Patent Publication Number: US-2022224047-A1

Title: Power transmission device and electric power device

Description:
TECHNICAL FIELD 
     The present invention relates to a motive power transmission device that transmits motive power and an electric power device in which the motive power transmission device is disposed. 
     BACKGROUND ART 
     JP 6286084 B1 discloses that a connector of a mobile battery and a connector of a connector holder in a housing are connected to each other. 
     JP 2019-068552 A discloses a structure in which a charging plug in a containment chamber is inserted into a plug outlet of a rechargeable battery. 
     SUMMARY OF INVENTION 
     In the techniques disclosed in JP 6286084 B1 and JP 2019-068552 A, when an unexpected high-speed battery motion occurs, excessive external force may be applied to a connector or a charging plug. 
     The present invention has been devised in order to solve the problems discussed above, and has the object of providing a motive power transmission device and an electric power device that can suppress transmission of excessive external force. 
     A motive power transmission device according to a first aspect of the present invention includes a first member, a second member, and a third member that are movable relatively to each other and mechanically connected so as to transmit motive power to each other, and the motive power transmission device includes a first elastic member disposed on a first motive power transmission path that is a motive power transmission path between the first member and the second member, a second elastic member disposed on a second motive power transmission path that is a motive power transmission path between the first member and the third member, and a buffer member disposed on a third motive power transmission path that is a motive power transmission path between the second member and the third member. 
     In an electric power device according to a second aspect of the present invention, a motive power transmission device having a first member, a second member, and a third member that are movable relatively to each other and mechanically connected so as to transmit motive power to each other, is arranged, and the electric power device includes a first elastic member disposed on a first motive power transmission path that is a motive power transmission path between the first member and the second member, a second elastic member disposed on a second motive power transmission path that is a motive power transmission path between the first member and the third member, and a buffer member disposed on a third motive power transmission path that is a motive power transmission path between the second member and the third member, wherein the first member includes an input portion to which a force is input from outside of the motive power transmission device, and the second member includes an output portion configured to output a force to the outside of the motive power transmission device. 
     The input portion is disposed in a manner that the force is input from an electric energy storage device which is attachable to and detachable from the electric power device, and the output portion is disposed in a manner that the force is output to a terminal of the electric power device which is connected to a terminal of the electric energy storage device. 
     According to the present invention, it is possible to suppress transmission of excessive external force. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a charging power supply device according to an embodiment; 
         FIG. 2  shows a model of a rectangular parallelepiped corresponding to a casing of the charging power supply device according to an embodiment; 
         FIG. 3  is a perspective view of the charging power supply device according to an embodiment; 
         FIG. 4  is a perspective view of the charging power supply device according to an embodiment; 
         FIGS. 5A, 5B, 5C, 5D, 5E and 5F  are six orthogonal views of the charging power supply device according to an embodiment; 
         FIG. 6  is a cross-sectional view of the charging power supply device according to an embodiment; 
         FIG. 7  is a cross-sectional perspective view of the charging power supply device according to an embodiment; 
         FIG. 8  is a cross-sectional view of a portion of the charging power supply device according to an embodiment; 
         FIG. 9  is a cross-sectional view of a portion of the charging power supply device according to an embodiment; 
         FIG. 10  shows members included on the bottom surface side of the casing; 
         FIGS. 11A, 11B and 11C  conceptually show the flow of water; 
         FIGS. 12 and 12B  show the charging power supply device according to an embodiment; 
         FIGS. 13A, 13B, 13C, 13D, 13E and 13F  show six orthogonal views of the charging power supply device according to an embodiment; 
         FIG. 14  is a cross-sectional view of a portion of the charging power supply device according to an embodiment; 
         FIG. 15  shows a state in which the casing is inclined; 
         FIG. 16  shows an example of a case of transporting the charging power supply device according to an embodiment; 
         FIG. 17  shows an example of a case of transporting the charging power supply device according to an embodiment; 
         FIG. 18  shows an example of a case of transporting the charging power supply device according to an embodiment; 
         FIG. 19  shows an example of inserting or removing a battery into and from a containment chamber; 
         FIG. 20  shows an example of inserting the battery into the containment chamber; 
         FIG. 21  shows an example of inserting the battery into the containment chamber; 
         FIG. 22  is a perspective view showing a motive power transmission device according to an embodiment; 
         FIG. 23  is a top view showing the motive power transmission device according to an embodiment; 
         FIG. 24  is a side view showing the motive power transmission device according to an embodiment; 
         FIG. 25  is a side view showing the motive power transmission device according to an embodiment; 
         FIG. 26  is a cross-sectional view showing the motive power transmission device according to an embodiment; 
         FIG. 27  is a cross-sectional perspective view showing the motive power transmission device according to a modification; 
         FIGS. 28A and 28B  are schematic diagrams of the motive power transmission device; 
         FIGS. 29A and 29B  are schematic diagrams of the motive power transmission device; 
         FIGS. 30A, 30B, 30C and 30D  are dynamic equivalent models of the motive power transmission device; 
         FIG. 31  is a cross-sectional view of a connector unit; and 
         FIGS. 32A, 32B, 32C, 32D and 32E  are dynamic equivalent models of the connector unit. 
     
    
    
     DESCRIPTION OF THE INVENTION 
     Preferred embodiments of a motive power transmission device according to the present invention will be described in detail below with reference to the accompanying drawings. 
     Embodiment 
     A charging power supply device according to one embodiment will be described using drawings.  FIG. 1  is a perspective view of the charging power supply device according to an embodiment. 
     As shown in  FIG. 1 , a charging power supply device  10  includes a casing  12 . The shape of the casing  12  is substantially polyhedral. More specifically, the shape of the casing  12  is substantially a rectangular parallelepiped. As shown in  FIG. 1 , each vertex and each edge of the casing  12  are filleted. That is, each vertex and each edge of the casing  12  is made to have a rounded shape. The charging power supply device  10  corresponds to a power device of the present invention. 
       FIG. 2  shows a model of a rectangular parallelepiped corresponding to a casing of the charging power supply device according to the present embodiment. As shown in  FIG. 2 , a rectangular parallelepiped  23  corresponding to the casing  12  includes a bottom surface (floor surface)  18 A, a top surface  18 B, a left-side surface (side surface)  18 C, a right-side surface (side surface)  18 D, a front surface (front-side surface, side surface)  18 E, and a rear surface (rear-side surface, side surface)  18 F. The reference numeral  18  is used when describing a surface in general, and the reference numerals  18 A to  18 F are used when describing each individual surface. 
     The left-side surface  18 C, the right-side surface  18 D, the front surface  18 E, and the rear surface  18 F are bent from and continuous with the bottom surface  18 A. Furthermore, the left-side surface  18 C, the right-side surface  18 D, the front surface  18 E, and the rear surface  18 F are bent from and continuous with the top surface  18 B. The bottom surface  18 A and the top surface  18 B are aligned with each other. That is, the bottom surface  18 A and the top surface  18 B are parallel to each other. In other words, the normal direction of the bottom surface  18 A and the normal direction of the top surface  18 B are aligned with each other. The left-side surface  18 C and the right-side surface  18 D are aligned with each other. In other words, the normal direction of the left-side surface  18 C and the normal direction of the right-side surface  18 D are aligned with each other. The front surface  18 E and the rear surface  18 F are aligned with each other. In other words, the normal direction of the front surface  18 E and the normal direction of the rear surface  18 F are aligned with each other. 
     The direction from the left-side surface  18 C toward the right-side surface  18 D or the direction from the right-side surface  18 D to the left-side surface  18 C is a width direction (X direction). The direction from the front surface  18 E toward the rear surface  18 F or the direction from the rear surface  18 F toward the front surface  18 E is a depth direction (Y direction). The direction from the bottom surface  18 A toward the top surface  18 B or the direction from the top surface  18 B toward the bottom surface  18 A is a height direction (Z direction). 
     The rectangular parallelepiped  23  corresponding to the casing  12  has twelve edges  20 A to  20 L. The edge  20 A is positioned at the region (portion, location) where the top surface  18 B and the rear surface  18 F intersect. The edge  20 B is positioned at the region where the top surface  18 B and the front surface  18 E intersect. The edge  20 C is positioned at the region where the bottom surface  18 A and the front surface  18 E intersect. The edge  20 D is positioned at the region where the bottom surface  18 A and the rear surface  18 F intersect. The edges  20 A to  20 D are aligned with each other. 
     The edge  20 E is positioned at the region where the top surface  18 B and the left-side surface  18 C intersect. The edge  20 F is positioned at the region where the bottom surface  18 A and the left-side surface  18 C intersect. The edge  20 G is positioned at the region where the bottom surface  18 A and the right-side surface  18 D intersect. The edge  20 H is positioned at the region where the right-side surface  18 D and the top surface  18 B intersect. The edges  20 E to  20 H are aligned with each other. 
     The edge  20 I is positioned at the region where the front surface  18 E and the left-side surface  18 C intersect. The edge  20 J is positioned at the region where the left-side surface  18 C and the rear surface  18 F intersect. The edge  20 K is positioned at the region where the rear surface  18 F and the right-side surface  18 D intersect. The edge  20 L is positioned at the region where the front surface  18 E and the right-side surface  18 D intersect. The edges  201  to  20 L are aligned with each other. 
       FIG. 3  is a perspective view of the charging power supply device according to the present embodiment. As shown in  FIG. 3 , the casing  12  includes a containment chamber  14  (containment portion). A battery (contained item)  16  can be contained inside the containment chamber  14 . The battery  16  can be inserted into and removed from the containment chamber  14 . The battery  16  corresponds to an electric energy storage device of the present invention. 
     As shown in  FIGS. 1 and 3 , a cover portion (covering member, cover)  32  that covers an opening  14   a  continuous with the containment chamber  14  is included on the top portion of the casing  12 . The cover portion  32  includes an open button  33 . When the open button  33  is pressed by a user, the cover portion  32  opens.  FIG. 1  shows a state in which the cover portion  32  is closed.  FIG. 3  shows a state in which the cover portion  32  is open. As shown in  FIG. 1 , the cover portion  32  includes an indicator  30  that indicates the remaining amount of the battery  16 . The cover portion  32  is capable of pivoting on a pivoting shaft  31  (see  FIG. 8 ) provided to the top surface  18 B. This pivoting shaft  31  is provided on the side of a recessed portion  24  described further below. By having the cover portion  32  pivot on the pivoting shaft  31 , the containment chamber  14  can be opened and closed. As shown in  FIG. 3 , when the cover portion  32  is open, the user can insert and remove the battery  16  into and from the containment chamber  14 . As shown in  FIG. 1 , when the cover portion  32  is closed, one end of the cover portion  32  is near the top end of the rear surface  18 F. In other words, when the cover portion  32  is closed, the one end of the cover portion  32  is positioned near the location corresponding to the edge  20 A. The cover portion  32  includes a curved portion  32   a . When the cover portion  32  is closed, the curved portion  32   a  is positioned at a location corresponding to the edge  20 A. 
     As shown in  FIG. 2 , the edge  20 A is positioned at one side of the rear surface  18 F, namely the top side. In other words, the edge  20 A is positioned at one side of the top surface  18 B, namely the rear side. As shown in  FIGS. 2 and 3 , the opening  14   a  continuous with the containment chamber  14 , or a peripheral edge portion  14   b  of the opening  14   a  continuous with the containment chamber  14 , is positioned at the location corresponding to the edge  20 A. 
     As shown in  FIG. 2 , the edge  20 B is positioned at one side of the front surface  18 E, namely the top side. In other words, the edge  20 B is positioned at the other side of the top surface  18 B, namely the front side. As described above, the edge  20 B is aligned with the edge  20 A. As shown in  FIG. 1 , a handle portion (first handle portion, gripping portion, bar, support portion, or grip)  22 B is included at the region corresponding to the edge  20 B. The handle portion  22 B extends in the width direction, i.e., the X direction. 
     As shown in  FIG. 2 , the edge  20 C is positioned at the other side of the front surface  18 E, namely the bottom side. In other words, the edge  20 C is positioned at the one side of the bottom surface  18 A, namely the front side. As described above, the edge  20 C is aligned with the edge  20 A. As shown in  FIG. 1 , a handle portion (second handle portion, gripping portion, bar, support portion, or grip)  22 C is included at the region corresponding to the edge  20 C. The handle portion  22 C extends in the width direction, i.e., the X direction. 
     The edge  20 D is positioned at the other side of the rear surface  18 F, namely the bottom side. In other words, the edge  20 D is positioned at the other side of the bottom surface  18 A, namely the rear side. As described above, the edge  20 D is aligned with the edge  20 A.  FIG. 4  is a perspective view of the charging power supply device according to the present embodiment. As shown in  FIG. 4 , a handle portion (third handle portion, support portion, holding portion, or recessed portion)  22 D is included at the region corresponding to the edge  20 D. The handle portion  22 D extends in the width direction, i.e., the X direction, and is depressed toward the front surface  18 E side. In other words, the handle portion  22 D is formed by forming a recessed space  54  (see  FIG. 4 ) that is recessed toward the top surface  18 B side in the casing  12 . The recessed space  54  is defined by a portion  56   f  (see  FIG. 7 ) described further below. As shown in  FIG. 7 , the top part of this portion  56   f  is bent toward the rear surface  18 F side. The part of this portion  56   f  that is bent toward the rear surface  18 F side is positioned on the top surface  18 B side of the bottom end region of the handle portion  22 D. The reference numeral  22  is used when describing a handle portion in general, and the reference numerals  22 B to  22 D are used when describing each individual handle portion. 
     As shown in  FIG. 1 , the recessed portion  24 , which has a shape formed by cutting away a part of the top surface  18 B and the front surface  18 E, is formed near the region corresponding to the edge  20 B. The floor portion of the recessed portion  24  is defined by a member  25 , one side portion of the recessed portion  24  is formed by part of an outer marginal member  44 C described further below, and the other side portion of the recessed portion  24  is formed by part of an outer marginal member  44 D described further below. The surface of the member  25  forming the floor portion of the recessed portion  24  is inclined relative to the top surface  18 B. Since the recessed portion  24  is formed in this way, the handle portion  22 B can be included at the location corresponding to the edge  20 B. The member  25  forming the floor portion of the recessed portion  24  includes a USB power output terminal (output terminal or connector)  26  and an AC power output terminal (output terminal or connector)  28 . The USB power output terminal  26  and the AC power output terminal  28  are for supplying power from the charging power supply device  10  to an external device. The USB power output terminal  26  can output DC power. The USB power output terminal  26  is, for example, a USB terminal to which a USB cable can be connected. That is, The USB power output terminal  26  is an outlet to which a USB cable can be connected. A load that receives DC power can be connected to the USB power output terminal  26 . The AC power output terminal  28  can output AC power. The AC power output terminal  28  is an outlet to which a commercial power supply plug can be connected, for example. A load that receives AC power can be connected to the AC power output terminal  28 . Here, an example is described of a case where two USB power output terminals  26  and two AC power output terminals  28  are included, but the number of USB power output terminals  26  and the number of AC power output terminals  28  are not limited to this.  FIG. 1  shows a state in which caps  27  and  29  respectively cover the USB power output terminal  26  and the AC power output terminal  28 . The caps  27  and  29  are for protecting the USB power output terminal  26  and the AC power output terminal  28 , respectively. 
       FIGS. 5A to 5F  are six orthogonal views of the charging power supply device according to the present embodiment.  FIG. 5A  is a bottom view,  FIG. 5B  is a top view,  FIG. 5C  is a left side view,  FIG. 5D  is a right side view,  FIG. 5E  is a front view, and  FIG. 5F  is a rear view.  FIGS. 5C, 5D, 5E, and 5F  show grounding protrusions  38  that are described further below, but these grounding protrusions  38  are omitted from  FIG. 5A . 
     As shown in  FIG. 5F , an AC power input terminal (input terminal or connector)  34 A and a DC power input terminal (input terminal or connector)  34 B are included in the recessed space  54 . The AC power input terminal  34 A and the DC power input terminal  34 B are for supplying power to the charging power supply device  10 . The AC power input terminal  34 A is a socket to which a power supply cable (not shown in the drawings) can be connected. The power supply cable is connected to the AC power input terminal  34 A for inputting power supplied from a commercial AC power supply to the charging power supply device  10 . The DC power input terminal  34 B is a socket to which a power supply cable (not shown in the drawings) can be connected. The power supply cable is connected to the DC power input terminal  34 B for inputting DC power to the charging power supply device  10 . 
     As shown in  FIG. 5A , screw holes  40 A for attaching the grounding protrusions  38  (see  FIG. 3 ) are included in the bottom surface  18 A of the casing  12 .  FIG. 6  is a cross-sectional view of the charging power supply device according to the present embodiment. As shown in  FIG. 6 , the grounding protrusions  38  can be attached to the bottom surface  18 A of the casing  12  by using screws  42 . When the casing  12  is set to the upright position in a state where the grounding protrusions  38  are attached to the bottom surface  18 A, the grounding protrusions  38  enter a state of protruding toward the floor (floor surface, loading surface, or installation surface). As shown in  FIG. 5C , screw holes  40 C for attaching the grounding protrusions  38  are included at the four corners of the outer marginal member  44 C, described further below. Furthermore, as shown in  FIG. 5D , screw holes  40 D for attaching the grounding protrusions  38  are included at the four corners of the outer marginal member  44 D, described further below. It is also possible to remove the grounding protrusions  38  from the bottom surface  18 A of the casing  12  and attach the grounding protrusions  38  to the four corners of the outer marginal member  44 C or the four corners of the outer marginal member  44 D. 
     As shown in  FIGS. 5A and 6 , a ventilation path (ventilation port, intake port, intake path, or gap)  36 A (see  FIG. 5 ) is included in the bottom surface  18 A. The ventilation path  36 A is formed by a partial ventilation path  36 Ac and a partial ventilation path  36 Ad. As shown in  FIGS. 5C and 6 , a ventilation path (ventilation port, intake port, intake path, or gap)  36 C is included in the left-side surface  18 C. As shown in  FIGS. 5D and 6 , a ventilation path (ventilation port, intake port, intake path, or gap)  36 D is included in the right-side surface  18 D. 
       FIG. 7  is a cross-sectional perspective view of the charging power supply device according to the present embodiment. In  FIG. 7 , a slit  59  (see  FIG. 10 ) described further below and an opening  57   d  (see  FIG. 10 ) described further below are omitted from the drawing.  FIG. 8  is a cross-sectional view of a portion of the charging power supply device according to the present embodiment.  FIG. 8  shows a cross section on the front surface  18 E side.  FIG. 9  is a cross-sectional view of a portion of the charging power supply device according to the present embodiment.  FIG. 9  shows a cross section on the rear surface  18 F side. As shown in  FIG. 7 , a ventilation path (ventilation port, exhaust port, exhaust path, or gap)  36 E is included in the front surface  18 E. The ventilation path  36 E is formed by a partial ventilation path  36 Ea and a partial ventilation path  36 Eb. As shown in  FIG. 7 , a ventilation path (ventilation port, intake port, intake path, or gap)  36 F is included in the rear surface  18 F. The ventilation path  36 F is formed by a partial ventilation path  36 Fa and a partial ventilation path  36 Fb. The reference numeral  36  is used when describing a ventilation path in general, and the reference numerals  36 A,  36 C,  36 D,  36 E, and  36 F are used when describing each individual ventilation path. According to the present embodiment, the ventilation paths  36 A,  36 C,  36 D,  36 E, and  36 F are included in the bottom surface  18 A, the left-side surface  18 C, the right-side surface  18 D, the front surface  18 E, and the rear surface  18 F. Therefore, by using a blower  52  described further below to blow air, it is possible to bring air into the casing  12  via the ventilation paths  36 A,  36 C,  36 D, and  36 F, for example, and to expel the air from inside the casing  12  via the ventilation path  36 E, for example. Therefore, according to the present embodiment, it is possible to favorably cool the inside of the casing  12 . 
       FIG. 10  shows members included on the bottom surface side of the casing. A member  56  is included on the bottom surface  18 A side of the casing  12 . The member  56  includes a board-shaped portion  56   a  corresponding to the bottom surface  18 A. The portion  56   f  bent from and continuous with this portion  56   a  is included at one side of the portion  56   a , namely the rear surface  18 F side. A portion  56   e  bent from and continuous with this portion  56   a  is included at the other side of the portion  56   a , namely the front surface  18 E side. The portion  56   f  is positioned on the rear surface  18 F side, and the portion  56   e  is positioned on the front surface  18 E side. The portion  56   f  includes an opening  57   c , to which the AC power input terminal  34 A is attached, and the opening  57   d , to which the DC power input terminal  34 B is attached. A plurality of slits  59  are formed in the portion  56   f . Air can flow between the inside and outside of the casing  12  through the slit  59 . Here, an example is shown of a case where five slits  59  are formed, but the number of slits  59  is not limited to five. 
     As shown in  FIGS. 5C, 5D, and 6 , the casing  12  includes the outer marginal members (frames)  44 C and  44 D and inner members (side covers or panels)  46 C and  46 D. 
     The outer marginal member  44 C is formed by a ring-shaped (frame-shaped) member, for example. The inner member  46 C is formed by a board-shaped member, for example. The portion of the outer marginal member  44 C positioned on the left-side surface  18 C forms the outer margin side of the left-side surface  18 C. The inner member  46 C is included on the inner side of the outer marginal member  44 C. The ventilation path  36 C is formed between the inner end of the outer marginal member  44 C and the outer end of the inner member  46 C. The outer margin of the inner member  46 C is larger than the inner margin of the outer marginal member  44 C. The inner member  46 C is fixed to the casing  12  using an inset type of fixing mechanism (fixing structure)  47 . The fixing mechanism  47  is included to correspond to the four corners of the inner member  46 C, for example. By releasing the fixing realized by the fixing mechanism  47 , it is possible to remove the inner member  46 C from the casing  12 . The portion of the inner member  46 C overlapping with the outer marginal member  44 C is positioned farther to the outside of the casing  12  relative to the portion of the outer marginal member  44 C overlapping with the inner member  46 C. Therefore, in the state where the outer marginal member  44 C is fixed to the casing  12 , it is possible to remove the inner member  46 C. 
     As shown in  FIG. 6 , the outer marginal member  44 C includes a protruding portion (protruding part or barb)  48 C that protrudes toward the inner member  46 C, in the region where the inner member  46 C and the outer marginal member  44 C overlap. The protruding portion  48 C is provided on the inner margin of the outer marginal member  44 C.  FIGS. 11A to 11C  conceptually show the flow of water.  FIG. 11A  is a left side view.  FIG. 11B  is a cross-sectional view of the left side surface  18 C. As shown in  FIG. 11A , the protruding portion  48 C is formed with an annular shape in a manner to follow along the outer periphery of the inner member  46 C. The corner portions of the protruding portion  48 C formed with the annular shape are curved as shown in  FIG. 11A . Specifically, the protruding portion  48 C is formed by linear portions  48 CLA,  48 CLB,  48 CLE, and  48 CLF and curved portions  48 CCA,  48 CCB,  48 CCC, and  48 CCD. The linear portion  48 CLA is a portion following along the bottom surface  18 A. The linear portion  48 CLB is a portion following along the top surface  18 B. The linear portion  48 CLE is a portion following along the front surface  18 E. The linear portion  48 CLF is a portion following along the rear surface  18 F. The curved portion  48 CCA is positioned near the region corresponding to the edge  20 A. The curved portion  48 CCB is positioned near the region corresponding to the edge  20 B. The curved portion  48 CCC is positioned near the region corresponding to the edge  20 C. The curved portion  48 CCD is positioned near the region corresponding to the edge  20 D. Since the protruding portion  48 C protruding toward the inner member  46 C is included on the inner margin of the outer marginal member  44 C, the water flowing into the casing  12  via the ventilation path  36 C can flow in the manner described below. For example, water that flows into the portion of the ventilation path  36 C corresponding to the linear portion  48 CLB collides with the protruding portion  48 C, and thereafter reaches the inner surface of the inner member  46 C. The water having reached the inner surface of the inner member  46 C can flow vertically along the inner surface of the inner member  46 C (see  FIG. 11B ). Furthermore, water that flows into the portion of the ventilation path  36 C corresponding to the curved portion  48 CCA flows along the surface of the outer marginal member  44 C while conforming to the shape of the curved portion  48 CCA. Then the water flowing along the surface of the outer marginal member  44 C while conforming to the shape of the curved portion  48 CCA can flow along the surface of the outer marginal member  44 C while conforming to the shape of the linear portion  48 CLF. Furthermore, water that flows into the portion of the ventilation path  36 C corresponding to the curved portion  48 CCB flows along the surface of the outer marginal member  44 C while conforming to the shape of the curved portion  48 CCB. Then the water can flow along the surface of the outer marginal member  44 C while conforming to the shape of the linear portion  48 CLE. In this way, the protruding portion  48 C realizes the role of a gutter. 
     The positional relationship between the inner member  46 C and the outer marginal member  44 C, in the direction from the right-side surface  18 D toward the left-side surface  18 C, is as described below. Specifically, the portion of the outer marginal member  44 C positioned farthest in said direction is positioned on said direction side of the portion of the inner member  46 C positioned farthest in said direction. In other words, in the normal direction of the left-side surface  18 C, the most-protruding portion of the inner member  46 C is positioned backward relative to the most-protruding portion of the outer marginal member  44 C. Therefore, when the casing  12  is arranged with the left-side surface  18 C side in contact with the floor, the outer marginal member  44 C contacts the floor but the inner member  46 C does not contact the floor.  FIG. 11C  shows a state in which the casing  12  is arranged with the left-side surface  18 C on the bottom side. When water has flowed into the casing  12 , this water can be expelled to the outside of the casing  12  via the ventilation path  36 C, as shown in  FIG. 11C . 
     The outer marginal member  44 D and the outer marginal member  44 C have mirror symmetry with respect to the left-right center of the casing  12 . Furthermore, the inner member  46 D and the inner member  46 C have mirror symmetry relative to the left-right center of the casing  12 . In a state where the outer marginal member  44 D is fixed to the casing  12 , the inner member  46 D can be removed. The flow of water occurring when water flows into the casing  12  via the ventilation path  36 D is the same as the flow of water occurring when water flows into the casing  12  via the ventilation path  36 C. 
     As shown in  FIGS. 7 and 8 , a board-shaped member  46 E is included on the front surface  18 E side. A portion  46 Eb of the member  46 E positioned on the top surface  18 B side overlaps with a portion  25 E of the member  25  on the front surface  18 E side. The portion  46 Eb of the member  46 E overlapping with the member  25  is positioned on the inner side of the casing  12  relative to the portion  25 E of the member  25  overlapping with the member  46 E. The partial ventilation path  36 Eb is formed between the portion  46 Eb of the member  46 E positioned on the top surface  18 B side and the portion  25 E of the member  25  positioned on the front surface  18 E side. In the manner described above, the ventilation path  36 E is formed by the partial ventilation path  36 Ea and the partial ventilation path  36 Eb. 
     The positional relationship between the member  46 E and the outer marginal members  44 C and  44 D, in the direction from the rear surface  18 F toward the front surface  18 E, is as described below. Specifically, the portions of the outer marginal members  44 C and  44 D positioned farthest in said direction are positioned on said direction side of the portion of the member  46 E positioned farthest in said direction. In other words, in the normal direction of the front surface  18 E, the most-protruding portion of the member  46 E is positioned backward relative to the most-protruding portions of the outer marginal members  44 C and  44 D. Therefore, when the casing  12  is arranged such that the front surface  18 E side contacts the floor, the outer marginal members  44 C and  44 D contact the floor, but the member  46 E does not contact the floor and the ventilation path  36 E does not become blocked by the floor. Therefore, according to the present embodiment, even when the casing  12  is arranged such that the front surface  18 E side contacts the floor, the air expelled by the blower  52  described further below can be expelled to the outside of the casing  12  via the ventilation path  36 E. 
     As shown in  FIGS. 7 and 9 , a board-shaped member  46 F is included on the rear surface  18 F side. The partial ventilation path  36 Fa is formed between the portion  56   f  described above and the member  46 F. The partial ventilation path  36 Fa is included in the recessed space  54  described above. Since the partial ventilation path  36 Fa is included inside the recessed space  54  and not on the surface of the casing  12 , it is difficult for foreign matter to enter into the casing  12  via the partial ventilation path  36 Fa. The partial ventilation path  36 Fb is formed between a portion of the member  46 F positioned on the top surface  18 B side and a member  49  included to the top surface  18 B side of the member  46 F. The member  49  is positioned between the cover portion  32  and the member  46 F. In the manner described above, the ventilation path  36 F is formed by the partial ventilation path  36 Fa and the partial ventilation path  36 Fb. 
     As shown in  FIG. 6 , the partial ventilation path  36 Ac is formed between the portion  56   a  and the outer marginal member  44 C. Furthermore, the partial ventilation path  36 Ad is formed between the portion  56   a  and the outer marginal member  44 D. In the manner described above, the ventilation path  36 A is formed by the partial ventilation path  36 Ac and the partial ventilation path  36 Ad. Since the casing  12  is not arranged with the top surface  18 B facing the floor, there are no instances where the casing  12  is arranged such that the bottom surface  18 A in which the ventilation path  36 A is formed faces upward. Therefore, there is only a low possibility of foreign matter entering into the casing  12  via the ventilation path  36 A, which means that there is only a low possibility of this foreign matter reaching a power converting apparatus  17  described further below. In the manner described above, the ventilation path  36 A is formed by the partial ventilation path  36 Ac and the partial ventilation path  36 Ad. 
     As shown in  FIGS. 7 and 10 , a portion  46 Ea of the member  46 E positioned on the bottom surface  18 A side overlaps with a portion  56   ex  of the member  56  on the front surface  18 E side. The portion  46 Ea of the member  46 E overlapping with the member  56  is positioned on the inner side of the casing  12  relative to the portion  56   ex  of the member  56  overlapping with the member  46 E. The partial ventilation path  36 Ea is formed between the portion  46 Ea of the member  46 E positioned on the bottom surface  18 A side and the portion  56   ex  of the member  56  positioned on the front surface  18 E side. 
     The cross-sectional area (opening size) of the ventilation path  36 E and the cross-sectional area of the ventilation path  36 A differ from each other. More specifically, the cross-sectional area of the ventilation path  36 A is smaller than the cross-sectional area of the ventilation path  36 E. The cross-sectional area of the ventilation path  36 C is equivalent to the cross-sectional area of the ventilation path  36 D. The cross-sectional area of the ventilation path  36 C and the cross-sectional area of the ventilation path  36 E differ from each other. More specifically, the cross-sectional area of the ventilation path  36 C is smaller than the cross-sectional area of the ventilation path  36 E. The cross-sectional area of the ventilation path  36 D and the cross-sectional area of the ventilation path  36 E differ from each other. The cross-sectional area of the ventilation path  36 D is smaller than the cross-sectional area of the ventilation path  36 E. The cross-sectional area of the ventilation path  36 E and the cross-sectional area of the ventilation path  36 F differ from each other. More specifically, the cross-sectional area of the ventilation path  36 F is smaller than the cross-sectional area of the ventilation path  36 E. In this way, in the present embodiment, the cross-sectional areas of the ventilation paths  36 A,  36 C,  36 D, and  36 F for sucking in air using the blower  52  described further below are set to be relatively small. Therefore, according to the present embodiment, it is possible to restrict foreign matter from entering into the casing  12  via the ventilation paths  36 A,  36 C,  36 D, and  36 F. On the other hand, in the present embodiment, the cross-sectional area of the ventilation path  36 E for expelling air using the blower  52  described further below is set to be relatively large. Therefore, according to the present embodiment, even in the extremely rare situation where foreign matter has entered into the casing  12 , it is possible to effectively expel this foreign matter. 
       FIGS. 12A and 12B  show the charging power supply device according to the present embodiment.  FIG. 12A  is a horizontal cross-sectional view seen from the top surface  18 B side.  FIG. 12B  is a vertical cross-sectional view seen from the right-side surface  18 D side. In  FIGS. 12A and 12B , the arrows with hatching conceptually show the flow of air. 
     As shown in  FIGS. 12A and 12B , a plurality of heating bodies  50 A and  50 B are included. The reference numeral  50  is used when describing a heating body in general, and the reference numerals  50 A and  50 B are used when describing each individual heating body. Furthermore, the blower (fan)  52  for cooling the heating bodies  50 A and  50 B is also included in the casing  12 . The blower  52  sends air from the right side to the left side in  FIGS. 12A and 12B . The heating bodies  50 A and  50 B are positioned downstream from the ventilation paths  36 A,  36 C,  36 D, and  36 F. The heating bodies  50 A and  50 B are positioned upstream from the blower  52 . The heating body  50 A is the battery  16 , for example. The heating body  50 B is the power converting apparatus (invertor converter unit)  17 , for example. The heating body  50 B will reach a higher temperature than the heating body  50 A. The heating body  50 A is arranged upstream from the heating body  50 B. There is a partition wall  51 A between the containment chamber  14  in which the heating body  50 A is housed and the portion (containment chamber) where the heating body  50 B is housed. There is a partition wall  51 B between the portion where the heating body  50 B is housed and the portion where the blower  52  is housed. As shown in  FIG. 12A , a barrier member (sealing material)  53 C 1  is included between the portion of the heating body  50 A on the front surface  18 E side and the left-side surface  18 C. A barrier member  53 D 1  is included between the portion of the heating body  50 A on the front surface  18 E side and the right-side surface  18 D. A barrier member  53 C 2  is included between the heating body  50 B and the left-side surface  18 C. A barrier member  53 D 2  is included between the heating body  50 B and the right-side surface  18 D. As shown in  FIG. 12B , a barrier member  53 A 1  is included between the bottom end portion of the partition wall  51 A and the heating body  50 B. A barrier member  53 A 2  is included between the portion of the heating body  50 B on the front surface  18 E side and the portion  56   e . The barrier members  53 C 1 ,  53 D 1 ,  53 C 2 ,  53 D 2 ,  53 A 1 , and  53 A 2  are for blocking the flow of air. The barrier members  53 C 1 ,  53 D 1 ,  53 C 2 ,  53 D 2 ,  53 A 1 , and  53 A 2  can be formed by a foam sealant, for example, but are not limited to this. Since the heating bodies  50 A and  50 B, the blower  52 , the partition walls  51 A and  51 B, and the barrier members  53 A 1 ,  53 A 2 ,  53 C 1 ,  53 C 2 ,  53 D 1 , and  53 D 2  are arranged this way, the air flows inside the casing  12  as shown by the arrow marks. 
       FIGS. 13A to 13F  show six orthogonal views of the charging power supply device according to the present embodiment.  FIG. 13A  is a bottom view,  FIG. 13B  is a top view,  FIG. 13C  is a left side view,  FIG. 13D  is a right side view,  FIG. 13E  is a front view, and  FIG. 13F  is a rear view.  FIG. 13  shows a state in which the grounding protrusions  38  (see  FIGS. 5C to 5F ) are removed. 
     When the casing  12  is arranged such that the bottom surface  18 A is in contact with the floor, the positional relationship between the outer marginal members  44 C and  44 D and the floor, in the direction from the top surface  18 B toward the bottom surface  18 A, is as described below. Specifically, a portion (region)  58 Ac (see  FIG. 14 ) of the outer marginal member  44 C positioned farthest in said direction and a portion  58 Ad of the outer marginal member  44 D positioned farthest in said direction are in contact with the floor. These portions  58 Ac and  58 Ad are linear, as shown in  FIG. 13A . Since the entire bottom surface  18 A does not contact the floor and the liner portions  58 Ac and  58 Ad do contact the floor, the frictional force occurring when the casing  12  is slid in the longitudinal direction of these portions  58 Ac and  58 Ad is relatively small. Accordingly, when the casing  12  is slid in the direction of an arrow mark  60 A shown in  FIG. 13A , it is possible for the casing  12  to be slid with relatively little force. In this way, when the casing  12  is arranged such that the bottom surface  18 A is in contact with the floor, the casing  12  can be slid in the direction from the front surface  18 E toward the rear surface  18 F with relatively little force. Furthermore, when the casing  12  is arranged such that the bottom surface  18 A is in contact with the floor, the casing  12  can be slid in the direction from the rear surface  18 F toward the front surface  18 E with relatively little force. 
     When the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor, the positional relationship between the outer marginal member  44 C and the floor, in the direction from the right-side surface  18 D toward the left-side surface  18 C, is as described below. Specifically, a portion  58 C (see  FIG. 11C ) of the outer marginal member  44 C positioned farthest in said direction is in contact with the floor.  FIG. 14  is a cross-sectional view of a portion of the charging power supply device according to the present embodiment.  FIG. 14  shows a state in which the grounding protrusion  38  is attached to the bottom surface  18 A side. As shown in  FIG. 13C , the portion  58 C is a substantially rectangular frame, that is, a substantially rectangular ring. Since the entire left-side surface  18 C is not in contact with the floor and the ring-shaped portion  58 C is in contact with the floor, the frictional force is relatively low when the casing  12  slides. Accordingly, when the casing  12  is slid in the direction of an arrow mark  60 C shown in  FIG. 13C , the casing  12  can be slid with relatively little force. In this way, when the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor, the casing  12  can be slid in the direction from the front surface  18 E toward the rear surface  18 F with relatively little force. Furthermore, when the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor, the casing  12  can be slid in the direction from the rear surface  18 F toward the front surface  18 E with relatively little force. When the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor, the casing  12  can be slid in the direction from the bottom surface  18 A toward the top surface  18 B with relatively little force. When the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor, the casing  12  can be slid in the direction from the top surface  18 B toward the bottom surface  18 A with relatively little force. 
     When the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor, the ring-shaped portion  58 C contacts the floor, and therefore the air intake via the ventilation path  36 C included in the left-side surface  18 C is restricted. Due to this, in such a case, foreign matter is restricted from entering into the casing  12  via the ventilation path  36 C. 
     When the casing  12  is arranged such that the right-side surface  18 D is in contact with the floor, the positional relationship between the outer marginal member  44 D and the floor, in the direction from the left-side surface  18 C toward the right-side surface  18 D, is as described below. Specifically, a portion  58 D of the outer marginal member  44 D positioned farthest in said direction is in contact with the floor. The right-side surface  18 D and the left-side surface  18 C have mirror symmetry with respect to the left-right center of the casing  12 . Accordingly, when the casing  12  is arranged such that the right-side surface  18 D is in contact with the floor, the casing  12  can be slid with relatively little force, in the same manner as when the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor. Furthermore, when the casing  12  is arranged such that the right-side surface  18 D is in contact with the floor, foreign matter is restricted from entering into the casing  12  via the ventilation path  36 D, in the same manner as when the casing  12  is arranged such that the left-side surface  18 C is in contact with the floor. 
     When the casing  12  is arranged such that the front surface  18 E is in contact with the floor, the positional relationship between the outer marginal members  44 C and  44 D and the floor, in the direction from the rear surface  18 F toward the front surface  18 E, is as described below. Specifically, a portion  58 Ec of the outer marginal member  44 C positioned farthest in said direction and a portion  58 Ed of the outer marginal member  44 D positioned farthest in said direction are in contact with the floor. These portions  58 Ec and  58 Ed are linear, as shown in  FIG. 13E . Since the entire front surface  18 E is not in contact with the floor and the linear portions  58 Ec and  58 Ed are in contact with the floor, the frictional force is relatively small when the casing  12  is slid in the longitudinal direction of these portions  58 Ec and  58 Ed. Accordingly, when the casing  12  is slid in the direction of an arrow mark  60 E shown in  FIG. 13E , it is possible for the casing  12  to be slid with relatively little force. In this way, when the casing  12  is arranged such that the front surface  18 E is in contact with the floor, the casing  12  can be slid in the direction from the bottom surface  18 A toward the top surface  18 B with relatively little force. Furthermore, when the casing  12  is arranged such that the front surface  18 E is in contact with the floor, the casing  12  can be slid in the direction from the top surface  18 B toward the bottom surface  18 A with relatively little force. 
     When the casing  12  is arranged such that the rear surface  18 F is in contact with the floor, the positional relationship between the outer marginal members  44 C and  44 D and the floor, in the direction from the front surface  18 E toward the rear surface  18 F, is as described below. Specifically, a portion  58 Fc of the outer marginal member  44 C positioned farthest in said direction and a portion  58 Fd of the outer marginal member  44 D positioned farthest in said direction are in contact with the floor. These portions  58 Fc and  58 Fd are linear, as shown in  FIG. 13F . Since the entire rear surface  18 F is not in contact with the floor and the linear portions  58 Fc and  58 Fd are in contact with the floor, the frictional force is relatively small when the casing  12  is slid in the longitudinal direction of these portions  58 Fc and  58 Fd. Accordingly, when the casing  12  is slid in the direction of an arrow mark  60 F shown in  FIG. 13F , it is possible for the casing  12  to be slid with relatively little force. In this way, when the casing  12  is arranged such that the rear surface  18 F is in contact with the floor, the casing  12  can be slid in the direction from the bottom surface  18 A toward the top surface  18 B with relatively little force. Furthermore, when the casing  12  is arranged such that the rear surface  18 F is in contact with the floor, the casing  12  can be slid in the direction from the top surface  18 B toward the bottom surface  18 A with relatively little force. 
       FIG. 15  shows a state in which the casing is inclined.  FIG. 15  shows a state in which the casing  12  is inclined such that only the region corresponding to the edge  20 G, which is positioned at the region where the bottom surface  18 A and the right-side surface  18 D intersect, is in contact with a floor  62 . When the casing  12  is inclined in this way, the positional relationship between the outer marginal member  44 D and the floor  62 , in the direction from the casing  12  toward the floor  62 , is as described below. Specifically, a portion  58 X of the outer marginal member  44 D positioned farthest in said direction is in contact with the floor  62 . This portion  58 X is linear. Since the portion  58 X in contact with the floor  62  is linear, the frictional amount is relatively small when the casing  12  is slid in a direction intersecting the longitudinal direction of this portion  58 X. Accordingly, when the casing  12  is slid in the direction of an arrow mark  60 X shown in  FIG. 15 , the casing  12  can be slid with relatively little force. When the casing  12  is inclined to the opposite side, the positional relationship between the outer marginal member  44 C and the floor  62 , in the direction from the casing  12  toward the floor  62 , is as described below. Specifically, a portion  58 X′ of the outer marginal member  44 C positioned farthest in said direction is in contact with the floor  62 . This portion  58 X′ is linear. Since the portion  58 X′ in contact with the floor  62  is linear, the frictional amount is relatively small when the casing  12  is slid in a direction intersecting the longitudinal direction of this portion  58 X′. Accordingly, even in a case where the casing  12  is inclined to the opposite side, when the casing  12  is slid in the direction of the arrow mark  60 X shown in  FIG. 15 , the casing  12  can be slid with relatively little force. 
       FIG. 16  shows an example of a case of transporting the charging power supply device according to the present embodiment.  FIG. 16  shows an example of a case in which the casing  12  is arranged on the floor  62  such that the right-side surface  18 D is on the bottom. The floor  62  shown in  FIG. 16  is a loading platform or the like of an automobile, for example, but is not limited to this.  FIG. 16  shows an example of a case in which the height of the floor  62  on which the casing  12  is arranged is greater than the height of the floor (not shown in the drawings) on which a user  64  is standing.  FIG. 16  shows an example of a case in which the handle portion  22 B is gripped by a right hand  66 R of the user  64 , and the handle portion  22 C is gripped by a left hand  66 L of the user  64 . While gripping the handle portions  22 B and  22 C, the user  64  can pull the charging power supply device  10  out from the loading platform or the like of the automobile. 
       FIG. 17  shows an example of a case of transporting the charging power supply device according to the present embodiment.  FIG. 17  shows an example of a case in which the user  64  carries the charging power supply device  10  alone.  FIG. 17  shows an example of a case where the handle portion  22 B is gripped by the right hand  66 R of the user  64  and the handle portion  22 D is gripped by the left hand  66 L of the user  64 . While gripping the handle portions  22 B and  22 D, the user  64  can carry the charging power supply device  10 . 
       FIG. 18  shows an example of a case of transporting the charging power supply device according to the present embodiment.  FIG. 18  shows an example where two users  64 A and  64 B cooperate to carry the charging power supply device  10 .  FIG. 18  shows an example of a case where, when climbing a staircase, the user  64 A is positioned in front and the user  64 B is positioned to the rear.  FIG. 18  shows an example of a case in which the handle portion  22 B is gripped by a right hand  64 AR of the user  64 A and the handle portion  22 D is gripped by a right hand  64 BR of the user  64 B. The users  64 A and  64 B can carry the charging power supply device  10  in this way as well. 
       FIG. 19  shows an example of inserting or removing a battery into and from a containment chamber.  FIG. 19  shows an example of a case where the casing  12  is arranged such that the bottom surface  18 A faces the floor  62 .  FIG. 19  shows an example of a case in which the battery  16  is inserted or removed into or from the containment chamber  14  in the depth direction of the containment chamber  14  (in the vertical direction). The user can insert or remove the battery  16  into or from the containment chamber  14  in this way. 
       FIG. 20  shows an example of inserting the battery into the containment chamber.  FIG. 20  shows an example of a case where the casing  12  is arranged such that the bottom surface  18 A faces the floor  62 . As described above, the opening  14   a  continuous with the containment chamber  14 , or the peripheral edge portion  14   b  of the opening  14   a  continuous with the containment chamber  14 , is positioned at the portion corresponding to the edge  20 A. The handle portions  22 B to  22 D are not provided at the position corresponding to the edge  20 A. Since the opening  14   a  continuous with the containment chamber  14 , or the peripheral edge portion  14   b  of the opening  14   a  continuous with the containment chamber  14 , is positioned at the portion corresponding to the edge  20 A, the portion of the inner side surface of the containment chamber  14  on the rear surface  18 F side can function as a guide portion (guiding portion) when inserting the battery  16 . In this way, the battery  16  can be inserted into the containment chamber  14  from a direction inclined relative to the depth direction of the containment chamber  14 . In other words, the battery  16  can be inserted into the containment chamber  14  from a direction other than the depth direction of the containment chamber  14 . 
       FIG. 21  shows an example of inserting the battery into the containment chamber.  FIG. 21  shows an example of a case where the casing  12  is arranged such that the front surface  18 E faces the floor  62 . As described above, the opening  14   a  continuous with the containment chamber  14 , or the peripheral edge portion  14   b  of the opening  14   a  continuous with the containment chamber  14 , is positioned at the portion corresponding to the edge  20 A. A handle portion  22  is not provided at the portion corresponding to the edge  20 A. Since the opening  14   a  continuous with the containment chamber  14 , or the peripheral edge portion  14   b  of the opening  14   a  continuous with the containment chamber  14 , is positioned at the portion corresponding to the edge  20 A, the portion of the inner side surface of the containment chamber  14  on the rear surface  18 F side can function as the guide portion when inserting the battery  16 . In this way, the battery  16  can be inserted into the containment chamber  14  from a direction inclined relative to the depth direction of the containment chamber  14 . In other words, the battery  16  can be inserted into the containment chamber  14  from a direction other than the depth direction of the containment chamber  14 . 
       FIG. 22  is a perspective view showing the motive power transmission device.  FIG. 23  is a top view showing the motive power transmission device.  FIG. 24  is a side view showing the motive power transmission device.  FIG. 25  is a side view showing the motive power transmission device. In  FIGS. 22 to 25 , a connector unit  262  is shown together with a motive power transmission device  200 . The motive power transmission device  200  and the connector unit  262  are disposed on a bottom surface  14   c  of the containment chamber  14  ( FIG. 3 ) of the casing  12 . 
     The connector unit  262  includes a connector  266  having a casing-side connection terminal  274  that is connected to a battery-side connection terminal  272  ( FIG. 31 ) provided on the bottom surface of the battery  16  contained in the containment chamber  14 . The connector unit  262  is provided so as to be movable in the vertical direction (Z direction) along two poles  268   a  and  268   b  extending from a plate  201  of the bottom surface  14   c  toward the negative side in the Z direction. 
     The motive power transmission device  200  is a device that, when the battery  16  is contained in the containment chamber  14 , transmits a force acting on the motive power transmission device  200  from the battery  16  to the connector unit  262  to move the connector unit  262  to the battery  16  side (positive side in the Z direction). By the structure, the connector  266  moves from the negative side in the Z direction of the plate  201  to the positive side in the Z direction, and the casing-side connection terminal  274  are connected to the battery-side connection terminal  272  of the battery  16 . 
       FIG. 26  is a cross-sectional perspective view showing the motive power transmission device. In  FIG. 26 , a part of the connector unit  262  is omitted.  FIG. 26  shows the motive power transmission device  200  in a state in which an input lever  204 , which will be described later, is rotated further toward the back side of  FIG. 22  (negative side in the X direction) than the position shown in  FIG. 22 . 
     The motive power transmission device  200  includes a housing  202 , the input lever  204 , an input cylinder  206 , a main spring  208 , a power shaft  210 , an output lever  212 , a damper  214 , and a return spring  216 . The motive power transmission device  200  transmits a force for rotating the input lever  204  as a force for rotating the output lever  212 . Further, when an excessive force is input in a short time to rotate the input lever  204  at high speed, the motive power transmission device  200  stores a part of the input energy in the main spring  208 , attenuates the input force by the damper  214 , and outputs the attenuated force to the output lever  212 . 
     For the input lever  204 , a roller  220  is pivotably supported at a distal end of an arm portion  218  thereof. When the battery  16  is contained in the containment chamber  14 , the bottom portion of the battery  16  comes into contact with the roller  220 . Force from the battery  16  is input to the input lever  204  around an input center  220   a  of the roller  220 , and force that rotates the input lever  204  acts on the input lever  204 . A base portion of the arm portion  218  is fixed to the input cylinder  206 . The input lever  204  and the input cylinder  206  integrally rotate about a pivoting axis parallel to the Y direction. The input cylinder  206  is a member formed in a hollow cylindrical shape having a through-hole passing through the inside thereof in the pivoting axis direction. The input cylinder  206  is pivotably supported by an input member support portion  232  formed in the housing  202 . The input lever  204  and the input cylinder  206  correspond to a first member of the present invention, the input lever  204  corresponds to an input portion of the present invention, and the input cylinder  206  corresponds to a first tubular portion of the present invention. 
     For the output lever  212 , a roller  224  is pivotably supported at a distal end of an arm portion  222  thereof. The roller  224  is connected to the connector unit  262 , and moves the connector unit  262  to the positive side in the Z direction when the output lever  212  pivots. A root portion of the arm portion  222  is fixed to a pin  230  of the power shaft  210 . The output lever  212  and the power shaft  210  integrally pivot on a pivoting axis parallel to the Y direction. The power shaft  210  includes a circular plate portion  226  formed in a circular plate shape, a shaft portion  228  formed to extend from the circular plate portion  226  to the positive side in the Y direction, and the pin  230  formed to extend from the circular plate portion  226  to the negative side in the Y direction. The power shaft  210  is pivotably supported by an output member support portion  234  formed in the housing  202 . The output lever  212  and the power shaft  210  correspond to a second member of the present invention, the output lever  212  corresponds to an output portion of the present invention, and the power shaft  210  corresponds to a shaft portion of the present invention. 
     The input member support portion  232  is formed in a bottomed cylindrical shape in which the negative side in the Y direction is open and the positive side in the Y direction is closed. The output member support portion  234  is formed in a cylindrical shape extending from the bottom surface of the input member support portion  232  to the negative side in the Y direction. The output member support portion  234  is formed so as to penetrate the housing  202 , and both the negative side and the positive side in the Y direction are open. The input member support portion  232  and the output member support portion  234  are formed coaxially. That is, the input cylinder  206  supported by the input member support portion  232  and the power shaft  210  supported by the output member support portion  234  are formed coaxially. The housing  202  corresponds to a third member of the present invention, the input member support portion  232  corresponds to a third tubular portion of the present invention, and the output member support portion  234  corresponds to a second tubular portion of the present invention. 
     The input cylinder  206  is inserted between the inner periphery of the input member support portion  232  and the outer periphery of the output member support portion  234 . The input member support portion  232  pivotably supports the input cylinder  206  via an outer bush  236 . The negative side in the Y direction of the input cylinder  206  protrudes to the outside of the housing  202 , and the input lever  204  is fixed to the portion protruding to the outside. That is, the input lever  204  is disposed on the negative side in the Y direction with respect to the housing  202 . 
     The shaft portion  228  of the power shaft  210  is inserted into the inner periphery of the output member support portion  234 , and the output member support portion  234  pivotably supports the power shaft  210  via two inner bushes  238   a  and  238   b . A front end portion of the shaft portion  228  on the positive side in the Y direction protrudes outward from an opening portion of the housing  202  on the positive side in the Y direction. The circular plate portion  226  of the power shaft  210  is located on the negative side in the Y direction with respect to the output member support portion  234  and is housed in the inner periphery of the input cylinder  206 . The pin  230  protrudes outward from an opening portion of the housing  202  on the negative side in the Y direction, and the output lever  212  is fixed to the pin  230 . That is, the output lever  212  is disposed on the negative side in the Y direction with respect to the housing  202 . A thrust bush  240  is provided at an opening of the input cylinder  206  on the negative side in the Y direction. An inner diameter of the thrust bush  240  is smaller than an outer diameter of the circular plate portion  226  of the power shaft  210 . The thrust bush  240  restricts movement of the power shaft  210  to the negative side in the Y direction. 
     The main spring  208  is housed between the inner periphery of the input cylinder  206  and the outer periphery of the output member support portion  234 . The main spring  208  is a torsion spring having a circumferential portion  208   a  in which a wire material is spirally formed, and is disposed coaxially with the input cylinder  206  and the power shaft  210 . Since the output member support portion  234  is inserted into the inner periphery of the main spring  208 , a tilt of the main spring  208  is restricted. An end portion of the main spring  208  on the positive side in the Y direction is fixed to the input cylinder  206 , and an end portion of the main spring  208  on the negative side in the Y direction is fixed to the circular plate portion  226  of the power shaft  210 . The main spring  208  has elasticity in a pivoting direction of the input cylinder  206  and the power shaft  210 . The force for rotating the input lever  204  is transmitted to the input cylinder  206 , the main spring  208 , and the power shaft  210  in this order, thereby rotating the output lever  212 . That is, the main spring  208  is disposed on a motive power transmission path between the input lever  204  and the input cylinder  206 , and the power shaft  210  and the output lever  212 . Further, since the main spring  208  connecting the input lever  204  and the input cylinder  206  to the power shaft  210  and the output lever  212  is disposed on the inner peripheral side of the input cylinder  206 , the input cylinder  206  and the power shaft  210  can be disposed coaxially, and the input lever  204  and the output lever  212  can be disposed on the same side (negative side in the Y direction). The main spring  208  corresponds to a first elastic member of the present invention, and the circumferential portion  208   a  corresponds to a first circumferential portion of the present invention. 
     A return spring housing portion  244  is formed on the outer peripheral side of the input member support portion  232  of the housing  202 . The return spring housing portion  244  is formed in a circular groove shape formed coaxially with the input member support portion  232  and the output member support portion  234 . The return spring  216  is housed in the return spring housing portion  244 . The return spring  216  is a torsion spring having a circumferential portion  216   a  in which a wire material is spirally formed, and is disposed coaxially with the input cylinder  206  and the power shaft  210 . An end portion of the return spring  216  on the positive side in the Y direction is fixed to a bottom portion of the return spring housing portion return spring housing portion  244 , and an end portion of the return spring  216  on the negative side in the Y direction is fixed to the arm portion  218  of the input lever  204 . The return spring  216  has elasticity in the pivoting direction of the input cylinder  206 . The force for pivoting the input lever  204  is transmitted to the housing  202  via the return spring  216 . The housing  202  is fixed to the plate  201 , and an elastic force acts on the input lever  204  from the return spring  216  in a direction in which pivotal movement of the input lever  204  is prevented. That is, the return spring  216  is disposed on the motive power transmission path between the input lever  204  and the housing  202 . The return spring  216  corresponds to a second elastic member of the present invention, and the circumferential portion  216   a  corresponds to a second circumferential portion of the present invention. 
       FIG. 27  is a cross-sectional view showing the motive power transmission device.  FIG. 27  shows a modification of the motive power transmission device  200  shown in  FIG. 26 . 
     In the motive power transmission device  200  shown in  FIG. 26 , the power shaft  210  is pivotably supported by an output member support portion  234  via the two inner bushes  238   a  and  238   b . In a modified example of the motive power transmission device  200  shown in  FIG. 27 , a length of the output member support portion  234  in the Y direction is formed to be shorter than a length of the output member support portion  234  in the Y direction shown in  FIG. 26 , and the power shaft  210  is supported by the output member support portion  234  via one inner bush  238   b.    
     In the modified example of the motive power transmission device  200 , the output member support portion  234  is disposed on the inner periphery of the end portion of the main spring  208  on the positive side in the Y direction, but the output member support portion  234  is not disposed on most of the inner periphery of the main spring  208  in the Y direction. Therefore, in the modified example, a cylindrical collar  242  is inserted into the inner periphery of the input member support portion  232 , and the main spring  208  is housed in the inner periphery of the collar  242 . The collar  242  restricts a tilt of the main spring  208 . The collar  242  corresponds to a cylindrical member of the present invention. 
     As shown in  FIGS. 26 and 27 , the housing  202 , the input cylinder  206 , the power shaft  210 , the main spring  208 , and the return spring  216  are coaxially arranged in a nested manner. In other words, the input cylinder  206  is disposed so as to overlap the power shaft  210  in the pivoting axis direction (Y direction) of the input cylinder  206  and the power shaft  210 . In addition, the main spring  208  is disposed so as to overlap the input cylinder  206  and the power shaft  210  in the pivoting axis direction (Y direction) of the input cylinder  206  and the power shaft  210 . The return spring  216  is disposed so as to overlap the input cylinder  206  and the housing  202  in the pivoting axis direction (Y direction) of the input cylinder  206  and the power shaft  210 . Further, the return spring  216  is disposed so as to overlap the main spring  208  in the pivoting axis direction (Y direction) of the input cylinder  206  and the power shaft  210 . In addition, the main spring  208  and the return spring  216  are disposed so as to overlap the input cylinder  206  and the power shaft  210  in the pivoting axis direction (Y direction) of the input cylinder  206  and the power shaft  210 . With this configuration, each member of the motive power transmission device  200  is arranged in a compact manner in the pivoting axis direction (Y direction). 
     The damper  214  is provided on a side surface of the housing  202  on the positive side in the Y direction. The damper  214  is covered by a damper cover  246 . The damper  214  includes a stator and a rotor (not shown). The stator is fixed to the housing  202 . The shaft portion  228  of the power shaft  210  penetrates the rotor of the damper  214  and is fixed to the rotor by a resin washer  248 , a metal washer  250 , and a C-shaped retaining ring  252  on the positive side in the Y direction of the rotor. As a result, the power shaft  210  and the rotor of the damper  214  rotate integrally. The stator of the damper  214  is fixed to the housing  202 , and the housing  202  is fixed to the plate  201 . When the rotor of the damper  214  fixed to the output lever  212  side rotates relative to the stator of the damper  214  fixed to the plate  201  side, a damping force acts from the damper  214  of the output lever  212  in a direction in which pivotal movement is prevented. That is, the damper  214  is disposed on the motive power transmission path between the output lever  212  and the housing  202 . The damper  214  used in the present embodiment is of a one-way type, and a damping force acts on the output lever  212  when the output lever  212  pivots from the position shown in  FIG. 22  to the back side (positive side in the Z direction), but a damping force does not act on the output lever  212  when the output lever  212  pivots in the direction of returning to the position shown in  FIG. 22 . Further, the damper  214  is provided on the positive side in the Y direction of the power shaft  210 , and the output lever  212  is provided on the negative side in the Y direction of the power shaft  210 . As a result, the damper  214  and the output lever  212  can be disposed so as to be distributed in the pivoting axis direction (Y direction) of the power shaft  210 , and the size of the motive power transmission device  200  in the radial direction (direction orthogonal to the Y direction) can be reduced. The damper  214  corresponds to a shock absorbing member of the present invention. 
     As described above, the input lever  204  and the output lever  212  are disposed on one side (negative side in the Y direction) with respect to the housing  202 . That is, in the pivoting axis direction (Y direction), the input lever  204  to which the force is input and the output lever  212  that outputs the force are disposed close to each other. With this configuration, when external force is input to the arm portion  218  of the input lever  204  in the vertical direction (negative side in the Z direction), that is, in a direction orthogonal to the pivoting axis direction, generation of a shear force (couple) in the pivoting axis direction can be reduced. In addition, the damper  214  is disposed on a side of the housing  202  opposite to a side on which the input lever  204  and the output lever  212  are disposed. That is, members through which force is input to and output from the outside of the motive power transmission device  200  may be intensively disposed on one side of the housing  202 , and the damper  214  may be disposed on the other side of the housing  202  where the members are not densely disposed. 
     As shown in  FIGS. 22 and 23 , the motive power transmission device  200  is attached to a motive power transmission device installation hole  254  formed in the plate  201 . A support portion  254   a  extending toward the inside of the motive power transmission device installation hole  254  is formed in the motive power transmission device installation hole  254 . A flange portion  202   a  extending from the housing  202  of the motive power transmission device  200  is placed on the support portion  254   a  from above (positive side in the X direction), and the motive power transmission device  200  is fixed to the plate  201  by a screw or the like (not shown). 
     In the plate  201 , a lever access hole  256  formed continuously with the motive power transmission device installation hole  254 . When the input lever  204  rotates from the position shown in  FIG. 22  to the back side, the input lever  204  passes through the lever access hole  256  and moves to the negative side in the Z direction of the plate  201 . The lever access hole  256  corresponds to a hole portion of the present invention. 
     As shown in  FIG. 24 , the arm portion  218  of the input lever  204  is provided so as to extend substantially parallel to a straight line L that passes through the pivoting axis O of the input cylinder  206  and extends in a direction in which force is input from the battery  16  to the input lever  204 . The input lever  204  also extends from a position offset with respect to the straight line L. More specifically, when viewed from the positive side in the Y-direction, the arm portion  218  of the input lever  204  extends from a position offset to the left side (negative side in the X-direction) with respect to the straight line L that passes through the pivoting axis O of the input cylinder  206  and extends in a direction in which force is input from the battery  16  to the input lever  204 . The arm portion  218  has an extension portion  218   a  extending substantially parallel to the straight line L and a curved portion  218   b  curved from the extension portion  218   a  toward the pivoting axis O. In the input lever  204 , the arm portion  218  extends parallel to the Z direction in a state in which the side surface of the arm portion  218  on the positive side in the X direction is in contact with a limit portion  256   a  at an edge of the lever access hole  256 . As a result, the force input from the battery  16  to the input lever  204  on the negative side in the Z direction acts via the input lever  204  as a force biasing toward the negative side in the Z direction at a position separated from the pivoting axis O of the input cylinder  206  in the radial direction, and the input cylinder  206  pivots together with the input lever  204 . In addition, when the side surface of the arm portion  218  of the input lever  204  on the positive side in the X direction comes into contact with the limit portion  256   a  of the lever access hole  256 , the arm portion  218  and the limit portion  256   a  come into surface contact with each other. Thus, it is possible to suppress local forces acting on the arm portion  218  and the lever access hole  256 . A plastic pad  219  is attached to a part of the arm portion  218  where the arm portion  218  and the limit portion  256   a  abut against each other. This makes it possible to suppress noise generated when the arm portion  218  and the lever access hole  256  come into contact with each other. The plastic pad  219  may be attached to the limit portion  256   a.    
     An intrusion prevention part  215  is attached to the arm portion  218  of the input lever  204  on the negative side of the X-direction. As shown in  FIG. 23 , when the plate  201  is viewed from the positive side in the Z direction, the intrusion prevention part  215  covers a part of the lever access hole  256 , and thus it is possible to restrict entry of foreign matter or the like into the lever access hole  256  or in between the lever access hole  256  and the arm portion  218  of the input lever  204 . The intrusion prevention part  215  corresponds to a cover portion of the present invention. 
       FIGS. 28A and 28B  are schematic diagrams of the motive power transmission device.  FIGS. 28A and 28B  show the housing  202 , the power shaft  210 , the output lever  212 , the damper  214 , and the damper cover  246  among the components of the motive power transmission device  200 , and other components are omitted.  FIG. 28A  is a schematic diagram of a comparative example of the motive power transmission device  200  according to the present embodiment, and illustrates a state in which the input lever  204  and the damper  214  are disposed on the same side with respect to the housing  202 . As in the present embodiment,  FIG. 28B  is a schematic diagram of a state in which the output lever  212  and the damper  214  are disposed on opposite sides of the housing  202 . 
     In the comparative example, as shown in  FIG. 28A , the power shaft  210  needs to penetrate the damper cover  246 . To restrict entry of waste or the like inside the damper cover  246 , it is necessary to provide a seal  258  between the damper cover  246  and the power shaft  210 , which results in a problem that the structure of the damper cover  246  becomes complicated. In addition, since an operation of inserting the power shaft  210  into the damper cover  246  is performed at the time of assembling the motive power transmission device  200 , ease of assembly is reduced. Further, since friction is generated between the power shaft  210  and the seal  258 , a part of the energy stored in the main spring  208  is consumed by the friction, and the power transmission efficiency of the motive power transmission device  200  decreases. 
     On the other hand, in the present embodiment, as shown in  FIG. 28B , since the output lever  212  and the damper  214  are disposed on the opposite sides of the housing  202 , there is no need to pass the power shaft  210  through the damper cover  246 . Therefore, it is possible to simplify the structure of the damper cover  246 , improve the ease of assembly of the motive power transmission device  200 , and improve the power transmission efficiency of the motive power transmission device  200 . 
       FIGS. 29A and 29B  are schematic diagrams of the motive power transmission device.  FIGS. 29A and 29B  show the housing  202 , the input lever  204 , the input cylinder  206 , the power shaft  210 , and the output lever  212  among the components of the motive power transmission device  200 , and other components are omitted.  FIG. 29A  is a schematic diagram of a comparative example of the motive power transmission device  200  according to the present embodiment, and illustrates a state in which the input lever  204  and the output lever  212  are disposed on opposite sides of the housing  202 . As in the present embodiment,  FIG. 29B  is a schematic diagram illustrates a state in which the input lever  204  and the output lever  212  are disposed on the same side with respect to the housing  202 . 
     In the comparative example, as shown in  FIG. 29A , one end side of the power shaft  210  is supported by the input cylinder  206  via an inner bush  260 . The other end side of the power shaft  210  is supported by a bearing of a rotor (not shown) of the damper  214 . Since the input cylinder  206  is supported by the input member support portion  232  of the housing  202  via the outer bush  236 , the power shaft  210  is finally supported by the input member support portion  232  of the housing  202 . For this reason, the load on each support portion of the power shaft  210  is large, the deflection of the axis of the power shaft  210  is large, and there is a concern that the durability of the motive power transmission device  200  may deteriorate. 
     On the other hand, in the present embodiment, as shown in the drawing  29 B, one end side of the power shaft  210  is supported by the output member support portion  234  of the housing  202  via the inner bushes  238   a  and  238   b . The other end side of the power shaft  210  is supported by a bearing of a rotor (not shown) of the damper  214 . That is, since the power shaft  210  is supported by the output member support portion  234  of the housing  202  via the two inner bushes  238   a  and  238   b , the load on each support portion of the power shaft  210  can be reduced, the axial deflection of the power shaft  210  is reduced, and the durability of the motive power transmission device  200  can be improved. 
       FIGS. 30A to 30D  show dynamic equivalent models of the motive power transmission device.  FIGS. 30A to 30D  are diagrams modeling the housing  202 , the input lever  204  (input cylinder  206 ), the output lever  212  (power shaft  210 ), the main spring  208 , the return spring  216 , and the damper  214 . 
       FIG. 30A  shows an initial state of the motive power transmission device  200 . The initial state refers to a state in which the input lever  204  is placed at the position shown in  FIG. 22 . In an initial state, in the input lever  204 , a side surface of the arm portion  218  on the positive side in the X direction is in contact with an edge of the lever access hole  256 . In  FIGS. 30A to 30D , the position of the input lever  204  in the initial state is indicated by P 1 , and the position of the output lever  212  is indicated by Q 1 . In the initial state, a preload is applied to the main spring  208  and the return spring  216 . There is a region for play on the main spring  208  and the return spring  216 , from their natural length states until they are deformed and elastic force is generated. For example, when no preload acts on the return spring  216 , the input lever  204  has a backlash and its position is not fixed. In the initial state, the input lever  204  can be positioned by preloading the main spring  208  and the return spring  216 . 
       FIG. 30B  shows a state of the motive power transmission device  200  immediately after force has been input from outside to tilt the input lever  204 . In  FIGS. 30A to 30D , the side on which the input lever  204  is tilted is shown as the right side. When a force is input to the input lever  204 , the input lever  204  moves to the right side. At this time, the return spring  216  is deformed, and energy is stored in the return spring  216 . Since the force input to the input lever  204  is transmitted to the output lever  212  via the main spring  208 , the output lever  212  also moves to the right side as the input lever  204  moves. In  FIGS. 30A to 30D , the position of the input lever  204  immediately after force has been input to the input lever  204  is indicated by P 2 , and the position of the output lever  212  is indicated by Q 2 . 
     The damper  214  provided between the output lever  212  and the housing  202  generates a larger damping force in a direction in which the movement of the output lever  212  is prevented, as the temporal change of the force input to the output lever  212  is larger. Therefore, immediately after the force starts to be transmitted from the main spring  208  to the output lever  212 , the amount of movement of the output lever  212  is smaller than the amount of movement of the input lever  204 , the main spring  208  deforms, and energy is stored in the main spring  208 . Since energy is stored in the main spring  208 , a force input to the input lever  204  does not directly act on the damper  214 , and an impact input to the damper  214  can be reduced. 
       FIG. 30C  shows the state of the motive power transmission device  200  after a lapse of time from the input of force from the outside to tilt the input lever  204 . When time elapses after the force is input to the input lever  204 , the damping force of the damper  214  gradually decreases and the elastic force of the main spring  208  increases, so that the energy stored in the main spring  208  is released and the output lever  212  moves to the right side at a low speed. In  FIGS. 30A to 30D , the position of the input lever  204  is indicated in P 2  and the position of the output lever  212  is indicated in Q 3 , after a lapse of time from the input of force to the input lever  204 . 
     That is, even if a large force acts on the input lever  204  in a short time, the motive power transmission device  200  attenuates the input force and outputs the attenuated force from the output lever  212 . As a result, the connector unit  262  connected to the output lever  212  moves upward (the positive side in the Z direction) at a low speed together with the output lever  212 , and the impact at the time of fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272  can be reduced. 
       FIG. 30D  shows the state of the motive power transmission device  200  when there is no external force input to the input lever  204 . When no force is input to the input lever  204 , the input lever  204 , the main spring  208 , and the output lever  212  move integrally to their initial positions by the restoring force of the return spring  216 . Since the damper  214  is a one-way type, the damper  214  does not generate a damping force when the output lever  212  returns to the position in the initial state. 
     The displacements of the respective members shown in the order of  FIG. 30A ,  FIG. 30B ,  FIG. 30C , and  FIG. 30D  ( FIG. 30A → FIG. 30B → FIG. 30C → FIG. 30D ) are those in the case where the speed at which the input lever  204  is displaced is slightly high. When the speed at which the input lever  204  is displaced is low, the damper  214  generates little damping force and the main spring  208  is not deformed, so that the members are displaced in the order of  FIG. 30A ,  FIG. 30C , and  FIG. 30D  ( FIG. 30A → FIG. 30C → FIG. 30D ). On the other hand, when the speed at which the input lever  204  is displaced is high, the damper  214  generates a large damping force. Therefore, in the state shown in  FIG. 30B , the output lever  212  hardly moves and shifts to the state shown in  FIG. 30C . 
     The spring constant of the return spring  216  may be set to a value such that the motive power transmission device  200  can be returned to the initial state when no force is input from outside to the input lever  204 . Therefore, it is set to be as small as possible relative to the spring constant of the main spring  208 . 
     As shown in  FIGS. 22, 23, and 25 to 27 , the connector unit  262  includes a connector holder  264  and the connector  266 . The connector  266  supports the casing-side connection terminal  274 . The connector holder  264  is supported by the two poles  268   a  and  268   b  extending from the plate  201  to the negative side in the Z direction so as to be movable in the vertical direction (Z direction). The poles  268   a  and  268   b  are arranged asymmetrically with respect to the center of the connector holder  264  when the connector holder  264  is viewed from above (the positive side in the Z direction). A C-shaped retaining ring  269  is provided at an end of each of the poles  268   a  and  268   b  on the negative side in the Z direction. The connector holder  264  is prevented from coming off from the pole  268   a  and  268   b  by the C-shaped retaining ring  269 . An elongate hole  270  extending in the X direction is formed in a side surface of the connector holder  264  facing the motive power transmission device  200 . The roller  224  of the output lever  212  is inserted into the elongate hole  270 . 
       FIG. 31  is a cross-sectional view of the connector unit.  FIG. 31  shows a state in which the battery-side connection terminal  272  provided on the bottom surface of the battery  16  are connected to the casing-side connection terminal  274 . 
     The casing-side connection terminal  274  includes a pair of high-voltage terminal pins  278  that can be fitted and connected to high-voltage terminals  276  of the battery-side connection terminal  272 , and a plurality of signal terminal pins  282  that can be fitted and connected to signal terminals  280  of the battery-side connection terminal  272 . The high-voltage terminal pins  278  and the signal terminal pins  282  are provided so as to extend toward the battery  16  side (positive side in the Z direction). The high-voltage terminal pins  278  and the signal terminal pins  282  are arranged in a line in the X direction. The high-voltage terminal pins  278  are respectively disposed outside the signal terminal pins  282 . The distal ends of the high-voltage terminal pins  278  are located closer to the battery  16  (positive side in the Z direction) than the distal ends of the signal terminal pins  282  are. Therefore, when the casing-side connection terminal  274  is connected to the battery-side connection terminal  272 , the high-voltage terminal pins  278  are connected to the battery-side connection terminal  272  before the signal terminal pins  282  are connected. 
     The connector  266  has guide protrusions  286  that can be fitted and connected to guide holes  284  formed in the bottom surface of the battery  16 . The guide protrusions  286  are provided in pairs on both outer sides in the X direction of the casing-side connection terminal  274 . The guide protrusions  286  are provided to extend toward the battery  16  side (the positive side in the Z direction). Each of the guide protrusions  286  is formed in a substantially cylindrical shape as a whole, and a distal end portion thereof is provided with a spherical or tapered surface. The distal ends of the guide protrusions  286  are located closer to the battery  16  (positive side in the Z direction) than the high-voltage terminal pins  278  and the signal terminal pins  282  are. Therefore, when the casing-side connection terminal  274  is connected to the battery-side connection terminal  272 , the guide protrusions  286  are connected to the guide holes  284  before the high-voltage terminal pins  278  and the signal terminal pins  282  are connected to the battery-side connection terminal  272 . 
     The connector  266  includes a terminal holding portion  288  on which the casing-side connection terminal  274  is provided, and a flange portion  290  extending to the outer peripheral side of the terminal holding portion  288 . The terminal holding portion  288  is inserted into a through hole  292  of the connector holder  264 , and is prevented from being detached from the connector holder  264  by the flange portion  290 . The connector  266  is supported by the connector holder  264  via a pair of coupling pins  294  so as to be relatively movable in the vertical direction (Z direction). The coupling pins  294  are inserted into through holes  296  formed in the connector holder  264  and through holes  297  formed in the flange portion  290  of the connector holder  264 . A head portion  294   a  of an upper portion (end portion on the positive side in the Z-direction) of the coupling pin  294  is formed to have a larger diameter than the through hole  296  of the connector holder  264 , and the coupling pin  294  is prevented from coming off from the connector holder  264  by the head portion  294   a.    
     The coupling pin  294  is provided with a spring unit  298  that biases the flange portion  290  of the connector  266  toward the battery  16  side (positive side in the Z direction). The spring unit  298  includes a case  300 , a stopper plate  302 , and a coil spring  304 . The case  300  is formed in a bottomed cylindrical shape, and a through hole  306   a  into which the coupling pin  294  is inserted is formed in a bottom portion  306 . The stopper plate  302  is a circular plate-shaped member whose outer dimension is substantially the same as the outer dimension of the case  300 , and the coupling pin  294  is inserted into a through-hole  302   a  at the central portion of the stopper plate  302 . The stopper plate  302  is retained with respect to the coupling pin  294  by a C-shaped retaining ring  308 . The coil spring  304  is provided between the case  300  and the bottom portion of the stopper plate  302 , with the coupling pin  294  inserted into the inner periphery thereof. 
     With such a configuration, the connector holder  264  and the connector  266  integrally move upward (positive side in the Z direction) until the fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272  is completed. When the fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272  is completed and the side surface of the terminal holding portion  288  on the battery  16  side comes into contact with the bottom surface of the battery  16 , the movement of the connector  266  is limited, and as shown in  FIG. 31 , the connector  266  moves downward (negative side in the Z direction) relative to the connector holder  264 . 
       FIGS. 32A to 32E  are dynamic equivalent models of the connector unit.  FIGS. 32A to 32E  are diagrams in which the battery-side connection terminal  272 , the casing-side connection terminal  274 , the coil spring  304 , the connector  266 , and the connector holder  264  are modeled. 
       FIG. 32A  shows a state of the connector unit  262  before the casing-side connection terminal  274  and the battery-side connection terminal  272  are fitted to each other. An upward (positive side in the Z direction) force is input to the connector holder  264  from the output lever  212  of the motive power transmission device  200 . The force input to the connector holder  264  is transmitted to the connector  266  via the coil spring  304 , and the connector holder  264  and the connector  266  integrally move upward. 
       FIG. 32B  shows a state of the connector unit  262  during fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272 . During the fitting, the casing-side connection terminal  274 , the connector  266 , and the connector holder  264  integrally move upward. 
       FIG. 32C  shows a state of the connector unit  262  at the completion of fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272 . Until the fitting is completed, the casing-side connection terminal  274 , the connector  266 , and the connector holder  264  integrally move upward. 
       FIG. 32D  shows a state of the connector unit  262  during pre-compression of the coil spring  304  after completion of fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272 . During the pre-compression, the casing-side connection terminal  274  and the connector  266  do not move, and the connector holder  264  moves upward. As a result, the coil spring  304  is compressed, and the load pressing the casing-side connection terminal  274  toward the battery-side connection terminal  272  increases. 
       FIG. 32E  shows a state of the connector unit  262  when the pre-compression of the coil spring  304  is completed. The connector holder  264  stops at a position where the pre-compression of the coil spring  304  is completed. At this time, the casing-side connection terminal  274  comes to a state in which the casing-side connection terminal  274  is pressed toward the battery-side connection terminal  272  with a sufficient force. Thus, even if the battery  16  slightly moves upward (positive side in the Z direction) in the containment chamber  14 , the connector  266  follows the movement of the battery  16 , so that the fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272  is not disengaged. 
     Assuming that the pressing force of the coil spring  304  to the casing-side connection terminal  274  by the coil spring is indicated as F 1  in the initial state, F 2  during fitting of the casing-side connection terminal  274  and the battery-side connection terminal  272 , F 3  at the completion of the fitting, F 4  during pre-compression of the coil spring  304 , and F 5  at the completion of pre-compression, these have the relationship: F 1 &lt;F 2 ≈F 3 &lt;F 4 &lt;F 5 . 
     The above describes a preferred embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and various modifications could be adopted therein without departing from the essence and gist of the present invention. 
     For example, in the above embodiment, an example is described of a case in which the ventilation paths  36 A,  36 C,  36 D, and  36 F are intake paths and the ventilation path  36 E is an exhaust path, but the present invention is not limited to this. For example, the ventilation paths  36 A,  36 C,  36 D, and  36 F may be exhaust paths and the ventilation path  36 E may be an intake path. In this case, the blower  52  sends air from the left side to the right side in  FIGS. 12A and 12B . 
     In the above-described embodiment, an example is described of a case in which the charging power supply device  10  is capable of charging the battery  16  and supplying electric power stored in the battery  16  to an external device, but the present invention is not limited to this. For example, the charging power supply device  10  may charge the battery  16  but need not necessarily be capable of outputting the power stored in the battery  16  to an external device. Further, the charging power supply device  10  may be capable of supplying power stored in the battery  16  to an external device, but need not necessarily be capable of charging the battery  16 . That is, the charging power supply device  10  can mean not only a device capable of performing both charging and supplying power but also a device capable of performing only charging or a device capable of performing only supplying power. 
     Further, in the above-described embodiment, an example is described of a case in which the casing  12  is applied to the charging power supply device  10 , but the present invention is not limited to this. The casing  12  can be applied to any device other than the charging power supply device  10 . For example, the casing  12  may be applied to a personal computer or the like. 
     In addition, in the above-described embodiment, the input lever  204 , the input member of the input cylinder  206 , the output lever  212 , and the output member of the power shaft  210  perform pivotal movement, but the input member and the output member may be configured to perform translational movement. 
     Further, in the above-described embodiment, torsion springs are used as the main spring  208  and the return spring  216 . However, other springs such as coil springs may be used in a case where the input member and the output member perform translational movement. 
     Further, in the above-described embodiment, the motive power transmission device  200  is used as a device that transmits a force acting on the motive power transmission device  200  from the battery  16  to the connector unit  262  and that moves the connector unit  262  toward the battery  16  side. In contrast, the motive power transmission device  200  may be used as a shock absorber that absorbs a shock when the battery  16  is contained in the containment chamber  14 . When the motive power transmission device  200  is used as a shock absorber, the motive power transmission device  200  need not necessarily have a function of moving the connector unit  262  toward the battery  16  side. In this case, the connector unit  262  may be fixed to the positive side of the plate  201  in the Z direction. Alternatively, a device for moving the connector unit  262  to the battery  16  side may be separately provided. When the motive power transmission device  200  is used as a shock absorber, the motive power transmission device  200  may have a structure that includes the input lever  204 , the input cylinder  206 , the main spring  208 , and the return spring  216 , but does not include the power shaft  210 , the output lever  212 , or the damper  214 . 
     The following is a summary of the embodiments described above. 
     The motive power transmission device includes the first member, the second member, and the third member that are movable relatively to each other and mechanically connected so as to transmit motive power to each other, and the motive power transmission device includes the first elastic member disposed on a first motive power transmission path that is a motive power transmission path between the first member and the second member, the second elastic member disposed on a second motive power transmission path that is a motive power transmission path between the first member and the third member, and the buffer member disposed on a third motive power transmission path that is a motive power transmission path between the second member and the third member. According to such a configuration, transmission of excessive external force can be suppressed. 
     Each of the first member and the second member may be provided pivotably. According to such a configuration, the motive power transmission device can be made compact. 
     The pivoting axis of the first member and the pivoting axis of the second member may be disposed on the same straight line. According to such a configuration, the motive power transmission device can be made compact. 
     The first elastic member may have elasticity in a pivoting direction of the first member and a pivoting direction of the second member, and may be disposed on the same straight line as the pivoting axis of the first member and the pivoting axis of the second member. According to such a configuration, the motive power transmission device can be made compact. 
     The first elastic member may be disposed so as to overlap with the first member and the second member in the direction of the pivoting axis of the first member and the direction of the pivoting axis of the second member. According to such a configuration, the motive power transmission device can be made compact. 
     REFERENCE SIGNS LIST 
     
         
           200 : motive power transmission device 
           202 : housing 
           204 : input lever 
           208 : main spring 
           212 : output lever 
           214 : damper 
           216 : return spring