Motor unit

Abstract

To provide a motor unit capable of sufficiently damping motor vibration.SOLUTION: A motor unit includes a motor extending in a first direction and having a motor shaft, a control circuit board for operating the motor, a motor housing supporting the motor, a main body housing disposed outside the control circuit board and the motor housing, a first fixing part that can be fixed to a work unit, and a first vibration-isolating member and a second vibration-isolating member that are disposed between the main body housing and the motor housing. The first fixing part can be placed on a mounting surface when the motor unit is placed on the mounting surface. At least a portion of the first vibration-isolating member and at least a portion of the second vibration-isolating member are placed below an upper end of the motor in the up-down direction perpendicular to the mounting surface when the motor unit is placed on the mounting surface. When the motor unit is viewed in the first direction, the motor is disposed between the first vibration-isolating member and the second vibration-isolating member.SELECTED DRAWING: Figure 22

Description

[Technical field]

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

[0002] Patent Document 1 discloses a motor unit. The motor unit is detachably attached to a working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft that operates the working unit, a control circuit board that operates the motor, a motor housing that supports the motor, a main body housing that is arranged outside the control circuit board and the motor housing, a first fixing part that can be fixed to the working unit, a first vibration-proof member that is arranged between the main body housing and the motor housing, a second vibration-proof member that is arranged between the main body housing and the motor housing, and a third vibration-proof member that is arranged between the main body housing and the motor housing. The first fixing part can be placed on the mounting surface when the motor unit is placed on the mounting surface, and is arranged approximately parallel to the motor shaft. [Prior art documents] [Patent documents]

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

[0004] In the above motor unit, the first vibration isolating member, the second vibration isolating member, and the third vibration isolating member are arranged asymmetrically with respect to the motor, so that vibrations of the motor cannot be sufficiently damped.

[0005] Furthermore, in the above motor unit, in order to cool the control circuit board, it is necessary to define the flow path space using members other than the first vibration isolating member, the second vibration isolating member, and the third vibration isolating member, etc. This increases the number of parts in the motor unit.

[0006] The present specification aims to provide at least one of a motor unit that can sufficiently dampen motor vibrations and a motor unit that can reduce the number of parts of the motor unit while damping motor vibrations. [Means for solving the problem]

[0007] This specification discloses a motor unit. The motor unit is detachably attached to a working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft for operating the working unit, a control circuit board for operating the motor, a motor housing supporting the motor, a main body housing arranged outside the control circuit board and the motor housing, a first fixing part that can be fixed to the working unit, a first vibration-proof member arranged between the main body housing and the motor housing, and a second vibration-proof member arranged between the main body housing and the motor housing. The first fixing part can be placed on the mounting surface when the motor unit is placed on the mounting surface, and is arranged approximately parallel to the motor shaft. At least a portion of the first vibration-proof member and at least a portion of the second vibration-proof member are arranged below the upper end of the motor in the up-down direction perpendicular to the mounting surface when the motor unit is placed on the mounting surface. When the motor unit is viewed in the first direction, the motor is arranged between the first vibration-proof member and the second vibration-proof member.

[0008] According to the above configuration, at least a portion of the first vibration-isolating member and at least a portion of the second vibration-isolating member are disposed below the upper end of the motor, and the first vibration-isolating member and the second vibration-isolating member are disposed on either side of the motor. Therefore, the first vibration-isolating member and the second vibration-isolating member are disposed symmetrically with respect to the motor. This makes it possible to sufficiently attenuate vibrations of the motor.

[0009] This specification also discloses a motor unit. The motor unit is detachably attached to the working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft for operating the working unit, a control circuit board for operating the motor, a motor housing for supporting the motor, a main body housing arranged outside the control circuit board and the motor housing, a second fixing part fixed to the working unit, a first vibration-proof member arranged between the main body housing and the motor housing, and a second vibration-proof member arranged between the main body housing and the motor housing. The motor shaft is approximately perpendicular to the second fixing part. At least a part of the first vibration-proof member and at least a part of the second vibration-proof member are arranged below the upper end of the motor in the up-down direction perpendicular to the mounting surface when the motor unit is placed on the mounting surface. When the motor unit is viewed in the first direction, the motor is arranged between the first vibration-proof member and the second vibration-proof member.

[0010] According to the above configuration, at least a portion of the first vibration-isolating member and at least a portion of the second vibration-isolating member are disposed below the upper end of the motor, and the first vibration-isolating member and the second vibration-isolating member are disposed on either side of the motor. Therefore, the first vibration-isolating member and the second vibration-isolating member are disposed symmetrically with respect to the motor. This makes it possible to sufficiently attenuate vibrations of the motor.

[0011] This specification also discloses a motor unit. The motor unit is detachably attached to the working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft that operates the working unit, a control circuit board that operates the motor, a fan fixed to the motor, a motor housing that supports the motor, a board housing that supports the control circuit board, a main body housing that is disposed outside the motor housing and the board housing, a fixing unit that is fixed to the working unit, and a cylindrical vibration-proof member that is disposed between the motor housing and the board housing and has a cylindrical shape. When the fan rotates, air cools the control circuit board and passes through the inside of the cylindrical vibration-proof member.

[0012] According to the above configuration, when the motor vibrates, the cylindrical vibration-damping member damps the vibration of the motor. Also, air that cools the control circuit board passes through the inside of the cylindrical vibration-damping member. By using the cylindrical vibration-damping member, it is possible to suppress the vibration of the motor and cool the control circuit board with a single part. This makes it possible to reduce the number of parts in the motor unit. [Brief description of the drawings]

[0013] [Figure 1] 1 illustrates a system 1 according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view of the motor unit 10 and the rammer 4a according to the first embodiment. [Diagram 3] FIG. 2 is a perspective view of the motor unit 10 and the plate compactor 4b according to the first embodiment. [Figure 4] FIG. 2 is a perspective view of a motor unit 10 and a battery pack BP according to the first embodiment. [Diagram 5] 4 is a table showing specifications of the motor unit 10, the main body housing 12, the motor 86, and the battery pack BP of the first embodiment. [Figure 6] FIG. 2 is a perspective view of a motor unit 10 and a battery pack BP according to the first embodiment. [Figure 7]1 is a perspective view of the vicinity of a first battery attachment portion 22 and a second battery attachment portion 24 in a motor unit 10 of a first embodiment. [Figure 8] 2 is a cross-sectional view of the vicinity of a first battery pack BP1 and a second battery pack BP2 in a motor unit 10 of the first embodiment. [Figure 9] 4 is a table showing the specifications of a motor 86 and a battery pack BP in the first embodiment. [Figure 10] FIG. 2 is a perspective view of a battery pack BP according to the first embodiment. [Figure 11] 2 is a cross-sectional view of the vicinity of a first battery attachment portion 22 and a first battery pack BP1 in the motor unit 10 of the first embodiment. FIG. [Figure 12] FIG. 2 is an exploded perspective view of the motor unit 10 of the first embodiment. [Figure 13] 1 is a cross-sectional view of a motor unit 10 and a battery pack BP according to a first embodiment. [Figure 14] FIG. 2 is a perspective view of a motor housing 84 and a motor 86 according to the first embodiment. [Figure 15] 2 is a cross-sectional view of the vicinity of an intake port 28a in the motor unit 10 of the first embodiment. [Figure 16] 2 is a cross-sectional view of a motor housing 84, a motor 86, and a fan 88 according to the first embodiment. [Figure 17] 2 is an exploded perspective view of a motor housing 84, a motor 86, and a plate member 92 according to the first embodiment. FIG. [Figure 18] FIG. 1 is an exploded perspective view of a motor unit 10 according to a first embodiment with a main body housing 12 and a support unit 100 removed. [Figure 19] FIG. 1 is an exploded perspective view of a motor unit 10 according to a first embodiment with a main body housing 12 and a support unit 100 removed. [Figure 20] FIG. 2 is a right side view of the motor unit 10 of the first embodiment with the main body housing 12 and the support unit 100 removed. [Figure 21]FIG. 2 is a left side view of the motor unit 10 of the first embodiment with the main body housing 12 and the support unit 100 removed. [Figure 22] 1 is a cross-sectional view of a motor unit 10 according to a first embodiment. [Diagram 23] FIG. 1 is a front view of a motor unit 10 according to a first embodiment with a main body housing 12 removed. [Figure 24] 1 is an exploded perspective view of a motor unit 10 according to a first embodiment with a main body housing 12 removed. FIG. [Diagram 25] 1 is an exploded perspective view of a motor unit 10 according to a first embodiment with a main body housing 12 removed. FIG. [Figure 26] 2 is a cross-sectional view of the vicinity of a control unit 102 in the motor unit 10 of the first embodiment. [Figure 27] FIG. 2 is a left side view of the motor unit 10 and the rammer 4a according to the first embodiment. [Figure 28] FIG. 2 is a front view of the motor housing 84, the motor 86, and the fixed unit 90 of the first embodiment. [Figure 29] 1 is a perspective view of the vicinity of a fixed base 308 of the rammer 4a of the first embodiment. FIG. [Diagram 30] FIG. 2 is an exploded perspective view of the motor unit 10 and the rammer 4a according to the first embodiment. [Diagram 31] FIG. 2 is a left side view of the motor unit 10 and the plate compactor 4b according to the first embodiment. [Diagram 32] FIG. 11 is an exploded perspective view of a first fixing portion 148 and a plate compactor 4b according to the first embodiment. [Diagram 33] FIG. 2 is a side view of the motor unit 10 and the slope grass mower 4c of the first embodiment. [Diagram 34] FIG. 11 is a perspective view of a motor unit 10 and a battery pack BP according to a second embodiment. [Diagram 35] FIG. 11 is a perspective view of a motor unit 10 and a battery pack BP according to a third embodiment. [Diagram 36]FIG. 11 is a right side view of the motor unit 10 according to the fourth embodiment with the main housing 12 and the support unit 100 removed. [Figure 37] FIG. 11 is a right side view of the motor unit 10 according to the fifth embodiment with the main body housing 12 and the support unit 100 removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Representative and non-limiting examples of the present invention will be described in detail below with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing the preferred examples of the present invention, and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed can be used separately or together with other features and inventions to provide further improved motor units, manufacturing methods and methods of using the same.

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

[0016] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the specific features described in the original disclosure and claims, apart from the configuration of features described in the examples and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the specific features described in the original disclosure and claims.

[0017] This specification discloses a motor unit. The motor unit is detachably attached to a working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft for operating the working unit, a control circuit board for operating the motor, a motor housing supporting the motor, a main body housing arranged outside the control circuit board and the motor housing, a first fixing part that can be fixed to the working unit, a first vibration-proof member arranged between the main body housing and the motor housing, and a second vibration-proof member arranged between the main body housing and the motor housing. The first fixing part can be placed on the mounting surface when the motor unit is placed on the mounting surface, and is arranged approximately parallel to the motor shaft. At least a portion of the first vibration-proof member and at least a portion of the second vibration-proof member are arranged below the upper end of the motor in the up-down direction perpendicular to the mounting surface when the motor unit is placed on the mounting surface. When the motor unit is viewed in the first direction, the motor is arranged between the first vibration-proof member and the second vibration-proof member.

[0018] In one or more embodiments, the motor shaft may extend along the mounting surface when the motor unit is placed on the mounting surface, and the first vibration isolating member and the second vibration isolating member may be disposed below a central axis of the motor shaft when the motor unit is placed on the mounting surface.

[0019] Generally, the components of a motor unit are often arranged in the space above the upper end of the motor. With the above-described configuration, it is possible to utilize the empty space below the central axis of the motor shaft.

[0020] In one or more embodiments, the first vibration isolating member and the second vibration isolating member may be disposed above a lower end of the motor when the motor unit is placed on a mounting surface.

[0021] According to the above configuration, it is possible to utilize the space between the center axis of the motor shaft and the lower end of the motor.

[0022] In one or more embodiments, the first vibration isolating member may be a first distance away from an orthogonal plane that is perpendicular to the mounting surface and includes the first direction, and the second vibration isolating member may be a first distance away from the orthogonal plane.

[0023] According to the above configuration, the distance between the first vibration isolating member and the orthogonal plane is the same as the distance between the second vibration isolating member and the orthogonal plane. Therefore, the first vibration isolating member and the second vibration isolating member are disposed symmetrically with respect to the orthogonal plane. This makes it possible to further attenuate vibrations of the motor.

[0024] In one or more embodiments, the position of the center of gravity of the motor unit in the first direction may be approximately the same as the central position of the first vibration-proof member in the first direction and the central position of the second vibration-proof member in the first direction.

[0025] According to the above configuration, vibrations of the motor can be further damped.

[0026] In one or more embodiments, the motor unit may further include a third vibration-isolating member disposed between the main body housing and the motor housing, and a fourth vibration-isolating member disposed between the main body housing and the motor housing. At least a portion of the third vibration-isolating member and at least a portion of the fourth vibration-isolating member may be disposed above a central axis of the motor shaft when the motor unit is placed on a mounting surface. When the motor unit is viewed in the first direction, the motor may be disposed between the third vibration-isolating member and the fourth vibration-isolating member.

[0027] According to the above configuration, vibrations of the motor can be attenuated more effectively than in a configuration in which the motor unit includes only the first vibration-isolating member and the second vibration-isolating member.

[0028] In one or more embodiments, the third vibration isolating member may be disposed on the same side as the first vibration isolating member with respect to an orthogonal plane that is orthogonal to the mounting surface and includes the first direction. The fourth vibration isolating member may be disposed on the same side as the second vibration isolating member with respect to the orthogonal plane. The distance between the first vibration isolating member and the third vibration isolating member may be substantially the same as the distance between the second vibration isolating member and the fourth vibration isolating member.

[0029] According to the above configuration, the third vibration isolation member and the fourth vibration isolation member are disposed symmetrically with respect to the perpendicular plane, which makes it possible to further attenuate vibration of the motor.

[0030] In one or more embodiments, the motor unit may further include a plate member fixed to the motor housing. The first and second vibration isolating members may be fixed to the plate member and the main housing.

[0031] In a configuration in which the first and second vibration isolating members are directly fixed to the motor housing, the configuration of the motor housing becomes complicated. With the above configuration, it is possible to prevent the configuration of the motor housing from becoming complicated.

[0032] In one or more embodiments, the motor unit may further include a second fixed part that is fixed to a working unit of a different type than the working unit fixed to the first fixed part.

[0033] According to the above configuration, the number of types of working units that can use the motor unit can be increased.

[0034] In one or more embodiments, the motor unit may further include a fan fixed to the motor, a board housing supporting a control circuit board, and a cylindrical vibration-isolating member disposed between the motor housing and the board housing and having a cylindrical shape. When the fan rotates, air may cool the control circuit board and pass through the inside of the cylindrical vibration-isolating member.

[0035] According to the above configuration, when the motor vibrates, the cylindrical vibration-damping member damps the vibration of the motor. Also, air that cools the control circuit board passes through the inside of the cylindrical vibration-damping member. By using the cylindrical vibration-damping member, it is possible to suppress the vibration of the motor and cool the control circuit board with a single part.

[0036] In one or more embodiments, the main body housing may include a first battery mounting portion to which a first battery that supplies power to the motor is removably attached, and a second battery mounting portion to which a second battery that supplies power to the motor is removably attached.

[0037] According to the above configuration, the output of the motor unit can be increased, or the operating time of the motor unit can be extended.

[0038] In one or more embodiments, when the motor unit is viewed in a first direction, the control circuit board may at least partially overlap the motor.

[0039] According to the above configuration, when the motor unit is viewed in a first direction, the motor unit is prevented from becoming larger in a direction perpendicular to the first direction, compared to a configuration in which the control circuit board does not at least partially overlap the motor.

[0040] This specification discloses a motor unit. The motor unit is detachably attached to the working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft for operating the working unit, a control circuit board for operating the motor, a motor housing for supporting the motor, a main body housing arranged outside the control circuit board and the motor housing, a second fixing part fixed to the working unit, a first vibration-proof member arranged between the main body housing and the motor housing, and a second vibration-proof member arranged between the main body housing and the motor housing. The motor shaft is approximately perpendicular to the second fixing part. At least a part of the first vibration-proof member and at least a part of the second vibration-proof member are arranged below the upper end of the motor in the up-down direction perpendicular to the mounting surface when the motor unit is placed on the mounting surface. When the motor unit is viewed in the first direction, the motor is arranged between the first vibration-proof member and the second vibration-proof member.

[0041] In one or more embodiments, the motor shaft may extend along the mounting surface when the motor unit is placed on the mounting surface, and the first vibration isolating member and the second vibration isolating member may be disposed below a central axis of the motor shaft when the motor unit is placed on the mounting surface.

[0042] Generally, the components of a motor unit are often arranged in the space above the upper end of the motor. With the above-described configuration, it is possible to utilize the empty space below the central axis of the motor shaft.

[0043] In one or more embodiments, the first vibration isolating member may be a first distance away from an orthogonal plane that is perpendicular to the mounting surface and includes the first direction, and the second vibration isolating member may be a first distance away from the orthogonal plane.

[0044] According to the above configuration, the distance between the first vibration isolating member and the orthogonal plane is the same as the distance between the second vibration isolating member and the orthogonal plane. Therefore, the first vibration isolating member and the second vibration isolating member are disposed symmetrically with respect to the orthogonal plane. This makes it possible to further attenuate vibrations of the motor.

[0045] In one or more embodiments, the main body housing may include a first battery mounting portion to which a first battery that supplies power to the motor is removably attached, and a second battery mounting portion to which a second battery that supplies power to the motor is removably attached.

[0046] According to the above configuration, the output of the motor unit can be increased, or the operating time of the motor unit can be extended.

[0047] This specification discloses a motor unit. The motor unit is detachably attached to a working unit and operates the working unit. The motor unit includes a motor extending in a first direction and having a motor shaft that operates the working unit, a control circuit board that operates the motor, a fan fixed to the motor, a motor housing that supports the motor, a board housing that supports the control circuit board, a main body housing that is disposed outside the motor housing and the board housing, a fixing unit that is fixed to the working unit, and a cylindrical vibration-proof member that is disposed between the motor housing and the board housing and has a cylindrical shape. When the fan rotates, air cools the control circuit board and passes through the inside of the cylindrical vibration-proof member.

[0048] In one or more embodiments, the motor unit may further include a plate member fixed to the motor housing, a support unit supporting the base housing, and a vibration isolation member fixed to the plate member and the support unit.

[0049] According to the above-mentioned configuration, the vibration of the motor is damped by the cylindrical vibration-isolating member and the vibration-isolating member, thereby making it possible to suppress the vibration from being transmitted to the control circuit board.

[0050] In one or more embodiments, when the motor unit is viewed in a first direction, the tubular vibration isolation member may at least partially overlap the motor.

[0051] According to the above configuration, when the motor unit is viewed in the first direction, the motor unit can be prevented from becoming larger in a direction perpendicular to the first direction, compared to a configuration in which the tubular vibration-damping member does not at least partially overlap with the motor.

[0052] In one or more embodiments, the main body housing may include a first battery mounting portion to which a first battery that supplies power to the motor is removably attached, and a second battery mounting portion to which a second battery that supplies power to the motor is removably attached.

[0053] According to the above configuration, the output of the motor unit can be increased, or the operating time of the motor unit can be extended.

[0054] (First Example) As shown in FIG. 1, the system 1 includes a plurality of types of working units 4 and a motor unit 10. The motor unit 10 is a general-purpose motor unit. The motor unit 10 is detachably attached to each of the plurality of types of working units 4. Instead of the motor unit 10, an engine unit can be detachably attached to the working unit 4. The engine unit is a compatible engine unit, for example, the engine unit of GX120 sold by Honda R&D Co., Ltd. That is, the working unit 4 is applicable to both the motor unit 10 and the engine unit. The plurality of types of working units 4 include, for example, a rammer 4a, a plate compactor 4b, a slope grass mower 4c, a trowel 4d, a concrete saw 4e, a reel-type lawn mower 4f, an edger 4g, a detacher 4h, a stump grinder 4i, a compressor 4j, a high-pressure washer 4k, a paint sprayer 4l, a trash pump 4m, and a chemical sprayer 4n. Furthermore, the working unit 4 is not limited to the above working unit 4, and may be a working unit 4 other than the above working unit 4. For example, as shown in FIG. 2, the motor unit 10 is detachably attached to the rammer 4a. Also, as shown in FIG. 3, the motor unit 10 is detachably attached to the plate compactor 4b. Hereinafter, the configuration in which the motor unit 10 is attached to the working unit 4 may be referred to as the working machine 2. A user uses the working machine 2 to perform work.

[0055] As shown in FIG. 4, the motor unit 10 operates with the power of a plurality of (two in this embodiment) battery packs BP. Hereinafter, one of the battery packs BP may be referred to as a first battery pack BP1, and the other battery pack BP may be referred to as a second battery pack BP2. The direction in which the motor shaft 140 of the motor 86 (see FIG. 16), which will be described later, extends is referred to as the front-rear direction, the direction perpendicular to the front-rear direction is referred to as the left-right direction, and the direction perpendicular to the front-rear direction and the left-right direction is referred to as the up-down direction. The front-rear direction, the left-right direction, and the up-down direction are defined to explain the detailed configuration of the motor unit 10. In the working machine 2 in which the motor unit 10 and the working unit 4 are combined, the front-rear direction, the left-right direction, and the up-down direction of the working machine 2 may differ from the front-rear direction, the left-right direction, and the up-down direction of the motor unit 10.

[0056] As shown in FIG. 5, in a motor unit 10 including a plurality of battery packs BP, the weight of the motor unit 10 is 11.7 kg or more and 19 kg or less. The length in the front-rear direction of the motor unit 10 is 230 mm or more and 235 mm or less. Note that the length in the front-rear direction does not include the length of the motor shaft 140 exposed to the outside of the motor unit 10. The length in the left-right direction of the motor unit 10 is 170 mm or more and 230 mm or less. The length in the up-down direction of the motor unit 10 is 280 mm or more and 350 mm or less. The volume of the motor unit 10 is 9500 cm 3 Above 13,000 cm 3 The following is the result.

[0057] In a motor unit 10 that does not include multiple battery packs BP, the weight of the motor unit 10 is 10.5 kg or more and 15 kg or less. The length in the front-rear direction of the motor unit 10 is 230 mm or more and 235 mm or less. Note that the length in the front-rear direction does not include the length of the motor shaft 140 exposed to the outside of the motor unit 10. The length in the left-right direction of the motor unit 10 is 170 mm or more and 230 mm or less. The length in the up-down direction of the motor unit 10 is 240 mm or more and 260 mm or less. The volume of the motor unit 10 is 8500 cm 3 More than 10000cm3 The following is the result.

[0058] As shown in Figs. 4 and 6, the motor unit 10 includes a main body housing 12. The main body housing 12 is made of, for example, a resin material. As shown in Fig. 5, the weight of the main body housing 12 is 0.9 kg or more and 1.2 kg or less. The length of the main body housing 12 in the front-rear direction is 220 mm or more and 225 mm or less. The length of the main body housing 12 in the left-right direction is 170 mm or more and 230 mm or less. The length of the main body housing 12 in the up-down direction is 220 mm or more and 240 mm or less. The volume of the main body housing 12 is 8000 cm 3 Above 9500cm 3 The following is the result.

[0059] As shown in Figs. 4 and 6, the main body housing 12 includes a right main body housing 14 and a left main body housing 16. The right main body housing 14 defines the outer shape of the right half of the main body housing 12. The left main body housing 16 defines the outer shape of the left half of the main body housing 12. The right main body housing 14 and the left main body housing 16 are fixed with screws 17 (see Fig. 12). Each of the right main body housing 14 and the left main body housing 16 has a shape obtained by dividing the main body housing 12 in half on a plane including the front-rear direction and the up-down direction. The boundary between the right main body housing 14 and the left main body housing 16 is located at the center of the main body housing 12 in the left-right direction. An accommodation space 18 (see Fig. 13) is defined between the right main body housing 14 and the left main body housing 16.

[0060] The main body housing 12 includes a storage section 20, a first battery attachment section 22, and a second battery attachment section 24. The storage section 20 has an interior storage space 18 (see FIG. 13). The storage section 20 has a first opening 26 and a second opening 28. The first opening 26 is disposed in a front wall 20a of the storage section 20. The first opening 26 has a substantially circular cross-sectional shape. The first opening 26 communicates the storage space 18 with the outside of the main body housing 12. As shown in FIG. 6, the second opening 28 is disposed in a bottom wall 20b of the storage section 20. The second opening 28 has a substantially rectangular cross-sectional shape. The second opening 28 communicates the storage space 18 with the outside of the main body housing 12.

[0061] As shown in Fig. 7, the upper wall 20c of the storage section 20 includes a base 32, a first truncated pyramid section 34, and a second truncated pyramid section 36. The first truncated pyramid section 34 protrudes upward from the base 32. The first truncated pyramid section 34 has a quadrangular pyramid shape. An upper surface 34a of the first truncated pyramid section 34 is disposed above an upper surface 32a of the base 32. The upper surfaces 32a and 34a are each perpendicular to the up-down direction.

[0062] The second truncated pyramid portion protrudes upward from the base portion 32. The second truncated pyramid portion is connected to the rear end of the first truncated pyramid portion .

[0063] The first battery mounting portion 22 and the second battery mounting portion 24 are disposed on the upper surface 34a of the first truncated pyramid portion 34. The first battery mounting portion 22 and the second battery mounting portion 24 are disposed side by side in the left-right direction. When the motor unit 10 is viewed in the up-down direction, the first battery mounting portion 22 does not overlap with the second battery mounting portion 24.

[0064] The first battery mounting section 22 includes a first right rail section 40, a first left rail section 42, and a first connection section 44. The first right rail section 40 and the first left rail section 42 extend in the front-rear direction. The first right rail section 40 extends upward from the upper surface 34a of the first truncated pyramid section 34, then bends and extends to the left. The first left rail section 42 extends upward from the upper surface 34a of the first truncated pyramid section 34, then bends and extends to the right. The first left rail section 42 faces the first right rail section 40 in the left-right direction. The first connection section 44 connects the front end of the first right rail section 40 to the front end of the first left rail section 42.

[0065] The second battery mounting section 24 includes a second right rail section 48, a second left rail section 50, and a second connection section 52. The second right rail section 48 and the second left rail section 50 extend in the front-rear direction. The second right rail section 48 extends upward from the upper surface 34a of the first truncated pyramid section 34, then bends and extends leftward. The second left rail section 50 is integrally formed with the first right rail section 40. The second left rail section 50 extends upward from the upper surface 34a of the first truncated pyramid section 34, then bends and extends rightward. The second left rail section 50 faces the second right rail section 48 in the left-right direction. The second connection section 52 connects the front end of the second right rail section 48 to the front end of the second left rail section 50.

[0066] 8, a first battery pack BP1 is attached to the first battery attachment portion 22. A second battery pack BP2 is attached to the second battery attachment portion 24. In this embodiment, the configuration of the first battery pack BP1 is the same as the configuration of the second battery pack BP2. Therefore, the following description will be given taking the first battery pack BP1 as an example.

[0067] The first battery pack BP1 includes a chargeable and dischargeable secondary battery, for example, a lithium-ion battery. As shown in FIG. 5, the weight of the first battery pack BP1 is 0.6 kg or more and 2 kg or less. The length of the first battery pack BP1 in the front-rear direction is 115 mm or more and 155 mm or less. The length of the first battery pack BP1 in the left-right direction is 75 mm or more and 85 mm or less. The length of the first battery pack BP1 in the up-down direction is 65 mm or more and 115 mm or less. The volume of the first battery pack BP1 is 500 cm 3 Above 1500cm 3 9, the maximum voltage value of the first battery pack BP1 is 40 V or more and 80 V or less. The rated capacity of the first battery pack BP1 is 4 Ah or more and 40 Ah or less. In a modified example, the configuration of the first battery pack BP1 (i.e., dimensions, maximum voltage value, and rated capacity) may be different from the configuration of the second battery pack BP2 (i.e., dimensions, maximum voltage value, and rated capacity).

[0068] 10, the first battery pack BP1 includes a battery housing 56, a hook 58, a right battery rail 60, and a left battery rail 62. The battery housing 56 accommodates therein cells of a chargeable and dischargeable secondary battery, for example, a lithium ion battery cell.

[0069] The hook 58 is movably attached to the lower surface 56a of the battery housing 56. The hook 58 includes an engagement portion 64 and an operation portion 66. The engagement portion 64 is, for example, an engagement claw. The engagement portion 64 normally protrudes to the outside of the battery housing 56. When the operation portion 66 is pushed into the battery housing 56, the entire engagement portion 64 moves into the inside of the battery housing 56.

[0070] The right battery rail 60 and the left battery rail 62 protrude from the lower surface 56a of the battery housing 56. The right battery rail 60 and the left battery rail 62 extend in the front-rear direction. The right battery rail 60 is aligned with the left battery rail 62 in the left-right direction. In the left-right direction, the engagement portion 64 is disposed between the right battery rail 60 and the left battery rail 62. The right battery rail 60 extends downward from the lower surface 56a of the battery housing 56, then bends and extends to the right. The left battery rail 62 extends downward from the lower surface 56a of the battery housing 56, then bends and extends to the left.

[0071] As shown in FIG. 11, when the first battery pack BP1 is slid in the mounting direction D1, the first battery pack BP1 is guided by the first right rail portion 40 (see FIG. 7) and the first left rail portion 42 (see FIG. 7) and slides on the upper surface 34a of the first truncated pyramid portion 34. The mounting direction D1 is the forward direction. At this time, the right battery rail 60 (see FIG. 10) is slidably engaged with the first right rail portion 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 abuts against the upper surface 34a, the engaging portion 64 is pushed into the inside of the battery housing 56 by the upper surface 34a. The upper surface 34a is formed with a recessed groove 34b recessed from the upper surface 34a. When the engagement portion 64 reaches the recessed groove 34b, it protrudes from the inside of the battery housing 56 to the outside and engages with the upper surface 34a in the recessed groove 34b. This causes the first battery pack BP1 to be attached to the first battery mounting portion 22. When the operation portion 66 is pushed in, the engagement portion 64 comes out of the recessed groove 34b, so that when the first battery pack BP1 is slid in the removal direction D2, the first battery pack BP1 is removed from the first battery mounting portion 22. The removal direction D2 is opposite to the mounting direction D1 and is the rear direction. Although not shown in the figure, the mounting direction in which the second battery pack BP2 is attached to the second battery mounting portion 24 is the same as the mounting direction D1. Also, the removal direction in which the second battery pack BP2 is removed from the second battery mounting portion 24 is the same as the removal direction D2.

[0072] As shown in FIG. 8, when the first battery pack BP1 is attached to the first battery mounting portion 22 and the second battery pack BP2 is attached to the second battery mounting portion 24, the lower surface 56a of the battery housing 56 of the first battery pack BP1 abuts against the first battery mounting portion 22 from above, and the lower surface 56a of the battery housing 56 of the second battery pack BP2 abuts against the second battery mounting portion 24 from above. The left surface 56b of the battery housing 56 of the first battery pack BP1 faces the right surface 56c of the battery housing 56 of the second battery pack BP2 in the left-right direction. The left surface 56b of the battery housing 56 of the first battery pack BP1 is approximately parallel to the right surface 56c of the battery housing 56 of the second battery pack BP2. No wall portion including the storage portion 20 is disposed between the left surface 56b of the battery housing 56 of the first battery pack BP1 and the right surface 56c of the battery housing 56 of the second battery pack BP2. The distance between the left side 56b of the battery housing 56 of the first battery pack BP1 and the right side 56c of the battery housing 56 of the second battery pack BP2 is 175 mm or less. In a modified example, the distance between the left side 56b of the battery housing 56 of the first battery pack BP1 and the right side 56c of the battery housing 56 of the second battery pack BP2 may be 350 mm or less.

[0073] As shown in Fig. 7, the motor unit 10 includes a first battery terminal 70, a second battery terminal 72, a main power switch 74, a display panel 76, an operation switch 78a, and a rotation speed change switch 78b. The first battery terminal 70 and the second battery terminal 72 are disposed on the upper surface 34a of the first truncated pyramid portion 34. The first battery terminal 70 is surrounded by the first battery mounting portion 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 mounted on the first battery mounting portion 22.

[0074] The second battery terminal 72 is surrounded by the second battery mounting portion 24. The second battery terminal 72 includes a plurality of second terminal members 80. When the second battery pack BP2 is attached to the second battery mounting portion 24, the second terminal members 80 are electrically connected to terminal members (not shown) of the second battery pack BP2. In this embodiment, when the first battery pack BP1 is attached to the first battery mounting portion 22 and the second battery pack BP2 is attached to the second battery mounting portion 24, the first battery pack BP1 and the second battery pack BP2 are electrically connected in series. In a modified example, the second terminal members 80 may be electrically connected in parallel to the first terminal members 79.

[0075] The main power switch 74 and the display panel 76 are disposed in the second frustum portion 36. The main power switch 74 switches the motor unit 10 between an on state and an off state. The display panel 76 lights up when the motor unit 10 is in the on state.

[0076] The operation switch 78a is disposed behind the main power switch 74 and the display panel 76. The operation switch 78a is a rocker switch. When the right portion of the operation switch 78a is pressed into the main body housing 12, the left portion of the operation switch 78a pops out from the main body housing 12, and when the left portion of the operation switch 78a is pressed into the main body housing 12, the right portion of the operation switch 78a pops out from the main body housing 12. When the motor unit 10 is in the on state, if the left portion of the operation switch 78a is pressed into the main body housing 12, the motor unit 10 operates. When the right portion of the operation switch 78a is pressed into the main body housing 12 while the motor unit 10 is operating, the motor unit 10 stops.

[0077] The rotation speed change switch 78b is disposed in the second frustum of pyramid section 36. The rotation speed change switch 78b is disposed to the left of the display panel 76. The rotation speed change switch 78b changes the rotation speed of a motor 86, which will be described later.

[0078] As shown in Figure 12, the motor unit 10 includes a motor housing 84, a motor 86 (see Figure 16), a fan 88 (see Figure 16), a fixed unit 90, a plate member 92, a vibration-damping portion 94 (see Figures 18 and 19), a right cover member 96, a left cover member 98, a support unit 100, a control unit 102 (see Figure 25), and a cylindrical vibration-damping member 104 (see Figure 25).

[0079] 13, the motor housing 84 is surrounded by the accommodation portion 20. The accommodation portion 20 is disposed outside the motor housing 84. The motor housing 84 accommodates a motor 86 and a fan 88 therein. The motor housing 84 includes a motor housing main body 108, a front bracket 110, and a rear bracket 112.

[0080] The motor housing body 108 includes a tube portion 114, a partition wall portion 116, a screw boss portion 118 (see FIG. 14), and a leg portion 120. The tube portion 114 has a cylindrical shape. The partition wall portion 116 extends radially inward from the inner surface of the tube portion 114 toward the center of the tube portion 114. As shown in FIG. 14, the screw boss portion 118 protrudes upward from an upper portion of the tube portion 114. The leg portion 120 protrudes downward from a lower portion of the tube portion 114. As shown in FIG. 13, the leg portion 120 passes through the second opening 28.

[0081] The front bracket 110 is fixed to the front end of the motor housing main body 108 by a screw 121 (see FIG. 14). The front bracket 110, the tube portion 114, and the front surface of the partition wall portion 116 define a motor accommodating space 122. The front bracket 110 penetrates the first opening 26 of the main housing 12. The front bracket 110 is spaced apart from the outer edge of the first opening 26. The front bracket 110 and the outer edge of the first opening 26 define an intake port 26a. The intake port 26a is a part of the first opening 26. The intake port 26a communicates between the accommodation space 18 of the main housing 12 and the outside of the main housing 12. As shown in FIG. 15, the front bracket 110 has an exhaust port 124. The exhaust port 124 penetrates the front bracket 110 in the front-rear direction. The exhaust port 124 communicates between the motor accommodating space 122 and the outside of the motor housing 84.

[0082] As shown in Figure 16, the rear bracket 112 is fixed to the rear end of the motor housing main body 108 with screws 125 (see Figure 14). A fan accommodating space 126 is defined by the rear bracket 112, the tube portion 114, and the rear surface of the partition portion 116. The rear bracket 112 has a motor intake port 128. The rear bracket 112 passes through the motor intake port 128 in the front-rear direction. The motor intake port 128 communicates between the fan accommodating space 126 and the outside of the motor housing 84.

[0083] The motor 86 is disposed in the motor accommodating space 122. The motor 86 is, for example, a DC motor. In a modified example, the motor 86 may be an AC motor. The motor 86 is an outer rotor type brushless motor. In a modified example, the motor 86 may be an inner rotor type brushless motor or a brushed motor. The motor 86 operates when the left portion of the operation switch 78a (see FIG. 7) is pressed into the main body housing 12 while the motor unit 10 is in the on state. The motor 86 operates with power supplied from the battery pack BP.

[0084] As shown in FIG. 5, the weight of the motor 86 is 2 kg or more and 3 kg or less. The length of the motor 86 in the front-rear direction is 140 mm or more and 145 mm or less. The volume of the motor 86 is 650 cm 3 Above 750cm 3 The diameter of the motor 86 is 80 mm or more and 145 mm or less. As shown in FIG. 9, the maximum output value of the motor 86 is 1.5 kW or more and 4 kW or less. In a modified example, the maximum output value of the motor 86 may be 1.5 kW or more and 3 kW or less, or 1.5 kW or more and 2.35 kW or less. The maximum current value of the motor 86 is 15 A or more and 70 A or less. The torque of the motor 86 is 2 N·m or more and 11 N·m or less. In a modified example, the torque of the motor 86 may be 3 N·m or more and 8 N·m or less. The rotation speed of the motor 86 is 3000 rpm or more and 4300 rpm or less.

[0085] As shown in Fig. 16, the motor 86 includes a stator body 132, a coil 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 disposed so as to surround the outer circumferential surface of the stator body 132. The diameter of the outer rotor body 136 is substantially the same as the diameter of the motor 86. Each permanent magnet 138 is fixed to the outer rotor body 136.

[0086] The motor shaft 140 is fixed to the outer rotor body 136. When the motor unit 10 is placed on the mounting surface P1, the motor shaft 140 extends along the mounting 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 by the front bracket 110 via a bearing 144. The motor shaft 140 rotates around a central axis 140a.

[0087] The fan 88 is fixed to the rear end of the motor shaft 140. The fan 88 is disposed in the fan accommodating space 126. In this embodiment, the fan 88 is a centrifugal fan. In a modified example, the fan 88 may be an axial fan. The fan 88 rotates integrally with the motor shaft 140.

[0088] The fixing unit 90 includes a first fixing portion 148 and a second fixing portion 150. The first fixing portion 148 is fixed to the lower end of the leg portion 120 by a screw 152. The first fixing portion 148 includes a first fixing surface 148a. The first fixing surface 148a corresponds to the lower surface of the first fixing portion 148. The first fixing surface 148a is approximately 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).

[0089] 13, the first fixing portion 148 is disposed below the motor 86. The motor 86 is disposed between the first fixing portion 148 and the first battery attachment portion 22. The motor 86 is also disposed between the first fixing portion 148 and the second battery attachment portion 24 (see FIG. 12).

[0090] As shown 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 the front surface of the second fixing part 150. When the motor unit 10 is placed on the mounting surface P1, the second fixing surface 150a is perpendicular to the mounting surface P1. The second fixing surface 150a is approximately perpendicular to the first fixing surface 148a. The second fixing surface 150a is approximately perpendicular to the motor shaft 140. The second fixing surface 150a is fixed to the working unit 4 (see FIG. 2). The type of working unit 4 fixed to the second fixing surface 150a is different from the type of working unit 4 fixed to the first fixing surface 148a.

[0091] 17, the plate member 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 a screw 155. The plate body 154 faces the upper, right, and left portions of the tube portion 114.

[0092] 18 and 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. The shapes of the second right sleeve 158, the third right sleeve 160, the first left sleeve 162, the second left sleeve 164, and the third left sleeve 166 are the same as the shape of the first right sleeve 156.

[0093] 18, the first right sleeve 156, the second right sleeve 158, and the third right sleeve 160 protrude rightward from the right wall 154a of the plate body 154. The first right sleeve 156 is disposed at the lower part of the right wall 154a. The second right sleeve 158 is disposed at the front upper part of the right wall 154a. The third right sleeve 160 is disposed at the rear upper part of the right wall 154a.

[0094] As shown in FIG. 20 , the first right sleeve 156 is disposed below the central axis 140a of the motor shaft 140. The second right sleeve 158 and the third right sleeve 160 are disposed above the central axis 140a of the motor shaft 140. The position of the second right sleeve 158 in the up-down direction is substantially the same as the position of the third right sleeve 160 in the up-down direction. In the front-rear direction, the first right sleeve 156 is disposed in the center between the second right sleeve 158 and the third right sleeve 160. The distance between the first right sleeve 156 and the second right sleeve 158 is substantially the same as the distance between the second right sleeve 158 and the third right sleeve 160 and the distance between the third right sleeve 160 and the first right sleeve 156.

[0095] As shown in FIG. 19, the first left sleeve 162, the second left sleeve 164, and the third left sleeve 166 protrude leftward from the left wall 154b of the plate body 154. The vertical and front-rear positions of the first left sleeve 162 are substantially the same as those of the first right sleeve 156. The vertical and front-rear positions of the second left sleeve 164 are substantially the same as those of the second right sleeve 158. The vertical and front-rear positions of the third left sleeve 166 are substantially the same as those of the third right sleeve 160. As shown in FIG. 21, the distance between the first left sleeve 162 and the second left sleeve 164 is substantially the same as the distance between the second left sleeve 164 and the third left sleeve 166 and the distance between the third left sleeve 166 and the first left sleeve 162. Moreover, the distance between the first left sleeve 162 and the second left sleeve 164 is approximately the same as the distance between the first right sleeve 156 (see FIG. 20) and the second right sleeve 158 (see FIG. 20).

[0096] As shown in FIG. 18 and FIG. 19, the vibration-isolating section 94 includes a first right vibration-isolating member 170, a second right vibration-isolating member 172, a third right vibration-isolating member 174, a first left vibration-isolating member 176, a second left vibration-isolating member 178, and a third left vibration-isolating member 180. The first right vibration-isolating member 170 has a cylindrical shape. The first right vibration-isolating member 170 is made of an elastic material. The first right vibration-isolating member 170 is made of, for example, a foam, a rubber material, a thermoplastic elastomer material, or a thermosetting elastomer material. The shapes of the second right vibration-isolating member 172, the third right vibration-isolating member 174, the first left vibration-isolating member 176, the second left vibration-isolating member 178, and the third left vibration-isolating member 180 are the same as the shapes of the first right vibration-isolating member 170. The material of the second right vibration-isolating member 172, the material of the third right vibration-isolating member 174, the material of the first left vibration-isolating member 176, the material of the second left vibration-isolating member 178, and the material of the third left vibration-isolating member 180 are the same as the material of the first right vibration-isolating member 170.

[0097] As shown in FIG. 18, the first right sleeve 156 is inserted into the opening 170a of the first right vibration isolating member 170. The second right sleeve 158 is inserted into the opening 172a of the second right vibration isolating member 172. The third right sleeve 160 is inserted into the opening 174a of the third right vibration isolating member 174. When the first right vibration isolating member 170 abuts against the right wall 154a of the plate body 154, it protrudes to the right of the first right sleeve 156. When the second right vibration isolating member 172 abuts against the right wall 154a of the plate body 154, it protrudes to the right of the second right sleeve 158. When the third right vibration isolating member 174 abuts against the right wall 154a of the plate body 154, it protrudes to the right of the third right sleeve 160. As shown in FIG. 20, the first right vibration isolating member 170 is disposed below the 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 pack BP is not attached. The second right vibration isolating member 172 and the third right vibration isolating member 174 are disposed above the center of gravity G1 of the motor unit 10. The distance between the first right vibration isolating member 170 and the second right vibration isolating member 172 is approximately the same as the distance between the second right vibration isolating member 172 and the third right vibration isolating member 174, and the distance between the third right vibration isolating member 174 and the first right vibration isolating member 170. In the front-rear direction, the center position of the first right vibration isolating member 170 is approximately the same as the position of the center of gravity G1 of the motor unit 10.

[0098] As shown in FIG. 19, the first left sleeve 162 is inserted into the opening 176a of the first left vibration isolating member 176. The first left vibration isolating member 176 is disposed below the center of gravity G1 of the motor unit 10. The second left sleeve 164 is inserted into the opening 178a of the second left vibration isolating member 178. The third left sleeve 166 is inserted into the opening 180a of the third left vibration isolating member 180. The second left vibration isolating member 178 and the third left vibration isolating member 180 are disposed above the center of gravity G1 of the motor unit 10. When the first left vibration isolating member 176 abuts against the left wall 154b of the plate body 154, it protrudes leftward from the first left sleeve 162. When the second left vibration isolating member 178 abuts against the left wall 154b of the plate body 154, it protrudes leftward from the second left sleeve 164. When the third left vibration isolating member 180 abuts against the left wall 154b of the plate body 154, it protrudes further left than the third left sleeve 166. As shown in FIG. 21, the distance between the first left vibration isolating member 176 and the second left vibration isolating member 178 is approximately the same as the distance between the second left vibration isolating member 178 and the third left vibration isolating member 180, and the distance between the third left vibration isolating member 180 and the first left vibration isolating member 176. The distance between the first left vibration isolating member 176 and the second left vibration isolating member 178 is approximately the same as the distance between the first right vibration isolating member 170 (see FIG. 20) and the second right vibration isolating member 172 (see FIG. 20). In the front-rear direction, the center position of the first left vibration isolating member 176 is approximately the same as the position of the center of gravity G1 of the motor unit 10.

[0099] As shown in FIG. 22, when the motor unit 10 is placed on the placement surface P1, the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed below the upper end 86a of the motor 86. The upper end 86a of the motor 86 is substantially flush with the upper end of the outer rotor body 136. In FIGS. 20 to 23, the vertical position of the upper end 86a of the motor 86 is shown by a dashed line. The first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed below the central axis 140a of the motor shaft 140. The first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed above the lower end 86b of the motor 86. The lower end 86b of the motor 86 is substantially flush with the lower end of the outer rotor body 136. In FIGS. 20 to 23, the vertical position of the lower end 86b of the motor 86 is shown by a dashed line. The first right vibration isolating member 170 is disposed symmetrically with the first left vibration isolating member 176 with respect to an orthogonal plane P2 that is orthogonal to the placement surface P1 and includes the central axis 140a of the motor shaft 140 (i.e., the front-rear direction). The distance between the first right vibration isolating member 170 and the orthogonal plane P2 is substantially the same as the distance between the first left vibration isolating member 176 and the orthogonal plane P2. When the motor unit 10 is viewed in the front-rear direction, the motor 86 and the fan 88 are disposed between the first right vibration isolating member 170 and the first left vibration isolating member 176. When the motor unit 10 is viewed in the left-right direction, the motor 86 and the fan 88 at least partially overlap with the first right vibration isolating member 170 and the first left vibration isolating member 176 (see FIG. 21), respectively.

[0100] As shown in FIG. 23, when the motor unit 10 is placed on the placement surface P1, the second right vibration isolating member 172 and the second left vibration isolating member 178 are disposed above the lower end 86b of the motor 86. The second right vibration isolating member 172 and the second left vibration isolating member 178 are disposed above the central axis 140a of the motor shaft 140. The vertical center of the second right vibration isolating member 172 and the vertical center of the second left vibration isolating member 178 are disposed below the upper end 86a of the motor 86. The upper end of the second right vibration isolating member 172 and the upper end of the second left vibration isolating member 178 are disposed above the upper end 86a of the motor 86. The second right vibration isolating member 172 is disposed symmetrically with the second left vibration isolating member 178 with respect to the orthogonal plane P2. The distance between the second right vibration isolating member 172 and the orthogonal plane P2 is substantially the same as the distance between the second left vibration isolating member 178 and the orthogonal plane P2. When the motor unit 10 is viewed in the front-rear direction, the motor 86 and the fan 88 (see FIG. 22) are disposed between the second right vibration isolating member 172 and the second left vibration isolating member 178. When the motor unit 10 is viewed in the front-rear direction, the second right vibration isolating member 172 entirely overlaps with the third right vibration isolating member 174 (see FIG. 20), and the second left vibration isolating member 178 entirely overlaps with the third left vibration isolating member 180 (see FIG. 21). The third right vibration isolating member 174 is disposed symmetrically with the third left vibration isolating member 180 with respect to the orthogonal plane P2. Furthermore, when the motor unit 10 is viewed in the front-rear direction, the motor 86 and the fan 88 are disposed between the third right vibration isolating member 174 and the third left vibration isolating member 180.

[0101] When the motor unit 10 is viewed in the left-right direction, the motor 86 is disposed between the second right vibration isolating member 172 and the second left vibration isolating member 178 (see FIG. 21). As shown in FIG. 20, the second right vibration isolating member 172 and the second left vibration isolating member 178 are disposed in front of the fan 88. The third right vibration isolating member 174 and the third left vibration isolating member 180 (see FIG. 21) are disposed behind the fan 88.

[0102] As shown in FIG. 18, the right cover member 96 is disposed on the right side of the right wall 154a of the plate body 154. The first right vibration isolating member 170, the second right vibration isolating member 172, and the third right vibration isolating member 174 are sandwiched 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 isolating member 170, the second right vibration isolating member 172, and the third right vibration isolating member 174. The right cover member 96 does not abut against the plate member 92. As shown in FIG. 12, the right cover member 96 is disposed between the right main body housing 14 and the right wall 154a of the plate body 154. The right cover member 96 is fixed to the right main body housing 14. This prevents the first right vibration isolating member 170 (see FIG. 18), the second right vibration isolating member 172 (see FIG. 18), and the third right vibration isolating member 174 (see FIG. 18) from coming off the plate member 92.

[0103] As shown in FIG. 19, the left cover member 98 is disposed on the left side of the left wall 154b of the plate body 154. The first left vibration isolating member 176, the second left vibration isolating member 178, and the third left vibration isolating member 180 are sandwiched 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 isolating member 176, the second left vibration isolating member 178, and the third left vibration isolating member 180. The left cover member 98 does not abut against the plate member 92. As shown in FIG. 12, the left cover member 98 is disposed between the left body housing 16 and the left wall 154b of the plate body 154. The left cover member 98 is fixed to the left body housing 16. This prevents the first left vibration isolating member 176 (see FIG. 19), the second left vibration isolating member 178 (see FIG. 19), and the third left vibration isolating member 180 (see FIG. 19) from coming off the plate member 92.

[0104] 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 facing the upper surface of the plate body 154 of the plate member 92, a right wall 184b facing the right surface of the right cover member 96, and a left wall 184c facing the left surface of the left cover member 98. The plate member 92, the right cover member 96, and the left cover member 98 are sandwiched between the right wall 184b and the left wall 184c.

[0105] The upper wall 184a has two right positioning holes 185a and two left positioning holes 185b. The right positioning hole 185a penetrates the upper wall 184a in the up-down direction. The right positioning hole 185a is disposed at the right end of the upper wall 184a. The two right positioning holes 185a are lined up in the front-rear direction. The left positioning hole 185b penetrates the upper wall 184a in the up-down direction. The left positioning hole 185b is disposed at the left end of the upper wall 184a. The two left positioning holes 185b are lined up in the front-rear direction.

[0106] The right cover member 96 has two right positioning protrusions 96a that protrude upward, and the right positioning holes 185a receive the right positioning protrusions 96a. The left cover member 98 has two left positioning protrusions 98a that protrude upward, and the left positioning holes 185b receive the left positioning protrusions 98a. This positions the support plate 184 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 a screw 185c. The support plate 184 is fixed to the left cover member 98 by a screw 185d.

[0107] 22, the right wall 184b is sandwiched between the right surface of the right cover member 96 and the right main body housing 14. The right wall 184b, the right cover member 96, and the right main body housing 14 are fixed to one another with screws 186. The left wall 184c is sandwiched between the left surface of the left cover member 98 and the left main body housing 16. The left wall 184c, the left cover member 98, and the left main body housing 16 are fixed to one another with screws 188.

[0108] As shown in FIG. 25, the control unit 102 is disposed on the rear side of the motor housing 84. The control unit 102 is disposed inside the main body housing 12 (see FIG. 4). The control unit 102 includes a board housing 192, a filter member 194 (see FIG. 26), a control circuit board 196 (see FIG. 26), and a board case 197 (see FIG. 26). The board housing 192 includes an outer housing portion 198 and an inner housing portion 199 (see FIG. 26). The outer housing portion 198 defines the outer shape of the control unit 102. The outer housing portion 198 is fixed to the rear end of the support plate 184 by a screw 190. As shown in FIG. 26, the outer housing portion 198 has an internal space 200 therein. The outer housing portion 198 also has an intake port 202. The intake port 202 is located at the rear of the outer housing portion 198. The intake port 202 communicates the interior space 200 with the outside of the substrate housing 192 .

[0109] The inner housing part 199 is disposed in the internal space 200. The inner housing part 199 is disposed in front of the intake port 202. The inner housing part 199 is fixed to the outer housing part 198. The inner housing part 199 has a board accommodating space 203 therein.

[0110] The filter member 194 is disposed in the internal space 200. The filter member 194 is disposed in front of the intake port 202. The filter member 194 blocks the intake port 202. The filter member 194 has fine air holes (not shown) therein. The filter member 194 is made of, for example, a filter material or a foam material. Air flows through the air holes in the filter member 194. The filter member 194 removes foreign matter such as dust that flows with the air as the air flows through the air holes.

[0111] The control circuit board 196 is disposed in the board housing space 203. The control circuit board 196 has a microcomputer 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 microcomputer. The control circuit board 196 is disposed along a surface along the up-down direction and the left-right direction. The control circuit board 196 is disposed in front of the intake port 202. The control circuit board 196 is disposed behind the motor intake port 128 of the rear bracket 112. The control circuit board 196 controls the motor 86 (see FIG. 13). As shown in FIG. 13, the control circuit board 196 is disposed on the central axis 140a of the motor shaft 140. The control circuit board 196 is disposed behind the fan 88. When the motor unit 10 is viewed in the front-rear direction, the control circuit board 196 at least partially overlaps with each of the motor 86 and the fan 88. The motor 86, the fan 88, and the control circuit board 196 are aligned in a line in the front-to-rear direction.

[0112] As shown in FIG. 26, the board case 197 is disposed in the board accommodation space 203. The board case 197 is disposed in front of the intake port 202. The board case 197 is disposed between the control circuit board 196 and the intake port 202. The board case 197 supports the control circuit board 196. The control circuit board 196 is disposed inside the board case 197. The board case 197 is fixed to the inner housing part 199. The board case 197 is provided with a heat dissipation fin 204. The heat dissipation fin 204 has a flat plate shape extending in the up-down direction and the front-rear direction. The inner housing part 199 has a through hole 199a penetrating the rear end of the inner housing part 199, and the heat dissipation fin 204 penetrates the through hole 199a. The heat dissipation fin 204 faces the intake port 202 in the front-rear direction.

[0113] The cylindrical vibration-damping member 104 is disposed in front of the board housing 192 and behind the rear bracket 112. The cylindrical vibration-damping member 104 is made of an elastic material. The material of the cylindrical vibration-damping member 104 is the same as that of the first right vibration-damping member 170 (see FIG. 18). The cylindrical vibration-damping member 104 has a cylindrical shape. Here, the cylindrical shape includes a bellows shape having a circular cross section. The cylindrical vibration-damping member 104 has an air passage 208 therein. The cylindrical vibration-damping member 104 is fixed to the front end of the board housing 192 and the rear end of the rear bracket 112. The front end of the board housing 192 is open, and the cylindrical vibration-damping member 104 surrounds the front end of the board housing 192. The air passage 208 communicates with the internal space 200 via the front end of the board housing 192. The cylindrical vibration-isolating member 104 surrounds the motor intake port 128 of the rear bracket 112. The air passage 208 communicates with the fan accommodating space 126 via the motor intake port 128. As shown in Figure 13, when the motor unit 10 is viewed in the front-rear direction, the air passage 208 at least partially overlaps with each of the motor 86 and the fan 88.

[0114] 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. 15, air passes through the intake port 26a and flows from the outside of the motor unit 10 into the accommodation space 18 of the main body housing 12. In the drawing, the flow of air is indicated by an arrow line labeled with the symbol F1. The flowing air flows rearward between the motor housing 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 main body housing 12.

[0115] As shown in FIG. 26, the air flows around the outer housing part 198, passes through the intake port 202, and flows into the internal space 200. The air passes through the filter member 194, and flows upward along the heat dissipation fins 204 between the outer housing part 198 and the inner housing part 199. As the air passes through the filter member 194, foreign matter flowing with the air is removed from the air. In addition, as the air flows along the heat dissipation fins 204, the control circuit board 196 is cooled. Next, the air flows forward between the outer housing part 198 and the inner housing part 199, passes through the air passage 208 of the cylindrical vibration-proof member 104 and the motor intake port 128 of the rear bracket 112, and flows from the internal space 200 into the fan accommodating space 126.

[0116] As shown in FIG. 15 , the air that has flowed into the fan accommodating space 126 is sent by the fan 88 in a direction away from the central axis 140a (toward the radial outside of the fan 88). Next, the air flows from the fan accommodating space 126 into the motor accommodating space 122. The air that has flowed into the motor accommodating space 122 flows forward between the inside and outside of the motor 86, thereby cooling the motor 86. The air then passes through the exhaust port 124 of the front bracket 110 and is discharged from the motor accommodating space 122 to the outside of the motor unit 10.

[0117] 2, 3, and 27 to 33, the motor unit 10 is applicable to a plurality of 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 related to the motor unit 10 described above for explanation. Specifically, the direction perpendicular to the placement surface P1 is called the up-down direction, the direction perpendicular to the up-down direction is called the front-rear direction, and the direction perpendicular to the up-down direction and the front-rear direction is called the left-right direction.

[0118] As shown in Fig. 27, the motor unit 10 can be attached to a rammer 4a. The rammer 4a is a ground compaction device that compacts the ground. The rammer 4a includes an upper housing 300, a handle unit 302, and a working unit 304. The upper housing 300 includes a fixing base 308 located at the rear upper portion. The fixing base 308 is fixed to the second fixing surface 150a of the motor unit 10.

[0119] Before describing the detailed configuration of the fixing base 308, the detailed configuration of the second fixing part 150 of the motor unit 10 will be described. 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 an auxiliary hole 150e. The positioning holes 150b, the first fixing holes 150c, the second fixing holes 150d, and the auxiliary hole 150e are arranged on the second fixing surface 150a. The 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 the arrangement of the multiple holes of the engine unit that can be attached to the rammer 4a. Therefore, the motor unit 10 can be used by fixing the second fixing part 150 to the working unit 4 to which the engine unit can be attached.

[0120] 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 at intervals of 180 degrees around the central axis 140a. The two positioning holes 150b are arranged on an orthogonal plane P2.

[0121] Each of the four first fixing holes 150c is spaced a certain distance from the central axis 140a. The four first fixing holes 150c are arranged at 90 degree intervals around the central axis 140a. The distance between the first fixing holes 150c and the central axis 140a is slightly shorter than the distance between the positioning hole 150b and the central axis 140a. Two of the first fixing holes 150c are arranged to the right of the orthogonal plane P2, and the remaining two first fixing holes 150c are arranged to the left of the orthogonal plane P2.

[0122] Each of the four second fixing holes 150d is spaced a certain distance from the central axis 140a. The distance between the second fixing holes 150d and the central axis 140a is longer than the distance between the positioning hole 150b and the central axis 140a. Two of the second fixing holes 150d are disposed to the right of the orthogonal plane P2, and the remaining two second fixing holes 150d are disposed to the left of the orthogonal plane P2. The auxiliary hole 150e is slightly farther from the central axis 140a than the second fixing holes 150d.

[0123] 29, the fixing base 308 has two positioning holes 308a and four fixing holes 308b. The arrangement of the two positioning holes 308a and the four fixing holes 308b is the same as the arrangement of the two positioning holes 150b and the four second fixing holes 150d of the second fixing part 150.

[0124] As shown in FIG. 29 and FIG. 30, when the second fixing part 150 is fixed to the fixing base 308, first, the two positioning pins 309a are inserted into the positioning holes 308a and 150b. As a result, the second fixing part 150 is positioned relative to the fixing base 308. As a result, the fixing hole 308b faces the second fixing hole 150d. Next, the four screws 309b are inserted into the fixing holes 308b and screwed into the second fixing holes 150d. As a result, the second fixing part 150 is fixed to the fixing base 308 in a state where it is positioned relative to the fixing base 308. When the second fixing part 150 is fixed to the fixing base 308, the motor shaft 140 of the motor unit 10 protrudes downward from the main body housing 12.

[0125] As shown in FIG. 2, the handle unit 302 includes a first handle 310, a second handle 312, and a third handle 314. The first handle 310 extends rearward from the upper end of the upper housing 300, then bends to extend rightward, and then bends to extend forward. The first handle 310 surrounds the motor unit 10. The second handle 312 extends upward from the upper end of the upper housing 300, then bends to extend rightward, and then 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 rightward, and then 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 held by a user during work.

[0126] As shown in FIG. 27, the working unit 304 includes an extendable unit 320, a ground leveling unit 322, a shaft receiving unit 324, and a drive unit 326. The extendable unit 320 is fixed to the lower part of the upper housing 300. The extendable unit 320 is extendable. The ground leveling unit 322 is disposed below the upper housing 300. The upper part of the ground leveling unit 322 is surrounded by the extendable unit 320. The ground leveling unit 322 is fixed to the extendable unit 320. The ground leveling unit 322 includes a ground leveling plate 328 located at the lower end. The ground leveling plate 328 comes into surface contact with the placement surface P1.

[0127] The shaft receiving portion 324 and the driving portion 326 are disposed inside the upper housing 300. The shaft receiving portion 324 is fixed to the motor shaft 140 of the motor unit 10. The driving portion 326 is fixed to the shaft receiving portion 324. The driving portion 326 operates the ground leveling portion 322 when the motor shaft 140 rotates. This repeatedly executes a moving away operation that moves the ground leveling portion 322 away from the mounting surface P1 and an approaching operation that moves the ground leveling portion 322 closer to the mounting surface P1. The ground leveling plate 328 is repeatedly pressed against the mounting surface P1, thereby hardening the mounting surface P1, such as the ground.

[0128] As shown in Fig. 31, the motor unit 10 can be attached to a plate compactor 4b. The plate compactor 4b is a ground compaction device that compacts the ground. The force with which the plate compactor 4b compacts the ground is smaller than the force with which the rammer 4a compacts the ground. The plate compactor 4b includes a base 350, a handle unit 352, a transmission device 354, and a working unit 356.

[0129] The base 350 includes a fixing base 360. The fixing base 360 ​​is fixed to the first fixing surface 148a of the motor unit 10.

[0130] Before describing the detailed configuration of the fixing base 360, the detailed configuration of the first fixing portion 148 of the motor unit 10 will be described. As shown in FIG. 32, the first fixing portion 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 on 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 portion 148 in the up-down direction. The 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 the arrangement of the holes of the engine unit that can be attached to the plate compactor 4b. In addition, the distance between the first fixing surface 148a and the central axis 140a of the motor shaft 140 (see FIG. 28) is the same as the distance between the fixing surface of the engine unit and the shaft of the engine. Therefore, the motor unit 10 can be used by fixing the first fixing part 148 to the working unit 4 to which the engine unit can be attached.

[0131] The first positioning hole 148b and the second positioning hole 148c are disposed at the front end of the first fixing portion 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.

[0132] The first fixing hole 148d and the second fixing hole 148e are disposed at the rear end of the first fixing portion 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-rear direction. The shape of the first fixing hole 148d is substantially the same as the shape of the first positioning hole 148b. The second fixing hole 148e and the second positioning hole 148c are aligned in the front-rear direction. The shape of the second fixing hole 148e is substantially the same as the shape of the second positioning hole 148c.

[0133] The fixed base 360 ​​has a first positioning protrusion 361a, a second positioning protrusion 361b, a first fixing hole 361c, and a second fixing hole 361d. The first positioning protrusion 361a and the second positioning protrusion 361b protrude upward from an upper surface 360a of the fixed base 360. The first positioning protrusion 361a and the second positioning protrusion 361b have a cylindrical shape. The first positioning protrusion 361a and the second positioning protrusion 361b are aligned in the left-right direction.

[0134] 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-rear direction. The second fixing hole 361d and the second positioning protrusion 361b are aligned in the front-rear direction.

[0135] The first fixing hole 361c includes a first long hole portion 361c1 extending in the front-rear direction and a first round hole portion 361c2 disposed at the lower end of the first long hole portion 361c1. The second fixing hole 361d includes a second long hole portion 361d1 extending in the front-rear direction and a second round hole portion 361d2 disposed at the lower end of the second long hole portion 361d1.

[0136] When the first fixing part 148 is fixed to the fixing base 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. This positions the first fixing part 148 relative to the fixing base 360. In addition, since the second positioning hole 148c is an elongated hole, the first fixing part 148 can be positioned relative to the fixing base 360 ​​even when the distance between the first positioning protrusion 361a and the second positioning protrusion 361b varies from product to product. Next, the screw 362a is inserted from the upper side of the first fixing part 148 into the first fixing hole 361c and the first elongated hole portion 361c1, and screwed into the first round hole portion 361c2. Next, the screw 362a is inserted from above the first fixing portion 148 into the second fixing hole 361d and the second long hole portion 361d1, and screwed into the second round hole portion 361d2. Next, the two nuts 362b are screwed into the first positioning protrusion 361a and the second positioning protrusion 361b, respectively. As a result, the first fixing portion 148 is fixed to the upper surface 360a of the fixing base 360 ​​in a state where it is positioned relative to the fixing base 360. When the first fixing portion 148 is fixed to the fixing base 360, the motor shaft 140 of the motor unit 10 extends in the left-right direction.

[0137] 3, the handle unit 352 includes a first handle 364 and a second handle 366. The first handle 364 extends from the rear end of the base 350 to the upper rear side, then bends and extends to the right, and further bends and extends to the lower front side. The first handle 364 is disposed on the rear side of the motor unit 10. The first handle 364 is gripped by the user during work.

[0138] The second handle 366 extends upward from the rear end of the base 350, then bends to extend forward and upward, further bends to extend forward, and further bends to extend downward. The second handle 366 is disposed so as to surround the motor unit 10. The second handle 366 is gripped by a user, for example, when lifting the plate compactor 4b.

[0139] 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 stretched between the first pulley 370 and the second pulley 374. The second pulley 374 is disposed forward of the first pulley 370.

[0140] The working unit 356 includes a vibrator 378 and a leveling plate 380. The vibrator 378 is fixed to the second pulley 374. When the second pulley 374 rotates, the vibrator 378 operates the leveling plate 380. This causes the leveling plate 380 to move up and down. The leveling plate 380 is repeatedly pressed against the support surface P1, thereby hardening the support surface P1, such as the ground.

[0141] When the rammer 4a (see FIG. 27) and the plate compactor 4b operate, the rammer 4a and the plate compactor 4b vibrate. As a result, the vibration of the rammer 4a and the plate compactor 4b is transmitted to the motor unit 10 via the motor shaft 140. As shown in FIG. 22, the vibration transmitted to the motor shaft 140 is transmitted from the motor 86 to the motor housing 84. Next, the vibration is transmitted from the motor housing 84 to the plate member 92, and then to the vibration-proof part 94. When vibrations are transmitted to the vibration-isolating part 94, the first right vibration-isolating member 170, the second right vibration-isolating member 172 (see FIG. 18), and the third right vibration-isolating member 174 (see FIG. 18) elastically deform in the up-down direction, the left-right direction, and the front-rear direction between the right wall 154a of the plate member 92 and the right cover member 96, and the first left vibration-isolating member 176, the second left vibration-isolating member 178 (see FIG. 18), and the third left vibration-isolating member 180 (see FIG. 18) elastically deform in the up-down direction, the left-right direction, and the front-rear direction between the left wall 154b of the plate member 92 and the left cover member 98. This dampens the vibrations, and the transmission of the vibrations to the right cover member 96 and the left cover member 98 is suppressed. This prevents vibrations from being transmitted to the battery pack BP (see FIG. 4) via the main housing 12, and also prevents vibrations from being transmitted to the control circuit board 196 (see FIG. 26) of the control unit 102 via the support unit 100.

[0142] 26, the vibrations transmitted to the motor housing 84 are transmitted to the cylindrical vibration-damping member 104. When the vibrations are transmitted to the cylindrical vibration-damping member 104, the cylindrical vibration-damping member 104 elastically deforms in the up-down, left-right, and front-rear directions between the motor housing 84 and the board housing 192. This dampens the vibrations and suppresses their transmission to the board housing 192. As a result, the vibrations are suppressed from being transmitted to the control circuit board 196.

[0143] As shown in FIG. 33, the motor unit 10 can be attached to a slope grass cutter 4c. The slope grass cutter 4c is a device for cutting grass. The slope 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 unit 408. The housing 400 includes a fixing base 412 located at an upper portion. The fixing base 412 is fixed to a second fixing surface 150a of the motor unit 10. The motor shaft 140 of the motor unit 10 protrudes downward from the main housing 12.

[0144] The pair of front wheels 402 are rotatably supported on the front part of the housing 400. The pair of rear wheels 404 are rotatably supported on the rear part of the housing 400. As the pair of front wheels 402 and the pair of rear wheels 404 rotate, the slope grass mower 4c moves on the mounting surface P1.

[0145] The handle unit 406 includes a fixed frame 416, a handle 418, and a trigger 420. The fixed frame 416 has a substantially U-shape. Both ends of the fixed frame 416 in the longitudinal direction are fixed to the housing 400.

[0146] The handle 418 is attached to the upper part of the fixed frame 416. A user moves the slope grass mower 4c by gripping the handle 418 and pushing it forward.

[0147] The trigger 420 is rotatably attached to the handle 418. The trigger 420 is operated by a user's hand holding the handle 418 so as to approach the handle 418. When the trigger 420 is operated, the motor 86 of the motor unit 10 operates.

[0148] The working unit 408 includes a connecting portion 424, a transmission shaft 426, and a blade 428. The connecting portion 424 connects the motor shaft 140 and the transmission shaft 426.

[0149] The transmission shaft 426 extends in the vertical direction. The transmission shaft 426 rotates integrally with the motor shaft 140 around a central axis 140a that extends in the vertical direction.

[0150] The blade 428 is fixed to the lower end of the transmission shaft 426. The blade 428 rotates around the central axis 140a together with the transmission shaft 426. This causes the grass to be cut.

[0151] (effect) The motor unit 10 of this embodiment is detachably attached to the working unit 4 and operates the working unit 4. The motor unit 10 extends in the front-rear direction (an example of a first direction) and includes a motor 86 having a motor shaft 140 that operates the working unit 4, a control circuit board 196 that operates the motor 86, a motor housing 84 that supports the motor 86, a main body housing 12 that is disposed outside the control circuit board 196 and the motor housing 84, a first fixing portion 148 that can be fixed to the working unit 4, a first right vibration-proof member 170 (an example of a first vibration-proof member) that is disposed between the main body housing 12 and the motor housing 84, and a first left vibration-proof member 176 (a second vibration-proof member) that is disposed between the main body housing 12 and the motor housing 84. The first fixing portion 148 can be placed on the mounting surface P1 when the motor unit 10 is placed on the mounting surface P1, and is disposed approximately parallel to the motor shaft 140. When the motor unit 10 is placed on the mounting surface P1, at least a portion of the first right vibration isolating member 170 and at least a portion of the first left vibration isolating member 176 are disposed below the upper end of the motor 86 in the up-down direction perpendicular to the mounting surface P1. When the motor unit 10 is viewed in the front-rear direction, the motor 86 is disposed between the first right vibration isolating member 170 and the first left vibration isolating member 176.

[0152] According to the above configuration, at least a portion of the first right vibration isolating member 170 and at least a portion of the first left vibration isolating member 176 are disposed below the upper end of the motor 86, and the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed on either side of the motor 86. Therefore, the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed symmetrically with respect to the motor 86. This allows vibrations of the motor 86 to be sufficiently damped.

[0153] Furthermore, the motor shaft 140 extends along the mounting surface P1 when the motor unit 10 is placed on the mounting surface P1. The first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed below the central axis 140a of the motor shaft 140 when the motor unit 10 is placed on the mounting surface P1.

[0154] In general, the components of the motor unit 10 are often disposed in the space above the upper end of the motor 86. According to the above configuration, the empty space below the central axis 140a of the motor shaft 140 can be utilized.

[0155] Furthermore, the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed above the lower end of the motor 86 when the motor unit 10 is placed on the placement surface P1.

[0156] According to the above configuration, the space between the central axis 140a of the motor shaft 140 and the lower end of the motor 86 can be utilized.

[0157] The first right vibration isolating member 170 is perpendicular to the placement surface P1 and is a first distance away from an orthogonal plane P2 including the front-rear direction. The first left vibration isolating member 176 is a first distance away from the orthogonal plane P2.

[0158] According to the above configuration, the distance between the first right vibration isolating member 170 and the orthogonal plane P2 is the same as the distance between the first left vibration isolating member 176 and the orthogonal plane P2. Therefore, the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed symmetrically with respect to the orthogonal plane P2. This makes it possible to further attenuate vibrations of the motor 86.

[0159] The position of the center of gravity G1 of the motor unit 10 in the front-rear direction is substantially the same as the center position of the first right vibration isolating member 170 in the front-rear direction and the center position of the first left vibration isolating member 176 in the front-rear direction.

[0160] According to the above configuration, the vibration of the motor 86 can be further damped.

[0161] The motor unit 10 further includes a second right vibration isolating member 172 (an example of a third vibration isolating member) disposed between the main body housing 12 and the motor housing 84, and a second left vibration isolating member 178 (a fourth vibration isolating member) disposed between the main body housing 12 and the motor housing 84. At least a portion of the second right vibration isolating member 172 and at least a portion of the second left vibration isolating member 178 are disposed 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 in the front-rear direction, the motor 86 is disposed between the second right vibration isolating member 172 and the second left vibration isolating member 178.

[0162] According to the above configuration, vibrations of the motor 86 can be damped more effectively than in a configuration in which the motor unit 10 is provided with only the first right vibration isolating member 170 and the first left vibration isolating member 176.

[0163] The second right vibration isolating member 172 is disposed on the same side as the first right vibration isolating member 170 with respect to the orthogonal plane P2 that is perpendicular to the placement surface P1 and includes the front-to-rear direction. The second left vibration isolating member 178 is disposed on the same side as the first left vibration isolating member 176 with respect to the orthogonal plane P2. The distance between the first right vibration isolating member 170 and the second right vibration isolating member 172 is approximately the same as the distance between the first left vibration isolating member 176 and the second left vibration isolating member 178.

[0164] According to the above configuration, the second right vibration isolating member 172 and the second left vibration isolating member 178 are disposed symmetrically with respect to the orthogonal plane P2. This makes it possible to further attenuate vibrations of the motor 86.

[0165] In addition, the motor unit 10 further includes a plate member 92 fixed to the motor housing 84. The first right vibration isolating member 170 and the first left vibration isolating member 176 are fixed to the plate member 92 and the main housing 12.

[0166] If the first right vibration isolating member 170 and the first left vibration isolating member 176 were directly fixed to the motor housing 84, the configuration of the motor housing 84 would be complex. With the above configuration, it is possible to prevent the configuration of the motor housing 84 from becoming complicated.

[0167] In addition, the motor unit 10 further includes a second fixing portion 150 that is fixed to a working unit 4 of a different type to the working unit 4 fixed to the first fixing portion 148.

[0168] According to the above configuration, the types of working units 4 that can use the motor unit 10 can be increased.

[0169] The motor unit 10 further includes a fan 88 fixed to the motor 86, a board housing 192 supporting a control circuit board 196, and a cylindrical vibration-isolating member 104 having a cylindrical shape and disposed between the motor housing 84 and the board housing 192. When the fan 88 rotates, air cools the control circuit board 196 and passes through the inside of the cylindrical vibration-isolating member 104.

[0170] According to the above configuration, when motor 86 vibrates, cylindrical vibration-proof member 104 damps the vibration of motor 86. In addition, air that cools control circuit board 196 passes through the inside of cylindrical vibration-proof member 104. By using cylindrical vibration-proof member 104, it is possible to suppress vibration of motor 86 and cool control circuit board 196 with a single part.

[0171] The main housing 12 also has a first battery mounting section 22 to which a first battery pack BP1 (an example of a first battery) that supplies power to the motor 86 is removably attached, and a second battery mounting section 24 to which a second battery pack BP2 (an example of a second battery) that supplies power to the motor 86 is removably attached.

[0172] According to the above configuration, the output of the motor unit 10 can be increased, or the operating time of the motor unit 10 can be extended.

[0173] Furthermore, when the motor unit 10 is viewed in the front-rear direction, the control circuit board 196 at least partially overlaps the motor 86 .

[0174] According to the above configuration, when the motor unit 10 is viewed in the front-to-rear direction, the motor unit 10 is prevented from becoming larger in the direction perpendicular to the front-to-rear direction, compared to a configuration in which the control circuit board 196 does not at least partially overlap with the motor 86.

[0175] The motor unit 10 of this embodiment is detachably attached to the working unit 4 and operates the working unit 4. The motor unit 10 extends in the front-rear direction (an example of a first direction) and includes a motor 86 having a motor shaft 140 that operates the working unit 4, a control circuit board 196 that operates the motor 86, a motor housing 84 that supports the motor 86, a main body housing 12 that is disposed outside the control circuit board 196 and the motor housing 84, a second fixed portion 150 that is fixed to the working unit 4, a first right vibration isolating member 170 (an example of a first vibration isolating member) that is disposed between the main body housing 12 and the motor housing 84, and a first left vibration isolating member 176 (an example of a second vibration isolating member) that is disposed between the main body housing 12 and the motor housing 84. The motor shaft 140 is substantially perpendicular to the second fixed portion 150. When the motor unit 10 is placed on the mounting surface P1, at least a portion of the first right vibration isolating member 170 and at least a portion of the first left vibration isolating member 176 are disposed below the upper end of the motor 86 in the up-down direction perpendicular to the mounting surface P1. When the motor unit 10 is viewed in the front-rear direction, the motor 86 is disposed between the first right vibration isolating member 170 and the first left vibration isolating member 176.

[0176] According to the above configuration, at least a portion of the first right vibration isolating member 170 and at least a portion of the first left vibration isolating member 176 are disposed below the upper end of the motor 86, and the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed on either side of the motor 86. Therefore, the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed symmetrically with respect to the motor 86. This allows vibrations of the motor 86 to be sufficiently damped.

[0177] Furthermore, the motor shaft 140 extends along the mounting surface P1 when the motor unit 10 is placed on the mounting surface P1. The first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed below the central axis 140a of the motor shaft 140 when the motor unit 10 is placed on the mounting surface P1.

[0178] In general, the components of the motor unit 10 are often disposed in the space above the upper end of the motor 86. According to the above configuration, the empty space below the central axis 140a of the motor shaft 140 can be utilized.

[0179] The first right vibration isolating member 170 is perpendicular to the placement surface P1 and is a first distance away from an orthogonal plane P2 including the front-rear direction. The first left vibration isolating member 176 is a first distance away from the orthogonal plane P2.

[0180] According to the above configuration, the distance between the first right vibration isolating member 170 and the orthogonal plane P2 is the same as the distance between the first left vibration isolating member 176 and the orthogonal plane P2. Therefore, the first right vibration isolating member 170 and the first left vibration isolating member 176 are disposed symmetrically with respect to the orthogonal plane P2. When the motor 86 vibrates, the first right vibration isolating member 170 and the first left vibration isolating member 176, for example, deform more uniformly. This makes it possible to further attenuate vibrations of the motor 86.

[0181] The main housing 12 also has a first battery mounting section 22 to which a first battery pack BP1 (an example of a first battery) that supplies power to the motor 86 is removably attached, and a second battery mounting section 24 to which a second battery pack BP2 (an example of a second battery) that supplies power to the motor 86 is removably attached.

[0182] According to the above configuration, the output of the motor unit 10 can be increased, or the operating time of the motor unit 10 can be extended.

[0183] The motor unit 10 of this embodiment is detachably attached to the working unit 4 and operates the working unit 4. The motor unit 10 extends in the front-rear direction (an example of a first direction) and includes a motor 86 having a motor shaft 140 that operates the working unit 4, a control circuit board 196 that operates the motor 86, a fan 88 fixed to the motor 86, a motor housing 84 that supports the motor 86, a board housing 192 that supports the control circuit board 196, a main body housing 12 that is disposed outside the motor housing 84 and the board housing 192, a fixed unit 90 that is fixed to the working unit 4, and a cylindrical vibration-proof member 104 that is disposed between the motor housing 84 and the board housing 192 and has a cylindrical shape. When the fan 88 rotates, air cools the control circuit board 196 and passes through the inside of the cylindrical vibration-proof member 104.

[0184] According to the above configuration, when the motor 86 vibrates, the cylindrical vibration-damping member 104 damps the vibration of the motor 86. In addition, air that cools the control circuit board 196 passes through the inside of the cylindrical vibration-damping member 104. By using the cylindrical vibration-damping member 104, it is possible to suppress the vibration of the motor 86 and cool the control circuit board 196 with a single part. This allows the number of parts in the motor unit 10 to be reduced.

[0185] The motor unit 10 also includes a plate member 92 fixed to the motor housing 84, a support unit 100 supporting the board housing 192, and a vibration-isolating part 94 (an example of a vibration-isolating member) fixed to the plate member 92 and the support unit 100.

[0186] According to the above configuration, the vibration of the motor 86 is damped by the cylindrical vibration-isolating member 104 and the vibration-isolating portion 94. This makes it possible to suppress the transmission of vibration to the control circuit board 196.

[0187] Furthermore, when the motor unit 10 is viewed in the front-rear direction, the cylindrical vibration-isolating member 104 at least partially overlaps with the motor 86 .

[0188] According to the above configuration, when the motor unit 10 is viewed in the fore-and-aft direction, the motor unit 10 is prevented from becoming larger in the direction perpendicular to the fore-and-aft direction, compared to a configuration in which the tubular vibration-damping member 104 does not at least partially overlap with the motor 86.

[0189] The main housing 12 also has a first battery mounting section 22 to which a first battery pack BP1 (an example of a first battery) that supplies power to the motor 86 is removably attached, and a second battery mounting section 24 to which a second battery pack BP2 (an example of a second battery) that supplies power to the motor 86 is removably attached.

[0190] According to the above configuration, the output of the motor unit 10 can be increased, or the operating time of the motor unit 10 can be extended.

[0191] (Second Example) In the second embodiment, differences from the first embodiment will be described. As shown in Fig. 34, in the second embodiment, the first battery mounting portion 22 and the second battery mounting portion 24 are disposed on the rear wall 20d of the storage portion 20. The first battery mounting portion 22 and the second battery mounting portion 24 are disposed side by side in the left-right direction. When the motor unit 10 is viewed in the front-rear direction, the first battery mounting portion 22 does not overlap with the second battery mounting portion 24.

[0192] The first battery pack BP1 is attached to the first battery mounting portion 22 by sliding it in an attachment direction D1, and is removed from the first battery mounting portion 22 by sliding it in a removal direction D2 opposite to the attachment direction D1. The attachment direction D1 is a downward direction. The removal direction D2 is an upward direction. The second battery pack BP2 is attached to the second battery mounting portion 24 by sliding it in the first direction, and is removed from the second battery mounting portion 24 by sliding it in the removal direction D2.

[0193] (Third Example) In the third embodiment, differences from the first embodiment will be described. As shown in Fig. 35, in the third embodiment, the first battery mounting portion 22 and the second battery mounting portion 24 are disposed on the left wall 20e of the storage portion 20. The first battery mounting portion 22 and the second battery mounting portion 24 are disposed side by side in the front-rear direction. When the motor unit 10 is viewed in the left-right direction, the first battery mounting portion 22 does not overlap with the second battery mounting portion 24.

[0194] The first battery pack BP1 is attached to the first battery mounting portion 22 by sliding it in an attachment direction D1, and is removed from the first battery mounting portion 22 by sliding it in a removal direction D2 opposite to the attachment direction D1. The attachment direction D1 is a downward direction. The removal direction D2 is an upward direction. The second battery pack BP2 is attached to the second battery mounting portion 24 by sliding it in the first direction, and is removed from the second battery mounting portion 24 by sliding it in the removal direction D2.

[0195] (Fourth Example) In the fourth embodiment, differences from the first embodiment will be described. As shown in Fig. 36, the first right vibration isolating member 170 is disposed above the center of gravity G1 of the motor unit 10 and the central axis 140a of the motor shaft 140. The center of the first right vibration isolating member 170 in the up-down direction is disposed below the upper end 86a of the motor 86. The upper end of the first right vibration isolating member 170 is disposed above the upper end 86a of the motor 86. In the front-rear direction, the position of the center of the first right vibration isolating member 170 is substantially the same as the position of the center of gravity G1 of the motor unit 10.

[0196] The second right vibration isolating member 172 and the third right vibration isolating member 174 are disposed below the center of gravity G1 and central axis 140a of the motor unit 10. The second right vibration isolating member 172 and the third right vibration isolating member 174 are disposed above the lower end 86b of the motor 86. In the front-rear direction, the center position of the second right vibration isolating member 172 and the third right vibration isolating member 174 is substantially the same as the position of the center of gravity G1 of the motor unit 10.

[0197] The front-rear position of the first left vibration isolating member 176 (see FIG. 21) is approximately the same as the front-rear position of the first right vibration isolating member 170. The up-down position of the first left vibration isolating member 176 is approximately the same as the up-down position of the first right vibration isolating member 170. The front-rear position of the second left vibration isolating member 178 (see FIG. 21) is approximately the same as the front-rear position of the second right vibration isolating member 172. The up-down position of the second left vibration isolating member 178 is approximately the same as the up-down position of the second right vibration isolating member 172. The front-rear position of the third left vibration isolating member 180 (see FIG. 21) is approximately the same as the front-rear position of the third right vibration isolating member 174. The up-down position of the third left vibration isolating member 180 is approximately the same as the up-down position of the third right vibration isolating member 174.

[0198] (Fifth Example) In the fifth embodiment, differences from the first embodiment will be described. As shown in Fig. 37, the vibration-isolating section 94 includes only a first right vibration-isolating member 170 and a first left vibration-isolating member 176. In Fig. 37, the reference numeral 176 is attached to the outer surface of the first right vibration-isolating member 170 to make it easier to understand the position of the first left vibration-isolating member 176. The shape of the first right vibration-isolating member 170 of the fifth embodiment differs from the shape of the first right vibration-isolating member 170 of the first embodiment, and the shape of the first left vibration-isolating member 176 of the fifth embodiment differs from the shape of the first left vibration-isolating member 176 of the first embodiment.

[0199] The first right vibration isolating member 170 has a triangular ring shape. In the front-rear direction, the position of the center CP of the first right vibration isolating member 170 is substantially the same as the position of the center of gravity G1 of the motor unit 10. The center CP of the first right vibration isolating member 170 is disposed above the center of gravity G1 of the motor unit 10 and the central axis 140a of the motor shaft 140. The upper end of the first right vibration isolating member 170 is disposed above the upper end 86a of the motor 86. The lower end of the first right vibration isolating member 170 is disposed below the lower end 86b of the motor 86. At least a portion of the first right vibration isolating member 170 is disposed below the upper end 86a of the motor 86.

[0200] The shape of the first left vibration isolating member 176 is approximately the same as the shape of the first right vibration isolating member 170. The front-to-rear position of the first left vibration isolating member 176 is approximately the same as the front-to-rear position of the first right vibration isolating member 170. The up-to-down position of the first left vibration isolating member 176 is approximately the same as the up-to-down position of the first right vibration isolating member 170.

[0201] (Modification) The motor unit 10 according to one embodiment may include three or more battery attachment portions. In this case, three or more battery packs BP can be attached to the main body housing 12.

[0202] In the motor unit 10 according to one embodiment, the mounting direction D1 of the first battery pack BP1 may be different from the mounting direction of the second battery pack BP2. Also, the removal direction D2 of the first battery pack BP1 may be different from the removal direction of the second battery pack BP2.

[0203] In the motor unit 10 of the above embodiment, the first right vibration isolating member 170, the second right vibration isolating member 172, and the third right vibration isolating member 174 are fixed to the right wall 154a of the plate member 92. In a modified example, the number of vibration isolating members fixed to the right wall 154a of the plate member 92 is not limited to three, and may be two or less, or four or more.

[0204] In the motor unit 10 of the above embodiment, the first left vibration isolating member 176, the second left vibration isolating member 178, and the third left vibration isolating member 180 are fixed to the left wall 154b of the plate member 92. In a modified example, the number of vibration isolating members fixed to the left wall 154b of the plate member 92 is not limited to three, and may be two or less, or four or more. [Explanation of symbols]

[0205] 2: Work equipment 4: Unit of Work 4a: Ranma 4b: Plate compactor 4c: Slope mower 10: Motor unit 12: Main housing 14: Right body housing 16: Left body housing 18: Containment space 20: Storage section 20a: Front wall 20b: Lower wall 20c: Upper wall 20d: Back wall 20e: left wall 22: First battery mounting section 24: Second battery mounting section 26: First opening 26a: Air intake 28: Second opening 28a: Air intake 32: Base 32a:Top surface 56: Battery housing 56a: Bottom surface 56b: Left side 56c: Right side 58: Hook 60: Right battery rail 62: Left battery rail 64: Engagement part 66:Operation section 70: First battery terminal 72: Second battery terminal 74: Main power switch 84: Motor housing 86: Motor 86a: Upper end 86b: Bottom edge 88: Fan 90: Fixed unit 92: Plate material 94: Vibration isolation section 96: Right cover part 98: Left cover part 100: Support unit 102: Control unit 104: Cylindrical vibration-isolating member 108: Motor housing body 110: Front bracket 112: Rear bracket 140: Motor shaft 140a: Central axis 148: 1st fixed part 148a: 1st fixed surface 150:Second fixed part 150a: 2nd fixed surface 154: Plate body 170: First right vibration isolating member 172: Second right vibration isolating member 174: Third right vibration-proof member 176: First left vibration-proof member 178: Second left vibration-proof member 180: Third left vibration-proof member 184: Support plate 192: PCB housing 194: Filter material 196: Control circuit board 197: Circuit board case 202: Intake port 203: Substrate storage space 208: Air passage 300: Upper housing 302: Handle unit 304: Working section 320: Telescopic part 322: Land preparation department 328: Leveling plate 350: Base 352: Handle unit 354: Transmission device 356:Working department 360:Fixed base 378: Vibratory body 380: Leveling plate 400: Housing 402: Front wheel 404: Rear wheel 406: Handle unit 408:Working department 412:Fixed stand 428: Blade BP: Battery pack BP1: 1st battery pack BP2: Second battery pack D1: Installation direction D2:Removal direction G1: Center of gravity P1: Placement surface P2: Orthogonal plane

Claims

1. A motor unit that is detachably attached to a working unit and operates the working unit, a motor having a motor shaft extending in a first direction to operate the working unit; A control circuit board that operates the motor; a motor housing for supporting the motor; a main body housing disposed outside the control circuit board and the motor housing; A first fixing portion that can be fixed to the working unit; a first vibration isolation member disposed between the main body housing and the motor housing; a second vibration isolation member disposed between the main body housing and the motor housing, the first fixing portion is mountable on a mounting surface when the motor unit is mounted on the mounting surface, and is disposed substantially parallel to the motor shaft; at least a portion of the first vibration isolating member and at least a portion of the second vibration isolating member are disposed below an upper end of the motor in a vertical direction perpendicular to the mounting surface when the motor unit is placed on the mounting surface, A motor unit, wherein when the motor unit is viewed in the first direction, the motor is disposed between the first vibration-isolating member and the second vibration-isolating member.

2. the motor shaft extends along the placement surface when the motor unit is placed on the placement surface, 2. The motor unit according to claim 1, wherein the first vibration isolating member and the second vibration isolating member are disposed below a central axis of the motor shaft when the motor unit is placed on the placement surface.

3. 3. The motor unit according to claim 2, wherein the first vibration isolating member and the second vibration isolating member are disposed above a lower end of the motor when the motor unit is placed on the placement surface.

4. the first vibration-isolating member is perpendicular to the mounting surface and is spaced a first distance from an orthogonal plane including the first direction; The motor unit according to claim 2 or 3, wherein the second vibration isolation member is spaced from the orthogonal plane by the first distance.

5. 5. A motor unit according to claim 2, wherein the position of the center of gravity of the motor unit in the first direction is approximately the same as the center position of the first vibration-damping member in the first direction and the center position of the second vibration-damping member in the first direction.

6. a third vibration isolation member disposed between the main body housing and the motor housing; a fourth vibration isolation member disposed between the main body housing and the motor housing, at least a portion of the third vibration isolating member and at least a portion of the fourth vibration isolating member are disposed above a central axis of the motor shaft when the motor unit is placed on the placement surface, The motor unit according to claim 2 , wherein, when the motor unit is viewed in the first direction, the motor is disposed between the third vibration isolating member and the fourth vibration isolating member.

7. the third vibration-isolating member is orthogonal to the mounting surface and is disposed on the same side as the first vibration-isolating member with respect to an orthogonal plane including the first direction, the fourth vibration isolating member is disposed on the same side as the second vibration isolating member with respect to the orthogonal plane, 7. The motor unit according to claim 6, wherein a distance between the first vibration isolating member and the third vibration isolating member is substantially the same as a distance between the second vibration isolating member and the fourth vibration isolating member.

8. The motor further includes a plate member fixed to the motor housing. The motor unit according to claim 1 , wherein the first vibration isolating member and the second vibration isolating member are fixed to the plate member and the main body housing.

9. The motor unit according to claim 1 , further comprising a second fixing part that is fixed to the working unit of a different type from the working unit fixed to the first fixing part.

10. a fan fixed to the motor; a board housing for supporting the control circuit board; The motor housing further includes a cylindrical vibration-isolating member disposed between the motor housing and the board housing, the cylindrical vibration-isolating member having a cylindrical shape, 10. The motor unit according to claim 1, wherein when the fan rotates, air cools the control circuit board and passes through an inside of the cylindrical vibration-isolating member.

11. The main body housing includes: a first battery mounting portion to which a first battery that supplies power to the motor is detachably mounted; The motor unit according to claim 1 , further comprising: a second battery attachment portion to which a second battery that supplies power to the motor is detachably attached.

12. The motor unit according to claim 1 , wherein the control circuit board at least partially overlaps the motor when the motor unit is viewed in the first direction.

13. A motor unit that is detachably attached to a working unit and operates the working unit, a motor having a motor shaft extending in a first direction to operate the working unit; A control circuit board that operates the motor; a motor housing for supporting the motor; a main body housing disposed outside the control circuit board and the motor housing; A second fixing portion fixed to the working unit; a first vibration isolation member disposed between the main body housing and the motor housing; a second vibration isolation member disposed between the main body housing and the motor housing, the motor shaft is substantially perpendicular to the second fixed portion, at least a portion of the first vibration isolating member and at least a portion of the second vibration isolating member are disposed below an upper end of the motor in a vertical direction perpendicular to the mounting surface when the motor unit is mounted on a mounting surface, A motor unit, wherein when the motor unit is viewed in the first direction, the motor is disposed between the first vibration-isolating member and the second vibration-isolating member.

14. the motor shaft extends along the placement surface when the motor unit is placed on the placement surface, 14. The motor unit according to claim 13, wherein the first vibration isolating member and the second vibration isolating member are disposed below a central axis of the motor shaft when the motor unit is placed on the placement surface.

15. the first vibration-isolating member is perpendicular to the mounting surface and is spaced a first distance from an orthogonal plane including the first direction; The motor unit of claim 14 , wherein the second vibration isolation member is spaced the first distance from the orthogonal plane.

16. The main body housing includes: a first battery mounting portion to which a first battery that supplies power to the motor is detachably mounted; The motor unit according to any one of claims 13 to 15, further comprising: a second battery attachment portion to which a second battery that supplies power to the motor is detachably attached.

17. A motor unit that is detachably attached to a working unit and operates the working unit, a motor having a motor shaft extending in a first direction to operate the working unit; A control circuit board that operates the motor; a fan fixed to the motor; a motor housing for supporting the motor; a board housing for supporting the control circuit board; a main body housing disposed outside the motor housing and the board housing; a fixing unit fixed to the working unit; a cylindrical vibration-isolating member disposed between the motor housing and the board housing, the cylindrical vibration-isolating member having a cylindrical shape, When the fan rotates, air cools the control circuit board and passes through the inside of the cylindrical vibration-isolating member.

18. a plate member fixed to the motor housing; A support unit that supports the substrate housing; The motor unit according to claim 17 , further comprising a vibration isolating member fixed to the plate member and the support unit.

19. 19. The motor unit according to claim 17, wherein the cylindrical vibration-damping member at least partially overlaps the motor when the motor unit is viewed in the first direction.

20. The main body housing includes: a first battery mounting portion to which a first battery that supplies power to the motor is detachably mounted; The motor unit according to any one of claims 17 to 19, further comprising: a second battery attachment portion to which a second battery that supplies power to the motor is detachably attached.

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