Motor unit and work machine including the same

Abstract

To provide a motor unit which can be used in a low output type work unit.SOLUTION: A motor unit causes a work unit to operate. The motor unit includes: a body housing which includes a first housing and a second housing and in which a housing space is defined between the first housing and the second housing and the first housing and the second housing define an entire outer shape of the body housing; a motor which is disposed in the housing space; an output unit which can be fixed to the work unit and causes the work unit to operate when the motor operates; a battery terminal which is exposed to the outside of the body housing and can be connected to the battery for supplying electric power to the motor; and a control unit which is disposed in the housing space and controls the motor.SELECTED DRAWING: Figure 12

Description

[Technical field]

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

[0002] Patent Document 1 discloses a motor unit. The motor unit operates a working unit. The motor unit includes a main housing having an internal storage section, a motor arranged in the storage space, an output unit that can be attached to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the storage space and controls the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 131007 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above motor unit, the main housing has four housings that support a large motor from multiple directions with separate members. Since the motor is a heavy, high-output motor, the motor unit is used in a high-output work unit. Recently, there has been a demand for motor units that can be used in low-output work units. The present specification aims to provide a motor unit that can be used in a low-output work unit. [Means for solving the problem]

[0005] This specification discloses a motor unit. The motor unit operates a working unit. The motor unit includes a main housing having a first housing and a second housing, an accommodation space being defined between the first housing and the second housing, and the first housing and the second housing define the overall external shape of the main housing, a motor arranged in the accommodation space, an output unit that can be fixed to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the accommodation space and controls the motor.

[0006] According to the above configuration, the outer shape of the main body housing is defined by the two housings, the first housing and the second housing. The two housings are used when the motor is a low-power motor that is lighter than a high-power motor. Therefore, the motor unit can be used for a low-power working unit.

[0007] This specification also discloses a motor unit. The motor unit operates a working unit. The motor unit includes a main body housing having an accommodation space therein, a motor arranged in the accommodation space, an output unit that can be fixed to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main body housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the accommodation space and controls the motor. The maximum output value of the motor is 0.5 kW to 1.5 kW.

[0008] According to the above configuration, a motor having a maximum output value of 0.5 kW to 2.0 kW, for example, a motor having a maximum output value of 0.5 kW to 1.5 kW, is usually used to operate a low-output type working unit, and therefore the motor unit can be used for the low-output type working unit.

[0009] This specification also discloses a motor unit. The motor unit operates a working unit. The motor unit includes a main housing having an internal storage space, a motor arranged in the storage space, an output unit that can be fixed to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the storage space and controls the motor. The maximum output value of the motor is 0.5 kW to 2.0 kW. The torque of the motor is 1.5 N·m to 3.0 N·m. The rotation speed of the motor is 4000 rpm to 10000 rpm.

[0010] According to the above configuration, a motor having a maximum output value of 0.5 kW to 2.0 kW is usually used to operate a low-output type working unit, so the motor unit can be used for the low-output type working unit.

[0011] This specification also discloses a working machine. The working machine includes a working unit and a motor unit that operates the working unit. The motor unit includes a main body housing having a first housing and a second housing, with an accommodation space being defined between the first housing and the second housing, and the first housing and the second housing defining the overall external shape of the main body housing, a motor arranged in the accommodation space, an output unit that can be fixed to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main body housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the accommodation space and controls the motor.

[0012] According to the above configuration, it is possible to achieve the same effects as the above motor unit. [Brief description of the drawings]

[0013] [Figure 1] 1 shows a system 2 according to a first embodiment. [Diagram 2] 1 is an example showing a method for manufacturing the working machine 8 of the first embodiment. [Diagram 3] 1 is an example showing a method for manufacturing the working machine 8 of the first embodiment. [Figure 4] 1 is an example showing a method for manufacturing the working machine 8 of the first embodiment. [Diagram 5] 1 is an example showing a method for manufacturing the working machine 8 of the first embodiment. [Figure 6] 1 is an example showing a method for manufacturing the working machine 8 of the first embodiment. [Figure 7] FIG. 2 is a perspective view of a motor unit 4 and a battery pack BP according to the first embodiment. [Figure 8] FIG. 2 is a perspective view of a motor unit 4 and a battery pack BP according to the first embodiment. [Figure 9] FIG. 4 is a diagram showing parameters of the motor unit 4 of the first embodiment. [Figure 10] FIG. 2 is a perspective view of the motor unit 4 with the battery pack BP removed in the first embodiment. [Figure 11] 2 is a cross-sectional view of the motor unit 4 in the vicinity of a battery terminal 108 in the first embodiment. [Figure 12] 3 is a cross-sectional view of the motor unit 4 in the vicinity of the main power switch 35 in the first embodiment. FIG. [Figure 13] FIG. 2 is a perspective view of a battery pack BP according to the first embodiment. [Figure 14] FIG. 4 is a diagram showing parameters of a motor 112 and a battery pack BP in the first embodiment. [Figure 15] FIG. 2 is a left side view of the motor unit 4 near the battery pack BP in the first embodiment. [Figure 16] FIG. 2 is a left side view of the motor unit 4 and the battery pack BP of the first embodiment. [Figure 17] 4 is a rear cross-sectional view of the motor unit 4 of the first embodiment. FIG. [Figure 18] 2 is a cross-sectional view of the motor unit 4 and the battery pack BP of the first embodiment. FIG. [Figure 19]FIG. 2 is an exploded perspective view of the motor unit 4 according to the first embodiment. [Figure 20] 1 is a perspective view of the motor unit 4 from which the left main body housing 16 has been removed, as viewed from the lower rear left side in the first embodiment. [Figure 21] FIG. 2 is a perspective view of a right main body housing 14 of the first embodiment. [Figure 22] FIG. 2 is a perspective view of the left main body housing 16 of the first embodiment. [Figure 23] FIG. 2 is an exploded perspective view of a motor housing 110, a motor 112, and an output unit 116 according to the first embodiment. [Figure 24] 2 is a cross-sectional perspective view of the motor unit 4 in the vicinity of the motor 112 in the first embodiment. FIG. [Diagram 25] 2 is a cross-sectional perspective view of the motor unit 4 in the vicinity of the rear end of the motor housing 110 in the first embodiment. FIG. [Figure 26] 1 is a rear cross-sectional view of the motor unit 4 in the vicinity of a right support portion 137a and a left support portion 138a in the first embodiment. [Figure 27] 11 is a rear cross-sectional view of the motor unit 4 in the vicinity of a first right pin 137f and a first left pin 138f in the first embodiment. FIG. [Figure 28] FIG. 1 is a cross-sectional view of a motor unit 4 according to a first embodiment; [Figure 29] 2 is a rear cross-sectional view of the motor unit 4 near the cooling fan 114 in the first embodiment. FIG. [Diagram 30] FIG. 2 is an exploded perspective view of a motor housing 110, a motor 112, and an output unit 116 according to the first embodiment. [Diagram 31] 11 is a front cross-sectional view of the motor unit 4 in the vicinity of a second right pin 137g and a second left pin 138g in the first embodiment. FIG. [Diagram 32] 11 is a horizontal cross-sectional view of the motor unit 4 in the vicinity of a right retaining portion 137d and a left retaining portion 138d in the first embodiment. FIG. [Diagram 33] 3 is a cross-sectional view of the motor unit 4 in the vicinity of a second screw boss portion 191 in the first embodiment. FIG. [Diagram 34]2 is a front cross-sectional view of the motor unit 4 near a clutch spring 180 in the first embodiment. FIG. [Diagram 35] FIG. 2 is a perspective view of a motor unit 4 equipped with a spindle 208 and a battery pack BP in the first embodiment. [Diagram 36] 2 is a cross-sectional view of the motor unit 4 in the vicinity of the spindle 208 in the first embodiment. [Figure 37] FIG. 2 is a side view of the motor unit 4 and the handheld brush cutter 6i of the first embodiment. [Figure 38] FIG. 2 is a side view of the motor unit 4 and the cultivator 6k of the first embodiment. [Figure 39] FIG. 2 is a side view of the motor unit 4 and winch 6a of the first embodiment. [Diagram 40] FIG. 2 is a side view of the motor unit 4 and the slope grass mower 6c of the first embodiment. [Diagram 41] FIG. 2 is an exploded perspective view of the motor unit 4 and the handheld brush cutter 6i of the first embodiment. [Diagram 42] 1 is a cross-sectional view of a first output portion 212, a fixed unit 234, and a transmission shaft 236 in the first embodiment. [Diagram 43] FIG. 2 is a side view of the motor unit 4 and the handheld brush cutter 6i in the vicinity of the motor unit 4 in the first embodiment. [Diagram 44] FIG. 1 is a side view of a motor unit 4 and a brush cutter 6d in which a backpack battery 280 of the first embodiment is used. [Diagram 45] FIG. 2 is a perspective view of a motor unit 4 in which a backpack-type battery 280 of the first embodiment is used. [Figure 46] FIG. 2 is a top view of the motor unit 4 and the cultivator 6k of the first embodiment. [Figure 47] FIG. 2 is a side view of the motor unit 4 and the cultivator 6k of the first embodiment. [Figure 48] 3 is a cross-sectional view of the motor unit 4 and the working unit 6 in the vicinity of a first coupler 350 in the first embodiment. FIG. [Figure 49] 1 is a cross-sectional view of the motor unit 4 and the working unit 6 in the vicinity of a second coupler 360 in the first embodiment. FIG. [Figure 50] 11 is a cross-sectional view of a motor unit 4 and a battery pack BP according to a second embodiment. FIG. [Figure 51] FIG. 11 is a perspective view of a motor unit 4 and a battery pack BP according to a third embodiment. [Figure 52] FIG. 11 is a perspective view of a motor unit 4 according to a third embodiment. [Figure 53] 13 is a cross-sectional view of a motor unit 4 and a battery pack BP according to a third embodiment. FIG. [Figure 54] FIG. 13 is a perspective view of a motor unit 4 and a battery pack BP according to a fourth embodiment. [Figure 55] FIG. 13 is a perspective view of a motor unit 4 according to a fourth embodiment. [Figure 56] 13 is a cross-sectional view of a motor unit 4 and a battery pack BP according to a fourth embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Representative and non-limiting examples of the present invention will be 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 the preferred examples of the present invention, and is not intended to limit the scope of the present invention. In addition, 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, and methods of manufacturing and using the same.

[0015] In addition, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, but are specifically described only to illustrate representative embodiments of the present invention. Furthermore, the various features of the following representative embodiments and the various features described in the claims do not have to be combined in the exact manner of the embodiments described herein or in the order listed in order to provide additional and useful embodiments of the present invention.

[0016] All features described in the 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.

[0017] This specification discloses a motor unit. The motor unit operates a working unit. The motor unit includes a main housing having a first housing and a second housing, an accommodation space being defined between the first housing and the second housing, and the first housing and the second housing define the overall external shape of the main housing, a motor arranged in the accommodation space, an output unit that can be fixed to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the accommodation space and controls the motor.

[0018] In one or more embodiments, the motor unit may further include a motor housing that accommodates the motor and is disposed in the accommodation space. Each of the motor housing, the battery terminal, and the control unit may be sandwiched between the first housing and the second housing.

[0019] According to the above configuration, it is not necessary to install additional components for supporting the motor housing, the battery terminals and the control unit.

[0020] In one or more embodiments, the motor may be disposed between the battery terminals and the control unit.

[0021] According to the above configuration, the space between the battery terminal and the control unit can be effectively utilized.

[0022] In one or more embodiments, the motor may include a motor shaft extending in a fore-aft direction. The motor may be disposed forward of a fore-aft center of the control unit and a fore-aft center of the battery terminals.

[0023] According to the above configuration, the wiring can be arranged in the space behind the motor and between the battery terminal and the control unit.

[0024] In one or more embodiments, the center of gravity of the motor unit may be located within the motor.

[0025] According to the above configuration, tilting of the motor unit caused by vibration of the motor can be suppressed.

[0026] In one or more embodiments, the motor may have a diameter of 100 mm or less.

[0027] According to the above configuration, the motor unit can be made smaller by making the motor smaller.

[0028] In one or more embodiments, the motor may include a motor shaft extending in a front-to-rear direction. The length of the body housing in the front-to-rear direction may be greater than or equal to 1.5 times and less than or equal to 2.0 times the length of the motor in the front-to-rear direction.

[0029] According to the above configuration, the motor unit can be made smaller.

[0030] In one or more embodiments, the motor unit may further include a cooling fan disposed in the accommodation space and rotating together with the motor. The main housing may have an intake port and an exhaust port communicating between the accommodation space and the outside of the main housing.

[0031] According to the above configuration, it is possible to cool the motor, the battery terminals, and the control unit, which are heat-generating components.

[0032] In one or more embodiments, the motor unit may further include a motor housing that accommodates the motor and is disposed in the accommodation space. The motor housing may have a motor air inlet disposed between the battery terminal and the control unit.

[0033] According to the above configuration, the battery terminals and the control unit can be cooled simultaneously by the air flowing toward the motor intake port, which shortens the cooling path compared to a configuration in which the battery terminals and the control unit are cooled separately.

[0034] In one or more embodiments, the main body housing may include a lower wall that contacts the reference surface when the motor unit is placed on the reference surface, and an upper wall opposite the lower wall and on which the battery terminals are located.

[0035] The motor unit may be used, for example, in rainy weather. Therefore, the reference surface may be wet with liquid, for example, rainwater. With the above configuration, it is possible to prevent rainwater on the reference surface from coming into contact with the battery terminal.

[0036] In one or more embodiments, when the motor unit is placed on the reference surface, the upper surface of the upper wall may be inclined with respect to the reference surface. When the motor unit is placed on the reference surface, the battery may be connected to the battery terminal when the motor unit slides on the upper surface in a direction away from the reference surface, and may be disconnected from the battery terminal when the motor unit slides on the upper surface in a direction toward the reference surface.

[0037] The motor unit may be used, for example, in rainy weather. According to the above configuration, even if liquid, for example, rainwater, hits the upper wall of the upper wall, the rainwater on the upper surface of the upper wall can be easily guided toward the reference plane.

[0038] In one or more embodiments, when the motor unit is placed on a reference surface, the inclination angle of the upper surface of the upper wall with respect to the reference surface may be greater than or equal to 5 degrees and less than or equal to 45 degrees.

[0039] According to the above configuration, the liquid on the upper surface of the upper wall can be more easily guided toward the reference surface.

[0040] In one or more embodiments, the body housing may be made from a resin material.

[0041] According to the above configuration, the weight of the motor unit can be reduced compared to a configuration in which the main body housing is made of a metal material.

[0042] This specification also discloses a motor unit. The motor unit operates a working unit. The motor unit includes a main body housing having an accommodation space therein, a motor arranged in the accommodation space, an output unit that can be fixed to the working unit and operates the working unit when the motor operates, a battery terminal that is exposed to the outside of the main body housing and can be connected to a battery that supplies power to the motor, and a control unit that is arranged in the accommodation space and controls the motor. The maximum output value of the motor is 0.5 kW to 1.5 kW.

[0043] In one or more embodiments, the motor unit may weigh less than 7.5 kg.

[0044] Generally, the higher the maximum output value of a motor, the heavier the motor becomes. With the above configuration, the weight of the motor unit can be reduced compared to when a high-output motor is used. This allows the weight of the working unit to which the motor unit is attached to be reduced.

[0045] In one or more embodiments, the volume of the body housing is greater than or equal to 13,000 cm 3 It may be the following.

[0046] Generally, the higher the maximum output value of a motor, the larger the motor becomes. Accordingly, the main body housing also becomes larger. With the above configuration, the main body housing can be made smaller than when a high-output motor is used. This allows the motor unit to be made smaller.

[0047] (First embodiment) As shown in FIG. 1, the system 2 includes a motor unit 4 and a plurality of working units 6. The motor unit 4 can be selectively fixed to the working unit 6. The working unit 6 can also be fixed to the engine unit in addition to the motor unit 4. The engine unit is, for example, the engine unit of EH035 sold by Makita Corporation or the engine unit of GX35 sold by Honda R&D Co., Ltd. That is, the working unit 6 can be applied to both the motor unit 4 and the engine unit. The plurality of working units 6 include, for example, a winch 6a, a slope grass cutter 6c, a brush cutter 6d using a backpack battery 280 (see FIG. 44), a screed 6e, a trowel 6f, a rammer 6g, a plate compactor 6h, a handheld brush cutter 6i, an edger 6j, and a cultivator 6k. The working unit 6 is not limited to the above working unit 6, and may be a working unit 6 other than the above working unit 6. Each working unit 6 is a low-output type working unit. The combination of the motor unit 4 and the working unit 6 is selected by the manufacturer or the user. Hereinafter, the configuration in which the motor unit 4 is fixed to the working unit 6 may be referred to as a working machine 8. A user uses the working machine 8 to perform work.

[0048] The working machine 8 is manufactured in various ways. For example, as shown in Fig. 2, when a manufacturer selects a combination of a motor unit 4 and a working unit 6, the manufacturer prepares multiple types of working units 6 and combines each working unit 6 with a motor unit 4. In this way, the working machine 8 is manufactured.

[0049] In another example, as shown in Fig. 3, a first manufacturer manufactures a motor unit 4. Other manufacturers, for example, a second manufacturer and a third manufacturer, purchase the motor unit 4 from the first manufacturer. The second manufacturer combines the purchased motor unit 4 with a prepared working unit 6. The third manufacturer combines the purchased motor unit 4 with a prepared working unit 6. In this way, a working machine 8 is produced for each manufacturer.

[0050] In another example, as shown in FIG. 4, a first manufacturer manufactures a motor unit 4. A second manufacturer manufactures a working unit 6. A third manufacturer purchases the motor unit 4 from the first manufacturer and purchases the working unit 6 from the second manufacturer. The third manufacturer combines the purchased motor unit 4 and working unit 6. In this way, a working machine 8 is manufactured.

[0051] 5, a user has a motor unit 4 and multiple types of working units 6. The user changes the combination of the motor unit 4 and the working unit 6 for each desired task.

[0052] In another example, as shown in FIG. 6, a user owns a work machine 8. A dealer sells multiple types of working units 6. The user purchases a desired working unit 6 at the dealer. The dealer combines the motor unit 4 of the work machine 8 owned by the user with the purchased working unit 6. In this way, the work machine 8 is manufactured.

[0053] As shown in Figs. 7 and 8, the motor unit 4 operates by power from a battery pack BP. In this embodiment, the battery pack BP shown in Figs. 7 and 8 may be referred to as a battery pack BP1. Hereinafter, the direction in which a motor shaft 158 ​​of a motor 112 described later extends is referred to as a front-rear direction, the direction perpendicular to the front-rear direction is referred to as a left-right direction, and the direction perpendicular to the front-rear direction and the left-right direction is referred to as a top-down direction. The front-rear direction, the left-right direction, and the top-down direction are defined to explain the detailed configuration of the motor unit 4. In a work machine 8 in which the motor unit 4 and the work unit 6 are combined, the front-rear direction, the left-right direction, and the top-down direction of the work machine 8 may differ from the front-rear direction, the left-right direction, and the top-down direction of the motor unit 4.

[0054] As shown in FIG. 9, the motor unit 4 including the battery pack BP has a weight of 3.0 kg or more and 7.5 kg or less. The length of the motor unit 4 in the front-rear direction is 175 mm or more and 250 mm or less. The length of the motor unit 4 in the left-right direction is 105 mm or more and 240 mm or less. The length of the motor unit 4 in the up-down direction is 225 mm or more and 280 mm or less. The volume of the motor unit 4 is 4000 cm 3 Above 13000cm 3 In this embodiment, the length of the motor unit 4 in the left-right direction is 120 mm. The length of the motor unit 4 in the left-right direction may be, for example, 150 mm or less.

[0055] The weight of the motor unit 4 not including the battery pack BP is 2.0 kg or more and 3.5 kg or less. The length of the motor unit 4 in the front-rear direction is 175 mm or more and 210 mm or less. The length of the motor unit 4 in the left-right direction is 105 mm or more and 240 mm or less. The length of the motor unit 4 in the up-down direction is 180 mm or more and 190 mm or less. The volume of the motor unit 4 is 3000 cm 3 More than 10000cm 3 The following is the result.

[0056] As shown in Figs. 7 and 8, the motor unit 4 includes a main body housing 12. The main body housing 12 is made of, for example, a resin material. As shown in Fig. 9, the weight of the main body housing 12 is 0.8 kg or more and 1.2 kg or less. The length of the main body housing 12 in the front-rear direction is 175 mm or more and 210 mm or less. The length of the main body housing 12 in the left-right direction is 105 mm or more and 240 mm or less. The length of the main body housing 12 in the up-down direction is 180 mm or more and 190 mm or less. The volume of the main body housing 12 is 3000 cm 3 More than 10000cm 3 The following is the result.

[0057] As shown in Figs. 7 and 8, the main body housing 12 includes a right main body housing 14 and a left main body housing 16. The right main body housing 14 defines the outer shape of the right half of the main body housing 12. The left main body housing 16 defines the outer shape of the left half of the main body housing 12. Each of the right main body housing 14 and the left main body housing 16 has a shape obtained by dividing the main body housing 12 in half on a plane including the front-rear direction and the up-down direction. The boundary between the right main body housing 14 and the left main body housing 16 is located at the center of the main body housing 12 in the left-right direction. The right main body housing 14 and the left main body housing 16 define the entire outer shape of the main body housing 12. An accommodation space 17 (see Fig. 17) is defined between the right main body housing 14 and the left main body housing 16.

[0058] The right body housing 14 and the left body housing 16 are fixed together using four screws 18a. The screws 18a are inserted into screw holes 18b formed in the right body housing 14 and screw into screw bosses (not shown) formed in the left body housing 16. In this embodiment, the distance between adjacent screw holes 18b in the front-to-rear direction and the distance between adjacent screw holes 18b in the up-down direction are both 70.7 mm.

[0059] The main body housing 12 includes a right wall 20, a left wall 22, a lower wall 24, a rear upper wall 26 (see FIG. 10), a front upper wall 28, a rear wall 30, a front vertical wall 32, and a front horizontal wall 34. In the left-right direction, the lower wall 24, the rear upper wall 26, the front upper wall 28, the rear wall 30, the front vertical wall 32, and the front horizontal wall 34 are disposed between the right wall 20 and the left wall 22. The lower wall 24 comes into contact with a reference plane P (see FIG. 17) when the motor unit 4 is placed on the reference plane P. The lower wall 24 is inclined with respect to a plane including the left-right direction and the front-rear direction.

[0060] As shown in FIG. 10, the rear upper wall 26 is disposed on the opposite side to the lower wall 24. The rear upper wall 26 extends from the front end toward the rear lower side. As shown in FIG. 11, the rear upper wall 26 is inclined with respect to a plane P1 including the left-right direction and the front-rear direction. The inclination angle A of the upper surface 26a of the rear upper wall 26 with respect to the plane P1 is 5 degrees or more and 45 degrees or less. The rear upper wall 26 is also inclined with respect to the lower wall 24 (see FIG. 7), i.e., the reference plane P (see FIG. 17). The inclination angle B of the upper surface 26a of the rear upper wall 26 with respect to the reference plane P is 5 degrees or more and 45 degrees or less. As a result, the liquid on the rear upper wall 26 flows over the rear upper wall 26 and falls onto the reference plane P. In FIG. 11, a plane parallel to the reference plane P is illustrated by a dashed line.

[0061] As shown in Fig. 10, the front upper wall 28 is disposed in front of the rear upper wall 26. As shown in Fig. 7 and Fig. 8, the front upper wall 28 is disposed along a plane P1 (see Fig. 11) that includes the left-right direction and the front-rear direction. A main power switch 35 is disposed on the front upper wall 28.

[0062] As shown in FIG. 12, the main power switch 35 includes a base 35a, an operation button 35b, a display window 35c, a circuit board 35d, a switch 35e, and an LED 35f. The base 35a is supported by the main body housing 12 by being sandwiched between the right main body housing 14 and the left main body housing 16 (see FIG. 7). The base 35a is made of, for example, a resin material. The operation button 35b and the display window 35c are disposed on the base 35a. The operation button 35b receives a user's operation to switch the motor unit 4 between an on state and an off state. The circuit board 35d is fixed to the base 35a from the underside thereof by a screw 35g. The switch 35e and the LED 35f are disposed on the upper surface of the circuit board 35d. The switch 35e is disposed directly below the operation button 35b. When the operation button 35b is pressed, the switch 35e is pressed by the operation button 35b. This switches between an on state and an off state of the motor unit 4. The LED 35f is disposed directly below the display window 35c. The LED 35f is turned on when the motor unit 4 is in the on state. The lighting of the LED 35f is visually recognized by a user through the display window 35c.

[0063] As shown in Fig. 8, the front vertical wall 32 extends upward from the front end of the lower wall 24. The front horizontal wall 34 extends forward from the upper end of the front vertical wall 32. The front horizontal wall 34 is disposed on the opposite side of the front upper wall 28. The front horizontal wall 34 has a through hole 36 that passes through the front horizontal wall 34 in the up-down direction. The through hole 36 is disposed across the right main body housing 14 and the left main body housing 16.

[0064] As shown in FIG. 10, the main body housing 12 has two screw holes 37. The two screw holes 37 are arranged near the lower end of the rear wall 30. The screw holes 37 penetrate the rear wall 30 in the front-rear direction. One screw hole 37 is arranged in the right main body housing 14. The other screw hole 37 is arranged in the left main body housing 16. The screw holes 37 can be screwed into screws 354 (see FIG. 48). The main body housing 12 is configured to be fixed to the working unit 6 (see FIG. 1) via the screw holes 37 and the screws 354.

[0065] The main housing 12 further includes a right rail 38, a left rail 40, and a connecting wall 42. The right rail 38 and the left rail 40 are disposed on the rear upper wall 26. The right rail 38 extends above the right end of the rear upper wall 26 from the rear end of the rear upper wall 26 toward the front end. The left rail 40 extends above the left end of the rear upper wall 26 from the rear end of the rear upper wall 26 toward the front end. The left rail 40 faces the right rail 38 in the left-right direction. The connecting wall 42 connects the front end of the right rail 38 to the front end of the left rail 40. The connecting wall 42 is connected to the rear end of the front upper wall 28. The connecting wall 42 is spaced apart from the front end of the rear upper wall 26. Therefore, an opening 43 is formed between the connecting wall 42 and the front end of the rear upper wall 26. The opening 43 communicates the accommodation space 17 (see FIG. 17 ) of the main housing 12 with the space outside the main housing 12.

[0066] The right rail 38 includes a right rail base 44 extending upward from above the upper rear wall 26, and a right rail claw 46 protruding leftward from the upper end of the right rail base 44. The left rail 40 includes a left rail base 48 extending upward from the upper rear wall 26, and a left rail claw 50 protruding rightward from the upper end of the left rail base 48. The right rail claw 46 and the left rail claw 50 function as rails for attaching the battery pack BP (see FIG. 13) to the main housing 12.

[0067] First, the battery pack BP shown in FIG. 13 will be described. The battery pack BP includes a chargeable and dischargeable secondary battery, for example, a lithium ion battery. As shown in FIG. 9, the weight of the battery pack BP is 0.6 kg or more and 2.0 kg or less. The length of the battery pack BP in the front-rear direction is 115 mm or more and 155 mm or less. The length of the battery pack BP in the left-right direction is 75 mm or more and 85 mm or less. The length of the battery pack BP in the up-down direction is 65 mm or more and 115 mm or less. The volume of the battery pack BP is 500 cm 3 Above 1500cm 3 The following is the result.

[0068] As shown in FIG. 14, the maximum voltage value of the battery pack BP is 20V or more and 100V or less. The maximum voltage value of the battery pack BP may be 40V or more and 80V or less. The rated capacity of the battery pack BP is 1.5Ah or more and 18Ah or less. In the battery pack BP shown in FIG. 7 and FIG. 8, that is, the battery pack BP1, the maximum voltage value may be 40V and the rated capacity may be, for example, 8.0Ah. In the battery pack BP, the maximum voltage value may be 40V and the rated capacity may be 2.5Ah. In the battery pack BP, the maximum voltage value may be 40V and the rated capacity may be 4.0Ah. In the battery pack BP, the maximum voltage value may be 40V and the rated capacity may be 5.0Ah.

[0069] As shown in Fig. 13, the battery pack BP includes a battery housing 52, a hook 54, a right battery rail 56, and a left battery rail 58. The battery housing 52 houses therein a cell of a rechargeable secondary battery, for example, a lithium ion battery. The shape of the cell is not particularly limited. For example, the cell may have a cylindrical shape or may be a laminated cell (pouch cell).

[0070] The battery housing 52 has a battery inlet 62 and a battery exhaust port 64. The battery inlet 62 and the battery exhaust port 64 communicate the interior space of the battery housing 52 with the exterior space.

[0071] The hook 54 is movably attached to the battery housing 52. The hook 54 includes an engagement portion 66 and an operation portion 68. The engagement portion 66 is, for example, an engagement claw. The engagement portion 66 normally protrudes to the outside of the battery housing 52. When the operation portion 68 is pushed into the battery housing 52, the entire engagement portion 66 moves into the inside of the battery housing 52.

[0072] The right battery rail 56 and the left battery rail 58 are disposed near the battery exhaust port 64. The right battery rail 56 and the left battery rail 58 face each other in the left-right direction. The engagement portion 66 is disposed between the right battery rail 56 and the left battery rail 58. As shown in FIG. 15, when the motor unit 4 is placed on the reference plane P (see FIG. 17), and the battery pack BP is slid in the first direction D1 (direction away from the reference plane P) from the rear side of the main housing 12 toward the front upper side, the battery pack BP is guided by the right rail 38 (see FIG. 10) and the left rail 40 (see FIG. 10) and slides on the upper surface 26a of the rear upper wall 26. In addition, the right rail claw 46 engages with the right battery rail 56 (see FIG. 13), and the left rail claw 50 engages with the left battery rail 58 (see FIG. 13). While the battery pack BP slides on the upper surface 26a, the engagement portion 66 (see FIG. 13) is pressed into the battery housing 52 by the upper surface 26a. As shown in FIG. 11, a groove 26b is formed in the upper surface 26a, and when the engagement portion 66 reaches the groove 26b, it protrudes from the inside of the battery housing 52 to the outside and engages with the upper surface 26a in the groove 26b. This causes the battery pack BP to be attached to the main body housing 12. At this time, the battery exhaust port 64 faces the opening 43. As shown in FIG. 10, the groove 26b is disposed across the right main body housing 14 and the left main body housing 16. As shown in FIG. 15, when the battery pack BP is attached to the main body housing 12, a space 72 is defined between the lower rear end of the battery pack BP and the main body housing 12. The user holds the battery pack BP with his / her finger inserted into the space 72, and slides the battery pack BP in the second direction D2 while pushing in the operation portion 68. The battery pack BP can be easily removed from the main housing 12 due to the gravity of the battery pack BP.

[0073] As shown in Fig. 7 and Fig. 16, in the motor unit 4 of this embodiment, various battery packs BP can be attached to the main body housing 12. For example, the battery pack BP1 shown in Fig. 7 has a maximum voltage value of 40 V and a rated capacity of, for example, 8.0 Ah. Also, the battery pack BP shown in Fig. 16, i.e., the battery pack BP2, has a maximum voltage value of 40 V and a rated capacity of 2.5 Ah. The size of the battery pack BP2 is smaller than the size of the battery pack BP1.

[0074] As shown in Fig. 8, an intake cover 76 is fixed to the rear of the right wall 20 of the main housing 12, and the intake cover 76 has an intake port 78. The intake port 78 is equipped with a plurality of intake openings 80. As shown in Fig. 17, the intake openings 80 communicate between the storage space 17 of the main housing 12 and the space outside the main housing 12.

[0075] An air guide 84 is sandwiched between the intake cover 76 and the right wall 20. The air guide 84 is disposed in the accommodation space 17. The air guide 84 is separated from the intake port 78. The air guide 84 has an intake path 86 that communicates with the intake port 78. The intake path 86 extends in the vertical direction. The intake path 86 communicates with the accommodation space 17 at its lower end.

[0076] As shown in FIG. 7 and FIG. 8, the main body housing 12 further includes a first exhaust port 88 and a second exhaust port 90. As shown in FIG. 8, the first exhaust port 88 is disposed in the front part of the right wall 20. The first exhaust port 88 is disposed in front of the intake cover 76. Therefore, the intake port 80 is disposed rearward of the first exhaust port 88. When the motor unit 4 and the working unit 6 (see FIG. 37) are combined, the front end of the motor unit 4 is fixed to the working unit 6, so that the intake port 80 is farther away from the working unit 6 than the first exhaust port 88. Therefore, even if water or dust is generated by the work of the working unit 6, it is possible to prevent the water or dust from entering the accommodation space 17 (see FIG. 17) of the main body housing 12 from the intake port 80. The first exhaust port 88 includes a plurality of first exhaust ports 92. The first exhaust ports 92 communicate the accommodation space 17 (see FIG. 17) of the main body housing 12 with the space outside the main body housing 12.

[0077] As shown in Fig. 7, the second exhaust port 90 is disposed in the front of the left wall 22. The position of the second exhaust port 90 in the front-rear direction is substantially the same as the position of the first exhaust port 88 (see Fig. 8) in the front-rear direction. The second exhaust port 90 has a plurality of second exhaust openings 94. The second exhaust openings 94 communicate between the storage space 17 (see Fig. 17) of the main body housing 12 and the space outside the main body housing 12.

[0078] 7 and 8, the main body housing 12 includes a circuit board accommodating section 98, a motor accommodating section 100, and a battery attachment section 102. The circuit board accommodating section 98 is located in the lower part of the main body housing 12. The circuit board accommodating section 98 is defined by the lower part of the right wall 20, the lower part of the left wall 22, the bottom wall 24, the lower part of the rear wall 30, and the front vertical wall 32.

[0079] The motor accommodating portion 100 is disposed above the board accommodating portion 98. The front-rear length of the motor accommodating portion 100 is longer than the front-rear length of the board accommodating portion 98. The front-rear length of the motor accommodating portion 100 is approximately the same as the front-rear length of the main housing 12. The battery attachment portion 102 is defined by an upper portion of the right wall 20, an upper portion of the left wall 22, the front upper wall 28, an upper portion of the rear wall 30, and the front horizontal wall 34.

[0080] The battery mounting section 102 is disposed above the motor accommodating section 100. The battery mounting section 102 is defined by the upper rear wall 26, the right rail 38, the left rail 40, and the connecting wall 42. That is, the battery mounting section 102 includes the upper rear wall 26, the right rail 38, the left rail 40, and the connecting wall 42.

[0081] 17, the left-right width of the board accommodating portion 98 and the left-right width of the battery attachment portion 102 are each shorter than the left-right width of the motor accommodating portion 100. In other words, the left-right widths of the upper and lower portions of the main body housing 12 are shorter than the left-right width of the center of the main body housing 12. For this reason, the main body housing 12 is smaller than a configuration in which the left-right width of the main body housing 12 is constant in the up-down direction.

[0082] As shown in Fig. 18, the motor unit 4 includes a control unit 106, a battery terminal 108, a motor housing 110, a motor 112, a cooling fan 114, and an output unit 116. Note that the internal configuration of the battery pack BP is omitted in Fig. 18. The control unit 106, the battery terminal 108, the motor housing 110, the motor 112, the cooling fan 114, and the output unit 116 are disposed in the accommodation space 17.

[0083] As shown in FIG. 19, the control unit 106 is sandwiched between the right body housing 14 and the left body housing 16 (see FIG. 17) and is supported by both the right body housing 14 and the left body housing 16. As shown in FIG. 18, the control unit 106 is disposed in the board housing portion 98. The control unit 106 abuts against the front vertical wall 32. The control unit 106 is separated from the rear wall 30 in the front-rear direction. The control unit 106 is electrically connected to the battery terminal 108 via a first lead wire LW1. The control unit 106 is electrically connected to the motor 112 via a second lead wire LW2. The control unit 106 is electrically connected to the main power switch 35 via a third lead wire LW3. The control unit 106 operates with power supplied from the battery pack BP. The control unit 106 controls the motor 112 and the main power switch 35.

[0084] The control unit 106 includes a control board 120 having a microcomputer and a plurality of switching elements, and a metal case 122. The switching elements are, for example, IGBTs or MOSFETs. The switching elements are switched between an on state and an off state under the control of the microcomputer. The control board 120 is disposed along the bottom wall 24.

[0085] The case 122 has a case shape with an open upper end. Therefore, the second lead wire LW2 can be easily connected to the control board 120, and the third lead wire LW3 can be easily connected to the main power switch 35. The case 122 accommodates the control board 120 therein. The control board 120 is attached to the case 122. The case 122 is disposed along the bottom wall 24.

[0086] 20, the control unit 106 further includes a plurality of heat dissipation fins 124 made of an aluminum alloy. The plurality of heat dissipation fins 124 are disposed on the lower surface of the case 122. The plurality of heat dissipation fins 124 are integrally formed with the case 122. The heat dissipation fins 124 have a plate shape extending in the front-rear direction. The plurality of heat dissipation fins 124 are spaced apart from each other in the left-right direction.

[0087] As shown in FIG. 19, the battery terminal 108 is sandwiched between the right body housing 14 and the left body housing 16 (see FIG. 17) and is supported by both the right body housing 14 and the left body housing 16. As shown in FIG. 18, the battery terminal 108 is disposed on the rear upper wall 26. In the front-rear direction, the battery terminal 108 is disposed between the front end and the rear end of the control unit 106. When the motor unit 4 is viewed in the downward direction, the battery terminal 108 at least partially overlaps with the control unit 106. As shown in FIG. 17, the length L1 of the battery terminal 108 in the left-right direction is shorter than the length L2 of the control unit 106 in the left-right direction.

[0088] As shown in FIG. 10, the battery terminal 108 includes a terminal base 128 and a plurality of terminal members 130. The terminal base 128 has a generally plate shape. The terminal base 128 is disposed between the right rail 38 and the left rail 40 in the left-right direction. The terminal base 128 penetrates the rear upper wall 26. An outer surface 128a of the terminal base 128 is exposed to the space outside the main body housing 12. The outer surface 128a corresponds to the upper surface of the terminal base 128. The outer surface 128a of the terminal base 128 is disposed on approximately the same plane as the upper surface 26a of the rear upper wall 26. Therefore, the inclination angle B of the outer surface 128a with respect to the reference plane P (see FIG. 11) is 5 degrees or more and 45 degrees or less.

[0089] The multiple terminal members 130 are fixed to the terminal base 128. The terminal members 130 protrude from the terminal base 128. The terminal members 130 are made of, for example, a metal material. When the battery pack BP (see FIG. 13) is attached to the battery attachment portion 102 of the main body housing 12, the terminal members 130 are electrically connected to battery terminal members (not shown) of the battery pack BP. This allows power from the battery pack BP to be supplied to the motor unit 4. The terminal members 130 are also connected to the first lead wire LW1. Therefore, power from the battery pack BP is supplied to the control unit 106 via the first lead wire LW1.

[0090] As shown in FIG. 19, the motor housing 110 is sandwiched between the right body housing 14 and the left body housing 16 (see FIG. 17) and is supported by both the right body housing 14 and the left body housing 16. As shown in FIG. 18, the motor housing 110 is disposed at the front of the motor accommodating section 100. The motor housing 110 is separated from the rear wall 30 in the front-rear direction. In the up-down direction, the motor housing 110 is disposed between the control unit 106 and the battery terminal 108. When the motor unit 4 is viewed downward, the motor housing 110 at least partially overlaps with each of the control unit 106 and the battery terminal 108.

[0091] As shown in FIG. 21, the right main body housing 14 has a plurality of right battery support walls 134 (three in this embodiment) protruding from the inner surface of the right main body housing 14. The plurality of right battery support walls 134 are disposed in the motor housing portion 100. The plurality of right battery support walls 134 are disposed forward of the air guide 84 and the intake cover 76 (see FIG. 17). The plurality of right battery support walls 134 are disposed rearward of the first exhaust port 88. As shown in FIG. 22, the left main body housing 16 has a plurality of left battery support walls 136 (three in this embodiment) protruding from the inner surface of the left main body housing 16. The plurality of left battery support walls 136 are disposed in the motor housing portion 100. The plurality of left battery support walls 136 are disposed rearward of the second exhaust port 90. The multiple right battery support walls 134 (see FIG. 21) and the multiple left battery support walls 136 sandwich the motor housing 110 (see FIG. 18) so as to surround the outer circumferential surface of the motor housing 110. As a result, the motor housing 110 is supported by the right main body housing 14 and the left main body housing 16.

[0092] As shown in FIG. 21, the right main housing 14 includes a right support portion 137a, a first right pin support portion 137b, a second right pin support portion 137c, and a right retaining portion 137d.

[0093] The right support portion 137a includes two right support ribs 137e. The two right support ribs 137e protrude from the inner surface of the right main body housing 14. The two right support ribs 137e are disposed rearward of the first exhaust port 88. The two right support ribs 137e are spaced apart in the up-down direction. The right support rib 137e extends in the front-rear direction. The right support rib 137e crosses the right battery support wall 134 located in the center in the front-rear direction. The front end of the right support rib 137e is connected to the right battery support wall 134 located at the frontmost side. The rear end of the right support rib 137e is disposed between the right battery support wall 134 located at the center and the right battery support wall 134 located at the rearmost side.

[0094] The first right pin support portion 137b protrudes from the inner surface of the right main body housing 14. The first right pin support portion 137b is connected to the rear ends of the two right support ribs 137e and the right battery support wall 134 located at the rearmost side. The first right pin support portion 137b has a substantially cylindrical shape. The first right pin support portion 137b supports the first right pin 137f. The first right pin 137f is made of an elastic material. The first right pin 137f has a substantially cylindrical shape. The first right pin 137f is inserted into the first right pin support portion 137b and is received by the first right pin support portion 137b. When the first right pin 137f is received by the first right pin support portion 137b, the major axis of the first right pin 137f extends in the left-right direction.

[0095] The second right pin support portion 137c protrudes from the inner surface of the right main body housing 14. The second right pin support portion 137c is disposed forward of the first exhaust port 88. The second right pin support portion 137c is a rib having a frame shape (approximately O-shaped). The second right pin support portion 137c supports the second right pin 137g. The second right pin 137g is made of an elastic material. The second right pin 137g has an approximately cylindrical shape. The second right pin 137g is inserted into the second right pin support portion 137c and is received by the second right pin support portion 137c. When the second right pin 137g is received by the second right pin support portion 137c, the major axis of the second right pin 137g extends in the up-down direction.

[0096] The right retaining portion 137d protrudes from the inner surface of the right main body housing 14. The right retaining portion 137d is disposed forward of the second right pin support portion 137c. The right retaining portion 137d is disposed near the front end of the right main body housing 14. The right retaining portion 137d is a rib having a substantially U-shape. The right retaining portion 137d extends forward, then bends to extend downward, and further bends to extend rearward.

[0097] As shown in FIG. 22, the left main body housing 16 includes a left support portion 138a, a first left pin support portion 138b, a second left pin support portion 138c, and a left retaining portion 138d.

[0098] The left support portion 138a is disposed at a position facing the right support portion 137a (see FIG. 21) in the left-right direction. The left support portion 138a includes two left support ribs 138e. The two left support ribs 138e protrude from the inner surface of the left main body housing 16. The two left support ribs 138e are disposed rearward of the second exhaust port 90. The two left support ribs 138e are spaced apart in the up-down direction. The left support rib 138e extends in the front-rear direction. The left support rib 138e crosses the left battery support wall 136 located in the center in the front-rear direction. The front end of the left support rib 138e is connected to the left battery support wall 136 located at the frontmost side. The rear end of the left support rib 138e is disposed between the left battery support wall 136 located at the center and the left battery support wall 136 located at the rearmost side.

[0099] The first left pin support portion 138b is disposed at a position facing the first right pin support portion 137b (see FIG. 21) in the left-right direction. The first left pin support portion 138b protrudes from the inner surface of the left main body housing 16. The first left pin support portion 138b is connected to the rear ends of the two left support ribs 138e and to the left battery support wall 136 located at the rearmost side. The first left pin support portion 138b has a substantially cylindrical shape. The first left pin support portion 138b supports the first left pin 138f. The first left pin 138f is made of an elastic material. The first left pin 138f has a substantially cylindrical shape. The first left pin 138f is inserted into the first left pin support portion 138b and is received by the first left pin support portion 138b. When the first left pin 138f is received in the first left pin support portion 138b, the major axis of the first left pin 138f extends in the left-right direction.

[0100] The second left pin support portion 138c is disposed at a position facing the second right pin support portion 137c (see FIG. 21) in the left-right direction. The second left pin support portion 138c protrudes from the inner surface of the left main body housing 16. The second left pin support portion 138c is disposed forward of the second exhaust port 90. The second left pin support portion 138c is a rib having a frame shape (approximately O-shaped). The second left pin support portion 138c supports the second left pin 138g. The second left pin 138g is made of an elastic material. The second left pin 138g has an approximately cylindrical shape. The second left pin 138g is inserted into the second left pin support portion 138c and is received by the second left pin support portion 138c. When the second left pin 138g is received by the second left pin support portion 138c, the major axis of the second left pin 138g extends in the up-down direction.

[0101] The left retaining portion 138d is disposed at a position facing the right retaining portion 137d (see FIG. 21) in the left-right direction. The left retaining portion 138d protrudes from the inner surface of the left main body housing 16. The left retaining portion 138d is disposed forward of the second left pin support portion 138c. The left retaining portion 138d is disposed near the front end of the left main body housing 16. The left retaining portion 138d is a rib having a substantially U-shape. The left retaining portion 138d extends forward, then bends to extend downward, and then bends again to extend rearward.

[0102] As shown in Figure 23, the motor housing 110 includes a motor housing body 140 and a baffle plate 142. The motor housing body 140 has a generally cylindrical shape with a bottom wall 144 at its rear end. The baffle plate 142 is fixed to the front end of the motor housing body 140 by two screws 145. The baffle plate 142 closes a portion of the front end opening of the motor housing body 140.

[0103] As shown in FIG. 24, the motor housing main body 140 has a plurality of motor intake ports 146. The plurality of motor intake ports 146 penetrate the bottom wall 144. The plurality of motor intake ports 146 communicate the accommodation space 17 with the internal space of the motor housing 110. As shown in FIG. 25, in the front-rear direction, the positions of the plurality of motor intake ports 146 are substantially the same as the positions of the right battery support wall 134 located at the rearmost side and the left battery support wall 136 located at the rearmost side. Therefore, the plurality of motor intake ports 146 are disposed forward of the air guide 84 (see FIG. 17) and the intake cover 76 (see FIG. 17). In addition, the plurality of motor intake ports 146 are surrounded by the right battery support wall 134 located at the rearmost side and the left battery support wall 136 located at the rearmost side. As shown in FIG. 17, the plurality of motor intake ports 146 are disposed between the control unit 106 and the battery terminal 108.

[0104] As shown in FIG. 26, two right ribs 148a and two left ribs 148b are formed on the outer circumferential surface of the motor housing main body 140. The two right ribs 148a protrude to the right from the outer circumferential surface of the motor housing main body 140. The two right ribs 148a are spaced apart in the up-down direction. The right rib 148a extends in the front-rear direction. The two left ribs 148b protrude to the left from the outer circumferential surface of the motor housing main body 140. The two left ribs 148b are spaced apart in the up-down direction. The left rib 148b extends in the front-rear direction. The center position between the two left ribs 148b is spaced 180 degrees around an axis extending in the front-rear direction from the center position between the two right ribs 148a.

[0105] In the vertical direction, the two right ribs 148a are sandwiched between the two right support ribs 137e. In addition, in the vertical direction, the two left ribs 148b are sandwiched between the two left support ribs 138e. In this way, the motor housing 110 is supported by the right main body housing 14 and the left main body housing 16.

[0106] 27, the outer peripheral surface of the motor housing main body 140 abuts against the first right pin 137f and the first left pin 138f. As a result, the motor housing 110 is supported by the right main body housing 14 and the left main body housing 16 via the first right pin 137f and the first left pin 138f. Even when a minute gap is formed between the outer peripheral surface of the motor housing main body 140 and the right main body housing 14, or when a minute gap is formed between the outer peripheral surface of the motor housing main body 140 and the left main body housing 16, the first right pin 137f and the first left pin 138f suppress rattling of the motor housing 110 relative to the right main body housing 14 and the left main body housing 16.

[0107] As shown in FIG. 18, the motor 112 is disposed at the front of the motor housing 100. The motor 112 is, for example, an inner rotor type brushless motor. In a modified example, the motor 112 may be an outer rotor type brushless motor or a brushed motor. The motor 112 becomes operable when the motor unit 4 is switched to the on state by operating the main power switch 35 (see FIG. 7). The motor 112 operates with power supplied from the battery pack BP. The motor 112 is housed in the motor housing 110. The baffle plate 142 prevents the motor 112 from slipping out of the motor housing 110.

[0108] In the vertical direction, the motor 112 is disposed between the control unit 106 and the battery terminal 108. When the motor unit 4 is viewed downward, the motor 112 at least partially overlaps with the control unit 106 and the battery terminal 108. The motor 112 is disposed forward of the center position of the control unit 106 in the front-rear direction and the center position of the battery terminal 108 in the front-rear direction. As shown in FIG. 28, the length L3 of the motor 112 in the front-rear direction is shorter than the length L4 of the main body housing 12 in the front-rear direction. The length L4 is 1.5 times or more and 2.0 times or less than L3. The length L3 is shorter than the length L5 of the control unit 106 in the front-rear direction. The diameter DA1 of the motor 112 is shorter than the length L6 of the main body housing 12 in the vertical direction. The length L6 is 2.3 times or more and 3.3 times or less than the diameter DA1. As shown in FIG. 17, the diameter DA1 of the motor 112 is longer than the length L1 of the battery terminal 108 in the left-right direction. The diameter DA1 of the motor 112 is shorter than the length L2 of the control unit 106 in the left-right direction.

[0109] As shown in FIG. 9, the weight of the motor 112 is 0.7 kg or more and 1.1 kg or less. The length L3 of the motor 112 in the front-rear direction is 110 mm or more and 119 mm or less. The diameter DA1 of the motor 112 is 85 mm or more and 100 mm or less. The volume of the motor 112 is 500 cm 3 Above 1500cm 3 14, the maximum output value of the motor 112 is 0.5 kW or more and 2.0 kW or less. The motor 112 is a low-output type motor. The maximum output value of the motor 112 may be 0.5 kW or more and 1.5 kW or less. The maximum output value of the motor 112 may be 0.5 kW or more and 1.2 kW or less. The maximum output value of the motor 112 may be 0.5 kW or more and 1.0 kW or less. The maximum current value of the motor 112 is 35 A or more and 50 A or less. The torque of the motor 112 is 1.5 N·m or more and 3.0 N·m or less. The rotation speed of the motor 112 is 4000 rpm or more and 10000 rpm or less.

[0110] As shown in FIG. 23, the motor 112 includes a stator body 150, a plurality of coils 152 (six in this embodiment), a rotor body 154, a plurality of permanent magnets 156 (see FIG. 24), and a motor shaft 158. Each coil 152 is wound around the stator body 150. The rotor body 154 is inserted into the central opening of the stator body 150. As shown in FIG. 24, the rotor body 154 has a plurality of cooling openings 154a penetrating the rotor body 154 in the front-rear direction. The plurality of permanent magnets 156 are disposed inside the rotor body 154. The plurality of permanent magnets 156 are disposed radially outward of the rotor body 154 relative to the plurality of cooling openings 154a. The motor shaft 158 ​​penetrates the rotor body 154 in the front-rear direction. The motor shaft 158 ​​extends in the front-rear direction. The length of the motor shaft 158 ​​in the front-rear direction is substantially the same as the length L3 of the motor 112 in the front-rear direction. A rear end of the motor shaft 158 ​​is rotatably supported by the motor housing body 140 via a bearing 160. A front end of the motor shaft 158 ​​is rotatably supported by the output unit 116 via a bearing 162. The motor shaft 158 ​​rotates around a rotation axis AX that extends in the front-rear direction.

[0111] When the microcomputer of the control unit 106 (see FIG. 18) selectively switches the switching elements between the on state and the off state, power from the battery pack BP (see FIG. 18) is supplied to each coil 152. A magnetic field generated in each coil causes multiple permanent magnets 156 to rotate around the rotation axis AX. This causes the rotor body 154 and the motor shaft 158 ​​to rotate around the rotation axis AX.

[0112] The cooling fan 114 is fixed to the motor shaft 158 ​​outside the motor housing 110. The cooling fan 114 is disposed inside the output unit 116. The cooling fan 114 is disposed on the motor housing 110 side of the bearing 162. The cooling fan 114 is a centrifugal fan. In a modified example, the cooling fan 114 may be an axial fan. The cooling fan 114 rotates integrally with the motor shaft 158 ​​around the rotation axis AX.

[0113] 29, the output unit 116 has a first motor exhaust port 166 and a second motor exhaust port 168. The first motor exhaust port 166 and the second motor exhaust port 168 are disposed radially outside the cooling fan 114. The first motor exhaust port 166 faces the first exhaust port 88. The second motor exhaust port 168 faces the second exhaust port 90. The second motor exhaust port 168 is disposed at a position 180 degrees away from the first motor exhaust port 166 with respect to the rotation axis AX.

[0114] When the cooling fan 114 rotates, as shown in FIG. 17, air passes through the intake port 78 and flows from the space outside the main housing 12 into the intake path 86. In the drawing, the flow of air is indicated by an arrow line indicated by the symbol F. The air flows from the lower end of the intake path 86 into the accommodation space 17. The air then flows around the control unit 106 in a clockwise direction when looking forward at the motor unit 4. The air cools the multiple heat dissipation fins 124, thereby cooling the control board 120. The air then passes between the control unit 106 and the battery terminal 108 and flows forward toward the multiple motor intake ports 146. This cools the control unit 106 and the battery terminal 108.

[0115] Also, as shown in FIG. 18, a part of the air that has flowed into the accommodation space 17 from the intake path 86 (see FIG. 17) flows rearward along the plurality of heat dissipation fins 124. The plurality of heat dissipation fins 124 are cooled by the air, thereby cooling the control board 120. The air then passes between the control unit 106 and the rear wall 30 and flows upward. The air then passes between the control unit 106 and the battery terminal 108 and flows forward toward the plurality of motor intake ports 146. This cools the control unit 106 and the battery terminal 108.

[0116] Furthermore, as shown in FIG. 11, air passes through the battery intake port 62 (see FIG. 13) and flows from the external space of the battery housing 52 into the internal space. The flowing-in air flows through the internal space of the battery housing 52. This cools the battery pack BP. The air then passes through the battery exhaust port 64 of the battery housing 52 and the opening 43 between the connecting wall 42 and the front end of the rear upper wall 26, and flows from the internal space of the battery housing 52 into the storage space 17 of the main body housing 12. The flowing-in air flows rearward along the rear upper wall 26, then turns around and flows forward toward the multiple motor intake ports 146 (see FIG. 24).

[0117] As shown in FIG. 24, the multiple motor intake ports 146 are surrounded by the right battery support wall 134 located at the rearmost side and the left battery support wall 136 located at the rearmost side (see FIG. 25). Therefore, the right battery support wall 134 and the left battery support wall 136 define an air passage so that air flows from the multiple motor intake ports 146 into the internal space of the motor housing 110. As a result, air flows from the multiple motor intake ports 146 into the internal space of the motor housing 110. The flowing-in air flows forward through the multiple cooling openings 154a. The flowing-in air also flows forward between the stator body 150 and the rotor body 154. As a result, the motor 112 is cooled.

[0118] 29, when the air reaches the cooling fan 114, it is sent by the cooling fan 114 in a direction away from the rotation axis AX (i.e., radially outward from the cooling fan 114). The air sent to the cooling fan 114 passes through the first motor exhaust port 166 and the first exhaust port 88, and is discharged to the space outside the main body housing 12. The air sent to the cooling fan 114 passes through the second motor exhaust port 168 and the second exhaust port 90, and is discharged to the space outside the main body housing 12.

[0119] 28, the output unit 116 is disposed at the front of the motor accommodating section 100. The vicinity of the front end of the output unit 116 is exposed to the space outside the main body housing 12. The output unit 116 is inserted into the front end of the main body housing 12. The output unit 116 is fixed to the front end of the motor housing 110. A length L7 of the output unit 116 in the front-rear direction is shorter than a length L3 of the motor 112 in the front-rear direction.

[0120] As shown in FIG. 30, the output unit 116 includes a mount base 172, an intermediate member 174, a first clutch shoe 176, a second clutch shoe 178, and a clutch spring 180.

[0121] The mount base 172 is fixed to the front end of the motor housing main body 140 by four screws 182 (see FIG. 23). The mount base 172 includes a cylindrical portion 184, a flange portion 186, a partition wall portion 188, and a first screw boss portion 190. The inner surface of the cylindrical portion 184 has a substantially circular cross-sectional shape. A first motor exhaust port 166 (see FIG. 29) and a second motor exhaust port 168 are formed at the rear end of the cylindrical portion 184.

[0122] 31, the outer surface of the tube portion 184 abuts against the second right pin 137g and the second left pin 138g. As a result, the mount base 172 is supported by the right main body housing 14 and the left main body housing 16 via the second right pin 137g and the second left pin 138g. In addition, the second right pin 137g and the second left pin 138g suppress rattling of the mount base 172 relative to the right main body housing 14 and the left main body housing 16.

[0123] As shown in FIG. 32, a right protruding wall 184a and a left protruding wall 184b are formed on the outer surface of the tube portion 184. The right protruding wall 184a protrudes to the right from the outer surface of the tube portion 184. The right protruding wall 184a is received in the right retaining portion 137d of the right main body housing 14. The right protruding wall 184a is disposed in front of the second right pin support portion 137c. The left protruding wall 184b protrudes to the left from the outer surface of the tube portion 184. The left protruding wall 184b is received in the left retaining portion 138d of the left main body housing 16. The left protruding wall 184b is disposed in front of the second left pin support portion 138c.

[0124] When a force in the forward direction acts on the mount base 172, the right protruding wall portion 184a abuts against the right retaining portion 137d from the rear side, and the left protruding wall portion 184b abuts against the left retaining portion 138d from the rear side. This prevents the mount base 172 from moving forward relative to the main body housing 12 and coming out of the main body housing 12. When a force in the rear direction acts on the mount base 172, the right protruding wall portion 184a abuts against the second right pin support portion 137c from the front side, and the left protruding wall portion 184b abuts against the second left pin support portion 138c from the front side. This prevents the mount base 172 from moving backward relative to the main body housing 12.

[0125] As shown in FIG. 30, the flange portion 186 is disposed at the front end of the tubular portion 184. The flange portion 186 protrudes from the tubular portion 184 in a direction away from the rotation axis AX. A front surface 186a of the flange portion 186 is disposed on a plane including the left-right direction and the up-down direction. The outer surface of the flange portion 186 has a substantially rectangular shape. The outer surface of the flange portion 186 is surrounded by the main body housing 12 (see FIG. 19). This prevents the mount base 172 from rotating around the rotation axis AX relative to the main body housing 12. The flange portion 186 can be fixed to the working unit 6 (see FIG. 1) with the front surface 186a in contact with the working unit 6. The front surface 186a of the flange portion 186 corresponds to a fixing portion.

[0126] As shown in FIG. 28, the partition wall portion 188 is disposed on the inner surface of the cylindrical portion 184. The partition wall portion 188 is disposed near the center position of the cylindrical portion 184 in the front-rear direction. The partition wall portion 188 divides the internal space of the cylindrical portion 184 into a front space 192 and a rear space 194. The cooling fan 114 is disposed in the rear space 194. The motor shaft 158 ​​penetrates the partition wall portion 188. The partition wall portion 188 rotatably supports the motor shaft 158 ​​via a bearing 162. As shown in FIG. 30, the partition wall portion 188 has four screw holes 188a. The screw holes 188a penetrate the partition wall portion 188 in the front-rear direction. The four screw holes 188a are disposed near the inner surface of the cylindrical portion 184. The four screw holes 188a are disposed at equal intervals around the rotation axis AX.

[0127] The first screw boss portion 190 protrudes downward from the tube portion 184. The first screw boss portion 190 is inserted into the through hole 36 of the main body housing 12. This determines the position of the mount base 172 in the front-rear direction relative to the main body housing 12. The mount base 172 is also fixed to the main body housing 12.

[0128] As shown in Fig. 29, the first screw boss portion 190 has two cylindrical portions 190a aligned in the left-right direction. The cylindrical portions 190a have a screw hole 190b. The screw hole 190b extends upward from the lower end of the cylindrical portions 190a. The screw hole 190b can be screwed into a screw 364 (see Fig. 49). The first screw boss portion 190 is configured to be fixed to the working unit 6 (see Fig. 1) via the screw hole 190b and the screw 364.

[0129] 30, the mount base 172 has four second screw boss portions 191. The four second screw boss portions 191 are formed by the tube portion 184 and the flange portion 186. The second screw boss portions 191 are located near the corners of the flange portion 186. The second screw boss portions 191 extend in the front-rear direction.

[0130] As shown in Fig. 33, the second screw boss portion 191 has a front screw hole 191a and a rear screw hole 191b. The front screw hole 191a extends rearward from the front end of the second screw boss portion 191. The front screw hole 191a can be screwed into a screw 256 (see Fig. 41). The second screw boss portion 191 is configured to be fixed to the working unit 6 (see Fig. 1) via the front screw hole 191a and the screw 256.

[0131] The rear screw hole 191b extends in the front direction from the rear end of the second screw boss portion 191. The rear screw hole 191b is not connected to the front screw hole 191a. The rear screw hole 191b and the front screw hole 191a are arranged on a straight line. The rear screw hole 191b can be screwed into the screw 182. The second screw boss portion 191 is fixed to the motor housing body 140 by screwing the screw 182 into the rear screw hole 191b.

[0132] The intermediate member 174 is disposed in the front space 192. The intermediate member 174 has an elongated shape. A central portion of the intermediate member 174 in the longitudinal direction is fixed to the front end of the motor shaft 158.

[0133] 34, the first clutch shoe 176 has an arc shape. One end of the first clutch shoe 176 is movably attached to one end of the intermediate member 174 via a bolt 196. A friction member 198 is fixed to a surface of the first clutch shoe 176 that faces the inner surface of the cylindrical portion 184.

[0134] The shape of the second clutch shoe 178 is substantially the same as the shape of the first clutch shoe 176. One end of the second clutch shoe 178 is movably attached to the other end of the intermediate member 174 via a bolt 200. A friction member 202 is fixed to a surface of the second clutch shoe 178 that faces the inner surface of the cylindrical portion 184 of the second clutch shoe 178. One end of the second clutch shoe 178 faces the other end of the first clutch shoe 176. The other end of the second clutch shoe 178 faces one end of the first clutch shoe 176.

[0135] The clutch spring 180 is attached to the first clutch shoe 176 and the second clutch shoe 178. The clutch spring 180 is, for example, a compression spring. The clutch spring 180 biases the first clutch shoe 176 and the second clutch shoe 178 in directions in which they approach each other.

[0136] When motor shaft 158 ​​rotates about rotation axis AX, first clutch shoe 176 and second clutch shoe 178 rotate about rotation axis AX. When the rotation speed of motor shaft 158 ​​reaches or exceeds a predetermined rotation speed, first clutch shoe 176 and second clutch shoe 178 move against the biasing force of clutch spring 180. At this time, the other end of first clutch shoe 176 and the other end of second clutch shoe 178 move radially outward toward the inner surface of cylindrical portion 184.

[0137] 18, when the battery pack BP is attached to the main body housing 12, the center of gravity G1 of the motor unit 4 is located inside the motor 112. The center of gravity G1 is located forward of the center position of the main body housing 12 in the front-rear direction and the front end of the battery terminal 108. The center of gravity G1 is located rearward of the front end of the control unit 106. The center of gravity G1 is located above the rotation axis AX of the motor shaft 158.

[0138] When the battery pack BP is not attached to the main body housing 12, the center of gravity G2 of the motor unit 4 is disposed within the motor 112. The center of gravity G2 is disposed forward of the center of gravity G1. The center of gravity G2 is disposed rearward of the front end of the control unit 106. The center of gravity G2 is disposed above the rotation axis AX of the motor shaft 158. The center of gravity G2 is disposed closer to the rotation axis AX than the center of gravity G1.

[0139] As shown in FIG. 35, the output unit 116 further includes a support member 206 and a spindle 208. The support member 206 and the spindle 208 can be applied to the motor unit 4 in place of the intermediate member 174, the first clutch shoe 176, the second clutch shoe 178, and the clutch spring 180. Hereinafter, the intermediate member 174, the first clutch shoe 176, the second clutch shoe 178, and the clutch spring 180 may be collectively referred to as a first output portion 212, the support member 206 and the spindle 208 may be collectively referred to as a second output portion 214, and the first output portion 212 and the second output portion 214 may be collectively referred to as an output portion 216. The motor unit 4 functions as a clutch type unit when the first output portion 212 is used, and functions as a spindle type unit when the second output portion 214 is used. When the motor unit 4 functions as a clutch type unit, the working unit 6 (see FIG. 1) is, for example, a slope grass cutter 6c, a brush cutter 6d using a backpack battery 280 (see FIG. 44), a screed 6e, a trowel 6f, a rammer 6g, a plate compactor 6h, a hand-held brush cutter 6i, an edger 6j, and a cultivator 6k. When the motor unit 4 functions as a spindle type unit, the working unit 6 (see FIG. 1) is, for example, a winch 6a. In the clutch type unit, the output unit 116 includes a mount base 172 and a first output part 212. In the spindle type unit, the output unit 116 includes a mount base 172 and a second output part 214. Depending on the type of the working unit 6 (see FIG. 1), one of the first output part 212 and the second output part 214 is selected.

[0140] 36, the support member 206 of the second output section 214 is fixed to the front surface of the partition wall section 188 by screwing the screws 218 into the screw holes 188a. The support member 206 is disposed in the front space 192.

[0141] The spindle 208 extends in the front-rear direction. The spindle 208 penetrates the support member 206 in the front-rear direction. The spindle 208 is rotatably supported by the support member 206 via a bearing 220. The rear end of the spindle 208 is fitted into the front end of the motor shaft 158. The spindle 208 rotates integrally with the motor shaft 158 ​​around the rotation axis AX. The spindle 208 operates the working unit 6 (see FIG. 1).

[0142] As shown in Figures 37 to 40, the motor unit 4 can be applied to various working units 6. In Figures 37 to 49, the coordinate system is changed to a different coordinate system from the above-mentioned coordinate system for explanation. Specifically, the direction perpendicular to the reference plane P is called the up-down direction, the direction perpendicular to the up-down direction is called the front-rear direction, and the direction perpendicular to the up-down direction and the front-rear direction is called the left-right direction.

[0143] As shown in Fig. 37, the motor unit 4 is applicable to a handheld brush cutter 6i, which is an example of a working unit 6. The handheld brush cutter 6i is held by a user. The handheld brush cutter 6i includes a pole 230, a handle unit 232, a fixed unit 234, a transmission shaft 236 (see Fig. 42), and a working unit 238.

[0144] The pole 230 has an elongated rod shape and rotatably supports a transmission shaft 236 (see FIG. 42) therein.

[0145] The handle unit 232 includes a fixed frame 240, a right handle 242, a left handle 244, a trigger 246, and a shark fin 248.

[0146] The fixed frame 240 has a substantially U-shape. A central portion of the fixed frame 240 in the longitudinal direction is fixed to the pole 230.

[0147] The right handle 242 is attached to one end in the longitudinal direction of the fixed frame 240. The left handle 244 is attached to the other end in the longitudinal direction of the fixed frame 240. A user holds the right handle 242 with his / her right hand and the left handle 244 with his / her left hand to handle the handheld brush cutter 6i.

[0148] The trigger 246 is attached to the front of the right handle 242 so as to be pressurized. The shark fin 248 is attached to the rear of the right handle 242 so as to be pressurized. When the shark fin 248 is pressed, the trigger 246 becomes pressurized. When the trigger 246 is pressed by the fingers of the user holding the right handle 242 with the shark fin 248 pressed by the palm of the user holding the right handle 242, the motor 112 (see FIG. 28) of the motor unit 4 is operated.

[0149] The fixed unit 234 is fixed to one end of the pole 230. As shown in FIG.

[0150] The fixed housing 252 is fixed to the flange portion 186 of the motor unit 4 by screwing the screws 256 into the front screw holes 191a. The rear end surface of the fixed housing 252 abuts against the front surface 186a of the flange portion 186.

[0151] The drum 254 is disposed inside the fixed housing 252. The drum 254 is rotatably supported by the fixed housing 252. As shown in FIG.

[0152] The cylindrical portion 258 has a generally cylindrical shape. When the fixed housing 252 is fixed to the flange portion 186 (see FIG. 41 ), the cylindrical portion 258 surrounds the first clutch shoe 176 and the second clutch shoe 178. The first clutch shoe 176 and the second clutch shoe 178 are disposed inside the cylindrical portion 258.

[0153] The bottom wall portion 260 closes one end of the opening of the cylindrical portion 258. The transmission shaft 236 is fixed to the bottom wall portion 260 via a coupler 262.

[0154] When the motor shaft 158 ​​rotates around the rotation axis AX and the rotation speed of the motor shaft 158 ​​reaches or exceeds a predetermined rotation speed, the other end of the first clutch shoe 176 and the other end of the second clutch shoe 178 move radially outward toward the inner surface of the cylindrical portion 184. As a result, the friction member 198 of the first clutch shoe 176 and the friction member 202 of the second clutch shoe 178 are pressed against the inner circumferential surface of the cylindrical portion 258. As a result, the rotation of the motor shaft 158 ​​is transmitted to the drum 254, and the drum 254 rotates integrally with the motor shaft 158 ​​around the rotation axis AX. As a result, the transmission shaft 236 rotates integrally with the drum 254.

[0155] As shown in Figure 37, the working unit 238 is fixed to the other end of the pole 230. The working unit 238 includes a housing 266 and a cutting blade 268. The housing 266 rotatably supports the transmission shaft 236 (see Figure 42).

[0156] The cutting blade 268 is rotatably supported by the housing 266. The cutting blade 268 rotates by rotation of the transmission shaft 236 (see FIG. 42). Therefore, the cutting blade 268 is operated by the motor 112 (see FIG. 28) of the motor unit 4. By rotating, the cutting blade 268 cuts grass growing above a reference plane P (e.g., the ground).

[0157] As shown in FIG. 43, when the working machine 8 consisting of the motor unit 4 and the handheld brush cutter 6i is placed in a working posture with respect to the reference plane P, the front surface 186a of the flange portion 186 faces the reference plane P. In FIG. 43, a plane parallel to the reference plane P is illustrated by a two-dot chain line. The front surface 186a faces the front lower side. That is, when the working machine 8 is placed in a working posture with respect to the reference plane P, the motor unit 4 is inclined so that the tip of the motor unit 4 faces the front lower side with respect to the reference plane P. The motor shaft 158 ​​is inclined with respect to the reference plane P. The inclination angle of the motor shaft 158 ​​with respect to the reference plane P is 30 degrees or more and 60 degrees or less. The battery terminal 108 and the battery pack BP are farther away from the reference plane P than the motor 112. The battery terminal 108 and the battery pack BP are arranged above the motor 112. The control unit 106 is arranged closer to the reference plane P than the motor 112. The control unit 106 is disposed below the motor 112 .

[0158] As shown in Fig. 44, the motor unit 4 may be equipped with a backpack battery 280 instead of the battery pack BP. In this case, the working unit 6 functions as a brush cutter 6d. The backpack battery 280 is equipped with a chargeable and dischargeable secondary battery, for example, a lithium ion battery. The backpack battery 280 is carried on the user's back via a harness 282.

[0159] As shown in Fig. 45, the motor unit 4 includes an adapter 284. The adapter 284 includes an adapter body 286 and an adapter cord 288. The adapter body 286 is slidably attached to the main body housing 12. The attachment structure of the adapter body 286 to the main body housing 12 is substantially the same as the attachment structure of the battery pack BP to the main body housing 12. Therefore, a detailed description of the attachment structure of the adapter body 286 to the main body housing 12 will be omitted. When the adapter body 286 is attached to the main body housing 12, the adapter body 286 is electrically connected to the battery terminal 108 (see Fig. 11).

[0160] The adapter cord 288 is attached to the adapter body 286. The adapter cord 288 is attached to a power cord 290 of the backpack battery 280. This allows power from the backpack battery 280 to be supplied to the motor unit 4 via the adapter 284.

[0161] 38, the motor unit 4 is applicable to a cultivator 6k, which is an example of a working unit 6. The cultivator 6k is a working unit that digs up soil on a reference surface P, for example, the ground. The cultivator 6k includes a base 291, wheels 292, a handle unit 294, and a working part 296.

[0162] An upper end of the base 291 is fixed to the flange portion 186 of the motor unit 4. The base 291 abuts against a front surface 186a of the flange portion 186.

[0163] The wheels 292 are rotatably supported by the base 291. The cultivator 6k moves on the reference plane P as the wheels 292 rotate.

[0164] The handle unit 294 includes a fixed frame 294a, a handle 294b, and a trigger 294c. The fixed frame 294a extends upward and rearward from the base 291.

[0165] The handle 294b is attached to the fixed frame 294a near a free end thereof. The handle 294b is held by a user. The user moves the cultivator 6k by holding the handle 294b and pushing it forward.

[0166] The trigger 294c is rotatably attached to the fixed frame 294a near the free end thereof. The trigger 294c is operated by a user's hand holding the handle 294b so as to approach the handle 294b. When the trigger 294c is operated, the motor 112 of the motor unit 4 is operated.

[0167] The working unit 296 includes a blade 296a. When the motor 112 is operated, the blade 296a rotates about an axis extending in the left-right direction. This causes the soil on the reference plane P, for example, the ground, to be dug up.

[0168] 46, the left-right width of the motor unit 4 is smaller than the left-right width of the cultivator 6k. In general, the left-right width of the motor unit 4 is smaller than the left-right width of the engine unit. For this reason, it is easier to visually recognize the reference plane P compared to when an engine unit is used.

[0169] As shown in FIG. 38, when the working machine 8 consisting of the motor unit 4 and the cultivator 6k is disposed in a working posture with respect to the reference plane P, the front surface 186a of the flange portion 186 faces the reference plane P. The front surface 186a faces downward. The motor shaft 158 ​​extends in the front-rear direction. The battery terminal 108 and the battery pack BP are disposed on the rear side of the motor 112. The control unit 106 is disposed on the front side of the motor 112. The motor 112, the battery terminal 108, the battery pack BP, and the control unit 106 are aligned along the reference plane P. When the battery pack BP is slid relative to the main body housing 12 in a direction approaching the reference plane P, the battery pack BP is attached to the main body housing 12. When the battery pack BP is slid relative to the main body housing 12 in a direction away from the reference plane P, the battery pack BP is removed from the main body housing 12. This prevents the battery pack BP from coming off the main body housing 12 due to its own weight. The battery terminal 108 is inclined with respect to a plane perpendicular to the reference plane P. The inclination angle is equal to or less than 45 degrees. This allows the user to remove the battery pack BP from the main body housing 12 without holding the main body housing 12 with his / her hands.

[0170] As shown in Fig. 47, the motor unit 4 can be fixed to the cultivation machine 6k in a posture different from that shown in Fig. 38. The battery terminal 108 and the battery pack BP are disposed in front of the motor 112. The control unit 106 is disposed behind the motor 112.

[0171] As shown in Fig. 39, the motor unit 4 is applicable to a winch 6a, which is an example of a working unit 6. The winch 6a is a working unit that lifts and lowers an object, for example. The winch 6a includes a mounting frame 300, a fixed frame 302, a handle 304, and a working unit 306.

[0172] The mounting frame 300 is disposed along a plane extending along the front-rear and left-right directions. When the winch 6a is placed on a reference plane P, the mounting frame 300 comes into contact with the reference plane P.

[0173] The fixed frame 302 extends upward from the mounting frame 300. The fixed frame 302 extends in a substantially vertical direction. The fixed frame 302 is fixed to the flange portion 186 of the motor unit 4. The fixed frame 302 abuts on a front surface 186a of the flange portion 186. The winch 6a further includes an operation switch 308, which is attached to the fixed frame 302 so as to be capable of being pressed in. When the operation switch 308 is pressed in, the motor 112 of the motor unit 4 operates.

[0174] The handle 304 is fixed near the upper end of the fixed frame 302. The handle 304 is held by a user. For example, the user holds the handle 304 to carry the winch 6a.

[0175] The working unit 306 includes a drum 310 and a hook 312. The drum 310 is fixed to the spindle 208 of the motor unit 4. The drum 310 is rotatably attached to the fixed frame 302. The drum 310 is disposed on the opposite side of the fixed frame 302 to the motor unit 4.

[0176] The hook 312 is fixed to the drum 310 via a rope (not shown). The hook 312 can be hooked to an object. When the motor shaft 158 ​​rotates with the hook 312 hooked to the object, the drum 310 rotates integrally with the spindle 208 around a rotation axis AX extending in the front-rear direction. This causes the rope to be wound onto the drum 310 or the rope to be pulled out from the drum 310. As a result, the object hooked to the hook 312 is raised or lowered.

[0177] When the working machine 8 consisting of the motor unit 4 and the winch 6a is in a working posture with respect to the reference plane P, the front surface 186a of the flange portion 186 faces the front direction along the reference plane P. That is, when the working machine 8 is disposed in a working posture with respect to the reference plane P, the motor unit 4 is disposed so that the front end of the motor unit 4 faces the front direction along the reference plane P. The motor shaft 158 ​​extends in the front-rear direction along the reference plane P. The battery terminal 108 and the battery pack BP are farther away from the reference plane P than the motor 112. The battery terminal 108 and the battery pack BP are disposed above the motor 112. The control unit 106 is disposed closer to the reference plane P than the motor 112. The control unit 106 is disposed below the motor 112.

[0178] 40, the motor unit 4 is applicable to a slope grass cutter 6c, which is an example of a working unit 6. The slope grass cutter 6c is a working unit that cuts grass growing above a reference plane P. The slope grass cutter 6c includes a housing 320, a pair of front wheels 322, a pair of rear wheels 324, a handle unit 326, and a working part 328.

[0179] An upper surface of the housing 320 is fixed to the flange portion 186 of the motor unit 4. The housing 320 abuts on a front surface 186a of the flange portion 186.

[0180] The pair of front wheels 322 are rotatably supported on the front part of the housing 320. The pair of rear wheels 324 are rotatably supported on the rear part of the housing 320. The slope grass mower 6c moves on the reference plane P as the pair of front wheels 322 and the pair of rear wheels 324 rotate.

[0181] The handle unit 326 includes a fixed frame 332, a handle 334, and a trigger 336. The fixed frame 332 has a substantially U-shape. Both ends of the fixed frame 332 in the longitudinal direction are fixed to the housing 320.

[0182] The handle 334 is attached to the upper part of the fixed frame 332. The handle 334 is held by a user. The user moves the slope grass mower 6c by holding the handle 334 and pushing it forward.

[0183] The trigger 336 is rotatably attached to the handle 334. The trigger 336 is operated by a user's hand holding the handle 334 so as to approach the handle 334. When the trigger 336 is operated, the motor 112 of the motor unit 4 is operated.

[0184] The working unit 328 includes a drum 340, a transmission shaft 342, and a blade 344. The drum 340 is rotatably supported by the housing 320. When the motor shaft 158 ​​rotates and the rotation speed of the motor shaft 158 ​​reaches or exceeds a predetermined rotation speed, the drum 340 is pressed against the friction member 198 (see FIG. 30) of the first clutch shoe 176 and the friction member 202 (see FIG. 30) of the second clutch shoe 178. As a result, the rotation of the motor shaft 158 ​​is transmitted to the drum 340, and the drum 340 rotates integrally with the motor shaft 158 ​​around a rotation axis AX extending in the vertical direction.

[0185] The transmission shaft 342 is fixed to the drum 340. The transmission shaft 342 extends in the vertical direction. The transmission shaft 342 rotates integrally with the drum 340 about the rotation axis AX.

[0186] The blade 344 is fixed to the transmission shaft 342. The blade 344 rotates integrally with the transmission shaft 342 around the rotation axis AX. As a result, grass growing on the reference plane P is cut.

[0187] When the working machine 8 consisting of the motor unit 4 and the slope mower 6c is placed in a working posture with respect to the reference plane P, the front surface 186a of the flange portion 186 faces the reference plane P. The front surface 186a faces downward. The motor shaft 158 ​​extends in the vertical direction. The battery terminal 108 and the battery pack BP are disposed on the front side of the motor 112. The control unit 106 is disposed on the rear side of the motor 112. The motor 112, the battery terminal 108, the battery pack BP, and the control unit 106 are aligned along the reference plane P. When the battery pack BP is slid relative to the main body housing 12 in a direction approaching the reference plane P, the battery pack BP is attached to the main body housing 12. When the battery pack BP is slid relative to the main body housing 12 in a direction away from the reference plane P, the battery pack BP is removed from the main body housing 12. This prevents the battery pack BP from coming off the main body housing 12 due to its own weight. The battery terminal 108 is inclined with respect to a plane perpendicular to the reference plane P. The inclination angle is equal to or less than 45 degrees. This allows the user to remove the battery pack BP from the main body housing 12 without holding the main body housing 12 with his / her hands.

[0188] As shown in FIG. 48, the motor unit 4 can be fixed to the working unit 6 via the screw hole 37 of the main body housing 12 in addition to being fixed to the flange portion 186 and the working unit 6. The working unit 6 is provided with a first coupler 350. The first coupler 350 abuts against the rear wall 30 of the main body housing 12. The first coupler 350 has an insertion hole 352. The insertion hole 352 penetrates the first coupler 350 in the front-rear direction. The insertion hole 352 faces the screw hole 37 in the front-rear direction. The motor unit 4 is fixed to the first coupler 350 by inserting a screw 354 into the insertion hole 352 and screwing it into the screw hole 37. This makes the motor unit 4 more firmly fixed to the working unit 6. In a modified example, the motor unit 4 may be fixed to the working unit 6 via the screw hole 37 and the screw 354, without using the first coupler 350.

[0189] As shown in FIG. 49, the motor unit 4 can be fixed to the working unit 6 via the first screw boss portion 190 of the mount base 172 in addition to being fixed to the flange portion 186 and the working unit 6. The working unit 6 is provided with a second coupler 360. The second coupler 360 abuts against the lower surface of the cylindrical portion 190a of the first screw boss portion 190. The second coupler 360 has an insertion hole 362. The insertion hole 362 penetrates the second coupler 360 in the vertical direction. The insertion hole 362 faces the screw hole 190b in the vertical direction. The motor unit 4 is fixed to the second coupler 360 by inserting a screw 364 into the insertion hole 362 and screwing it into the screw hole 190b. This allows the motor unit 4 to be more firmly fixed to the working unit 6. In a modified example, the motor unit 4 may be fixed to the working unit 6 via the screw hole 190b and the screw 364, without using the second coupler 360. Also, in a modified example, the motor unit 4 may be fixed to the working unit 6 via both the screw hole 37 of the main body housing 12 and the first screw boss portion 190, in addition to being fixed between the flange portion 186 and the working unit 6.

[0190] (effect) The motor unit 4 of this embodiment operates the working unit 6. The motor unit 4 includes a right body housing 14 (an example of a first housing) and a left body housing 16 (an example of a second housing), and includes a body housing 12 in which an accommodation space 17 is defined between the right body housing 14 and the left body housing 16, and the right body housing 14 and the left body housing 16 define the overall external shape of the body housing 12, a motor 112 arranged in the accommodation space 17, an output unit 116 that can be fixed to the working unit 6 and operates the working unit 6 when the motor 112 operates, a battery terminal 108 that is exposed to the outside of the body housing 12 and can be connected to a battery pack BP (an example of a battery) that supplies power to the motor 112, and a control unit 106 that is arranged in the accommodation space 17 and controls the motor 112.

[0191] According to the above configuration, the outer shape of the main body housing 12 is defined by two housings, the right main body housing 14 and the left main body housing 16. The two housings are used when the motor 112 is a low-power motor that is lighter than a high-power motor. For this reason, the motor unit 4 can be used for a low-power working unit 6.

[0192] The motor unit 4 further includes a motor housing 110 that accommodates a motor 112 and is disposed in the accommodation space 17. The motor housing 110, the battery terminals 108, and the control unit 106 are sandwiched between the right body housing 14 and the left body housing 16, respectively.

[0193] The above configuration eliminates the need for additional components to support the motor housing 110, the battery terminals 108, and the control unit 106.

[0194] In addition, the motor 112 is disposed between the battery terminals 108 and the control unit 106 .

[0195] According to the above configuration, the space between the battery terminal 108 and the control unit 106 can be effectively utilized.

[0196] The motor 112 is also provided with a motor shaft 158 ​​extending in the front-rear direction. The motor 112 is disposed forward of the center position of the control unit 106 in the front-rear direction and the center position of the battery terminal 108 in the front-rear direction.

[0197] According to the above configuration, the wiring can be arranged in the space behind the motor 112 and between the battery terminal 108 and the control unit 106.

[0198] Further, the center of gravity G1 of the motor unit 4 is disposed within the motor 112.

[0199] According to the above configuration, tilting of the motor unit 4 due to vibration of the motor 112 can be suppressed.

[0200] Moreover, the diameter DA1 of the motor 112 is 100 mm or less.

[0201] According to the above configuration, the motor 112 can be made smaller, and therefore the motor unit 4 can be made smaller.

[0202] The motor 112 is also provided with a motor shaft 158 ​​extending in the front-rear direction. The length L4 of the main body housing 12 in the front-rear direction is 1.5 to 2.0 times the length L3 of the motor 112 in the front-rear direction.

[0203] According to the above configuration, the motor unit 4 can be made smaller.

[0204] The motor unit 4 is further provided with a cooling fan 114 that is disposed in the accommodation space 17 and rotates together with the motor 112. The main body housing 12 has an intake port 80 that communicates between the accommodation space 17 and the outside of the main body housing 12, a first exhaust port 92, and a second exhaust port 94 (an example of an exhaust port).

[0205] According to the above configuration, the motor 112, the battery terminal 108, and the control unit 106, which are heat-generating components, can be cooled.

[0206] The motor unit 4 further includes a motor housing 110 that accommodates a motor 112 and is disposed in the accommodation space 17. The motor housing 110 has a motor air inlet 146 that is disposed between the battery terminal 108 and the control unit 106.

[0207] According to the above configuration, the battery terminals 108 and the control unit 106 can be simultaneously cooled by air flowing toward the motor intake port 146. This allows the cooling path to be shorter than in a configuration in which the battery terminals 108 and the control unit 106 are cooled separately.

[0208] The main housing 12 also has a lower wall 24 that contacts the reference surface P when the motor unit 4 is placed on the reference surface P, and a rear upper wall 26 (an example of an upper wall) opposite the lower wall 24 and on which the battery terminal 108 is located.

[0209] The motor unit 4 may be used, for example, in rainy weather. Therefore, the reference surface P may be wet with liquid, for example, rainwater. With the above configuration, it is possible to prevent the rainwater on the reference surface P from coming into contact with the battery terminal 108.

[0210] Furthermore, when the motor unit 4 is placed on the reference surface P, the upper surface 26a of the upper rear wall 26 is inclined with respect to the reference surface P. When the motor unit 4 is placed on the reference surface P, the battery pack BP is connected to the battery terminal 108 when it slides on the upper surface 26a in a direction D1 away from the reference surface P, and is disconnected from the battery terminal 108 when it slides on the upper surface 26a in a direction D2 approaching the reference surface P.

[0211] The motor unit 4 may be used, for example, in rainy weather. According to the above configuration, even if liquid, for example, rainwater, hits the upper surface 26a of the rear upper wall 26, the rainwater on the upper surface 26a of the rear upper wall 26 can be easily guided toward the reference plane P.

[0212] When the motor unit 4 is placed on the reference plane P, the inclination angle B of the upper surface 26a of the upper rear wall 26 with respect to the reference plane P is equal to or greater than 5 degrees and equal to or less than 45 degrees.

[0213] According to the above configuration, the liquid on the upper surface 26a of the upper rear wall 26 can be guided toward the reference surface P more easily.

[0214] Furthermore, the main housing 12 is made of a resin material.

[0215] According to the above-mentioned configuration, the weight of the motor unit 4 can be reduced compared to a configuration in which the main body housing 12 is made of a metal material.

[0216] Moreover, the motor unit 4 of this embodiment operates the working unit 6. The motor unit 4 includes a main body housing 12 having an accommodation space 17 therein, a motor 112 arranged in the accommodation space 17, an output unit 116 that can be fixed to the working unit 6 and operates the working unit 6 when the motor 112 operates, a battery terminal 108 that is exposed to the outside of the main body housing 12 and can be connected to a battery pack BP (an example of a battery) that supplies power to the motor 112, and a control unit 106 that is arranged in the accommodation space 17 and controls the motor 112. The maximum output value of the motor 112 is 0.5 kW to 1.5 kW.

[0217] According to the above configuration, the motor 112 having a maximum output value of 0.5 kW to 2.0 kW, for example, the motor 112 having a maximum output value of 0.5 kW to 1.5 kW, is usually used to operate a low-output working unit 6. For this reason, the motor unit 4 can be used for a low-output working unit 6.

[0218] Furthermore, the weight of the motor unit 4 is 7.5 kg or less.

[0219] Generally, the higher the maximum output value of the motor 112, the larger the motor 112. With the above configuration, the weight of the motor unit 4 can be reduced compared to when a high-output motor 112 is used. This allows the weight of the working unit 6 to which the motor unit 4 is attached to be reduced.

[0220] In addition, the volume of the main body housing 12 is 13000 cm 3 The following is the result.

[0221] Generally, the higher the maximum output value of the motor 112, the larger the motor 112. Accordingly, the main body housing 12 also becomes larger. With the above configuration, the main body housing 12 can be made smaller than when a high-output motor 112 is used. As a result, the motor unit 4 can be made smaller.

[0222] The motor unit 4 of this embodiment operates the working unit 6. The motor unit 4 includes a main body housing 12 having an accommodation space 17 therein, a motor 112 arranged in the accommodation space 17, an output unit 116 that can be fixed to the working unit 6 and operates the working unit 6 when the motor 112 operates, a battery terminal 108 that is exposed to the outside of the main body housing 12 and can be connected to a battery pack BP (an example of a battery) that supplies power to the motor 112, and a control unit 106 that is arranged in the accommodation space 17 and controls the motor 112. The maximum output value of the motor 112 is 0.5 kW to 2.0 kW. The torque of the motor 112 is 1.5 N·m to 3.0 N·m. The rotation speed of the motor 112 is 4000 rpm to 10000 rpm.

[0223] According to the above configuration, the motor 112 having a maximum output value of 0.5 kW to 2.0 kW is usually used to operate a low-output type working unit 6. Therefore, the motor unit 4 can be used for a low-output type working unit 6.

[0224] The working machine 8 of this embodiment also includes a working unit 6 and a motor unit 4 that operates the working unit 6. The motor unit 4 includes a right body housing 14 (an example of a first housing) and a left body housing 16 (an example of a second housing), a body housing 12 in which an accommodation space 17 is defined between the right body housing 14 and the left body housing 16, and the right body housing 14 and the left body housing 16 define the overall external shape of the body housing 12, a motor 112 arranged in the accommodation space 17, an output unit 116 that can be fixed to the working unit 6 and operates the working unit 6 when the motor 112 operates, a battery terminal 108 that is exposed to the outside of the body housing 12 and can be connected to a battery pack BP (an example of a battery) that supplies power to the motor 112, and a control unit 106 that is arranged in the accommodation space 17 and controls the motor 112.

[0225] According to the above configuration, the same effects as those of the motor unit 4 can be achieved.

[0226] (Second Example) In the second embodiment, differences from the first embodiment will be described. In the following, the direction in which the motor shaft 158 ​​extends is the front-rear direction, the direction perpendicular to the front-rear direction is the left-right direction, and the direction perpendicular to the front-rear direction and the left-right direction is the up-down direction.

[0227] As shown in FIG. 50, in the second embodiment, the control unit 106 is disposed in the motor accommodating section 100. The control unit 106 includes a first control board 400 and a second control board 402. Each of the first control board 400 and the second control board 402 has a microcomputer and a plurality of switching elements. The first control board 400 and the second control board 402 extend along the up-down direction. The first control board 400 and the second control board 402 extend along the rear wall 30. The first control board 400 and the second control board 402 are arranged side by side in the front-rear direction. The first control board 400 and the second control board 402 are disposed on the rear side of the motor housing 110. When the motor unit 4 is viewed from the rear side, the first control board 400 at least partially overlaps with each of the second control board 402 and the motor housing 110, and the second control board 402 at least partially overlaps with the motor housing 110.

[0228] When the battery pack BP is attached to the main body housing 12, the center of gravity G1 of the motor unit 4 is located inside the motor 112. The center of gravity G1 is located forward of the center position of the main body housing 12 in the front-rear direction. The center of gravity G1 is located above the rotation axis AX of the motor shaft 158.

[0229] When the battery pack BP is not attached to the main body housing 12, the center of gravity G2 of the motor unit 4 is disposed within the motor 112. The center of gravity G2 is disposed forward of the center of gravity G1. The center of gravity G2 is disposed above the rotation axis AX of the motor shaft 158. The center of gravity G2 is disposed closer to the rotation axis AX than the center of gravity G1.

[0230] (Third Example) In the third embodiment, differences from the first embodiment will be described. As shown in Fig. 51, in the third embodiment, the battery pack BP is attached to the rear wall 30 of the main body housing 12. Hereinafter, the battery pack BP shown in Fig. 51 may be referred to as battery pack BP3. In the battery pack BP3, the maximum voltage value is 40V and the rated capacity is 5.0Ah.

[0231] 52, the right rail 38, the left rail 40, and the connecting wall 42 are disposed on the rear wall 30. The right rail 38 extends in a generally vertical direction above the right end of the rear wall 30. The left rail 40 extends in a generally vertical direction above the left end of the rear wall 30. The connecting wall 42 connects the lower end of the right rail 38 and the lower end of the left rail 40.

[0232] The battery terminal 108 is disposed on the rear wall 30. The outer surface 128a of the terminal base 128 is disposed along a plane including the up-down direction and the left-right direction. The outer surface 128a corresponds to the rear surface of the terminal base 128. As shown in FIG. 53, the battery terminal 108 is disposed on the rear side of the motor housing 110. When the motor unit 4 is viewed in the forward direction, the battery terminal 108 at least partially overlaps with each of the motor housing 110 and the motor 112. The battery terminal 108 is disposed on the rotation axis AX of the motor shaft 158. The battery terminal 108 is disposed on the upper side of the control unit 106. When the motor unit 4 is viewed in the downward direction, the battery terminal 108 at least partially overlaps with the control unit 106.

[0233] When the battery pack BP is slid downward from the upper side of the main body housing 12, the battery pack BP is attached to the main body housing 12. When the battery pack BP is attached, the user can slide the battery pack BP upward while pressing in the operating portion 68 of the battery pack BP, thereby removing the battery pack BP from the main body housing 12. This prevents the battery pack BP from coming off the main body housing 12 due to its own weight.

[0234] When the battery pack BP is attached to the main body housing 12, the center of gravity G1 of the motor unit 4 is located rearward of the motor housing 110. The center of gravity G1 is located rearward of the center position in the front-rear direction of the main body housing 12 and the center position in the front-rear direction of the control unit 106. The center of gravity G1 is located above the rotation axis AX of the motor shaft 158. In the vertical direction, the center of gravity G1 is located between the upper end and the lower end of the battery terminal 108.

[0235] When the battery pack BP is not attached to the main body housing 12, the center of gravity G2 of the motor unit 4 is located near the rear end of the motor housing 110. The center of gravity G2 is located forward of the center of gravity G1. The center of gravity G2 is located above the rotation axis AX of the motor shaft 158. The center of gravity G2 is located closer to the rotation axis AX than the center of gravity G1.

[0236] (Fourth Example) In the fourth embodiment, differences from the first embodiment will be described. As shown in Fig. 54, in the fourth embodiment, the battery pack BP is attached to the front upper wall 28 of the main body housing 12. Hereinafter, the battery pack BP shown in Fig. 54 may be referred to as battery pack BP3. In the battery pack BP3, the maximum voltage value is 40V and the rated capacity is 5.0Ah.

[0237] 55, the right rail 38, the left rail 40, and the connecting wall 42 are disposed on the front upper wall 28. The right rail 38 extends in a generally vertical direction above the right end of the front upper wall 28. The left rail 40 extends in a generally vertical direction above the left end of the front upper wall 28. The connecting wall 42 connects the front end of the right rail 38 and the front end of the left rail 40.

[0238] The battery terminal 108 is disposed on the front upper wall 28. An outer surface 128a of the terminal base 128 is disposed along a plane including the front-rear direction and the left-right direction. The outer surface 128a corresponds to the upper surface of the terminal base 128. As shown in FIG. 56 , the battery terminal 108 is disposed on the upper side of the motor housing 110. The battery terminal 108 is disposed forward of the rear end of the motor housing 110 and the rear end of the motor 112. When the motor unit 4 is viewed in the forward direction, the battery terminal 108 at least partially overlaps with each of the motor housing 110 and the motor 112.

[0239] When the battery pack BP is slid forward from the rear side of the main body housing 12, the battery pack BP is attached to the main body housing 12. When the battery pack BP is attached to the main body housing 12, a space 500 is defined between the rear lower part of the battery pack BP and the rear upper wall 26. The battery pack BP is removed from the main body housing 12 by a user gripping the battery pack BP with his / her fingers inserted into the space 500 and sliding the battery pack BP backward while pressing the operating portion 68.

[0240] When the battery pack BP is attached to the main body housing 12, the center of gravity G1 of the motor unit 4 is disposed within the motor housing 110. The center of gravity G1 is disposed near the center position of the main body housing 12 in the front-rear direction. The center of gravity G1 is disposed above the motor 112. The center of gravity G1 is disposed above the rotation axis AX of the motor shaft 158.

[0241] When the battery pack BP is not attached to the main body housing 12, the center of gravity G2 of the motor unit 4 is disposed within the motor 112. The center of gravity G2 is disposed near the center position of the main body housing 12 in the front-rear direction. The center of gravity G2 is disposed above the rotation axis AX of the motor shaft 158, whereas the center of gravity G1 is disposed closer to the rotation axis AX than the center of gravity G1.

[0242] (Modification) The motor unit 4 according to one embodiment may include a built-in battery arranged in the accommodation space 17, instead of the battery pack BP. In this case, the battery is charged from an external power source via a power cord.

[0243] The motor unit 4 according to an embodiment may not include the battery pack BP. In this case, power may be supplied to the motor unit 4 from an external power source via a power cord.

[0244] In the motor unit 4 according to one embodiment, the centers of gravity G1 and G2 do not have to be located within the motor 112.

[0245] The main body housing 12 according to one embodiment does not have to include the circuit board accommodating portion 98. In this case, the control unit 106 is disposed in the motor accommodating portion 100.

[0246] The motor unit 4 according to one embodiment may be fixed to the working unit 6 at a portion other than the front surface 186a of the flange portion 186. [Explanation of symbols]

[0247] 2: System 4: Motor unit 6: Unit of Work 6a: Winch 6c: Slope mower 6d: Brushcutter 6e:Screed 6f: Trowell 6g: Ranma 6h: Plate compactor 6i: Handheld brush cutter 6j: Edger 6k: Management machine 8: Work equipment 12: Main housing 14: Right body housing 16: Left body housing 17: Containment space 20: Right wall 22: Left wall 24: Lower wall 26: Posterior upper wall 26a:Top surface 28: Anterior upper wall 30: Back wall 38: Right rail 40: Left rail 42: Connecting wall 43 :Aperture 52: Battery housing 62: Battery intake 64: Battery exhaust vent 76: Intake cover 78: Intake port 80: Air intake 86: Intake path 88: First exhaust port 90: Second exhaust port 92: First exhaust port 94: Second exhaust port 98: Substrate storage section 100: Motor housing 102: Battery mounting part 106: Control unit 108: Battery terminal 110: Motor housing 112: Motor 114: Cooling fan 116: Output unit 120: Control board 140: Motor housing body 142: Baffle plate 146: Motor intake 158: Motor shaft 166: First motor exhaust port 168: Second motor exhaust port 172: Mount base 176: First clutch shoe 178: Second clutch shoe 186: Flange part 186a: Front 208: Spindle 212: First output section 214: Second output section 216: Output section 232: Handle unit 234: Fixed unit 236: Transmission shaft 238:Working section 246: Trigger 268 :Kariblade 280: Backpack battery 284: Adapter 294: Handle unit 294c :Trigger 296: Working section 296a: Blade 304: Handle 306:Working department 308: Operation switch 326: Handle unit 328:Working department 336: Trigger 344: Blade 350: 1st coupler 352: Insertion hole 354: Screw 360: 2nd coupler 362: Insertion hole 400: First control board 402: Second control board A, B: Inclination angle AX: Rotation axis B: Inclination angle BP: Battery pack D1: 1st direction D2 :Second direction DA1: Diameter G1, G2: Center of gravity L1, L2, L3, L4, L5, L6, L7: Length LW1: Lead wire No. 1 LW2: Second lead wire LW3: Lead wire No. 3 P: Reference plane P1: Surface

Claims

1. A motor unit for operating a work unit, A main housing comprising a first housing and a second housing, wherein a housing space is defined between the first housing and the second housing, and the first housing and the second housing define the overall external shape of the main housing, A motor arranged in the aforementioned housing space, An output unit which can be fixed to the aforementioned work unit and which operates the work unit when the motor is operating, The battery terminal is exposed to the outside of the main housing and is connectable to a battery that supplies power to the motor, A motor unit comprising a control unit that is located in the aforementioned housing space and controls the motor.

2. The motor is housed in the aforementioned motor, and the motor housing is further provided in the aforementioned housing space, The motor unit according to claim 1, wherein the motor housing, the battery terminal, and the control unit are each sandwiched between the first housing and the second housing.

3. The motor unit according to claim 1, wherein the motor is located between the battery terminal and the control unit.

4. The motor is equipped with a motor shaft that extends in the front-rear direction. The motor unit according to claim 3, wherein the motor is positioned in front of the center position of the control unit in the front-rear direction and the center position of the battery terminal in the front-rear direction.

5. The motor unit according to claim 1, wherein the center of gravity of the motor unit is located within the motor.

6. The motor unit according to claim 1, wherein the diameter of the motor is 100 mm or less.

7. The motor is equipped with a motor shaft that extends in the front-rear direction. The motor unit according to claim 1, wherein the length of the main housing in the front-to-rear direction is 1.5 times or more and 2.0 times or less the length of the motor in the front-to-rear direction.

8. The aforementioned housing space is further equipped with a cooling fan that rotates together with the motor, The motor unit according to claim 1, wherein the main housing has an intake port and an exhaust port that connect the housing space to the outside of the main housing.

9. The motor is housed in the aforementioned motor, and the motor housing is further provided in the aforementioned housing space, The motor unit according to claim 8, wherein the motor housing has a motor air intake port located between the battery terminal and the control unit.

10. The main housing is When the motor unit is placed on the reference surface, the lower wall that contacts the reference surface, The motor unit according to claim 1, further comprising an upper wall opposite to the lower wall, on which the battery terminals are located.

11. When the motor unit is placed on the reference surface, the upper surface of the upper wall is inclined with respect to the reference surface. The motor unit according to claim 10, wherein when the motor unit is placed on the reference surface, the battery is connected to the battery terminal when it slides on the upper surface in a direction away from the reference surface, and is disconnected from the battery terminal when it slides on the upper surface in a direction toward the reference surface.

12. The motor unit according to claim 11, wherein when the motor unit is placed on the reference surface, the inclination angle of the upper surface of the upper wall with respect to the reference surface is 5 degrees or more and 45 degrees or less.

13. The motor unit according to any one of claims 1 to 12, wherein the main body housing is made of a resin material.

14. A motor unit for operating a work unit, The main housing has an internal storage space, A motor arranged in the aforementioned housing space, An output unit which can be fixed to the aforementioned work unit and which operates the work unit when the motor is operating, The battery terminal is exposed to the outside of the main housing and is connectable to a battery that supplies power to the motor, It comprises a control unit located in the aforementioned housing space and controlling the motor, The motor unit has a maximum output value of 0.5 kW to 1.5 kW.

15. The motor unit according to claim 14, wherein the weight of the motor unit is 7.5 kg or less.

16. The volume of the main housing is 13,000 cm³ ３ The motor unit according to claim 14 or 15, which is as follows:

17. A motor unit for operating a work unit, The main housing has an internal storage space, A motor arranged in the aforementioned housing space, An output unit which can be fixed to the aforementioned work unit and which operates the work unit when the motor is operating, The battery terminal is exposed to the outside of the main housing and is connectable to a battery that supplies power to the motor, It comprises a control unit located in the aforementioned housing space and controlling the motor, The maximum output value of the aforementioned motor is between 0.5 kW and 2.0 kW. The torque of the aforementioned motor is 1.5 N·m to 3.0 N·m. A motor unit having a rotational speed of 4,000 rpm to 10,000 rpm.

18. Work unit and It comprises a motor unit for operating the aforementioned work unit, The motor unit is A main housing comprising a first housing and a second housing, wherein a housing space is defined between the first housing and the second housing, and the first housing and the second housing define the overall external shape of the main housing, A motor arranged in the aforementioned housing space, An output unit which can be fixed to the aforementioned work unit and which operates the work unit when the motor is operating, The battery terminal is exposed to the outside of the main housing and is connectable to a battery that supplies power to the motor, A work machine comprising a control unit that controls the motor and is located in the aforementioned storage space.

Images