Patent Publication Number: US-2023137134-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. 2021-177840 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 nozzle member that supplies a fluid to an inside of the shaft; and a cover member that covers at least a part of the electricity removal device. The shaft includes a hollow first shaft member, a hollow second shaft member that is a separate body from the first shaft member and is coupled to a first axial side of the first shaft member, and a connection channel portion that allows an inside of the shaft and an outside of the shaft to communicate each other. The second shaft member has an opening end portion that opens on a first axial side. At least a part of the nozzle member is inserted into the second shaft member from the opening end portion. The housing has a peripheral wall portion surrounding the opening end portion. The bearing is held in the peripheral wall portion and is positioned away on the second axial side of the electricity removal device. The cover member is positioned axially between the bearing and the electricity removal device. The connection channel portion is open in a portion positioned on a second axial side relative to the cover member inside the peripheral wall portion. 
     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 a first embodiment; 
         FIG.  2    is a cross-sectional view illustrating a part of a rotating electrical machine of the first embodiment; 
         FIG.  3    is an exploded perspective view illustrating a second shaft member, a cover member, an electricity removal device, and a nozzle member of the first embodiment; 
         FIG.  4    is an exploded perspective view illustrating the second shaft member, the cover member, the electricity removal device, and the nozzle member of the first embodiment, and is a view of each member viewed from an angle different from that in  FIG.  3   ; 
         FIG.  5    is a cross-sectional view illustrating a flow of oil supplied from the nozzle member to an inside of the shaft in the first embodiment; 
         FIG.  6    is a cross-sectional view illustrating a part of a rotating electrical machine of a second embodiment; 
       and 
         FIG.  7    is a cross-sectional view illustrating a part of a rotating electrical machine of a third embodiment. 
     
    
    
     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 cover 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 lid portion  23 . The body portion  21  and the partition wall portion  22  are each, for example, a part of an identical single member. The lid portion  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 lid portion  23  is fixed to an end portion of the body portion  21  on the first axial side. The lid portion  23  closes an opening of the body portion  21  on the first axial side. The lid portion  23  holds the bearing  35 . 
     As illustrated in  FIG.  2   , the lid portion  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 lid portion  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 lid portion  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 . The bottom wall portion  23   a  is positioned on the first axial side (−Y side) of an opening end portion  110   a  of the shaft  31 . A surface of the bottom wall portion  23   a  on the second axial side (+Y side) is provided with a recess portion  23   g  recessed on the first axial side. When viewed axially, the inner edge of the 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 opening end portion  110   a  of 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 lid portion  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 lid portion  23  on the second axial side. The resolver holding portion  25  extends in the circumferential direction and surrounds the shaft  31 . 
     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 . 
     As illustrated in  FIG.  2   , the shaft  31  includes a hollow first shaft member  31   a  and a hollow second shaft member  110 . The first shaft member  31   a  has a cylindrical shape extending axially about the central axis J. The first shaft member  31   a  is open on both axial sides. As illustrated in  FIG.  1   , the first shaft member  31   a  extends across the inside of the motor housing  20  and the inside of the gear housing  61 . The first shaft member  31   a  is rotatably supported by the bearings  34  and  35 . For example, the first shaft member  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 member  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 member  31   a . A stepped portion having a stepped surface facing the first axial side (−Y 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 of the inner ring  35   a  of the bearing  35 . 
     A fourth inclined surface  31   d  is provided on the inner peripheral surface of the first shaft member  31   a . The fourth inclined surface  31   d  is positioned radially inward toward the second axial side (+Y side). In the present embodiment, the fourth inclined surface  31   d  has an annular shape about the central axis J. The fourth inclined surface  31   d  is a tapered surface whose inner diameter decreases toward the second axial side. The fourth inclined surface  31   d  is provided on the inner peripheral surface of the small-diameter portion  31   c . More specifically, the fourth inclined surface  31   d  is provided on the small-diameter portion  31   c  on the inner peripheral surface of a portion of positioned on the second axial side relative to the portion supported by the bearing  35 . An inner diameter of a portion of the first shaft member  31   a  positioned on the first axial side (−Y side) relative to the fourth inclined surface  31   d  is larger than an inner diameter of a portion of the first shaft member  31   a  positioned on the second axial side relative to the fourth inclined surface  31   d.    
     The second shaft member  110  is a separate body from the first shaft member  31   a . The second shaft member  110  is coupled to the first axial side (−Y side) of the first shaft member  31   a . As illustrated in  FIGS.  3  and  4   , the second shaft member  110  has a cylindrical shape extending axially about the central axis J. The second shaft member  110  is open on both axial sides. The end portion on the first axial side of the second shaft member  110  is an end portion on the first axial side of the shaft  31 . 
     As illustrated in  FIG.  2   , the second shaft member  110  is positioned inside the motor housing  20 . The second shaft member  110  is positioned radially inside the peripheral wall portion  23   b . The axial dimension of the second shaft member  110  is smaller than the axial dimension of the first shaft member  31   a . The second shaft member  110  has an opening end portion  110   a  that opens on the first axial side (−Y side). The opening end portion  110   a  is an end portion on the first axial side of the second shaft member  110 . The opening end portion  110   a  is positioned radially inside the peripheral wall portion  23   b . In the present embodiment, the opening end portion  110   a  is positioned radially inside the second wall portion  23   d . The opening end portion  110   a  is disposed away from the bottom wall portion  23   a  on the second axial side (+Y side). The second shaft member  110  includes a fit tube portion  111 , a flange portion  112 , and a contacted tube portion  113 . 
     The fit tube portion  111  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 fit tube portion  111  is an end portion on the second axial side of the second shaft member  110 . The fit tube portion  111  is fitted inside the first shaft member  31   a . More specifically, the fit tube portion  111  is press-fitted into the end portion on the first axial side (−Y side) of the small-diameter portion  31   c . Due to this, the second shaft member  110  is fixed to the first shaft member  31   a . The end portion on the second axial side of the fit tube portion  111  is positioned on the second axial side relative to the end portion on the first axial side of the bearing  35 , and is positioned on the first axial side relative to the end portion on the second axial side of the bearing  35 . 
     An inner peripheral surface  111   a  of the fit tube portion  111  has a cylindrical surface  111   b  and a first inclined surface  111   c . That is, the inner peripheral surface of the second shaft member  110  has the cylindrical surface  111   b  and the first inclined surface  111   c . The cylindrical surface  111   b  is a portion on the first axial side (−Y side) of the inner peripheral surface  111   a . The end portion on the first axial side of the cylindrical surface  111   b  is an end portion on the first axial side of the inner peripheral surface  111   a . The cylindrical surface  111   b  is a surface in a cylindrical shape having a uniform inner diameter over the entire axial direction about the central axis J. 
     The first inclined surface  111   c  is a portion on the second axial side (+Y side) of the inner peripheral surface  111   a . The first inclined surface  111   c  communicates with the second axial side of the cylindrical surface  111   b . The end portion on the second axial side of the first inclined surface  111   c  is an end portion on the second axial side of the inner peripheral surface  111   a . The first inclined surface  111   c  is positioned radially outward toward the second axial side. The first inclined surface  111   c  is a cylindrical surface whose inner diameter increases toward the second axial side about the central axis J. The shape of the first inclined surface  111   c  is similar to the outer peripheral surface of a truncated cone whose outer diameter increases toward the second axial side. 
     The outer peripheral surface at an end portion on the second axial side (+Y side) of the fit tube portion  111  is a fifth inclined surface  111   d . The fifth inclined surface  111   d  is positioned radially inward toward the second axial side. The fifth inclined surface  111   d  is a cylindrical surface whose outer diameter decreases toward the second axial side about the central axis J. The shape of the fifth inclined surface  111   d  is similar to the outer peripheral surface of a truncated cone whose outer diameter decreases toward the second axial side. Since the fifth inclined surface  111   d  is provided, the outer diameter at the end portion on the second axial side of the fit tube portion  111  decreases toward the second axial side. 
     As illustrated in  FIG.  3   , the flange portion  112  protrudes radially outward from the fit tube portion  111 . In the present embodiment, the flange portion  112  protrudes radially outward from an end portion on the first axial side (−Y side) of the fit tube portion  111 . The flange portion  112  has an annular shape about the central axis J. As illustrated in  FIG.  2   , the flange portion  112  is disposed to oppose first axial side of the first shaft member  31   a . In the present embodiment, the flange portion  112  is in contact with the end portion on the first axial side of the first shaft member  31   a . Due to this, the second shaft member  110  is positioned axially with respect to the first shaft member  31   a . An end portion on the radially outside of the flange portion  112  is positioned slightly radially inside relative to the outer peripheral surface of the end portion on the first axial side of the first shaft member  31   a.    
     The radially outer portion of the flange portion  112  is a first opposing portion  112   a  disposed to oppose the cover member  120  with a gap in the axial direction. That is, the second shaft member  110  has the first opposing portion  112   a . In the present embodiment, the flange portion  112  has the first opposing portion  112   a . The first opposing portion  112   a  is a portion of the flange portion  112  that protrudes on the radially outside relative to the contacted tube portion  113 . In the present embodiment, the first opposing portion  112   a  is positioned on the second axial side (+Y side) of the cover member  120 . 
     As illustrated in  FIG.  4   , the contacted tube portion  113  has a cylindrical shape that opens on the first axial side (−Y side) about the central axis J. The end portion on the first axial side of the contacted tube portion  113  is an end portion on the first axial side of the second shaft member  110  and is the opening end portion  110   a . The contacted tube portion  113  extends on the first axial side from the flange portion  112 . The outer peripheral surface of the contacted tube portion  113  is positioned radially inside relative to the end portion on the radially outside of the flange portion  112 . As illustrated in  FIG.  2   , the inside of the contacted tube portion  113  communicates with the first axial side of the inside of the fit tube portion  111 . The outer diameter of the contacted tube portion  113  is larger than the outer diameter of the fit tube portion  111 . The inner diameter of the contacted tube portion  113  is larger than the inner diameter of the fit tube portion  111 . A brush portion  82  described later of the electricity removal device  80  is in contact with the outer peripheral surface of the contacted tube portion  113 . 
     As illustrated in  FIG.  3   , the second shaft member  110  has a groove  114 . A plurality of grooves  114  are provided at intervals in the circumferential direction. The plurality of grooves  114  are arranged at equal intervals over the entire circumference along the circumferential direction. In the present embodiment, four of the grooves  114  are provided. Each of the grooves  114  has a first groove  114   a  and a second groove  114   b.    
     The first groove  114   a  is provided on the outer peripheral surface of the fit tube portion  111 . The first groove  114   a  is recessed radially inward from the outer peripheral surface of the fit tube portion  111 . The first groove  114   a  extends in the axial direction. The first groove  114   a  extends from the end portion on the second axial side (+Y side) of the fit tube portion  111  to a portion of the outer peripheral surface of the fit tube portion  111  where the flange portion  112  is communicated. The first groove  114   a  is open on the second axial side. In a cross section orthogonal to the axial direction in which the first groove  114   a  extends, the shape of the inside of the first groove  114   a  is, for example, a rectangular shape. 
     The second groove  114   b  is provided on a surface on the second axial side (+Y side) of the flange portion  112 . The second groove  114   b  is recessed from the surface on the second axial side of the flange portion  112  to the first axial side (−Y side). The second groove  114   b  extends radially outward from an end portion on the first axial side of the first groove  114   a . The second groove  114   b  extends from the end portion of the radially inside of the flange portion  112  to the end portion on the radially outside of the flange portion  112 . The second groove  114   b  is open radially outward. In the cross section orthogonal to the radial direction in which the second groove  114   b  extends, the shape of the inside of the second groove  114   b  is, for example, a semicircular shape protruding to the first axial side. 
     As illustrated in  FIG.  2   , the shaft  31  includes a connection channel portion  115  that allows the inside of the shaft  31  and the outside of the shaft  31  to communicate with each other. In the present embodiment, at least a part of the connection channel portion  115  is provided in the second shaft member  110 . The connection channel portion  115  is provided between the first shaft member  31   a  and the second shaft member  110 . In the present embodiment, the connection channel portion  115  is formed by closing the opening portion on the radially outside of the first groove  114   a  by the inner peripheral surface of the first shaft member  31   a , and closing the opening portion on the second axial side (+Y side) of the second groove  114   b  by the end surface on the first axial side (−Y side) of the first shaft member  31   a . The inside of the connection channel portion  115  includes the inside of the first groove  114   a  and the inside of the second groove  114   b.    
     The connection channel portion  115  has a first opening portion  115   a  that opens on the second axial side through an opening portion on the second axial side (+Y side) of the first groove  114   a . The first opening portion  115   a  is open to the inside of the shaft  31 . In the present embodiment, the first opening portion  115   a  is open to the inside of the first shaft member  31   a  of the inside of the shaft  31 . The connection channel portion  115  has a second opening portion  115   b  that opens radially outward through an opening portion on the radially outside of the second groove  114   b . The second opening portion  115   b  is open to the outside of the shaft  31 . The second opening portion  115   b  is open in a portion positioned on the second axial side relative to the cover member  120  of the inside of the peripheral wall portion  23   b . In the present embodiment, the second opening portion  115   b  is open in a portion of an inside of the peripheral wall portion  23   b  positioned axially between the bearing  35  and the cover member  120 . More specifically, the second opening portion  115   b  is open in a portion of an inside of the peripheral wall portion  23   b  positioned axially between the inner ring  35   a  of the bearing  35  and the radially inner portion of the cover member  120 . The second opening portion  115   b  is open toward a guide wall portion  123  described later. 
     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 positioned radially inside the peripheral wall portion  23   b . The electricity removal device  80  is in an annular shape surrounding the shaft  31 . In the present embodiment, the electricity removal device  80  has an annular shape about the central axis J. The electricity removal device  80  surrounds the second shaft member  110 . More specifically, the electricity removal device  80  surrounds the end portion on the first axial side (−Y side) of the contacted tube portion  113 , that is, the opening end portion  110   a . In the present embodiment, the electricity removal device  80  is fitted to the radially inner side of the second wall portion  23   d.    
     The electricity removal device  80  is positioned on the first axial side (−Y side) of the bearing  35 . Due to this, the bearing  35  is positioned axially between the resolver rotor  51  and the electricity removal device  80 . The electricity removal device  80  and the bearing  35  are spaced apart from each other in the axial direction. That is, the bearing  35  is positioned away from the second axial side (+Y side) of the electricity removal device  80 . As illustrated in  FIGS.  3  and  4   , the electricity removal device  80  includes a base portion  81  in an annular shape about the central axis J, and the brush portion  82  provided over the entire circumference of a radially inner edge portion of the base portion  81 . 
     As illustrated in  FIG.  2   , the base portion  81  is fitted to the radially inner side of the second wall portion  23   d . The base portion  81  is fixed to the second wall portion  23   d  with an adhesive, for example. Due to this, the electricity removal device  80  is fixed to the motor housing  20 . A method for fixing the electricity removal device  80  to the motor housing  20  is not particularly limited. The electricity removal device  80  may be fixed to the motor housing  20  by press fitting, for example. 
     A surface of the base portion  81  on the first axial side (−Y side) in a radially outer edge portion is in contact with the first stepped surface  24   c . Due to this, the electricity removal device  80  is in contact with the first stepped surface  24   c . Thus, the electricity removal device  80  can be suitably positioned axially with respect to the motor housing  20 . The base portion  81  is in electrical contact with the peripheral wall portion  23   b . Due to this, the electricity removal device  80  is in electrical contact with the motor housing  20 . 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 brush portion  82  is in an annular shape surrounding the shaft  31 . More specifically, the brush portion  82  has an annular shape about the central axis J and surrounding the contacted tube portion  113 . In the present embodiment, the brush portion  82  is composed of a plurality of conductive fibers protruding radially inward from the radially inner edge portion of the base portion  81 . The fibers constituting the brush portion  82  are, for example, microfibers. The brush portion  82  is electrically connected to the base portion  81 . The radially inner edge portion of the brush portion  82  is in electrical contact with the outer peripheral surface of the contacted tube portion  113 . Due to this, the electricity removal device  80  is in electrical contact with the shaft  31 . In the present embodiment, the shaft  31  rotates while the outer peripheral surface of the contacted tube portion  113  is rubbed against the radially inner edge portion of the brush portion  82 . 
     In this way, the shaft  31  and the motor housing  20  are electrically communicated with each other through the electricity removal device  80 . Therefore, it is possible to flow a current generated in the shaft  31  from the peripheral wall portion  23   b  to the motor housing  20  through the brush portion  82  and the base portion  81  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 . The nozzle member  70  is made by metallic molding, for example, injection molding or die casting. The nozzle member  70  is disposed inside the peripheral wall portion  23   b . The nozzle member  70  is disposed to oppose the second axial side (+Y side) of the bottom wall portion  23   a . At least a part of the nozzle member  70  is inserted into the second shaft member  110  from the opening end portion  110   a . In the present embodiment, a part of the nozzle member  70  is inserted into the second shaft member  110 . The nozzle member  70  includes a supply tube portion  71 , a guide tube portion  72 , a nozzle flange portion  73 , and an outer tube portion  75 . 
     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 the second axial side (+Y side). The supply tube portion  71  is open on the inside of the shaft  31 . In the present embodiment, the entire supply tube portion  71  is positioned inside the second shaft member  110 . More specifically, the entire supply tube portion  71  except for the end portion on the second axial side is positioned inside the contacted tube portion  113 . The end portion on the second axial side of the supply tube portion  71  is positioned inside the fit tube portion  111 . The end portion on the second axial side of the supply tube portion  71  is positioned on the first axial side (−Y side) relative to the connection channel portion  115 . The supply tube portion  71  is disposed radially inward away from the inner peripheral surface of the second shaft member  110 . 
     The guide tube portion  72  communicates with the first axial side (−Y side) of the supply tube portion  71 . The guide tube portion  72  has a cylindrical shape that opens on the first axial side about the central axis J. The inner diameter and the outer diameter of the guide tube portion  72  increase toward the first axial side. The guide tube portion  72  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  72  is the same as the outer diameter at the end portion on the first axial side of the supply tube portion  71 , and is smaller than the inner diameter of the second shaft member  110 . The inner diameter at the end portion on the second axial side of the guide tube portion  72  is the same as the inner diameter at the end portion on the first axial side of the supply tube portion  71 . The outer diameter at the end portion on the first axial side of the guide tube portion  72  is larger than the inner diameter of the second shaft member  110  at the opening end portion  110   a.    
     The portion on the second axial side (+Y side) of the guide tube portion  72  is positioned inside the contacted tube portion  113 . The portion on the first axial side (−Y side) of the guide tube portion  72  is positioned outside the second shaft member  110 . The guide tube portion  72  is disposed away on the second axial side of the bottom wall portion  23   a . The guide tube portion  72  opposes the recess portion  23   g  in the axial direction. In the present embodiment, an end portion on the first axial side (−Y side) of the guide tube portion  72  is positioned on the radial outside relative to the inner peripheral surface of the opening end portion  110   a  and is positioned on the radial inside relative to the outer peripheral surface of the opening end portion  110   a . The end portion on the first axial side of the guide tube portion  72  is disposed away from the opening end portion  110   a  on the first axial side. The axial dimension of the guide tube portion  72  is larger than the axial dimension of the supply tube portion  71 . 
     As illustrated in  FIGS.  3  and  4   , the nozzle flange portion  73  protrudes radially outward from the guide tube portion  72 . In the present embodiment, the nozzle flange portion  73  protrudes radially outward from the end portion on the first axial side (−Y side) of the guide tube portion  72 . The nozzle flange portion  73  has an annular shape surrounding the central axis J. In the present embodiment, the nozzle flange portion  73  has an annular shape about the central axis J. 
     As illustrated in  FIG.  2   , the nozzle flange portion  73  is positioned axially between the electricity removal device  80  and the bottom wall portion  23   a . Due to this, the electricity removal device  80  is positioned axially between the bearing  35  and the nozzle flange portion  73 . The nozzle flange portion  73  is disposed to oppose the second axial side (+Y side) of the bottom wall portion  23   a . The nozzle flange portion  73  is disposed to oppose first axial side (−Y side) of the electricity removal device  80 . The nozzle flange portion  73  has an annular portion  73   a  and a tubular portion  73   b.    
     The annular portion  73   a  is a portion of the nozzle flange portion  73  that protrudes radially outward from the guide tube portion  72 . The annular portion  73   a  has an annular shape about the central axis J. The annular portion  73   a  has a plate shape whose plate surface faces the axial direction. In the example of  FIG.  2   , the surface on the first axial side (−Y side) in a radially outer portion of the annular portion  73   a  is in contact with a radially outer edge portion of the surface on the second axial side (+Y side) of the bottom wall portion  23   a . The radially outer edge portion of the surface on the second axial side of the bottom wall portion  23   a  is a peripheral edge portion of the recess portion  23   g  of the surface on the second axial side of the bottom wall portion  23   a.    
     The tubular portion  73   b  protrudes from the radially outer edge portion of the annular portion  73   a  to the second axial side (+Y side). The tubular portion  73   b  has a cylindrical shape about the central axis J. The tubular portion  73   b  is fitted with a gap on the radially inner side of the first wall portion  23   c . Due to this, in the present embodiment, the nozzle flange portion  73  is fitted inside of the peripheral wall portion  23   b . Thus, the nozzle member  70  can be positioned radially with respect to the motor housing  20 . In the present embodiment, since the tubular portion  73   b  protruding in the axial direction from the radially outer edge portion of the annular portion  73   a  is provided, the nozzle member  70  can be more suitably positioned radially with respect to the motor housing  20  by fitting the tubular portion  73   b  inside of the peripheral wall portion  23   b.    
     The end portion on the second axial side (+Y side) of the tubular portion  73   b  is positioned on the first axial side (−Y side) relative to the opening end portion  110   a . The tubular portion  73   b  is disposed to oppose the electricity removal device  80  in the axial direction. In the example of  FIG.  2   , the end portion on the second axial side of the tubular portion  73   b  is disposed away from the base portion  81  on the first axial side. The nozzle member  70  is axially movable within a range where the tubular portion  73   b  is movable axially between the electricity removal device  80  and the bottom wall portion  23   a , for example. 
     As illustrated in  FIG.  3   , the outer tube portion  75  has a cylindrical shape that opens on the second axial side (+Y side) about the central axis J. The outer tube portion  75  extends from the guide tube portion  72  to the second axial side. An end portion on the first axial side (−Y side) of the outer tube portion  75  communicates with a central portion in the axial direction and the radial direction of the guide tube portion  72 . The end portion on the second axial side of the outer tube portion  75  is positioned on the second axial side relative to the end portion on the second axial side of the supply tube portion  71 . That is, the end portion on the second axial side of the supply tube portion  71  is positioned on the first axial side relative to the end portion on the second axial side of the outer tube portion  75 . The outer tube portion  75  is positioned away on the radially outside of the supply tube portion  71 . That is, the supply tube portion  71  is positioned away on the radially inside of the outer tube portion  75 . The outer tube portion  75  surrounds the supply tube portion  71 . 
     As illustrated in  FIG.  2   , the outer tube portion  75  is inserted into the second shaft member  110  from the opening end portion  110   a . The entire outer tube portion  75  except for the end portion on the first axial side (−Y side) is positioned inside the second shaft member  110 . The outer tube portion  75  is disposed radially inward away from the inner peripheral surface of the second shaft member  110 . A portion on the first axial side of the outer tube portion  75  is positioned on the radially inside of the contacted tube portion  113  except for the end portion on the first axial side. A portion on the second axial side (+Y side) of the outer tube portion  75  is positioned on the radially inside of the fit tube portion  111 . 
     The radial gap between the portion on the second axial side (+Y side) of the outer tube portion  75  and the fit tube portion  111  is smaller than the radial gap between the portion on the first axial side (−Y side) of the outer tube portion  75  and the contacted tube portion  113 . The radial gap between the outer tube portion  75  and the second shaft member  110  is smaller than the radial gap between the outer tube portion  75  and the supply tube portion  71 . The outer peripheral surface of the portion on the second axial side of the outer tube portion  75  is positioned away on the radially inside of the cylindrical surface  111   b  of the inner peripheral surface  111   a . The end portion on the second axial side of the outer tube portion  75  is positioned on the first axial side relative to the end portion on the second axial side of the second shaft member  110 . The end portion on the second axial side of the outer tube portion  75  is positioned on the first axial side relative to the first inclined surface  111   c.    
     The cover member  120  is a member that covers at least a part of the electricity removal device  80 . In the present embodiment, the cover member  120  covers substantially the entire electricity removal device  80  from the second axial side (+Y side). The cover member  120  is positioned inside the peripheral wall portion  23   b . More specifically, the cover member  120  is positioned radially inside the second wall portion  23   d . The cover member  120  is positioned axially between the bearing  35  and the electricity removal device  80 . The cover member  120  is in contact with the bearing  35  in the axial direction. The cover member  120  opposes the electricity removal device  80  in the axial direction with a gap interposed therebetween. Since the cover member  120  is positioned on the second axial side of the electricity removal device  80 , even if the fixing of the electricity removal device  80  with respect to the motor housing  20  is released, the electricity removal device  80  can be suppressed from moving to the second axial side. 
     As illustrated in  FIGS.  3  and  4   , the cover member  120  is an annular shaped member about the central axis J. The cover member  120  has a plate shape whose plate surface faces the axial direction. As illustrated in  FIG.  2   , the cover member  120  has an annular shape surrounding the shaft  31 . In the present embodiment, the cover member  120  surrounds the second shaft member  110 . The cover member  120  includes a body portion  121 , a third opposing portion  122 , and the guide wall portion  123 . 
     The body portion  121  has an annular shape about the central axis J and has a plate shape whose plate surface faces the axial direction. The body portion  121  is fitted to the radially inner side of the peripheral wall portion  23   b . More specifically, the body portion  121  is press-fitted radially inside of the second wall portion  23   d . Due to this, the cover member  120  is fixed to the motor housing  20 . The surface on the second axial side (+Y side) of the body portion  121  has a first surface  121   a  and a second surface  121   b . As illustrated in  FIG.  3   , the first surface  121   a  and the second surface  121   b  are annular shaped surfaces facing the second axial side about the central axis J. In the present embodiment, the first surface  121   a  and the second surface  121   b  are orthogonal to the axial direction. 
     The first surface  121   a  is a radially inner portion of the surface on the second axial side (+Y side) of the body portion  121 . The second surface  121   b  is a radially outer portion of the surface on the second axial side of the body portion  121 . The second surface  121   b  communicates with the radially outside of the first surface  121   a  via a step. The second surface  121   b  is positioned on the second axial side relative to the first surface  121   a . When viewed axially, the second surface  121   b  surrounds the first surface  121   a.    
     As illustrated in  FIG.  2   , the end portion of the radially inside of the body portion  121  is a second opposing portion  121   c  positioned radially outside the first opposing portion  112   a . That is, the cover member  120  has the second opposing portion  121   c . The second opposing portion  121   c  is disposed to oppose the first opposing portion  112   a  with a gap in the radial direction. In the present embodiment, the end portion on the second axial side (+Y side) of the second opposing portion  121   c  is positioned radially outside the first opposing portion  112   a , and is disposed to oppose the first opposing portion  112   a  with a gap in the radial direction. 
     As illustrated in  FIG.  4   , the third opposing portion  122  has an annular shape about the central axis J. The third opposing portion  122  communicates with a radially inner end portion of the body portion  121 . More specifically, as illustrated in  FIG.  2   , the third opposing portion  122  communicates with the surface on the first axial side (−Y side) at the radially inner end portion of the body portion  121 . The third opposing portion  122  protrudes on the first axial side and radially inward from the body portion  121 . The surface on the second axial side (+Y side) in the portion of the third opposing portion  122  protruding radially inward relative to the body portion  121  is positioned on the first axial side relative to the first surface  121   a.    
     The radially inner end portion of the third opposing portion  122  is the radially inner end portion of the cover member  120 . The radially inner end portion of the third opposing portion  122  is positioned radially outside the outer peripheral surface of the contacted tube portion  113 . The radially inner end portion of the third opposing portion  122  radially opposes the outer peripheral surface of the contacted tube portion  113  with a gap interposed therebetween. The third opposing portion  122  is positioned on the first axial side (−Y side) of the first opposing portion  112   a . The third opposing portion  122  is disposed to oppose the first opposing portion  112   a  with a gap interposed therebetween in the axial direction. 
     In the present embodiment, a labyrinth seal structure  130  is configured by the first opposing portion  112   a , the second opposing portion  121   c , the third opposing portion  122 , and a portion of the contacted tube portion  113  radially opposing the cover member  120 . The labyrinth seal structure  130  is provided between the second shaft member  110  and the cover member  120 . As illustrated in  FIG.  5   , a gap G between the second shaft member  110  and the cover member  120  in the labyrinth seal structure  130  is open on both axial sides. An opening on the first axial side (−Y side) in the gap G is positioned on the radial inside relative to an opening on the second axial side (+Y side) in the gap G. 
     The gap G includes a first gap portion G 1 , a second gap portion G 2 , and a third gap portion G 3 . The first gap portion G 1  has an opening on the second axial side (+Y side) in the gap G. The first gap portion G 1  extends in the axial direction. The second gap portion G 2  extends radially inward from an end portion on the first axial side (−Y side) of the first gap portion G 1 . The third gap portion G 3  extends from an end portion of the radially inside of the second gap portion G 2  to the first axial side. The third gap portion G 3  has an opening on the first axial side in the gap G. 
     The guide wall portion  123  protrudes from the body portion  121  to the second axial side (+Y side). In the present embodiment, the guide wall portion  123  protrudes from the radially outer edge portion of the body portion  121  to the second axial side. More specifically, the guide wall portion  123  protrudes from the radially outer edge portion of the second surface  121   b  to the second axial side. The guide wall portion  123  is disposed to oppose the bearing  35  in the axial direction. More specifically, the guide wall portion  123  is disposed to oppose the outer ring  35   b  of the bearing  35  in the axial direction. The guide wall portion  123  is positioned on the first axial side (−Y side) of the bearing  35 . The radial position on the inner peripheral surface of the guide wall portion  123  is, for example, the same as the radial position on the inner peripheral surface of the outer ring  35   b  of the bearing  35 . In the example of  FIG.  2   , the guide wall portion  123  is in contact with the outer ring  35   b  of the bearing  35  in the axial direction. 
     As illustrated in  FIG.  3   , the guide wall portion  123  extends in the circumferential direction. In the present embodiment, the guide wall portion  123  has an annular shape about the central axis J. As illustrated in  FIG.  2   , guide wall portion  123  is positioned radially outside the second opening portion  115   b  of the connection channel portion  115 . The guide wall portion  123  is disposed to oppose the second opening portion  115   b  with a gap interposed therebetween. The guide wall portion  123  overlaps the second opening portion  115   b  in the radial direction. In other words, the guide wall portion  123  overlaps the second opening portion  115   b  when viewed in the radial direction. 
     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 housing channel portion  93   d  provided on the 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 housing channel portion  93   d  are provided in the lid portion  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 to the inside of the recess portion  23   g.    
     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 of the second channel portion  93   b  on the upstream side of the housing channel portion  93   d  communicates with an end portion of the third channel portion  93   c  on the downstream side. The housing channel portion  93   d  has an end portion on the downstream side that communicates with an end portion of the refrigerant supply portion  95  on the upstream side. 
     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 lid portion  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.  5   , 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 recess portion  23   g  provided in the bottom wall portion  23   a . The oil O from the first channel portion  93   a  flows into a gap in the axial direction between the nozzle flange portion  73  and the bottom wall portion  23   a.    
     The oil O having flowed into the peripheral wall portion  23   b  flows into the shaft  31  through inside the nozzle member  70 . More specifically, the oil O having flowed into the peripheral wall portion  23   b  flows into the second shaft member  110  through inside the guide tube portion  72  and inside the supply tube portion  71  in this order. As described above, in the present embodiment, providing the first channel portion  93   a  enables the oil O to be supplied from the inside of the peripheral wall portion  23   b  into the shaft  31 . The oil O having flowed into the second shaft member  110  flows into the first shaft member  31   a . A part of the oil O having flowed into the first shaft member  31   a  flows to the second axial side (+Y side) through inside the first shaft member  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 member  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 into the first shaft member  31   a  flows out of the shaft  31  through the connection channel portion  115 . Another part of the oil O having flowed into the first shaft member  31   a  flows to the first axial side (−Y side) by being pressed against the inner peripheral surface of the first shaft member  31   a  by a centrifugal force generated by the rotation of the rotor  30 , for example, and flows into the connection channel portion  115  from the first opening portion  115   a . The oil O having flowed into the connection channel portion  115  flows to the first axial side inside the first groove  114   a , then flows radially outward inside the second groove  114   b , and is discharged from the second opening portion  115   b  to the outside of the connection channel portion  115 . The oil O discharged from the second opening portion  115   b  to the outside of the connection channel portion  115  flows radially outward axially between the bearing  35  and the cover member  120 , and is supplied between the inner ring  35   a  and the outer ring  35   b  of the bearing  35 . At least a part of the oil O flowing out of the connection channel portion  115  from the second opening portion  115   b  is guided to the second axial side (+Y side) along the guide wall portion  123  and supplied to the bearing  35 . As illustrated in  FIG.  3   , at least a part of the oil O in contact with the guide wall portion  123  flows to the lower side along the guide wall portion  123  by gravity. 
     As illustrated in  FIG.  1   , the oil O having flowed into the second channel portion  93   b  flows inside of the refrigerant supply portion  95  through the housing 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 cover member  120  that covers at least a part of the electricity removal device  80  is provided. The cover member  120  is positioned axially between the bearing  35  and the electricity removal device  80 . The connection channel portion  115  that allows the inside of the shaft  31  and the outside of the shaft  31  to communicate with each other is provided. The connection channel portion  115  is open in a portion positioned on the second axial side (+Y side) relative to the cover member  120  inside the peripheral wall portion  23   b . Therefore, the cover member  120  can suppress the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  from flowing toward the electricity removal device  80 . This can suppress the oil O from reaching the electricity removal device  80 , and the electrical conductivity of the electricity removal device  80  from being lowered by 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. The oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  can be supplied to the bearing  35  as lubricating oil. As described above, according to the present embodiment, the oil O can be suitably supplied to the bearing  35  while suppressing the deterioration of the electricity removal performance of the electricity removal device  80  due to the oil O. 
     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 . 
     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 connection channel portion  115  is open in a portion of an inside of the peripheral wall portion  23   b  positioned axially between the bearing  35  and the cover member  120 . Therefore, the oil O having flowed into the peripheral wall portion  23   b  is suppressed from flowing to the first axial side (−Y side) by the cover member  120 , and flows to the second axial side (+Y side) to be supplied to the bearing  35 . Due to this, the oil O can be more easily supplied to the bearing  35 . 
     According to the present embodiment, at least a part of the connection channel portion  115  is provided in the second shaft member  110 . Therefore, the second opening portion  115   b  of the connection channel portion  115  that opens to the outside of the shaft  31  can be easily positioned close to the bearing  35 . Due to this, the oil O can be more easily supplied to the bearing  35  by the connection channel portion  115 . 
     According to the present embodiment, at least a part of the inside of the connection channel portion  115  is configured by the inside of the first groove  114   a  provided on the outer peripheral surface of the fit tube portion  111 . The first groove  114   a  extends in the axial direction and opens on the second axial side (+Y side). Therefore, at least a part of the connection channel portion  115  is provided between the first shaft member  31   a  and the second shaft member  110  in the radial direction, and a part of the oil O in the shaft  31  can be easily discharged to the outside of the shaft  31  via the connection channel portion  115 . 
     According to the present embodiment, a part of the inside of the connection channel portion  115  is configured by the inside of the second groove  114   b  provided on the surface on the second axial side (+Y side) of the flange portion  112 . The second groove  114   b  extends radially outward from an end portion on the first axial side (−Y side) of the first groove  114   a  and opens radially outward. Therefore, the oil O can be discharged radially outward from the connection channel portion  115  to the inside of the peripheral wall portion  23   b  through the second groove  114   b . Due to this, the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  can be more easily supplied to the bearing  35  disposed on the radially outside of the shaft  31 . Since the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  is caused to flow in an orientation away from the radial gap between the cover member  120  and the shaft  31  to the radial outside, the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  can be suppressed from flowing into the radial gap between the cover member  120  and the shaft  31 . This makes it possible to further suppress the oil O from reaching the electricity removal device  80 . 
     According to the present embodiment, the second shaft member  110  has the first opposing portion  112   a  disposed to oppose the cover member  120  with a gap interposed therebetween in the axial direction. Therefore, the cover member  120  and the first opposing portion  112   a  can more preferably prevent the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  from flowing into the electricity removal device  80 . As the gap G of the labyrinth seal structure  130  of the present embodiment, the gap between the cover member  120  and the second shaft member  110  is easily formed into a complicated shape, and the oil O can be more suitably suppressed from flowing to the electricity removal device  80  through the gap. 
     According to the present embodiment, the first opposing portion  112   a  is positioned on the second axial side (+Y side) of the cover member  120 . Therefore, the first opposing portion  112   a  can prevent the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  from flowing into the radial gap between the cover member  120  and the shaft  31 . Due to this, the oil O having flowed from the connection channel portion  115  into the peripheral wall portion  23   b  can be more suitably suppressed from flowing to the electricity removal device  80 . The axial gap between the first opposing portion  112   a  and the cover member  120 , that is, the radially outer end portion of the second gap portion G 2  is disposed on the opposite side of the electricity removal device  80  with the cover member  120  interposed therebetween in the axial direction. Therefore, even if the oil O flows into the second gap portion G 2 , the oil O having flowed into the second gap portion G 2  flows radially outward by centrifugal force, and is easily discharged from the radially outer end portion of the second gap portion G 2  to the opposite side of the electricity removal device  80  across the cover member  120 . This makes it possible to suppress the oil O more suitably from flowing to the electricity removal device  80  through the second gap portion G 2 . 
     According to the present embodiment, the first opposing portion  112   a  is provided in the flange portion  112 . Therefore, the oil O discharged into the peripheral wall portion  23   b  through the opening portion on the radially outside of the second groove  114   b  provided in the flange portion  112  easily flows radially outward along the flange portion  112  and is easily separated radially outward from the first opposing portion  112   a . This makes it possible to suppress the oil O from flowing into the gap in the axial direction between the first opposing portion  112   a  and the cover member  120 . Therefore, the oil O can be more suitably suppressed from flowing to the electricity removal device  80 . 
     According to the present embodiment, the cover member  120  includes the second opposing portion  121   c  that opposes the first opposing portion  112   a  with a gap in the radial direction. Therefore, the gap between the cover member  120  and the second shaft member  110  can be easily formed into a more complicated shape by the first opposing portion  112   a  and the second opposing portion  121   c , and the labyrinth seal structure  130  can be configured as in the present embodiment. Due to this, the labyrinth seal structure  130  can more suitably suppress the oil O from flowing to the electricity removal device  80 . 
     When the labyrinth seal structure  130  is provided between the shaft  31  and the cover member  120  as in the present embodiment, the shape of the shaft  31  tends to be complicated. Therefore, when the first shaft member  31   a  and the second shaft member  110  are the identical single member, it may be difficult to make the shaft  31 . On the other hand, in the present embodiment, since the first shaft member  31   a  and the second shaft member  110  are separate bodies from each other, the first opposing portion  112   a  is easily provided with respect to the second shaft member  110 , and the labyrinth seal structure  130  is easily made. 
     According to the present embodiment, the cover member  120  has an annular shape surrounding the shaft  31 . Therefore, the oil O that about to flow to the electricity removal device  80  is more suitably blocked by the cover member  120 . Due to this, the oil O can be more suitably suppressed from flowing to the electricity removal device  80 . 
     According to the present embodiment, the cover member  120  has the guide wall portion  123  disposed to oppose the bearing  35  in the axial direction. Therefore, the oil O having flowed into the peripheral wall portion  23   b  from the connection channel portion  115  can be easily guided to the bearing  35  by the guide wall portion  123 . The guide wall portion  123  extends in the circumferential direction. Therefore, as indicated by a dashed line in  FIG.  3   , at least a part of the oil O in contact with the guide wall portion  123  easily flows in the circumferential direction along the guide wall portion  123 . Due to this, the oil O can be easily supplied to the bearing  35  in a relatively wide range in the circumferential direction. Therefore, the oil O can be more suitably supplied to the bearing  35 . When the shaft  31  extends in the horizontal direction as in the present embodiment, at least a part of the oil O in contact with the guide wall portion  123  easily flows to a lower side along the guide wall portion  123  using gravity. Due to this, the oil O can be easily flown in the circumferential direction along the guide wall portion  123 , and the oil O can be more suitably supplied to the bearing  35 . 
     According to the present embodiment, the connection channel portion  115  is open toward the guide wall portion  123 . Therefore, the oil O discharged from the connection channel portion  115  into the peripheral wall portion  23   b  can be easily brought into contact with the guide wall portion  123 . Due to this, the oil O is more easily guided to the bearing  35  by the guide wall portion  123 . 
     According to the present embodiment, the inner peripheral surface of the second shaft member  110  has the first inclined surface  111   c  positioned radially outward toward the second axial side (+Y side). Therefore, in the second shaft member  110 , the oil O pressed against the first inclined surface  111   c  by the centrifugal force easily flows to the second axial side, that is, the side on which the first shaft member  31   a  is positioned. Due to this, the oil O in the second shaft member  110  can be suppressed from flowing to the opening end portion  110   a . Therefore, it is possible to suppress the oil O from flowing out to the outside of the shaft  31  through the opening end portion  110   a  and reaching the electricity removal device  80 . Since the oil O flows to the second axial side along the first inclined surface  111   c , the oil O is easily guided to the coupling portion between the first shaft member  31   a  and the second shaft member  110 . Therefore, when the connection channel portion  115  is provided between the first shaft member  31   a  and the second shaft member  110  as in the present embodiment, the oil O can be easily guided to the connection channel portion  115 . 
     According to the present embodiment, the nozzle member  70  includes the outer tube portion  75  inserted into the second shaft member  110  from the opening end portion  110   a , and the supply tube portion  71  positioned away on the radially inside of the outer tube portion  75  and open to the inside of the shaft  31 . As described above, by providing the outer tube portion  75  on the radially outside of the supply tube portion  71 , it is possible to increase the outer diameter of the portion of the nozzle member  70  to be inserted into the second shaft member  110  while relatively reducing the inner diameter and the outer diameter of the supply tube portion  71 . Therefore, while reducing the gap between the second shaft member  110  and the nozzle member  70  to suppress the oil O from flowing to the opening end portion  110   a , the inner diameter of the supply tube portion  71  can be reduced to suitably adjust the flow rate of the oil O supplied from the supply tube portion  71  to the shaft  31 . As compared with the case where the supply tube portion  71  communicates with the second axial side (+Y side) of the outer tube portion  75 , the axial position of the supply tube portion  71  can be set to the first axial side (−Y side). Therefore, the axial position of the supply tube portion  71  can be easily set to the first axial side relative to the first opening portion  115   a  of the connection channel portion  115 . Due to this, the oil O discharged from the supply tube portion  71  to the first axial side can easily flow into the connection channel portion  115  through the first opening portion  115   a.    
     For example, even if the outer diameter of the supply tube portion  71  is made the same in size as the outer diameter of the outer tube portion  75  and the inner diameter of the supply tube portion  71  is made relatively small instead of providing the outer tube portion  75 , the flow rate of the oil O supplied from the supply tube portion  71  to the shaft  31  can be suitably adjusted while suppressing the oil O from flowing to the opening end portion  110   a . However, in this case, the thickness of the supply tube portion  71  increases, and sink marks and the like are likely to occur when the nozzle member  70  is formed by metallic molding. Therefore, by separately providing the outer tube portion  75 , it is possible to suppress the outflow of the oil O from the opening end portion  110   a  and to suitably adjust the flow rate of the oil O supplied from the supply tube portion  71  to the shaft  31  while easily forming the nozzle member  70  suitably by metallic molding. 
     According to the present embodiment, the end portion on the second axial side (+Y side) of the supply tube portion  71  is positioned on the first axial side (−Y side) relative to the end portion on the second axial side of the outer tube portion  75  and the connection channel portion  115 . Therefore, the oil O discharged from the supply tube portion  71  to the first axial side can more easily flow into the connection channel portion  115 . 
     According to the present embodiment, the radial gap between the outer tube portion  75  and the second shaft member  110  is smaller than the radial gap between the outer tube portion  75  and the supply tube portion  71 . Therefore, it is easy to relatively reduce the radial gap between the outer tube portion  75  and the second shaft member  110 . This make it possible to further suppress the oil O from flowing to the opening end portion  110   a  through the radial gap between the outer tube portion  75  and the second shaft member  110 . Therefore, it is possible to further suppress the oil O from flowing out from the opening end portion  110   a  and flowing to the electricity removal device  80 . 
     According to the present embodiment, the inner peripheral surface of the first shaft member  31   a  has the fourth inclined surface  31   d  positioned radially outward towards the first axial side (−Y side). The fourth inclined surface  31   d  is positioned on the second axial side (+Y side) relative to the connection channel portion  115 . Therefore, the oil O pressed against the inner peripheral surface of the first shaft member  31   a  by the centrifugal force easily flows to the first axial side along the fourth inclined surface  31   d  and is easily guided into the connection channel portion  115 . 
     In the following description, configurations similar to those of the above-described embodiment may be denoted by the identical reference numerals as appropriate, and description may be omitted. As illustrated in  FIG.  6   , in a rotating electrical machine  210  of a drive device  200  of the present embodiment, an outer tube portion  275  of a nozzle member  270  includes an outer tube body portion  275   a  and an enlarged-diameter portion  275   b . The configuration of the outer tube body portion  275   a  is similar to that of the outer tube portion  75  of the first embodiment. 
     The enlarged-diameter portion  275   b  communicates with the second axial side (+Y side) of the outer tube body portion  275   a . The enlarged-diameter portion  275   b  has a cylindrical shape that opens on the second axial side about the central axis J. The inner diameter and the outer diameter of the enlarged-diameter portion  275   b  increase toward the second axial side. The enlarged-diameter portion  275   b  is positioned radially inside the first inclined surface  111   c  except for an end portion on the first axial side (−Y side). 
     The outer peripheral surface of the enlarged-diameter portion  275   b  is a second inclined surface  275   c  radially opposing to the first inclined surface  111   c . That is, a portion of the outer peripheral surface of the nozzle member  270  opposing the inner peripheral surface of the second shaft member  110  has the second inclined surface  275   c . The second inclined surface  275   c  is positioned radially outward toward the second axial side (+Y side). Therefore, it is possible to narrow a radial gap between the first inclined surface  111   c  and the second inclined surface  275   c . This makes it possible to further suppress the oil O from flowing from the gap between the nozzle member  270  and the second shaft member  110  to the opening end portion  110   a . In the present embodiment, the second inclined surface  275   c  is a cylindrical surface whose inner diameter increases toward the second axial side about the central axis J. The shape of the second inclined surface  275   c  is similar to the outer peripheral surface of a truncated cone whose outer diameter increases toward the second axial side. The second inclined surface  275   c  is a surface along the first inclined surface  111   c . In the present embodiment, the angle at which the second inclined surface  275   c  is inclined with respect to the axial direction is the same as the angle at which the first inclined surface  111   c  is inclined with respect to the axial direction. 
     The inner peripheral surface of the enlarged-diameter portion  275   b  is a third inclined surface  275   d  positioned radially outward toward the second axial side (+Y side). That is, the inner peripheral surface of the outer tube portion  275  has the third inclined surface  275   d . Therefore, in the outer tube portion  275 , the oil O pressed against the third inclined surface  275   d  by the centrifugal force easily flows to the second axial side, that is, the inside of the shaft  31 . This makes it possible to cause the oil O in the outer tube portion  275  to suitably flow into the shaft  31 . Therefore, the oil O can be suitably supplied into the shaft  31  by the nozzle member  270 . In the present embodiment, the third inclined surface  275   d  is a cylindrical surface whose inner diameter increases toward the second axial side about the central axis J. The shape of the third inclined surface  275   d  is similar to the outer peripheral surface of a truncated cone whose outer diameter increases toward the second axial side. In the present embodiment, the angle at which the third inclined surface  275   d  is inclined with respect to the axial direction is the same as the angle at which the second inclined surface  275   c  is inclined with respect to the axial direction. 
     Other configurations of each portion of the rotating electrical machine  210  can be made similar to the other configurations of each portion of the rotating electrical machine  10  of the first embodiment. The other configuration of each portion of the drive device  200  can be made similar to the other configuration of each portion of the drive device  100  of the first embodiment. 
     In the following description, configurations similar to those of the above-described embodiments may be denoted by the identical reference numerals as appropriate, and description may be omitted. As illustrated in  FIG.  7   , in a rotating electrical machine  310  of a drive device  300  of the present embodiment, a second shaft member  340  of a shaft  331  includes a body portion  341  and a first opposing portion  342 . 
     The body portion  341  has a cylindrical shape that opens on both axial sides about the central axis J. An end portion on the first axial side (−Y side) of the first shaft member  31   a  is press-fitted into an end portion on the second axial side (+Y side) of the body portion  341 . The brush portion  82  of the electricity removal device  80  is in contact with the outer peripheral surface of an end portion on the first axial side of the body portion  341 . 
     The body portion  341  has a through hole  314  penetrating the wall portion of the body portion  341  in the radial direction. The through hole  314  is provided in a portion of the body portion  341  positioned on the first axial side (−Y side) relative to the first shaft member  31   a  and on the second axial side (+Y side) relative to the nozzle member  70 . A plurality of through holes  314  are provided at intervals in the circumferential direction. Each of the through holes  314  constitutes a connection channel portion  315  allowing the inside of the shaft  331  and the outside of the shaft  331  to communicate with each other. In the present embodiment, the entire connection channel portion  315  is provided in the second shaft member  340 . 
     The first opposing portion  342  protrudes radially outward from the outer peripheral surface of the body portion  341 . The first opposing portion  342  has an annular shape about the central axis J. The first opposing portion  342  is positioned on the first axial side (−Y side) relative to the connection channel portion  315 . The first opposing portion  342  is positioned on the second axial side (+Y side) of the radially inner end portion of the cover member  350 . Other configurations of the second shaft member  340  can be made similar to the other configurations of the second shaft member  110  of the first embodiment. 
     The cover member  350  has an annular shape about the central axis J and has a flat plate shape whose plate surface faces the axial direction. Unlike the cover member  120  of the first embodiment, the cover member  350  does not have a portion radially opposing the first opposing portion  342 . Other configurations of the cover member  350  can be made similar to the other configurations of the cover member  120  of the first embodiment. 
     Other configurations of each portion of the rotating electrical machine  310  can be made similar to the other configurations of each portion of the rotating electrical machine  10  of the first embodiment. Other configurations of each portion of the drive device  300  can be made similar to the other configurations of each portion of the drive device  100  of the first embodiment. 
     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 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 a carbon brush. 
     The cover member covering at least a part of the electricity removal device may have any configuration as long as the cover member is positioned axially between the bearing held in the peripheral wall portion and the electricity removal device. The cover member needs not be annular. A plurality of cover members may be provided at intervals in the circumferential direction. The first opposing portion provided on the second shaft member may be disposed on any side in the axial direction with respect to the cover member as long as the first opposing portion opposes the cover member with a gap in the axial direction. 
     The nozzle member may have any shape. The outer peripheral surface of the nozzle member may be in contact with the inner peripheral surface of the shaft. Any type of fluid may be used as the fluid supplied into inside the shaft from the nozzle member. 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 connection channel portion allowing the inside of the shaft and the outside of the shaft to communicate with each other may have any configuration as long as the connection channel portion is open in a portion positioned on the second axial side relative to the cover member in the inside of the peripheral wall portion in the housing of the rotating electrical machine. The bearing supplied with the fluid by the connection channel portion may be any type of bearing. 
     The connection channel portion may have a configuration as a connection channel portion  415  indicated by a double-dashed line in  FIG.  2   . The connection channel portion  415  is provided in the first shaft member  31   a . The connection channel portion  415  is configured by a through hole penetrating the wall portion of the first shaft member  31   a  in the radial direction. The connection channel portion  415  is open in a portion positioned on the second axial side (+Y side) relative to the bearing  35  of the inside of the peripheral wall portion  23   b . The connection channel portion  415  opens in a space axially between resolver  50  and bearing  35 . A plurality of the connection channel portions  415  are provided at intervals in the circumferential direction. 
     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.