MOTOR UNIT

Abstract

A motor unit may comprise: a motor having a motor shaft (140) extending in a first direction; a body housing arranged on an outer side of a control circuit board and a motor housing; a first fixing element (148) configured to be fixed to a working unit; and a first and a second vibration-damping element (170) arranged between the body housing and the motor housing. The first fixing element is placed on a placement surface when the motor unit is placed on the placement surface. In a top-bottom direction perpendicular to the placement surface, at least a portion of the first vibration-damping element and at least a portion of the second vibration-damping element may be arranged under an upper end of the motor when the motor unit is placed on the placement surface.When the motor unit is viewed along the first direction, the motor can be positioned between the first and the second vibration-resistant component.

Description

TECHNICAL FIELD

[0001] This disclosure herein relates to a motor unit. BACKGROUND

[0002] WO 2020 / 049617 A1 describes a motor unit. The motor unit is designed to be removably attached to a working unit for driving the working unit.The motor unit includes a motor having a motor shaft extending in a first direction and configured to drive the working unit, a control circuit board configured to drive the motor, a motor housing supporting the motor, a body housing disposed on an outer side of the control circuit board and the motor housing, a first fixing part configured to be fixed to the working unit, a first vibration-proof member disposed between the body housing and the motor housing, a second vibration-proof member disposed between the body housing and the motor housing, and a third vibration-proof member disposed between the body housing and the motor housing.The first fixing part is configured to be placed on a placement surface when the motor unit is placed on the placement surface and is arranged substantially parallel to the motor shaft. SUMMARY

[0003] In the above motor unit, the arrangement of the first, second, and third vibration-proof components is asymmetrical with respect to the motor. In this case, motor vibration cannot be adequately dampened.

[0004] In the motor unit described above, it is necessary to define a flow space using a component(s) other than the first to third vibration-proof components for cooling the control circuit board. As a result, the number of parts in the motor unit increases.

[0005] The description herein aims to provide at least one of an engine unit configured to sufficiently dampen engine vibration and an engine unit configured to reduce the number of parts in the engine unit while dampening engine vibration.

[0006] A motor unit disclosed herein may be configured to be detachably attached to a working unit for driving the working unit. The motor unit may include: a motor having a motor shaft extending in a first direction and configured to drive the working unit; a control circuit board (control board) configured to drive the motor; a motor housing supporting the motor; a body housing disposed on an outer side of the control circuit board and the motor housing; a first fixing part configured to be fixed to the working unit; a first vibration-proof (vibration-resistant / impermeable / damping) member disposed between the body housing and the motor housing; and a second vibration-proof member disposed between the body housing and the motor housing.The first fixing part may be configured to be placed on a placement surface when the motor unit is placed on the placement surface, the first fixing part being arranged substantially parallel to the motor shaft. In an up-down direction perpendicular to the placement surface, at least a part of the first vibration-proof member and at least a part of the second vibration-proof member may be arranged below an upper end of the motor when the motor unit is placed on the placement surface. When the motor unit is viewed along the first direction, the motor may be arranged between the first vibration-proof member and the second vibration-proof member.

[0007] According to the above configuration, at least a portion of the first vibration-proof member and at least a portion of the second vibration-proof member are disposed below the upper end of the engine, and the first and second vibration-proof members are arranged with the engine between them. As a result, the first and second vibration-proof members are positioned symmetrically with respect to the engine. This allows the vibration of the engine to be sufficiently dampened.

[0008] Another motor unit disclosed herein may be configured to be detachably attached to a working unit for driving the working unit. The motor unit may include: a motor having a motor shaft extending in a first direction and configured to drive the motor unit; a control circuit board configured to drive the motor; a motor housing supporting the motor; a body housing disposed on an outer side of the control circuit board and the motor housing; a second fixing part configured to be fixed to the working unit; a first vibration-proof member disposed between the body housing and the motor housing; and a second vibration-proof member disposed between the body housing and the motor housing. The motor shaft may be substantially perpendicular to the second fixing part.In a top-down direction perpendicular to a placement surface, at least a portion of the first vibration-proof component and at least a portion of the second vibration-proof component may be disposed below an upper end of the motor when the motor unit is placed on the placement surface. When the motor unit is viewed along the first direction, the motor may be disposed between the first vibration-proof component and the second vibration-proof component.

[0009] According to the above configuration, at least a portion of the first vibration-proof member and at least a portion of the second vibration-proof member are positioned below the upper end of the engine, and the first and second vibration-proof members are positioned with the engine between them. As a result, the first and second vibration-proof members are positioned symmetrically with respect to the engine. This allows the vibration of the engine to be sufficiently dampened.

[0010] Another motor unit disclosed herein may be configured to be detachably attached to a working unit for driving the working unit. The motor unit may include: a motor having a motor shaft extending in a first direction and configured to drive the working unit; a control circuit board configured to drive the motor; a fan fixed to the motor; a motor housing supporting the motor; a plate housing supporting the control circuit board; a body housing disposed on an outer side of the motor housing and the plate housing; a fixing unit configured to be fixed to the working unit; and a tubular vibration-proof member disposed between the motor housing and the plate housing and having a tubular shape.When the fan rotates, air can cool the control circuit board and flows inside the tubular vibration-proof component.

[0011] According to the above configuration, when the motor vibrates, the tubular vibration-proof component dampens the motor vibration. Furthermore, air that cools the control circuit board flows inside the tubular vibration-proof component. Using the tubular vibration-proof component, the motor vibration can be suppressed and the control circuit board can be cooled with only one component. This reduces the number of parts in the motor unit. SHORT DESCRIPTION OF DRAWINGS Fig. 1 shows a system 1 of a first embodiment. Fig. 2 shows a perspective view of a motor unit 10 and a rammer 4a of the first embodiment. Fig. 3 shows a perspective view of the motor unit 10 and a vibrating plate 4b of the first embodiment. Fig. 4 shows a perspective view of the motor unit 10 and battery packs BP of the first embodiment. Fig. 5 is a table showing specifications of the motor unit 10, a body case 12, a motor 86, and the battery packs BP of the first embodiment. Fig. 6 shows a perspective view of the motor unit 10 and battery pack BP of the first embodiment. Fig. 7 is a perspective view of a first battery receptacle (battery socket) 22 and a second battery receptacle 24 and a surrounding portion thereof in the motor unit 10 of the first embodiment. Fig. 8 shows a cross-sectional view of a first battery pack BP1 and a second battery pack BP2 and a surrounding area thereof in the motor unit 10 of the first embodiment. Fig. 9 is a table showing specifications of the motor 86 and the battery packs BP of the first embodiment. Fig. 10 shows a perspective view of the battery pack BP of the first embodiment. Fig. 11 shows a cross-sectional view of the first battery receptacle 22 and the first battery pack BP1 and a surrounding area thereof in the motor unit 10 of the first embodiment. Fig. 12 shows an exploded perspective view of the motor unit 10 of the first embodiment. Fig. 13 shows a cross-sectional view of the motor unit 10 and a battery pack BP of the first embodiment. Fig. 14 shows a perspective view of a motor housing 84 and the motor 86 of the first embodiment. Fig. 15 shows a cross-sectional view of a region surrounding an air inlet 26a in the engine unit 10 of the first embodiment. Fig. 16 shows a cross-sectional view of the motor housing 84, the motor 86 and a fan 88 of the first embodiment. Fig. 17 shows an exploded perspective view of the motor housing 84, the motor 86 and a plate member 92 of the first embodiment. Fig. 18 shows an exploded perspective view of the motor unit 10 of the first embodiment in which the body case 12 and a support unit 100 are removed. Fig. 19 shows an exploded perspective view of the motor unit 10 of the first embodiment in which the body case 12 and the support unit 100 are removed. Fig. 20 shows a right side view of the motor unit 10 of the first embodiment in which the body case 12 and the support unit 100 are removed. Fig. 21 is a left side view of the motor unit 10 of the first embodiment in which the body case 12 and the support unit 100 are removed. Fig. 22 shows a cross-sectional view of the motor unit 10 of the first embodiment. Fig. 23 shows a front view of the motor unit 10 of the first embodiment in which the body case 12 is removed. Fig. 24 shows an exploded perspective view of the motor unit 10 of the first embodiment in which the body case 12 is removed. Fig. 25 shows an exploded perspective view of the motor unit 10 of the first embodiment in which the body case 12 is removed. Fig. 26 shows a cross-sectional view of a region surrounding a control unit 102 in the motor unit 10 of the first embodiment. Fig. 27 shows a left side view of the motor unit 10 and the rammer 4a of the first embodiment. Fig. Fig. 28 shows a front view of the motor housing 84, the motor 86 and a fixing unit 90 of the first embodiment. Fig. 29 is a perspective view of the rammer 4a of the first embodiment near a fixing platform 308. Fig. 30 shows an exploded perspective view of the motor unit 10 and the rammer 4a of the first embodiment. Fig. 31 shows a left side view of the motor unit 10 and the vibrating plate 4b of the first embodiment. Fig. 32 shows an exploded perspective view of a first fixing part 148 and the vibrating plate 4b of the first embodiment. Fig. 33 shows a side view of the engine unit 10 and a slope mower 4c of the first embodiment. Fig. 34 shows a perspective view of a motor unit 10 and battery packs BP of a second embodiment. Fig. 35 shows a perspective view of a motor unit 10 and battery packs BP of a third embodiment. Fig. 36 shows a right side view of a motor unit 10 of a fourth embodiment in which a body case 12 and a support unit 100 are removed. Fig. 37 shows a right side view of a motor unit 10 of a fifth embodiment in which a body case 12 and a support unit 100 are removed. DESCRIPTION OF EMBODIMENTS

[0012] Representative, non-limiting examples of the present disclosure will now be described in further detail with reference to the accompanying drawings. This detailed description is merely intended to teach a person skilled in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the present disclosure. Furthermore, each of the additional features and teachings described below may be used separately or in conjunction with other features and teachings to provide improved engine assemblies, and methods of using and manufacturing the same.

[0013] Furthermore, combinations of features and steps disclosed in the following detailed description may not be necessary for practicing the present disclosure in the broadest sense, and are instead taught merely to specifically describe representative examples of the present disclosure. Furthermore, various features of the representative examples described above and below, as well as the various independent and dependent claims, may be combined to provide additional useful embodiments of the present teachings in ways not specifically and explicitly enumerated.

[0014] All features disclosed in the description and / or claims are intended to be disclosed separately and independently of each other for the purpose of original written disclosure and for the purpose of limiting the claimed subject matter, regardless of the combinations of features in the embodiments and / or the claims. Furthermore, all ranges of values ​​or indications of groups of objects are intended to disclose any possible intermediate value or object for the purpose of original written disclosure and for the purpose of limiting the claimed subject matter.

[0015] A motor unit disclosed herein may be configured to be detachably attached to a working unit for driving the working unit. The motor unit may include: a motor having a motor shaft extending in a first direction and configured to drive the working unit; a control circuit board configured to drive the motor; a motor housing supporting the motor; a body housing disposed on an outer side of the control circuit board and the motor housing; a first fixing part configured to be fixed to the working unit; a first vibration-proof member disposed between the body housing and the motor housing; and a second vibration-proof member disposed between the body housing and the motor housing.The first fixing part may be configured to be placed on a placement surface when the motor unit is placed on the placement surface, the first fixing part being arranged substantially parallel to the motor shaft. In an up-down direction perpendicular to the placement surface, at least a part of the first vibration-proof member and at least a part of the second vibration-proof member may be arranged below an upper end of the motor when the motor unit is placed on the placement surface. When the motor unit is viewed along the first direction, the motor may be arranged between the first vibration-proof member and the second vibration-proof member.

[0016] In one or more embodiments, the motor shaft may extend along the placement surface when the motor unit is placed on the placement surface. The first vibration-proof component and the second vibration-proof component may be arranged below a central axis of the motor shaft when the motor unit is placed on the placement surface.

[0017] Generally, a component(s) of the motor unit is often arranged in the space above the top of the motor. According to the above configuration, available space below the center axis of the motor shaft can be utilized.

[0018] In one or more embodiments, the first vibration-proof component and the second vibration-proof component may be disposed over a lower end of the motor when the motor unit is placed on the placement surface.

[0019] According to the above configuration, the available space between the center axis of the motor shaft and the bottom end of the motor can be utilized.

[0020] In one or more embodiments, the first vibration-proof component may be a first distance from a vertical plane perpendicular to the placement surface and including the first direction. The second vibration-proof component may be the first distance from the vertical plane.

[0021] According to the above configuration, the distance between the first vibration-proof component and the vertical plane is the same as the distance between the second vibration-proof component and the vertical plane. Therefore, the first and second vibration-proof components are arranged symmetrically with respect to the vertical plane. This allows the vibration of the motor to be more dampened.

[0022] In one or more embodiments, a position of a center of gravity of the motor unit in the first direction may be substantially the same as each of a center position of the first vibration-proof member in the first direction and a center position of the second vibration-proof member in the first direction.

[0023] According to the above configuration, the vibration of the engine can be more dampened.

[0024] In one or more embodiments, the motor unit may further include: a third vibration-proof member disposed between the body casing and the motor casing; and a fourth vibration-proof member disposed between the body casing and the motor casing. At least a portion of the third vibration-proof member and at least a portion of the fourth vibration-proof member may be disposed above the center axis of the motor shaft when the motor unit is placed on the placement surface. When the motor unit is viewed along the first direction, the motor may be disposed between the third vibration-proof member and the fourth vibration-proof member.

[0025] According to the above configuration, the vibration of the motor can be more damped compared to a configuration in which the motor unit has only the first vibration-proof member and the second vibration-proof member.

[0026] In one or more embodiments, the third vibration-proof component may be arranged on the same side as the first vibration-proof component relative to a vertical plane perpendicular to the placement surface and including the first direction. The fourth vibration-proof component may be arranged on the same side as the second vibration-proof component relative to the vertical plane. A distance between the first vibration-proof component and the third vibration-proof component may be substantially the same as a distance between the second vibration-proof component and the fourth vibration-proof component.

[0027] According to the above configuration, the third and fourth vibration-proof components are arranged symmetrically with respect to the vertical plane. This allows for more dampening of the engine vibration.

[0028] In one or more embodiments, the motor unit may further include a plate member fixed to the motor housing. The first vibration-proof member and the second vibration-proof member may be fixed to the plate member and the body housing.

[0029] In a configuration in which the first and second vibration-proof components are directly fixed to the motor housing, the configuration of the motor housing becomes complicated. According to the above configuration, the configuration of the motor housing can be suppressed from becoming complicated.

[0030] In one or more embodiments, the motor unit may further comprise a second fixing part configured to be fixed to a working unit of a different type from the working unit fixed to the first fixing part.

[0031] According to the above configuration, the number of types of working units adapted to use the motor unit can be increased.

[0032] In one or more embodiments, the motor unit may further include: a fan fixed to the motor; a plate housing supporting the control circuit board; and a tubular vibration-proof component disposed between the motor housing and the plate housing and having a tubular shape. As the fan rotates, air can cool the control circuit board and flows within the tubular vibration-proof component.

[0033] According to the above configuration, when the motor vibrates, the tubular vibration-proof component dampens the motor vibration. Furthermore, air that cools the control circuit board flows inside the tubular vibration-proof component. Using the tubular vibration-proof component, the motor vibration can be suppressed and the control circuit board can be cooled with a single component.

[0034] In one or more embodiments, the body housing may include: a first battery receptacle configured to include a first battery configured to power the motor removably attached thereto; and a second battery receptacle configured to include a second battery configured to power the motor removably attached thereto.

[0035] According to the above configuration, the output of the motor unit can be increased or an operation time of the motor unit can be prolonged.

[0036] In one or more embodiments, when the motor unit is viewed along the first direction, the control circuit board may at least partially overlap the motor.

[0037] According to the above configuration, when the motor unit is viewed along the first direction, the motor unit can be suppressed from becoming larger in the direction perpendicular to the first direction compared to a configuration in which the control circuit board does not even at least partially overlap the motor.

[0038] Another motor unit disclosed herein may be configured to be detachably attached to a working unit for driving the working unit. The motor unit may include: a motor having a motor shaft extending in a first direction and configured to drive the working unit; a control circuit board configured to drive the motor; a motor housing supporting the motor; a body housing disposed on an outer side of the control circuit board and the motor housing; a second fixing part configured to be fixed to the working unit; a first vibration-proof member disposed between the body housing and the motor housing; and a second vibration-proof member disposed between the body housing and the motor housing. The motor shaft may be substantially perpendicular to the second fixing part.In a top-bottom direction perpendicular to a placement surface, at least a portion of the first vibration-proof component and at least a portion of the second vibration-proof component may be disposed below an upper end of the motor when the motor unit is placed on the placement surface. When the motor unit is viewed along the first direction, the motor may be disposed between the first vibration-proof component and the second vibration-proof component.

[0039] In one or more embodiments, the motor shaft may extend along the placement surface when the motor unit is placed on the placement surface. The first vibration-proof component and the second vibration-proof component may be arranged below a central axis of the motor shaft when the motor unit is placed on the placement surface.

[0040] Generally, the component(s) of the motor unit are often located in the space above the top of the motor. According to the above configuration, the available space below the center axis of the motor shaft can be utilized.

[0041] In one or more embodiments, the first vibration-proof component may be a first distance from a vertical plane perpendicular to the placement surface and including the first direction. The second vibration-proof component may be the first distance from the vertical plane.

[0042] According to the above configuration, the distance between the first vibration-proof component and the vertical plane is the same as the distance between the second vibration-proof component and the vertical plane. Therefore, the first and second vibration-proof components are arranged symmetrically with respect to the vertical plane. This allows the vibration of the motor to be more dampened.

[0043] In one or more embodiments, the body housing may include: a first battery receptacle configured to include a first battery configured to power the motor, which is removably attached thereto; and a second battery receptacle configured to include a second battery configured to power the motor, which is removably attached thereto.

[0044] According to the above configuration, the output of the motor unit can be increased or the operating time of the motor unit can be prolonged.

[0045] Another motor unit disclosed herein may be configured to be detachably attached to a working unit for driving the working unit. The motor unit may include: a motor having a motor shaft extending in a first direction and configured to drive the working unit; a control circuit board configured to drive the motor; a fan fixed to the motor; a motor housing supporting the motor; a plate housing supporting the control circuit board; a body housing disposed on an outer side of the motor housing and the plate housing; a fixing unit configured to be fixed to the working unit; and a tubular vibration-proof member disposed between the motor housing and the plate housing and having a tubular shape.When the fan rotates, air can cool the control circuit board and can pass inside the tubular vibration-proof component.

[0046] In one or more embodiments, the motor unit may further include: a plate member fixed to the motor housing; a support unit supporting the plate housing; and a vibration-proof member fixed to the plate member and the support unit.

[0047] According to the above configuration, the vibration of the motor is dampened by the tubular vibration-proof component and the vibration-proof component. This suppresses the vibration from being transmitted to the control circuit board.

[0048] In one or more embodiments, when the motor unit is viewed along the first direction, the tubular vibration-proof component may at least partially overlap the motor.

[0049] According to the above configuration, when the motor unit is viewed along the first direction, the motor unit can be suppressed from becoming larger in the direction perpendicular to the first direction compared to a configuration in which the tubular vibration-proof member does not even overlap the motor at least partially.

[0050] In one or more embodiments, the body housing may include: a first battery receptacle configured to include a first battery configured to power the motor, which is removably attached thereto; and a second battery receptacle configured to include a second battery configured to power the motor, which is removably attached thereto.

[0051] According to the above configuration, the output of the motor unit can be increased and / or the operating time of the motor unit can be extended. (First embodiment)

[0052] As in Fig. 1, a system 1 includes a plurality of working units 4 and an engine unit 10. The engine unit 10 is a multi-purpose engine unit. The engine unit 10 can be detachably attached to any of the plurality of working units 4. These working units 4 may also include an internal combustion engine unit detachably attached instead of the engine unit 10. The internal combustion engine unit is a versatile internal combustion engine unit, for example, the GX120 internal combustion engine unit sold by Honda R&D Co. Ltd. That is, the working unit 4 is applicable to (compatible with) both the engine unit 10 and the internal combustion engine unit.The various types of working units 4 include, for example, a rammer 4a, a vibrating plate 4b, a slope mower (lawn mower) 4c, a trowel / screed 4d, a concrete saw / floor cutter 4e, a reel mower 4f, an edger 4g, a stripper / rotary tiller 4h, a stump grinder 4i, a compressor 4j, a pressure washer 4k, a paint / varnish sprayer 4l, a dirty water pump 4m, and a chemical sprayer 4n. The working unit 4 is not limited to the above working unit 4, but may be any working unit 4 other than the above. For example, as shown in FIG. Fig. 2, the motor unit 10 is detachably attached to the rammer 4a. As shown in Fig. As shown in Figure 3, the motor unit 10 is detachably attached to the vibrating plate 4b. Hereinafter, the configuration in which the motor unit 10 is attached to the working unit 4 is sometimes referred to as a working machine 2. A user works using the working machine 2.

[0053] As in Fig. 4, the motor unit 10 is driven by power from several (in this example, two) battery packs BP. Hereinafter, one battery pack BP is referred to as a first battery pack BP1, and the other battery pack BP is referred to as a second battery pack BP2. A direction in which a motor shaft 140 of a motor 86 (see Fig. 16) described below may be referred to as a front-to-back direction, a direction perpendicular to the front-to-back direction may be referred to as a left-to-right direction, and a direction perpendicular to the front-to-back and left-to-right directions may be referred to as an up-down direction. The above front-to-back, left-to-right, and up-down directions are defined to describe the detailed configuration of the engine unit 10. In a work machine 2 in which the engine unit 10 and the work unit 4 are combined, the front-to-back, left-to-right, and up-down directions of the work machine 2 may be different from the front-to-back, left-to-right, and up-down directions of the engine unit 10.

[0054] As in Fig. As shown in Figure 5, for the motor unit 10 having the plurality of battery packs BP, the weight of the motor unit 10 is equal to or more than 11.7 kg and equal to or less than 19 kg. The length of the motor unit 10 in the front-to-back direction is equal to or more than 230 mm and equal to or less than 235 mm. The length in the front-to-back direction does not include the length of the motor shaft 140 exposed outside the motor unit 10. The length of the motor unit 10 in the left-to-right direction is equal to or more than 170 mm and equal to or less than 230 mm. The length of the motor unit 10 in the up-to-down direction is equal to or more than 280 mm and equal to or less than 350 mm. The volume of the motor unit 10 is equal to or more than 9500 cm3. 3 and equal to or less than 13,000 cm 3 .

[0055] For the motor unit 10 that does not have the plurality of battery packs BP, the weight of the motor unit 10 is equal to or more than 10.5 kg and equal to or less than 15 kg. The length of the motor unit 10 in the front-to-back direction is equal to or more than 230 mm and equal to or less than 235 mm. The length in the front-to-back direction does not include the length of the motor shaft 140 exposed outside the motor unit 10. The length of the motor unit 10 in the left-to-right direction is equal to or more than 170 mm and equal to or less than 230 mm. The length of the motor unit 10 in the up-to-down direction is equal to or more than 240 mm and equal to or less than 260 mm. The volume of the motor unit 10 is equal to or more than 8500 cm 3 and equal to or less than 10,000 cm 3 .

[0056] As in Fig. 4 and Fig. 6, the motor unit 10 has a body casing 12. The body casing 12 is formed, for example, from a resin material. As shown in Fig. 5, the weight of the body casing 12 is equal to or more than 0.9 kg and equal to or less than 1.2 kg. The length of the body casing 12 in the front-back direction is equal to or more than 220 mm and equal to or less than 225 mm. The length of the body casing 12 in the left-right direction is equal to or more than 170 mm and equal to or less than 230 mm. The length of the body casing 12 in the up-down direction is equal to or more than 220 mm and equal to or less than 240 mm. The volume of the body casing 12 is equal to or more than 8,000 cm 3 and equal to or less than 9,500 cm 3 .

[0057] As in Fig. 4 and Fig. 6, the body housing 12 comprises a right body housing 14 and a left body housing 16. The right body housing 14 defines an outer shape of a right half of the body housing 12. The left body housing 16 defines an outer shape of a left half of the body housing 12. The right body housing 14 and the left body housing 16 are connected by screws 17 (see Fig. 12). Each of the right body housing 14 and the left body housing 16 has a shape that bisects the body housing 12 in a plane along the front-back and top-bottom directions. A boundary between the right body housing 14 and the left body housing 16 is arranged in the center of the body housing 12 in the left-right direction. A receiving space 18 (see Fig. 13) is defined between the right body housing 14 and the left body housing 16.

[0058] The body housing 12 has a receiving part 20, a first battery receptacle 22 and a second battery receptacle 24. The receiving part 20 has the inner receiving space 18 (see Fig. 13). The receiving part 20 has a first opening 26 and a second opening 28. The first opening 26 is defined in a front wall 20a of the receiving part 20. The first opening 26 has a substantially circular cross-sectional shape. The first opening 26 connects the receiving space 18 to an outside of the body housing 12. As shown in Fig. As shown in Figure 6, the second opening 28 is defined in a bottom wall 20b of the receiving part 20. The second opening 28 has a substantially rectangular cross-sectional shape. The second opening 28 connects the receiving space 18 to the outside of the body housing 12.

[0059] As in Fig. As shown in Fig. 7, an upper wall 20c of the receiving part 20 includes a base 32, a first pyramidal base 34, and a second pyramidal base 36. The first pyramidal base 34 protrudes upward from the base 32. The first pyramidal base 34 has a quadrangular pyramid shape. An upper surface 34a of the first pyramidal base 34 is positioned above an upper surface 32a of the base 32. Each of the upper surfaces 32a and 34a is perpendicular to the up-down direction.

[0060] The second pyramidal base 36 projects upward from the base 32. The second pyramidal base 36 is connected to a rear end of the first pyramidal base 34.

[0061] The first battery receptacle 22 and the second battery receptacle 24 are arranged on the upper surface 34a of the first pyramid-shaped base 34. The first battery receptacle 22 and the second battery receptacle 24 are arranged side by side in the left-right direction. When the motor unit 10 is viewed along the up-down direction, the first battery receptacle 22 does not overlap the second battery receptacle 24.

[0062] The first battery receptacle 22 includes a first right rail portion 40, a first left rail portion 42, and a first connecting portion 44. The first right rail portion 40 and the first left rail portion 42 extend in a front-to-back direction. The first right rail portion 40 extends upward from the upper surface 34a of the first pyramid-shaped base 34 and then bends to extend to the left. The first left rail portion 42 extends upward from the upper surface 34a of the first pyramid-shaped base 34 and then bends to extend to the right. The first left rail portion 42 opposes the first right rail portion 40 in the left-to-right direction. The first connecting portion 44 connects a front end of the first right rail portion 40 to a front end of the first left rail portion 42.

[0063] The second battery holder 24 includes a second right rail portion 48, a second left rail portion 50, and a second connecting portion 52. The second right rail portion 48 and the second left rail portion 50 extend in the front-to-back direction. The second right rail portion 48 extends upward from the upper surface 34a of the first pyramid-shaped base 34 and then bends to extend to the left. The first left rail portion 42 is integrated with the second right rail portion 48. The second left rail portion 50 extends upward from the upper surface 34a of the first pyramid-shaped base 34 and then bends to extend to the right. The second left rail portion 50 is opposite the second right rail portion 48 in the left-to-right direction.The second connecting portion 52 connects a front end of the second right rail portion 48 to a front end of the second left rail portion 50.

[0064] As in Fig. As shown in Figure 8, the first battery pack BP1 is mounted on the first battery receptacle 22. The second battery pack BP2 is mounted on the second battery receptacle 24. In the present embodiment, the configuration of the first battery pack BP1 is identical to that of the second battery pack BP2. For this reason, the first battery pack BP1 is exemplified below.

[0065] The first battery pack, BP1, features a rechargeable battery that can be charged and discharged, such as a lithium-ion battery. As described in Fig. As shown in Figure 5, the weight of the first battery pack BP1 is equal to or more than 0.6 kg and equal to or less than 2 kg. The length of the first battery pack BP1 in the front-to-back direction is equal to or more than 115 mm and equal to or less than 155 mm. The length of the first battery pack BP1 in the left-to-right direction is equal to or more than 75 mm and equal to or less than 85 mm. The length of the first battery pack BP1 in the up-and-down direction is equal to or more than 65 mm and equal to or less than 115 mm. The volume of the first battery pack BP1 is equal to or more than 500 cm 3 and equal to or less than 1,500 cm 3 . As in Fig. 9, a maximum voltage value of the first battery pack BP1 is equal to or more than 40 V and equal to or less than 80 V. A rated capacity of the first battery pack BP1 is equal to or more than 4 Ah and equal to or less than 40 Ah. In a variant, the configuration of the first battery pack BP1 (ie, dimensions, maximum voltage value, and rated capacity) may be different from the configuration of the second battery pack BP2 (ie, dimensions, maximum voltage value, and rated capacity).

[0066] As in Fig. As shown in Figure 10, the first battery pack BP1 includes a battery case 56, a hook 58, a right battery rail 60, and a left battery rail 62. The battery case 56 accommodates rechargeable secondary battery cells, e.g., lithium-ion battery cells, therein.

[0067] The hook 58 is movably mounted on a lower surface 56a of the battery housing 56. The hook 58 has an engagement portion 64 and an actuating portion 66. The engagement portion 64 is, for example, an engagement claw. The engagement portion 64 typically protrudes outside the battery housing 56. When the actuating portion 66 is pressed into the battery housing 56, the entire engagement portion 64 moves into the interior of the battery housing 56.

[0068] The right battery rail 60 and the left battery rail 62 protrude from the bottom surface 56a of the battery case 56. The right battery rail 60 and the left battery rail 62 extend in the front-to-back direction. The right battery rail 60 is arranged side by side with the left battery rail 62 in the left-right direction. With respect to the left-right direction, the engaging portion 64 is positioned between the right battery rail 60 and the left battery rail 62. The right battery rail 60 extends downward from the bottom surface 56a of the battery case 56 and then bends to extend to the right. The left battery rail 62 extends downward from the bottom surface 56a of the battery case 56 and then bends to extend to the left.

[0069] As in Fig. 11, when the first battery pack BP1 is slid in an attachment direction D1, the first battery pack BP1 is guided by the first right rail section 40 (see Fig. 7) and the first left rail section 42 (see Fig. 7) and slides on the upper surface 34a of the first pyramid-shaped base 34. The mounting direction D1 is directed forward. As a result, the right battery rail 60 (see Fig. 10) is slidably engaged with the first right rail section 40, and the left battery rail 62 (see Fig. 10) is slidably engaged with the first left rail portion 42. When the first battery pack BP1 slides on the upper surface 34a and the engaging portion 64 contacts the upper surface 34a, the engaging portion 64 is pressed into the battery case 56 by the upper surface 34a. The upper surface 34a has a recessed groove 34b recessed from the upper surface 34a. When the engaging portion 64 reaches the recessed groove 34b, it exits the interior of the battery case 56 and engages the upper surface 34a in the recessed groove 34b. Due to this, the first battery pack BP1 is attached to the first battery receptacle 22. When the operating portion 66 is pushed in, the engaging portion 64 slides out of the recessed groove 34b, so that the first battery pack BP1 can be removed from the first battery receptacle 22 by sliding the first battery pack BP1 in a removal direction D2.The removal direction D2 is opposite to the attachment direction D1 and is directed rearward. Although omitted from the drawings, an attachment direction for attaching the second battery pack BP2 to the second battery receptacle 24 is the same as the attachment direction D1. A removal direction for removing the second battery pack BP2 from the second battery receptacle 24 is the same as the removal direction D2.

[0070] As in Fig. As shown in Fig. 8, when the first battery pack BP1 is attached to the first battery receptacle 22 and the second battery pack BP2 is attached to the second battery receptacle 24, the lower surface 56a of the battery case 56 of the first battery pack BP1 is in contact with the first battery receptacle 22 from above, and the lower surface 56a of the battery case 56 of the second battery pack BP2 is in contact with the second battery receptacle 24 from above. A left side surface 56b of the battery case 56 of the first battery pack BP1 is opposite in the left-right direction to a right side surface 56c of the battery case 56 of the second battery pack BP2. The left side surface 56b of the battery case 56 of the first battery pack BP1 is substantially parallel to the right side surface 56c of the battery case 56 of the second battery pack BP2.There is no wall containing the receiving portion 20 between the left lateral surface 56b of the battery housing 56 of the first battery pack BP1 and the right lateral surface 56c of the battery housing 56 of the second battery pack BP2. A distance between the left lateral surface 56b of the battery housing 56 of the second battery pack BP2 and the right lateral surface 56c of the battery housing 56 of the first battery pack BP1 is equal to or less than 175 mm. In a variant, the distance between the left lateral surface 56b of the battery housing 56 of the second battery pack BP2 and the right lateral surface 56c of the battery housing 56 of the first battery pack BP1 may be equal to or less than 350 mm.

[0071] As in Fig. As shown in Fig. 7, the motor unit 10 includes a first battery terminal 70, a second battery terminal 72, a main power switch (main switch) 74, a display panel 76, an operation switch (operation switch) 78a, and a speed change switch (speed change switch) 78b. The first battery terminal 70 and the second battery terminal 72 are arranged on the upper surface 34a of the first pyramid-shaped base 34. The first battery terminal 70 is surrounded by the first battery receptacle 22. The first battery terminal 70 includes a plurality of first terminal members 79. The first terminal members 79 are electrically connected to terminal members (not shown) of the first battery pack BP1 when the first battery pack BP1 is attached to the first battery receptacle 22.

[0072] The second battery terminal 72 is surrounded by the second battery receptacle 24. The second battery terminal 72 has a plurality of second terminal components 80. The second terminal components 80 are electrically connected to the terminal components (not shown) of the second battery pack BP2 when the second battery pack BP2 is attached to the second battery receptacle 24. In the present embodiment, when the first battery pack BP1 is attached to the first battery receptacle 22 and the second battery pack BP2 is attached to the second battery receptacle 24, the first battery pack BP1 and the second battery pack BP2 are electrically connected in series. In a variation, the second terminal components 80 may be electrically connected in parallel with the first terminal components 79.

[0073] The main power switch 74 and the indicator panel 76 are arranged on the second pyramid-shaped base 36. The main power switch 74 is configured to switch the motor unit 10 between on and off states. The indicator panel 76 illuminates when the motor unit 10 is in an on state.

[0074] The operating switch 78a is arranged behind the main power switch 74 and the display panel 76. The operating switch 78a is a rocker switch. When a right portion of the operating switch 78a is pushed into the body casing 12, a left portion of the operating switch 78a exits the interior of the body casing 12, and when the left portion of the operating switch 78a is pushed into the body casing 12, the right portion of the operating switch 78a exits the interior of the body casing 12. When the left portion of the operating switch 78a is pushed into the body casing 12 when the motor unit 12 is turned on, the motor unit 10 operates. While the motor unit 10 is operating, when the right portion of the operating switch 78a is pushed into the body casing 12, the motor unit 10 stops.

[0075] The speed change switch 78b is arranged on the second pyramid-shaped base 36. The speed change switch 78b is arranged on a left side of the display panel 76. The speed change switch 78b changes the speed of the motor 86, which will be described later.

[0076] As in Fig. 12, the motor unit 10 comprises the motor housing 84, the motor 86 (see Fig. 16), the blower 88 (see Fig. 16), a fixing unit 90, a plate component 92, a vibration-proof part 94 (see Fig. 18 and Fig. 19), a right cover component 96, a left cover component 98, a support unit 100, a control unit 102 (see Fig. 25) and a tubular vibration-proof component 104 (see Fig. 25).

[0077] As in Fig. As shown in Figure 13, the motor housing 84 is surrounded by the receiving portion 20. The receiving portion 20 is disposed outside the motor housing 84. The motor housing 84 accommodates the motor 86 and the fan 88 therein. The motor housing 84 includes a motor housing body 108, a front bracket 110, and a rear bracket 112.

[0078] The motor housing body 108 has a tube section 114, a partition wall section 116, a screw dome section 118 (see Fig. 14) and a leg portion (foot portion) 120. The tube portion 114 has a cylindrical shape. The partition wall portion 116 extends radially inward from an inner surface of the tube portion 114 toward a center of the tube portion 114. As shown in Fig. 14, the screw dome portion 118 projects upwardly from a top surface of the tube portion 114. The leg portion 120 projects downwardly from a bottom surface of the tube portion 114. As shown in Fig. 13, the leg portion 120 penetrates the second opening 28.

[0079] The front bracket 110 is fixed to a front end of the motor housing body 108 by screws 121 (see Fig. 14). A motor accommodation space 122 is defined by the front bracket 110, the pipe section 114, and a front surface of the partition wall section 116. The front bracket 110 penetrates the first opening 26 of the body casing 12. The front bracket 110 is separated from an outer edge of the first opening 26. The front bracket 110 and the outer edge of the first opening 26 define an air inlet opening 26a. The air inlet opening 26a is a portion of the first opening 26. The air inlet opening 26a connects the accommodation space 18 of the body casing 12 to the outside of the body casing 12. As shown in Fig. As shown in Figure 15, the front bracket 110 has an exhaust port 124. The exhaust port 124 penetrates the front bracket 110 in the front-to-rear direction. The exhaust port 124 connects the motor housing 122 to the outside of the motor housing 84.

[0080] As in Fig. 16, the rear bracket 112 is secured to a rear end of the motor housing body 108 by screws 125 (see Fig. 14). A fan receiving space 126 is defined by the rear bracket 112, the pipe section 114, and a rear surface of the partition wall section 116. The rear bracket 112 has a motor inlet opening 128. The motor inlet opening 128 extends through the rear bracket 112 in the front-to-rear direction. The motor inlet opening 128 connects the fan receiving space 126 to the outside of the motor housing 84.

[0081] The motor 86 is arranged in the motor receiving space 122. The motor 86 is, for example, a DC motor. In one variant, the motor 86 can be an AC motor. The motor 86 is a brushless outer rotor motor. In one variant, the motor 86 can be a brushless inner rotor motor or a brush motor. The motor 86 operates when the left section of the actuating switch 78a (see Fig. 7) is pressed into the body casing 12 when the motor unit 10 is in the power-on state. The motor 86 is driven by electrical power supplied from the battery packs BP.

[0082] As in Fig. 5, a weight of the motor 86 is equal to or more than 2 kg and equal to or less than 3 kg. A length of the motor 86 in the front-rear direction is equal to or more than 140 mm and equal to or less than 145 mm. A volume of the motor 86 is equal to or more than 650 cm 3 and equal to or less than 750 cm3 . A diameter of the engine 86 is equal to or more than 80 mm and equal to or less than 145 mm. As in Fig. 9, a maximum output value of the motor 86 is equal to or more than 1.5 kW and equal to or less than 4 kW. In a variation, the maximum output value of the motor 86 may be equal to or more than 1.5 kW and equal to or less than 3 kW, or equal to or more than 1.5 kW and equal to or less than 2.35 kW. A maximum current value of the motor 86 is equal to or more than 15 A and equal to or less than 70 A. A torque of the motor 86 is equal to or more than 2 Nm and equal to or less than 11 Nm. In a variation, the torque of the motor 86 may be equal to or more than 3 Nm and equal to or less than 8 Nm. A speed of the motor 86 is equal to or more than 3,000 rpm and equal to or less than 4,300 rpm.

[0083] As in Fig. As shown in Figure 16, the motor 86 includes a stator body 132, a coil (winding) 134, an outer rotor body 136, a plurality of permanent magnets 138, and a motor shaft 140. The coil 134 is wound around the stator body 132. The outer rotor body 136 is arranged to surround an outer periphery of the stator body 132. A diameter of the outer rotor body 136 is approximately the same as the diameter of the motor 86. Each permanent magnet 138 is fixed to the outer rotor body 136.

[0084] The motor shaft 140 is fixed to the outer rotor body 136. The motor shaft 140 extends along the placement surface P1 when the motor unit 10 is placed on the placement surface P1. The motor shaft 140 penetrates the stator body 132. The motor shaft 140 penetrates the partition wall portion 116. The motor shaft 140 is rotatably supported by the partition wall portion 116 via a bearing 142. The motor shaft 140 penetrates the front bracket 110. The motor shaft 140 is rotatably supported on the front bracket 110 via a bearing 144. The motor shaft 140 rotates about a central axis 140a.

[0085] The fan 88 is fixed to a rear end of the motor shaft 140. The fan 88 is arranged in the fan receiving space 126. In the present embodiment, the fan 88 is a centrifugal fan. In a variant, the fan 88 can be an axial fan. The fan 88 rotates together with the motor shaft 140.

[0086] The fixing unit 90 has a first fixing part 148 and a second fixing part 150. The first fixing part 148 is fixed to a lower end of the leg portion 120 by screws 152. The first fixing part 148 has a first fixing surface 148a. The first fixing surface 148a corresponds to a lower surface of the first fixing part 148. The first fixing surface 148a is substantially parallel to the motor shaft 140. When the motor unit 10 is placed on the placement surface P1, the first fixing surface 148a contacts the placement surface P1. The first fixing surface 148a is fixed to the working unit 4 (see Fig. 3) fixed.

[0087] As in Fig. 13, the first fixing part 148 is arranged below the motor 86. The motor 86 is positioned between the first fixing part 148 and the first battery receptacle 22. Furthermore, the motor 86 is positioned between the first fixing part 148 and the second battery receptacle 24 (see Fig. 12).

[0088] As in Fig. 16, the second fixing part 150 is formed on the front bracket 110. The second fixing part 150 has a second fixing surface 150a. The second fixing surface 150a corresponds to a front surface of the second fixing part 150. When the motor unit 10 is placed on the placement surface P1, the second fixing surface 150a is perpendicular to the placement surface P1. The second fixing surface 150a is substantially perpendicular to the first fixing surface 148a. The second fixing surface 150a is substantially perpendicular to the motor shaft 140. The second fixing surface 150a is formed on the working unit 4 (see Fig. 2). The type of working unit 4 configured to be fixed to the second fixing surface 150 is different from the type of working unit 4 configured to be fixed to the first fixing surface 148a.

[0089] As in Fig. As shown in Figure 17, the plate component 92 includes a plate body 154. The plate body 154 is formed by bending a single plate. The plate body 154 has a substantially U-shape. The plate body 154 is fixed to the screw boss portion 118 by screws 155. The plate body 154 faces the top, a right portion, and a left portion of the tube portion 114.

[0090] As in Fig. 18 and Fig. As shown in Figure 19, the plate member 92 includes a first right sleeve 156, a second right sleeve 158, a third right sleeve 160, a first left sleeve 162, a second left sleeve 164, and a third left sleeve 166. The first right sleeve 156 has a cylindrical shape. A shape of the second right sleeve 158, a shape of the third right sleeve 160, a shape of the first left sleeve 162, a shape of the second left sleeve 164, and a shape of the third left sleeve 166 are identical to the shape of the first right sleeve 156.

[0091] As in Fig. As shown in Fig. 18, the first right sleeve 156, the second right sleeve 158, and the third right sleeve 160 protrude rightward from a right wall 154a of the plate body 154. The first right sleeve 156 is disposed at a lower side of the right wall 154a. The second right sleeve 158 is disposed at a front upper portion of the right wall 154a. The third right sleeve 160 is disposed at a rear upper portion of the right wall 154a.

[0092] As in Fig. As shown in Fig. 20, the first right sleeve 156 is arranged below the central axis 140a of the motor shaft 140. The second right sleeve 158 and the third right sleeve 160 are positioned above the central axis 140a of the motor shaft 140. A position of the second right sleeve 158 in the up-down direction is identical to a position of the third right sleeve 160 in the up-down direction. With respect to the front-back direction, the first right sleeve 156 is positioned midway between the second right sleeve 158 and the third right sleeve 160. A distance between the first right sleeve 156 and the second right sleeve 158 is identical to a distance between the second right sleeve 158 and the third right sleeve 160 and a distance between the third right sleeve 160 and the first right sleeve 156, respectively.

[0093] As in Fig. As shown in Fig. 19, the first left sleeve 162, the second left sleeve 164, and the third left sleeve 166 protrude to the left from a left wall 154b of the plate body 154. A position of the first left sleeve 162 in the up-down and front-back directions is identical to a position of the first right sleeve 156 in the up-down and front-back directions. A position of the second left sleeve 164 in the up-down and front-back directions is identical to a position of the second right sleeve 158 in the up-down and front-back directions. A position of the third left sleeve 166 in the up-down and front-back directions is identical to a position of the third right sleeve 160 in the up-down and front-back directions. As shown in Fig. 21, a distance between the first left sleeve 162 and the second left sleeve 164 is substantially identical to a distance between the second left sleeve 164 and the third left sleeve 166, or to a distance between the third left sleeve 166 and the first left sleeve 162. Furthermore, the distance between the first left sleeve 162 and the second left sleeve 164 is substantially identical to a distance between the first right sleeve 156 (see Fig. 20) and the second right sleeve 158 (see Fig. 20).

[0094] As in Fig. 18 and Fig. As shown in FIG. 19, the vibration-proof part 94 includes a first right vibration-proof component 170, a second right vibration-proof component 172, a third right vibration-proof component 174, a first left vibration-proof component 176, a second left vibration-proof component 178, and a third left vibration-proof component 180. The first right vibration-proof component 170 has a cylindrical shape. The first right vibration-proof component 170 is made of an elastic material. The first right vibration-proof component 170 is made of, for example, a foam material, a rubber material, a thermoplastic elastomer material, or a thermosetting elastomer material.Shapes of the second right vibration-proof component 172, the third right vibration-proof component 174, the first left vibration-proof component 176, the second left vibration-proof component 178, and the third left vibration-proof component 180 are the same as those of the first right vibration-proof component 170. Materials of the second right vibration-proof component 172, the third right vibration-proof component 174, the first left vibration-proof component 176, the second left vibration-proof component 178, and the third left vibration-proof component 180 are the same as the material of the first right vibration-proof component 170.

[0095] As in Fig. As shown in Fig. 18, the first right sleeve 156 is inserted into an opening 170a of the first vibration-proof member 170. The second right sleeve 158 is inserted into an opening 172a of the second right vibration-proof member 172. The third right sleeve 160 is inserted into an opening 174a of the third right vibration-proof member 174. The first right vibration-proof member 170 protrudes to the right side of the first right sleeve 156 when it is in contact with the right wall 154a of the plate body 154. The second right vibration-proof member 172 protrudes to the right side of the second right sleeve 158 when it is in contact with the right wall 154a of the plate body 154. The third right vibration-proof member 174 protrudes to the right side of the third right sleeve 160 when it is in contact with the right wall 154a of the plate body 154. As shown in Fig. As shown in Figure 20, the first right vibration-proof component 170 is positioned below a center of gravity G1 of the motor unit 10. The center of gravity G1 of the motor unit 10 is the center of gravity when the battery packs BP are not mounted. The second right vibration-proof component 172 and the third right vibration-proof component 174 are arranged above the center of gravity G1 of the motor unit 10. A distance between the first right vibration-proof component 170 and the second right vibration-proof component 172 is substantially identical to a distance between the second right vibration-proof component 172 and the third right vibration-proof component 174, and a distance between the third right vibration-proof component 174 and the first right vibration-proof component 170, respectively.With respect to the front-rear direction, a center position of the first right vibration-proof member 170 is substantially identical to the position of the center of gravity G1 of the motor unit 10.

[0096] As in Fig. As shown in Fig. 19, the first left sleeve 162 is inserted into an opening 176a of the first left vibration-proof member 176. The first left vibration-proof member 176 is positioned below the center of gravity G1 of the motor unit 10. The second left sleeve 164 is inserted into an opening 178a of the second left vibration-proof member 178. The third left sleeve 166 is inserted into an opening 180a of the third left vibration-proof member 180. The second left vibration-proof member 178 and the third left vibration-proof member 180 are positioned above the center of gravity G1 of the motor unit 10. The first left vibration-proof member 176 protrudes to the left side of the first left sleeve 162 when in contact with the left wall 154b of the plate body 154. The second left vibration-proof member 178 projects to the left side of the second left sleeve 164 when in contact with the left wall 154b of the plate body 154.The third left vibration-proof member 180 protrudes to the left side of the third left sleeve 166 when in contact with the left wall 154b of the plate body 154. As shown in FIG. Fig. 21, a distance between the first left vibration-proof component 176 and the second left vibration-proof component 178 is substantially identical to a distance between the second left vibration-proof component 178 and the third left vibration-proof component 180, or a distance between the third left vibration-proof component 180 and the first left vibration-proof component 176. Furthermore, the distance between the first left vibration-proof component 176 and the second left vibration-proof component 178 is substantially identical to a distance between the first right vibration-proof component 170 (see Fig. 20) and the second right vibration-proof component 172 (see Fig. 20). With respect to the front-to-rear direction, a center position of the first left vibration-proof member 176 is substantially identical to the position of the center of gravity G1 of the motor unit 10.

[0097] As in Fig. As shown in Fig. 22, when the motor unit 10 is placed on the placement surface P1, the first right vibration-proof component 170 and the first left vibration-proof component 176 are positioned below an upper end 86a of the motor 86. The upper end 86a of the motor 86 is substantially the same as an upper end of the outer rotor body 136. In Fig. In FIGS. 20 to 23, a position of the upper end 86a of the motor 86 in the up-down direction is shown by a single-dotted line. The first right vibration-proof component 170 and the first left vibration-proof component 176 are positioned below the center axis 140a of the motor shaft 140. The first right vibration-proof component 170 and the first left vibration-proof component 176 are arranged above a lower end 86b of the motor 86. The lower end 86b of the motor 86 is substantially the same as a lower end of the outer rotor body 136. Fig. 20 to 23, a position of the lower end 86b of the motor 86 in the up-down direction is shown by a single-dotted line. The first right vibration-proof member 170 is arranged mirror-symmetrically to the first left vibration-proof member 176 with respect to a vertical plane P2 perpendicular to the placement surface P1 and including the center axis 140a of the motor shaft 140 (i.e., front-back direction). A distance between the first right vibration-proof member 170 and the vertical plane P2 is substantially identical to a distance between the first left vibration-proof member 176 and the vertical plane P2. When the motor unit 10 is viewed along the front-back direction, the motor 86 and the fan 88 are positioned between the first right vibration-proof member 170 and the first left vibration-proof member 176.When the motor unit 10 is viewed along the left-right direction, each of the motor 86 and the fan 88 at least partially overlaps the first right vibration-proof member 170 and the first left vibration-proof member 176 (see . Fig. 21).

[0098] As in Fig. 23, when the motor unit 10 is placed on the placement surface P1, the second right vibration-proof member 172 and the second left vibration-proof member 178 are arranged above the lower end 86b of the motor 86. The second right vibration-proof member 172 and the second left vibration-proof member 178 are positioned above the lower end 86b of the motor 86. The second right vibration-proof member 172 and the second left vibration-proof member 178 are positioned above the central axis 140a of the motor shaft 140. A center of the second right vibration-proof member 172 in the up-down direction and a center of the second left vibration-proof member 178 in the up-down direction are arranged below the upper end 86a of the motor 86. An upper end of the second right vibration-proof member 172 and an upper end of the second left vibration-proof member 178 are disposed above the upper end 86a of the motor 86.The second right vibration-proof component 172 is positioned mirror-symmetrically to the second left vibration-proof component 178 with respect to the vertical plane P2. A distance between the second right vibration-proof component 172 and the vertical plane P2 is substantially the same as a distance between the second left vibration-proof component 178 and the vertical plane P2. When the motor unit 10 is viewed along the front-rear direction, the motor 86 and the fan 88 (see .) Fig. 22) is arranged between the second right vibration-proof member 172 and the second left vibration-proof member 178. When the engine unit 10 is viewed along the front-rear direction, an entirety of the second right vibration-proof member 172 overlaps an entirety of the third right vibration-proof member 174 (see Fig. 20), and an entirety of the second left vibration-proof component 178 overlaps an entirety of the third left vibration-proof component 180 (see Fig. 21). With respect to the vertical plane P2, the third right vibration-proof component 174 is arranged in mirror symmetry with the third left vibration-proof component 180. Furthermore, when the motor unit 10 is viewed along the front-rear direction, the motor 86 and the fan 88 are positioned between the third right vibration-proof component 174 and the third left vibration-proof component 180.

[0099] When the motor unit 10 is viewed along the left-right direction, the motor 86 is located between the second right vibration-proof member 172 and the second left vibration-proof member 178 (see Fig. 21). Furthermore, as in Fig. 20, the second right vibration-proof component 172 and the second left vibration-proof component 178 are also arranged in front of the fan 88. In addition, the third right vibration-proof component 174 and the third left vibration-proof component 180 (see Fig. 21) positioned behind the fan 88.

[0100] As in Fig. As shown in Fig. 18, the right cover member 96 is arranged on a right side of the right wall 154a of the plate body 154. The first right vibration-proof member 170, the second right vibration-proof member 172, and the third right vibration-proof member 174 are interposed between the right cover member 96 and the right wall 154a of the plate body 154. The right cover member 96 is attached to the plate body 154 via the first right vibration-proof member 170, the second right vibration-proof member 172, and the third right vibration-proof member 174. The right cover member 96 is not in contact with the plate member 92. As shown in Fig. 12, the right cover member 96 is positioned between the right body casing 14 and the right wall 154a of the plate body 154. The right cover member 96 is fixed to the right body casing 14. This suppresses the first right vibration-proof member 170 (see Fig. 18), the second right vibration-proof component 172 (see Fig. 18) and the third right vibration-proof component 174 (see Fig. 18) from the plate component 92.

[0101] As in Fig. As shown in Figure 19, the left cover member 98 is arranged on the left side of the left wall 154b of the plate body 154. The first left vibration-proof member 176, the second left vibration-proof member 178, and the third left vibration-proof member 180 are interposed between the left cover member 98 and the left wall 154b of the plate body 154. The left cover member 98 is attached to the plate body 154 via the first left vibration-proof member 176, the second left vibration-proof member 178, and the third left vibration-proof member 180. The left cover member 98 is not in contact with the plate member 92. As shown in Fig. 12, the left cover member 98 is positioned between the left body casing 16 and the left wall 154b of the plate body 154. The left cover member 98 is fixed to the left body casing 16. This suppresses the first left vibration-proof member 176 (see Fig. 19), the second left vibration-proof component 178 (see Fig. 19) and the third left vibration-proof component 180 (see Fig. 19) from the plate component 92.

[0102] As in Fig. As shown in Fig. 24, the support unit 100 includes a support plate 184. The support plate 184 is formed by bending a single plate. The support plate 184 has a substantially U-shape. The support plate 184 includes an upper wall 184a opposite to an upper surface of the plate body 154 of the plate member 92, a right wall 184b opposite to a right surface of the right cover member 96, and a left wall 184c opposite to a left surface of the left cover member 98. The plate member 92, the right cover member 96, and the left cover member 98 are interposed between the right wall 184b and the left wall 184c.

[0103] The upper wall 184a has two right positioning holes 185a and two left positioning holes 185b. The right positioning holes 185a penetrate the upper wall 184a in the up-down direction. The right positioning holes 185a are located at a right end of the upper wall 184a. The two right positioning holes 185a are aligned in the front-back direction. The left positioning holes 185b penetrate the upper wall 184a in the up-down direction. The left positioning holes 185b are located at a left end of the upper wall 184a. The two left positioning holes 185b are aligned in the front-back direction.

[0104] The right cover member 96 has two right positioning protrusions 96a projecting upward, and the right positioning holes 185a receive these right positioning protrusions 96a. The left cover member 98 has two left positioning protrusions 98a projecting upward, and the left positioning holes 185b receive these left positioning protrusions 98a. Due to this, the support plate 184 is positioned relative to the right cover member 96 and the left cover member 98. The support plate 184 is fixed to the right cover member 96 by screws 185c. The support plate 184 is fixed to the left cover member 98 by screws 185d.

[0105] As in Fig. As shown in Fig. 22, the right wall 184b is interposed between the right surface of the right cover member 96 and the right body case 14. The right wall 184b, the right cover member 96, and the right body case 14 are fixed together with screws 186. The left wall 184c is interposed between the left surface of the left cover member 98 and the left body case 16. The left wall 184c, the left cover member 98, and the left body case 16 are fixed together with screws 188.

[0106] As in Fig. 25, the control unit 102 is arranged behind the motor housing 84. The control unit 102 is inside the body housing 12 (see Fig. 4). The control unit 102 comprises a plate housing 192, a filter component 194 (see Fig. 26), a control circuit board 196 (see Fig. 26) and a record sleeve (record bowl) 197 (see Fig. 26). The plate housing 192 has an outer housing part 198 and an inner housing part 199 (see Fig. 26). The outer housing part 198 defines an outer shape of the control unit 102. The outer housing part 198 is fixed to a rear end of the support plate 184 by screws 190. As shown in Fig. As shown in Figure 26, the outer housing part 198 has an interior space 200. Furthermore, the outer housing part 198 has an inlet opening 202. The inlet opening 202 is located at a rear portion of the outer housing part 198. The inlet opening 202 connects the interior space 200 to the outside of the plate housing 192.

[0107] The inner housing part 199 is arranged in the interior space 200. The inner housing part 199 is arranged in front of the inlet opening 202. The inner housing part 199 is fixed to the outer housing part 198. The inner housing part 199 has a plate receiving space 203 therein.

[0108] The filter component 194 is arranged in the interior space 200. The filter component 194 is arranged in front of the inlet opening 202. The filter component 194 blocks the inlet opening 202. The filter component 194 has fine ventilation holes (not shown) therein. The filter component 194 is made of, for example, filter material or foam material. Air flows through the filter component 194 through the ventilation holes. As the air flows through the ventilation holes, the filter component 194 removes dust and other foreign particles contained in the flowing air.

[0109] The control circuit board 196 is arranged in the board receiving space 203. The control circuit board 196 includes a microcontroller and a plurality of switching elements. The switching elements are, for example, IGBTs or MOSFETs. The switching elements are switched between an on-state and an off-state by being controlled by the microcontroller. The control circuit board 196 is arranged along a plane extending along the up-down and left-right directions. The control circuit board 196 is arranged in front of the inlet opening 202. The control circuit board 196 is arranged behind the motor inlet opening 128 on the rear bracket 112. The control circuit board 196 controls the motor 86 (see Fig. 13). As in Fig. As shown in Figure 13, the control circuit board 196 is arranged on the central axis 140a of the motor shaft 140. The control circuit board 196 is arranged behind the fan 88. When the motor unit 10 is viewed along the front-to-rear direction, the control circuit board 196 at least partially overlaps each of the motor 86 and the fan 88. The motor 86, the fan 88, and the control circuit board 196 are aligned along the front-to-rear direction.

[0110] As in Fig. As shown in Figure 26, the disk shell 197 is arranged in the disk receiving space 203. The disk shell 197 is arranged in front of the inlet opening 202. The disk shell 197 is positioned between the control circuit board 196 and the inlet opening 202. The disk shell 197 supports the control circuit board 196. The control circuit board 196 is arranged inside the disk shell 197. The disk shell 197 is fixed to the inner case part 190. The disk shell 197 has heat-dissipating fins 204. The heat-dissipating fins 204 have a flat plate shape extending in the up-down and front-back directions. The inner housing part 199 has a through-hole 199a penetrating a rear end of the inner housing part 199, and the heat-dissipating fins 204 extend through the through-hole 199a. The heat-dissipating fins 204 are opposite the intake port 202 in the front-to-rear direction.

[0111] The tubular vibration-proof component 104 is arranged in front of the plate housing 192 and behind the rear bracket 112. The tubular vibration-proof component 104 is made of an elastic material. A material of the tubular vibration-proof component 104 is the same as the material of the first right vibration-proof component 170 (see Fig. 18). The tubular vibration-proof member 104 has a tubular shape. The tubular shape includes a bellows shape having a circular cross-section. The tubular vibration-proof member 104 has an air passage 208 therein. The tubular vibration-proof member 104 is fixed to each of a front end of the plate housing 192 and a rear end of the rear bracket 112. The front end of the plate housing 192 is open, and the tubular vibration-proof member 104 encloses the front end of the plate housing 192. The air passage 208 is connected to the interior space 200 through the front end of the plate housing 192. The tubular vibration-proof component 104 encloses the engine inlet opening 128 of the rear bracket 112. The air passage 208 is connected to the fan receiving chamber 126 via the engine inlet opening 128. As shown in Fig. 13, when the motor unit 10 is viewed along the front-to-rear direction, the air passage 208 at least partially overlaps each of the motor 86 and the blower 88.

[0112] When the control circuit board 196 controls the motor 86 to operate, the motor shaft 140 rotates and the fan 88 rotates. As shown in Fig. As shown in Figure 15, air flows from outside the motor unit 10 through the air inlet opening 26a and into the accommodation space 18 of the body case 12. In the drawing, the air flow is indicated by an arrow line with a symbol F1. The incoming air flows rearward between the motor case 84 and the plate member 92, between the plate member 92 and the support plate 184, and between the support plate 184 and the upper wall 20c of the body case 12.

[0113] As in Fig. As shown in Figure 26, air flows around the outer housing part 198, then passes through the inlet opening 202 and flows into the interior space 200. The incoming air passes through the filter member 194 and flows upward between the outer housing part 198 and the inner housing part 199 along the heat-dissipating fins 204. As the air passes through the filter member 194, foreign particles contained in the flowing air are removed. Furthermore, the control circuit board 196 is cooled as the air flows along the heat-dissipating fins 204. The air then flows forward between the outer housing part 198 and the inner housing part 199, through the air passage 208 of the tubular vibration-proof member 104 and the motor inlet opening 128 of the rear bracket 112, and then flows from the interior space 200 into the fan receiving space 126.

[0114] As in Fig. As shown in Fig. 15, the air flowing into the fan accommodation space 126 is sent by the fan 88 in a direction away from the central axis 140a (outward in a radial direction of the fan 88). The air then flows from the fan accommodation space 126 into the motor accommodation space 122. The air flowing into the motor accommodation space 122 flows forward inside and outside the motor 86. This cools the motor 86. The air then passes through the exhaust port 124 of the front bracket 110 and is discharged from the motor accommodation space 122 to the outside of the motor unit 10.

[0115] As in Fig. 2, 3 and 27 to 33, the motor unit 10 can be applied to several types of working units 4. In Fig. 2, 3, and 27 to 33, the coordinate system is changed to a different coordinate system from the coordinate system for the motor unit 10 described above. Specifically, a direction perpendicular to the placement surface P1 may be referred to as the up-down direction, a direction perpendicular to the up-down direction may be referred to as the front-back direction, and a direction perpendicular to both the up-down and front-back directions may be referred to as the left-right direction.

[0116] As in Fig. As shown in Figure 27, the motor unit 10 is configured to be attached to a rammer 4a. The rammer 4a is a soil compactor that compacts the soil. The rammer 4a includes an upper housing 300, a handle unit 302, and a working part 304. The upper housing 300 includes a fixing platform 308 disposed at a rear upper portion thereof. The fixing platform 308 is fixed to the second fixing surface 150a of the motor unit 10.

[0117] Before describing a detailed design of the fixation platform 308, a detailed design of the second fixation part 150 of the motor unit 10 will be described. As shown in Fig. As shown in Fig. 28, the second fixing part 150 has two positioning holes 150b, four first fixing holes 150c, four second fixing holes 150d, and one auxiliary hole 150e. The positioning holes 150b, the first fixing holes 150c, the second fixing holes 150d, and the auxiliary hole 150e are defined in the second fixing surface 150a. An arrangement of the two positioning holes 150b, the four first fixing holes 150c, the four second fixing holes 150d, and the auxiliary hole 150e is the same as an arrangement of a plurality of holes in an internal combustion engine unit adapted to be attached to the rammer 4a. Therefore, the engine unit 10 can be used by fixing the second fixing part 150 to the working unit 4 to which the internal combustion engine unit can be attached.

[0118] Each of the two positioning holes 150b is spaced a certain distance from the central axis 140a of the motor shaft 140. The two positioning holes 150b are arranged 180° apart around the central axis 140a. The two positioning holes 150b are arranged on the vertical plane P2.

[0119] Each of the four first fixing holes 150c is separated from the central axis 140a by a certain distance. The four first fixing holes 150c are arranged at 90° intervals around the central axis 140a. A distance between the first fixing holes 150c and the central axis 140a is slightly shorter than a distance between the positioning holes 150b and the central axis 140a. Two of the first fixing holes 150c are arranged to the right of the vertical plane P2, and the remaining two first fixing holes 150c are arranged to the left of the vertical plane P2.

[0120] Each of the four second fixing holes 150d is separated from the central axis 140a by a certain distance. A distance between the second fixing holes 150d and the central axis 140a is greater than a distance between the positioning holes 150b and the central axis 140a. Two of the second fixing holes 150d are located to the right of the vertical plane P2, and the remaining two second fixing holes 150d are located to the left of the vertical plane P2. The auxiliary hole 150e is slightly farther from the central axis 140a than the second fixing holes 150d.

[0121] As in Fig. As shown in Figure 29, the fixation platform 308 has two positioning holes 308a and four fixing holes 308b. An arrangement of the two positioning holes 308a and four fixing holes 308b is identical to an arrangement of the two positioning holes 150b and four second fixing holes 150d in the second fixing part 150.

[0122] As in Fig. 29 and Fig. 30, when the second fixing part 150 is fixed to the fixing platform 308, first, each of two positioning pins 309a is inserted into a corresponding one of the positioning holes 308a and into a corresponding one of the positioning holes 150b. This positions the second fixing part 150 with respect to the fixing platform 308. As a result, the fixing holes 308b are opposed to the second fixing holes 150d. Next, each of four screws 309b is inserted into a corresponding one of the fixing holes 308b and screwed into a corresponding one of the second fixing holes 150d. As a result, the second fixing part 150 is fixed to the fixing platform 308, with the second fixing part 150 positioned with respect to the fixing platform 308.When the second fixing part 150 is fixed to the fixing platform 308, the motor shaft 140 of the motor unit 10 protrudes from the body case 12 toward a lower front side.

[0123] As in Fig. 2, the handle assembly 302 includes a first handle 310, a second handle 312, and a third handle 314. The first handle 310 extends rearward from an upper end of the upper housing 300, then bends to extend to the right, and further bends to extend forward. The first handle 310 encloses the motor assembly 10. The second handle 312 extends upward from the upper end of the upper housing 300, then bends to extend to the right, and then further bends to extend downward. The third handle 314 extends forward and downward from the upper end of the upper housing 300, then bends to extend to the right, and further bends to extend rearward and upward. The first handle 310, the second handle 312 and the third handle 314 are integrally formed.At least one of the first handle 310, the second handle 312, and the third handle 314 is grasped by the user during operation.

[0124] As in Fig. As shown in Fig. 27, the working part 304 includes a bellows part 320, a tamper part 322, a shaft receiving part 324, and a drive part 326. The bellows part 320 is fixed to a lower portion of the upper housing 300. The bellows part 320 is expandable and contractible. The tamper part 322 is disposed on a bottom surface of the upper housing 300. An upper portion of the tamper part 322 is surrounded by the bellows part 320. The tamper part 322 is fixed to the bellows part 320. The tamper part 322 includes a tamper plate 328 disposed at a lower end of the tamper part 322. The tamper plate 328 is in surface contact with the placement surface P1.

[0125] The shaft receiving part 324 and the drive part 126 are arranged within the upper housing 300. The shaft receiving part 324 is fixed to the motor shaft 140 of the motor unit 10. The drive part 326 is fixed to the shaft receiving part 324. The drive part 326 drives the tamper part 322 when the motor shaft 140 rotates. As a result, a release movement that moves the tamper part 322 away from the placement surface P1 and an approach movement that moves the tamper part 322 closer to the placement surface P1 are repeatedly performed. The tamper plate 328 is repeatedly pressed against the placement surface P1, thereby hardening the placement surface P1, such as the floor.

[0126] As in Fig. As shown in Figure 31, the motor unit 10 can be attached to the vibrating plate 4b. The vibrating plate 4b is a soil compactor that compacts the soil. The force with which the vibrating plate 4b compacts the soil is smaller than the force with which the rammer 4a compacts the soil. The vibrating plate 4b includes a base 350, a handle unit 352, a transmission device 354, and a working part 356.

[0127] The base 350 has a fixation platform 360. The fixation platform 360 is fixed to the first fixation surface 148a of the motor unit 10.

[0128] Before describing a detailed configuration of the fixation platform 360, a detailed configuration of the first fixation part 148 of the motor unit 10 will be described. As shown in Fig. As shown in Fig. 32, the first fixing part 148 has a first positioning hole 148b, a second positioning hole 148c, a first fixing hole 148d, and a second fixing hole 148e. The first positioning hole 148b, the second positioning hole 148c, the first fixing hole 148d, and the second fixing hole 148e are arranged in the first fixing surface 148a. The first positioning hole 148b, the second positioning hole 148c, the first fixing hole 148d, and the second fixing hole 148e penetrate the first fixing part 148 in the up-down direction. An arrangement of the first positioning hole 148b, the second positioning hole 148c, the first fixing hole 148d, and the second fixing hole 148e is the same as an arrangement of holes in an internal combustion engine unit adapted to be attached to the vibrating plate 4b.Furthermore, a distance between the first fixing surface 148a and the central axis 140a of the motor shaft 140 (see . Fig. 28) is the same as a distance between a fixing surface of the internal combustion engine unit and a shaft of the internal combustion engine. Therefore, the engine unit 10 can be used by fixing the first fixing part 148 to the working unit 4 to which the internal combustion engine unit is adapted to be fixed.

[0129] The first and second positioning holes 148b and 148c are located at a front end of the first fixing part 148. The first positioning hole 148b and the second positioning hole 148c are aligned in the left-right direction. The first positioning hole 148b is a round hole. The second positioning hole 148c is an elongated hole extending in the left-right direction.

[0130] The first and second fixing holes 148d and 148e are located at a rear end of the first fixing part 148. The first fixing hole 148d and the second fixing hole 148e are aligned in the left-right direction. The first fixing hole 148d and the first positioning hole 148b are aligned in the front-back direction. A shape of the first fixing hole 148d is substantially identical to that of the first positioning hole 148b. The second fixing hole 148e and the second positioning hole 148c are aligned in the front-back direction. A shape of the second fixing hole 148e is substantially identical to that of the second positioning hole 148c.

[0131] The fixing platform 360 includes a first positioning protrusion 361a, a second positioning protrusion 361b, a first fixing hole 361c, and a second fixing hole 361d. The first and second positioning protrusions 361a and 361b protrude upward from an upper surface 360a of the fixing platform 360. The first and second positioning protrusions 361a and 361b have a cylindrical shape. The first and second positioning protrusions 361a and 361b are aligned in the left-right direction.

[0132] The first fixing hole 361c and the second fixing hole 361d are aligned in the left-right direction. The first fixing hole 361c and the first positioning protrusion 361a are aligned in the front-back direction. The second fixing hole 361d and the second positioning protrusion 361b are aligned in the front-back direction.

[0133] The first fixing hole 361c includes a first elongated hole portion 361c1 extending in the front-to-back direction and a first round hole portion 361c2 located at a lower end of the first elongated hole portion 361c1. The second fixing hole 361d includes a second elongated hole portion 361d1 extending in the front-to-back direction and a second round hole portion 361d2 located at a lower end of the second elongated hole portion 361d1.

[0134] When the first fixing part 148 is fixed to the fixing platform 360, first, the first positioning protrusion 361a is inserted into the first positioning hole 148b, and the second positioning protrusion 361b is inserted into the second positioning hole 148c. Due to this, the first fixing part 148 is positioned with respect to the fixing platform 360. Furthermore, since the second positioning hole 148c is a long hole, the first fixing part 148 can be positioned with respect to the fixing platform 360 even if a distance between the first positioning protrusion 361a and the second positioning protrusion 361b varies from product to product. Next, a screw 362a is inserted into the first fixing hole 361c and the first long hole part 361c1 from above the first fixing part 148 and screwed to the first round hole part 361c2.Next, a screw 362a is inserted into the second fixing hole 361d and the second elongated hole portion 361d1 from above the first fixing portion 148 and screwed to the second round hole portion 361d2. Then, each of two nuts 362b is screwed onto the first positioning protrusion 361a and the second positioning protrusion 361b. Due to this, the first fixing portion 148 is fixed to the upper surface 360a of the fixing platform 360, with the first fixing portion 148 positioned relative to the fixing platform 360. When the first fixing portion 148 is fixed to the fixing platform 360, the motor shaft 140 of the motor unit 10 extends in the left-right direction.

[0135] As in Fig. As shown in Figure 3, the handle unit 352 includes a first handle 364 and a second handle 366. The first handle 364 extends rearward and upward from a rear end of the base 350, then bends to extend to the right, and further bends to extend forward and downward. The first handle 364 is disposed behind the motor unit 10. The first handle 364 is configured to be grasped by the user during operation.

[0136] The second handle 366 extends upward from the rear end of the base 350, then bends to extend forward and upward, then further bends to extend forward, and then further bends to extend downward. The second handle 366 is arranged to surround the motor unit 10. The second handle 366 is designed to be grasped by the user when, for example, the vibrating plate 4b is to be lifted.

[0137] As in Fig. As shown in Figure 31, the transmission device 354 includes a first pulley 370, a belt 372, and a second pulley 374. The first pulley 370 is fixed to the motor shaft 140. The belt 372 is tensioned between the first pulley 370 and the second pulley 374. The second pulley 374 is positioned in front of the first pulley 370.

[0138] The working part 356 includes an exciter 378 and a tamper plate 380. The exciter 378 is fixed to the second pulley 374. The exciter 378 allows the tamper plate 380 to operate when the second pulley 374 rotates. As a result, the tamper plate 380 moves in the up-down direction. As the tamper plate 380 is repeatedly pressed against the placement surface P1, the placement surface P1, such as the floor, is hardened.

[0139] If the rammer 4a (see Fig. 27) or the vibrating plate 4b is operated, the rammer 4a or the vibrating plate 4b vibrates. This causes the vibration of the rammer 4a or the vibrating plate 4b to be transmitted to the motor unit 10 via the motor shaft 140. As shown in Fig. As shown in Figure 22, the vibration transmitted to the motor shaft 340 is transmitted from the motor 86 to the motor housing 84. The vibration is then transmitted from the motor housing 84 to the plate member 92 and then to the vibration-proof part 94. Once the vibration is transmitted to the vibration-proof part 94, the first right vibration-proof member 170, the second right vibration-proof member 172 (see Fig. 18) and the third right vibration-proof component 174 (see Fig. 18) elastically in the up-down, left-right and front-back directions between the right wall 154a of the plate member 92 and the right cover member 96, and the first left vibration-proof member 176, the second left vibration-proof member 178 (see Fig. 18) and the third left vibration-proof component 180 (see Fig. 18) deform elastically in the up-down, left-right, and front-back directions between the left wall 154b of the plate member 92 and the left cover member 98. Due to this, the vibration is damped and the transmission of the vibration to the right cover member 96 and the left cover member 98 is suppressed. Thus, the vibration is suppressed from being transmitted via the body case 12 to the battery packs BP (see Fig. 4) is transmitted, and it is suppressed that the vibration is transmitted via the support unit 100 to the control circuit board 196 (see Fig. 26) of the control unit 102.

[0140] Furthermore, as in Fig. 26, the vibration transmitted to the motor housing 84 is transmitted to the tubular vibration-proof member 104. When the vibration is transmitted to the tubular vibration-proof member 104, the tubular vibration-proof member 104 elastically deforms between the motor housing 84 and the plate housing 192 in the up-down, left-right, and front-back directions. This dampens the vibration and suppresses its transmission to the plate housing 192. Thus, the vibration is suppressed from being transmitted to the control circuit board 196.

[0141] As in Fig. As shown in Fig. 33, the motor unit 10 is adapted to be attached to a grass cutter 4c. The grass cutter 4c is a device adapted to cut grass. The grass cutter 4c includes a housing 400, a pair of front wheels 402, a pair of rear wheels 404, a handle unit 406, and a working part 408. The housing 400 has a fixing platform 412 disposed on the top. The fixing platform 412 is fixed to the second fixing surface 150a of the motor unit 10. The motor shaft 140 of the motor unit 10 projects downward from the body case 12.

[0142] The pair of front wheels 402 is rotatably mounted on a front portion of the housing 400. The pair of rear wheels 404 is rotatably mounted on a rear portion of the housing 400. As the pair of front wheels 402 and the pair of rear wheels 404 rotate, the slope mower 4c moves on the placement area P1.

[0143] The handle unit 406 includes a fixed frame 416, a handle 418, and a push button 420. The fixed frame 416 has a substantially U-shape. Both ends of the fixed frame 416 in its longitudinal direction are fixed to the housing 400.

[0144] The handle 418 is attached to a top surface of the fixed frame 416. The user moves the embankment mower 4c by grasping the handle 418 and pushing it forward.

[0145] The pusher 420 is pivotally mounted on the handle 418. The pusher 420 is actuated by a user's hand grasping the handle 418, causing it to move closer to the handle 418. When the pusher 420 is actuated, the motor 86 of the motor unit 10 is activated.

[0146] The working part 408 has a coupling 424, a gear shaft 426, and a blade (a cutting blade) 428. The coupling 424 connects the motor shaft 140 and the gear shaft 426.

[0147] The gear shaft 426 extends in the up-down direction. The gear shaft 426 rotates around the central axis 140a, which extends in the up-down direction, integrally with the motor shaft 140.

[0148] The blade 428 is fixed to a lower end of the gear shaft 426. The blade 428 rotates together with the gear shaft 426 about the central axis 140a. As a result, the grass is cut. (effects)

[0149] The motor unit 10 in the present embodiment is adapted to be detachably attached to the working unit 4 for driving the working unit 4.The motor unit 10 includes the motor 86 having the motor shaft 140 extending in the front-to-back direction (example of first direction) and configured to drive the working unit 4, the control circuit board 196 configured to control the motor 86, the motor housing 84 supporting the motor 86, the body housing 12 disposed on the outer side of the control circuit board 196 and the motor housing 84, the first fixing part 148 configured to be fixed to the working unit 4, the first right vibration-proof member 170 (example of first vibration-proof member) disposed between the body housing 12 and the motor housing 84, and the first left vibration-proof member 176 (example of second vibration-proof member) disposed between the body housing 12 and the motor housing 84.The first fixing part 148 is configured to be placed on the placement surface P1 when the motor unit 10 is placed on the placement surface P1, which first fixing part 148 is arranged substantially parallel to the motor shaft 140. In the up-down direction perpendicular to the placement surface P1, at least a part of the first right vibration-proof member 170 and at least a part of the first left vibration-proof member 176 are arranged below the upper end of the motor 86 when the motor unit 10 is placed on the placement surface P1. When the motor unit 10 is viewed along the front-back direction, the motor 86 is arranged between the first right vibration-proof member 170 and the first left vibration-proof member 176.

[0150] According to the above configuration, at least a part of the first right vibration-proof member 170 and at least a part of the first left vibration-proof member 176 are disposed below the upper end of the motor 86, and the first right vibration-proof member 170 and the first left vibration-proof member 176 are arranged with the motor 86 between them. Therefore, the first right vibration-proof member 170 and the first left vibration-proof member 176 are arranged symmetrically with respect to the motor 86. This allows the vibration of the motor 86 to be sufficiently damped.

[0151] The motor shaft 140 extends along the placement surface P1 when the motor unit 10 is placed on the placement surface P1. The first right vibration-proof component 170 and the first left vibration-proof component 176 are arranged below the central axis 140a of the motor shaft 140 when the motor unit 10 is placed on the placement surface P1.

[0152] In general, the component(s) of the motor unit 10 are often arranged in the space above the upper end of the motor 86. According to the above configuration, available space below the central axis 140a of the motor shaft 140 can be utilized.

[0153] Further, the first right vibration-proof member 170 and the first left vibration-proof member 176 are arranged above the lower end of the motor 86 when the motor unit 10 is placed on the placement surface P1.

[0154] According to the above configuration, the available space between the center axis 140a of the motor shaft 140 and the lower end of the motor 86 can be utilized.

[0155] Furthermore, the first right vibration-proof component 170 is spaced the first distance from the vertical plane P2 perpendicular to the placement surface P1 and including the front-to-back direction. The first left vibration-proof component 176 is spaced the first distance from the vertical plane P2.

[0156] According to the above configuration, the distance between the first right vibration-proof member 170 and the vertical plane P2 is the same as the distance between the first left vibration-proof member 176 and the vertical plane P2. Therefore, the first right vibration-proof member 170 and the first left vibration-proof member 176 are arranged symmetrically with respect to the vertical plane P2. This allows the vibration of the motor 86 to be more dampened.

[0157] The position of the center of gravity G1 of the motor unit 10 in the front-rear direction is substantially the same as each of the center position of the first right vibration-proof member 170 in the front-rear direction and the center position of the first left vibration-proof member 176 in the front-rear direction.

[0158] According to the above configuration, the vibration of the motor 86 can be more damped.

[0159] The motor unit 10 further includes the second right vibration-proof member 170 (example of the third vibration-proof member) arranged between the body case 12 and the motor case 84, and the second left vibration-proof member 178 (example of the fourth vibration-proof member) arranged between the body case 12 and the motor case 84. At least a part of the second right vibration-proof member 172 and at least a part of the second left vibration-proof member 178 are arranged above the central axis 140a of the motor shaft 140 when the motor unit 10 is placed on the placement surface P1. When the motor unit 10 is viewed along the front-rear direction, the motor 86 is arranged between the second right vibration-proof member 172 and the second left vibration-proof member 178.

[0160] According to the above configuration, the vibration of the motor 86 can be more damped compared to a configuration in which the motor unit 10 has only the first right vibration-proof member 170 and the first left vibration-proof member 176.

[0161] The second right vibration-proof component 172 is arranged on the same side as the first right vibration-proof component 170 relative to the vertical plane P2 perpendicular to the placement surface P1 and including the front-to-back direction. The second left vibration-proof component 178 is arranged on the same side as the first left vibration-proof component 176 relative to the vertical plane P2. The distance between the first right vibration-proof component 170 and the second right vibration-proof component 172 is substantially the same as the distance between the first left vibration-proof component 176 and the second left vibration-proof component 178.

[0162] According to the above configuration, the second right vibration-proof member 172 and the second left vibration-proof member 178 are arranged symmetrically with respect to the vertical plane P2. This allows the vibration of the motor 86 to be more dampened.

[0163] Furthermore, the motor unit 10 further includes the plate member 92 fixed to the motor housing 84. The first right vibration-proof member 170 and the first left vibration-proof member 176 are fixed to the plate member 92 and the body housing 12.

[0164] In a configuration in which the first right vibration-proof member 170 and the first left vibration-proof member 176 are directly fixed to the motor housing 84, the configuration of the motor housing 84 becomes complicated. According to the above configuration, the configuration of the motor housing 84 can be suppressed from becoming complicated.

[0165] The motor unit 10 further comprises the second fixing part 150, which is designed to be fixed to a working unit 4 of a different type from the working unit 4, which is fixed to the first fixing part 148.

[0166] According to the above configuration, the number of types of working units 4 adapted to use the motor unit 10 can be increased.

[0167] The motor unit 10 further includes the fan 88, which is fixed to the motor 86, the plate housing 192, which supports the control circuit board 196, and the tubular vibration-proof component 104, which is arranged between the motor housing 84 and the plate housing 192 and has a tubular shape. As the fan 88 rotates, the air cools the control circuit board 196 and flows inside the tubular vibration-proof component 104.

[0168] According to the above configuration, when the motor 86 vibrates, the tubular vibration-proof member 104 dampens the vibration of the motor 86. In addition, the air that cools the control circuit board 196 passes inside the tubular vibration-proof member 104. By using the tubular vibration-proof member 104, the vibration of the motor 86 can be suppressed and the control circuit board 196 can be cooled with only one component.

[0169] The body case 12 has the first battery receptacle 22 configured to accommodate the first battery pack BP1 (example of first battery) configured to supply power to the motor 86, which is detachably attached thereto, and the second battery receptacle 24 configured to accommodate the second battery pack BP2 (example of second battery) configured to supply power to the motor 86, which is detachably attached thereto.

[0170] According to the above configuration, the output of the motor unit 10 can be increased and / or the operating time of the motor unit 10 can be extended.

[0171] When the motor unit 10 is viewed along the front-to-back direction, the control circuit board 196 at least partially overlaps the motor 86.

[0172] According to the above configuration, when the motor unit 10 is viewed along the front-rear direction, the motor unit 10 can be suppressed from becoming larger in the direction perpendicular to the front-rear direction compared to a configuration in which the control circuit board 196 does not even at least partially overlap the motor 86.

[0173] The motor unit 10 in the present embodiment is adapted to be detachably attached to the working unit 4 for driving the working unit 4.The motor unit 10 includes the motor 86 having the motor shaft 140 extending in the front-to-back direction (example of first direction) and configured to drive the working unit 4, the control circuit board 196 configured to control the motor 86, the motor housing 84 supporting the motor 86, the body housing 12 disposed on the outer side of the control circuit board 196 and the motor housing 84, the second fixing part 150 configured to be fixed to the working unit 4, the first right vibration-proof member 170 (example of first vibration-proof member) disposed between the body housing 12 and the motor housing 84, and the first left vibration-proof member 176 (example of second vibration-proof member) disposed between the body housing 12 and the motor housing 84. The motor shaft 140 is substantially perpendicular to the second fixing part 150.In the up-down direction perpendicular to the placement surface P1, at least a part of the first right vibration-proof member 170 and at least a part of the first left vibration-proof member 176 are arranged below the upper end of the motor 86 when the motor unit 10 is placed on the placement surface P1. When the motor unit 10 is viewed along the front-back direction, the motor 86 is arranged between the first right vibration-proof member 170 and the first left vibration-proof member 176.

[0174] According to the above configuration, at least a part of the first right vibration-proof member 170 and at least a part of the first left vibration-proof member 176 are disposed below the upper end of the motor 86, and the first right vibration-proof member 170 and the first left vibration-proof member 176 are arranged with the motor 86 between them. Therefore, the first right vibration-proof member 170 and the first left vibration-proof member 176 are positioned symmetrically with respect to the motor 86. This allows the vibration of the motor 86 to be sufficiently damped.

[0175] The motor shaft 140 extends along the placement surface P1 when the motor unit 10 is placed on the placement surface P1. The first right vibration-proof component 170 and the first left vibration-proof component 176 are arranged below the central axis 140a of the motor shaft 140 when the motor unit 10 is placed on the placement surface P1.

[0176] In general, the component(s) of the motor unit 10 are often arranged in the space above the upper end of the motor 86. According to the above configuration, the available space below the central axis 140a of the motor shaft 140 can be utilized.

[0177] The first right vibration-proof component 170 is spaced the first distance from the vertical plane P2 perpendicular to the placement surface P1 and including the front-to-back direction. The first left vibration-proof component 176 is spaced the first distance from the vertical plane P2.

[0178] According to the above configuration, the distance between the first right vibration-proof member 170 and the vertical plane P2 is the same as the distance between the first left vibration-proof member 176 and the vertical plane P2. Therefore, the first right vibration-proof member 170 and the first left vibration-proof member 176 are arranged symmetrically with respect to the vertical plane P2. For example, when the motor 86 vibrates, the first right vibration-proof member 170 and the first left vibration-proof member 176 deform more uniformly. This allows the vibration of the motor 86 to be more dampened.

[0179] The body case 12 has the first battery receptacle 22 configured to accommodate the first battery pack BP1 (example of first battery) configured to supply power to the motor 86, which is detachably attached thereto, and the second battery receptacle 24 configured to accommodate the second battery pack BP2 (example of second battery) configured to supply power to the motor 86, which is detachably attached thereto.

[0180] According to the above configuration, the output of the motor unit 10 can be increased and / or the operating time of the motor unit 10 can be extended.

[0181] The motor unit 10 in the present embodiment is adapted to be detachably attached to the working unit 4 for driving the working unit 4.The motor unit 10 includes the motor 86 having the motor shaft 140 extending in the front-to-back direction (example of the first direction) and configured to drive the working unit 4, the control circuit board 196 configured to drive the motor 86, the fan 88 fixed to the motor 86, the motor housing 84 supporting the motor 86, the plate housing 192 supporting the control circuit board 196, the body housing 12 arranged on the outer side of the motor housing 84 and the plate housing 192, the fixing unit 90 configured to be fixed to the working unit 4, and the tubular vibration-proof member 104 arranged between the motor housing 84 and the plate housing 192 and having a tubular shape. As the fan 88 rotates, the air cools the control circuit board 196 and passes inside the interior of the tubular vibration-proof component 104.

[0182] According to the above configuration, when the motor 86 vibrates, the tubular vibration-proof member 104 dampens the vibration of the motor 86. Furthermore, air that cools the control circuit board 196 passes within the tubular vibration-proof member 104. By using the tubular vibration-proof member 104, the vibration of the motor 86 can be suppressed and the control circuit board 196 can be cooled with only one component. This reduces the number of parts in the motor unit 10.

[0183] The motor unit 10 further includes the plate member 92 fixed to the motor housing 84, the support unit 100 supporting the plate housing 192, and the vibration-proof part 94 (example of vibration-proof member) fixed to the plate member 92 and the support unit 100.

[0184] According to the above configuration, the vibration of the motor 86 is damped by the tubular vibration-proof member 104 and the vibration-proof part 94. This suppresses the vibration from being transmitted to the control circuit board 196.

[0185] When the motor unit 10 is viewed along the front-to-rear direction, the tubular vibration-proof member 104 at least partially overlaps the motor 86.

[0186] According to the above configuration, when the motor unit 10 is viewed along the front-rear direction, the motor unit 10 can be suppressed from becoming larger in the direction perpendicular to the front-rear direction compared to a configuration in which the tubular vibration-proof member 104 does not even overlap at least partially with the motor 86.

[0187] Furthermore, the body case 12 has the first battery receptacle 22 configured to include the first battery pack BP1 (example of first battery) configured to supply power to the motor 86, which is detachably attached thereto, and the second battery receptacle 24 configured to include the second battery pack BP2 (example of second battery) configured to supply power to the motor 86, which is detachably attached thereto.

[0188] According to the above configuration, the output of the motor unit 10 can be increased and / or the operating time of the motor unit 10 can be extended. (Second embodiment)

[0189] In a second embodiment, points different from the first embodiment will be described. As in Fig. 34, in the second embodiment, the first battery receptacle 22 and the second battery receptacle 24 are arranged on the rear wall 20d of the receptacle part 20. The first battery receptacle 22 and the second battery receptacle 24 are arranged side by side in the left-right direction. When the motor unit 10 is viewed along the front-back direction, the first battery receptacle 22 does not overlap the second battery receptacle 24.

[0190] The first battery pack BP1 is attached to the first battery receptacle 22 by sliding it in the attachment direction D1, and removed from the first battery receptacle 22 by sliding it in the removal direction D2, opposite to the attachment direction D1. The attachment direction D1 is downward. The removal direction D2 is upward. The second battery pack BP2 is attached to the second battery receptacle 24 by sliding it in the attachment direction D1, and removed from the second battery receptacle 24 by sliding it in the removal direction D2. (Third embodiment)

[0191] In a third embodiment, points different from the first embodiment will be described. As in Fig. As shown in Figure 35, in the third embodiment, the first battery receptacle 22 and the second battery receptacle 24 are arranged on the left wall 20e of the receptacle part 20. The first battery receptacle 22 and the second battery receptacle 24 are arranged side by side in the front-to-back direction. When the motor unit 10 is viewed along the left-to-right direction, the first battery receptacle 22 does not overlap the second battery receptacle 24.

[0192] The first battery pack BP1 is attached to the first battery receptacle 22 by sliding it in the attachment direction D1, and removed from the first battery receptacle 22 by sliding it in the removal direction D2, opposite to the attachment direction D1. The attachment direction D1 is downward. The removal direction D2 is upward. The second battery pack BP2 is attached to the second battery receptacle 24 by sliding it in the attachment direction D1, and removed from the second battery receptacle 24 by sliding it in the removal direction D2. (Fourth embodiment)

[0193] In a fourth embodiment, points different from the first embodiment will be described. As shown in Fig. As shown in Fig. 36, the first right vibration-proof member 170 is positioned above the center of gravity G1 of the motor unit 10 and the center axis 140a of the motor shaft 140. The center of the first right vibration-proof member 170 in the up-down direction is located below the upper end 86a of the motor 86. The upper end of the first right vibration-proof member 170 is located above the upper end 86a of the motor 86. With respect to the front-back direction, the position of the center of the first right vibration-proof member 170 is substantially identical to the position of the center of gravity G1 of the motor unit 10.

[0194] The second right vibration-proof component 172 and the third right vibration-proof component 174 are arranged below the center of gravity G1 and the center axis 140a of the motor unit 10. The second right vibration-proof component 172 and the third right vibration-proof component 174 are arranged above the lower end 86b of the motor 86. With respect to the front-to-rear direction, the position of the center between the second right vibration-proof component 172 and the third right vibration-proof component 174 is substantially identical to the position of the center of gravity G1 of the motor unit 10.

[0195] The position of the first left vibration-proof component 176 (see Fig. 21) in the front-to-back direction is substantially identical to the position of the first right vibration-proof component 170 in the front-to-back direction. The position of the first left vibration-proof component 176 in the up-down direction is substantially identical to the position of the first right vibration-proof component 170 in the up-down direction. The position of the second left vibration-proof component 178 (see Fig. 21) in the front-to-back direction is substantially identical to the position of the second right vibration-proof component 172 in the front-to-back direction. The position of the second left vibration-proof component 178 in the up-down direction is substantially identical to the position of the second right vibration-proof component 172 in the up-down direction. The position of the third left vibration-proof component 180 (see Fig. 21) in the front-to-back direction is substantially identical to the position of the third right vibration-proof component 174 in the front-to-back direction. The position of the third left vibration-proof component 180 in the up-and-down direction is substantially identical to the position of the third right vibration-proof component 174 in the up-down direction. (Fifth embodiment)

[0196] In a fifth embodiment, points different from the first embodiment will be described. As in Fig. 37, the vibration-proof part 94 has only the first right vibration-proof component 170 and the first left vibration-proof component 176. In Fig.37, the first right vibration-proof member 170 is marked with a mark 176 on the outer surface of the first right vibration-proof member 170, making the position of the first left vibration-proof member 176 easier to understand. The shape of the first right vibration-proof member 170 in the fifth embodiment is different from the shape of the first right vibration-proof member 170 of the first embodiment, and the shape of the first left vibration-proof member 176 in the fifth embodiment is different from the shape of the first left vibration-proof member 176 of the first embodiment.

[0197] The first right vibration-proof member 170 has a triangular ring shape. With respect to the front-to-rear direction, the position of the center CP of the first right vibration-proof member 170 is identical to the position of the center of gravity G1 of the motor unit 10. The center CP of the first right vibration-proof member 170 is located above the center of gravity G1 of the motor unit 10 and the center axis 140a of the motor shaft 140. The upper end of the first right vibration-proof member 170 is located above the upper end 86a of the motor 86. The lower end of the first right vibration-proof member 170 is located below the lower end 86b of the motor 86. At least a portion of the first right vibration-proof member 170 is located below the upper end 86a of the motor 86.

[0198] The shape of the first left vibration-proof component 176 is substantially identical to the shape of the first right vibration-proof component 170. The position of the first left vibration-proof component 176 in the front-back direction is substantially identical to the position of the first right vibration-proof component 170 in the front-back direction. The position of the first left vibration-proof component 176 in the up-down direction is substantially identical to the position of the first right vibration-proof component 170 in the up-down direction. (Variants)

[0199] The motor unit 10 in one embodiment may have three or more battery receptacles. In this case, three or more battery packs BP may be attached to the body housing 12.

[0200] In one embodiment of the motor unit 10, the attachment direction D1 of the first battery pack BP1 may be different from the attachment direction of the second battery pack BP2. The removal direction D2 of the first battery pack BP1 may be different from the removal direction of the second battery pack BP2.

[0201] In the motor unit 10 of the above embodiment, the first right vibration-proof member 170, the second right vibration-proof member 172, and the third right vibration-proof member 174 are fixed to the right wall 154a of the plate member 92. In a variation, the number of vibration-proof members fixed to the right wall 154a of the plate member 92 is not limited to three, but may be two or fewer, or four or more.

[0202] In the motor unit 10 of the above embodiment, the first left vibration-proof member 176, the second left vibration-proof member 178, and the third left vibration-proof member 180 are fixed to the left wall 154b of the plate member 92. In a variation, the number of vibration-proof members fixed to the left wall 154b of the plate member 92 is not limited to three, but may be two or fewer, or four or more. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2020 / 049617 A1

[0002]

Claims

[1] A motor unit (10) adapted to be removably mounted on a working unit (4) for driving the working unit (4), comprising: a motor (86) having a motor shaft (140) extending in a first direction and configured to drive the working unit (4); a control circuit board (196) configured to control the motor (86); a motor housing (84) supporting the motor (86); a body housing (12) disposed on an outer side of the control circuit board (196) and the motor housing (84); a first fixing part (148) adapted to be fixed to the working unit (4); a first vibration-proof component (170) arranged between the body housing (12) and the motor housing (84); and a second vibration-proof component (176) arranged between the body housing (12) and the motor housing (84), at the the first fixing part (148) is designed to be placed on a placement surface (P1) when the motor unit (10) is placed on the placement surface (P1), which first fixing part (148) is arranged substantially parallel to the motor shaft (140), in a top-bottom direction perpendicular to the placement surface (P1), at least a part of the first vibration-proof component (170) and at least a part of the second vibration-proof component (176) are arranged below an upper end of the motor (86) when the motor unit (10) is placed on the placement surface (P1), and when the motor unit (10) is viewed along the first direction, the motor (86) is arranged between the first vibration-proof component (170) and the second vibration-proof component (176). [2] Motor unit (10) according to claim 1, wherein the motor shaft (140) extends along the placement surface (P1) when the motor unit (10) is placed on the placement surface (P1), and the first vibration-proof component (170) and the second vibration-proof component (176) are arranged below a central axis (140a) of the motor shaft (140) when the motor unit (10) is placed on the placement surface (P1). [3] The motor unit (10) according to claim 1 or 2, wherein the first vibration-proof member (170) and the second vibration-proof member (176) are disposed above a lower end of the motor (86) when the motor unit (10) is placed on the placement surface (P1). [4] The motor unit (10) of any one of claims 1 to 3, wherein the first vibration-proof member (170) is a first distance from a vertical plane (P2) perpendicular to the placement surface (P1) and including the first direction, and the second vibration-proof member (176) is the first distance from the vertical plane (P2). [5] The motor unit (10) according to any one of claims 1 to 4, wherein a position of a center of gravity (G1) of the motor unit (10) in the first direction is substantially the same as each of a center position of the first vibration-proof member (170) in the first direction and a center position of the second vibration-proof member (176) in the first direction. [6] Motor unit (10) according to one of claims 1 to 5, further comprising: a third vibration-proof component (172) arranged between the body housing (12) and the motor housing (84); and a fourth vibration-proof component (178) arranged between the body housing (12) and the motor housing (84), at the at least a part of the third vibration-proof component (172) and at least a part of the fourth vibration-proof component (178) are arranged above the central axis (140a) of the motor shaft (140) when the motor unit (10) is placed on the placement surface (P1), and when the motor unit (10) is viewed along the first direction, the motor (86) is arranged between the third vibration-proof component (172) and the fourth vibration-proof component (178). [7] The motor unit (10) according to claim 6, wherein the third vibration-proof member (172) is arranged on a same side as the first vibration-proof member (170) relative to a vertical plane (P2) perpendicular to the placement surface (P1) and including the first direction, the fourth vibration-proof component (178) is arranged on the same side as the second vibration-proof component (176) relative to the vertical plane (P2), and a distance between the first vibration-proof component (170) and the third vibration-proof component (172) is substantially the same as a distance between the second vibration-proof component (176) and the fourth vibration-proof component (178). [8] The motor unit (10) according to any one of claims 1 to 7, further comprising a plate member (92) fixed to the motor housing (84), wherein the first vibration-proof member (170) and the second vibration-proof member (176) are fixed to the plate member (92) and the body housing (12). [9] Motor unit (10) according to one of claims 1 to 8, further comprising a second fixing part (150) adapted to be fixed to a working unit (4) of a different type from the working unit (4) fixed to the first fixing part (148). [10] Motor unit (10) according to one of claims 1 to 9, further comprising: a fan (88) fixed to the motor (86); a board housing (192) supporting the control circuit board (196); and a tubular vibration-proof component (104) arranged between the motor housing (84) and the plate housing (192) and having a tubular shape, wherein, when the fan (88) rotates, air cools the control circuit board (196) and passes within the tubular vibration-proof component (104). [11] Motor unit (10) according to one of claims 1 to 10, wherein the body housing (12) comprises: a first battery receptacle (22) adapted to have a first battery (BP1) adapted to supply power to the motor (86) removably attached thereto; and a second battery receptacle (24) configured to have a second battery (BP2) configured to power the motor (86) removably attached thereto. [12] Motor unit (10) according to one of claims 1 to 11, wherein, when the motor unit (10) is viewed along the first direction, the control circuit board (196) at least partially overlaps the motor (86). [13] Motor unit (10) adapted to be removably attached to a working unit (4) for driving the working unit (4), comprising: a motor (86) having a motor shaft (140) extending in a first direction and configured to drive the working unit (4); a control circuit board (196) configured to control the motor (86); a motor housing (84) supporting the motor (86); a body housing (12) disposed on an outer side of the control circuit board (196) and the motor housing (84); a second fixing part (150) adapted to be fixed to the working unit (4); a first vibration-proof component (170) arranged between the body housing (12) and the motor housing (84); and a second vibration-proof component (176) arranged between the body housing (12) and the motor housing (84), wherein the motor shaft (140) is substantially perpendicular to the second fixing part (150), in a top-bottom direction perpendicular to a placement surface (P1), at least a part of the first vibration-proof component (170) and at least a part of the second vibration-proof component (176) are arranged below an upper end of the motor (86) when the motor unit (10) is placed on the placement surface (P1), and when the motor unit (10) is viewed along the first direction, the motor (86) is arranged between the first vibration-proof component (170) and the second vibration-proof component (176). [14] The motor unit (10) according to claim 13, wherein the motor shaft (140) extends along the placement surface (P1) when the motor unit (10) is placed on the placement surface (P1), and the first vibration-proof member 170 and the second vibration-proof member (176) are arranged below a central axis (140a) of the motor shaft (140) when the motor unit (10) is placed on the placement surface (P1). [15] The motor unit (10) of claim 13 or 14, wherein the first vibration-proof member (170) is a first distance from a vertical plane (P2) perpendicular to the placement surface (P1) and including the first direction, and the second vibration-proof member (176) is the first distance from the vertical plane (P2). [16] Motor unit (10) according to one of claims 13 to 15, wherein the body housing (12) comprises: a first battery receptacle (22) adapted to have a first battery (BP1) adapted to supply power to the motor (86) removably attached thereto; and a second battery receptacle (24) configured to have a second battery (BP2) configured to power the motor (86) removably attached thereto. [17] Motor unit (10) adapted to be removably attached to a working unit (4) for driving the working unit (4), comprising: a motor (86) having a motor shaft (140) extending in a first direction and configured to drive the working unit (4); a control circuit board (196) configured to control the motor (86); a fan (88) fixed to the motor (86); a motor housing (84) supporting the motor (86); a board housing (192) supporting the control circuit board (196); a body housing (12) disposed on an outer side of the motor housing (84) and the plate housing (192); a fixing unit (90) designed to be fixed to the working unit (4); and a tubular vibration-proof component (104) arranged between the motor housing (84) and the plate housing (192) and having a tubular shape, wherein, when the fan (88) rotates, air cools the control circuit board (196) and passes within the tubular vibration-proof component (104). [18] Motor unit (10) according to claim 17, further comprising: a plate member (92) fixed to the motor housing (84); a support unit (100) supporting the disk housing (142); and a vibration-proof component (94) fixed to the plate component (92) and the support unit (100). [19] The motor unit (10) of claim 17 or 18, wherein, when the motor unit (10) is viewed along the first direction, the tubular vibration-proof member (104) at least partially overlaps the motor (86). [20] Motor unit (10) according to one of claims 17 to 19, wherein the body housing (12) comprises: a first battery receptacle (22) adapted to removably attach a first battery (BP1) adapted to supply power to the motor (86); and a second battery receptacle (24) adapted to removably attach a second battery (BP2) adapted to supply power to the motor (86).

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