detach the adapter 82.

[0082] (Fourth Example) As shown in Fig. 16, the working machine of this embodiment includes a plate compactor 4b and a motor unit 202. The plate compactor 4b is the same as that described in the third embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0083] The motor unit 202 of this embodiment is provided with a second battery mounting portion 204b corresponding to the plate compactor 4b, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204b is attached so as to straddle two support columns 306 of the plate compactor 4b. Similar to the second battery mounting portion 204a of the second embodiment, the battery device BD can be attached and detached to the second battery mounting portion 204b.

[0084] The battery device BD is attached to the second battery attachment portion 204b so that the latch 262 (see FIG. 12) faces rearward and upward. Therefore, the latch 262 is disposed in a position that is easy for a user standing behind the plate compactor 4b to operate. This allows a user standing behind the plate compactor 4b to easily attach and detach the battery device BD.

[0085] The adapter 82 is attached to the first battery mounting portion 54 by sliding it leftward relative to the first battery mounting portion 54. The adapter 82 is removed from the first battery mounting portion 54 by sliding it rightward relative to the first battery mounting portion 54. In this embodiment, the first battery mounting portion 54 is located in a position (on the upper surface of the plate compactor 4b) that is easily reachable by the user. This allows the user to easily attach and detach the adapter 82.

[0086] (Fifth Example) As shown in Figure 18, the working machine of this embodiment includes a trowel 4c and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0087] The trowel 4c includes a main body 320 and a handle 322 attached to the main body 320. The handle 322 includes a grip 324 that a user holds during operation and a support 326 extending between the grip 324 and the main body 320. The main body 320 includes a mounting base 328 to which the motor unit 2 is attached and a plurality of blades 330 driven by the motor unit 2. Although not shown, the mounting base 328 has a plurality of through-holes whose positions correspond to the plurality of screw holes 68 (see FIG. 6). The motor unit 2 is attached to the trowel 4c by inserting screws into the plurality of through-holes and threading them into the plurality of screw holes 68, with the lower abutment surface 66 (see FIG. 6) abutting against the upper surface of the mounting base 328. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the plurality of blades 330 rotate. The trowel 4c smooths the surface of the concrete by bringing the rotating surfaces of the multiple blades 330 into contact with the surface of the concrete. Figure 20 shows a schematic diagram of the flow of power transmission in the work machine of this embodiment described above.

[0088] In this embodiment, the front-rear, up-down, left-right directions of the trowel 4c are defined based on the working posture of the trowel 4c. Specifically, the direction along the rotation axis of the plurality of blades 330, from the motor unit 2 toward the plurality of blades 330, is defined as the downward direction, and the opposite direction is defined as the upward direction. Furthermore, the direction perpendicular to the up-down direction, from the grip 324 toward the main body 320, is defined as the forward direction, and the opposite direction is defined as the backward direction. Furthermore, the directions perpendicular to the front-rear and up-down directions are defined as the left-right directions.

[0089] The motor unit 2 of this embodiment includes a second battery mounting portion 90c corresponding to the trowel 4c, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90c is attached to a support post 326 of the trowel 4c. The support post 326 extends rearward and upward from the main body 320 and is connected to the grip 324. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached to and detached from the second battery mounting portion 90c. The battery packs BP are attached to the second battery mounting portion 90c by sliding them forward and downward relative to the second battery mounting portion 90c. The battery packs BP are removed from the second battery mounting portion 90c by sliding them rearward and upward relative to the second battery mounting portion 90c. Therefore, a user standing behind the trowel 4c can handle the battery packs BP close to their body when attaching or detaching them to and from the second battery mounting portion 90c. This allows a user standing behind the trowell 4c to easily attach or detach the battery pack BP. In this embodiment, the two cables 88 extending from the second battery mounting portion 90c are bundled at their respective middle portions 88m to the support posts 326 of the trowell 4c. This prevents the cables 88 from getting in the way during the work.

[0090] The adapter 82 is attached to the first battery attachment portion 54 by sliding it leftward relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it rightward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the upper surface of the trowell 4c). This allows the user to easily attach and detach the adapter 82.

[0091] (Sixth Example) As shown in Figure 19, the work machine of this embodiment includes a trowel 4c and a motor unit 202. The trowel 4c is the same as that described in the fifth embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0092] The motor unit 202 of this embodiment has a second battery mounting portion 204c corresponding to the trowell 4c, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204c is attached to a support 326 of the trowell 4c. Similar to the second battery mounting portion 204a of the second embodiment, the battery device BD can be attached and detached to the second battery mounting portion 204c.

[0093] The battery device BD is attached to the second battery attachment portion 204c so that the latch 262 (see FIG. 12) faces rearward and upward. Therefore, the latch 262 is positioned so that it is easy for a user standing behind the trowell 4c to operate. This allows a user standing behind the trowell 4c to easily attach and detach the battery device BD.

[0094] The adapter 82 is attached to the first battery attachment portion 54 by sliding it leftward relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it rightward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the upper surface of the trowell 4c). This allows the user to easily attach and detach the adapter 82.

[0095] (Seventh Example) As shown in Fig. 21, the working machine of this embodiment includes a concrete mixer 4d and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0096] The concrete mixer 4d includes a main body 340 and a handle 342 attached to the main body 340. The handle 342 includes a grip 344 that a user holds during operation and two support posts 346 extending between the grip 344 and the main body 340. The main body 340 includes a mounting base 348 to which the motor unit 2 is attached, a rotating drum 350 driven by the motor unit 2, and a carriage portion 354 including wheels 352. The mounting base 348 is similar to the mounting base 12 described in the first embodiment. Therefore, the front mounting portion 56 (see FIG. 6) of the motor unit 2 is attached to the mounting base 348. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the rotating drum 350 rotates. Concrete is contained in the rotating drum 350. The concrete mixer 4d mixes concrete by rotating the rotating drum 350. The flow of power transmission in the working machine of this embodiment is shown schematically in Figure 23. In addition, with the carriage 354 (i.e., the wheels 352) placed on the ground, the user can move the concrete mixer 4d by grasping the grip 344 and pushing the concrete mixer 4d.

[0097] In this embodiment, the front-rear, up-down, left-right directions of the concrete mixer 4d are defined based on the working posture of the concrete mixer 4d. Specifically, the vertical up-down direction when the carriage 354 (i.e., the wheels 352) is placed on a horizontal surface is defined as the up-down direction of the concrete mixer 4d. Furthermore, the direction perpendicular to the up-down direction, that is, the direction from the grip 344 toward the main body 340, is defined as the front direction, and the opposite direction is defined as the rear direction. Furthermore, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0098] The motor unit 2 of this embodiment includes a second battery mounting portion 90d corresponding to the concrete mixer 4d, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90d is attached so as to straddle two support posts 346 of the concrete mixer 4d. The two support posts 346 extend rearward and upward from the main body 340, then bend and extend rearward, and connect to the grip 344. The second battery mounting portion 90d is attached to the rearward-extending portions of the two support posts 346 (i.e., portions closer to the grip 344 than the bent portions). Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to the second battery mounting portion 90d. The battery packs BP are attached to the second battery mounting portion 90d by sliding them forward relative to the second battery mounting portion 90d. The battery pack BP can be removed from the second battery mounting portion 90d by sliding it rearward relative to the second battery mounting portion 90d. Therefore, a user standing behind the concrete mixer 4d can handle the battery pack BP close to their body when attaching or detaching the battery pack BP to or from the second battery mounting portion 90d. This allows a user standing behind the concrete mixer 4d to easily attach or detach the battery pack BP.

[0099] The adapter 82 is attached to the first battery attachment portion 54 by sliding it forward relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it backward relative to the first battery attachment portion 54.

[0100] (Eighth Example) As shown in Figure 22, the working machine of this embodiment includes a concrete mixer 4d and a motor unit 202. The concrete mixer 4d is the same as that described in the seventh embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0101] The motor unit 202 of this embodiment includes a second battery mounting portion 204d corresponding to the concrete mixer 4d, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204d is mounted so as to straddle the two support columns 346 at a portion that extends rearward from the two support columns 346 (i.e., a portion that is closer to the grip 344 than the bent portion). Similar to the second battery mounting portion 204a of the second embodiment, a battery device BD can be attached and detached to the second battery mounting portion 204d.

[0102] The battery device BD is attached to the second battery attachment portion 204d so that the latch 262 (see FIG. 12) faces rearward. Therefore, the latch 262 is positioned in a position that is easy for a user standing behind the concrete mixer 4d to operate. This allows a user standing behind the concrete mixer 4d to easily attach and detach the battery device BD.

[0103] The adapter 82 is attached to the first battery attachment portion 54 by sliding it forward relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it backward relative to the first battery attachment portion 54.

[0104] (Ninth Example) As shown in Figure 24, the work machine of this embodiment includes a concrete saw 4e and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0105] The concrete saw 4e includes a main body 360 and a handle 362 attached to the main body 360. The handle 362 includes a grip 364 that a user holds during operation and a support 366 extending between the grip 364 and the main body 360. The main body 360 includes a mounting base 368 to which the motor unit 2 is attached, a rotary blade 370 driven by the motor unit 2, and a carriage portion 374 including wheels 372. The mounting base 368 is similar to the mounting base 328 (see FIG. 18) described in the fifth embodiment. Therefore, the lower mounting portion 64 (see FIG. 6) of the motor unit 2 is attached to the mounting base 368. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the rotary blade 370 rotates. The concrete saw 4e uses the rotary blade 370 to make cuts (also called joints) in concrete laid on the ground. The flow of power transmission in the work machine of this embodiment is shown schematically in Figure 26. Furthermore, with the carriage 374 (i.e., the wheels 372) placed on the ground, the user can move the concrete saw 4e by grasping the grip 364 and pushing the concrete saw 4e.

[0106] In this embodiment, the front-rear, up-down, left-right directions of the concrete saw 4e are defined based on the working posture of the concrete saw 4e. Specifically, the vertical up-down direction when the carriage 374 (i.e., the wheels 372) is placed on a horizontal surface is defined as the up-down direction of the concrete saw 4e. Furthermore, the direction perpendicular to the up-down direction, that is, the direction from the grip 364 toward the main body 360, is defined as the forward direction, and the opposite direction is defined as the rearward direction. Furthermore, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0107] The motor unit 2 of this embodiment includes a second battery mounting portion 90e corresponding to the concrete saw 4e, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90e is attached to a support 366 of the concrete saw 4e. The support 366 extends rearward and upward from the main body 360 and is connected to the grip 364. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to and from the second battery mounting portion 90e. The battery packs BP are attached to the second battery mounting portion 90e by sliding them forward and downward relative to the second battery mounting portion 90e. The battery packs BP are detached from the second battery mounting portion 90e by sliding them rearward and upward relative to the second battery mounting portion 90e. Therefore, a user standing behind the concrete saw 4e can handle the battery packs BP close to their body when attaching or detaching the battery packs BP to or from the second battery mounting portion 90e. Therefore, a user standing behind the concrete saw 4e can easily attach and detach the battery pack BP.

[0108] The adapter 82 is attached to the first battery attachment portion 54 by sliding it to the right relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it to the left relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the top surface of the concrete saw 4e). This allows the user to easily attach and detach the adapter 82.

[0109] (Tenth Example) As shown in Figure 25, the work machine of this embodiment includes a concrete saw 4e and a motor unit 202. The concrete saw 4e is the same as that described in the ninth embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0110] The motor unit 202 of this embodiment includes a second battery attachment portion 204e corresponding to the concrete saw 4e, instead of the second battery attachment portion 204a (see FIG. 13) described in the second embodiment. The second battery attachment portion 204e is attached to a support 366 of the concrete saw 4e. Similar to the second battery attachment portion 204a of the second embodiment, the battery device BD can be attached and detached to the second battery attachment portion 204e.

[0111] The battery device BD is attached to the second battery attachment portion 204e so that the latch 262 (see FIG. 12) faces rearward and upward. Therefore, the latch 262 is positioned in a position that is easy for a user standing behind the concrete saw 4e to operate. This allows the user standing behind the concrete saw 4e to easily attach and detach the battery device BD.

[0112] The adapter 82 is attached to the first battery attachment portion 54 by sliding it to the right relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it to the left relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the top surface of the concrete saw 4e). This allows the user to easily attach and detach the adapter 82.

[0113] (Eleventh Example) As shown in Figure 27, the working machine of this embodiment includes a high-pressure washer 4f and a motor unit 2. The motor unit 2 is similar to that described in the first embodiment.

[0114] The high-pressure washer 4f includes a main body 380 and a handle 382 attached to the main body 380. The handle 382 includes a grip 384 that a user holds during operation and two support posts 386 extending between the grip 384 and the main body 380. The main body 380 includes a pump 388 driven by the motor unit 2 and a carriage portion 392 including wheels 390. The pump 388 is provided with a mounting base 394 to which the motor unit 2 is attached. The mounting base 394 is similar to the mounting base 12 described in the first embodiment. Therefore, the front mounting portion 56 (see FIG. 6) of the motor unit 2 is attached to the mounting base 394. In addition, a water supply hose (not shown) connected to a water supply source (e.g., a water supply system) and a water discharge hose (not shown) equipped with a spray nozzle at its tip are connected to the pump 388. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the pump 388 is driven and pressure-feeds water supplied from the water supply hose toward the water discharge hose. This causes water to be sprayed from the spray nozzle. The high-pressure washer 4f cleans an object (e.g., an automobile) with the water sprayed from the spray nozzle. FIG. 29 schematically shows the flow of power transmission in the work machine of this embodiment described above. In addition, a user can move the high-pressure washer 4f by holding the grip 384 and pushing the high-pressure washer 4f with the cart section 392 (i.e., the wheels 390) placed on the ground.

[0115] In this embodiment, the front-rear, up-down, left-right directions of the high-pressure washer 4f are defined based on the working posture of the high-pressure washer 4f. Specifically, the vertical up-down direction when the cart unit 392 (i.e., the wheels 390) is placed on a horizontal surface is defined as the up-down direction of the high-pressure washer 4f. Also, the direction perpendicular to the up-down direction, that is, the direction from the grip 384 toward the main body 380, is defined as the forward direction, and the opposite direction is defined as the rearward direction. Also, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0116] The motor unit 2 of this embodiment includes a second battery mounting portion 90f compatible with the high-pressure washer 4f, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90f is attached so as to straddle two support posts 386 of the high-pressure washer 4f. The two support posts 386 extend rearward and upward from the main body 380 and are connected to the grip 384. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to and from the second battery mounting portion 90f. The battery packs BP are attached to the second battery mounting portion 90f by sliding them forward and downward relative to the second battery mounting portion 90f. The battery packs BP are detached from the second battery mounting portion 90f by sliding them rearward and upward relative to the second battery mounting portion 90f. Therefore, a user standing behind the high-pressure washer 4f can handle the battery pack BP close to the user's body when attaching or detaching the battery pack BP to or from the second battery attachment portion 90f, which makes it easy for a user standing behind the high-pressure washer 4f to attach or detach the battery pack BP.

[0117] The adapter 82 is attached to the first battery attachment portion 54 by sliding it forward relative to the first battery attachment portion 54. The adapter 82 is detached from the first battery attachment portion 54 by sliding it backward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is disposed in a position (on the top surface of the high-pressure washer 4f) that is easily reachable by the user. This allows the user to easily attach and detach the adapter 82.

[0118] (Twelfth Example) As shown in Fig. 28, the work machine of this embodiment includes a high-pressure washer 4f and a motor unit 202. The high-pressure washer 4f is the same as that described in the eleventh embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0119] The motor unit 202 of this embodiment includes a second battery mounting portion 204f compatible with the high-pressure washer 4f, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204f is mounted so as to straddle two support columns 386. Similar to the second battery mounting portion 204a of the second embodiment, the battery device BD can be attached and detached to the second battery mounting portion 204f.

[0120] The battery device BD is attached to the second battery attachment portion 204f so that the latch 262 (see FIG. 12) faces rearward and upward. Therefore, the latch 262 is located at a position that is easy for a user standing behind the high-pressure washer 4f to operate. This allows the user standing behind the high-pressure washer 4f to easily attach and detach the battery device BD.

[0121] The adapter 82 is attached to the first battery attachment portion 54 by sliding it forward relative to the first battery attachment portion 54. The adapter 82 is detached from the first battery attachment portion 54 by sliding it backward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is disposed in a position (on the top surface of the high-pressure washer 4f) that is easily reachable by the user. This allows the user to easily attach and detach the adapter 82.

[0122] (13th Example) As shown in Figure 30, the working machine of this embodiment includes a sprayer 4g and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0123] The sprayer 4g includes a pump 400, a reel 404 around which a hose 402 is wound, and a frame 406 that supports the pump 400 and the reel 404. The pump 400 is provided with a mounting base 408 to which the motor unit 2 is attached. The mounting base 408 is similar to the mounting base 12 described in the first embodiment. Therefore, the front mounting portion 56 (see FIG. 6) of the motor unit 2 is attached to the mounting base 408. The pump 400 is also connected to a tank (not shown) that stores liquid and a hose 402. A spray nozzle (not shown) is provided at the tip of the hose 402. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the pump 400 is driven and pressure-feeds the liquid stored in the tank toward the hose 402. As a result, the liquid is sprayed from the spray nozzle. The sprayer 4g sprays the liquid (e.g., pesticide) stored in the tank. FIG. 32 shows a schematic diagram of the flow of power transmission in the working machine of this embodiment.

[0124] In this embodiment, the front-rear, up-down, left-right directions of the sprayer 4g are defined based on the working posture of the sprayer 4g. Specifically, the vertical up-down direction when the frame 406 is placed on a horizontal surface is defined as the up-down direction of the sprayer 4g. Also, the direction perpendicular to the up-down direction, from the pump 400 to the reel 404, is defined as the front direction, and the opposite direction is defined as the rear direction. Also, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0125] The motor unit 2 of this embodiment includes a second battery mounting portion 90g corresponding to the sprayer 4g, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90g is attached to the upper end of the frame 406. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to the second battery mounting portion 90g. The battery pack BP is attached to the second battery mounting portion 90g by sliding it backward relative to the second battery mounting portion 90g. The battery pack BP is detached from the second battery mounting portion 90g by sliding it forward relative to the second battery mounting portion 90g. In this embodiment, the second battery mounting portion 90g is located in a position (on the top surface of the sprayer 4g) that is easily accessible to the user. This allows the user to easily attach and detach the battery pack BP.

[0126] The adapter 82 is attached to the first battery attachment portion 54 by sliding it forward relative to the first battery attachment portion 54. The adapter 82 is detached from the first battery attachment portion 54 by sliding it backward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position (on the top surface of the sprayer 4g) that is easily reachable by the user. This allows the user to easily attach and detach the adapter 82.

[0127] (14th Example) As shown in Figure 31, the work machine of this embodiment includes a sprayer 4g and a motor unit 202. The sprayer 4g is the same as that described in the thirteenth embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0128] The motor unit 202 of this embodiment is provided with a second battery mounting portion 204g corresponding to the sprayer 4g, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204g is attached to the upper end of the frame 406. As with the second battery mounting portion 204a of the second embodiment, the battery device BD can be attached and detached to and from the second battery mounting portion 204g. In this embodiment, the second battery mounting portion 204g is located in a position (on the top surface of the sprayer 4g) that is easily reachable by the user. This allows the user to easily attach and detach the battery device BD.

[0129] The adapter 82 is attached to the first battery attachment portion 54 by sliding it forward relative to the first battery attachment portion 54. The adapter 82 is detached from the first battery attachment portion 54 by sliding it backward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position (on the top surface of the sprayer 4g) that is easily reachable by the user. This allows the user to easily attach and detach the adapter 82.

[0130] (15th Example) As shown in Figure 33, the working machine of this embodiment includes a lawnmower 4h and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0131] The lawnmower 4h comprises a main body 420 and a handle 422 attached to the main body 420. The handle 422 comprises a grip 424 that the user holds during operation and two support posts 426 extending between the grip 424 and the main body 420. The main body 420 comprises a mounting base 428 to which the motor unit 2 is attached, a reel blade 430 driven by the motor unit 2, and a housing 434 provided with wheels 432. The mounting base 428 is similar to the mounting base 328 (see FIG. 18) described in the fifth embodiment. Therefore, the lower mounting portion 64 (see FIG. 6) of the motor unit 2 is attached to the mounting base 428. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the reel blade 430 rotates. The lawnmower 4h cuts the grass by pinching the grass between a rotating reel blade 430 and a fixed blade (not shown) fixed to a housing 434. Figure 35 shows a schematic diagram of the flow of power transmission in the working machine of this embodiment described above. Furthermore, with the housing 434 (i.e., the wheels 432) placed on the ground, the user can move the lawnmower 4h by grasping the grip 424 and pushing the lawnmower 4h.

[0132] In this embodiment, the front-rear, up-down, left-right directions of the lawnmower 4h are defined based on the working posture of the lawnmower 4h. Specifically, the vertical up-down direction when the housing 434 (i.e., the wheels 432) is placed on a horizontal surface is defined as the up-down direction of the lawnmower 4h. Furthermore, the direction perpendicular to the up-down direction, that is, the direction from the grip 424 toward the main body 420, is defined as the front direction, and the opposite direction is defined as the rear direction. Furthermore, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0133] The motor unit 2 of this embodiment includes a second battery mounting portion 90h corresponding to the lawnmower 4h, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90h is attached so as to straddle two support posts 426 of the lawnmower 4h. The two support posts 426 extend rearward and upward from the main body 420 and connect to the grip 424. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to the second battery mounting portion 90h. The battery packs BP are attached to the second battery mounting portion 90h by sliding them forward and downward relative to the second battery mounting portion 90h. The battery packs BP are removed from the second battery mounting portion 90h by sliding them rearward and upward relative to the second battery mounting portion 90h. Therefore, a user standing behind the lawnmower 4h can handle the battery pack BP in a position close to the user's body when attaching or detaching the battery pack BP to or from the second battery attachment portion 90h, making it easy for a user standing behind the lawnmower 4h to attach or detach the battery pack BP.

[0134] The adapter 82 is attached to the first battery attachment portion 54 by sliding it leftward relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it rightward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the top surface of the lawnmower 4h). This allows the user to easily attach and detach the adapter 82.

[0135] (16th Example) As shown in Figure 34, the working machine of this embodiment includes a lawnmower 4h and a motor unit 202. The lawnmower 4h is the same as that described in the fifteenth embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0136] The motor unit 202 of this embodiment is provided with a second battery mounting portion 204h compatible with the lawnmower 4h, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204h is attached so as to straddle two support posts 426. Similar to the second battery mounting portion 204a of the second embodiment, the battery device BD can be attached and detached to the second battery mounting portion 204h.

[0137] The battery device BD is attached to the second battery attachment portion 204h so that the latch 262 (see FIG. 12) faces rearward and upward. Therefore, the latch 262 is positioned in a way that makes it easy for a user standing behind the lawnmower 4h to operate. This makes it easy for a user standing behind the lawnmower 4h to attach and detach the battery device BD.

[0138] The adapter 82 is attached to the first battery attachment portion 54 by sliding it leftward relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it rightward relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the top surface of the lawnmower 4h). This allows the user to easily attach and detach the adapter 82.

[0139] (17th Example) As shown in Figure 36, the working machine of this embodiment includes a compaction roller 4i and a motor unit 2. The motor unit 2 is the same as that described in the first embodiment.

[0140] The compaction roller 4i includes a main body 440 and a handle 442 attached to the main body 440. The handle 442 includes a grip 444 that a user holds during operation and a support 446 (see FIG. 37) extending between the grip 444 and the main body 440. The main body 440 includes a mounting base 448 to which the motor unit 2 is attached and a roller 450 driven by the motor unit 2. The mounting base 448 is similar to the mounting base 12 described in the first embodiment. Therefore, the front mounting portion 56 (see FIG. 6) of the motor unit 2 is attached to the mounting base 448. When the electric motor 70 (see FIG. 7) of the motor unit 2 operates, the roller 450 rotates and a vibration generating mechanism (e.g., an eccentric weight) built into the roller 450 operates. The compaction roller 4i moves over the ground while pressing the vibrating roller 450 against the ground. In this way, the compaction roller 4i performs the work of compacting the ground. Figure 38 shows a schematic diagram of the flow of power transmission in the work machine of this embodiment described above.

[0141] In this embodiment, the front-rear, up-down, left-right directions of the compaction roller 4i are defined based on the working posture of the compaction roller 4i. Specifically, the vertical up-down direction when the roller 450 is placed on a horizontal surface is defined as the up-down direction of the compaction roller 4i. Furthermore, the direction perpendicular to the up-down direction, that is, the direction from the grip 444 toward the main body 440, is defined as the front direction, and the opposite direction is defined as the rear direction. Furthermore, the direction perpendicular to the front-rear and up-down directions is defined as the left-right direction.

[0142] The motor unit 2 of this embodiment includes a second battery mounting portion 90i corresponding to the compaction roller 4i, instead of the second battery mounting portion 90a (see FIG. 5) described in the first embodiment. The second battery mounting portion 90i is attached to a support post 446 of the compaction roller 4i. The support post 446 extends rearward and upward from the main body 440 and is connected to the grip 444. Similar to the second battery mounting portion 90a of the first embodiment, two battery packs BP can be attached and detached to and from the second battery mounting portion 90i. The battery packs BP are attached to the second battery mounting portion 90i by sliding them forward and downward relative to the second battery mounting portion 90i. The battery packs BP are detached from the second battery mounting portion 90i by sliding them rearward and upward relative to the second battery mounting portion 90i. Therefore, a user standing behind the compaction roller 4i can handle the battery packs BP close to their body when attaching or detaching them to and from the second battery mounting portion 90i. Therefore, a user standing behind the compaction roller 4i can easily perform the work of attaching and detaching the battery pack BP.

[0143] The adapter 82 is attached to the first battery attachment portion 54 by sliding it to the right relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it to the left relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the upper surface of the compaction roller 4i). This allows the user to easily attach and detach the adapter 82.

[0144] (18th Example) As shown in Figure 37, the working machine of this embodiment includes a compaction roller 4i and a motor unit 202. The compaction roller 4i is the same as that described in the 17th embodiment. The motor unit 202 is the same as that described in the second embodiment.

[0145] The motor unit 202 of this embodiment includes a second battery mounting portion 204i corresponding to the compaction roller 4i, instead of the second battery mounting portion 204a (see FIG. 13) described in the second embodiment. The second battery mounting portion 204i is attached to the upper surface of the main body 440. As with the second battery mounting portion 204a of the second embodiment, the battery device BD can be attached and detached to the second battery mounting portion 204i. The battery device BD is attached to the second battery mounting portion 204i so that the latch 262 faces forward. In this embodiment, the second battery mounting portion 204i is located in a position (on the upper surface of the compaction roller 4i) that is easily reachable by the user. This allows the user to easily attach and detach the battery device BD.

[0146] The adapter 82 is attached to the first battery attachment portion 54 by sliding it to the right relative to the first battery attachment portion 54. The adapter 82 is removed from the first battery attachment portion 54 by sliding it to the left relative to the first battery attachment portion 54. In this embodiment, the first battery attachment portion 54 is located in a position that is easily reachable by the user (on the upper surface of the compaction roller 4i). This allows the user to easily attach and detach the adapter 82.

[0147] In this specification, the second battery mounting portions 90a, 90b, 90c, 90d, 90e, 90f, 90g, 90h, and 90i may be collectively referred to as "second battery mounting portions 90." The second battery mounting portions 204a, 204b, 204c, 204d, 204e, 204f, 204g, 204h, and 204i may be collectively referred to as "second battery mounting portions 204."

[0148] (Variation) (See Figures 5, 10, etc.) The number of battery packs BP that can be attached to the first battery attachment portion 54 may be one, or may be three or more. Similarly, the number of battery packs BP that can be attached to the second battery attachment portion 90 may be one, or may be three or more.

[0149] (See FIG. 8, etc.) The adapter 82 may be non-detachably attached to the first battery attachment portion 54. In other words, after the adapter 82 is attached to the first battery attachment portion 54, it may be prohibited to remove the adapter 82 from the first battery attachment portion 54.

[0150] (See FIG. 7, etc.) The motor unit 2 does not necessarily have to include the first battery mounting portion 54 and the adapter 82. In this case, the cable 88 may connect between the housing 50 and the second battery mounting portion 90, instead of connecting between the adapter 82 and the second battery mounting portion 90. Electric power from the battery pack BP attached to the second battery mounting portion 90 may be supplied to the electric motor 70 inside the housing 50 via the second battery mounting portion 90 and the cable 88.

[0151] (See FIG. 7, etc.) The motor unit 202 does not necessarily have to include the first battery mounting portion 54 and the adapter 82. In this case, the cable 88 may connect between the housing 50 and the second battery mounting portion 204, instead of connecting between the adapter 82 and the second battery mounting portion 204. Electric power from the battery device BD attached to the second battery mounting portion 204 may be supplied to the electric motor 70 inside the housing 50 via the second battery mounting portion 204 and the cable 88.

[0152] (See FIG. 7, etc.) The control circuit board 74 may be disposed outside the housing 50. For example, the control circuit board 74 may be disposed on the working unit 4. The control circuit board 74 may be integrated with the second battery mounting portion 90 (or the second battery mounting portion 204).

[0153] (See FIG. 6, etc.) The motor unit 2 (or the motor unit 202) may not have one of the front contact surface 58 and the lower contact surface 66.

[0154] (See FIG. 9, etc.) The motor unit 2 does not necessarily have to include the cover portion 96.

[0155] (See FIG. 10, etc.) The second battery mounting portion 90 may be divided into a first portion to which one battery pack BP is attached and a second portion to which the remaining battery pack BP is attached. The first portion and the second portion may be disposed separately from each other on the handle of the working unit 4.

[0156] (See Figures 1, 11, etc.) The second battery mounting portion 90 (or the second battery mounting portion 204) may be disposed in a location that is neither on the handle of the working unit 4 nor on the top surface of the working unit 4 (for example, on the side of the working unit 4). This allows the battery pack BP (or the battery device BD) to be attached in a location that is neither on the handle of the working unit 4 nor on the top surface of the working unit 4 (for example, on the side of the working unit 4).

[0157] (See FIGS. 5, 10, etc.) The first battery mounting portion 54 and the second battery mounting portion 90 do not necessarily have to include members with a common shape.

[0158] (See Figures 1, 11, etc.) The length of the cable 88 may be less than 100 mm or may be more than 2000 mm.

[0159] (Features related to motor unit 2) In one or more embodiments, the motor unit 2 is detachably attached to each of a plurality of types of working units 4 and operates the working units 4. The motor unit 2 includes an output shaft 52 connected to the working unit 4, an electric motor 70 that rotates the output shaft 52, a housing 50 that accommodates the electric motor 70, a first battery mounting portion 54 that is disposed on the housing 50 and to which a battery pack BP (an example of a first battery) is detachably attached, a second battery mounting portion 90 that is disposed on the working unit 4 and to which the battery pack BP (an example of a second battery) is detachably attached, an adapter 82 that is attached to the first battery mounting portion 54 in place of the battery pack BP, a cable 88 that extends from the adapter 82 and connects to the second battery mounting portion 90, and a control circuit board 74 that controls the output of the electric motor 70. When the battery pack BP is attached to the first battery mounting portion 54, power is supplied from the battery pack BP to the electric motor 70 via the first battery mounting portion 54. When the adapter 82 is attached to the first battery mounting portion 54 and the battery pack BP is attached to the second battery mounting portion 90, power is supplied from the battery pack BP to the electric motor 70 via the cable 88, the adapter 82, and the first battery mounting portion 54.

[0160] According to the above configuration, the battery pack BP can be attached to the second battery attachment portion 90 arranged on the working unit 4. By attaching the battery pack BP to the second battery attachment portion 90, it is possible to suppress transmission of vibrations of the housing 50 to the battery pack BP, compared to when the battery pack BP is attached to the housing 50.

[0161] In one or more embodiments, the motor unit 2 is detachably attached to each of a plurality of types of working units 4 and operates the working units 4. The motor unit 2 includes an output shaft 52 connected to the working unit 4, an electric motor 70 that rotates the output shaft 52, a housing 50 that houses the electric motor 70, a second battery mounting portion 90 (an example of a battery mounting portion) that is disposed on the working unit 4 and to which a battery pack BP (an example of a battery) is detachably attached, a cable 88 that extends from the housing 50 and connects to the second battery mounting portion 90, and a control circuit board 74 that is disposed within the housing 50 and controls the output of the electric motor 70. When the battery pack BP is attached to the second battery mounting portion 90, power is supplied from the battery pack BP to the electric motor 70 via the cable 88.

[0162] According to the above configuration, the battery pack BP can be attached to the second battery attachment portion 90 arranged on the working unit 4. By attaching the battery pack BP to the second battery attachment portion 90, it is possible to suppress transmission of vibrations of the housing 50 to the battery pack BP, compared to when the battery pack BP is attached to the housing 50.

[0163] In one or more embodiments, the control circuit board 74 is disposed within the housing 50 .

[0164] A fan 72 for cooling the electric motor 70 is provided inside the housing 50. According to the above configuration, the cooling air generated by the fan 72 can cool the electric motor 70 as well as the control circuit board 74. Therefore, there is no need to separately mount a fan 72 for cooling the control circuit board 74 on the motor unit 2, and the configuration of the motor unit 2 can be simplified.

[0165] In one or more embodiments, the motor unit 2 further includes a lower abutment surface 66 (an example of a first surface) that is parallel to the axial direction of the output shaft 52, and a front abutment surface 58 (an example of a second surface) that is perpendicular to the axial direction of the output shaft 52. The motor unit 2 is fixed to the working unit 4 with at least one of the lower abutment surface 66 and the front abutment surface 58 abutting against the working unit 4.

[0166] According to the above configuration, the motor unit 2 can be attached to the working unit 4 in a number of positions (for example, a position in which the lower contact surface 66 is in contact with the working unit 4, or a position in which the front contact surface 58 is in contact with the working unit 4). As a result, the number of types of working units 4 to which the motor unit 2 can be attached can be increased.

[0167] In one or more embodiments, the battery pack BP can be detached from the motor unit 2 and attached to an electrical device (eg, a power tool T) other than the motor unit 2, thereby supplying power to the electrical device as well.

[0168] According to the above configuration, the battery pack BP can be shared between the motor unit 2 and an electric device other than the motor unit 2.

[0169] In one or more embodiments, the second battery mounting portion 90 mounts multiple battery packs BP.

[0170] According to the above configuration, multiple battery packs BP can be attached to the second battery attachment portion 90, so the electric motor 70 can be operated using power from multiple battery packs BP. This allows the output of the electric motor 70 to be higher than when the electric motor 70 is operated using power from, for example, a single battery pack BP. As a result, the motor unit 2 can be applied to working units 4 that require high output. In other words, the number of types of working units 4 to which the motor unit 2 can be applied can be increased.

[0171] In one or more embodiments, the motor unit 2 further includes a cover portion 96 (an example of a cover) that covers the battery pack BP attached to the second battery attachment portion 90.

[0172] According to the above configuration, the battery pack BP attached to the second battery attachment portion 90 can be protected from water and dust flying in from the outside.

[0173] In one or more embodiments, the working unit 4 includes a handle 10, 302, 322, 342, 362, 382, ​​422, 442 that includes a grip that can be held by a user. The second battery mounting portion 90 is disposed on the handle 10, 302, 322, 342, 362, 382, ​​422, 442.

[0174] According to the above configuration, the second battery mounting portion 90 is disposed on the handle 10, 302, 322, 342, 362, 382, ​​422, 442. The handle 10, 302, 322, 342, 362, 382, ​​422, 442 may be configured to reduce the transmission of vibrations from the main body of the working unit 4 to prevent discomfort to the user holding the grip. Therefore, by attaching the battery pack BP to the second battery mounting portion 90, it is possible to prevent vibrations from being transmitted to the main body of the working unit 4. Furthermore, according to the above configuration, the second battery mounting portion 90 is disposed in a position that is easily accessible to the user. This allows the user to easily attach and detach the battery pack BP to the second battery mounting portion 90.

[0175] In one or more embodiments, the second battery mounting portion 90 is disposed on the upper surface of the working unit 4 when the working unit 4 is in a working position.

[0176] According to the above configuration, the second battery mounting portion 90 is disposed in a position that is easily reachable by the user, which allows the user to easily attach and detach the battery pack BP to and from the second battery mounting portion 90.

[0177] In one or more embodiments, the first battery mounting portion 54 and the second battery mounting portion 90 each include a connection terminal 46 (an example of a common member) that has a common shape.

[0178] According to the above configuration, it is possible to use common components between the first battery mounting portion 54 and the second battery mounting portion 90. This allows the manufacturing cost of the motor unit 2 to be reduced.

[0179] In one or more embodiments, the length of the cable 88 is in the range of 100 mm to 2000 mm.

[0180] The cable 88 extends between the first battery mounting portion 54 disposed on the housing 50 and the second battery mounting portion 90 disposed on the working unit 4. If the length of the cable 88 is excessively long compared to the distance between the first battery mounting portion 54 and the second battery mounting portion 90, the cable 88 may become excessively loose and interfere with work. The distance between the first battery mounting portion 54 and the second battery mounting portion 90 varies depending on the type of working unit 4, but is expected to be generally within a range of 50 mm to 1500 mm. With the above configuration, the length of the cable 88 can be set to a length slightly longer than the expected distance between the first battery mounting portion 54 and the second battery mounting portion 90. This prevents the cable 88 from becoming excessively loose, thereby preventing the cable 88 from interfering with work.

[0181] In one or more embodiments, the adapter 82 is removably attached to the first battery mounting portion 54 .

[0182] If the adapter 82 is non-detachably attached to the first battery attachment portion 54, the adapter 82 cannot be removed from the first battery attachment portion 54 thereafter. However, there are cases where it is desired to remove the adapter 82 from the first battery attachment portion 54 even after the adapter 82 has been attached to the first battery attachment portion 54. For example, there are cases where it is desired to attach a battery pack BP to the first battery attachment portion 54 instead of the adapter 82. According to the above configuration, the adapter 82 is detachably attached to the first battery attachment portion 54. As a result, even after the adapter 82 has been attached to the first battery attachment portion 54, the adapter 82 can be removed from the first battery attachment portion 54. As a result, the battery pack BP can be attached to the first battery attachment portion 54 instead of the adapter 82.

[0183] In one or more embodiments, the working unit 4 functions as a rammer 4a that compacts the ground. The working unit 4 includes a handle 10 that includes grips 20, 22, 24 that can be held by a user. A second battery mounting portion 90 is disposed on the handle 10.

[0184] According to the above configuration, the battery pack BP can be attached to the handle 10 of the rammer 4a. This makes it possible to prevent vibrations from the housing 50 from being transmitted to the battery pack BP. Also, it makes it possible to prevent vibrations from the working part 6 of the rammer 4a (an example of the main body of the rammer) from being transmitted to the battery pack BP.

[0185] In one or more embodiments, the working unit 4 functions as a plate compactor 4b that compacts the ground. The working unit 4 includes a handle 302 that includes a grip 304 that can be held by a user. The second battery mounting portion 90 is disposed on the handle 302.

[0186] According to the above configuration, the battery pack BP can be attached to the handle 302 of the plate compactor 4b. This makes it possible to suppress transmission of vibrations of the housing 50 to the battery pack BP. Also, it makes it possible to suppress transmission of vibrations of the main body 300 of the plate compactor 4b to the battery pack BP.

[0187] In one or more embodiments, the working unit 4 functions as a trowel 4c for leveling the surface of concrete. The working unit 4 includes a handle 322 that includes a grip 324 that can be held by a user. The second battery mounting portion 90 is disposed on the handle 322.

[0188] According to the above configuration, the battery pack BP can be attached to the handle 322 of the trowel 4c. This prevents vibrations from the housing 50 from being transmitted to the battery pack BP. Also, it prevents vibrations from the main body 320 of the trowel 4c from being transmitted to the battery pack BP.

[0189] In one or more embodiments, the operational unit 4 functions as a concrete mixer 4d for mixing concrete. The operational unit 4 includes a handle 342 including a grip 344 that can be held by a user. The second battery mounting portion 90 is disposed on the handle 342.

[0190] According to the above configuration, the battery pack BP can be attached to the handle 342 of the concrete mixer 4d. This makes it possible to suppress transmission of vibrations from the housing 50 to the battery pack BP. Also, it makes it possible to suppress transmission of vibrations from the main body 340 of the concrete mixer 4d to the battery pack BP.

[0191] In one or more embodiments, the working unit 4 functions as a concrete saw 4e for cutting into concrete. The working unit 4 includes a handle 362 that includes a user-graspable grip 364. The second battery mount 90 is disposed on the handle 362.

[0192] According to the above configuration, the battery pack BP can be attached to the handle 362 of the concrete saw 4e. This makes it possible to suppress transmission of vibrations from the housing 50 to the battery pack BP. It also makes it possible to suppress transmission of vibrations from the body 360 of the concrete saw 4e to the battery pack BP.

[0193] In one or more embodiments, the working unit 4 functions as a high-pressure washer 4f (or sprayer 4g) (an example of a sprayer) that pressurizes and sprays liquid. The second battery mounting portion 90 is disposed on the upper surface of the working unit 4 when the working unit 4 is in a working position.

[0194] According to the above configuration, the battery pack BP can be attached to the upper surface of the high-pressure washer 4f (or the sprayer 4g), which makes it possible to suppress transmission of vibrations of the housing 50 to the battery pack BP.

[0195] In one or more embodiments, the working unit 4 functions as a lawnmower 4h. The working unit 4 includes a handle 422 including a grip 424 that can be held by a user. The second battery mounting portion 90 is disposed on the handle 422.

[0196] According to the above configuration, the battery pack BP can be attached to the handle 422 of the lawnmower 4h. This prevents vibrations from the housing 50 from being transmitted to the battery pack BP. It also prevents vibrations from the main body 420 of the lawnmower 4h from being transmitted to the battery pack BP.

[0197] In one or more embodiments, the work machine includes a motor unit 2 and a working unit 4 to which the motor unit 2 is detachably attached and which receives power from the motor unit 2 to operate.

[0198] According to the above configuration, it is possible to realize a work machine in which vibrations of the housing 50 are less likely to be transmitted to the battery pack BP.

[0199] (Features related to the motor unit 202) In one or more embodiments, the motor unit 202 is detachably attached to each of a plurality of types of working units 4 and operates the working units 4. The motor unit 202 includes an output shaft 52 connected to the working unit 4, an electric motor 70 that rotates the output shaft 52, a housing 50 that accommodates the electric motor 70, a first battery mounting portion 54 that is disposed on the housing 50 and to which a battery pack BP (an example of a first battery) is detachably attached, a second battery mounting portion 204 that is disposed on the working unit 4 and to which a battery device BD (an example of a second battery) is detachably attached, an adapter 82 that is attached to the first battery mounting portion 54 in place of the battery pack BP, a cable 88 that extends from the adapter 82 and connects to the second battery mounting portion 204, and a control circuit board 74 that controls the output of the electric motor 70. When the battery pack BP is attached to the first battery mounting portion 54, power is supplied from the battery pack BP to the electric motor 70 via the first battery mounting portion 54. When the adapter 82 is attached to the first battery mounting portion 54 and the battery device BD is attached to the second battery mounting portion 204, power is supplied from the battery device BD to the electric motor 70 via the cable 88, the adapter 82, and the first battery mounting portion 54.

[0200] According to the above configuration, the battery device BD can be attached to the second battery attachment portion 204 arranged on the working unit 4. By attaching the battery device BD to the second battery attachment portion 204, it is possible to suppress transmission of vibrations of the housing 50 to the battery device BD, compared to when the battery device BD is attached on the housing 50.

[0201] In one or more embodiments, the motor unit 202 is detachably attached to each of a plurality of types of working units 4 and operates the working units 4. The motor unit 202 includes an output shaft 52 connected to the working unit 4, an electric motor 70 that rotates the output shaft 52, a housing 50 that houses the electric motor 70, a second battery attachment portion 204 (an example of a battery attachment portion) that is disposed on the working unit 4 and to which a battery device BD (an example of a battery) is detachably attached, a cable 88 that extends from the housing 50 and connects to the second battery attachment portion 204, and a control circuit board 74 that is disposed within the housing 50 and controls the output of the electric motor 70. When the battery device BD is attached to the second battery attachment portion 204, power is supplied from the battery device BD to the electric motor 70 via the cable 88.

[0202] According to the above configuration, the battery device BD can be attached to the second battery attachment portion 204 arranged on the working unit 4. By attaching the battery device BD to the second battery attachment portion 204, it is possible to suppress transmission of vibrations of the housing 50 to the battery device BD, compared to when the battery device BD is attached on the housing 50.

[0203] In one or more embodiments, the control circuit board 74 is disposed within the housing 50 .

[0204] A fan 72 for cooling the electric motor 70 is provided inside the housing 50. According to the above configuration, the cooling air generated by the fan 72 can cool the electric motor 70 as well as the control circuit board 74. Therefore, there is no need to separately mount a fan 72 for cooling the control circuit board 74 on the motor unit 202, and the configuration of the motor unit 202 can be simplified.

[0205] In one or more embodiments, the motor unit 202 further includes a lower abutment surface 66 (an example of a first surface) that is parallel to the axial direction of the output shaft 52, and a front abutment surface 58 (an example of a second surface) that is perpendicular to the axial direction of the output shaft 52. The motor unit 202 is fixed to the working unit 4 with at least one of the lower abutment surface 66 and the front abutment surface 58 abutting against the working unit 4.

[0206] According to the above configuration, the motor unit 202 can be attached to the working unit 4 in a number of positions (for example, a position in which the lower contact surface 66 is in contact with the working unit 4, or a position in which the front contact surface 58 is in contact with the working unit 4). As a result, the number of types of working units 4 to which the motor unit 202 can be attached can be increased.

[0207] In one or more embodiments, the working unit 4 includes a handle 10, 302, 322, 342, 362, 382, ​​422, 442 that includes a grip that can be held by a user. The second battery mounting portion 204 is disposed on the handle 10, 302, 322, 342, 362, 382, ​​422, 442.

[0208] According to the above configuration, the second battery mounting portion 204 is disposed on the handle 10, 302, 322, 342, 362, 382, ​​422, 442. The handle 10, 302, 322, 342, 362, 382, ​​422, 442 may be configured to reduce the transmission of vibrations from the main body of the working unit 4 so as not to cause discomfort to the user holding the grip. Therefore, by attaching the battery device BD to the second battery mounting portion 204, it is possible to prevent vibrations from being transmitted to the main body of the working unit 4. Furthermore, according to the above configuration, the second battery mounting portion 204 is disposed in a position that is easily reachable by the user. This allows the user to easily attach and detach the battery device BD to and from the second battery mounting portion 204.

[0209] In one or more embodiments, the second battery mounting portion 204 is disposed on the upper surface of the working unit 4 when the working unit 4 is in a working position.

[0210] According to the above configuration, the second battery attachment portion 204 is disposed in a position that is easily reachable by the user, which allows the user to easily attach and detach the battery device BD to and from the second battery attachment portion 204.

[0211] In one or more embodiments, the length of the cable 88 is in the range of 100 mm to 2000 mm.

[0212] The cable 88 extends between the first battery mounting portion 54 disposed on the housing 50 and the second battery mounting portion 204 disposed on the working unit 4. If the length of the cable 88 is excessively long compared to the distance between the first battery mounting portion 54 and the second battery mounting portion 204, the cable 88 may become excessively loose and interfere with work. The distance between the first battery mounting portion 54 and the second battery mounting portion 204 varies depending on the type of working unit 4, but is expected to be generally within a range of 50 mm to 1500 mm. With the above configuration, the length of the cable 88 can be set to a length slightly longer than the expected distance between the first battery mounting portion 54 and the second battery mounting portion 204. This prevents the cable 88 from becoming excessively loose, thereby preventing the cable 88 from interfering with work.

[0213] In one or more embodiments, the adapter 82 is removably attached to the first battery mounting portion 54 .

[0214] If the adapter 82 is non-detachably attached to the first battery attachment portion 54, the adapter 82 cannot be removed from the first battery attachment portion 54 thereafter. However, there are cases where it is desired to remove the adapter 82 from the first battery attachment portion 54 even after the adapter 82 has been attached to the first battery attachment portion 54. For example, there are cases where it is desired to attach a battery pack BP to the first battery attachment portion 54 instead of the adapter 82. According to the above configuration, the adapter 82 is detachably attached to the first battery attachment portion 54. As a result, even after the adapter 82 has been attached to the first battery attachment portion 54, the adapter 82 can be removed from the first battery attachment portion 54. As a result, the battery pack BP can be attached to the first battery attachment portion 54 instead of the adapter 82.

[0215] In one or more embodiments, the working unit 4 functions as a rammer 4a that compacts the ground. The working unit 4 includes a handle 10 that includes grips 20, 22, 24 that can be held by a user. A second battery mounting portion 204 is disposed on the handle 10.

[0216] According to the above configuration, the battery device BD can be attached to the handle 10 of the rammer 4a. This makes it possible to prevent vibrations from the housing 50 from being transmitted to the battery device BD. Also, it makes it possible to prevent vibrations from the working part 6 of the rammer 4a (an example of the main body of the rammer) from being transmitted to the battery device BD.

[0217] In one or more embodiments, the working unit 4 functions as a plate compactor 4b that compacts the ground. The working unit 4 includes a handle 302 that includes a grip 304 that can be held by a user. The second battery mounting portion 204 is disposed on the handle 302.

[0218] According to the above configuration, the battery device BD can be attached to the handle 302 of the plate compactor 4b. This makes it possible to suppress the vibration of the housing 50 from being transmitted to the battery device BD. Also, it is possible to suppress the vibration of the main body 300 of the plate compactor 4b from being transmitted to the battery device BD.

[0219] In one or more embodiments, the working unit 4 functions as a trowel 4c for leveling the surface of concrete. The working unit 4 includes a handle 322 that includes a grip 324 that can be held by a user. The second battery mounting portion 204 is disposed on the handle 322.

[0220] According to the above configuration, the battery device BD can be attached to the handle 322 of the trowel 4c. This makes it possible to prevent vibrations from the housing 50 from being transmitted to the battery device BD. Also, it makes it possible to prevent vibrations from the main body 320 of the trowel 4c from being transmitted to the battery device BD.

[0221] In one or more embodiments, the operational unit 4 functions as a concrete mixer 4d for mixing concrete. The operational unit 4 includes a handle 342 including a grip 344 that can be held by a user. The second battery mounting portion 204 is disposed on the handle 342.

[0222] According to the above configuration, the battery device BD can be attached to the handle 342 of the concrete mixer 4d. This makes it possible to suppress transmission of vibrations of the housing 50 to the battery device BD. Also, it is possible to suppress transmission of vibrations of the main body 340 of the concrete mixer 4d to the battery device BD.

[0223] In one or more embodiments, the working unit 4 functions as a concrete saw 4e for cutting into concrete. The working unit 4 includes a handle 362 including a user-graspable grip 364. The second battery mounting portion 204 is disposed on the handle 362.

[0224] According to the above configuration, the battery device BD can be attached to the handle 362 of the concrete saw 4e. This makes it possible to suppress transmission of vibrations of the housing 50 to the battery device BD. Also, it makes it possible to suppress transmission of vibrations of the main body 360 of the concrete saw 4e to the battery device BD.

[0225] In one or more embodiments, the working unit 4 functions as a high-pressure washer 4f (or sprayer 4g) (an example of a sprayer) that pressurizes and sprays liquid. The second battery mounting portion 204 is disposed on the upper surface of the working unit 4 when the working unit 4 is in a working position.

[0226] According to the above configuration, the battery device BD can be attached to the upper surface of the high-pressure washer 4f (or the sprayer 4g), thereby suppressing the vibration of the housing 50 from being transmitted to the battery device BD.

[0227] In one or more embodiments, the working unit 4 functions as a lawn mower 4h. The working unit 4 includes a handle 422 including a grip 424 that can be held by a user. The second battery mounting portion 204 is disposed on the handle 422.

[0228] According to the above configuration, the battery device BD can be attached to the handle 422 of the lawnmower 4h. This makes it possible to prevent vibrations from the housing 50 from being transmitted to the battery device BD. It also makes it possible to prevent vibrations from the main body 420 of the lawnmower 4h from being transmitted to the battery device BD.

[0229] In one or more embodiments, the work machine includes a motor unit 202 and a working unit 4 to which the motor unit 202 is detachably attached and which receives power from the motor unit 202 to operate.

[0230] According to the above configuration, it is possible to realize a work machine in which vibrations of the housing 50 are not easily transmitted to the battery device BD. [Explanation of symbols]

[0231] 2: motor unit, 4: working unit, 4a: rammer, 4b: plate compactor, 4c: trowel, 4d: concrete mixer, 4e: concrete saw, 4f: high-pressure washer, 4g: sprayer, 4h: lawn mower, 4i: compaction roller, 6: working part, 8: upper housing, 10: handle, 12: mounting base, 14: opening, 16: telescopic part, 18: leveling board, 20: first grip, 22: second grip, 24: third grip, 30: battery housing, 32: slit, 34: hook, 36: guide rail, 38: engagement part, 40: operating part, 42: guide groove, 44 : Engagement groove, 46: Connection terminal, 50: Housing, 52: Output shaft, 54: First battery mounting portion, 56: Front mounting portion, 58: Front contact surface, 60: Screw hole, 62: Through hole, 64: Lower mounting portion, 66: Lower contact surface, 68: Screw hole, 70: Electric motor, 72: Fan, 74: Control circuit board, 76: Bearing, 78: Rotor, 80: Stator, 81: Bracket, 82: Adapter, 84: Hook, 86: Joint, 88: Cable, 88m: Intermediate portion, 90 (90a, 90b, 90c, 90d, 90e, 90f, 90g, 90h, 90i): Second battery mounting part, 92: base part, 94: main body part, 96: cover part, 98: front cover, 100: rear cover, 102: latch receiver, 104: latch, 106: left side protrusion, 108: left side fitting part, 110: right side protrusion, 112: right side fitting part, 114: plate part, 116: main power switch, 118: operation switch, 120: rotation speed adjustment switch, 202: motor unit, 204 (204a, 204b, 204c, 204d, 204e, 204f, 204g, 204h, 204i): second battery mounting part, 206: base part, 208: main body part, 210: left side fitting part, 212 : Right side mating part, 214: Plate part, 216: Claw receiving part, 218: Latch receiving part, 252: Battery housing, 254: Handle, 256: Main power switch, 258: Charging connector, 260: Engagement claw, 262: Latch, 300: Main body, 302: Handle, 304: Grip, 306: Support, 308: Mounting base, 310: Leveling board, 320: Main body, 322: Handle, 324: Grip, 326: Support, 328: Mounting base, 330: Blade, 340: Main body, 342: Handle, 344: Grip, 346: Support, 348: Mounting base, 350: Rotating drum, 352: Wheel,354: Cart, 360: Main body, 362: Handle, 364: Grip, 366: Support, 368: Mounting base, 370: Rotary blade, 372: Wheel, 374: Cart, 380: Main body, 382: Handle, 384: Grip, 386: Support, 388: Pump, 390: Wheel, 392: Cart, 394: Mounting base, 400: Pump, 402: Hose, 404: Reel, 406: Frame, 408: Mounting base, 420: Main body, 422: Handle, 424: Grip, 426: Support, 428: Mounting base, 430: Reel blade, 432: Wheel, 434: Housing, 440: Main body, 442: Handle, 444: Grip, 446: Support, 448: Mounting base, 450: Roller,

Claims

1. A motor unit that is detachably attached to each of a plurality of types of working units and operates the working units, an output shaft coupled to the working unit; an electric motor that rotates the output shaft; a housing that accommodates the electric motor; a first battery mounting portion disposed on the housing, to which a first battery is detachably attached; a second battery mounting portion disposed on the working unit, to which a second battery is detachably attached; an adapter attached to the first battery attachment portion in place of the first battery; a cable extending from the adapter and connecting to either the second battery mounting portion or the second battery; a control circuit board for controlling the output of the electric motor, When the first battery is attached to the first battery attachment portion, electric power is supplied from the first battery to the electric motor via the first battery attachment portion, A motor unit in which, when the adapter is attached to the first battery mounting portion and the second battery is attached to the second battery mounting portion, power is supplied from the second battery to the electric motor via the cable, the adapter, and the first battery mounting portion.

2. The motor unit of claim 1 , wherein the control circuit board is disposed within the housing.

3. The motor unit includes: a first surface parallel to the axial direction of the output shaft; a second surface perpendicular to the axial direction of the output shaft, The motor unit according to claim 1 or 2, wherein the motor unit is fixed to the working unit with at least one of the first surface and the second surface in contact with the working unit.

4. A motor unit according to any one of claims 1 to 3, wherein at least one of the first battery and the second battery can be removed from the motor unit and attached to an electrical device other than the motor unit, thereby supplying power to the electrical device.

5. the second battery includes a battery pack; The motor unit according to claim 1 , wherein a plurality of the battery packs are attached to the second battery attachment portion.

6. the second battery includes a battery pack; The motor unit according to claim 1 , further comprising a cover that covers the battery pack attached to the second battery attachment portion.

7. the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

8. The motor unit according to claim 1 , wherein the second battery attachment portion is disposed on an upper surface of the working unit when the working unit is in a working position.

9. The motor unit according to claim 1 , wherein the first battery mounting portion and the second battery mounting portion each include a common member having a common shape.

10. 10. The motor unit according to claim 1, wherein the length of the cable is in the range of 100 mm to 2000 mm.

11. The motor unit according to claim 1 , wherein the adapter is detachably attached to the first battery attachment portion.

12. The working unit functions as a rammer to compact the ground; the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

13. The working unit functions as a plate compactor for compacting the ground; the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

14. The working unit functions as a trowel to level the surface of the concrete; the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

15. The working unit functions as a concrete mixer for mixing concrete, the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

16. The working unit functions as a concrete saw for cutting into concrete; the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

17. The working unit functions as an injector that pressurizes and injects liquid, The motor unit according to claim 1 , wherein the second battery attachment portion is disposed on an upper surface of the working unit when the working unit is in a working position.

18. The working unit functions as a lawnmower; the working unit is provided with a handle including a grip that can be grasped by a user; The motor unit according to claim 1 , wherein the second battery mounting portion is disposed on the handle.

19. A motor unit according to any one of claims 1 to 18; a working unit to which the motor unit is detachably attached and which operates by receiving power from the motor unit;

20. A motor unit that is detachably attached to each of a plurality of types of working units and operates the working units, an output shaft coupled to the working unit; an electric motor that rotates the output shaft; a housing that accommodates the electric motor; a battery mounting portion disposed on the working unit, to which a battery is detachably attached; a cable extending from the housing and connecting to either the battery mounting portion or the battery; a control circuit board disposed within the housing and controlling the output of the electric motor, When the battery is attached to the battery attachment portion, power is supplied from the battery to the electric motor via the cable.

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