Drive device

Abstract

The utility model provides a driving device. The drive device includes: a motor having a rotor capable of rotating about a central axis; the gear mechanism is connected with the rotor; a bearing that rotatably supports at least a portion of the gear mechanism; a housing having a bearing holding portion for holding the bearing, the housing accommodating the motor and the gear mechanism therein; a first flow path portion extending in the axial direction; a second flow path section connected to the first flow path section and extending in an intersecting direction intersecting the axial direction; and a sealing member. The housing has a hole portion extending from an outer surface of the housing to an interior of the bearing holding portion. The second flow path portion is configured from at least a portion of the hole portion and is connected to the inside of the bearing holding portion. An open end portion of the hole portion, which opens at the outer surface of the housing, is closed by a sealing member.

Description

Technical Field

[0001] The utility model relates to a driving device. Background Art

[0002] Conventionally, there is known a motor-integrated drive device having a structure in which a bearing portion is lubricated with lubricating oil (for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-106776

[0004] In the above-mentioned motor-built-in drive device, a flow path portion is sometimes provided to supply lubricating oil to the inside of the holding portion holding the bearing portion. In this case, when at least a part of the flow path portion is formed by a groove, the lubricating oil may leak from the opening of the groove. Therefore, the amount of lubricating oil supplied to the inside of the holding portion holding the bearing portion may become insufficient. Utility Model Content

[0005] In view of the above situation, one of the objects of the present invention is to provide a drive device having a structure capable of suppressing insufficient supply of a fluid into a bearing holding portion.

[0006] The first mode of the present invention provides a driving device, characterized in that the driving device comprises: a motor having a rotor capable of rotating around a central axis; a gear mechanism connected to the rotor; a bearing supporting at least a portion of the gear mechanism so as to be rotatable; a housing having a bearing retaining portion for retaining the bearing, the housing accommodating the motor and the gear mechanism internally; a first flow path portion extending in an axial direction; a second flow path portion connected to the first flow path portion and extending in a cross direction intersecting the axial direction; and a sealing component, the housing having a hole portion extending from an outer surface of the housing to an interior of the bearing retaining portion, the second flow path portion being composed of at least a portion of the hole portion and being connected to the interior of the bearing retaining portion, an opening end of the hole portion opening on the outer surface of the housing being closed by the sealing component.

[0007] A second aspect of the drive device of the present invention is characterized in that, in the first aspect of the drive device, a portion of the gear mechanism supported by the bearing is rotatable about an axis extending in the axial direction, and the open end is located above the axis in the vertical direction.

[0008] The third type of driving device of the present invention is characterized in that, in the first type of driving device, the gear mechanism has: a reduction device, which is connected to the rotor; and a differential device, which is connected to the reduction device, the reduction device has a gear that can rotate around an axis extending in the axial direction and passing through the bearing retaining portion, the differential device has a gear that can rotate around a differential axis extending in the axial direction, the differential axis is located on one side of the vertical direction perpendicular to both the axial direction and the up and down directions than the axis, and the opening end is located on the other side of the vertical direction than the axis.

[0009] The fourth mode of the drive device of the present invention is characterized in that, in the first mode of the drive device, the gear mechanism has: a reduction device, which is connected to the rotor; and a differential device, which is connected to the reduction device, the reduction device has a gear that can rotate around an axis extending axially and passing through the bearing retaining portion, the differential device has a gear that can rotate around a differential axis extending axially, and the differential axis and the opening end are located on one side of the vertical direction perpendicular to both the axial direction and the up and down directions than the axis.

[0010] A fifth aspect of the drive device of the utility model is characterized in that, in the first aspect of the drive device, a plurality of the bearing retaining parts are provided, a plurality of the second flow path parts are provided, and the plurality of second flow path parts are connected to the interiors of different bearing retaining parts.

[0011] A driving device according to a sixth aspect of the present invention is characterized in that, in the driving device according to the first aspect, a plurality of second flow path portions are provided, and two or more second flow path portions are connected inside the bearing holding portion.

[0012] The seventh aspect of the driving device of the present invention is characterized in that, in the fifth aspect of the driving device, the plurality of second flow path portions include two or more second flow path portions connected to each other, and the parts of the two or more second flow path portions connected to each other are connected to the first flow path portion.

[0013] The driving device of the eighth aspect of the present invention is characterized in that, in the driving device of the first aspect, the flow path cross-sectional area of ​​the portion of the first flow path portion connected to the second flow path portion and the flow path cross-sectional area of ​​the portion of the second flow path portion connected to the interior of the bearing retaining portion are the same as each other.

[0014] The driving device of the ninth aspect of the present invention is characterized in that, in the driving device of the first aspect, a supply hole opening to the inside of the shell is provided in the first flow path portion, and the flow path cross-sectional area of ​​a portion of the first flow path portion connected to the second flow path portion is smaller than the flow path cross-sectional area of ​​a portion of the first flow path portion in which the supply hole is provided.

[0015] The driving device of the tenth aspect of the present utility model is characterized in that, in the driving device of the first aspect, the hole portion has: a first hole portion, which is open on the outer surface of the outer shell; and a second hole portion, which is connected to the inside of the bearing retaining portion, in a cross-section perpendicular to the intersection direction, the cross-sectional area of ​​the first hole portion is larger than the cross-sectional area of ​​the second hole portion, and the part of the second flow path portion formed by the first hole portion is connected to the first flow path portion.

[0016] The driving device of the eleventh aspect of the present invention is characterized in that in any one of the driving devices of the first aspect to the tenth aspect, the outer shell has an axially recessed groove, which extends along the cross direction, and the groove opens to the inside of the outer shell, is connected to the inside of the bearing retaining portion, and overlaps with the second flow path portion in the axial direction.

[0017] According to the present invention, in the drive device, it is possible to suppress insufficient supply of the fluid into the bearing holding portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram schematically showing the driving device in the first embodiment.

[0019] Figure 2 This is a diagram showing the gear cover and the extending portion in the first embodiment as viewed from one axial side.

[0020] Figure 3 It is a perspective view showing a part of the gear cover in the first embodiment.

[0021] Figure 4 It is a cross-sectional view showing a part of the driving device in the first embodiment.

[0022] Figure 5 is a perspective view showing a portion of the gear cover in the first embodiment, which is viewed from the Figure 3 A portion of the gear cover viewed from different angles.

[0023] Figure 6 It is a cross-sectional view showing a part of the driving device in the second embodiment.

[0024] Figure 7 It is a diagram showing a part of the driving device in the third embodiment.

[0025] Figure 8 It is a diagram showing a part of the driving device in the fourth embodiment.

[0026] Fig. 9 It is a diagram showing a part of the driving device in the fifth embodiment.

[0027] Description of symbols

[0028] 10: Motor; 11: Rotor; 25a, 25b, 25c, 25d, 25e: Bearing; 20: Gear mechanism; 21: Speed ​​reduction device; 22: Differential device; 22a: Ring gear (gear); 24b: Second gear (gear); 24c: Third gear (gear); 30, 230, 330, 430, 530: Housing; 35a, 35b, 35c, 35d, 35e: Bearing holding portion; 39: Groove; 40, 240, 440, 540: First flow path portion; 41d: Supply hole; 50, 250, 350, 350a , 450, 450a, 450b, 550: second flow path portion; 60, 260, 360, 460a, 460b, 560: sealing component; 70, 270, 370, 470a, 470b, 570: hole portion; 70d, 270d, 370d, 470c, 470d, 570d: opening end portion; 71: first hole portion; 72: second hole portion; 90: flow path; 100, 200, 300, 400, 500: driving device; D1: first direction (cross direction); J1: center axis; J3: differential axis. DETAILED DESCRIPTION

[0029] In the accompanying drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the up-down direction. The side to which the arrow of the Z-axis points (+Z side) is the upper side, and the opposite side to which the arrow of the Z-axis points (-Z side) is the lower side. The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-to-back direction of a vehicle equipped with a drive device in the following embodiments. In the following embodiments, the side to which the arrow of the X-axis points (+X side) is the front side of the vehicle, and the opposite side to which the arrow of the X-axis points (-X side) is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the side to which the arrow of the Y-axis points (+Y side) is the right side of the vehicle, and the opposite side to which the arrow of the Y-axis points (-Y side) is the left side of the vehicle.

[0030] In addition, the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the -X side may be the front side of the vehicle. In this case, the +Y side is the left side of the vehicle and the -Y side is the right side of the vehicle. In addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "vertical direction" also includes a substantially vertical direction.

[0031] The center axis J1 shown in the figure appropriately is an imaginary axis extending in a direction intersecting the up-down direction. In more detail, the center axis J1 extends in the Y-axis direction perpendicular to the up-down direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the center axis J1 is referred to as the "axial direction", the radial direction centered on the center axis J1 is referred to as the "radial direction", and the circumferential direction centered on the center axis J1, that is, the direction around the center axis J1, is referred to as the "circumferential direction θ1". The circumferential direction θ1 is appropriately indicated by the arrow θ1 in the figure. In the following description, the right side (+Y side) in the axial direction is referred to as the "one side of the axial direction", and the left side (-Y side) in the axial direction is referred to as the "other side of the axial direction". The up-down direction is, for example, the vertical direction, and the front-back direction and the left-right direction (axial direction) are, for example, the horizontal direction perpendicular to the vertical direction. In the following embodiments, the front-back direction (X-axis direction) is equivalent to the "vertical direction" perpendicular to both the axial direction and the up-down direction. The rear side (-X side) is equivalent to the "one side of the vertical direction", and the front side (+X side) is equivalent to the "other side of the vertical direction".

[0032] <First embodiment>

[0033] Figure 1 The drive device 100 of the present embodiment shown is a drive device mounted on a vehicle and rotates the axle. The vehicle equipped with the drive device 100 is a vehicle that uses a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). Figure 1 As shown, the driving device 100 includes a motor 10, a gear mechanism 20, and a housing 30. The housing 30 accommodates the motor 10 and the gear mechanism 20 therein. The housing 30 includes a motor housing 31 accommodating the motor 10 therein and a gear housing 32 accommodating the gear mechanism 20 therein.

[0034] The motor 10 has a rotor 11 that can rotate around a central axis J1 and a stator 12 that is opposite to the rotor 11 with a gap therebetween. The rotor 11 has a motor shaft 11a arranged along the central axis J1 and a rotor core 11b fixed to the motor shaft 11a. The motor shaft 11a can rotate around the central axis J1. The motor shaft 11a extends in the axial direction. In the present embodiment, the motor shaft 11a is a hollow shaft extending in the horizontal direction. The motor shaft 11a is supported by a pair of bearings 13a and 13b so as to be rotatable around the central axis J1. The pair of bearings 13a and 13b are, for example, rolling bearings such as ball bearings. The motor shaft 11a has a hole portion 11c that connects the inside of the motor shaft 11a with the outside of the motor shaft 11a. A plurality of hole portions 11c are provided at intervals in the circumferential direction θ1.

[0035] The stator 12 is located radially outside the rotor 11. The stator 12 is in a ring shape surrounding the rotor 11. The stator 12 has a stator core 12a and a coil assembly 12b. The stator core 12a is located radially outside the rotor core 11b and is arranged opposite to the rotor core 11b with a gap therebetween. The stator core 12a is composed of a plurality of plate members such as electromagnetic steel plates stacked in the axial direction. The coil assembly 12b has a plurality of coils 12c mounted on the stator core 12a. The plurality of coils 12c are electrically connected to the inverter unit 15 housed inside the housing 30 via a bus bar 14. The coil assembly 12b has coil ends 12d and 12e that protrude axially from the stator core 12a.

[0036] The gear mechanism 20 is connected to the rotor 11. More specifically, the gear mechanism 20 is connected to the end of the motor shaft 11a on the other axial side (-Y side). The gear mechanism 20 transmits the rotation of the rotor 11 to the axle of the vehicle. The gear mechanism 20 has a reduction gear 21 connected to the rotor 11 and a differential device 22 connected to the reduction gear 21.

[0037] The reduction gear 21 includes a first gear shaft 23a, a second gear shaft 23b, a first gear 24a, a second gear 24b and a third gear 24c. The first gear shaft 23a extends in the axial direction. The first gear shaft 23a is supported by a pair of bearings 25a and 25b so as to be rotatable around the central axis J1. The pair of bearings 25a and 25b are, for example, rolling bearings such as ball bearings. The first gear shaft 23a is located on the other axial side (-Y side) of the motor shaft 11a. The first gear shaft 23a is connected to the motor shaft 11a in the axial direction.

[0038] The second gear shaft 23b is rotatable about an intermediate axis J2 extending in the axial direction. In the present embodiment, the intermediate axis J2 is a virtual axis extending parallel to the central axis J1. Figure 2As shown, the intermediate axis J2 is, for example, located above the center axis J1 and located on the rear side (-X side) of the center axis J1. In the present embodiment, the intermediate axis J2 is equivalent to an axis extending in the axial direction and passing through the bearing retaining portion 35c described later. In the following description, the circumferential direction centered on the intermediate axis J2, that is, the direction around the intermediate axis J2, is referred to as "circumferential direction θ2". The circumferential direction θ2 is appropriately indicated by the arrow θ2 in the figure. As shown in FIG. Figure 1 As shown, the second gear shaft 23b extends in the axial direction. The second gear shaft 23b is supported by a pair of bearings 25c and 25d so as to be rotatable around the intermediate axis J2. That is, the portion of the gear mechanism 20 supported by the bearing 25c held in the bearing holding portion 35c described later, i.e., the second gear shaft 23b, can rotate around the intermediate axis J2 as an axis extending in the axial direction. The pair of bearings 25c and 25d are rolling bearings such as ball bearings, for example.

[0039] The first gear 24a is arranged on the outer peripheral surface of the first gear shaft 23a. The second gear 24b and the third gear 24c are arranged on the outer peripheral surface of the second gear shaft 23b. The second gear 24b is meshed with the first gear 24a. The third gear 24c is located at a position closer to the axial side (+Y side) than the first gear 24a and the second gear 24b. In the present embodiment, the reduction gear 21 has the second gear 24b and the third gear 24c as gears that can rotate around the intermediate axis J2.

[0040] The differential device 22 includes a ring gear 22a, a differential case 22b, and a differential mechanism 22c. The ring gear 22a is rotatable about a differential axis J3 extending in the axial direction. In the present embodiment, the differential axis J3 is a virtual axis extending parallel to the center axis J1. Figure 2 As shown in FIG. 1 , the differential axis J3 is located, for example, above the central axis J1 and below the intermediate axis J2. The differential axis J3 is located, for example, at the rear side (-X side) of the central axis J1 and the intermediate axis J2. Figure 1 As shown, the ring gear 22a meshes with the third gear 24c. The ring gear 22a is fixed to the differential case 22b. The lower end of the ring gear 22a is immersed in the oil O stored in the gear housing 32. The oil O is lifted up by the rotation of the ring gear 22a. The lifted oil O is provided to the reduction gear 21 and the differential device 22 as lubricating oil, for example.

[0041] The differential case 22b includes: a case portion 22d, which accommodates the differential mechanism portion 22c inside; and a pair of differential case shafts 22e and 22f, which extend axially from the case portion 22d. The differential case shaft 22e extends from the case portion 22d to the other axial side (-Y side). The differential case shaft 22f extends from the case portion 22d to one axial side (+Y side). The pair of differential case shafts 22e and 22f are cylindrical with the differential axis J3 as the center. The differential case shaft 22e is supported by a bearing 25e so as to be rotatable around the differential axis J3. The bearing 25e is, for example, a rolling bearing such as a ball bearing. Although not shown in the figure, the differential case shaft 22f is also supported by a bearing so as to be rotatable around the differential axis J3 in the same manner as the differential case shaft 22e.

[0042] The differential mechanism 22c is located inside the differential case 22b. The rotation of the ring gear 22a is transmitted to the differential mechanism 22c via the differential case 22b. A pair of output shafts 22g are connected to the differential mechanism 22c. The pair of output shafts 22g are respectively passed into the inside of a pair of differential case shafts 22e and 22f. Wheels not shown are respectively connected to the pair of output shafts 22g. The differential mechanism 22c absorbs the speed difference between the left and right wheels while transmitting torque to the output shafts 22g of the left and right wheels when the vehicle turns.

[0043] The torque output from the motor 10 is transmitted to the ring gear 22a of the differential device 22 via the motor shaft 11a, the first gear shaft 23a, the first gear 24a, the second gear 24b, the second gear shaft 23b, and the third gear 24c. The torque of the motor 10 transmitted to the ring gear 22a is transmitted to the wheels via the differential mechanism portion 22c and the output shaft 22g. In this way, the gear mechanism 20 transmits the torque of the motor 10 to the wheels of the vehicle.

[0044] In the housing 30 of the present embodiment, the motor housing 31 and the gear housing 32 are arranged in the axial direction. The gear housing 32 is located on the other axial side (-Y side) of the motor housing 31. The gear housing 32 is connected to the other axial side of the motor housing 31. In the present embodiment, the housing 30 has a housing body 30a, a motor cover 30b and a gear cover 30c. The housing body 30a, the motor cover 30b and the gear cover 30c are separate from each other. The housing body 30a has a first circumferential wall portion 30d, a second circumferential wall portion 30e and a partition wall portion 33. In the present embodiment, the gear housing 32 is composed of a partition wall portion 33, a second circumferential wall portion 30e and a gear cover 30c. In the present embodiment, the motor housing 31 is composed of a partition wall portion 33, a first circumferential wall portion 30d and a motor cover 30b.

[0045] The first peripheral wall portion 30d is in the shape of a tube that opens on one axial side (+Y side). A partition wall portion 33 is provided at the end of the other axial side (-Y side) of the first peripheral wall portion 30d. The opening on one axial side of the first peripheral wall portion 30d is closed by a motor cover 30b fixed to the end of one axial side of the first peripheral wall portion 30d. A bearing retaining portion 34a that retains the bearing 13a is provided on the motor cover 30b. The second peripheral wall portion 30e is in the shape of a tube that opens on the other axial side. A partition wall portion 33 is provided at the end of one axial side of the second peripheral wall portion 30e. The opening on the other axial side of the second peripheral wall portion 30e is closed by a gear cover 30c fixed to the end of the other axial side of the second peripheral wall portion 30e. The gear cover 30c has: a cover portion 30f that covers the gear mechanism 20 from one axial side; and a third peripheral wall portion 30g that protrudes from the radial outer edge of the cover portion 30f to one axial side. The end of the third peripheral wall portion 30g on one axial side is connected to the end of the second peripheral wall portion 30e on the other axial side. A bearing holding portion 35a for holding the bearing 25a, a bearing holding portion 35c for holding the bearing 25c, and a bearing holding portion 35e for holding the bearing 25e are provided on the surface of the cover portion 30f on one axial side. Each bearing holding portion 35a, 35c, 35e is in a substantially annular shape surrounding each bearing 25a, 25c, 25e.

[0046] The partition wall portion 33 divides the interior of the motor housing 31 and the interior of the gear housing 32. The partition wall portion 33 is a wall portion that axially separates the interior of the motor housing 31 from the interior of the gear housing 32. The partition wall portion 33 has a partition wall opening 33a that connects the interior of the motor housing 31 and the interior of the gear housing 32.

[0047] A bearing retaining portion 34b for retaining the bearing 13b is provided on a portion of the partition wall portion 33 that constitutes a portion of the inner surface of the motor housing 31, that is, on a surface on one axial side (+Y side) of the partition wall portion 33. A bearing retaining portion 35b for retaining the bearing 25b and a bearing retaining portion 35d for retaining the bearing 25d are provided on a portion of the partition wall portion 33 that constitutes a portion of the inner surface of the gear housing 32, that is, on a surface on the other axial side (-Y side) of the partition wall portion 33. Each of the bearing retaining portions 34b, 35b, 35d is in a substantially annular shape surrounding each of the bearings 13b, 25b, 25d. The interior of the bearing retaining portion 34b and the interior of the bearing retaining portion 35b are connected to each other in the axial direction, forming a hole 33b that penetrates the partition wall portion 33 in the axial direction.

[0048] In the present embodiment, the housing 30 has a storage portion P for storing oil O as a fluid. The oil O is used as a refrigerant for cooling the motor 10. In addition, the oil O is used as a lubricant for the reduction gear 21 and the differential gear 22. As the oil O, for example, in order to function as a refrigerant and a lubricant, it is preferable to use an oil equivalent to an automatic transmission lubricant (ATF: Automatic Transmission Fluid) with a relatively low viscosity. The storage portion P is composed of a portion on the lower side of the housing 30. The storage portion P has a first storage portion P1 provided in the motor housing 31 and a second storage portion P2 provided in the gear housing 32. The interior of the first storage portion P1 is composed of a lower area inside the motor housing 31. The interior of the second storage portion P2 is composed of a lower area inside the gear housing 32. The interior of the first storage portion P1 and the interior of the second storage portion P2 are connected to each other via a partition wall opening 33a.

[0049] As described above, the drive device 100 includes bearings 25a, 25b, 25c, 25d, and 25e that support at least a portion of the gear mechanism 20 so that it can rotate, and bearing retaining portions 35a, 35b, 35c, 35d, and 35e that retain each bearing 25a, 25b, 25c, 25d, and 25e. In the present embodiment, each bearing 25a, 25b, 25c, 25d, and 25e supports a portion of the gear mechanism 20 so that it can rotate. In the present embodiment, the bearing retaining portion 35c that retains the bearing 25c is a bearing retaining portion that is connected to the second flow path portion 50 described later. In addition, as the structure of the bearing retaining portion 35a, 35b, 35d, and 35e, except that the interior is not connected to the second flow path portion 50, the same structure as the bearing retaining portion 35c described below can be adopted.

[0050] like Figure 3 As shown, the bearing holding portion 35c includes an opposing wall portion 35j, a peripheral wall portion 35f, and a support portion 35g. The opposing wall portion 35j is a portion of the cover portion 30f that is axially opposed to the bearing 25c. The opposing wall portion 35j is located on the other axial side (-Y side) of the bearing 25c.

[0051] The peripheral wall portion 35f protrudes from the opposing wall portion 35j toward one axial side (+Y side). Figure 2 As shown, the peripheral wall portion 35f surrounds the bearing 25c. In this embodiment, the peripheral wall portion 35f is substantially annular with the intermediate axis J2 as the center. The peripheral wall portion 35f is open on one side in the axial direction. Figure 3As shown, the peripheral wall portion 35f is provided with a through portion 35h that penetrates a portion of the peripheral wall portion 35f from the inner side surface to the outer side surface of the peripheral wall portion 35f. In the present embodiment, the through portion 35h is a groove that opens on one side in the axial direction. In addition, the through portion 35h may also be a hole that penetrates a portion of the peripheral wall portion 35f from the inner side surface to the outer side surface. The through portion 35h penetrates a portion of the peripheral wall portion 35f in a first direction D1 that intersects the axial direction. In the present embodiment, the first direction D1 is equivalent to the "intersecting direction".

[0052] In the present embodiment, the first direction D1 is a direction that intersects the up-down direction. In more detail, the first direction D1 is a direction perpendicular to the axial direction, and is a direction that intersects both the up-down direction and the front-back direction (X-axis direction). The first direction D1 is a direction that is located on the lower side as it is directed toward the rear side (-X side). The inclination of the first direction D1 relative to the front-back direction is smaller than the inclination of the first direction D1 relative to the up-down direction. In the following description, the side (+D1 side) to which the arrow of the illustrated D1 axis in the first direction D1 points is referred to as "one side of the first direction", and the opposite side (-D1 side) to which the arrow of the D1 axis points is referred to is referred to as "the other side of the first direction". One side of the first direction is the rear side and the lower side, and the other side of the first direction is the front side (+X side) and the upper side.

[0053] like Figure 3 As shown, the support portion 35g protrudes from the opposing wall portion 35j to one axial side (+Y side) on the inner side of the peripheral wall portion 35f. The support portion 35g is connected to the inner edge of the peripheral wall portion 35f. The end of the support portion 35g on one axial side is located closer to the other axial side (-Y side) than the end of the peripheral wall portion 35f on one axial side. Figure 2 As shown in FIG. 1 , in this embodiment, the support portion 35g is substantially annular shaped with the intermediate axis J2 as the center. The support portion 35g supports the outer peripheral edge of the bearing 25c from the other axial side. Figure 4 As shown, by providing the support portion 35g that supports the bearing 25c from the other axial side, a gap G is provided between the bearing 25c and the facing wall portion 35j in the axial direction.

[0054] like Figure 3 As shown, the support portion 35g is provided with a through portion 35i that penetrates a portion of the support portion 35g from the inner side surface to the outer side surface of the support portion 35g. The through portion 35i penetrates a portion of the support portion 35g in the first direction D1. In this embodiment, the through portion 35i is a groove that opens on one axial side (+Y side). In addition, the through portion 35i may also be a hole that penetrates a portion of the support portion 35g from the inner side surface to the outer side surface.

[0055] The housing 30 has a retaining cylinder 36 protruding from the surface of the axial side (+Y side) of the cover portion 30f to the axial side. The retaining cylinder 36 is roughly cylindrical and opens on one side in the axial direction. The retaining cylinder 36 is located outside the bearing retaining portion 35c when viewed in the axial direction. In the present embodiment, the retaining cylinder 36 is located at a position closer to the front side (+X side) than the bearing retaining portion 35c. The retaining cylinder 36 is located at a position closer to the upper side than the intermediate axis J2. The retaining cylinder 36 has a through portion 36a that penetrates the retaining cylinder 36 in the axial direction. The interior of the through portion 36a is composed of the interior of the cylindrical retaining cylinder 36.

[0056] The housing 30 has a pair of connecting ribs 37a and 37b that connect the bearing holding portion 35c and the holding cylinder portion 36. The pair of connecting ribs 37a and 37b extend along the first direction D1. The pair of connecting ribs 37a and 37b are arranged at intervals from each other in the second direction D2 that intersects both the axial direction and the first direction D1. In the present embodiment, the second direction D2 is a direction perpendicular to both the axial direction and the first direction D1. The second direction D2 is a direction that is located on the rear side (-X side) as it moves toward the upper side. In the following description, the side (+D2 side) to which the arrow of the D2 axis in the diagram in the second direction D2 points is referred to as "one side of the second direction", and the opposite side (-D2 side) to which the arrow of the D2 axis points is referred to as "the other side of the second direction". The one side of the second direction is the upper side and the rear side, and the other side of the second direction is the lower side and the front side (+X side). The connecting rib 37a is located at a position separated from the second direction side of the connecting rib 37b.

[0057] The ends of the pair of connecting ribs 37a, 37b on one side (+D1 side) of the first direction are respectively connected to the two edges of the through portion 35h in the circumferential direction θ2 in the outer side surface of the bearing holding portion 35c. The ends of the pair of connecting ribs 37a, 37b on the other side (-D1 side) of the first direction are respectively connected to the outer side surface of the holding tube portion 36. The ends of the pair of connecting ribs 37a, 37b on one side (+Y side) of the axial direction are located closer to the other side (-Y side) of the axial direction than the ends of the bearing holding portion 35c on one side and the ends of the holding tube portion 36 on one side.

[0058] In the present embodiment, the housing 30 has a groove 39 that is recessed in the axial direction and extends in the first direction D1. In the present embodiment, the groove 39 is provided on a surface on one axial side (+Y side) of the cover portion 30f in the gear housing 32. The groove 39 is recessed toward the other axial side (-Y side) and is open on one axial side. The groove 39 is open to the interior of the housing 30. In more detail, the groove 39 is open to the interior of the gear housing 32. The groove 39 is connected to the interior of the bearing retaining portion 35c. In more detail, the end of the groove 39 on one side (+D1 side) of the first direction is connected to the interior of the bearing retaining portion 35c.

[0059] In this embodiment, the groove 39 is composed of a groove 37c located between a pair of connecting ribs 37a and 37b in the second direction D2 and a through portion 35h as a groove. The groove 37c is open on one axial side (+Y side) and extends along the first direction D1. The end of the groove 37c on one first direction side (+D1 side) is connected to the through portion 35h.

[0060] The groove 39 has a groove bottom surface 39a facing one axial side (+Y side). The groove bottom surface 39a is a portion of the inner surface of the groove 39 located on the other axial side (-Y side). The groove bottom surface 39a extends along the first direction D1. The groove bottom surface 39a is located at a position closer to the axial side than the surface on the axial side of the support portion 35g. A step surface 39b is connected to the end of the groove bottom surface 39a on the first direction side (+D1 side). The step surface 39b faces one side of the first direction. The step surface 39b extends from the end of the groove bottom surface 39a on the first direction side to the other axial side. The end of the step surface 39b on the other axial side is connected to the portion of the inner surface of the through-portion 35i located on the other axial side. Thus, a step portion 39c having a step surface 39b is provided between the groove bottom surface 39a and the portion of the inner surface of the through-portion 35i located on the other axial side in the first direction D1. In the present embodiment, the portion of the inner surface of the through-portion 35i located on the other axial side is the surface of the opposing wall portion 35j on one axial side. The step surface 39b is opposed to the interior of the through-portion 35i in the first direction D1. The portion of the step surface 39b on the other axial side is opposed to the gap G in the first direction D1 via the interior of the through-portion 35i.

[0061] like Figure 1 As shown, the drive device 100 has a first flow path portion 40 extending in the axial direction. The first flow path portion 40 is a flow path portion that constitutes a part of the flow path 90 described later. The oil O flows inside the first flow path portion 40. The first flow path portion 40 is located inside the gear housing 32. Figure 2 As shown, when viewed in the axial direction, the first flow path portion 40 is located outside the bearing holding portion 35c. In the present embodiment, the first flow path portion 40 is located at a position closer to the front side (+X side) than the bearing holding portion 35c. In the present embodiment, the first flow path portion 40 is located at a position closer to the upper side than the intermediate axis J2.

[0062] like Figure 1 As shown, the first flow path portion 40 has an extension portion 41 extending in the axial direction. In the present embodiment, the extension portion 41 is a tubular component extending in the axial direction. The extension portion 41 is a substantially cylindrical tube. The extension portion 41 is located inside the gear housing 32. The end portion of the extension portion 41 on one axial side (+Y side) is supported by the partition wall portion 33. In the present embodiment, the first flow path portion 40 is composed only of the extension portion 41. Figure 4 As shown, the extension portion 41 has a main body portion 41 a , a connecting portion 41 b and a flange portion 41 c .

[0063] The main body 41a is substantially cylindrical and extends in the axial direction. A supply hole 41d is provided in the main body 41a. The supply hole 41d is a hole that penetrates the wall portion constituting the main body 41a from the inner surface to the outer surface of the main body 41a. The supply hole 41d opens inside the gear housing 32. That is, the first flow path portion 40 is provided with a supply hole 41d that opens inside the housing 30. Figure 4 As shown, in this embodiment, the supply hole 41d opens on the rear side (-X side). A plurality of supply holes 41d are provided at intervals in the axial direction. The number of supply holes 41d is not particularly limited. Only one supply hole 41d may be provided.

[0064] like Figure 4 As shown, the connection portion 41b is connected to the end of the other axial side (-Y side) of the main body 41a. The end of the other axial side of the connection portion 41b is the end of the other axial side of the extension portion 41. The connection portion 41b is roughly cylindrical and opens on the other axial side. The outer diameter of the connection portion 41b is smaller than the outer diameter of the main body 41a. The inner diameter of the connection portion 41b is smaller than the inner diameter of the main body 41a. The connection portion 41b is inserted into the interior of the retaining cylinder 36 from one axial side (+Y side). In the present embodiment, the connection portion 41b is embedded in the interior of the retaining cylinder 36, that is, in the through portion 36a. The connection portion 41b is, for example, pressed into the through portion 36a.

[0065] The flange portion 41c is provided on the outer peripheral surface of the end portion on the other axial side (-Y side) of the main body portion 41a. The flange portion 41c protrudes radially outwardly with the central axis of the roughly cylindrical main body portion 41a as the center. The flange portion 41c is in the shape of a ring surrounding the main body portion 41a. The flange portion 41c is in the shape of a plate with the plate surface facing the axial direction. The flange portion 41c is opposite to the end portion on the axial side (+Y side) of the retaining cylinder portion 36. In the present embodiment, the flange portion 41c is in contact with the end portion on the axial side of the retaining cylinder portion 36. Therefore, it is possible to appropriately suppress the oil O from leaking from the flange portion 41c and the retaining cylinder portion 36 in the axial direction. In addition, a sealing component such as an O-ring may also be provided between the flange portion 41c and the retaining cylinder portion 36. Thus, it is possible to more appropriately suppress the oil O from leaking from the flange portion 41c and the retaining cylinder portion 36 in the axial direction.

[0066] In addition, the flange portion 41c may be separated from the end portion on one axial side (+Y side) of the retaining tube portion 36 to one axial side. In this case, even when the extension portion 41 is subjected to an impact from the outside, it is difficult for the extension portion 41 to receive a force from the housing 30. Therefore, the stress generated in the extension portion 41 can be reduced, and deformation of the extension portion 41 can be suppressed.

[0067] The flow path cross-sectional area of ​​the portion of the first flow path portion 40 connected to the second flow path portion 50 described later is smaller than the flow path cross-sectional area of ​​the portion of the first flow path portion 40 provided with the supply hole 41d. Therefore, it is easy to increase the pressure of the oil O inside the portion of the first flow path portion 40 provided with the supply hole 41d. As a result, it is easy to make the oil O spray violently from the supply hole 41d. Therefore, it is easy to supply the oil O to the gear mechanism 20 from the supply hole 41d. In the present embodiment, the portion of the first flow path portion 40 connected to the second flow path portion 50 described later is the end portion on the other axial side (-Y side) of the connecting portion 41b, and is the opening portion 41e that opens on the other axial side. The opening portion 41e is the end portion on the other axial side of the first flow path portion 40. The portion of the first flow path portion 40 provided with the supply hole 41d is the main body portion 41a.

[0068] In the present embodiment, since the connection portion 41b is pressed into the retaining cylinder portion 36, the oil O is unlikely to leak from between the connection portion 41b and the retaining cylinder portion 36, and the flow rate of the oil O flowing in the second flow path portion 50 described later connected to the connection portion 41b is unlikely to decrease. As a result, it is easy to more appropriately maintain the flow rate of the oil O inside the main body portion 41a, and it is possible to more appropriately and easily cause the oil O to be strongly ejected from the supply hole 41d.

[0069] In the present embodiment, the drive device 100 has a second flow path portion 50 extending along the first direction D1. The second flow path portion 50 is a flow path portion that constitutes a part of the flow path 90 described later. The second flow path portion 50 is provided on the cover portion 30f of the gear cover 30c. The second flow path portion 50 is connected to the first flow path portion 40. The oil O flowing in from the end portion on the other axial side (-Y side) of the first flow path portion 40 flows into the interior of the second flow path portion 50.

[0070] In this embodiment, the second flow path portion 50 extends from the end portion of the other axial side (-Y side) of the first flow path portion 40 to one side (+D1 side) of the first direction and is connected to the inside of the bearing holding portion 35c. That is, when viewed along the axial direction, the second flow path portion 50 is connected from the outside of the bearing holding portion 35c to the inside of the bearing holding portion 35c. Figure 3 As shown, the second flow path portion 50 is located at the lower side as it moves from the first flow path portion 40 toward the inside of the bearing holding portion 35c. Therefore, the oil O that flows from the first flow path portion 40 into the second flow path portion 50 can be easily flowed in the second flow path portion 50 by gravity, and the oil O can be easily transported from the second flow path portion 50 to the bearing holding portion 35c.

[0071] The second flow path portion 50 is located on the lower side as it goes toward the rear side (−X side).

[0072] The second flow path portion 50 is composed of at least a portion of the hole portion 70. The hole portion 70 extends along the first direction D1. The hole portion 70 opens on the outer surface of the housing 30, connecting the interior of the housing 30 with the interior of the bearing retaining portion 35c. That is, the housing 30 has a hole portion 70 extending from the outer surface of the housing 30 to the interior of the bearing retaining portion 35c. In this way, the second flow path portion 50 connecting the interior of the first flow path portion 40 with the interior of the bearing retaining portion 35c is not a groove that opens on one side (+Y side) in the axial direction, such as the groove 39, but is composed of at least a portion of the hole portion 70, thereby appropriately suppressing the oil O from leaking from the second flow path portion 50 to one side in the axial direction. As a result, it is possible to suppress the supply of oil O from the second flow path portion 50 to the bearing retaining portion 35c from becoming insufficient. Therefore, it is possible to suppress the lubrication of the bearing 25c held in the bearing retaining portion 35c from becoming insufficient.

[0073] like Figure 4 As shown, the hole portion 70 includes a first hole portion 71 and a second hole portion 72. The first hole portion 71 opens on the outer surface of the housing 30. More specifically, the end of the first hole portion 71 on the other side (-D1 side) in the first direction opens on the other side in the first direction. That is, the end of the first hole portion 71 on the other side in the first direction is an opening end portion 70d that opens on the outer surface of the housing 30. In this embodiment, the opening end portion 70d opens on the radially outer side surface of the third peripheral wall portion 30g.

[0074] like Figure 2 As shown, in this embodiment, the opening end 70d is located above the middle axis J2 in the vertical direction. Therefore, it is easy to make the second flow path 50 a structure located at the lower side as it moves toward the bearing holding portion 35c. As a result, the oil O can be easily flowed in the second flow path 50 by gravity, and the oil O can be easily and appropriately transported from the second flow path 50 to the bearing holding portion 35c. Figure 5 As shown, in this embodiment, when viewed along the first direction D1, the first hole portion 71 is circular. In addition, the first hole portion 71 may be in a shape other than a circular shape, such as a polygonal shape, when viewed along the first direction D1. The peripheral edge of the portion of the third peripheral wall portion 30g where the opening end 70d of the first hole portion 71 is provided becomes an annular wall portion 30h protruding toward the other side (-D1 side) in the first direction. The annular wall portion 30h is substantially annular.

[0075] like Figure 2As shown, the opening end 70d is located at the front side (+X side) of the middle axis J2 in the front-to-back direction (X-axis direction). Thus, the opening end 70d is located on the side opposite to the side where the differential axis J3 is located in the front-to-back direction relative to the middle axis J2. Therefore, it is easy to open the opening end 70d in the wall portion of the wall portion constituting the housing 30 that is close to the bearing retaining portion 35c in the front-to-back direction. In the present embodiment, the opening end 70d can be opened in the front side portion of the outer surface of the third peripheral wall portion 30g. Thus, it is easy to shorten the length of the hole portion 70, thereby making it easy to manufacture the hole portion 70. In addition, it is easy to arrange the first flow path portion 40 connected to the second flow path portion 50 constituted by a part of the hole portion 70 at a position that does not overlap with the differential device 22 when viewed in the axial direction. Therefore, it is possible to suppress the first flow path portion 40 from contacting the differential device 22, and the first flow path portion 40 can be easily set.

[0076] like Figure 5 As shown, the interior of the retaining cylinder 36, i.e., the through portion 36a, is connected to the first hole portion 71. The end of the through portion 36a on the other axial side (-Y side) is opened in a portion of the inner surface of the first hole portion 71 located on one axial side (+Y side). The inner surface of the first hole portion 71 has a bottom surface 71a located on one side (+D1 side) of the first direction. The bottom surface 71a faces the other side (-D1 side) of the first direction. Figure 4 As shown, the bottom surface 71a is a substantially conical surface whose outer diameter decreases as it moves toward one side of the first direction. The first hole portion 71 is made, for example, by performing hole processing using a drill from the outside of the housing 30. In addition, the first hole portion 71 can be made by other mechanical processing, or by a processing method other than mechanical processing such as casting. In addition, the bottom surface 71a may not be substantially conical. The bottom surface 71a may also be a surface perpendicular to the first direction D1, for example.

[0077] The end of the first hole portion 71 on the other side (-D1 side) in the first direction, that is, the opening end 70d of the hole portion 70 that opens on the outer surface of the housing 30, is closed by the sealing member 60. That is, the driving device 100 includes the sealing member 60 that closes the opening end 70d of the hole portion 70 that opens on the outer surface of the housing 30. Therefore, it is possible to suppress the oil O from leaking from the opening end 70d of the hole portion 70 that opens on the outer surface of the housing 30. Thus, the second flow path portion 50 can be formed by the hole portion 70 that is easy to process, and it is possible to suppress the oil O in the second flow path portion 50 from leaking to the outside of the housing 30. Therefore, it is possible to further suppress the oil O flowing in the second flow path portion 50 from leaking.

[0078] In the present embodiment, the sealing component 60 is a plug component screwed into the first hole portion 71. The sealing component 60 has a main body portion 61 located in the first hole portion 71 and a head portion 62 connected to the end portion of the main body portion 61 on the other side of the first direction (-D1 side). The main body portion 61 is screwed into the first hole portion 71. The main body portion 61 is roughly cylindrical centered on an axis extending along the first direction D1. A threaded portion 61a is provided on the outer peripheral surface of the main body portion 61 to engage with a threaded portion 71b provided on the inner peripheral surface of the first hole portion 71. The head portion 62 protrudes radially outwardly centered on the central axis of the main body portion 61 than the end portion of the main body portion 61 on the other side of the first direction. The head portion 62 contacts the surface of the annular wall portion 30h on the other side of the first direction.

[0079] The second hole portion 72 is connected to one side (+D1 side) of the first direction of the first hole portion 71. The second hole portion 72 extends along the first direction D1. The second hole portion 72 extends from the bottom surface 71a of the first hole portion 71 to one side of the first direction, and is connected to the inside of the bearing retaining portion 35c. In the present embodiment, the end of the second hole portion 72 on one side of the first direction is connected to the through portion 35i. The second hole portion 72 is connected to the axial gap G between the bearing 25c and the opposing wall portion 35j via the through portion 35i. The size of the second hole portion 72 in the first direction D1 is larger than the size of the first hole portion 71 in the first direction D1. The second hole portion 72 is circular when viewed along the first direction D1. In addition, the second hole portion 72 may be a shape other than a circular shape, such as a polygonal shape, when viewed along the first direction D1. The inner diameter of the second hole portion 72 is smaller than the inner diameter of the first hole portion 71.

[0080] In the cross section perpendicular to the first direction D1, the cross-sectional area of ​​the second hole portion 72 is smaller than the cross-sectional area of ​​the first hole portion 71. In other words, in the cross section perpendicular to the first direction D1, the cross-sectional area of ​​the first hole portion 71 is larger than the cross-sectional area of ​​the second hole portion 72. Therefore, the first hole portion 71 opened on the outer surface of the housing 30 can be made larger than the second hole portion 72. As a result, it is possible to prevent the opening area of ​​the opening end portion 70d from becoming too small, and it is possible to prevent the opening end portion 70d from being difficult to close using the sealing member 60. In addition, it is possible to easily reduce the cross-sectional area of ​​the second hole portion 72 connected to the bearing retaining portion 35c, and it is easy to reduce the flow path cross-sectional area of ​​the portion of the second flow path portion 50 connected to the bearing retaining portion 35c. As a result, it is easy to increase the flow rate of the oil O when it is supplied to the second flow path portion 50, and it is easy to appropriately supply the oil O in a wide range inside the bearing retaining portion 35c.

[0081] In the present embodiment, the center of the circular second hole portion 72 is offset in the axial direction relative to the center of the circular first hole portion 71. The center of the second hole portion 72 is located at a position closer to the other axial side (-Y side) than the center of the first hole portion 71. The end of the second hole portion 72 on the other side (-D1 side) of the first direction is opened in a portion of the bottom surface 71a located on the other axial side. The second hole portion 72 is made, for example, by performing hole processing using a drill from the outside of the housing 30 through the inside of the first hole portion 71. The second hole portion 72 can be made by other mechanical processing, and can also be made by a processing method other than mechanical processing such as casting.

[0082] The second flow path portion 50 includes a third flow path portion 51 formed by a portion of the first hole portion 71 and a fourth flow path portion 52 formed by the second hole portion 72. The third flow path portion 51 is formed by a portion of the first hole portion 71 that is located closer to the first direction side (+D1 side) than the sealing member 60. The fourth flow path portion 52 is formed by the entirety of the second hole portion 72. In a cross section perpendicular to the first direction D1, the cross-sectional area of ​​the third flow path portion 51 is larger than the cross-sectional area of ​​the fourth flow path portion 52. The interior of the third flow path portion 51 is connected to the interior of the retaining cylinder portion 36.

[0083] The end portion of the other axial side (-Y side) of the connection portion 41b that is fitted into the retaining cylinder 36, that is, the opening portion 41e, is connected to the inside of the third flow path portion 51. Thus, the first flow path portion 40 is connected to the portion of the second flow path portion 50 that is formed by the first hole portion 71. In the cross section perpendicular to the first direction D1, the cross-sectional area of ​​the first hole portion 71 is larger than the cross-sectional area of ​​the second hole portion 72, so that the first flow path portion 40 and the second flow path portion 50 can be easily connected compared to the case where the first flow path portion 40 is connected to the portion of the second flow path portion 50 that is formed by the second hole portion 72. In addition, the first flow path portion 40 may also be connected to the portion of the second flow path portion 50 that is formed by the second hole portion 72, that is, the fourth flow path portion 52.

[0084] The fourth flow path portion 52 has a first opening portion 52a that opens inside the third flow path portion 51 and a second opening portion 52b that opens inside the bearing retaining portion 35c. The first opening portion 52a opens at a portion on the other axial side (-Y side) of the bottom surface 71a. The second opening portion 52b opens at the step surface 39b of the step portion 39c. The second opening portion 52b opens at one side (+D1 side) in the first direction. The second opening portion 52b is connected to the through portion 35i. The flow path cross-sectional area of ​​the fourth flow path portion 52 is smaller than the flow path cross-sectional area of ​​the third flow path portion 51.

[0085] In the present embodiment, the second flow path portion 50 is provided in the wall portion of the cover portion 30f located on the other axial side (-Y side) of the groove 39. Thus, in the present embodiment, the groove 39 and the second flow path portion 50 overlap in the axial direction. Here, the groove 39 opens inside the housing 30, so that a part of the oil O inside the housing 30 sometimes enters the inside of the groove 39. Specifically, a part of the oil O supplied to the inside of the gear housing 32 from the supply hole 41d of the extension portion 41 and a part of the oil O lifted from the inside of the second reservoir P2 by the gear mechanism 20 sometimes enter the inside of the groove 39. The groove 39 is connected to the inside of the bearing retaining portion 35c, so at least a part of the oil O entering the groove 39 is easily supplied to the inside of the bearing retaining portion 35c. In this way, in the present embodiment, in addition to being able to supply the oil O from the inside of the second flow path portion 50 to the inside of the bearing retaining portion 35c, the oil O can also be supplied from the inside of the groove 39 to the inside of the bearing retaining portion 35c. Therefore, it is possible to further suppress the oil O from being insufficiently supplied to the bearing holding portion 35c, and it is possible to further suppress the bearing 25c held by the bearing holding portion 35c from being insufficiently lubricated. In addition, for example, when a hole or the like connected to the inside of the connecting portion 41b is provided on the outer surface of the connecting portion 41b, and a through portion connecting the hole and the groove 39 is provided in the holding cylinder portion 36, the oil O can flow from the inside of the connecting portion 41b into the groove 39. In this case, the oil O can be more appropriately supplied to the groove 39.

[0086] In this embodiment, the fourth flow path portion 52 in the second flow path portion 50 overlaps with the groove 39 in the axial direction. Figure 3 As shown, when viewed in the axial direction, the portion of the second flow path portion 50 that overlaps with the groove 39, that is, the dimension of the fourth flow path portion 52 in the second direction D2 is smaller than the dimension of the groove 39 in the second direction D2. In the present embodiment, the entirety of the fourth flow path portion 52, except for the end portion on the other side (-D1 side) in the first direction, overlaps with the groove 39 in the axial direction.

[0087] like Figure 4As shown, the flow path cross-sectional area at the opening 41e, which is the part connected to the second flow path 50 in the first flow path 40, and the flow path cross-sectional area at the second opening 52b, which is the part connected to the inside of the bearing holding part 35c in the second flow path 50, are the same. Therefore, it is easy to make the flow rate of the oil O when flowing from the first flow path 40 into the second flow path 50 and the flow rate of the oil O when flowing from the second flow path 50 into the bearing holding part 35c the same. Thus, it is easy to suppress the flow rate of the oil O from being supplied from the first flow path 40 to the second flow path 50 until it flows into the bearing holding part 35c. Therefore, it is easy to stably supply the oil O to the bearing holding part 35c. In addition, it is easy to make the opening 41e and the second opening 52b have the same size and the same shape. Thus, compared with the case where the size and shape of the opening 41e and the second opening 52b are different from each other, it is easy to make the opening 41e and the second opening 52b.

[0088] like Figure 1 As shown, the drive device 100 has a flow path 90 through which oil O as a fluid flows. The flow path 90 is a path for supplying oil O from the second reservoir P2 to the motor 10 and the gear mechanism 20. A pump 81 and a cooler 82 are provided in the middle of the flow path 90. The pump 81 and the cooler 82 are mounted on the outer surface of the housing 30. The flow path 90 has a suction flow path portion 91, a first connecting flow path portion 92, a second connecting flow path portion 93, a supply flow path portion 94, a first flow path portion 40, a second flow path portion 50, a third connecting flow path portion 97, and a discharge flow path portion 99.

[0089] The suction flow path portion 91 connects the interior of the second storage portion P2 to the pump 81. The first connecting flow path portion 92 connects the pump 81 to the cooler 82. The second connecting flow path portion 93 connects the cooler 82 to the supply flow path portion 94. The second connecting flow path portion 93 is provided in the motor cover 30b. The second connecting flow path portion 93 is connected to the interior of the motor shaft 11a via the interior of the bearing holding portion 34a.

[0090] The supply flow path portion 94 is located inside the motor housing 31. In the present embodiment, the supply flow path portion 94 is composed of a tubular component extending in the axial direction. The supply flow path portion 94 is, for example, a roughly cylindrical tube extending in the axial direction. The supply flow path portion 94 has a supply hole 94a that opens inside the motor housing 31. A plurality of supply holes 94a are arranged at intervals in the axial direction. The end portion on the other axial side (-Y side) of the supply flow path portion 94 is connected to the end portion on one axial side (+Y side) of the first flow path portion 40 via a hole provided in the partition wall portion 33. The end portion on one axial side of the first flow path portion 40 is the end portion on one axial side of the extension portion 41.

[0091] The third connecting flow path 97 connects the interior of the bearing holding portion 35c with the interior of the bearing holding portion 35a. The discharge flow path 99 connects the interior of the bearing holding portion 35a with the interior of the second reservoir P2. Figure 2 As shown, in this embodiment, when viewed in the axial direction, the third connecting flow path portion 97 and the discharge flow path portion 99 extend in a direction inclined relative to both the up-down direction and the front-back direction. The third connecting flow path portion 97 extends from the inside of the bearing holding portion 35c to the lower side and the front side (+X side), and is connected to the inside of the bearing holding portion 35a. The discharge flow path portion 99 extends from the inside of the bearing holding portion 35a to the rear side (-X side) and the lower side, and is connected to the inside of the second reservoir P2.

[0092] like Figure 1 As shown, when the pump 81 is driven, the oil O stored in the second reservoir P2 is sucked into the suction flow path portion 91, and flows into the cooler 82 through the first connecting flow path portion 92. The oil O that has flowed into the cooler 82 is cooled in the cooler 82, and then flows into the second connecting flow path portion 93. A portion of the oil O that has flowed into the second connecting flow path portion 93 flows into the motor shaft 11a through the inside of the bearing holding portion 34a. The oil O that has flowed into the motor shaft 11a is supplied to the stator 12 from the hole portion 11c through the inside of the rotor core 11b. The remaining portion of the oil O that has flowed into the second connecting flow path portion 93 flows into the supply flow path portion 94. A portion of the oil O that has flowed into the supply flow path portion 94 is supplied toward the stator 12 from the supply hole 94a. The oil O supplied to the stator 12 from the inside of the motor shaft 11a and the oil O supplied to the stator 12 from the supply hole 94a fall downward and accumulate in the first reservoir P1. A part of the oil O accumulated in the first reservoir P1 returns to the second reservoir P2 via the partition wall opening 33 a provided in the partition wall portion 33 .

[0093] The remaining portion of the oil O that has flowed into the supply flow path portion 94 flows into the first flow path portion 40 from the end portion on one axial side (+Y side) of the first flow path portion 40. The oil O that has flowed into the first flow path portion 40 flows toward the other axial side (-Y side) in the first flow path portion 40. A portion of the oil O that has flowed into the first flow path portion 40 is supplied to the gear mechanism 20 from the supply hole 41d. Thus, the oil O can be properly supplied to the gear mechanism 20. The remaining portion of the oil O that has flowed into the first flow path portion 40 flows into the second flow path portion 50. As shown in FIG. Figure 4As shown, the oil O flowing into the second flow path portion 50 flows from the third flow path portion 51 into the fourth flow path portion 52 via the first opening portion 52a. The oil O flowing into the fourth flow path portion 52 flows toward one side (+D1 side) of the first direction and flows into the interior of the bearing retaining portion 35c. At least a portion of the oil O flowing into the bearing retaining portion 35c flows into the axial gap G between the opposing wall portion 35j and the bearing 25c via the through portion 35i. Thus, the oil O is supplied to the bearing 25c. Figure 1 As shown, at least a portion of the oil O that has flowed into the bearing holding portion 35c flows into the bearing holding portion 35a through the third connecting flow path portion 97. Thus, the oil O is supplied to the bearing 25a. At least a portion of the oil O that has flowed into the bearing holding portion 35a returns to the interior of the second reservoir P2 through the discharge flow path portion 99.

[0094] Hereinafter, an embodiment different from the above-described embodiment will be described. In the description of each embodiment below, for the same structure as that described in the portion above the description of each embodiment, the description is sometimes omitted by appropriately marking the same reference numerals, etc. In addition, for the parts corresponding to the parts of the structure described in the portion above the description of each embodiment, the same name is marked and different reference numerals are marked, and the points different from the above-described structure are described, and the description of the points identical to the above-described structure is sometimes omitted. In addition, as a structure omitted from description in each of the following embodiments, within the scope of non-contradiction, a structure identical to that described in the portion above the description of each embodiment can be adopted.

[0095] <Second embodiment>

[0096] like Figure 6 As shown, in the housing 230 of the drive device 200 of the present embodiment, the cross-sectional area of ​​the cross section of the hole portion 270 perpendicular to the first direction D1 is the same throughout the first direction D1. The opening end 270d of the hole portion 270 that opens on the outer surface of the housing 230 is closed by the sealing member 260. The opening end 270d is opened on the surface of the outer surface of the gear housing 232 that faces the other side (-D1 side) of the first direction. The sealing member 260 has the same structure as the sealing member 60 of the first embodiment except that the outer diameter is smaller than that of the sealing member 60 of the first embodiment. In the present embodiment, the through portion 236a provided in the retaining cylinder 36 extends to the other side (-Y side) of the axial direction than the retaining cylinder 36 and is connected to the hole portion 270. The second flow path portion 250 is composed of the portion of the hole portion 270 other than the portion closed by the sealing member 260. In the present embodiment, the flow path cross-sectional area of ​​the second flow path portion 250 is the same throughout the first direction D1.

[0097] The axial dimension of the connection portion 241b in the extension portion 241 of the first flow path portion 240 is larger than that of the connection portion 41b of the first embodiment. The end portion of the connection portion 241b on the other axial side (-Y side), that is, the end portion of the extension portion 241 on the other axial side, that is, the opening portion 241e, is a portion of the first flow path portion 240 connected to the second flow path portion 250. The opening portion 241e is connected to a portion of the second flow path portion 250 that is located closer to one side (+D1 side) of the first direction than the end portion on the other side (-D1 side) of the first direction. In this embodiment, the flow path cross-sectional area of ​​the connection portion 241b is the same as the flow path cross-sectional area of ​​the second flow path portion 250.

[0098] In the present embodiment, the flow path cross-sectional area from the opening 241e, which is a portion of the first flow path 240 connected to the second flow path 250, to the portion of the second flow path 250 connected to the inside of the bearing holder 35c is constant. Therefore, it is easy to make the flow rate of the oil O constant from the inside of the first flow path 240 to the inside of the second flow path 250 to the inside of the bearing holder 35c. Thus, the oil O can be stably supplied to the inside of the bearing holder 35c. The other structures of the drive device 200 are the same as those of the drive device 100 in the first embodiment.

[0099] <Third embodiment>

[0100] like Figure 7 As shown, in the drive device 300 of the present embodiment, a plurality of second flow path portions 350 are provided. In the present embodiment, the second flow path portion 350 is provided with two flow path portions, the second flow path portion 350a and the second flow path portion 50 in the first embodiment. The second flow path portion 350a extends in a direction different from the second flow path portion 50. The direction in which the second flow path portion 350a extends is a direction perpendicular to the axial direction, and is a direction intersecting both the up-down direction and the front-back direction (X-axis direction). The direction in which the second flow path portion 350a extends is a direction located on the lower side as it moves toward the rear side (-X side). The inclination of the direction in which the second flow path portion 350a extends relative to the up-down direction is less than the inclination of the direction in which the second flow path portion 50 extends relative to the up-down direction.

[0101] The second flow path portion 350a is connected to the second flow path portion 50. That is, in the present embodiment, the plurality of second flow paths 350 include two second flow paths 350a and 50 connected to each other. The second flow path portion 350a is connected to a portion of the second flow path portion 50 that is connected to the first flow path portion 40. That is, the first flow path portion 40 is connected to a portion where the two second flow paths 350a and 50 are connected to each other. Therefore, the oil O can be supplied from one first flow path portion 40 to the two second flow paths 350a and 50. Thus, compared with the case where a plurality of first flow paths 40 are provided, the complexity of the structure of the flow path in the drive device 300 can be suppressed.

[0102] The second flow path portion 350a is connected to the inside of the bearing holding portion 35a. That is, in the present embodiment, the plurality of second flow paths 350a, 50 are connected to the inside of different bearing holding portions 35a, 35c. Therefore, the oil O can be appropriately supplied to the different bearing holding portions 35a, 35c. Thus, in the present embodiment, a plurality of bearing holding portions connected to the second flow path portion 350 are provided.

[0103] The second flow path portion 350a is formed by at least a part of the hole portion 370. The opening end portion 370d of the hole portion 370 that opens on the outer surface of the housing 330 is closed by the sealing member 360. The sealing member 360 has the same structure as the sealing member 60 except that the closed opening end portion is different. The opening end portion 370d is located at a position higher than the opening end portion 70d of the hole portion 70 and at a position on the rear side (-X side). The opening end portion 370d is located at a position on the front side (+X side) than the axis passing through the bearing holding portion 35a connected to the second flow path portion 350a, that is, the center axis J1 and the intermediate axis J2. Therefore, in the present embodiment, the opening ends 370d, 70d of the plurality of hole portions 370, 70 are located on the side opposite to the side where the differential axis J3 is located in the front-rear direction relative to the axis passing through the bearing holding portion 35a, 35c connected to the second flow path portion 350a, 50 respectively formed by each hole portion 370, 70. Therefore, it is easy to make each opening end 370d, 70d open in the wall portion of the wall portion constituting the housing 330 close to each bearing holding portion 35a, 35c in the front-rear direction. As a result, the length of each hole portion 370, 70 can be easily shortened, so that each hole portion 370, 70 can be easily manufactured. In addition, the first flow path portion 40 connected to the plurality of second flow path portions 350a, 50 respectively constituted by a part of each hole portion 370, 70 can be easily arranged at a position that does not overlap with the differential device 22 when viewed in the axial direction. Therefore, even if a plurality of second flow path portions 350 are provided, it is possible to suppress the first flow path portion 40 from contacting the differential device 22, so that the first flow path portion 40 can be easily provided.

[0104] In the present embodiment, the third connecting flow path portion 397 is different from the third connecting flow path portion 97 of the first embodiment, and connects the interior of the bearing holding portion 35a with the interior of the bearing holding portion 35e. The third connecting flow path portion 397 extends slightly inclined in the upward and downward directions relative to the front-back direction. The third connecting flow path portion 397 is located on the lower side as it moves from the interior of the bearing holding portion 35a toward the interior of the bearing holding portion 35e. At least a portion of the oil O that flows from the second flow path portion 350a into the bearing holding portion 35a is provided to the bearing holding portion 35e. Thus, the oil O can be provided as lubricating oil to the bearing 25e held in the bearing holding portion 35e. Although not shown in the figure, in the present embodiment, the discharge flow path portion 99, for example, connects the interior of the bearing holding portion 35e with the interior of the second storage portion P2. The other structures of the drive device 300 are the same as the other structures of the drive device 100 in the first embodiment.

[0105] <Fourth embodiment>

[0106] like Figure 8 As shown, in the drive device 400 of the present embodiment, a plurality of second flow path portions 450 are provided. In the present embodiment, the second flow path portion 450 is provided with two flow path portions, a second flow path portion 450a and a second flow path portion 450b. The second flow path portion 450a is connected to the inside of the bearing holding portion 35e. The second flow path portion 450b is connected to the inside of the bearing holding portion 35c. The second flow path portion 450a extends from the inside of the bearing holding portion 35e to the upper side and the front side (+X side). The second flow path portion 450b extends from the inside of the bearing holding portion 35c to the upper side and the rear side (-X side). The second flow path portion 450a and the second flow path portion 450b are connected to each other. The position of the front-to-back direction (X-axis direction) of the portion where the second flow path portion 450a and the second flow path portion 450b are connected to each other is between the position of the front-to-back direction of the intermediate axis J2 and the position of the front-to-back direction of the differential axis J3. The portion where the second flow path portion 450a and the second flow path portion 450b are connected to each other is located above the intermediate axis J2 and the differential axis J3. The first flow path portion 440 is connected to the portion where the second flow path portion 450a and the second flow path portion 450b are connected to each other. The first flow path portion 440 is located above the gear ring 22a. The first flow path portion 440 has the same structure as the first flow path portion 40 of the first embodiment except that the position in the front-to-back direction and the position in the up-down direction are different.

[0107] The second flow path portion 450a is constituted by at least a portion of the hole portion 470a. An opening end portion 470c of the hole portion 470a that opens to the outer surface of the housing 430 is closed by the sealing member 460a. The second flow path portion 450b is constituted by at least a portion of the hole portion 470b. An opening end portion 470d of the hole portion 470b that opens to the outer surface of the housing 430 is closed by the sealing member 460b. The sealing members 460a and 460b have the same structure as the sealing member 60 of the first embodiment except that the opening ends to be closed are different.

[0108] In the present embodiment, each opening end 470c, 470d of each hole portion 470a, 470b opens on the upper surface of the outer surface of the gear housing 432. Each opening end 470c, 470d is located at the rear side (-X side) of the intermediate axis J2 and at the front side (+X side) of the differential axis J3. The opening end 470d of the hole portion 470b is located at the rear side and the lower side of the opening end 470c of the hole portion 470a.

[0109] In the present embodiment, the differential axis J3 and the open ends 470c, 470d are located at the rear side (-X side) of the intermediate axis J2. Therefore, it is easy to arrange the first flow path portion 440 connected to the second flow path portion 450a, 450b between the intermediate axis J2 and the differential axis J3 in the front-to-back direction. Therefore, compared with the case where the first flow path portion 440 is arranged at the front side (+X side) of the intermediate axis J2, it is easy to suppress the enlargement of the drive device 400 in the front-to-back direction. The other structures of the drive device 400 are the same as those of the drive device 100 in the first embodiment.

[0110] <Fifth Embodiment>

[0111] like Fig. 9 As shown, in the drive device 500 of the present embodiment, two second flow path portions 50, 550 are connected inside the bearing holding portion 35c. Therefore, the oil O can be appropriately provided from the two second flow path portions 50, 550 to the bearing holding portion 35c. The second flow path portion 550 extends in a direction different from the second flow path portion 50. The direction in which the second flow path portion 550 extends is a direction perpendicular to the axial direction, and is a direction that intersects both the up-down direction and the front-back direction (X-axis direction). The direction in which the second flow path portion 550 extends is a direction that is located on the lower side as it moves toward the rear side (-X side). The inclination of the direction in which the second flow path portion 550 extends relative to the up-down direction is less than the inclination of the direction in which the second flow path portion 50 extends relative to the up-down direction. The second flow path portion 550 is located at a position higher than the second flow path portion 50.

[0112] The second flow path portion 550 is formed by at least a portion of the hole portion 570. An opening end portion 570d of the hole portion 570 that opens to the outer surface of the housing 530 is closed by the sealing member 560. The opening end portion 570d opens to a portion located on the upper side of the outer surface of the gear housing 532. The sealing member 560 has the same structure as the sealing member 60 of the first embodiment except that the opening end portion that is closed is different.

[0113] The drive device 500 includes a first flow path portion 540 in addition to the first flow path portion 40. The end portion of the first flow path portion 540 on the other axial side (-Y side) is connected to the second flow path portion 550. The first flow path portion 540 is located at a position closer to the rear side (-X side) and the upper side than the first flow path portion 40. The first flow path portion 540 has the same structure as the first flow path portion 40 except that the position in the front-to-back direction and the position in the up-down direction are different. The other structures of the drive device 500 are the same as those of the drive device 100 in the first embodiment.

[0114] The present invention is not limited to the above-mentioned embodiments, and other structures and other methods can also be adopted within the scope of the technical concept of the present invention. As long as the first flow path portion extends in the axial direction, it can be any structure. The first flow path portion can also be composed of a hole provided in the housing. The number of the first flow path portion can be more than one, and there is no special limitation.

[0115] The intersecting direction in which the second flow path portion extends can be any direction as long as it is a direction intersecting with the axial direction. In the case where a plurality of second flow path portions are provided, the plurality of second flow path portions may also include two or more second flow path portions connected to each other. In this case, the first flow path portion may also be connected to a portion of the two or more second flow path portions connected to each other. In addition, in this case, the first flow path portion may also be connected to a portion of a second flow path portion that is different from a portion of the two or more second flow path portions connected to each other. In this case, the plurality of second flow path portions may also include a second flow path portion connected to the first flow path portion via other second flow path portions. The number of second flow path portions may be one or more, and is not particularly limited.

[0116] The fluid flowing in the first flow path and the second flow path is not particularly limited and may be a fluid other than oil. The fluid supplied from the second flow path to the bearing holder may be, for example, a refrigerant flowing from the bearing holder to other components of the drive device to cool the other components.

[0117] The bearing holding portion connected to the second flow path portion can be any bearing holding portion as long as it holds a bearing that supports at least a part of the gear mechanism so that it can rotate. The bearing holding portion connected to the second flow path portion can also include, for example, one or more of the bearing holding portions 35a, 35b, 35c, 35d, and 35e in the first embodiment described above. The sealing component that closes the opening end of the hole portion constituting the second flow path portion that opens on the outer surface of the housing can be of any structure as long as it closes the opening end.

[0118] The hole portion constituting the second flow path portion may not open on the outer surface of the housing. In this case, the hole portion is a hole extending from the inside of the bearing holding portion in a direction intersecting the axial direction and having a bottom at the front end portion. In this case, since the opening end portion opening on the outer surface of the housing is not provided, a sealing component is not required. In this case, the hole portion is made by, for example, performing hole processing from the inside of the bearing holding portion.

[0119] The use of the drive device to which the present invention is applied is not particularly limited. The drive device may be mounted on a vehicle for a purpose other than rotating an axle, or may be mounted on a device other than a vehicle. The central axis of the motor may extend in any direction.

[0120] In addition, the present technology can adopt the following structures.

[0121] (1) A drive device comprising: a motor having a rotor that can rotate around a central axis; a gear mechanism connected to the rotor; a bearing that supports at least a portion of the gear mechanism so that it can rotate; a housing having a bearing retaining portion that retains the bearing, the housing accommodating the motor and the gear mechanism internally; a first flow path portion that extends in an axial direction; a second flow path portion that is connected to the first flow path portion and extends in a cross direction that intersects the axial direction; and a sealing component, the housing having a hole portion that extends from an outer surface of the housing to an interior of the bearing retaining portion, the second flow path portion being composed of at least a portion of the hole portion and being connected to the interior of the bearing retaining portion, an opening end of the hole portion that opens on the outer surface of the housing being closed by the sealing component.

[0122] (2) The drive device according to (1), wherein a portion of the gear mechanism supported by the bearing is rotatable about an axis extending in the axial direction, and the open end portion is located above the axis in the up-down direction.

[0123] (3) A drive device according to (1) or (2), wherein the gear mechanism comprises: a reduction gear connected to the rotor; and a differential device connected to the reduction gear, the reduction gear having a gear rotatable around an axis extending axially and passing through the bearing retaining portion, the differential device having a gear rotatable around a differential axis extending axially, the differential axis being located on one side of a vertical direction perpendicular to both the axial direction and the up and down directions than the axis, and the opening end being located on the other side of the vertical direction than the axis.

[0124] (4) A drive device according to (1) or (2), wherein the gear mechanism comprises: a reduction gear connected to the rotor; and a differential device connected to the reduction gear, the reduction gear having a gear rotatable around an axis extending axially and passing through the bearing retaining portion, the differential device having a gear rotatable around a differential axis extending axially, and the differential axis and the open end portion are located on one side of the axis in a direction perpendicular to both the axial direction and the up and down directions.

[0125] (5) The drive device according to any one of (1) to (4), wherein the bearing retaining portion is provided in plurality, the second flow path portion is provided in plurality, and the plurality of second flow path portions are connected to the interiors of different bearing retaining portions.

[0126] (6) The drive device according to any one of (1) to (4), wherein a plurality of the second flow path portions are provided, and two or more of the second flow path portions are connected inside the bearing holding portion.

[0127] (7) The driving device according to (5), wherein the plurality of second flow path portions include two or more second flow path portions connected to each other, and portions where the two or more second flow path portions are connected to each other are connected to the first flow path portion.

[0128] (8) A drive device according to any one of (1) to (7), wherein a flow path cross-sectional area of ​​a portion of the first flow path portion connected to the second flow path portion and a flow path cross-sectional area of ​​a portion of the second flow path portion connected to the interior of the bearing retaining portion are the same as each other.

[0129] (9) A driving device according to any one of (1) to (8), wherein a supply hole opening inside the housing is provided in the first flow path portion, and a flow path cross-sectional area of ​​a portion of the first flow path portion connected to the second flow path portion is smaller than a flow path cross-sectional area of ​​a portion of the first flow path portion in which the supply hole is provided.

[0130] (10) A drive device according to any one of (1) to (9), wherein the hole portion comprises: a first hole portion which opens on the outer surface of the housing; and a second hole portion which is connected to the interior of the bearing retaining portion, wherein in a cross section perpendicular to the intersection direction, a cross-sectional area of ​​the first hole portion is larger than a cross-sectional area of ​​the second hole portion, and a portion of the second flow path portion formed by the first hole portion is connected to the first flow path portion.

[0131] (11) A drive device according to any one of (1) to (10), wherein the housing has an axially recessed groove extending along the cross direction, the groove opens inside the housing, is connected to the inside of the bearing retaining portion, and overlaps with the second flow path portion in the axial direction.

[0132] The structures and methods described above in this specification can be appropriately combined within a range that does not contradict each other.

Claims

1. A driving device, characterized in that: The drive device has: A motor having a rotor rotatable about a central axis; a gear mechanism connected to the rotor; a bearing that rotatably supports at least a portion of the gear mechanism; a housing having a bearing holding portion for holding the bearing, the housing accommodating the motor and the gear mechanism; A first flow path portion extending in the axial direction; a second flow path portion connected to the first flow path portion and extending along a cross direction intersecting the axial direction; as well as Sealing parts, The housing has a hole extending from an outer surface of the housing to the inside of the bearing holding portion, The second flow path portion is formed by at least a portion of the hole portion and is connected to the interior of the bearing holding portion. An opening end of the hole portion that opens to the outer surface of the housing is closed by the sealing member.

2. The driving device according to claim 1, characterized in that: The portion of the gear mechanism supported by the bearing is rotatable about an axis extending in the axial direction. The opening end portion is located above the axis in the up-down direction.

3. The driving device according to claim 1, characterized in that: The gear mechanism has: a reduction gear connected to the rotor; and a differential device connected to the reduction gear, The reduction gear has a gear rotatable about an axis extending in the axial direction and passing through the bearing holding portion. The differential device has a gear rotatable about a differential axis extending in the axial direction. The differential axis is located on one side of the axis in a direction perpendicular to both the axial direction and the up-down direction. The opening end is located on the other side of the axis in the vertical direction.

4. The driving device according to claim 1, characterized in that: The gear mechanism has: a reduction gear connected to the rotor; and a differential device connected to the reduction gear, The reduction gear has a gear rotatable about an axis extending in the axial direction and passing through the bearing holding portion. The differential device has a gear rotatable about a differential axis extending in the axial direction. The differential axis and the open end are located on one side of the axis in a perpendicular direction perpendicular to both the axial direction and the up-down direction.

5. The driving device according to claim 1, characterized in that: The bearing holding portion is provided with a plurality of The second flow path portion is provided with a plurality of The plurality of second flow path portions are connected to different interiors of the bearing holding portions.

6. The driving device according to claim 1, characterized in that: The second flow path portion is provided with a plurality of Two or more of the second flow path portions are connected to the inside of the bearing holding portion.

7. The driving device according to claim 5, characterized in that: The plurality of second flow path portions include two or more second flow path portions connected to each other, Parts where the two or more second flow path portions are connected to each other are connected to the first flow path portion.

8. The driving device according to claim 1, characterized in that: A flow path cross-sectional area of ​​a portion of the first flow path portion connected to the second flow path portion and a flow path cross-sectional area of ​​a portion of the second flow path portion connected to the interior of the bearing holding portion are identical to each other.

9. The driving device according to claim 1, characterized in that: The first flow path portion is provided with a supply hole opening inside the housing, A portion of the first flow path portion connected to the second flow path portion has a flow path cross-sectional area smaller than a portion of the first flow path portion where the supply hole is provided.

10. The driving device according to claim 1, characterized in that: The hole portion has: a first hole portion that opens on an outer surface of the housing; and a second hole portion connected to the interior of the bearing holding portion, In a cross section perpendicular to the intersecting direction, the cross-sectional area of ​​the first hole portion is larger than the cross-sectional area of ​​the second hole portion, A portion of the second flow path portion formed by the first hole portion is connected to the first flow path portion.

11. The driving device according to any one of claims 1 to 10, characterized in that: The housing has a groove recessed in the axial direction, the groove extending along the cross direction, The groove opens inside the housing, is connected to the inside of the bearing holding portion, and overlaps with the second flow path portion in the axial direction.

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