Patent Publication Number: US-2023136544-A1

Title: Drive apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present invention claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2021-178102 filed on Oct. 29, 2021, the entire content of which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present invention relates to a drive apparatus. 
     BACKGROUND 
     In recent years, the development of drive apparatuses to be mounted on electric vehicles has been actively carried out. Such a drive apparatus needs to lubricate gears, bearings, and the like. There is a structure in which a catch tank that stores lubricating oil is provided in an upper portion of a case, and the lubricating oil is dropped from a hole in a bottom portion of the catch tank toward an object to be lubricated. 
     When the catch tank is provided inside the housing, there is a problem that the drive apparatus is increased in size in order to secure a space for accommodating the catch tank. 
     SUMMARY 
     One aspect of an exemplary drive apparatus of the present invention includes: a motor having a rotor rotating about a motor axis and a stator surrounding the rotor; a transmission mechanism that has a plurality of gears and transmits power of the motor; a housing having a motor accommodating portion that accommodates the motor and a gear accommodating portion that accommodates the transmission mechanism; a fluid stored in the housing; and a flow path through which the fluid flows. The housing has a side wall portion that defines an internal space of the motor accommodating portion and an internal space of the gear accommodating portion. The flow path includes an intra-housing flow path disposed in an internal space of the motor accommodating portion and provided with a feed hole for ejecting a fluid. A bearing holder that supports the shaft of the transmission mechanism via a bearing is provided on a gear facing surface of the side wall portion facing the transmission mechanism. The feed hole faces the bearing via an opening provided in the side wall portion. 
     The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a conceptual view of a drive apparatus of an embodiment; 
         FIG.  2    is a perspective view of a bearing and a bearing holder disposed around an output axis J 3  in the drive apparatus according to an embodiment; 
         FIG.  3    is a front view of a gear cover according to an embodiment; 
         FIG.  4    is a cross-sectional view of the drive apparatus according to an embodiment; 
         FIG.  5    is a partial cross-sectional view of a drive apparatus according to a modification; 
         FIG.  6    is a front view of the housing body according to the embodiment when viewed from a gear accommodating portion side; 
         FIG.  7    is a cross-sectional view of the housing body taken along line VII-VII of  FIG.  6   ; 
         FIG.  8    is a perspective view of a flow path member of an embodiment; 
         FIG.  9    is a schematic view of a flow path member of a modification; 
         FIG.  10    is a schematic cross-sectional view of a drive apparatus  101  of Modification 1; and 
         FIG.  11    is a schematic cross-sectional view of a drive apparatus  201  according to Modification 2. 
     
    
    
     DETAILED DESCRIPTION 
     The description below will be made with the direction of gravity being specified based on a positional relationship in a case where the drive apparatus  1  is mounted in a vehicle located on a horizontal road surface. In the drawings, an XYZ coordinate system is shown appropriately as a three-dimensional orthogonal coordinate system. 
     In the XYZ coordinate system, a Z-axis direction corresponds to a vertical direction (i.e., an up-down direction), and a +Z direction points upward (i.e., in a direction opposite to the direction of gravity), while a −Z direction points downward (i.e., in the direction of gravity). 
     The X-axis direction is a direction orthogonal to the Z-axis direction and indicates the front-rear direction of the vehicle on which the drive apparatus  1  is mounted. The −X direction is the front of the vehicle (one side in the front-rear direction), and the +X direction is the rear of the vehicle (the other side in the front-rear direction). Note, however, that the +X direction and the −X direction may point forward and rearward, respectively, of the vehicle. A Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is a width direction (right-left direction) of the vehicle. 
     In the description below, unless otherwise specified, a direction (i.e., the Y-axis direction) parallel to a motor axis J 1  will be simply referred to by the term “axial direction”, “axial”, or “axially”, radial directions around the motor axis J 1  will be simply referred to by the term “radial direction”, “radial”, or “radially”, and a circumferential direction around the motor axis J 1 , i.e., a circumferential direction about the motor axis J 1 , will be simply referred to by the term “circumferential direction”, “circumferential”, or “circumferentially”. Note, however, that the term “parallel” as used above includes both “parallel” and “substantially parallel”. 
       FIG.  1    is a conceptual view of a drive apparatus  1  of the present embodiment. Note that the relative positional relationship in the up-down direction (Z-axis direction) of each part in  FIG.  1    may be different from the actual positional relationship along with the schematic illustration. In particular, in  FIG.  1   , an intermediate axis J 2  and an output axis J 3  are illustrated with their positions reversed from each other in the up-down direction. 
     The drive apparatus  1  according to the present embodiment is mounted in a vehicle having a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), and an electric vehicle (EV), and is used as a power source of the vehicle. 
     The drive apparatus  1  includes a motor  2 , a transmission mechanism  3 , an inverter  7 , a housing  6 , a fluid O stored in the housing  6 , a pump  8 , a cooler  9 , a plurality of bearings  5 A,  5 B,  5 C,  5 D,  5 E,  5 F,  5 G, and  5 H, a flow path  90 , a refrigerant L, and a refrigerant flow path  70 . 
     The housing  6  includes a motor accommodating portion  81  that accommodates the motor  2 , a gear accommodating portion  82  that accommodates the transmission mechanism  3 , and an inverter accommodating portion  89  that accommodates the inverter  7 . The gear accommodating portion  82  is located on the other side (−Y side) in the axial direction of the motor accommodating portion  81 . The inverter accommodating portion  89  is located above the motor accommodating portion  81 . 
     The motor  2  of the present embodiment is an inner rotor type three-phase AC motor. The motor  2  has both a function as an electric motor and a function as a generator. 
     The motor  2  includes a rotor  20  arranged to rotate about the motor axis J 1 , which extends in a horizontal direction, and a stator  30  arranged radially outside of the rotor  20 . The motor  2  of the present embodiment is an inner rotor type motor in which the rotor  20  is disposed inside the stator  30 . 
     The stator  30  encloses the rotor  20  from radially outside. The stator  30  has a stator core  32 , a coil  31 , and an insulator (not illustrated) interposed between the stator core  32  and the coil  31 . The stator  30  is held by the housing  6 . 
     The rotor  20  rotates about the motor axis J 1  extending in the horizontal direction. The rotor  20  includes a motor shaft  21 A, a rotor core  24  fixed to an outer peripheral surface of the motor shaft  21 A, and a rotor magnet (not illustrated) fixed to the rotor core. The torque of the rotor  20  is transferred to the transmission mechanism  3 . 
     The motor shaft  21 A extends along the axial direction about the motor axis J 1 . The motor shaft  21 A rotates about the motor axis J 1 . The motor shaft  21 A is a shaft having a hollow portion extending in the axial direction. The motor shaft  21 A is rotatably supported by the housing  6  via bearings  5 C and  5 D. 
     The stator  30  is held by the housing  6 . The stator  30  encloses the rotor  20  from radially outside. The stator  30  includes the annular stator core  32  centered on the motor axis J 1 , the coil  31  mounted on the stator core  32 , and an insulator (not illustrated) interposed between the stator core  32  and the coil  31 . The stator core  32  has a plurality of magnetic pole teeth (not illustrated) radially inward from an inner peripheral surface of an annular yoke. A coil wire is disposed between the magnetic pole teeth. The coil wire located in the gap between the adjacent magnetic pole teeth constitutes the coil  31 . The insulator is made of an insulating material. 
     The transmission mechanism  3  transmits power of the motor  2  and outputs the power to an output shaft  55 . The transmission mechanism  3  includes a reduction gear  3   a  and a differential device  3   b.  The torque output from the motor  2  is transmitted to the differential device  3   b  via the reduction gear  3   a.  The reduction gear  3   a  is a speed reducer of a parallel-axis gearing type, in which center axes of gears are disposed in parallel with each other. The differential device  3   b  transmits the same torque to the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. 
     The transmission mechanism  3  includes a first shaft (shaft)  21 B, a second shaft (shaft)  45 , a first gear  41 , a second gear  42 , and a third gear  43 . The differential device  3   b  includes a ring gear  51 , a differential case  50 , and a differential mechanism  50   c  disposed inside the differential case  50 . That is, the transmission mechanism  3  includes the first shaft  21 B, the second shaft  45 , the plurality of gears  41 ,  42 ,  43 , and  51 , the differential case  50 , and the differential mechanism  50   c.    
     The first shaft  21 B extends in the axial direction about the motor axis J 1 . The first shaft  21 B is disposed coaxially with the motor shaft  21 A. The first shaft  21 B is coupled to the end portion on the other side (−Y side) in the axial direction of the motor shaft  21 A in the end portion on one side (+Y side) in the axial direction. As a result, the first shaft  21 B is coupled to the rotor  20  from the other side in the axial direction. 
     The outer diameter of the end portion on one side (+Y side) in the axial direction of the first shaft  21 B is smaller than the inner diameter of the end portion on the other side (−Y side) in the axial direction of the motor shaft  21 A. Splines meshing with each other are provided on an outer peripheral surface of an end portion on one side (+Y side) in the axial direction of the first shaft  21 B and an inner peripheral surface of an end portion on the other side (−Y side) in the axial direction of the motor shaft  21 A. 
     In the present embodiment, the case where the shafts are coupled by inserting the end portion of the first shaft  21 B into the hollow portion of the end portion of the motor shaft  21 A has been described. However, a configuration in which the end portion of the motor shaft  21 A is inserted into the hollow portion of the end portion of the first shaft  21 B to be coupled may be adopted. In this case, splines that mesh with each other are provided on the outer peripheral surface of the end portion of the motor shaft  21 A and the inner peripheral surface of the end portion of the first shaft  21 B. 
     The first shaft  21 B rotates around the motor axis J 1  together with the motor shaft  21 A. The first shaft  21 B is a hollow shaft having a hollow portion therein. The first shaft  21 B is rotatably supported by the housing  6  via the bearings  5 A and  5 B. 
     The first gear  41  is provided on the outer peripheral surface of the first shaft  21 B. The first gear  41  rotates about the motor axis J 1  together with the first shaft  21 B. The second shaft  45  rotates about the intermediate axis J 2  parallel to the motor axis J 1 . The second gear  42  and the third gear  43  are disposed side by side in the axial direction. The second gear  42  and the third gear  43  are provided on the outer peripheral surface of the second shaft  45 . The second gear  42  and the third gear  43  are connected via the second shaft  45 . The second gear  42  and the third gear  43  rotate about the intermediate axis J 2 . The second gear  42  meshes with the first gear  41 . The third gear  43  meshes with the ring gear  51  of the differential device  3   b.    
     The ring gear  51  rotates about the output axis J 3  parallel to the motor axis J 1 . The torque outputted from the motor  2  is transferred to the ring gear  51  through the reduction gear  3   a.  The ring gear  51  is fixed to the differential case  50 . 
     The differential case  50  includes a case portion  50   b  that accommodates the differential mechanism  50   c  therein, and a differential case shaft (shaft)  50   a  that protrudes to one side and the other side in the axial direction with respect to the case portion  50   b.  That is, the transmission mechanism  3  includes the differential case shaft  50   a.  The differential case shaft  50   a  has a tubular shape extending along the axial direction around the output axis J 3 . The ring gear  51  is provided on the outer peripheral surface of the differential case shaft  50   a.  The differential case shaft  50   a  rotates together with the ring gear  51  about the output axis J 3 . 
     The pair of output shafts  55  is connected to the differential device  3   b.  The pair of output shafts  55  protrudes from the differential case  50  of the differential device  3   b  to one side and the other side in the axial direction. The output shaft  55  is disposed inside the differential case shaft  50   a.  The output shaft  55  is rotatably supported on the inner peripheral surface of the differential case shaft  50   a  via a bearing (not illustrated). 
     The torque output from the motor  2  is transmitted to the ring gear  51  of the differential device  3   b  via the first shaft  21 B, the first gear  41 , the second gear  42 , the second shaft  45 , and the third gear  43  of the transmission mechanism  3 , and is output to the output shaft  55  via the differential mechanism  50   c  of the differential device  3   b.  The plurality of gears ( 41 ,  42 ,  43 ,  51 ) of the transmission mechanism  3  transmits power of the motor  2  through the first shaft  21 B, the second shaft  45 , and the differential case shaft  50   a  in this order. 
     The housing  6  includes a housing body  6 B, a motor cover  6 A, a gear cover  6 C, and an inverter cover  6 D. The housing body  6 B, the motor cover  6 A, the gear cover  6 C, and the inverter cover  6 D are separate members. The motor cover  6 A is disposed on one side (+Y side) in the axial direction of the housing body  6 B. The gear cover  6 C is disposed on the other side (−Y side) in the axial direction of the housing body  6 B. The inverter cover  6 D is disposed on the upper side of the housing body  6 B. 
     The housing  6  includes the motor accommodating portion  81 , the gear accommodating portion  82 , and the inverter accommodating portion  89 . The motor accommodating portion  81 , the gear accommodating portion  82 , and the inverter accommodating portion  89  are configured by respective portions of the housing body  6 B, the motor cover  6 A, the gear cover  6 C, and the inverter cover  6 D. 
     The motor accommodating portion  81  includes a cylindrical portion of the housing body  6 B and the motor cover  6 A that covers an opening on one side (+Y side) in the axial direction of the cylindrical portion. The motor  2  is disposed in a space surrounded by the housing body  6 B and the motor cover  6 A. 
     The gear accommodating portion  82  includes a recessed portion that opens to the other side (−Y side) in the axial direction of the housing body  6 B and the gear cover  6 C that covers the opening of the recessed portion. The transmission mechanism  3  is disposed in a space surrounded by the housing body  6 B and the gear cover. 
     The inverter accommodating portion  89  includes a box-shaped portion opened to the upper side of the housing body  6 B and the inverter cover  6 D covering the opening of the box-shaped portion. The inverter  7  is disposed in a space surrounded by the housing body  6 B and the inverter cover  6 D. 
     The housing  6  includes a first side wall portion  6   a,  a second side wall portion (side wall portion)  6   b,  and a third side wall portion  6   c  which extend along a plane orthogonal to the motor axis J 1 , a motor peripheral wall portion  6   d  surrounding the motor  2  from radially outside, and a gear peripheral wall portion  6   e  surrounding the transmission mechanism  3  from radially outside. 
     The first side wall portion  6   a  is provided on the motor cover  6 A. The first side wall portion  6   a  constitutes a part of the motor accommodating portion  81 . The first side wall portion  6   a  is located on one side (+Y side) in the axial direction of the motor  2 . 
     The second side wall portion  6   b  is provided in the housing body  6 B. The second side wall portion  6   b  is located on the other side (−Y side) in the axial direction of the motor  2 . The second side wall portion  6   b  defines an internal space of the motor accommodating portion  81  and an internal space of the gear accommodating portion  82 . The second side wall portion  6   b  constitutes a part of the motor accommodating portion  81  and the gear accommodating portion  82 . 
     The second side wall portion  6   b  has a vertical wall region  6   k  extending along the axial direction. The vertical wall region  6   k  faces the radial inside of the output axis J 3 . The second side wall portion  6   b  is configured in a stepped shape in which a region close to the output axis J 3  is disposed on one side in the axial direction with respect to a region far from the vertical wall region  6   k  as a boundary. The vertical wall region  6   k  expands the internal space of the gear accommodating portion  82  around the output axis J 3  to one side (+Y side) in the axial direction. Since the vertical wall region  6   k  is provided in the second side wall portion  6   b,  a space in which the differential device  3   b  is disposed in the gear accommodating portion  82  can be secured to be wider in the axial direction than other regions. 
     The second side wall portion  6   b  is provided with a shaft passing hole  6   s  and a through hole  6   h.  The shaft passing hole  6   s  allows the internal spaces of the motor accommodating portion  81  and the gear accommodating portion  82  to communicate with each other. In the shaft passing hole  6   s,  the bearing  5 C supporting the motor shaft  21 A and the bearing  5 B supporting the first shaft  21 B are disposed. The motor shaft  21 A and the first shaft  21 B are coupled to each other inside the shaft passing hole  6   s.    
     The through hole  6   h  is provided in the vertical wall region  6   k  of the second side wall portion  6   b.  Therefore, the through hole  6   h  penetrates the second side wall portion  6   b  in the radial direction of the output axis J 3 . The through hole  6   h  allows the internal space of the motor accommodating portion  81  and the internal space of the gear accommodating portion  82  to communicate with each other. 
     The third side wall portion  6   c  is provided on the gear cover  6 C. The third side wall portion  6   c  constitutes a part of the gear accommodating portion  82 . The third side wall portion  6   c  is disposed on the other side (−Y side) in the axial direction of the transmission mechanism  3 . 
     The motor peripheral wall portion  6   d  is provided in the housing body  6 B. The motor peripheral wall portion  6   d  constitutes a part of the motor accommodating portion  81 . The motor peripheral wall portion  6   d  has a tubular shape extending along the axial direction around the motor axis J 1 . The motor peripheral wall portion  6   d  connects the second side wall portion  6   b  and the first side wall portion  6   a.  The motor peripheral wall portion  6   d  surrounds the outer periphery of the motor  2  from the radial outside of the motor axis J 1 . 
     The gear peripheral wall portion  6   e  is configured by a part of the housing body  6 B and a part of the gear cover  6 C. The gear peripheral wall portion  6   e  constitutes a part of the gear accommodating portion  82 . The gear peripheral wall portion  6   e  extends along the axial direction. The gear peripheral wall portion  6   e  connects the third side wall portion  6   c  and the second side wall portion  6   b.  The gear peripheral wall portion  6   e  surrounds the gears  41 ,  42 ,  43 , and  51  from the radial outside of the motor axis J 1 , the intermediate axis J 2 , and the output axis J 3 . 
     The plurality of bearings  5 A,  5 B,  5 C,  5 D,  5 E,  5 F,  5 G, and  5 H are held by the housing  6 , and rotatably support any one of the motor shaft  21 A, the first shaft  21 B, the second shaft  45 , and the differential case shaft  50   a.    
     The motor shaft  21 A is supported by the bearings  5 C and  5 D. The bearing  5 C is disposed inside the shaft passing hole  6   s  provided in the second side wall portion  6   b  and is held by the second side wall portion  6   b.  The bearing  5 D is held by the first side wall portion  6   a.  The first side wall portion  6   a  is provided with a bearing holder  60 D that holds the bearing  5 D. 
     The first shaft  21 B is supported by the bearings  5 A and  5 B. The bearing (second bearing)  5 A is held by the third side wall portion  6   c.  The third side wall portion  6   c  is provided with a bearing holder (second bearing holder)  60 A that holds the bearing  5 A. That is, the bearing holder  60 A supports the shaft (first shaft  21 B) of the transmission mechanism  3  via the bearing  5 A. The bearing  5 B is disposed inside the shaft passing hole  6   s  provided in the second side wall portion  6   b  and is held by the second side wall portion  6   b.    
     The second shaft  45  is supported by the bearings  5 E and  5 F. The bearing  5 E is held by the third side wall portion  6   c.  The third side wall portion  6   c  is provided with a bearing holder  60 E that holds the bearing  5 E. The bearing (first bearing)  5 F is held by the second side wall portion  6   b.  The second side wall portion  6   b  is provided with a bearing holder (first bearing holder)  60 F that holds the bearing  5 F. That is, the bearing holder  60 F supports the shaft (second shaft  45 ) of the transmission mechanism  3  via the bearing  5 F. 
     The differential case shaft  50   a  is supported by the bearings  5 G and  5 H. The bearing  5 G is held by the third side wall portion  6   c.  The third side wall portion  6   c  is provided with a bearing holder  60 G that holds the bearing  5 G. The bearing  5 H is held by the second side wall portion  6   b.  The second side wall portion  6   b  is provided with a bearing holder  60 H that holds the bearing  5 H. The bearing holder  60 H is provided on a first gear facing surface (gear facing surface)  6   p  facing the transmission mechanism  3  of the second side wall portion  6   b.  The bearing holder  60 H supports the differential case shaft  50   a  via the bearing  5 H. 
       FIG.  2    is a perspective view of the bearing  5 H and the bearing holder  60 H. 
     As illustrated in  FIG.  2   , the bearing holder  60 H has a cylindrical portion  6   f  surrounding the bearing  5 H. The cylindrical portion  6   f  has a cylindrical shape centered on the output axis J 3 . The cylindrical portion  6   f  protrudes in the axial direction from a surface facing the other side (−Y side) in the axial direction of the second side wall portion  6   b.    
     The cylindrical portion  6   f  is provided with a notch (opening)  6   g  extending in the axial direction from the tip. Therefore, the bearing  5 H is exposed radially outward of the output axis J 3  in the notch  6   g.  The notch  6   g  is provided in a portion of the cylindrical portion  6   f  disposed on the vehicle front side (−X side, one side in front-rear direction) with respect to the output axis J 3 . A portion of the cylindrical portion  6   f  where the notch  6   g  is provided faces the vertical wall region  6   k  of the second side wall portion  6   b.  As described above, the through hole (opening)  6   h  is provided in the vertical wall region  6   k.  The notch  6   g  and the through hole  6   h  are disposed side by side in the radial direction of the output axis J 3 . 
     The fluid O accumulates in the housing  6 . The fluid O circulates in the flow path  90  described later. In the present embodiment, the fluid O is oil. The fluid O is used not only for cooling the motor  2  but also for lubricating the transmission mechanism  3 . An oil equivalent to an automatic transmission fluid (ATF) having a relatively low viscosity is preferably used as the fluid O so that the oil can perform functions of a lubricating oil and a cooling oil. 
     A fluid reservoir P in which the fluid O is stored is provided in a lower region in the housing  6 . In the present embodiment, the fluid reservoir is provided in the gear accommodating portion  82 . The fluid O accumulated in the fluid reservoir P is scraped up by the operation of the transmission mechanism  3  and diffused into the gear accommodating portion  82 . 
     The fluid O diffused in the gear accommodating portion  82  is fed to each gear of the transmission mechanism  3  in the gear accommodating portion  82  to spread the fluid O over the tooth surfaces of the gears. The fluid O fed to the transmission mechanism  3  and used for lubrication drops and is collected in the fluid reservoir P in the gear accommodating portion  82 . 
       FIG.  3    is a front view of the gear cover  6 C. 
     As illustrated in  FIG.  3   , the third side wall portion  6   c  of the housing  6  is provided with a second gear facing surface  6   q  facing the transmission mechanism  3 . The bearing holder  60 G is provided on the second gear facing surface  6   q.  The bearing holder  60 G has a cylindrical portion  6   t  centered on the output axis J 3 . 
     The second gear facing surface  6   q  is provided with a guide rib  6   w  disposed directly above the cylindrical portion  6   t  of the bearing holder  60 G and a guide groove portion  6   u  extending along the guide rib  6   w.  The guide rib  6   w  protrudes from the second gear facing surface  6   q  on one side (+Y side) in the axial direction. The guide rib  6   w  extends along the up-down direction. The lower end portion of the guide rib  6   w  is connected to the outer peripheral surface of the cylindrical portion  6   t.  The guide groove portion  6   u  is disposed on the other side (+X side, vehicle rear side) in the front-rear direction of the guide rib  6   w.  The guide groove portion  6   u  penetrates the inside and outside of the cylindrical portion  6   t.    
     The ring gear  51  rotating around the output axis J 3  scrapes up the fluid O accumulated inside the gear accommodating portion  82 . When the vehicle travels forward (−X side), the ring gear  51  scoops up the fluid O on the vehicle rear side (+X side) with respect to the ring gear  51 . The fluid O scraped up by the ring gear  51  scatters to the upper side of the ring gear  51  and hits a surface of the guide rib  6   w  facing the vehicle rear side (+X side). The fluid O that has hit the guide rib  6   w  flows into the guide groove portion  6   u,  flows along the inner surface of the guide groove portion  6   u,  and is guided to the inside of the bearing holder  60 G. As a result, the fluid O lubricates the bearing  5 G. 
     The flow path  90  illustrated in  FIG.  1    is provided in the housing  6 . The flow path  90  is a circulation path through which the fluid O flows. That is, the fluid O flows through the flow path  90  provided in the housing  6 . The flow path  90  is a path of the fluid O that is fed to the fluid O from the fluid reservoir P to the motor  2  and the transmission mechanism  3 . 
     The flow path  90  is provided with the pump  8  and the cooler  9 . The pump  8  and the cooler  9  are each fixed to the outer side face of the housing  6 . 
     The pump  8  pressure-feeds the fluid O in the flow path  90 . The pump  8  is an electric pump driven by electricity. The pump  8  may be a mechanical pump that operates in accordance with the drive of the transmission mechanism  3 . When the pump  8  is a mechanical pump, the pump  8  is coupled to the output shaft  55  or the differential case shaft  50   a  via a gear or the like, and is driven by power of the transmission mechanism  3 . 
     The cooler  9  cools the fluid O in the flow path  90 . An internal flow path (not illustrated) through which the fluid O flows and an internal refrigerant flow path (not illustrated) through which the refrigerant L flows are provided inside the cooler  9 . The cooler  9  is a heat exchanger that cools the fluid O by transferring heat of the fluid O to the refrigerant L. 
     The flow path  90  of the present embodiment includes a suction flow path  91 , a discharge flow path  92 , a first intra-side wall flow path  93 , a first intra-housing flow path (intra-housing flow path)  94 , a second intra-side wall flow path  95 , a second intra-housing flow path  96 , a first intra-shaft flow path  97 A, a third intra-housing flow path  98 , a third intra-side wall flow path  99 , and a second intra-shaft flow path  97 B. 
     The suction flow path  91 , a part of the discharge flow path  92 , the first intra-side wall flow path  93 , the second intra-side wall flow path  95 , and the third intra-side wall flow path  99  are holes provided in the housing  6 . The suction flow path  91 , a part of the discharge flow path  92 , the first intra-side wall flow path  93 , the second intra-side wall flow path  95 , and the third intra-side wall flow path  99  are formed by drilling a wall portion of the housing  6 . 
     A part of the discharge flow path  92 , the first intra-housing flow path  94 , the second intra-housing flow path  96 , and the third intra-housing flow path  98  are pipe members disposed in the housing  6 . A part of the discharge flow path  92 , the first intra-housing flow path  94 , and the second intra-housing flow path  96  are disposed inside the motor accommodating portion  81 . On the other hand, the third intra-housing flow path  98  is disposed inside the gear accommodating portion  82 . 
     The first intra-shaft flow path  97 A and the second intra-shaft flow path  97 B are provided in hollow portions of the motor shaft  21 A and the first shaft  21 B, respectively. The hollow portion of the motor shaft  21 A and the hollow portion of the first shaft  21 B are coupled to each other. Therefore, the fluid O in the first intra-shaft flow path  97 A and the fluid O in the second intra-shaft flow path  97 B merge inside the motor shaft  21 A or the first shaft  21 B. 
     The suction flow path  91  connects the fluid reservoir P of the housing  6  and the pump  8 . The end portion of the suction flow path  91  on the upstream side opens to the fluid reservoir P. The suction flow path  91  penetrates the inside of the wall of the gear accommodating portion  82 . The suction flow path  91  guides the fluid O in the fluid reservoir P to the pump  8 . 
     The discharge flow path  92  connects the pump  8  and the first intra-side wall flow path  93 . The cooler  9  is disposed in the path of the discharge flow path  92 . The discharge flow path  92  has a pipe portion  92   a,  a first hole (hole)  92   b,  and a second hole (hole)  92   c.  The pipe portion  92   a  has a pipe shape disposed in the internal space of the motor accommodating portion  81 . On the other hand, the first hole  92   b  and the second hole  92   c  are provided in the wall portion of the housing  6  by drilling. The fluid O flows through the discharge flow path  92  in the order of the second hole  92   c,  the first hole  92   b,  and the pipe portion  92   a.    
     The second hole  92   c  connects the discharge port of the pump  8  and the inflow port of the cooler  9 . The second hole  92   c  feeds the fluid O from the pump  8  to the cooler  9 . The first hole  92   b  connects the outflow port of the cooler  9  and the internal space of the motor accommodating portion  81 . A stepped surface  81   d  facing one axial side (+Y side) is provided on the inner surface of the motor peripheral wall portion  6   d.  The first hole  92   b  opens to the stepped surface  81   d.    
     The pipe portion  92   a  extends along the axial direction. The end portion on the other side (−Y side) in the axial direction of the pipe portion  92   a  is inserted into the opening of the first hole  92   b  provided in the stepped surface  81   d.  On the other hand, the end portion on one side (+Y side) in the axial direction of the pipe portion  92   a  is inserted into the opening of the first intra-side wall flow path  93  provided in the first side wall portion  6   a.  Thus, the pipe portion  92   a  connects the opening of the first hole  92   b  and the first intra-side wall flow path  93 . The fluid O in the pipe portion  92   a  flows from the other side (−Y side) in the axial direction toward one side (+Y side). The pipe portion  92   a  is disposed inside the motor accommodating portion  81  and relays between the pump  8  and the first intra-housing flow path  94 . 
     According to the present embodiment, the discharge flow path  92  includes not only the holes (the first hole  92   b  and the second hole  92   c ) provided in the wall portion of the housing  6  but also the pipe portion  92   a.  In a case where the entire length of the discharge flow path  92  is a hole, it is necessary to make a housing of a portion where the hole is provided thick, and the weight of the housing increases. According to the present embodiment, the weight of the housing  6  can be reduced by forming a part of the discharge flow path  92  as the pipe portion  92   a.    
     According to the present embodiment, since the pipe portion  92   a  is disposed in the internal space of the motor accommodating portion  81 , the pipe portion  92   a  does not protrude from the outer surface of the housing  6 . According to the present embodiment, by disposing the pipe portion  92   a  in the dead space in the motor accommodating portion  81 , the drive apparatus  1  can be downsized as compared with the case where the pipe portion  92   a  is disposed outside. 
     The first intra-side wall flow path  93  is provided in the wall of the first side wall portion  6   a.  That is, the first intra-side wall flow path  93  is provided in the wall portion of the housing. The first intra-side wall flow path  93  extends along an orthogonal plane of the motor axis J 1 . The first intra-side wall flow path  93  is connected to the discharge flow path  92  in the end portion on the upstream side. The first intra-side wall flow path  93  is connected to the inside of the bearing holder  60 D in the end portion on the downstream side. The first intra-side wall flow path  93  is connected to the first intra-housing flow path  94  in a region between the end portion on the upstream side and the end portion on the downstream side. The first intra-side wall flow path  93  connects the pipe portion  92   a,  the first intra-housing flow path  94 , and the inside of the bearing holder  60 D. 
     A hollow portion of the motor shaft  21 A is opened inside the bearing holder  60 D. The fluid O flowing into the bearing holder  60 D from the first intra-side wall flow path  93  lubricates the bearing  5 D held by the bearing holder  60 D and flows into the motor shaft  21 A. Therefore, the first intra-side wall flow path  93  is connected to the first intra-shaft flow path  97 A in the end portion on the downstream side. 
     The first intra-side wall flow path  93  has a first region  93   a  and a second region  93   b.  The first region  93   a  connects the discharge flow path  92  and the first intra-housing flow path  94 . The second region  93   b  connects the first intra-housing flow path  94  and the first intra-shaft flow path  97 A. A part of the fluid O flowing from the discharge flow path  92  into the first intra-side wall flow path  93  and flowing through the first region  93   a  flows into the first intra-housing flow path  94 , and the other part flows into the second region  93   b.  The fluid O flowing into the second region  93   b  flows into the first intra-shaft flow path  97 A. 
       FIG.  4    is a cross-sectional view of the drive apparatus  1  along a cross section orthogonal to the motor axis J 1 . In  FIG.  4   , the first intra-side wall flow path  93  is illustrated by a virtual line (two-dot chain line). As illustrated in  FIG.  4   , the first region  93   a  is disposed radially outside the motor  2  when viewed from the axial direction. On the other hand, at least a part of the second region  93   b  overlaps the motor  2  when viewed from the axial direction. 
     The first intra-side wall flow path  93  of the present embodiment is connected to the first intra-housing flow path  94  in a path extending from the discharge flow path  92  to the first intra-shaft flow path  97 A. Therefore, the first intra-side wall flow path  93  can be a continuous flow path that does not branch halfway. According to the present embodiment, it is not necessary to provide a complicated hole in the first side wall portion  6   a.  As a result, it is possible not only to suppress a decrease in strength of the first side wall portion  6   a  but also to suppress restriction of arrangement of other configurations attached to the first side wall portion  6   a.    
     The first intra-side wall flow path  93  may be bifurcated inside the first side wall portion  6   a  and connected to the first intra-shaft flow path  97 A and the first intra-housing flow path  94  at a branch destination. 
     As illustrated in  FIG.  1   , the first intra-housing flow path  94  is connected to the first intra-side wall flow path  93 . The first intra-housing flow path  94  extends along the axial direction inside the motor accommodating portion  81 . An end portion on one side (+Y side) in the axial direction of the first intra-housing flow path  94  is inserted into an opening of the first intra-side wall flow path  93  provided in the first side wall portion  6   a.  On the other hand, the end portion on the other side (−Y side) in the axial direction of the first intra-housing flow path  94  is inserted into the opening of the second intra-side wall flow path  95  provided in the second side wall portion  6   b.  The fluid O in the first intra-housing flow path  94  flows from one side (+Y side) in the axial direction toward the other side (−Y side). 
     The first intra-housing flow path  94  is provided with a first feed hole (feed hole)  94   a  that feeds the fluid O to the motor  2  and a second feed hole (feed hole)  94   b  that feeds the fluid O to the bearing  5 H. The first feed hole  94   a  and the second feed hole  94   b  are holes penetrating in the thickness direction of the pipe constituting the first intra-housing flow path  94 . 
     The opening direction of the first feed hole  94   a  and the opening direction of the second feed hole  94   b  are opposite to each other in the front-rear direction of the vehicle. More specifically, the opening direction of the first feed hole  94   a  faces one side in the front-rear direction (−X side, vehicle front side). On the other hand, the opening direction of the second feed hole  94   b  faces the other side in the front-rear direction (+X side, vehicle rear side). 
     The first feed hole  94   a  ejects the fluid O toward the motor  2  by the pressure in the first intra-housing flow path  94 . Similarly, the second feed hole  94   b  ejects the fluid O toward the bearing  5 H by the pressure in the first intra-housing flow path  94 . 
     As illustrated in  FIG.  4   , the first intra-housing flow path  94  is disposed on a side portion of the stator core  32 . In the present embodiment, the first intra-housing flow path  94  is disposed on the other side (+X side, vehicle rear side) in the front-rear direction with respect to the stator core  32 . 
     The first intra-housing flow path  94  of the present embodiment is disposed below one fixing portion  32   a  of the stator core  32 . The stator core  32  has a plurality of fixing portions  32   a  protruding radially outward. The fixing portion  32   a  is provided with an insert hole  32   b  penetrating the fixing portion  32   a  in the axial direction. A bolt  32   c  extending in the axial direction passes through the insert hole  32   b.  The bolt  32   c  is screwed into a screw hole (not illustrated) provided in the inner surface of the housing  6 . By fastening the bolt  32   c  into the screw hole, the fixing portion  32   a  is fixed to the inner surface of the housing  6 . That is, the stator core  32  is fixed to the housing  6  at the fixing portion  32   a.  The stator core  32  of the present embodiment has four fixing portions  32   a.  The plurality of fixing portions  32   a  are disposed at equal intervals along the circumferential direction. The first feed hole  94   a  of the first intra-housing flow path  94  ejects the fluid O toward the outer peripheral surface of the stator core  32  below one fixing portion  32   a.    
     In the present embodiment, the radial position of the first intra-housing flow path  94  overlaps with the radial position of the fixing portion  32   a.  According to the present embodiment, the first intra-housing flow path  94  can be disposed close to the outer peripheral surface of the stator core  32 , and the fluid O can be efficiently fed from the first feed hole  94   a  to the stator  30 . 
     As illustrated in  FIG.  1   , the first intra-housing flow path  94  of the present embodiment is provided with a plurality of first feed holes  94   a.  The plurality of first feed holes  94   a  are arranged along the axial direction. As described above, some of the plurality of first feed holes  94   a  feeds the fluid O to the outer peripheral surface of the stator core  32 . The other portions of the plurality of first feed holes  94   a  feed the fluid O to the coil ends of the coils  31  protruding from one side and the other side in the axial direction of the stator core  32 . The fluid O fed to the stator core  32  and the coil  31  takes heat from the stator  30  when flowing along the surfaces of the stator core  32  and the coil  31 , and cools the stator  30 . Further, the fluid O drops from the stator  30 , reaches the lower region of the internal space of the motor accommodating portion  81 , and returns to the fluid reservoir P via a through hole (not illustrated) provided in the second side wall portion  6   b.    
     The first intra-housing flow path  94  and the pipe portion  92   a  of the discharge flow path  92  are coupled to each other by a coupling portion  4   a.  The first intra-housing flow path  94 , the pipe portion  92   a,  and the coupling portion  4   a  are formed of the flow path member  4  which is a single member. The configuration of the flow path member  4  will be described in detail later. 
     The first intra-housing flow path  94  is disposed along the vertical wall region  6   k  of the second side wall portion  6   b.  As described above, the through hole  6   h  is provided in the vertical wall region  6   k.  The through hole  6   h  is provided in a portion of the vertical wall region  6   k  facing the first intra-housing flow path  94 . The second feed hole  94   b  of the first intra-housing flow path  94  faces the internal space of the gear accommodating portion  82  via the through hole  6   h.    
     As illustrated in  FIG.  2   , the second feed hole  94   b,  the through hole  6   h,  and the notch  6   g  of the bearing holder  60 H are disposed side by side in the radial direction of the output axis J 3 . That is, the second feed hole  94   b  faces the outer peripheral surface of the bearing  5 H via the through hole  6   h  and the bearing holder  60 H. The fluid O ejected from the second feed hole  94   b  passes through the through hole  6   h  and the notch  6   g  and is fed to the bearing  5 H. As a result, the fluid O lubricates the bearing  5 H. 
     According to the present embodiment, the fluid O can be fed from the pipe-shaped first intra-housing flow path  94  arranged inside the motor accommodating portion  81  to the bearing  5 H disposed inside the gear accommodating portion  82 . Therefore, it is not necessary to provide a reservoir (for example, a catch tank) or the like inside the gear accommodating portion  82  for feeding the fluid O to the bearing  5 H. As a result, the structure of the gear accommodating portion  82  can be simplified, and the entire drive apparatus  1  can be downsized. 
     According to the first intra-housing flow path  94  of the present embodiment, the fluid O can be fed to the inside of the accommodating portions (the motor accommodating portion  81  and the gear accommodating portion  82 ) different from each other. Therefore, the structure of the flow path  90  can be simplified as compared with the case where the flow paths are disposed inside the respective accommodating portions. As a result, the pressure loss in the flow path  90  can be reduced, and the power consumption of the pump  8  can be suppressed. An arrangement space of the flow path  90  can be reduced, and the drive apparatus  1  can be downsized. 
     According to the present embodiment, as the opening through which the fluid O passes, the through hole  6   h  is provided in the vertical wall region  6   k,  and the notch  6   g  is provided in the cylindrical portion  6   f.  As a result, even when the direction in which the first intra-housing flow path  94  extends and the output axis J 3  that is the center of the bearing  5 H are disposed in parallel to each other, the fluid O can be fed to the bearing  5 H without being obstructed by the vertical wall region  6   k  and the cylindrical portion  6   f.  In other words, it is possible to adopt a configuration in which the extending direction of the first intra-housing flow path  94  is disposed parallel to the output axis J 3 , and the degree of freedom in the arrangement of the first intra-housing flow path  94  is increased. 
     In the present embodiment, the case where the two openings of the through hole  6   h  and the notch  6   g  are provided in the second side wall portion  6   b  as the opening through which the fluid O passes has been described. However, the opening through which the fluid O passes is not limited to the present embodiment. That is, the second feed hole  94   b  may face the bearing  5 H through an opening (in the present embodiment, the through hole  6   h  and the notch  6   g ) provided in the second side wall portion  6   b.  That is, the opening is not limited to a specific configuration (shape, posture, direction, number, and the like) as long as it opens a part of the second side wall portion  6   b  that inhibits the passage of the fluid O between the second feed hole  94   b  and the bearing  5 H. 
     In the present embodiment, an opening area H 1  of the through hole  6   h  is larger than an opening area H 2  of the notch  6   g.  When the drive apparatus  1  receives large vibration, the ejection direction of the fluid O ejected from the second feed hole  94   b  swings in the vibration direction. By making the opening area H 1  of the through hole  6   h  sufficiently large, even when the direction of the fluid O ejected from the second feed hole  94   b  is not stable, the fluid O can be sent into the gear accommodating portion  82 . That is, even if the fluid O ejected from the second feed hole  94   b  cannot be fed to the bearing  5 H, at least the fluid O can be sent to the inside of the gear accommodating portion  82 , and an increase in the discharge amount to the inside of the motor accommodating portion  81  can be suppressed. When the fluid O is discharged from the second feed hole  94   b  to the motor accommodating portion  81 , the liquid level of the fluid O temporarily accumulated in the motor accommodating portion  81  becomes higher than the lower end of the rotor  20 , and there is a possibility that the stirring resistance of the rotor  20  increases. According to the present embodiment, it is possible to suppress an increase in the liquid level of the fluid O inside the motor accommodating portion  81 . On the other hand, if the opening area H 2  of the notch  6   g  is too large, the rigidity of the bearing holder  60 H may decrease, leading to unstable holding of the bearing  5 H. Therefore, the opening area H 2  of the notch  6   g  is limited, and it is difficult to make the opening area H 2  larger than the opening area H 1  of the through hole  6   h.  According to the present embodiment, by setting the opening areas H 1  and H 2  to the above-described relationship, it is possible to suppress an increase in the liquid level of the fluid O inside the motor accommodating portion  81  while stabilizing the holding of the bearing  5 H by the bearing holder  60 H. 
     The opening area H 2  of the notch  6   g  in the present specification is an area of a region surrounded by an inner edge of the notch  6   g  and an extension line of a tip edge of the bearing holder  60 H when the notch  6   g  is viewed from the radial direction of the output axis J 3 . 
     In the present embodiment, the second feed hole  94   b,  the opening (in the present embodiment, the through hole  6   h  and the notch  6   g ) of the second side wall portion  6   b,  and the bearing  5 H are arranged along the direction intersecting the axial direction of the motor axis J 1 . Therefore, when the first intra-housing flow path  94  is disposed in parallel with the motor axis J 1 , the fluid O can be directly fed from the first intra-housing flow path  94  to the bearing  5 H, and the bearing  5 H can be efficiently lubricated. 
     As illustrated in  FIG.  4   , the first intra-housing flow path  94  is disposed between the motor axis J 1  and the output axis J 3  parallel to each other in the front-rear direction (X-axis direction) of the vehicle. That is, the first intra-housing flow path  94  is disposed between the motor axis J 1  and the output axis J 3  when viewed from the up-down direction. According to the present embodiment, the first intra-housing flow path  94  can be disposed between the motor  2  and the bearing  5 H in the front-rear direction of the vehicle, and can be brought close to each of the motor  2  and the bearing  5 H. As a result, the fluid O can be efficiently fed from the first intra-housing flow path  94  to the motor  2  and the bearing  5 H. 
     As illustrated in  FIG.  4   , a first common tangent line L 1  and a second common tangent line L 2  respectively contacting the outer shape of the motor  2  and the outer shape of the bearing  5 H are assumed when viewed from the axial direction of the motor axis J 1 . In the present embodiment, the first common tangent line L 1  and the second common tangent line L 2  are in contact with different fixing portions  32   a  of the stator core  32 . The first intra-housing flow path  94  is preferably disposed in a region surrounded by the motor  2 , the bearing  5 H, the first common tangent line L 1 , and the second common tangent line L 2 . As a result, the first intra-housing flow path  94  can be brought close to both the motor  2  and the bearing  5 H, and the fluid O can be efficiently fed from the first intra-housing flow path  94  to the motor  2  and the bearing  5 H. 
     In the present embodiment, the second feed hole  94   b,  the through hole  6   h,  the notch  6   g,  and the bearing  5 H are linearly arranged in the radial direction of the output axis J 3 . However, as illustrated in a drive apparatus  1 A of the modification of  FIG.  5   , the second feed hole  94   b,  the through hole  6   h,  the notch  6   g,  and the bearing  5 H may be disposed side by side in a straight line inclined in the axial direction toward the radially outer side. Even in this case, the fluid O can be fed to the bearing  5 H by providing the second feed hole  94   b  such that the ejection direction of the fluid O faces the bearing  5 H side. 
     As illustrated in  FIG.  1   , the second intra-side wall flow path  95  is connected to the first intra-housing flow path  94 . The second intra-side wall flow path  95  is provided in the wall of the second side wall portion  6   b.  The second intra-side wall flow path  95  extends along an orthogonal plane of the motor axis J 1 . The second intra-side wall flow path  95  is connected to the first intra-housing flow path  94  in the end portion on the upstream side. The second intra-side wall flow path  95  is connected to the second intra-housing flow path  96  and the third intra-housing flow path  98  in the end portion on the downstream side. The second intra-side wall flow path  95  connects the first intra-housing flow path  94 , the second intra-housing flow path  96 , and the third intra-housing flow path  98 . 
     The second intra-side wall flow path  95  has a feed portion  95   a  connected to the inside of the bearing holder  60 F. The feed portion  95   a  can feed the fluid O flowing through the second intra-side wall flow path  95  to the inside of the bearing holder  60 F to lubricate the bearing  5 F held by the bearing holder  60 F. According to the present embodiment, the bearing  5 F can be lubricated without providing a reservoir or the like inside the gear accommodating portion  82  for feeding a fluid to the bearing  5 F. 
       FIG.  6    is a front view of the housing body  6 B when viewed from the gear accommodating portion  82  side.  FIG.  7    is a cross-sectional view of the housing body  6 B taken along line VII-VII of  FIG.  6   . 
     As illustrated in  FIG.  6   , the second intra-side wall flow path  95  overlaps the bearing holder  60 F when viewed from the axial direction of the motor axis J 1 . The feed portion  95   a  is a hole connected from the second intra-side wall flow path  95  to the bearing holder  60 F. The feed portion  95   a  extends from the second intra-side wall flow path  95  to the other side (−Y side) in the axial direction. The feed portion  95   a  is located in a region where the second intra-side wall flow path  95  and the bearing holder  60 F overlap each other when viewed from the axial direction. 
     According to the present embodiment, the second intra-side wall flow path  95  and the bearing holder  60 F overlap each other when viewed from the axial direction. Therefore, the flow path of the feed portion  95   a  connecting the second intra-side wall flow path  95  and the bearing holder  60 F can be shortened. Therefore, not only the pressure loss in the feed portion  95   a  can be reduced, but also the reduction in the strength of the second side wall portion  6   b  due to the provision of the feed portion  95   a  can be suppressed. 
     The first gear facing surface  6   p  of the second side wall portion  6   b  is provided with a recessed groove portion  6   m.  The recessed groove portion  6   m  connects the bearing holder  60 F centered on the intermediate axis J 2  and the shaft passing hole  6   s  centered on the motor axis J 1 . In the present embodiment, the intermediate axis J 2  is disposed above the motor axis J 1 . Therefore, the fluid O is fed to the bearing holder  60 F from the second intra-side wall flow path  95  is fed to the shaft passing hole  6   s  via the recessed groove portion  6   m.  As a result, the bearings  5 B and  5 C disposed inside the shaft passing hole  6   s  are lubricated. 
     As illustrated in  FIG.  7   , the end portion on the downstream side of the second intra-side wall flow path  95  is connected to the second intra-housing flow path  96  and the third intra-housing flow path  98 . The second intra-housing flow path  96  is disposed in the internal space of the motor accommodating portion  81  expanding on one side (+Y side) in the axial direction of the second side wall portion  6   b.  On the other hand, the third intra-housing flow path  98  is disposed in the internal space of the gear accommodating portion  82  expanding to the other side (−Y side) in the axial direction of the second side wall portion  6   b.  Therefore, the second intra-housing flow path  96  and the third intra-housing flow path  98  extend to the opposite side in the axial direction with respect to the second intra-side wall flow path  95 . 
     A first insertion hole  95   p  opening to one side (+Y side) in the axial direction and a second insertion hole  95   q  opening to the other side (−Y side) in the axial direction are provided in the end portion on the downstream side of the second intra-side wall flow path  95 . The first insertion hole  95   p  and the second insertion hole  95   q  overlap each other when viewed from the axial direction of the motor axis J 1 . The first insertion hole  95   p  and the second insertion hole  95   q  are coaxially disposed. 
     A pipe constituting the second intra-housing flow path  96  is inserted into the first insertion hole  95   p,  and a pipe constituting the third intra-housing flow path  98  is inserted into the second insertion hole  95   q.  The cross-sectional area of the first insertion hole  95   p  is substantially uniform. On the other hand, the second insertion hole  95   q  is provided with a reduced diameter portion  95   r  whose cross-sectional area is partially reduced. 
     A first boundary portion  95   b  is provided in the first insertion hole  95   p  of the second intra-side wall flow path  95 . The first boundary portion  95   b  is an axially extending region located between the tip of the second intra-housing flow path  96  inserted into the first insertion hole  95   p  and a portion extending orthogonal to the axial direction of the second intra-side wall flow path  95 . Similarly, a second boundary portion  95   c  is provided in the second insertion hole  95   q  of the second intra-side wall flow path  95 . The second boundary portion  95   c  is an axially extending region located between the tip of the third intra-housing flow path  98  inserted into the second insertion hole  95   q  and a portion extending orthogonal to the axial direction of the second intra-side wall flow path  95 . That is, the second intra-side wall flow path  95  has the first boundary portion  95   b  at the boundary with the second intra-housing flow path  96 , and has the second boundary portion  95   c  at the boundary with the third intra-housing flow path  98 . The second boundary portion  95   c  is provided with the reduced diameter portion  95   r.    
     According to the present embodiment, the cross-sectional area of the first boundary portion  95   b  is larger than the cross-sectional area of the second boundary portion  95   c.  Therefore, the fluid O flowing through the second intra-side wall flow path  95  flows into the second intra-housing flow path  96  more than the third intra-housing flow path  98 . As described later, the fluid O fed to the second intra-housing flow path  96  is mainly fed to the motor  2  to cool the motor  2 . On the other hand, the fluid O fed to the third intra-housing flow path  98  is mainly fed to the transmission mechanism  3  to lubricate the transmission mechanism  3 . According to the present embodiment, in a case where cooling of the motor  2  is prioritized over lubrication of the transmission mechanism  3 , it is possible to feed more fluid O to the motor  2  than to the transmission mechanism  3 . 
     According to the present embodiment, the first boundary portion  95   b  and the second boundary portion  95   c  overlap each other when viewed from the axial direction of the motor axis J 1 . Therefore, when viewed from the axial direction, the second intra-housing flow path  96  and the third intra-housing flow path  98  are disposed at the same position, and the projected area of the housing  6  in the axial direction can be reduced. According to the present embodiment, it is possible to reduce the size of the drive apparatus  1 . 
     As illustrated in  FIG.  1   , the second intra-housing flow path  96  is connected to the second intra-side wall flow path  95 . The second intra-housing flow path  96  extends along the axial direction inside the motor accommodating portion  81 . An end portion on one side (+Y side) in the axial direction of the second intra-housing flow path  96  is fixed to the inner surface of the housing  6 . On the other hand, the end portion on the other side (−Y side) in the axial direction of the second intra-housing flow path  96  is inserted into the opening of the second intra-side wall flow path  95  provided in the second side wall portion  6   b.  The fluid O in the second intra-housing flow path  96  flows from the other side (−Y side) in the axial direction toward one side (+Y side). 
     A gap is provided between the end portion on one side (+Y side) in the axial direction of the second intra-housing flow path  96  and the first side wall portion  6   a.  A stepped surface  81   e  facing one side (+Y side) in the axial direction is provided on the inner surface of the motor peripheral wall portion  6   d.  The second intra-housing flow path  96  is screwed to the stepped surface  81   e  from one side (+Y side) in the axial direction at an attachment portion  81   f  in the end portion on one side (+Y side) in the axial direction. The second intra-housing flow path  96  of the present embodiment can be fixed to the housing body  6 B in a state where the motor cover  6 A is opened. According to the present embodiment, the second intra-housing flow path  96  can be easily assembled as compared with the case where both end portions of the second intra-housing flow path  96  are each fixed to the first side wall portion  6   a  and the second side wall portion  6   b.    
     The second intra-housing flow path  96  is provided with a third feed hole (feed hole)  96   a  for feeding the fluid O to the motor  2 . The third feed hole  96   a  is a hole penetrating in the thickness direction of the pipe constituting the second intra-housing flow path  96 . The third feed hole  96   a  ejects the fluid O toward the motor  2  by the pressure in the second intra-housing flow path  96 . 
     As illustrated in  FIG.  4   , the second intra-housing flow path  96  is disposed on the side portion of the stator core  32 . In the present embodiment, the second intra-housing flow path  96  is disposed directly above the stator core  32 . In this specification, “directly above” means that they are disposed so as to overlap each other when viewed from above and the up-down direction. 
     As described above, the stator core  32  has the fixing portion  32   a  protruding radially outward. In the present embodiment, the radial position of the second intra-housing flow path  96  overlaps the radial position of the fixing portion  32   a.  According to the present embodiment, the second intra-housing flow path  96  can be disposed close to the outer peripheral surface of the stator core  32 , and the fluid O can be efficiently fed from the third feed hole  96   a  to the stator  30 . 
     According to the present embodiment, the fluid O is fed to the outer peripheral surface of the motor  2  from each of the first feed hole  94   a  of the first intra-housing flow path  94  and the third feed hole  96   a  of the second intra-housing flow path  96 . As a result, the fluid O can be fed to the entire outer peripheral surface of the motor  2 , and it is possible to prevent a local high-temperature portion from being provided on the surface of the motor  2 . 
     In the present embodiment, the first intra-housing flow path  94  and the second intra-housing flow path  96  are disposed on both sides of one fixing portion  32   a  in the circumferential direction, and extend in parallel along the axial direction of the motor axis J 1 . According to the present embodiment, the fluid O can be fed from the first intra-housing flow path  94  and the second intra-housing flow path  96  to the outer peripheral surfaces of the stator core  32  on both sides of one fixing portion  32   a.    
     According to the present embodiment, the flow path (the first intra-side wall flow path  93 ) for feeding the fluid O to the first intra-housing flow path  94  and the flow path (the second intra-side wall flow path  95 ) for feeding the fluid O to the second intra-housing flow path  96  are provided in the side wall portions (the first side wall portion  6   a  and the second side wall portion  6   b ) disposed opposite to each other in the axial direction. Therefore, the fluid O flows in the first intra-housing flow path  94  and the second intra-housing flow path  96  in opposite directions. 
     When the two intra-housing flow paths are connected to the flow path in the side wall portion on one side in the axial direction with respect to the motor, the intra-side wall flow path tends to be long and complicated. According to the present embodiment, the first intra-housing flow path  94  is connected to the first intra-side wall flow path  93  on one side (+Y side) in the axial direction of the motor  2 , and the second intra-housing flow path  96  is connected to the second intra-side wall flow path  95  on the other side (−Y side) in the axial direction of the motor  2 . Therefore, each of the intra-side wall flow paths (the first intra-side wall flow path  93  and the second intra-side wall flow path  95 ) can be shortened and simplified. As a result, it is possible to suppress a decrease in strength and rigidity of the first side wall portion  6   a  and the second side wall portion  6   b.  In addition, it is possible to suppress restriction of arrangement of other configurations attached to the first side wall portion  6   a  and the second side wall portion  6   b,  as compared with a case where complicated intra-side wall flow paths are concentratedly disposed on any one of the first side wall portion  6   a  and the second side wall portion  6   b.    
     As illustrated in  FIG.  1   , the third intra-housing flow path  98  is connected to the second intra-side wall flow path  95 . The third intra-housing flow path  98  extends along the axial direction inside the gear accommodating portion  82 . The fluid O in the third intra-housing flow path  98  flows from one side (+Y side) in the axial direction toward the other side (−Y side). An end portion on one side (+Y side) in the axial direction of the third intra-housing flow path  98  is inserted into an opening of the second intra-side wall flow path  95  provided in the second side wall portion  6   b.    
     The third intra-housing flow path  98  is provided with a fourth feed hole (feed hole)  98   a  for feeding the fluid O to the transmission mechanism  3 . The fourth feed hole  98   a  is a hole penetrating in the thickness direction of the pipe constituting the third intra-housing flow path  98 . The fourth feed hole  98   a  ejects the fluid O toward the transmission mechanism  3  by the pressure in the third intra-housing flow path  98 . According to the present embodiment, the fluid O can be fed from the flow path  90  to the transmission mechanism  3  to lubricate the transmission mechanism  3  without providing a configuration for feeding the fluid O such as a reservoir in the gear accommodating portion  82 . 
     In the present embodiment, the opening of the fourth feed hole  98   a  faces the first gear  41  or the second gear. Therefore, the fluid O ejected from the fourth feed hole  98   a  is fed to the first gear  41  or the second gear  42 . In the present embodiment, the first gear  41  and the second gear mesh with each other. Therefore, by feeding the fluid O from the fourth feed hole  98   a  to any one of the first gear  41  and the second gear  42 , the tooth surfaces of both gears can be lubricated with the fluid O. As in the present embodiment, the transmission mechanism  3  is provided with the ring gear  51  that rotates about the output axis J 3 . The ring gear  51  generally has a larger diameter than other gears and is likely to be immersed in the fluid reservoir P. Therefore, it is not always necessary to feed the fluid O to the ring gear  51  and the third gear  43  meshing with the ring gear  51 . When the fluid O is fed to the first gear  41  or the second gear  42  as in the present embodiment, lubrication of all the gears of the transmission mechanism  3  can be maintained, and the operation of the transmission mechanism  3  can be performed smoothly. 
     As illustrated in  FIG.  1   , the third intra-side wall flow path  99  is connected to the third intra-housing flow path  98 . The third intra-side wall flow path  99  is provided in the wall of the third side wall portion  6   c.  The third intra-side wall flow path  99  extends along a plane orthogonal to the motor axis J 1 . The third intra-side wall flow path  99  includes a first flow path portion  99 A and a second flow path portion  99 B. The first flow path portion  99 A is a region on the upstream side of the third intra-side wall flow path  99 , and the second flow path portion  99 B is a region on the downstream side of the third intra-side wall flow path  99 . 
     The first flow path portion  99 A is connected to the third intra-housing flow path  98  in the end portion on the upstream side. The first flow path portion  99 A is connected to the inside of the bearing holder  60 E in the end portion on the downstream side. The second flow path portion  99 B is connected to the inside of the bearing holder  60 E in the end portion on the upstream side. The second flow path portion  99 B is connected to the inside of the bearing holder  60 A in the end portion on the downstream side. 
     As illustrated in  FIG.  3   , the first flow path portion  99 A is a recessed groove provided on the second gear facing surface  6   q  of the third side wall portion  6   c  facing the transmission mechanism  3 . The fluid O discharged from the end portion of the third intra-housing flow path  98  flows into the first flow path portion  99 A. The fluid O in the first flow path portion  99 A flows into the bearing holder  60 E by gravity. 
     As illustrated in  FIG.  1   , a hollow portion of the second shaft  45  is opened inside the bearing holder  60 E. The fluid O flowing into the bearing holder  60 E from the first flow path portion  99 A of the third intra-side wall flow path  99  lubricates the bearing  5 E held by the bearing holder  60 E, and flows into the inside of the second shaft  45  and the second flow path portion  99 B. A part of the fluid O flowing into the second shaft  45  reaches one side (+Y side) in the axial direction of the second shaft  45  and lubricates the bearing  5 F. 
     As illustrated in  FIG.  3   , the second flow path portion  99 B is a through hole penetrating the cylindrical portion of the bearing holder  60 E centered on the intermediate axis J 2  and the cylindrical portion of the bearing holder  60 A centered on the motor axis J 1 . The second flow path portion  99 B extends along the up-down direction. In the present embodiment, the intermediate axis J 2  is disposed above the motor axis J 1 . Therefore, a part of the fluid O inside the bearing holder  60 E flows through the second flow path portion  99 B by gravity and flows into the inside of the bearing holder  60 A. 
     As illustrated in  FIG.  1   , a hollow portion of the first shaft  21 B opens inside the bearing holder  60 A. The fluid O flowing into the bearing holder  60 A from the second flow path portion  99 B of the third intra-side wall flow path  99  lubricates the bearing  5 A held by the bearing holder  60 A and flows into the first shaft  21 B. Therefore, the end portion on the downstream side portion of the third intra-side wall flow path  99  is connected to the second intra-shaft flow path  97 B. 
     According to the present embodiment, the third intra-side wall flow path  99  feeds the fluid O to the bearings  5 A and  5 E held by the third side wall portion  6   c.  According to the present embodiment, the bearings  5 A and  5 E can be lubricated without providing a reservoir or the like for feeding fluid to the bearings  5 A and  5 E inside the gear accommodating portion  82 . 
     The first intra-shaft flow path  97 A is connected to the first intra-side wall flow path  93  and is provided in the hollow portion of the motor shaft  21 A. That is, the first intra-shaft flow path  97 A is a path of the fluid O passing through the hollow portion of the motor shaft  21 A. In the first intra-shaft flow path  97 A, the fluid O flows from one side (+Y side) in the axial direction toward the other side (−Y side). 
     The motor shaft  21 A is provided with a communicating hole  21   p  that extends in the radial direction and communicates the inside and the outside of the motor shaft  21 A. The fluid O in the first intra-shaft flow path  97 A is scattered radially outward through the communicating hole  21   p  by a centrifugal force accompanying the rotation of the motor shaft  21 A and is fed to the stator  30 . 
     In the present embodiment, the coupling body of the shaft constituting the first intra-shaft flow path  97 A extends between the first side wall portion  6   a  and the third side wall portion  6   c.  Therefore, in order to feed the fluid O to the first intra-shaft flow path  97 A, it is necessary to send the fluid O from one of the first side wall portion  6   a  and the third side wall portion  6   c  to the inside of the shaft. The flow path  90  of the present embodiment feeds the fluid O from the first side wall portion  6   a  on one side (+Y side) in the axial direction of the motor  2  to the first intra-shaft flow path  97 A. Therefore, as compared with the case where the fluid O is fed from the third side wall portion  6   c  to the first intra-shaft flow path  97 A, the distance between the pump  8  disposed on the outer periphery of the motor accommodating portion  81  and the first intra-shaft flow path  97 A is easily shortened. As a result, the passage resistance of the flow path connecting the pump  8  and the first intra-shaft flow path  97 A can be suppressed, and a large amount of fluid O can be fed to the first intra-shaft flow path  97 A. 
     As illustrated in  FIG.  4   , when viewed from the axial direction of the motor axis J 1 , a distance D 1  between the first intra-housing flow path  94  and the first intra-shaft flow path  97 A is shorter than a distance D 2  between the first intra-housing flow path  94  and the second intra-housing flow path  96 . According to the present embodiment, the first intra-shaft flow path  97 A is relatively close to the first intra-housing flow path  94 . Therefore, even if the first intra-housing flow path  94  and the first intra-shaft flow path  97 A are connected by the first intra-side wall flow path  93 , problems such as the first intra-side wall flow path  93  being long and complicated are less likely to occur. 
     As illustrated in  FIG.  1   , the second intra-shaft flow path  97 B is connected to the third intra-side wall flow path  99  and is provided in the hollow portion of the first shaft  21 B. That is, the second intra-shaft flow path  97 B is a path of the fluid O passing through the hollow portion of the first shaft  21 B. In the second intra-shaft flow path  97 B, the fluid O flows from the other side (−Y side) in the axial direction toward one side (+Y side). 
     The fluid O flowing through the second intra-shaft flow path  97 B merges with the fluid flowing through the first intra-shaft flow path  97 A. The merged fluid O leaks from the coupling portion between the motor shaft  21 A and the first shaft  21 B, is fed to the bearings  5 B and  5 C held by the second side wall portion  6   b,  and lubricates the bearings  5 B and  5 C. 
       FIG.  8    is a perspective view of a flow path member  4  of the present embodiment. 
     The flow path member  4  includes a first intra-housing flow path  94 , a pipe portion  92   a,  a coupling portion  4   a  that couples the first intra-housing flow path  94  and the pipe portion  92   a,  and a plurality of ribs  4   b  that reinforce the coupling portion  4   a.    
     According to the present embodiment, the pipe portion  92   a  that relays between the pump  8  and the first intra-housing flow path  94  is coupled to the first intra-housing flow path  94 . Therefore, the assembly process can be simplified as compared with a case where the first intra-housing flow path  94  and the pipe portion  92   a  are separately assembled to the housing  6 . In particular, in the present embodiment, since the first intra-housing flow path  94  and the pipe portion  92   a  are formed of a single member (flow path member  4 ), the number of components can be reduced to achieve cost reduction. 
     According to the present embodiment, the pipe portion  92   a  and the first intra-housing flow path  94  extend in parallel with each other. The coupling portion  4   a  of the present embodiment has a plate shape extending along the extending direction of the pipe portion  92   a  and the first intra-housing flow path  94 . The coupling portion  4   a  is provided with a through hole  4   h.  The through hole  4   h  penetrates the coupling portion  4   a  in the thickness direction. 
     The flow path member  4  is disposed along the outer peripheral surface of the motor  2 . The fluid O is fed to the motor  2  from feed holes (first feed hole  94   a,  third feed hole  96   a ) of the first intra-housing flow path  94  and the second intra-housing flow path  96 . For this reason, the fluid O bouncing off the outer peripheral surface of the motor  2  is applied to the flow path member  4 . According to the present embodiment, since the through hole  4   h  is provided in the coupling portion  4   a,  the fluid O applied to the coupling portion  4   a  can be dropped downward, and accumulation of the fluid O on the upper side of the coupling portion  4   a  can be suppressed. 
     The rib  4   b  of the present embodiment has a plate shape extending along a plane orthogonal to the extending direction of the pipe portion  92   a  and the first intra-housing flow path  94 . The plurality of ribs  4   b  are arranged at equal intervals along the extending direction of the pipe portion  92   a  and the first intra-housing flow path  94 . Each rib  4   b  is connected to the outer periphery of the pipe portion  92   a,  the outer periphery of the first intra-housing flow path  94 , and the coupling portion  4   a.    
     The flow path member  4  is provided with a recess  4   c  surrounded by the pipe portion  92   a,  the first intra-housing flow path  94 , the coupling portion  4   a,  and the rib  4   b.  The flow path member  4  of the present embodiment is provided with three recesses  4   c.  The fluid O scattered in the flow path member  4  tends to accumulate in the three recesses  4   c.  The through hole  4   h  of the present embodiment is disposed in the coupling portion  4   a  constituting each recess  4   c.  Therefore, the through hole  4   h  can discharge the fluid O accumulated in each recess  4   c.  The through hole  4   h  can discharge the fluid O accumulated in the recess  4   c  as long as the through hole  4   h  is disposed on any surface constituting the recess  4   c.  Therefore, the through hole  4   h  may be provided in at least one of the coupling portion  4   a  and the rib  4   b.    
     As illustrated in  FIG.  4   , the first intra-housing flow path  94  is disposed below the pipe portion  92   a  when viewed in the direction in which the pipe portion  92   a  and the first intra-housing flow path  94  extend (in the axial direction of the motor axis J 1  in the present embodiment). Since one of the pipe portion  92   a  and the first intra-housing flow path is disposed below the other in this manner, the flow path member  4  can be disposed in an inclined manner, and the fluid O scattering toward the flow path member  4  can be suppressed from accumulating in the flow path member  4 . 
     In the present embodiment, the first intra-housing flow path  94  is disposed above the motor axis J 1  and the output axis J 3 . As described above, the first intra-housing flow path  94  feeds the fluid O to each of the motor  2  disposed around the motor axis J 1  and the bearing  5 H disposed around the output axis J 3 . According to the present embodiment, since the first intra-housing flow path  94  is disposed above the motor axis J 1  and the output axis J 3 , the fluid O can be fed to the motor  2  and the bearing  5 H using gravity. Further, in the present embodiment, the first intra-housing flow path  94  is disposed below the pipe portion  92   a.  According to the present embodiment, by using the pipe disposed on the lower side of the pipe portion  92   a  and the first intra-housing flow path  94  as the first intra-housing flow path  94 , the first intra-housing flow path  94  can be disposed close to the motor  2  and the bearing  5 H, and the fluid O can be efficiently fed. 
     In the present embodiment, the distance between the first intra-housing flow path  94  and the motor axis J 1  is shorter than the distance between the pipe portion  92   a  and the motor axis J 1 . As described above, the fluid O can be efficiently fed to the motor  2  by disposing the first intra-housing flow path  94  for feeding the fluid O to the motor  2 , of the pipe portion  92   a  and the first intra-housing flow path  94 , close to the motor axis J 1 . 
     As illustrated in  FIG.  1   , in the present embodiment, the flow direction of the fluid O flowing through the pipe portion  92   a  and the flow direction of the fluid O flowing through the first intra-housing flow path  94  are opposite to each other. According to the present embodiment, the fluid O can be fed to the first intra-housing flow path  94  using the pipe portion  92   a.    
     In the present embodiment, the case where the rib  4   b  extends along the plane orthogonal to the direction in which the pipe portion  92   a  and the first intra-housing flow path  94  extend has been described. However, the configuration of the rib  4   b  is not limited to the present embodiment. As shown in the flow path member  104  of the modification illustrated in  FIG.  9   , a rib  104   b  may extend in the same direction as the extending direction of the pipe portion  92   a  and the first intra-housing flow path  94 . 
     The refrigerant flow path  70  illustrated in  FIG.  1    is a flow path through which the refrigerant L flows. The refrigerant L flowing in the refrigerant flow path  70  is, for example, water. The refrigerant flow path  70  is provided in the housing  6 . The refrigerant flow path  70  includes an external refrigerant pipe  71  passing through the outside of the housing  6  and an internal refrigerant flow path  72  passing through the inside of the housing  6 . The inverter  7  and the cooler  9  are disposed in the path of the refrigerant flow path  70 . 
     The external refrigerant pipe  71  is a pipe connected to the housing  6 . The external refrigerant pipe  71  of the present embodiment is connected to the inverter accommodating portion  89  and the side portion of the motor accommodating portion  81 . The internal refrigerant flow path  72  is a hole extending inside the housing  6 . The internal refrigerant flow path  72  connects the external refrigerant pipe  71  and the cooler  9 . A radiator (not illustrated) is disposed in the path of the external refrigerant pipe  71 . The radiator cools the refrigerant L flowing through the refrigerant flow path  70 . 
     The refrigerant flow path  70  passes through the inverter  7  and the cooler  9  in this order from a radiator (not illustrated) and returns to the radiator. In the cooler  9 , the refrigerant L exchanges heat with the fluid O flowing through the flow path  90  to cool the fluid O. The refrigerant L cools the inverter  7  in the course of passing through the inverter  7 . 
     In the present embodiment, a case where oil is employed as the fluid O and cooling water is employed as the refrigerant L will be described, but the present invention is not limited thereto. For example, both the fluid O and the refrigerant L may be oil. Even in this case, it is sufficient that the flow path  90  and the refrigerant flow path  70  are provided in paths independent from each other, and the oils flowing inside do not mix with each other. 
     Next, various modifications that can be adopted in the above-described embodiment will be described. In the description of each modification described below, the same reference numerals are given to the same components as those of the embodiment and modification described above, and the description thereof will be omitted. 
       FIG.  10    is a schematic cross-sectional view of a drive apparatus  101  according to Modification 1. 
     The drive apparatus  101  of the present modification is different from the above-described embodiment mainly in the configurations of a first intra-side wall flow path  193 , a first intra-housing flow path  194 , and a second intra-side wall flow path  195 . 
     Similarly to the above-described embodiment, the housing  106  of the present modification includes a motor accommodating portion  181  and a gear accommodating portion  182 . The gear accommodating portion  182  is provided with the fluid reservoir P that stores the fluid O. The housing  106  of the present modification includes a first side wall portion  106   a,  a second side wall portion  106   b,  and a third side wall portion  106   c  extending along a plane orthogonal to the motor axis J 1 . 
     In the present modification, the first side wall portion  106   a  is located on the other side (−Y side) in the axial direction of the motor  2 , and defines the internal space of the motor accommodating portion  181  and the internal space of the gear accommodating portion  182 . The second side wall portion  106   b  is located on one side (+Y side) in the axial direction of the motor  2 . The third side wall portion  106   c  is disposed on the other side (−Y side) in the axial direction of the transmission mechanism  3 . 
     A flow path  190  of the present modification includes a suction flow path  191 , a discharge flow path  192 , a first intra-side wall flow path  193 , a first intra-housing flow path  194 , a second intra-side wall flow path  195 , a second intra-housing flow path  196 , a first intra-shaft flow path  197 A, and a third intra-housing flow path  198 . The flow path  190  of the present modification may further include a third intra-side wall flow path  99  and a second intra-shaft flow path  97 B similar to those of the above-described embodiment. In this case, the third intra-side wall flow path  99  is connected to the third intra-housing flow path  198 , and the second intra-shaft flow path  97 B is connected to the third intra-side wall flow path  99 . 
     The suction flow path  191  connects the fluid reservoir P and the pump  8 . The discharge flow path  192  extends from the pump  8  to the first side wall portion  106   a.  The discharge flow path  192  connects the pump  8  and the first intra-side wall flow path  193 . The first intra-side wall flow path  193  is connected to the first intra-housing flow path  194  and is provided in the wall of the first side wall portion  106   a.    
     The first intra-housing flow path  194  extends along the axial direction inside the motor accommodating portion  181 . The fluid O in the first intra-housing flow path  194  flows from the other side (−Y side) in the axial direction toward one side (+Y side). 
     The third intra-housing flow path  198  is connected to the first intra-side wall flow path  193  and extends inside the gear accommodating portion  182  along the axial direction. The fluid O in the third intra-housing flow path  198  flows from one side (+Y side) in the axial direction toward the other side (−Y side). 
     The second intra-side wall flow path  195  is connected to the first intra-housing flow path  194  and is provided in the wall of the second side wall portion  106   b.    
     The first intra-shaft flow path  197 A is connected to the second intra-side wall flow path  195  and is provided in the hollow portion of the motor shaft  21 A. 
     The second intra-housing flow path  196  is connected to the second intra-side wall flow path  195  and extends inside the motor accommodating portion  181  along the axial direction. The fluid O in the second intra-housing flow path  196  flows from one side (+Y side) in the axial direction toward the other side (−Y side). 
     According to the present modification, the side wall portion (first side wall portion  106   a ) that feeds the fluid O to the first intra-housing flow path  194  and the side wall portion (second side wall portion  106   b ) that feeds the fluid O to the second intra-housing flow path  196  are disposed on the opposite side in the axial direction across the motor  2 . Therefore, as compared with a case where the fluid O is fed from one intra-side wall flow path to the first intra-housing flow path  194  and the second intra-housing flow path  196 , the respective intra-side wall flow paths  193  and  195  can be shortened and simplified, and it is possible to suppress deterioration in strength and rigidity of the first side wall portion  106   a  and the second side wall portion  106   b.  In addition, it is possible to suppress restriction of arrangement of other configurations attached to the first side wall portion  106   a  and the second side wall portion  106   b  as compared with a case where a complicated intra-side wall flow path is disposed in any one of the first side wall portion  106   a  and the second side wall portion  106   b.    
       FIG.  11    is a schematic cross-sectional view of a drive apparatus  201  according to Modification 2. 
     The drive apparatus  201  of the present modification is different from the above-described embodiment mainly in the configuration of a first intra-housing flow path  294 . 
     Similarly to the above-described embodiment, a housing  206  of the present modification includes a motor accommodating portion  281  and a gear accommodating portion  282 . The housing  206  of the present modification includes a side wall portion  206   b  that defines the internal space of the motor accommodating portion  281  and the internal space of the gear accommodating portion  282 . 
     The side wall portion  206   b  is provided with a first gear facing surface (gear facing surface)  206   p  facing the transmission mechanism  3  (not illustrated in  FIG.  11   ). The bearing holder  60 H that supports the differential case shaft  50   a  of the transmission mechanism  3  via the bearing  5 H is provided on the first gear facing surface  206   p.    
     The bearing holder  60 H has a cylindrical portion  206   f  protruding from the first gear facing surface  206   p  and surrounding the bearing  5 H. The side wall portion  206   b  has a bottom region  206   s  surrounded by the cylindrical portion  206   f.  A through hole (opening)  206   h  penetrating the side wall portion  206   b  in the thickness direction is provided in the bottom region  206   s.  The through hole  206   h  overlaps the bearing  5 H when viewed from the axial direction of the output axis J 3 . Therefore, the through hole  206   h  exposes the bearing  5 H to the internal space of the motor accommodating portion  281 . A second feed hole  294   b  of the first intra-housing flow path  294  opens toward the through hole  206   h  and the bearing  5 H. 
     The flow path  290  of the present modification includes the first intra-housing flow path  294  extending inside the motor accommodating portion  281 . The first intra-housing flow path  294  extends along a plane orthogonal to the motor axis J 1 . The first intra-housing flow path  294  is provided with a first feed hole  294   a  and a second feed hole  294   b.  The first feed hole  294   a  feeds the fluid O to the motor  2 . On the other hand, the second feed hole  294   b  feeds the fluid O to the bearing  5 H. 
     The fluid O ejected from the second feed hole  294   b  passes through the through hole  206   h  and is fed to the bearing  5 H. As a result, the fluid O lubricates the bearing  5 H. According to the present modification, the bearing  5 H disposed in the gear accommodating portion  282  can be lubricated from the pipe-shaped first intra-housing flow path  294  disposed in the motor accommodating portion  281 . 
     In the present modification, the case where the through hole  206   h  is provided in the bottom region  206   s  as the opening through which the fluid O from the second feed hole  294   b  passes has been described. Even with such a configuration, the fluid O ejected from the second feed hole  294   b  can be fed to the bearing  5 H, similarly to the above-described embodiment. 
     While various embodiments of the present invention and modifications thereof have been described above, it will be understood that features, a combination of the features, and so on according to each of the embodiments and the modifications thereof are only illustrative, and that an addition, elimination, and substitution of a feature(s), and other modifications can be made without departing from the scope and spirit of the present invention. Also note that the present invention is not limited by the embodiment. 
     Features of the above-described preferred embodiments and the modifications thereof may be combined appropriately as long as no conflict arises. 
     While preferred embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.