Patent Publication Number: US-2023132520-A1

Title: Rotating electrical machine and drive device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present invention claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2021-177844 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 rotating electrical machine and a drive device. 
     BACKGROUND 
     There is known a charge dissipation device that dissipates charges from a shaft of a rotating electrical machine. For example, a current shunt ring having a conductive segment in contact with the shaft is conventionally known. 
     In a rotating electrical machine including the charge dissipation device as described above, there is a case where a fluid is supplied to a rotor, a stator, and the like for the purpose of cooling, for example. In this case, when the fluid is applied to the charge dissipation device, the conductivity of the charge dissipation device is reduced, and the charge is hardly dissipated in some cases. 
     SUMMARY 
     One aspect of an exemplary rotating electrical machine of the present invention includes: a rotor having a hollow shaft rotatable about a central axis; a stator opposing the rotor with a gap interposed therebetween; a housing internally accommodating the rotor and the stator; a bearing rotatably supporting the shaft; an electricity removal device fixed to the housing and in electrical contact with the shaft and the housing; a housing channel portion provided in the housing; a nozzle member having a nozzle through hole communicating with an inside of the shaft; and a seal member positioned between the shaft and the housing in a radial direction. The shaft includes a hollow first shaft portion, and a second shaft portion having a lid portion provided in a portion on a first axial side of the first shaft portion and an extension portion extending from the lid portion to the first axial side. The extension portion is axially passed through the nozzle through hole. The electricity removal device is in contact with a portion of the extension portion positioned on the first axial side relative to the nozzle through hole. The seal member is positioned on the first axial side relative to the nozzle member and on the second axial side relative to the electricity removal device. The shaft includes a connection channel portion communicating with an inside of the first shaft portion and an inside of the nozzle through hole. The housing channel portion opens toward an axial gap between the nozzle member and the seal member of an inside of the housing. 
     One aspect of an exemplary drive device of the present invention includes the above rotating electrical machine and a gear mechanism connected to the rotating electrical machine. 
     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 an outline configuration diagram schematically illustrating a drive device of an embodiment; 
         FIG.  2    is a cross-sectional view illustrating a part of a rotating electrical machine of an embodiment; 
         FIG.  3    is a perspective view illustrating a part of a motor housing of an embodiment, a part of a second shaft portion, and an electricity removal device; 
         FIG.  4    is an exploded perspective view illustrating a second shaft portion and a nozzle member of an embodiment; and 
         FIG.  5    is an exploded perspective view illustrating a second shaft portion and a nozzle member of an embodiment, and is a view of each member viewed from an angle different from that in  FIG.  4   . 
     
    
    
     DETAILED DESCRIPTION 
     The following description will be made with a vertical direction being defined on the basis of positional relationships in the case where a drive device of embodiments is equipped in a vehicle positioned on a horizontal road surface. That is, it is sufficient that the relative positional relationships regarding the vertical direction described in the following embodiments are satisfied at least in the case where the drive device is equipped in the vehicle positioned on the horizontal road surface. 
     In the drawings, an XYZ coordinate system is illustrated appropriately as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, a Z-axis direction corresponds to the vertical direction. An arrow in the Z-axis is directed toward a side (+Z side) that is an upper side in the vertical direction, and a side (−Z side) opposite to the side toward which the arrow in the Z-axis is directed is a lower side in the vertical direction. In the following description, the upper side and the lower side in the vertical direction will be referred to simply as the “upper side” and the “lower side”, respectively. An X-axis direction is orthogonal to the Z-axis direction and corresponds to a front-rear direction of the vehicle equipped with the drive device. In the following embodiments, a side (+X side) toward which an arrow in the X-axis is directed is a front side in the vehicle, and a side (−X side) opposite to the side toward which the arrow in the X-axis is directed is a rear side in the vehicle. A Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction and corresponds to a left-right direction of the vehicle, i.e., a vehicle lateral direction. In the following embodiments, a side (+Y side) toward which an arrow in the Y-axis is directed is a left side in the vehicle, and a side (−Y side) opposite to the side toward which the arrow in the Y-axis is directed is a right side in the vehicle. Each of the front-rear direction and the left-right direction is a horizontal direction orthogonal to the vertical direction. 
     A positional relationship in the front-rear direction is not limited to the positional relationship of the following embodiments. The side (+X side) toward which the arrow in the X-axis is directed may be the rear side in the vehicle, and the side (−X side) opposite to the side toward which the arrow in the X-axis is directed may be the front side in the vehicle. In this case, the side (+Y side) toward which the arrow in the Y-axis is directed is the right side in the vehicle, and the side (−Y side) opposite to the side toward which the arrow in the Y-axis is directed is the left side in the vehicle. In the present description, a “parallel direction” includes a substantially parallel direction, and an “orthogonal direction” includes a substantially orthogonal direction. 
     A central axis J illustrated in the drawings as appropriate is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction orthogonal to the vertical direction, i.e., in the left-right direction of the vehicle. In description below, unless otherwise particularly stated, a direction parallel to the central axis J is simply referred to as “axial direction”, a radial direction about the central axis J is simply referred to as “radial direction”, and a circumferential direction about the central axis J, i.e., a direction about the central axis J is simply referred to as “circumferential direction”. In the following embodiments, the right side (−Y side) is referred to as “first axial side”, and the left side (+Y side) is referred to as “second axial side”. 
     A drive device  100  of the present embodiment illustrated in  FIG.  1    is a drive device that is equipped in a vehicle and rotates an axle  64 . The vehicle equipped with the drive device  100  is a vehicle including a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV). As illustrated in  FIG.  1   , the drive device  100  includes a rotating electrical machine  10  and a gear mechanism  60 . The gear mechanism  60  is connected to the rotating electrical machine  10  and transmits the rotation of the rotating electrical machine  10 , that is, the rotation of a rotor  30  described later to the axle  64  of the vehicle. The gear mechanism  60  of the present embodiment includes a gear housing  61 , a speed reducer  62  connected to the rotating electrical machine  10 , and a differential gear  63  connected to the speed reducer  62 . 
     The gear housing  61  internally accommodates the speed reducer  62 , the differential gear  63 , and oil O. The oil O is stored in a lower region in the gear housing  61 . The oil O circulates in a refrigerant channel portion  90  described later. The oil O is used as a refrigerant for cooling the rotating electrical machine  10 . The oil O is also used as lubricating oil for the speed reducer  62  and the differential gear  63 . As the oil O, for example, an oil equivalent to an automatic transmission fluid (ATF) having a relatively low viscosity is preferably used to function as a refrigerant and lubricating oil. 
     The differential gear  63  includes a ring gear  63   a . Torque output from the rotating electrical machine  10  is transmitted the ring gear  63   a  through the speed reducer  62 . The ring gear  63   a  has a lower end portion immersed in the oil O stored in the gear housing  61 . When the ring gear  63   a  rotates, the oil O is scraped up. The oil O scraped up is supplied to, for example, the speed reducer  62  and the differential gear  63  as lubricating oil. 
     The rotating electrical machine  10  is a portion that drives the drive device  100 . The rotating electrical machine  10  is positioned, for example, on a first axial side (−Y side) of the gear mechanism  60 . In the present embodiment, the rotating electrical machine  10  is a motor. The rotating electrical machine  10  includes a motor housing  20 , the rotor  30  having a shaft  31 , bearings  34  and  35  that rotatably support the rotor  30 , a stator  40 , a resolver  50 , a nozzle member  70 , an electricity removal device  80 , and a seal member  120 . The bearings  34  and  35  are each a ball bearing, for example. 
     In the present embodiment, the bearings  34  and  35  are ceramic ball bearings. The bearing  34  rotatably supports a portion of the shaft  31  positioned on the second axial side (+Y side) relative to the stator  40 . The bearing  35  rotatably supports a portion of the shaft  31  positioned on the first axial side (−Y side) relative to the stator  40 . As illustrated in  FIG.  2   , the bearing  35  includes an inner ring  35   a  having an annular shape about the central axis J, an outer ring  35   b  having an annular shape about the central axis J and positioned radially outside the inner ring  35   a , and a plurality of balls  35   c  positioned radially between the inner ring  35   a  and the outer ring  35   b . The configuration of the bearing  34  is similar to the configuration of the bearing  35 . 
     The motor housing  20  is a housing that internally accommodates the rotor  30  and the stator  40 . The motor housing  20  communicates with the gear housing  61  on the first axial side (−Y side). The motor housing  20  has a body portion  21 , a partition wall portion  22 , and a motor cover  23 . The body portion  21  and the partition wall portion  22  are each, for example, a part of an identical single member. The motor cover  23  is separate from, for example, the body portion  21  and the partition wall portion  22 . 
     The body portion  21  is in a tubular shape that surrounds the central axis J and opens on the first axial side (−Y side). The partition wall portion  22  communicates with an end portion of the body portion  21  on the second axial side (+Y side). The partition wall portion  22  axially partitions the inside of the motor housing  20  and the inside of the gear housing  61 . The partition wall portion  22  has a partition wall opening  22   a  that allows the inside of the motor housing  20  and the inside of the gear housing  61  to communicate with each other. The partition wall portion  22  holds the bearing  34 . The motor cover  23  is fixed to an end portion of the body portion  21  on the first axial side. The motor cover  23  closes an opening of the body portion  21  on the first axial side. The motor cover  23  holds the bearing  35 . 
     As illustrated in  FIG.  2   , the motor cover  23  has a hole portion  23   f  recessed from a surface on the second axial side (+Y side) to the first axial side (−Y side) of the motor cover  23 . The hole portion  23   f  is a hole that has a bottom portion on the first axial side and opens on the second axial side. In the present embodiment, the hole portion  23   f  is a circular hole about the central axis J. Providing the hole portion  23   f  provides the motor cover  23  with a bottom wall portion  23   a  and a peripheral wall portion  23   b . That is, the motor housing  20  includes the bottom wall portion  23   a  and the peripheral wall portion  23   b.    
     The bottom wall portion  23   a  is the bottom portion of the hole portion  23   f . A surface of the bottom wall portion  23   a  on the second axial side (+Y side) is provided with a second recess portion  23   g  recessed on the first axial side. When viewed axially, the inner edge of the second recess portion  23   g  has a circular shape about the central axis J. 
     The peripheral wall portion  23   b  protrudes from a radially outer peripheral edge portion of the bottom wall portion  23   a  on the second axial side (+Y side). The peripheral wall portion  23   b  surrounds the shaft  31 . The peripheral wall portion  23   b  has an inner peripheral surface that is an inner peripheral surface of the hole portion  23   f . In the present embodiment, the inner peripheral surface of the peripheral wall portion  23   b  has a cylindrical shape about the central axis J. 
     The peripheral wall portion  23   b  includes a first wall portion  23   c , a second wall portion  23   d , and a third wall portion  23   e . The first wall portion  23   c  is a portion communicating with a radially outer peripheral edge portion of the bottom wall portion  23   a . The second wall portion  23   d  communicates with the first wall portion  23   c  on the second axial side (+Y side). The second wall portion  23   d  has a larger inner diameter than that of the first wall portion  23   c . The second wall portion  23   d  has a larger axial dimension than that of the first wall portion  23   c . The third wall portion  23   e  communicates with the second wall portion  23   d  on the second axial side. The third wall portion  23   e  has a larger inner diameter than that of the second wall portion  23   d . The third wall portion  23   e  has a larger axial dimension than that of the second wall portion  23   d . The bearing  35  is held on the radially inner side the third wall portion  23   e . That is, the bearing  35  is held in the peripheral wall portion  23   b . The outer ring  35   b  of the bearing  35  is fitted to the radially inner side of the third wall portion  23   e.    
     In the present embodiment, the inner peripheral surface of the peripheral wall portion  23   b  has a first stepped portion  24   a  and a second stepped portion  24   b . The first stepped portion  24   a  is a step provided axially between an inner peripheral surface of the first wall portion  23   c  and an inner peripheral surface of the second wall portion  23   d . The first stepped portion  24   a  has a first stepped surface  24   c  facing the second axial side (+Y side). The first stepped surface  24   c  has an annular shape about the central axis J. The first stepped surface  24   c  is a flat surface orthogonal to the axial direction. The second stepped portion  24   b  is a step provided axially between an inner peripheral surface of the second wall portion  23   d  and an inner peripheral surface of the third wall portion  23   e . The second stepped portion  24   b  has a second stepped surface  24   d  facing the second axial side. The second stepped surface  24   d  has an annular shape about the central axis J. The second stepped surface  24   d  is a flat surface orthogonal to the axial direction. The bearing  35  held in the third wall portion  23   e  is in contact with the second stepped surface  24   d . Therefore, the bearing  35  can be suitably positioned axially with respect to the motor housing  20 . More specifically, the outer ring  35   b  of the bearing  35  is in contact with the second stepped surface  24   d  from the second axial side. 
     A surface of the motor cover  23  on the second axial side (+Y side) is provided with a resolver holding portion  25 . In the present embodiment, the resolver holding portion  25  is provided on the peripheral edge portion of the hole portion  23   f  of the surface of the motor cover  23  on the second axial side. The resolver holding portion  25  extends in the circumferential direction and surrounds the shaft  31 . 
     The motor housing  20  has a through hole  23   h  axially penetrating the bottom wall portion  23   a . The through hole  23   h  is a circular hole about the central axis J. The through hole  23   h  has a large-diameter hole portion  23   i  and a small-diameter hole portion  23   j . The large-diameter hole portion  23   i  is open to the bottom surface of the second recess portion  23   g  of the surface on the second axial side (+Y side) of the bottom wall portion  23   a . The small-diameter hole portion  23   j  communicates with the first axial side (−Y side) of the large-diameter hole portion  23   i  via a step. The inner diameter of the small-diameter hole portion  23   j  is smaller than the inner diameter of the large-diameter hole portion  23   i . The small-diameter hole portion  23   j  opens on the surface on the first axial side of the bottom wall portion  23   a . The axial dimension of the small-diameter hole portion  23   j  is smaller than the axial dimension of the large-diameter hole portion  23   i.    
     The motor housing  20  includes an accommodation portion  26  that internally accommodates the electricity removal device  80 . The accommodation portion  26  is provided on a surface of the first axial side (−Y side) of the motor cover  23 . The accommodation portion  26  protrudes from the motor cover  23  to the first axial side. The accommodation portion  26  includes a tubular portion  26   a  and a lid body  26   b . The tubular portion  26   a  protrudes from the surface on the first axial side of the motor cover  23  to the first axial side. As illustrated in  FIG.  3   , the tubular portion  26   a  has a substantially cylindrical shape that opens on the first axial side. The central axis of the tubular portion  26   a  is parallel to the central axis J of the rotating electrical machine  10  and is provided at a position eccentric in the radial direction with respect to the central axis J. The central axis of the tubular portion  26   a  is positioned lower than the central axis J, for example. 
     The tubular portion  26   a  surrounds the through hole  23   h  when viewed axially. When viewed axially, a part of the bottom wall portion  23   a  is positioned inside the tubular portion  26   a . In the present embodiment, the tubular portion  26   a  and the motor cover  23  are a part of an identical single member. The tubular portion  26   a  has a plurality of female screw holes  26   c . The plurality of female screw holes  26   c  are provided on the surface on the first axial side (−Y side) of the tubular portion  26   a.    
     As illustrated in  FIG.  2   , the lid body  26   b  is fixed to the first axial side (−Y side) of the tubular portion  26   a . Although not illustrated, the lid body  26   b  is fixed to the tubular portion  26   a  by bolts respectively tightened into the plurality of female screw holes  26   c . The lid body  26   b  has a plate shape whose plate surface faces the axial direction. 
     As illustrated in  FIG.  3   , the motor housing  20  has a support column portion  26   d . The support column portion  26   d  protrudes to the first axial side from a portion positioned inside the tubular portion  26   a  when viewed axially of the surface on the first axial side (−Y side) of the motor cover  23 . The support column portion  26   d  has a columnar shape. The support column portion  26   d  is positioned in the accommodation portion  26 . A pair of support column portions  26   d  are provided at intervals in a direction orthogonal to the axial direction. When viewed axially, the through hole  23   h  is not positioned between the pair of support column portions  26   d . That is, the through hole  23   h  is disposed to be shifted in a direction orthogonal to the axial direction from between the pair of support column portions  26   d.    
     As illustrated in  FIG.  1   , the rotor  30  includes the shaft  31  and a rotor body  32 . Although not illustrated, the rotor body  32  includes a rotor core, and a rotor magnet fixed to the rotor core. The torque of the rotor  30  is transmitted to the gear mechanism  60 . 
     The shaft  31  is rotatable about the central axis J. The shaft  31  is rotatably supported by the bearings  34  and  35 . The shaft  31  is a hollow shaft. The shaft  31  has a cylindrical shape that extends axially about the central axis J. The shaft  31  is provided with a hole portion  33  that allows the inside of the shaft  31  and an outside of the shaft  31  to communicate with each other. The shaft  31  extends across the inside of the motor housing  20  and the inside of the gear housing  61 . The shaft  31  has an end portion on the second axial side (+Y side) that protrudes into the inside of the gear housing  61 . The shaft  31  is connected at the end portion on the second axial side with the speed reducer  62 . 
     The shaft  31  includes a hollow first shaft portion  31   a  and a second shaft portion  110 . In the present embodiment, the first shaft portion  31   a  and the second shaft portion  110  are separate bodies from each other. The first shaft portion  31   a  has a cylindrical shape extending axially about the central axis J. The first shaft portion  31   a  is open on both axial sides. The first shaft portion  31   a  extends across the inside of the motor housing  20  and the inside of the gear housing  61 . The first shaft portion  31   a  is rotatably supported by the bearings  34  and  35 . For example, the first shaft portion  31   a  may be configured by axially coupling a motor shaft positioned in the motor housing  20  and a gear shaft positioned in the gear housing  61 . 
     As illustrated in  FIG.  2   , the first shaft portion  31   a  includes a large-diameter portion  31   b  and a small-diameter portion  31   c . The small-diameter portion  31   c  communicates with the first axial side (−Y side) of the large-diameter portion  31   b . The outer diameter of the small-diameter portion  31   c  is smaller than the outer diameter of the large-diameter portion  31   b . The axial dimension of the small-diameter portion  31   c  is smaller than the axial dimension of the large-diameter portion  31   b . The end portion on the first axial side of the small-diameter portion  31   c  is an end portion on the first axial side of the first shaft portion  31   a . A stepped portion having a stepped surface facing the first axial side is provided between an outer peripheral surface of the large-diameter portion  31   b  and an outer peripheral surface of the small-diameter portion  31   c.    
     A portion on the first axial side (−Y side) of the small-diameter portion  31   c  is positioned radially inside the peripheral wall portion  23   b . More specifically, the portion on the first axial side of the small-diameter portion  31   c  is positioned radially inside the third wall portion  23   e . The outer peripheral surface of the small-diameter portion  31   c  is disposed radially inward away from the inner peripheral surface of the peripheral wall portion  23   b . The inner ring  35   a  of the bearing  35  is fixed to an outer peripheral surface of the small-diameter portion  31   c . In the present embodiment, the axial position at the end portion on the first axial side of the small-diameter portion  31   c  is the same as the axial position at the end portion on the first axial side of the bearing  35 . A stop ring  36  is attached to the outer peripheral surface of the small-diameter portion  31   c . The stop ring  36  is disposed to oppose the second axial side (+Y side) of the inner ring  35   a  of the bearing  35 . 
     The second shaft portion  110  is coupled to the first axial side (−Y side) of the first shaft portion  31   a . The second shaft portion  110  is fixed to an opening portion on the first axial side of the first shaft portion  31   a . As illustrated in  FIGS.  4  and  5   , the second shaft portion  110  has a columnar shape extending axially about the central axis J. The second shaft portion  110  includes a lid portion  111  and an extension portion  112 . 
     The lid portion  111  has a columnar shape about the central axis J. As illustrated in  FIG.  2   , the lid portion  111  is provided on a portion on the first axial side (−Y side) of the first shaft portion  31   a . In the present embodiment, the lid portion  111  is provided at the end portion on the first axial side of the first shaft portion  31   a . The lid portion  111  is fitted in the end portion on the first axial side of the first shaft portion  31   a . The lid portion  111  is press-fitted into the first shaft portion  31   a . Due to this, the second shaft portion  110  is fixed to the first shaft portion  31   a.    
     The lid portion  111  is positioned radially inside the bearing  35 . The lid portion  111  overlaps the bearing  35  in the radial direction. In other words, the lid portion  111  overlaps the bearing  35  when viewed in the radial direction. In the present embodiment, the axial position at the end portion on the first axial side (−Y side) of the lid portion  111  is the same as the axial position at the end portion on the first axial side of the first shaft portion  31   a  and the axial position at the end portion on the first axial side of the bearing  35 . An end surface on the first axial side of the lid portion  111 , an end surface on the first axial side of the first shaft portion  31   a , and an end surface on the first axial side of the inner ring  35   a  of the bearing  35  are disposed on the identical virtual plane orthogonal to the axial direction. 
     The lid portion  111  has a first recess portion  113  as a recess portion recessed from the surface on the first axial side (−Y side) of the lid portion  111  to the second axial side (+Y side). As illustrated in  FIG.  5   , the inner peripheral edge portion of the first recess portion  113  has a circular shape about the central axis J when viewed axially. As illustrated in  FIG.  2   , the axial dimension of the first recess portion  113  is larger than half of the axial dimension of the lid portion  111 . 
     The lid portion  111  has a lid portion through hole  114  axially penetrating the lid portion  111 . In the present embodiment, the lid portion through hole  114  axially penetrates a portion of the lid portion  111  provided with the first recess portion  113 . An end portion on the first axial side (−Y side) of the lid portion through hole  114  is open inside the first recess portion  113 . As illustrated in  FIG.  5   , the end portion on the first axial side (−Y side) of the lid portion through hole  114  is open across a bottom surface  113   a  positioned on the second axial side (+Y side) of the inner surface of the first recess portion  113  and an inner peripheral surface  113   b  positioned on the radially outside of the inner surface of the first recess portion  113 . 
     As illustrated in  FIG.  2   , the end portion on the second axial side (+Y side) of the lid portion through hole  114  is open to the end surface on the second axial side of the lid portion  111 . The end portion on the second axial side of the lid portion through hole  114  is open in the first shaft portion  31   a . The lid portion through hole  114  is a circular hole. The inner diameter of the lid portion through hole  114  increases toward the second axial side. The inner peripheral surface of the lid portion through hole  114  has a cylindrical shape whose inner diameter linearly increases toward the second axial side. The shape of the inner peripheral surface of the lid portion through hole  114  is similar to the outer peripheral surface of a truncated cone whose outer diameter increases toward the second axial side. The lid portion through hole  114  is positioned radially outside the central axis J. As illustrated in  FIG.  4   , a plurality of the lid portion through holes  114  are provided at intervals in the circumferential direction. The plurality of lid portion through holes  114  are arranged at equal intervals over the entire circumference along the circumferential direction. In the present embodiment, six of the lid portion through holes  114  are provided. 
     In the present embodiment, each of the lid portion through holes  114  constitutes a connection channel portion  115 . That is, the shaft  31  has the connection channel portion  115 . The inner peripheral surface of the connection channel portion  115  is an inner peripheral surface of the lid portion through hole  114 . The connection channel portion  115  is provided in the lid portion  111 . In the present embodiment, a plurality of the connection channel portions  115  are provided to surround the extension portion  112  when viewed axially. The plurality of connection channel portions  115  are arranged at equal intervals over the entire circumference along the circumferential direction. In the present embodiment, six of the connection channel portions  115  are provided. 
     In the present embodiment, since the connection channel portion  115  is provided in the lid portion  111 , the connection channel portion  115  can be easily made by providing the lid portion through hole  114  penetrating the lid portion  111  in the axial direction. Therefore, it is easy to make the connection channel portion  115  as compared with a case where the connection channel portion  115  is provided in the extension portion  112 , for example. 
     As illustrated in  FIG.  2   , the connection channel portion  115  extends in the axial direction. In the present embodiment, the connection channel portion  115  allows the inside of the first shaft portion  31   a  and the inside of the first recess portion  113  to communicate with each other. The connection channel portion  115  is open to the inside of the first shaft portion  31   a  and the inside of the first recess portion  113 . In the present embodiment, the connection channel portion  115  communicates with the inside of a nozzle through hole  70   a  described later via the inside of the first recess portion  113 . Due to this, the connection channel portion  115  communicates with the inside of the first shaft portion  31   a  and the inside of the nozzle through hole  70   a . As illustrated in  FIG.  5   , the connection channel portion  115  is open across a bottom surface  113   a  positioned on the second axial side (+Y side) of the inner surface of the first recess portion  113  and an inner peripheral surface  113   b  positioned on the radially outside of the inner surface of the first recess portion  113 . 
     As illustrated in  FIG.  2   , the channel cross-sectional area of the connection channel portion  115  increases toward the second axial side (+Y side). That is, the channel cross-sectional area of the connection channel portion  115  increases toward the inside of the first shaft portion  31   a . In the present embodiment, the channel cross-sectional area of the connection channel portion  115  is the area inside the connection channel portion  115  in the cross section orthogonal to the axial direction. A portion positioned on the radially outside of the inner peripheral surface of the connection channel portion  115  is positioned on the radially outward toward the second axial side. That is, a portion of the inner peripheral surface of the connection channel portion  115  positioned on the radially outside is positioned on the radially outside toward the inside of the first shaft portion  31   a.    
     The extension portion  112  extends from the lid portion  111  to the first axial side (−Y side). The extension portion  112  has a columnar shape about the central axis J. The outer diameter of the extension portion  112  is smaller than the outer diameter of the lid portion  111  and the inner diameter of the first recess portion  113 . In the present embodiment, the extension portion  112  extends to the first axial side from a surface positioned on the second axial side (+Y side) of the inner surface of the first recess portion  113 , that is, the bottom surface  113   a . The end portion on the second axial side of the extension portion  112  is positioned in the first recess portion  113 . The outer peripheral surface of the extension portion  112  is disposed radially inward away from the inner peripheral surface  113   b  of the first recess portion  113 . The extension portion  112  protrudes to the first axial side relative to the inside of the first recess portion  113 . 
     The extension portion  112  is axially passed through the through hole  23   h . The outer peripheral surface of the extension portion  112  is disposed radially inward away from the inner peripheral surface of the through hole  23   h . The end portion on the first axial side (−Y side) of the extension portion  112  is positioned inside the accommodation portion  26 . The axial dimension of the extension portion  112  is larger than the axial dimension of the lid portion  111 . The axial dimension of the portion of the extension portion  112  positioned on the first axial side relative to the inside of the first recess portion  113  is larger than the axial dimension of the lid portion  111 . 
     As illustrated in  FIG.  1   , the stator  40  opposes the rotor  30  across a gap in the radial direction. More specifically, the stator  40  is positioned radially outward of the rotor  30 . The stator  40  is fixed inside the motor housing  20 . The stator  40  includes a stator core  41  and a coil assembly  42 . 
     The stator core  41  has an annular shape surrounding the central axis J of the rotating electrical machine  10 . The stator core  41  is positioned radially outside the rotor  30 . The stator core  41  surrounds the rotor  30 . The stator core  41  is composed of, for example, a plurality of plate members such as electromagnetic steel plates stacked in the axial direction. Although not illustrated, the stator core  41  includes a core back in a cylindrical shape extending axially, and a plurality of teeth extending to a radial inside from the core back. 
     The coil assembly  42  includes a plurality of coils  42   c  attached to the stator core  41  along the circumferential direction. The plurality of coils  42   c  are mounted on the respective teeth of the stator core  41  through insulators (not illustrated). The coil assembly  42  includes coil ends  42   a  and  42   b  that protrude axially from the stator core  41 . 
     The resolver  50  can detect rotation of the rotor  30 . The resolver  50  is accommodated inside the motor housing  20 . The resolver  50  includes a resolver rotor  51  and a resolver stator  52 . The resolver rotor  51  is fixed to the shaft  31 . The resolver rotor  51  is in an annular shape surrounding the shaft  31 . In the present embodiment, the resolver rotor  51  has an annular shape about the central axis J. As illustrated in  FIG.  2   , in the present embodiment, the resolver rotor  51  surrounds an end portion on the second axial side (+Y side) of the small-diameter portion  31   c . The resolver rotor  51  has a plate shape whose plate surface faces the axial direction. The surface on the second axial side of the resolver rotor  51  is in contact with a stepped surface of the stepped portion provided axially between the large-diameter portion  31   b  and the small-diameter portion  31   c . The resolver rotor  51  protrudes radially outward relative to the outer peripheral surface of the large-diameter portion  31   b . The resolver rotor  51  is disposed at intervals on the second axial side of the bearing  35 . 
     The resolver stator  52  is positioned radially outside the resolver rotor  51 . The resolver stator  52  is in an annular shape surrounding the resolver rotor  51 . The resolver stator  52  is held by the resolver holding portion  25 . Although not illustrated, the resolver stator  52  includes a coil. When the resolver rotor  51  rotates together with the shaft  31 , induced voltage corresponding to a circumferential position of the resolver rotor  51  is generated in the coil of the resolver stator  52 . The resolver  50  can detect rotation of the resolver rotor  51  and the shaft  31  based on change in the induced voltage generated in the coil of the resolver stator  52 . This enables the resolver  50  to detect rotation of the rotor  30 . 
     The electricity removal device  80  is accommodated inside the accommodation portion  26 . As illustrated in  FIG.  3   , the electricity removal device  80  is positioned radially outside a portion of the extension portion  112  positioned in the accommodation portion  26 . The electricity removal device  80  is positioned below the extension portion  112 , for example. The electricity removal device  80  includes a holder portion  81 , a brush portion  82 , and a fixed portion  83 . In the present embodiment, the holder portion  81  has a radially long rectangular parallelepiped shape. The holder portion  81  holds the brush portion  82 . 
     The brush portion  82  protrudes radially inward from the holder portion  81 . The brush portion  82  has a substantially rectangular parallelepiped shape. In the present embodiment, the brush portion  82  is a carbon brush. The brush portion  82  is positioned radially outside the extension portion  112 . The radially inner end portion of the brush portion  82  is in electrical contact with the outer peripheral surface of the extension portion  112 . Due to this, the electricity removal device  80  is in electrical contact with the shaft  31 . In the present embodiment, the electricity removal device  80  is in contact with a portion of the extension portion  112  positioned on the first axial side (−Y side) relative to the nozzle through hole  70   a  described later. The shaft  31  rotates while the outer peripheral surface of the extension portion  112  is rubbed against the radially inner end portion of the brush portion  82 . In the present description, “an object is in electrical contact with another object” is sufficient if electric current can flow between the object and the other object. 
     The fixed portion  83  protrudes from the holder portion  81  in a direction orthogonal to both the axial direction and the direction in which the brush portion  82  protrudes from the holder portion  81 . The fixed portion  83  has a plate shape whose plate surface faces the axial direction. The fixed portion  83  is made of metal. Although not illustrated, the fixed portion  83  is electrically connected to the brush portion  82  inside the holder portion  81 , for example. A pair of the fixed portions  83  are provided with the holder portion  81  interposed therebetween in a direction orthogonal to both the axial direction and the direction in which the brush portion  82  protrudes from the holder portion  81 . The pair of fixed portions  83  are fixed to the pair of support column portions  26   d  with bolts. Due to this, the electricity removal device  80  is fixed to the motor housing  20 . The fixed portion  83  is in electrical contact with the motor housing  20  with the support column portion  26   d  interposed therebetween. Due to this, the electricity removal device  80  is in electrical contact with the motor housing  20 . 
     As described above, since the fixed portion  83  is electrically connected to the brush portion  82 , the brush portion  82  is in electrical contact with the shaft  31 , and the fixed portion  83  is in electrical contact with the motor housing  20 , whereby the shaft  31  and the motor housing  20  are electrically connected via the electricity removal device  80 . Therefore, the current generated in the shaft  31  can flow from the support column portion  26   d  to the motor housing  20  through the brush portion  82  and the fixed portion  83  in this order. This makes it possible to suppress the current from flowing from the shaft  31  to the bearings  34  and  35  that rotatably support the shaft  31 . Therefore, electrolytic corrosion can be prevented from occurring in the bearings  34  and  35 . 
     The nozzle member  70  is a member for supplying the oil O as a fluid to the inside of the shaft  31 . As illustrated in  FIG.  2   , the nozzle member  70  is formed by performing machining such as pressing on a metal plate member, for example. The nozzle member  70  is disposed inside the peripheral wall portion  23   b . The nozzle member  70  is disposed away on the second axial side (+Y side) of the bottom wall portion  23   a . The nozzle member  70  includes a supply tube portion  71 , a flange portion  72 , and a protruding tube portion  73 . 
     The supply tube portion  71  extends in the axial direction. In the present embodiment, the supply tube portion  71  is in a cylindrical shape about the central axis J. The supply tube portion  71  is open on both axial sides. The extension portion  112  is passed through the radially inner side of the supply tube portion  71  in the axial direction. The end portion on the second axial side (+Y side) of the supply tube portion  71  is positioned in the first recess portion  113 . The outer peripheral surface of the supply tube portion  71  is disposed radially inward away from the inner peripheral surface  113   b  of the first recess portion  113 . The supply tube portion  71  includes a discharge tube portion  71   a  and a guide tube portion  71   b . 
     The discharge tube portion  71   a  has a cylindrical shape that opens on the second axial side (+Y side) about the central axis J. The end portion on the second axial side of the discharge tube portion  71   a  is the end portion on the second axial side of the supply tube portion  71 . An inner diameter and an outer diameter of the discharge tube portion  71   a  are the same over the entire axial direction. The discharge tube portion  71   a  is open to the inside of the first recess portion  113 . A portion on the second axial side of the discharge tube portion  71   a  is positioned in the first recess portion  113 . The end portion on the second axial side of the discharge tube portion  71   a  is disposed on the first axial side (−Y side) away from the bottom surface  113   a  of the first recess portion  113 . The end portion on the second axial side of the discharge tube portion  71   a  axially opposes, via a gap, a portion of the bottom surface  113   a  of the first recess portion  113  on the radially inside relative to the portion where the connection channel portion  115  is opened. A portion on the first axial side (−Y side) of the discharge tube portion  71   a  is positioned on the first axial side relative to the inside of the first recess portion  113 . 
     The guide tube portion  71   b  communicates with the first axial side (−Y side) of the discharge tube portion  71   a . The guide tube portion  71   b  has a cylindrical shape that opens on the first axial side about the central axis J. The end portion on the first axial side of the guide tube portion  71   b  is an end portion on the first axial side of the supply tube portion  71 . The inner diameter and the outer diameter of the guide tube portion  71   b  increase toward the first axial side. The guide tube portion  71   b  is a truncated cone-shaped tube whose inner diameter and outer diameter increase toward the first axial side. The outer diameter at the end portion on the second axial side (+Y side) of the guide tube portion  71   b  is the same as the outer diameter at the end portion on the first axial side of the discharge tube portion  71   a , and is smaller than the inner diameter of the first recess portion  113 . The inner diameter at the end portion on the second axial side of the guide tube portion  71   b  is the same as the inner diameter at the end portion on the first axial side of the discharge tube portion  71   a . The outer diameter at the end portion on the first axial side of the guide tube portion  71   b  is larger than the inner diameter of the first recess portion  113 . 
     The guide tube portion  71   b  is disposed away on the first axial side (−Y side) of the lid portion  111 . The guide tube portion  71   b  opposes the lid portion  111  in the axial direction with a gap interposed therebetween. The guide tube portion  71   b  is positioned radially inside the second wall portion  23   d . The opening portion on the first axial side of the guide tube portion  71   b  opposes the second recess portion  23   g  in the axial direction with a gap interposed therebetween. The axial dimension of the guide tube portion  71   b  is larger than the axial dimension of the discharge tube portion  71   a.    
     The supply tube portion  71  constitutes the nozzle through hole  70   a . That is, the nozzle member  70  has the nozzle through hole  70   a . The inside of the nozzle through hole  70   a  is the inside of the supply tube portion  71 . The nozzle through hole  70   a  penetrates the nozzle member  70  in the axial direction. The nozzle through hole  70   a  is a circular hole about the central axis J. The inner diameter of the portion of the nozzle through hole  70   a  configured by the discharge tube portion  71   a  is the same over the entire axial direction. The inner diameter of the portion of the nozzle through hole  70   a  configured by the guide tube portion  71   b  increases toward the first axial side (−Y side). 
     The extension portion  112  is passed through the nozzle through hole  70   a  in the axial direction. The inner peripheral surface of the nozzle through hole  70   a  is disposed radially outward away from the outer peripheral surface of the extension portion  112 . A gap is provided over the entire circumference in the circumferential direction radially between the inner peripheral surface of the nozzle through hole  70   a  and the outer peripheral surface of the extension portion  112 . The oil O flowing in the nozzle through hole  70   a  flows through a radial gap between the inner peripheral surface of the nozzle through hole  70   a  and the outer peripheral surface of the extension portion  112 . The nozzle through hole  70   a  is open to the inside of the first recess portion  113 . In the present embodiment, the nozzle through hole  70   a  communicates with the inside of the shaft  31  via the inside of the first recess portion  113  and the connection channel portion  115 . 
     The opening portion on the second axial side (+Y side) of the nozzle through hole  70   a  is disposed away from the bottom surface  113   a  of the first recess portion  113  on the first axial side (−Y side). The opening portion on the second axial side of the nozzle through hole  70   a  axially opposes, via a gap, a portion of the bottom surface  113   a  of the first recess portion  113  on the radially inside relative to the portion where the connection channel portion  115  is opened. The inner edge in the opening portion on the second axial side of the nozzle through hole  70   a  is positioned on the radially inside relative to the opening portion open to the bottom surface  113   a  of the connection channel portion  115 . 
     The flange portion  72  extends radially outward from the supply tube portion  71 . In the present embodiment, the flange portion  72  protrudes radially outward from an end portion on the first axial side (−Y side) of the supply tube portion  71 . The flange portion  72  is in an annular shape surrounding the central axis J. In the present embodiment, the flange portion  72  has an annular shape about the central axis J. The flange portion  72  has a plate shape whose plate surface faces the axial direction. The radially outer edge portion of the flange portion  72  is in contact with the first stepped surface  24   c . A portion of the flange portion  72  excluding the radially outer edge portion opposes the bottom wall portion  23   a  in the axial direction with a gap interposed therebetween. The flange portion  72  is disposed to oppose the first axial side of the bearing  35 . As described above, in the present embodiment, a part of the nozzle member  70  opposes the bearing  35  in the axial direction. 
     The protruding tube portion  73  protrudes from the radially outer edge portion of the flange portion  72  to the second axial side (+Y side). The protruding tube portion  73  has a cylindrical shape about the central axis J. The protruding tube portion  73  is fitted with a gap on the radially inner side of the second wall portion  23   d . Due to this, the nozzle member  70  is fitted inside the peripheral wall portion  23   b . The end portion on the second axial side of the protruding tube portion  73  opposes the bearing  35  in the axial direction. The end portion on the second axial side of the protruding tube portion  73  is in contact with the outer ring  35   b  of the bearing  35 . The end portion on the second axial side of the protruding tube portion  73  is positioned on the first axial side (−Y side) relative to the end portion on the second axial side of the supply tube portion  71 . The inner peripheral surface of the protruding tube portion  73  is positioned on the radial outside relative to the inner peripheral surface of the outer ring  35   b  of the bearing  35 . At least a part of the outer peripheral surface of the protruding tube portion  73  is in contact with the inner peripheral surface of the second wall portion  23   d , for example. 
     In the present embodiment, since the flange portion  72  is in contact with the first stepped surface  24   c  and the protruding tube portion  73  is in contact with the bearing  35 , the nozzle member  70  is positioned axially. In the present embodiment, by disposing the bearing  35  after disposing the nozzle member  70  in the peripheral wall portion  23   b , the nozzle member  70  can be fixed in the axial direction by the bearing  35 . The flange portion  72  and the first stepped surface  24   c  may oppose each other with a gap interposed therebetween without being in contact with each other, or the protruding tube portion  73  and the bearing  35  may oppose each other with a gap interposed therebetween without being in contact with each other. 
     The nozzle member  70  has a penetration portion  74  axially penetrating a portion of the nozzle member  70  opposing the bearing  35  in the axial direction. In the present embodiment, a portion of the nozzle member  70  opposing the bearing  35  in the axial direction includes the flange portion  72  and the protruding tube portion  73 . In the present embodiment, the penetration portion  74  is provided in the flange portion  72 . As illustrated in  FIGS.  4  and  5   , the penetration portion  74  is a circular hole penetrating the flange portion  72  in the axial direction. A plurality of the penetration portions  74  are provided at intervals in the circumferential direction. In the present embodiment, two of the penetration portions  74  are provided radially across the central axis J. As illustrated in  FIG.  2   , the penetration portion  74  axially opposes the inner ring  35   a  of the bearing  35  with a gap interposed therebetween. The penetration portion  74  is a supply hole for supplying the oil O as a fluid to the bearing  35 . The inner diameter of the penetration portion  74  is smaller than the inner diameter of the nozzle through hole  70   a.    
     The seal member  120  has an annular shape surrounding the shaft  31 . In the present embodiment, the seal member  120  has an annular shape about the central axis J. The seal member  120  is positioned radially between the shaft  31  and the motor housing  20 . In the present embodiment, the seal member  120  is fixed in the large-diameter hole portion  23   i  of the through hole  23   h  provided in the bottom wall portion  23   a . The seal member  120  is positioned on the first axial side (−Y side) relative to the nozzle member  70  and on the second axial side (+Y side) relative to the electricity removal device  80 . 
     The radially outer edge portion of the seal member  120  is in contact with the inner peripheral surface of the large-diameter hole portion  23   i . The radially inner edge portion of the seal member  120  is in contact with the outer peripheral surface of the extension portion  112 . Due to this, the seal member  120  seals radially between the inner peripheral surface of the large-diameter hole portion  23   i  and the outer peripheral surface of the extension portion  112 . In the present embodiment, the radially inner edge portion of the seal member  120  is elastically deformable in the radial direction, and is pressed against the outer peripheral surface of the extension portion  112  by an elastic force. In the present embodiment, the seal member  120  is an oil seal. 
     As illustrated in  FIG.  1   , the drive device  100  in the present embodiment is provided with the refrigerant channel portion  90  through which the oil O as a refrigerant circulates. The refrigerant channel portion  90  is provided across the inside of the motor housing  20  and the inside of the gear housing  61 . The refrigerant channel portion  90  is a channel through which the oil O stored in the gear housing  61  is supplied to the rotating electrical machine  10  and returns to the inside of the gear housing  61  again. The refrigerant channel portion  90  is provided with a pump  96 , a cooler  97 , and the refrigerant supply portion  95 . In the following description, an upstream side in a flow direction of the oil O in the refrigerant channel portion  90  is simply referred to as “upstream side”, and a downstream side in the flow direction of the oil O in the refrigerant channel portion  90  is simply referred to as “downstream side”. The refrigerant channel portion  90  includes a gear-side channel portion  91 , an intermediate channel portion  92 , and a rotating electrical machine-side channel portion  93 . 
     The gear-side channel portion  91  includes a first portion  91   a  and a second portion  91   b . The first portion  91   a  and the second portion  91   b  are provided in a wall portion of the gear housing  61 , for example. The first portion  91   a  allows a portion inside the gear housing  61  where the oil O stored and the pump  96  to communicate with each other. The second portion  91   b  allows the pump  96  and the cooler  97  to communicate with each other. 
     The intermediate channel portion  92  is provided across the wall portion of the gear housing  61  and a wall portion of the motor housing  20 . The intermediate channel portion  92  allows the gear-side channel portion  91  and the rotating electrical machine-side channel portion  93  to communicate with each other. More specifically, the intermediate channel portion  92  allows the cooler  97  and a third channel portion  93   c  described later to communicate with each other. 
     The rotating electrical machine-side channel portion  93  is provided in the rotating electrical machine  10 . The rotating electrical machine-side channel portion  93  includes a first channel portion  93   a , a second channel portion  93   b , and the third channel portion  93   c . That is, the rotating electrical machine  10  includes the first channel portion  93   a , the second channel portion  93   b , and the third channel portion  93   c . The first channel portion  93   a  and the third channel portion  93   c  are provided in the wall portion of the motor housing  20 . The second channel portion  93   b  includes a fourth channel portion  93   d  provided in a wall portion of the motor housing  20  and the refrigerant supply portion  95 . In the present embodiment, the first channel portion  93   a , the third channel portion  93   c , and the fourth channel portion  93   d  are provided in the motor cover  23 . The third channel portion  93   c  communicates with the first channel portion  93   a  and the second channel portion  93   b . In the present embodiment, the first channel portion  93   a  and the second channel portion  93   b  branch from the third channel portion  93   c.    
     The first channel portion  93   a  is a channel portion through which the oil O as a fluid to is supplied to inside the peripheral wall portion  23   b . The first channel portion  93   a  has an end portion on the upstream side that communicates with an end portion of the third channel portion  93   c  on the downstream side. The first channel portion  93   a  has an end portion on the downstream side that opens to the inside of the peripheral wall portion  23   b . As illustrated in  FIG.  2   , an end portion on the downstream side of the first channel portion  93   a  is open to the surface on the second axial side (+Y side) of the bottom wall portion  23   a . In the present embodiment, the end portion on the downstream side of the first channel portion  93   a  is open inside the second recess portion  23   g . The end portion on the downstream side of the first channel portion  93   a  is a supply port  93   e  for supplying the oil O into the peripheral wall portion  23   b.    
     The first channel portion  93   a  opens toward an axial gap  27  between the nozzle member  70  and the seal member  120  in the motor housing  20 . In the present embodiment, the axial gap  27  is a portion positioned on the first axial side (−Y side) relative to the nozzle member  70  and positioned on the second axial side (+Y side) relative to the seal member  120  in the internal space of the peripheral wall portion  23   b . The axial gap  27  includes a space on the radially inside of the first wall portion  23   c  and an internal space of the second recess portion  23   g . In the present embodiment, the first channel portion  93   a  corresponds to the “housing channel portion” provided in the motor housing  20 . 
     As illustrated in  FIG.  1   , the second channel portion  93   b  is a channel portion through which the oil O as a fluid is supplied to the stator  40 . An end portion on the upstream side of the fourth channel portion  93   d  in the second channel portion  93   b  communicates with an end portion on the downstream side of the third channel portion  93   c . An end portion on the downstream side of the fourth channel portion  93   d  communicates with an end portion on the upstream side of the refrigerant supply portion  95 . 
     In the present embodiment, the refrigerant supply portion  95  is in a tubular shape extending axially. In other words, in the present embodiment, the refrigerant supply portion  95  is an axially extending pipe. The refrigerant supply portion  95  has axially both end portions supported by the motor housing  20 . The refrigerant supply portion  95  has the end portion on the second axial side (+Y side) that is supported by the partition wall portion  22 , for example. The refrigerant supply portion  95  has the end portion on the first axial side (−Y side) that is supported by the motor cover  23 , for example. 
     The refrigerant supply portion  95  is positioned radially outside the stator  40 . In the present embodiment, the refrigerant supply portion  95  is positioned on the upper side of the stator  40 . In the present embodiment, an orientation in which the oil O in the refrigerant supply portion  95  flows is an orientation of flowing from the first axial side to the second axial side. That is, in the flow direction of the oil O in the refrigerant supply portion  95 , the first axial side is an upstream side and the second axial side is a downstream side. The refrigerant supply portion  95  has a supply port  95   a  for supplying the oil O as a refrigerant to the stator  40 . In the present embodiment, the supply port  95   a  is an injection port through which the oil O having flowed into the refrigerant supply portion  95  is injected partially to the outside of the refrigerant supply portion  95 . A plurality of supply ports  95   a  are provided. 
     When the pump  96  is driven, the oil O stored in the gear housing  61  is sucked up through the first portion  91   a  and flows into the cooler  97  through the second portion  91   b . The oil O having flowed into the cooler  97  is cooled in the cooler  97 , and then flows from the third channel portion  93   c  into the rotating electrical machine-side channel portion  93  through the intermediate channel portion  92 . The oil O having flowed into the third channel portion  93   c  branches into the first channel portion  93   a  and the second channel portion  93   b . As illustrated in  FIG.  2   , the oil O having flowed into the first channel portion  93   a  flows into the peripheral wall portion  23   b . In the present embodiment, the oil O from the first channel portion  93   a  flows into the second recess portion  23   g  provided in the bottom wall portion  23   a . The oil O from the first channel portion  93   a  flows into the axial gap  27 . 
     A part of the oil O having flowed into the axial gap  27  flows into the first recess portion  113  through the nozzle through hole  70   a . More specifically, a part of the oil O having flowed into the axial gap  27  flows into the first recess portion  113  through the guide tube portion  71   b  and the discharge tube portion  71   a  in this order. The other part of the oil O having flowed into the axial gap  27  from the first channel portion  93   a  flows to the second axial side (+Y side) relative to the flange portion  72  through the penetration portion  74 . The oil O that having flowed to the second axial side relative to the flange portion  72  through the penetration portion  74  flows along, for example, the surface on the second axial side of the flange portion  72  and the inner peripheral surface of the protruding tube portion  73 , and is supplied to the bearing  35 . The amount of the oil O passing through the penetration portion  74  is smaller than the amount of the oil O passing through the nozzle through hole  70   a.    
     A part of the oil O having flowed inside the first recess portion  113  flows inside the first shaft portion  31   a  through the plurality of connection channel portions  115 . A part of the oil O having flowed into the first shaft portion  31   a  flows to the second axial side (+Y side) inside the first shaft portion  31   a . As illustrated in  FIG.  1   , the oil O having flowed into the shaft  31  from the nozzle member  70  and flowing to the second axial side through inside the first shaft portion  31   a  passes through the inside of the rotor body  32  from the hole portion  33  and scatters to the stator  40 . 
     As illustrated in  FIG.  2   , another part of the oil O having flowed inside the first recess portion  113  is discharged from the first recess portion  113  to the first axial side (−Y side) via a portion positioned on the radial outside relative to the discharge tube portion  71   a  of the inside of the first recess portion  113 . The oil O discharged from the first recess portion  113  to the first axial side flows, for example, along the outer peripheral surface of the supply tube portion  71 , the surface on the second axial side (+Y side) of the flange portion  72 , and the inner peripheral surface of the protruding tube portion  73 , and is supplied to the bearing  35 . The amount of the oil O discharged from the first recess portion  113  to the first axial side is smaller than the amount of the oil O discharged into the first shaft portion  31   a  through the connection channel portion  115 . 
     As illustrated in  FIG.  1   , the oil O having flowed into the second channel portion  93   b  flows inside the refrigerant supply portion  95  through the fourth channel portion  93   d . The oil O having flowed into the refrigerant supply portion  95  is injected from the supply port  95   a  and supplied to the stator  40 . Thus, by providing the first channel portion  93   a  and the second channel portion  93   b , which branch from the third channel portion  93   c , it is possible to suitably and easily supply the oil O sent from the inside of the gear housing  61  into the shaft  31  through the inside of the peripheral wall portion  23   b  and to the stator  40  from the refrigerant supply portion  95 . 
     In the present embodiment, the oil O scraped up by the ring gear  63   a  partially enters a reservoir  98  provided in the gear housing  61 . The oil O having entered the reservoir  98  flows into the shaft  31  from an end portion on the second axial side (+Y side). The oil O having flowed into the shaft  31  from the reservoir  98  passes through the inside of the rotor body  32  from the hole portion  33  and scatters to the stator  40 . 
     The oil O supplied to the stator  40  from the supply port  95   a  and the oil O supplied to the stator  40  from the inside of the shaft  31  take heat from the stator  40 . The oil O having cooled the stator  40  falls to the lower side to accumulate in a lower region in the motor housing  20 . The oil O accumulated in the lower region in the motor housing  20  returns to the inside of the gear housing  61  through the partition wall opening  22   a  provided in the partition wall portion  22 . As described above, the refrigerant channel portion  90  allows the oil O stored in the gear housing  61  to be supplied to the rotor  30  and the stator  40 . 
     According to the present embodiment, the electricity removal device  80  is in contact with the portion of the extension portion  112  positioned on the first axial side (−Y side) relative to the nozzle through hole  70   a . The seal member  120  is positioned on the first axial side relative to the nozzle member  70  and on the second axial side (+Y side) relative to the electricity removal device  80 . Therefore, the seal member  120  can seal radially between the portion of the extension portion  112  positioned axially between the nozzle member  70  and the electricity removal device  80  and the motor housing  20 . Due to this, the seal member  120  can suppress the oil O flowing through the nozzle member  70  from flowing to the electricity removal device  80 . Therefore, it is possible to suppress the conductivity of the electricity removal device  80  from decreasing due to the oil O. Therefore, it is possible to suppress the current generated in the shaft  31  from becoming hard to flow to the motor housing  20  via the electricity removal device  80 . That is, it is possible to suppress the electricity removal performance of the electricity removal device  80  from deteriorating. Therefore, for example, the electricity removal device  80  does not need to be an electricity removal device excellent in oil resistance, and the electricity removal device  80  can be easily made a relatively inexpensive electricity removal device. 
     In the present embodiment, the electricity removal device  80  includes a carbon brush as the brush portion  82  in electrical contact with the extension portion  112 . The electricity removal device  80  having such a carbon brush is less expensive than an electricity removal device having an annular brush portion configured of a plurality of conductive fibers, for example. Therefore, the cost of the electricity removal device  80  can be reduced, and the manufacturing cost of the rotating electrical machine  10  can be reduced. 
     When the carbon brush is brought into contact with a portion of the shaft  31  having a relatively large outer diameter, a circumferential dimension of a portion of the outer peripheral surface of the shaft  31  against which the carbon brush is rubbed becomes relatively large. Therefore, the carbon brush is easily worn. On the other hand, in the present embodiment, the brush portion  82  is in contact with the extension portion  112 . Unlike the first shaft portion  31   a , the extension portion  112  does not need to flow the oil O internally, and therefore the outer diameter of the extension portion  112  can be made smaller than the outer diameter of the first shaft portion  31   a . Due to this, the brush portion  82  can be brought into contact with a portion of the shaft  31  having a relatively small outer diameter. Accordingly, even when the brush portion  82  is a relatively inexpensive carbon brush, wearing of the brush portion  82  can be suppressed. 
     According to the present embodiment, the shaft  31  has the connection channel portion  115  communicating with the inside of the first shaft portion  31   a  and the inside of the nozzle through hole  70   a . The first channel portion  93   a  as a housing channel portion provided in the motor housing  20  opens toward the axial gap  27  between the nozzle member  70  and the seal member  120  of the inside of the motor housing  20 . Therefore, as in the present embodiment for example, the oil O supplied from the first channel portion  93   a  to the axial gap  27  can be supplied to the inside of the first shaft portion  31   a  via the nozzle through hole  70   a  and the connection channel portion  115 . Due to this, the oil O can be suitably supplied to the inside of the shaft  31 . 
     The electricity removal device  80  may be the electricity removal device  80  having excellent oil resistance, or may be an electricity removal device having relatively poor oil resistance. “The electricity removal device  80  has excellent oil resistance” means that a change caused by the electricity removal device  80  coming into contact with the oil O hardly occurs in the electricity removal device  80 . The oil resistance may be evaluated by an immersion test into the oil O. In this case, the oil resistance is evaluated by change in weight and change in strength after immersion for a predetermined time. The evaluation of change in weight includes viewpoints of, for example, corrosion and swelling. 
     According to the present embodiment, the nozzle member  70  has the penetration portion  74  that axially penetrates the portion of the nozzle member  70  axially opposing the bearing  35 . Therefore, a part of the oil O in the axial gap  27  can be supplied to the bearing  35  as lubricating oil via the penetration portion  74 . Due to this, the oil O can be suitably supplied to the bearing  35 . 
     Here, in the present embodiment, the bearing  35  is a ceramic ball bearing. Ceramic ball bearings often have a structure in which grease cannot be enclosed inside. Therefore, when the bearing  35  is a ceramic ball bearing as in the present embodiment, it is particularly important that the oil O can be supplied as lubricating oil from the outside of the bearing  35 . When the bearing  35  is a ceramic ball bearing, it is possible to suppress the current generated in the shaft  31  from flowing to the bearing  35 . Therefore, it is possible to suppress generation of a circulating current circulating through the shaft  31 , the bearing  35 , and the motor housing  20 . 
     According to the present embodiment, the channel cross-sectional area of the connection channel portion  115  increases toward the inside of the first shaft portion  31   a . Therefore, the oil O having flowed into the connection channel portion  115  from the nozzle member  70  can be easily discharged inside the first shaft portion  31   a . Due to this, the oil O can be more easily supplied inside the shaft  31 . In the present embodiment, the connection channel portion  115  is positioned radially outside the central axis J, and the inner peripheral surface of the connection channel portion  115  has a cylindrical shape whose inner diameter increases toward the inside of the first shaft portion  31   a . Therefore, a portion of the inner peripheral surface of the connection channel portion  115  positioned radially outside is positioned radially outside toward the inside of the first shaft portion  31   a  in the axial direction. Due to this, when the oil O is pressed against a portion positioned on the radially outside of the inner peripheral surface of the connection channel portion  115  by the centrifugal force generated by the rotation of the shaft  31 , the pressed oil O easily flows in an orientation approaching the inside of the first shaft portion  31   a  along the inner peripheral surface of the connection channel portion  115 . Therefore, the oil O having flowed into the connection channel portion  115  can be more suitably discharged into the first shaft portion  31   a.    
     According to the present embodiment, the lid portion  111  has the first recess portion  113  that is recessed from the surface on the first axial side (−Y side) of the lid portion  111  to the second axial side (+Y side). The end portion on the second axial side of the supply tube portion  71  constituting the nozzle through hole  70   a  is positioned in the first recess portion  113 . The connection channel portion  115  is open to the inside of the first recess portion  113  and communicates with the inside of the nozzle through hole  70   a  via the inside of the first recess portion  113 . Therefore, the oil O can be supplied from the supply tube portion  71  into the first recess portion  113 , and the oil O can flow from the first recess portion  113  into the connection channel portion  115 . Due to this, the oil O flowing in the nozzle through hole  70   a  can suitably flow to the connection channel portion  115 . Therefore, the oil O can be more suitably supplied inside the shaft  31 . 
     According to the present embodiment, the connection channel portion  115  is open across a bottom surface  113   a  positioned on the second axial side (+Y side) of the inner surface of the first recess portion  113  and an inner peripheral surface  113   b  positioned on the radially outside of the inner surface of the first recess portion  113 . Therefore, as compared with a case where, for example, the connection channel portion  115  is open only on the bottom surface  113   a , the oil O having flowed into the first recess portion  113  from the nozzle through hole  70   a  can be easily caused to flow into the connection channel portion  115 . In particular, since the oil O having flowed into the first recess portion  113  receives a force radially outward by the centrifugal force, the oil O flowing radially outward by the centrifugal force in the first recess portion  113  easily flows into the connection channel portion  115  from the portion of the connection channel portion  115  open to the inner peripheral surface  113   b.    
     According to the present embodiment, the extension portion  112  extends to the first axial side (−Y side) from the bottom surface  113   a  positioned on the second axial side (+Y side) of the inner surface of the first recess portion  113 . A plurality of the connection channel portions  115  are provided to surround the extension portion  112  when viewed axially. Therefore, it is possible to easily pass the extension portion  112  through the nozzle through hole  70   a  while arranging the axial end portion of the supply tube portion  71  into the first recess portion  113  by providing the first recess portion  113 . The oil O can be more suitably supplied into the first shaft portion  31   a  by the plurality of connection channel portions  115 . 
     According to the present embodiment, the nozzle member  70  includes the flange portion  72  that extends radially outward from the supply tube portion  71  and is disposed to oppose the first axial side (−Y side) of the bearing  35 , and the protruding tube portion  73  that protrudes from the radially outer edge portion of the flange portion  72  to the second axial side (+Y side). Therefore, the flange portion  72  can suppress the oil O having flowed into the axial gap  27  from flowing excessively to the bearing  35 . Due to this, the oil O having flowed into the axial gap  27  can be easily supplied into the shaft  31  via the supply tube portion  71 . As described above, the oil O flowing out from the inside of the first recess portion  113  to the first axial side can be suitably guided to the bearing  35  along the supply tube portion  71 , the flange portion  72 , and the protruding tube portion  73 . 
     According to the present embodiment, the lid portion  111  overlaps the bearing  35  in the radial direction. Therefore, the connection channel portion  115  provided in the lid portion  111  can be disposed at a position close to the bearing  35 . Due to this, the oil O leaking without flowing into the connection channel portion  115  of the oil O supplied from the nozzle member  70  can be easily supplied to the bearing  35 . Specifically, in the present embodiment, the oil O leaking through the opening portion on the first axial side (−Y side) of the first recess portion  113  can be easily supplied to the bearing  35 . 
     According to the present embodiment, the axial position at the end portion on the first axial side (−Y side) of the lid portion  111  is the same as the axial position at the end portion on the first axial side of the bearing  35 . Therefore, the connection channel portion  115  provided in the lid portion  111  can be disposed at a position closer to the bearing  35 . Due to this, the oil O leaking without flowing into the connection channel portion  115  of the oil O supplied from the nozzle member  70  can be more easily supplied to the bearing  35 . 
     The present invention is not limited to the above-described embodiments, and other configurations and other methods can be employed within the scope of the technical idea of the present invention. The first shaft portion and the second shaft portion need not be separated from each other. The first shaft portion and the second shaft portion may be a part of an identical single member. When the first shaft portion is configured by axially coupling the motor shaft positioned in the motor housing and the gear shaft positioned in the gear housing, the motor shaft and the second shaft portion may be a part of an identical single member. The lid portion of the second shaft portion needs not have the recess portion into which the supply tube portion of the nozzle member is inserted. The relative positional relationship between the lid portion and the bearing is not particularly limited. 
     The connection channel portion provided in the shaft may have any configuration as long as the connection channel portion communicates with the inside of the first shaft portion and the inside of the nozzle through hole. The connection channel portion may be provided across the lid portion and the extension portion in the second shaft portion, may be provided across the first shaft portion and the second shaft portion, or may be provided only in the first shaft portion. The connection channel portion may have any shape. The channel cross-sectional area of the connection channel portion may be uniform over the entire connection channel portion. The connection channel portion may directly communicate with the inside of the first shaft portion and the inside of the nozzle through hole. The number of the connection channel portions is not particularly limited as long as it is one or more. 
     The electricity removal device may be any type of electricity removal device as long as it is in electrical contact with a shaft and a housing of a rotating electrical machine to allow a current flowing through the shaft to release to the housing. The electricity removal device may be an electricity removal device having an annular brush portion configured of a plurality of conductive fibers. 
     The nozzle member may have any shape as long as the nozzle member has the nozzle through hole. The penetration portion axially penetrating a portion of the nozzle member opposing the bearing in the axial direction may have any shape, or may be a notch instead of a hole. The number of the penetration portions is not particularly limited. The penetration portion needs not be provided. 
     The housing channel portion provided in the housing of the rotating electrical machine may be any channel portion as long as the housing channel portion opens toward the axial gap between the nozzle member and the seal member of the inside of the housing. The housing channel portion needs not be a channel portion that supplies a fluid into the axial gap between the nozzle member and the seal member of the inside of the housing. For example, the fluid may flow from the inside of the shaft to the axial gap via the connection channel portion and the nozzle through hole, and flow from the axial gap into the housing channel portion. 
     The fluid flowing through the housing channel portion and the fluid flowing through the nozzle member may be any type of fluid. The fluid may be an insulating liquid or may be water. When the fluid is water, the surface of the stator may be subjected to an insulation treatment. The bearing supplied with the fluid via the nozzle member may be any type of bearing. 
     The seal member positioned radially between the shaft and the housing may have any configuration as long as the seal member is positioned on the first axial side relative to the nozzle member and on the second axial side relative to the electricity removal device. The seal member may be any type of seal member as long as it can seal radially between the shaft and the housing. 
     The rotating electrical machine applied with the present invention is not limited to a motor, and may be a generator. The use of the rotating electrical machine is not particularly limited. For example, the rotating electrical machine may be equipped on the vehicle for uses other than the use of rotating the axle, or may be equipped on equipment other than a vehicle. The attitude of the rotating electrical machine when used is not particularly limited. The central axis of the rotating electrical machine may extend in the vertical direction. The configurations and methods described above in the present description can be appropriately combined within a range consistent with each other. 
     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.