Patent Publication Number: US-2021184535-A1

Title: Electric power unit and working machine

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of International Patent Application No. PCT/JP2018/032632 filed on Sep. 3, 2018, the entire disclosures of which are incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to an electric power unit, and a working machine. 
     Description of the Related Art 
     Japanese Utility Model Laid-Open No. 7-42367 discloses a plate compactor using an engine as a drive source. 
     In recent years, with rise of exhaust gas regulations, environmental regulations and the like, there has been a growing need for using an electric power unit as a drive source, in a construction machine such as a plate compactor, and a working machine such as a lawn mower. Such an electric power unit is preferably mountable on various types of working machines, and there is a demand for compactness and enhanced versatility. 
     Therefore, an object of the present invention is to provide an electric power unit, which makes it possible to provide compactness and enhanced versatility. 
     SUMMARY OF THE INVENTION 
     According to the present invention, there is provided an electric power unit that is mounted on a mounting object, comprising a motor; and electrical equipment for driving the motor, wherein the motor has a first attachment portion that is attached to the mounting object, and a second attachment portion to which the electrical equipment is attached. 
     Further features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings). 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing a configuration example of a working machine. 
         FIG. 2A  is an external view (perspective view) of an electric power unit. 
         FIG. 2B  is an external view (perspective view) of the electric power unit. 
         FIG. 2C  is an external view (view seen from a front) of the electric power unit. 
         FIG. 2D  is an external view (view seen from a rear) of the electric power unit. 
         FIG. 2E  is an external view (view seen from a side) of the electric power unit. 
         FIG. 3  is an exploded view of the electric power unit. 
         FIG. 4A  is a view showing a motor mounted on a base. 
         FIG. 4B  is a view showing the motor mounted on the base. 
         FIG. 5A  is a view showing the electric power unit in a state where a cover is removed. 
         FIG. 5B  is a view showing a schematic disposition example of the motor, a battery, and a control unit. 
         FIG. 6  is a view showing a schematic disposition example (modified example) of the motor, the battery, and the control unit. 
         FIG. 7  is a view showing a schematic disposition example (modified example) of the motor, the battery, and the control unit. 
         FIG. 8  is a sectional view of the motor. 
         FIG. 9  is a view showing a schematic disposition example (modified example) of the motor, the battery, and the control unit. 
         FIG. 10A  is a view showing a schematic disposition example (modified example) of the motor, the battery, and the control unit. 
         FIG. 10B  is a view showing a schematic disposition example (modified example) of the motor, the battery, and the control unit. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described. Note that the respective drawings are schematic views showing structures and configurations of the embodiments, and sizes of the respective members which are illustrated do not always reflect real sizes. Further, the same elements are assigned with identical reference signs in the respective drawings, and explanation on redundant contents in the present description will be omitted. 
     First Embodiment 
     A working machine  1  of an embodiment according to the present invention will be described.  FIG. 1  is a view showing a configuration example of the working machine  1  of the present embodiment. The working machine  1  of the present embodiment is a working machine (electric working machine) including an electric power unit  10  having a motor  11  and electrical equipment  12  that drives the motor  11 . While examples of the working machine  1  include a plate compactor, a rammer, a lawn mower, a tiller, a snowplow, and the like, explanation hereinafter will be made with a plate compactor as an example. The working machine  1  includes, for example, the electric power unit  10 , a working unit  20  (working mechanism), a power transmission mechanism  30 , and an operation handle  40 . 
     The electric power unit  10  has the motor  11 , and the electrical equipment  12  that drives the motor  11 . The electrical equipment  12  can include, for example, a battery  121 , and a control unit  122  that uses electric power of the battery  121  to control the motor  11  to be driven. The control unit  122  is a PDU (power drive unit) in the present embodiment, but may be configured to include a processor represented by a CPU, a storage device such as a semiconductor memory, an interface with an external device, and the like. A specific configuration of the electric power unit  10  will be described later. 
     The working unit  20  (working mechanism) is a unit for carrying out predetermined work, and is a main body unit of the working machine  1 . The working unit  20  of the present embodiment is a unit that carries out rolling compaction work to solidify the ground, and can include the base  21  that is an object (mounting object) on which the electric power unit  10  is mounted, and a rolling compaction plate  22  that is provided under the base  21 . The rolling compaction plate  22  is a plate in contact with the ground, and is configured to be movable up and down. 
     The power transmission mechanism  30  is a mechanism that converts rotational power generated by the electric power unit  10  (motor  11 ) into power for moving the rolling compaction plate  22  up and down to transmit the power to the working unit  20 . The power of the electric power unit  10  is transmitted to the working unit  20  (rolling compaction plate  22 ) by the power transmission mechanism  30 , and thereby rolling compaction work of moving the rolling compaction plate  22  up and down, and solidifying the ground can be performed. Further, the operation handle  40  is formed in a bar shape so that a user can grasp the operation handle  40  in a standing position. Thereby, the user can perform rolling compaction work while pushing the working machine  1  via the operation handle  40 . 
     [Configuration Example of Electric Power Unit] 
     Next, a configuration example of the electric power unit  10  of the present embodiment will be described. In recent years, there has been a growing need for using the electric power unit  10  having the motor  11  as the drive source, in a working machine, so that compactness and enhanced versatility of the electric power unit  10  are required so that the electric power unit  10  can be mounted on various types of working machines. Accordingly, the electric power unit  10  of the present embodiment is configured such that only the motor  11  is attached to the base  21  (mounting object), and the electrical equipment  12  is mounted to the motor  11 . Specifically, the motor  11  is provided with a first attachment portion  11   a  that is attached to the base  21  (mounting object), and a second attachment portion  11   b  to which the electrical equipment  12  is attached. 
     The configuration described above enables the motor  11  and the electrical equipment  12  to be attached to and detached from the base  21  in a state where the motor  11  and the electrical equipment  12  are integrated, so that it becomes unnecessary to change the shape or the like of the electrical equipment  12  in accordance with a shape of an attachment portion which is provided at the base  21 , and newly provide an attachment portion for attaching the electrical equipment  12 , for the base  21 , and enhancement of versatility of the electric power unit  10  can be realized. Further, the motor  11  and the electrical equipment  12  can be integrated without considering attachment of the electrical equipment  12  onto the base  21 , so that compactness of the electric power unit  10  can be also realized. 
     Hereinafter, a specific configuration example of the electric power unit  10  of the present embodiment will be described with reference to the drawings. Note that in the drawing shown below, directions that are orthogonal to each other on a surface parallel with a horizontal direction are taken as an X-direction and a Y-direction, and a direction parallel with the vertical direction is taken as a Z-direction. 
       FIG. 2A  to  FIG. 2E  are external views of the electric power unit  10  of the present embodiment.  FIG. 2A  and  FIG. 2B  show perspective views of the electric power unit  10 ,  FIG. 2C  shows a view of the electric power unit  10  seen from a front (+X-direction side),  FIG. 2D  shows a view of the electric power unit  10  seen from a rear (−X-direction side), and  FIG. 2E  shows a view of the electric power unit  10  seen from a side (−Y-direction side). As shown in  FIG. 2A  to  FIG. 2E , the electric power unit  10  of the present embodiment is configured such that in order to prevent water from an outside for example, the electrical equipment  12  (a battery  121 , a control unit  122 ) is covered with a cover  13 , and the motor  11  is attached to a plurality (two in the present embodiment) of attachment receiving portions  21   a  provided at the base  21  (mounting object). 
     Here, the cover  13  of the present embodiment can be made up of a plurality of cover components  13   a  to  13   e , as is understandable from  FIG. 3  shown below. The cover component  13   a  (housing) is configured to cover the battery  121 . A cover component  13   b  is configured to cover a +X-direction side of the motor  11  and the control unit  122 , and a cover component  13   c  is configured to cover a −X-direction side of the motor  11  and the control unit  122 . A cover component  13   d  is configured to be attached to a −Y-direction side of the cover components  13   b  and  13   c  when the cover components  13   b  and  13   c  are integrated. Further, the cover component  13   e  is attached to the cover component  13   b  so as to cover a gas intake port of a cooling fan of the motor  11 . 
       FIG. 3  is an exploded view of the electric power unit  10  of the present embodiment, and shows a view of the electric power unit  10  seen from the same direction as in  FIG. 2A . As described above, the electric power unit  10  can include the motor  11  and the electrical equipment  12  (the battery  121 , the control unit  122  (PDU)). The motor  11  is provided with a first attachment portion  11   a  that is attached to an attachment receiving portion  21   a  of the base  21 , and a second attachment portion  11   b  to which the electrical equipment  12  is attached. In the present embodiment, the first attachment portions  11   a  are provided at two locations on a bottom side of the motor  11 , and the second attachment portions  11   b  are provided at two locations on a top side of the motor  11 .  FIG. 2  illustrates a battery unit of a configuration in which the battery  121  is housed in the cover  13   a  (housing), and hereinafter, the battery unit may be simply referred to as the battery  121 . 
     The motor  11  is directly attached (fixed) to the base  21  by attaching the first attachment portions  11   a  which is provided at the bottom side to the attachment receiving portions  21   a  of the base  21  with screws or the like. That is to say, the motor  11  is rigidly coupled with the base  21 .  FIG. 4A  and  FIG. 4B  are views each showing the motor  11  that is attached to the base  21 .  FIG. 4A  is a perspective view from a direction in which the first attachment portion  11   a  at a −Y-direction side is visible, of the plurality of first attachment portions  11   a  provided at the motor  11 , and  FIG. 4B  is a perspective view from a direction in which the first attachment portion  11   a  at a +Y-direction side is visible. Further, the first attachment portion  11   a  can be directly attached to the attachment receiving portion  21   a  of the base  21  with a screw or the like without an aid of a vibration isolation mechanism such as an elastic member (for example, rubber) as shown in  FIG. 4A  and  FIG. 4B , so that a relative position of the motor  11  (a shaft unit  11   c ) and the working unit  20  that are connected to each other by the power transmission mechanism  30  does not vary. 
     The electrical equipment  12  is attached to the second attachment portion  11   b  of the motor  11  with a screw or the like via the vibration isolation mechanism  14  to be separated (apart, isolated) from the base  21  so as not to connect to (contact, be coupled with) the base  21 . That is to say, in the electric power unit  10  of the present embodiment, only the motor  11  is attached to the base  21 , and the electrical equipment  12  is only attached to the motor  11  but is not directly attached to the base  21 . 
     Here, though not illustrated, the motor  11  and the electrical equipment  12  (the battery  121 , the control unit  122 ) are connected by a cable for transmitting a control signal from the control unit  122 , and transferring electric power of the battery  121 . Further, the battery  121  and the control unit  122  as the electrical equipment  12  are also connected by the cable for transmitting a control signal from the control unit  122 , and transferring the electric power of the battery  121 . 
     The vibration isolation mechanism  14  includes a support member  140  that supports the electrical equipment  12  swingably to the motor  11  so as to suppress vibration generated in the working unit  20  (the base  21 ) and the motor  11  from being transmitted to the electrical equipment  12 . The support member  140  can include a frame  141  to which the electrical equipment  12  is fixed, and an elastic member  142 , for example. To the frame  141 , the battery  121  and the control unit  122  as the electrical equipment  12  are fixed with screws or the like. Further, in the frame  141 , a portion to be attached that is attached to the second attachment portion  11   b  of the motor  11  is formed, and the portion to be attached is attached to the second attachment portion  11   b  of the motor  11  via the elastic member  142 , whereby the electrical equipment  12  is attached to the motor  11 . The elastic member  142  is a member that is disposed between the portion to be attached of the frame  141  and the second attachment portion  11   b  of the motor  11  when the portion to be attached of the frame  141  is attached to the second attachment portion  11   b  of the motor  11 , and can be formed of, for example, a rubber, gum, or the like. 
     [Disposition Example of Respective Components of Electric Power Unit] 
     Next, disposition of the motor  11 , the battery  121 , and the control unit  122  in the electric power unit  10  will be described.  FIG. 5A  and  FIG. 5B  are views each showing a disposition example of the motor  11 , the battery  121 , and the control unit  122  in the electric power unit  10 .  FIG. 5A  shows a state where the cover  13  of the electric power unit shown in  FIG. 2C  is removed, and  FIG. 5B  shows a schematic disposition example of the motor  11 , the battery  121 , and the control unit  122 . 
     As shown in  FIG. 5A  and  FIG. 5B , the motor  11  is fixed to (rigidly coupled with) the base  21  by the first attachment portions  11   a  of the motor  11  being attached to the attachment receiving portions  21   a  of the base  21  with screws or the like. Further, the support member  140  for supporting the electrical equipment  12  is attached to the motor  11 . Specifically, the support member  140  has the frame  141  and the elastic member  142  as described above, and the portion to be attached of the frame  141  is attached to the second attachment portion  11   b  of the motor  11  via the elastic member  142 . In the example shown in  FIG. 5A  and  FIG. 5B , the support member  140  is attached to the motor  11  in the attachment portions at three locations, and the first attachment portion  11   a  on the −Y-direction side of the plurality of first attachment portions  11   a  provided at the motor  11  also has a function as the second attachment portion  11   b.    
     The battery  121  as the electrical equipment  12  is disposed above the motor  11 , and is attached to the frame  141  by a screw or the like to be fixed. That is to say, the battery  121  is attached to an upper portion of the motor  11  via the support member  140 . The control unit  122  as the electrical equipment  12  is disposed at a side portion of the motor  11 , and is attached to the frame  141  by a screw or the like to be fixed. That is to say, the control unit  122  is attached to the side portion of the motor  11  via the support member  140 . Further, a side portion of the motor  11  on an opposite side from the side portion to which the control unit  122  is attached is preferably exposed with nothing disposed on the side portion, from a viewpoint of cooling (air cooling) of the motor  11 . 
     The electric power unit  10  of the present embodiment is configured such that of the battery  121  and the control unit  122  as the electrical equipment  12 , the battery  121  which is a heavier component is attached to the upper portion of the motor  11 , and the control unit  122  which is a lighter component is attached to the side portion of the motor  11 . According to the configuration described above, in the horizontal direction (for example, the Y-direction), the center of gravity in the entire electric power unit  10  can be brought close to the shaft unit  11   c  (rotating shaft) of the motor  11 , so that shake of the electric power unit  10  while working with the working machine  1  is prevented, and working stability can be enhanced. However, other than the configuration described above, such a configuration that the battery  121  is attached to the side portion of the motor  11 , and the control unit  122  is attached to the upper portion of the motor  11  as shown in  FIG. 6  may be adopted as long as working stability can be ensured. 
     Further, in the support member  140  of the present embodiment, the frame  141  is configured to be in an L-shape to fix both the battery  121  and the control unit  122 , but the support member  140  is not limited to this. For example, a frame (a support member) may be individually provided for each of the battery  121  and the control unit  122 . For example, as shown in  FIG. 7 , a frame  141   a  (support member  140   a ) for fixing the battery  121 , and a frame  141   b  (support member  140   b ) for fixing the control unit  122  may be provided separately. In this case, the respective frames  141   a  and  141   b  are also attached to the second attachment portions  11   b  of the motor  11  via the elastic members  142 .  FIG. 7  is a view showing a modified example of the electric power unit  10  of the present embodiment. 
     Here, in each of the battery  121  and the control unit  122  as the electrical equipment  12 , a shape of an attached surface to the motor  11  (support member  140 ) can be formed in a substantially rectangle. In this case, the battery  121  can be disposed such that a longitudinal direction of the battery  121  is along an arranging direction (predetermined direction) of a plurality of second attachment portions  11   b  that are provided at the motor  11  to attach the battery  121 . Specifically, the battery  121  can be disposed such that the longitudinal direction of the battery  121  is along the arranging direction (Y-direction) of the two second attachment portions  11   b  which are provided at the upper portion of the motor  11  to attach the battery  121 . 
     Further, the control unit  122  can be disposed such that a longitudinal direction of the control unit  122  is along an arranging direction (predetermined direction) of a plurality of second attachment portions  11   b  that are provided at the motor  11  to attach the control unit  122 . Specifically, the control unit  122  can be disposed such that the longitudinal direction of the control unit  122  is along the arranging direction (Z-direction) of the two second attachment portions  11   b  which are provided at the side portion of the motor  11  to attach the control unit  122 . By disposing the electrical equipment  12  (the battery  121 , the control unit  122 ) in this way, it becomes possible to make the electric power unit  10  more compact. 
     [Cooling Configuration of Electric Power Unit] 
     In the electric power unit  10  of the present embodiment, the motor  11  (for example, a stator coil) generates heat, so that as shown in  FIG. 3  and  FIG. 4A , for example, a cooling fan  11   d  for cooling the motor is provided at the shaft unit  11   c  of the motor  11 . Thereby, the cooling fan  11   d  rotates with drive of the motor  11 , and takes in gas (air) to an inside of the motor  11  from an outside as shown by an arrow R in  FIG. 3 , and can cool (air-cool) the motor  11 . 
     In the electric power unit  10 , the electrical equipment  12  (the battery  121 , the control unit  122 ) can also generate heat in addition to the motor  11 , so that it is necessary to cool the electrical equipment  12  (in particular, the control unit  122 ). If a mechanism (cooling fan) for cooling the electrical equipment  12  is separately provided from the cooling fan  11   d  provided at the motor  11  in this case, it can be disadvantageous in terms of device cost (manufacture cost) and compactness. Consequently, the motor  11  of the present embodiment can include a blowout port  11   e  that blows the gas from the cooling fan  11   d  to an electrical equipment  12  side. 
       FIG. 8  is a sectional view of the motor  11 . As shown in  FIG. 8 , the motor can include the shaft unit  11   c , a stator coil  11   g  disposed around the shaft unit  11   c , and the cooling fan  11   d  provided at the shaft unit  11   c . When the shaft unit  11   c  is rotated by energizing the stator coil  11   g  in the motor  11 , the cooling fan  11   d  rotates with this, and the stator coil  11   g  can be cooled by applying the air taken in from outside to the stator coil  11   g  as shown by the arrow R. Further, as shown in  FIG. 3  and  FIG. 8 , the motor  11  is configured to blow out a part of the gas that is taken in from outside by the cooling fan  11   d  to the electrical equipment  12  side from the blowout port  11   e  provided in the motor  11 . In the present embodiment, the blowout port  11   e  of the motor  11  can be configured such that the gas is blown out to the control unit  122  as the electrical equipment  12 . 
     As shown in  FIG. 3  and  FIG. 5A , the control unit  122  has a heat sink  122   a  configure by a plurality of fins, and is disposed in such a manner that the heat sink  122   a  is disposed on the motor  11  side. Thereby, the gas that is blown out from the blowout port  11   e  of the motor  11  passes among the fins of the heat sink  122   a , and can efficiently cool the control unit  122 . The gas passing among the fins of the heat sink  122   a  is discharged to outside from an opening  13   f  that is provided at the −X-direction side of the cover  13  (the cover components  13   c  and  13   d ) as shown in  FIG. 2D . Here, in the present embodiment, the blowout port  11   e  of the motor  11  is configured to blow out the gas to the control unit  122 , but the blowout port is not limited to this, and may be configured to blow out the gas to the battery  121 , or to both the battery  121  and the control unit  122 . 
     Second Embodiment 
     A second embodiment according to the present invention will be described. In the first embodiment, the electric power unit  10  in which the shaft unit  11   c  (rotating shaft) of the motor  11  is parallel with the horizontal direction is described, but as shown in  FIG. 9 , the shaft unit  11   c  (rotating shaft) of the motor  11  may be made parallel with the vertical direction. In this case, the motor  11  is provided with the first attachment portions  11   a  that are attached to the base  21  (mounting object), and the second attachment portions  11   b  to which the electrical equipment  12  is attached. Only the motor  11  is attached to the base  21  (the mounting object) by the first attachment portions  11   a , and the electrical equipment  12  is attached to the motor  11  by the second attachment portions  11   b.    
     Third Embodiment 
     A third embodiment according to the present invention will be described. The electric power unit  10  is preferably configured such that of the motor  11  and the battery  121 , a heavier one is attached to the base  21  (mounting object), and the lighter one is attached to the upper portion or the side portion of the heavier member. By configuring the electric power unit  10  in this way, the center of gravity of the electric power unit  10  is lowered, shake of the electric power unit  10  while working with the working machine  1  is prevented, and working stability can be enhanced. 
     The case where the motor  11  is heavier than the battery  121  is as described in the first embodiment and the second embodiment. Therefore, hereinafter, a configuration of the electric power unit  10  in a case where the battery  121  is heavier than the motor  11  will be described. Note that the configuration of the present embodiment basically takes over the configuration of the first embodiment other than disposition of the motor  11  and the battery  121 , so that explanation of components and configurations similar to those of the first embodiment will be omitted. 
       FIG. 10A  and  FIG. 10B  are views each showing a schematic disposition example of the motor  11 , the battery  121 , and the control unit  122  in the case where the battery  121  is heavier than the motor  11 . In the disposition example shown in  FIG. 10A , the motor  11  is attached to an upper portion of the battery  121 , and the control unit  122  is attached to a side portion of the battery  121 . On the other hand, in the disposition example shown in  FIG. 10B , the motor  11  is attached to the side portion of the battery  121 , and the control unit  122  is attached to the upper portion of the battery  121 . In either of the disposition examples, only the battery  121  is attached to the base  21  (mounting object), and the motor  11  and the control unit  122  are attached to the battery  121 . That is, in the present embodiment, the battery  121  has attachment portions  121   a  which are attached to the base  21 , attachment portions  121   b  to which the motor  11  is attached, and attachment portions  121   c  to which the control unit  122  is attached. 
     Here, the examples shown in  FIG. 10A  and  FIG. 10B  each have the configuration in which the control unit  122  is attached to the battery  121 , but the present invention may adopt a configuration in which the control unit  122  is attached to the motor  11  instead of the battery  121 . Further, though not shown in  FIG. 10A  and  FIG. 10B , the motor  11  and the control unit  122  may be attached to the battery  121  via a support member. The support member can include frames that fix the motor  11  and the control unit  122 , and elastic members formed of a rubber, gum or the like. 
     Summary of Embodiments 
     The electric power unit of the above described embodiments is an electric power unit (for example,  10 ) that is mounted on a mounting object (for example,  21 ), and includes a motor (for example,  11 ), and electrical equipment (for example,  12 ) for driving the motor, and the motor has a first attachment portion (for example,  11   a ) that is attached to the mounting object, and a second attachment portion (for example,  11   b ) to which the electrical equipment is attached. According to the mode described above, the motor and the electrical equipment are attachable to and detachable from various mounting objects different in shape (for example, a working machine main body) in the state where the motor and the electrical equipment are integrated, so that enhancement in versatility of the electric power unit can be realized. Further, the motor and the electrical equipment can be integrated without considering attachment of the electrical equipment to the mounting object, so that compactness of the electric power unit can be also realized. 
     Further, the electrical equipment is attached to the second attachment portion of the motor to be separated from the mounting object. According to the mode described above, it is possible to attach and detach the motor and the electrical equipment to and from the mounting object in the state where the motor and the electrical equipment are integrated, without considering attachment of the electrical equipment to the mounting object, so that versatility in the electric power unit can be enhanced. 
     Further, the electrical equipment is not directly attached to the mounting object. According to the mode described above, it becomes possible to attach and detach the motor and the electrical equipment to and from the mounting object in the state where the motor and the electrical equipment are integrated without considering attachment of the electrical equipment to the mounting object, so that versatility of the electric power unit can be enhanced. 
     Further, the electrical equipment is attached to the second attachment portion of the motor via a vibration isolation mechanism (for example,  14 ). According to the mode described above, it is possible to reduce the influence of vibration of the motor and the mounting object (for example, a working machine main body) exerted on the electrical equipment. 
     Further, the vibration isolation mechanism includes a support member (for example,  140 ) that supports the electrical equipment swingably to the motor. According to the mode described above, it becomes possible to reduce vibration that is transmitted to the electrical equipment from the motor and the mounting object (for example, the working machine main body). 
     Further, the support member includes a frame (for example,  141 ) to which the electrical equipment is fixed, and an elastic member (for example,  142 ) that is disposed between the frame and the second attachment portion. According to the mode described above, it becomes possible to reduce vibration that is transmitted to the electrical equipment from the motor and the mounting object (for example, the working machine main body) with the simple configuration. 
     Further, the support member is provided only with respect to a surface of the motor on which the electrical equipment is disposed. According to the mode described above, it becomes possible to achieve reduction in weight of the electric power unit without hindering heat radiation from the motor. 
     Further, the electrical equipment includes a battery (for example,  121 ), and a control unit (for example,  122 ) that controls the motor, and the support member is individually provided for each of the battery and the control unit. By the mode described above, it becomes possible to reduce the vibration that is transmitted to each of the battery and the control unit from the motor and the mounting object (for example, the working machine main body) more effectively. 
     Further, the electrical equipment includes a battery (for example,  121 ), and a control unit (for example,  122 ) that controls the motor, the battery is attached to an upper portion of the motor, and the control unit is attached to a side portion of the motor. According to the mode described above, it becomes possible to prevent shake of the electric power unit during driving by bringing the center of gravity of the entire electric power unit close to the shaft unit (rotating shaft) of the motor, in the horizontal direction. Further, it becomes possible to make the electric power unit more compact in accordance with shapes of the battery and the control unit. 
     Further, the electrical equipment includes a battery (for example,  121 ), and a control unit (for example,  122 ) that controls the motor, the battery is attached to the side portion of the motor, and the control unit is attached to the upper portion of the motor. According to the mode described above, it becomes possible to make the electric power unit more compact in accordance with the shapes of the battery and the control unit. 
     Further, the motor has a plurality of the second attachment portions that are arranged along a predetermined direction, and the electrical equipment is disposed such that a longitudinal direction of the electrical equipment is along the predetermined direction. According to the mode described above, it becomes possible to make the electric power unit more compact in accordance with the shapes of the battery and the control unit. 
     Further, the motor includes a cooling fan (for example,  11   d ) that is provided at a shaft unit (for example,  11   c ) to cool the motor, and a blowout port (for example,  11   e ) that blows out gas from the cooling fan to the electrical equipment side. According to the mode described above, it becomes possible to efficiently cool the electrical equipment by the cooling fan provided at the motor without additionally providing a mechanism that cools the electrical equipment. 
     The electric power unit (for example,  10 ) of the above described embodiment includes a motor (for example,  11 ) and a battery (for example,  121 ), and a lighter member of the motor and the battery is attached to an upper portion or a side portion of a heavier member of the motor and the battery. According to the mode described above, it is possible to lower the center of gravity of the entire electric power unit, and prevent shake of the electric power unit during drive. 
     Further, a control unit (for example,  122 ) that controls the motor is further included, and the control unit is attached to the side portion of the heavier member in a case where the lighter member is attached to the upper portion of the heavier member, and is attached to the upper portion of the heavier member in a case where the lighter member is attached to the side portion of the heavier member. According to the mode described above, it is possible to integrate the control unit with the motor and the battery, and it is also possible to realize compactness of the electric power unit. 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.