TWI797895B - Rotating Motors and Drives - Google Patents

Abstract

The invention provides a rotating electric machine and a driving device. The rotary electric machine has: a rotor rotatable about a center axis extending in the axial direction; a stator having a stator core located radially outside of the rotor; a case housing the rotor and the stator inside; and a bearing, It supports the rotor rotatably. The housing has: a cover wall portion located on one axial side of the stator; a peripheral wall portion surrounding the stator and extending from a radially outer peripheral portion of the cover wall portion to the other axial side; a bearing holding portion provided on the cover wall a portion holding the bearing inside; and a rib provided on the surface on the other axial side of the cover wall portion to connect the bearing holding portion and the peripheral wall portion. The peripheral wall portion has a stator fixing portion for fixing the stator core. The ribs include the first rib. When viewed in the axial direction, the first rib extends from the bearing holding portion toward the stator fixing portion in a direction inclined with respect to a radial direction centered on the central axis.

Description

Rotating Motors and Drives

The invention relates to a rotating electrical machine and a driving device.

Conventionally, various countermeasures against vibration of rotating electric machines are known. For example, Patent Document 1 discloses a method of reducing an excitation force for exciting vibration. [Prior Art Literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2007-166710

[Problem to be Solved by the Invention]

In a rotary electric machine, torsional resonance may occur in which the stator core vibrates in a direction twisted around the central axis. When this torsional resonance occurs, the entire rotating electrical machine tends to vibrate, and therefore there is a problem that the noise generated by the rotating electrical machine tends to increase. Therefore, it is required to further reduce noise.

In view of the above circumstances, one object of the present invention is to provide a rotating electric machine and a drive device having a structure capable of reducing noise. [Means to solve the problem]

One aspect of the present invention is a rotary electric machine including: a rotor rotatable about a center axis extending in the axial direction; a stator having a stator core located radially outside of the rotor; The rotor and the stator are housed inside, and a bearing rotatably supports the rotor. The housing has: a cover wall part, which is located on one axial side of the stator; a peripheral wall part, which surrounds the stator, and extends from the radially outer peripheral edge part of the cover wall part to the other axial side, and the bearing a holding portion provided on the cover wall portion to hold the bearing inside; and a rib provided on the surface on the other side in the axial direction of the cover wall portion to connect the bearing holding portion and the peripheral wall part connected. The peripheral wall portion has a stator fixing portion for fixing the stator core. The ribs include a first rib. The first rib extends from the bearing holding portion toward the stator fixing portion in a direction inclined with respect to a radial direction centered on the central axis when viewed in the axial direction.

One aspect of the present invention is a drive device mounted on a vehicle to rotate an axle, the drive device including: the above-mentioned rotating electric machine; and a transmission device connected to the rotating electric machine to transmit the rotation of the rotor to the axle. [Effect of the invention]

According to one aspect of the present invention, noise can be reduced in the rotating electric machine and the driving device.

In the following description, the vertical direction will be defined based on the positional relationship when the drive device according to the embodiment is mounted on a vehicle located on a horizontal road surface. That is, the relative positional relationship in the vertical direction described in the following embodiments may be satisfied at least when the drive device is mounted on a vehicle located on a horizontal road surface.

In the 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 vertical direction. The +Z side is the upper side in the vertical direction, and the -Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is simply referred to as "upper side", and the lower side in the vertical direction is simply referred to as "lower side". The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-rear direction of the vehicle on which the drive device is mounted. In the following embodiments, the +X side is the front side of the vehicle, and the −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 +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions perpendicular to the vertical direction.

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 right side of the vehicle, and the -Y side is the left side of the vehicle. In addition, in this specification, a "parallel direction" also includes a substantially parallel direction, and a "perpendicular direction" also includes a substantially perpendicular direction.

The central axis J shown appropriately is an imaginary axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends along the Y-axis direction perpendicular to the vertical direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as "axial", the radial direction centered on the central axis J is simply referred to as "radial", and the direction centered on the central axis J is simply referred to as "radial". The circumferential direction, that is, the direction around the central axis J is referred to as "circumferential direction" for short. In the present embodiment, the left side (+Y side) corresponds to “one side in the axial direction”, and the right side (−Y side) corresponds to the “other side in the axial direction”.

The appropriately illustrated arrow θ indicates the circumferential direction. In the following description, the side in the circumferential direction that advances clockwise around the central axis J when viewed from the right side, that is, the side (+θ side) toward which the arrow θ is directed, is referred to as the "circumferential side", and The side that advances counterclockwise around the central axis J when viewed from the right in the circumferential direction, that is, the side (-θ side) opposite to the side to which the arrow θ points is referred to as “the other side in the circumferential direction”.

A drive device 100 according to the present embodiment shown in FIG. 1 is a drive device mounted on a vehicle to rotate an axle 64 . The vehicle on which the drive device 100 is mounted is a vehicle using a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid vehicle (PHV), and an electric vehicle (EV). As shown in FIG. 1 , the drive device 100 has a rotary electric machine 10 and a transmission device 60 . The transmission device 60 is connected to the rotary electric machine 10 and transmits the rotation of the rotary electric machine 10 , that is, the rotation of the rotor 30 described later, to an axle 64 of the vehicle. The transmission device 60 of this embodiment has a gear housing 61 , a speed reduction device 62 connected to the rotary electric machine 10 , and a differential device 63 connected to the speed reduction device 62 .

The gear case 61 accommodates the speed reduction device 62 , the differential device 63 and the oil O therein. Oil O is stored in a lower area inside the gear housing 61 . The oil O circulates in the refrigerant passage 90 described later. Oil O is used as a refrigerant for cooling the rotary electric machine 10 . In addition, the oil O is used as lubricating oil for the speed reduction device 62 and the differential device 63 . As the oil O, for example, an oil equivalent to automatic transmission fluid (ATF: Automatic Transmission Fluid) with a relatively low viscosity is preferably used so as to function as a refrigerant and a lubricating oil.

The differential device 63 has a ring gear 63a. Torque output from the rotary electric machine 10 is transmitted to the ring gear 63 a via the reduction gear 62 . The lower end of the ring gear 63 a is immersed in the oil O stored in the gear housing 61 . As the ring gear 63a rotates, the oil O is lifted up. The lifted oil O is supplied to the speed reduction device 62 and the differential device 63 as lubricating oil, for example.

The rotary electric machine 10 is a part that drives the driving device 100 . The rotary electric machine 10 is located, for example, on the right side of the transmission device 60 . In this embodiment, the rotating electric machine 10 is a motor. The rotary electric machine 10 has a motor housing 20, a rotor 30, a stator 40, a refrigerant supply part 50, bearings 34, 35, a pump 110, and a cooler 120, wherein the rotor 30 can be rotated around a central axis J extending in the axial direction. rotate.

The rotor 30 has a shaft 31 and a rotor main body 32 . Although illustration is omitted, the rotor main body 32 has a rotor core and a rotor magnet fixed to the rotor core. The torque of the rotor 30 is transmitted to the transmission device 60 .

The shaft 31 is rotatable around the center axis J. As shown in FIG. The shaft 31 is rotatably supported by bearings 34 and 35 . Thus, the bearings 34 and 35 support the rotor 30 in a rotatable manner. The bearings 34, 35 are, for example, ball bearings. In this embodiment, the shaft 31 is a hollow shaft. The shaft 31 has a cylindrical shape extending in the axial direction around the central axis J. The shaft 31 is provided with a hole 33 connecting the inside of the shaft 31 and the outside of the shaft 31 . The shaft 31 extends across the inside of the motor housing 20 and the inside of the gear housing 61 . The left end of the shaft 31 protrudes toward the inside of the gear housing 61 . A reduction gear 62 is connected to the left end of the shaft 31 .

The stator 40 is opposed to the rotor 30 with a gap in the radial direction. More specifically, the stator 40 is located radially outside of the rotor 30 . The stator 40 is fixed inside the motor casing 20 . The stator 40 has a stator core 41 and a coil element 42 .

The stator core 41 has a ring shape surrounding the central axis J of the rotary electric machine 10 . The stator core 41 is located radially outside of the rotor 30 . The stator core 41 surrounds the rotor 30 . The stator core 41 is formed, for example, by stacking a plurality of plate members such as electromagnetic steel sheets in the axial direction.

As shown in FIG. 2 , the stator core 41 has a stator core main body 43 and protrusions 49 . The stator core main body 43 has a ring shape surrounding the rotor 30 . More specifically, the stator core main body 43 has a cylindrical shape centered on the central axis J and opened on both sides in the axial direction. The stator core main body 43 has a cylindrical outer peripheral surface surrounding the rotor 30 . In the present embodiment, the outer peripheral surface of the stator core main body 43 has a cylindrical shape centered on the central axis J. As shown in FIG. Although not shown, the stator core main body 43 has a cylindrical core back extending in the axial direction and a plurality of teeth extending radially inward from the core back.

The protruding portion 49 protrudes radially outward from the outer peripheral surface of the stator core main body 43 . The protruding portion 49 is a portion fixed to the motor housing 20 . The protrusion 49 extends in the axial direction. The protrusion 49 extends, for example, from the left end of the stator core body 43 to the right end of the stator core body 43 . The circumferential dimension of the protruding portion 49 becomes smaller as it goes radially outward. When viewed in the axial direction, the outer shape of the radially outer end of the protruding portion 49 is an arc shape protruding radially outward.

Each protruding portion 49 has a through-hole 49 a penetrating through each protruding portion 49 in the axial direction. The through hole 49a is, for example, a circular hole. A bolt 29 extending in the axial direction passes through the through hole 49a. The bolt 29 passes through the through hole 49 a from the right side (−Y side), for example, and is screwed into a female screw hole 27 e provided in the motor housing 20 . Thus, the protruding portion 49 is fixed to the motor housing 20 by the bolt 29 .

A plurality of protrusions 49 are provided at intervals in the circumferential direction. For example, four protrusions 49 are provided. The protruding portion 49 includes a first protruding portion 44 , a second protruding portion 45 , a third protruding portion 46 , and a fourth protruding portion 47 . The 1st protrusion part 44, the 2nd protrusion part 45, the 3rd protrusion part 46, and the 4th protrusion part 47 are mutually arrange|positioned at intervals in the circumferential direction. In the present embodiment, the first protruding portion 44 and the second protruding portion 45 are located above the central axis J. As shown in FIG. In the present embodiment, the third protruding portion 46 and the fourth protruding portion 47 are located below the central axis J. As shown in FIG. The first protruding portion 44 , the second protruding portion 45 , the third protruding portion 46 , and the fourth protruding portion 47 are arranged, for example, at equal intervals over the entire circumference in the circumferential direction. The 1st protrusion part 44, the 2nd protrusion part 45, the 3rd protrusion part 46, and the 4th protrusion part 47 are mutually the same shape, for example.

The first protruding portion 44 is provided at an upper end portion of the front portion of the stator core main body 43 . The first protruding portion 44 protrudes upward obliquely forward from the stator core main body 43 . The second protruding portion 45 is provided at an upper end portion of the rear portion of the stator core main body 43 . The second protruding portion 45 protrudes obliquely rearward upward from the stator core main body 43 . The third protruding portion 46 is provided at the lower end portion of the rear portion of the stator core main body 43 . The third protruding portion 46 protrudes obliquely rearward downward from the stator core main body 43 . The fourth protruding portion 47 is provided at the lower end portion of the front portion of the stator core main body 43 . The fourth protruding portion 47 protrudes obliquely forward and downward from the stator core main body 43 .

The first protruding portion 44 and the second protruding portion 45 are arranged symmetrically in the front-rear direction (X-axis direction). The third protrusions 46 and the fourth protrusions 47 are arranged symmetrically in the front-rear direction (X-axis direction). The first protrusions 44 and the fourth protrusions 47 are arranged symmetrically in the vertical direction (Z-axis direction). The second protrusions 45 and the third protrusions 46 are symmetrically arranged in the vertical direction (Z-axis direction).

As shown in FIG. 1 , the coil element 42 has a plurality of coils 42c attached to the stator core 41 along the circumferential direction. The plurality of coils 42c are attached to the respective teeth of the stator core 41 via an insulator (not shown). The plurality of coils 42c are arranged along the circumferential direction. More specifically, the plurality of coils 42c are arranged at regular intervals over the entire circumference along the circumferential direction. Although illustration is omitted, the coil element 42 may have a binding member etc. which bind each coil 42c, and may have the overlapping wire which connects each coil 42c mutually.

The coil element 42 has coil end portions 42a, 42b protruding from the stator core 41 in the axial direction. The coil end 42a is a portion protruding leftward from the stator core 41 . The coil end 42b is a portion protruding rightward from the stator core 41 . The coil end portion 42 a includes a portion protruding leftward from the stator core 41 among the coils 42 c included in the coil assembly 42 . The coil end portion 42 b includes a portion protruding to the right side from the stator core 41 among the coils 42 c included in the coil assembly 42 . In the present embodiment, the coil end portions 42a and 42b have an annular shape centering on the central axis J. As shown in FIG. Although illustration is omitted, the coil ends 42a and 42b may include binding members or the like for binding the coils 42c, or may include overlapping wires connecting the coils 42c to each other.

The motor casing 20 is a casing that accommodates the rotor 30 and the stator 40 therein. The motor housing 20 is connected to the right side of the gear housing 61 . The motor housing 20 has a peripheral wall portion 21 , a cover wall portion 22 , and a cover member 23 . The peripheral wall portion 21 and the cover wall portion 22 are, for example, part of the same single member. The cover member 23 is, for example, a separate body from the peripheral wall portion 21 and the cover wall portion 22 .

The cover wall portion 22 is located on the left side (+Y side) of the stator 40 . The cover wall portion 22 expands in the radial direction. The cover wall portion 22 partitions the inside of the motor housing 20 and the inside of the gear housing 61 in the axial direction. The cover wall portion 22 has a through hole 22b through which the shaft 31 passes. The through hole 22 b connects the inside of the motor housing 20 and the inside of the gear housing 61 .

The cover wall portion 22 has an opening 22 a connecting the inside of the motor housing 20 and the inside of the gear housing 61 . As shown in FIG. 3 , the opening 22 a has a substantially quadrangular shape when viewed in the axial direction. The opening 22 a is provided at a lower end portion of the cover wall portion 22 . In the present embodiment, the opening 22 a is located on the front side (+X side) of the central axis J. As shown in FIG.

As shown in FIG. 1 , the peripheral wall portion 21 has a cylindrical shape that surrounds the central axis J and opens on the right side. The peripheral wall portion 21 extends to the right side (−Y side) from the radially outer peripheral edge portion of the cover wall portion 22 . The peripheral wall portion 21 surrounds the stator 40 . A stator core main body 43 is fitted on the radially inner side of the peripheral wall portion 21 .

As shown in FIGS. 3 and 4 , the peripheral wall portion 21 has a stator fixing portion 27 . In the present embodiment, the stator fixing portion 27 is a surface facing the right side (−Y side). The stator fixing portion 27 is, for example, a flat surface perpendicular to the axial direction. As shown in FIG. 4 , the stator fixing portion 27 is formed by providing a recess 21 a recessed radially outward from the inner peripheral surface of the peripheral wall portion 21 . The concave portion 21a extends in the axial direction. The right end of the recessed portion 21a is open. The end portion on the left side (+Y side) of the recessed portion 21 a is arranged away from the cover wall portion 22 to the right side. The stator fixing portion 27 is a surface located on the left side among the inner surfaces of the recessed portion 21 a.

In the present embodiment, the stator fixing portion 27 protrudes radially outward from the inner peripheral surface of the peripheral wall portion 21 . The circumferential dimension of the stator fixing portion 27 becomes smaller as it goes radially outward. When viewed in the axial direction, the outer shape of the radially outer end portion of the stator fixing portion 27 is an arc shape protruding radially outward. The shape of the stator fixing portion 27 is the same as that of the left end surface of the protruding portion 49 . The left end surface of the protruding portion 49 is in contact with the stator fixing portion 27 .

The stator fixing portion 27 is provided with a female screw hole 27 e that is recessed toward the left side (+Y side) from the stator fixing portion 27 . The bolt 29 inserted into the through-hole 49a of the protruding portion 49 is screwed into the internally threaded hole 27e. The protruding portion 49 is fixed to the stator fixing portion 27 by the bolt 29 . Thus, the stator core 41 is fixed to the stator fixing portion 27 by the bolts 29 .

As shown in FIG. 3 , in this embodiment, a plurality of stator fixing portions 27 are provided at intervals in the circumferential direction. For example, four stator fixing parts 27 are provided. The stator fixing portion 27 includes a first stator fixing portion 27a, a second stator fixing portion 27b, a third stator fixing portion 27c, and a fourth stator fixing portion 27d. The 1st stator fixing part 27a, the 2nd stator fixing part 27b, the 3rd stator fixing part 27c, and the 4th stator fixing part 27d are mutually arrange|positioned at intervals along the circumferential direction. In the present embodiment, the first stator fixing portion 27a and the second stator fixing portion 27b are positioned above the central axis J. As shown in FIG. In the present embodiment, the third stator fixing portion 27c and the fourth stator fixing portion 27d are located below the central axis J. As shown in FIG. The 1st stator fixing part 27a, the 2nd stator fixing part 27b, the 3rd stator fixing part 27c, and the 4th stator fixing part 27d are arrange|positioned at equal intervals over the whole circumference of a circumferential direction, for example. The 1st stator fixing part 27a, the 2nd stator fixing part 27b, the 3rd stator fixing part 27c, and the 4th stator fixing part 27d are mutually the same shape, for example.

The first stator fixing portion 27 a is provided at an upper end portion of the front portion of the inner peripheral surface of the peripheral wall portion 21 . The first stator fixing portion 27 a protrudes obliquely forward upward from the inner peripheral surface of the peripheral wall portion 21 . The second stator fixing portion 27 b is provided at an upper end portion of the rear portion of the inner peripheral surface of the peripheral wall portion 21 . The second stator fixing portion 27b protrudes obliquely and rearward upward from the inner peripheral surface of the peripheral wall portion 21 . The third stator fixing portion 27c is provided at the lower end portion of the rear portion of the inner peripheral surface of the peripheral wall portion 21 . The third stator fixing portion 27 c protrudes obliquely and rearward downward from the inner peripheral surface of the peripheral wall portion 21 . The fourth stator fixing portion 27d is provided at the lower end portion of the front portion of the inner peripheral surface of the peripheral wall portion 21 . The fourth stator fixing portion 27d protrudes obliquely forward downward from the inner peripheral surface of the peripheral wall portion 21 .

The first stator fixing portion 27 a and the second stator fixing portion 27 b are arranged symmetrically in the front-rear direction (X-axis direction). The third stator fixing portion 27c and the fourth stator fixing portion 27d are arranged symmetrically in the front-rear direction (X-axis direction). The first stator fixing portion 27a and the fourth stator fixing portion 27d are arranged symmetrically in the vertical direction (Z-axis direction). The second stator fixing portion 27b and the third stator fixing portion 27c are arranged symmetrically in the vertical direction (Z-axis direction).

The first protruding portion 44 is fixed to the first stator fixing portion 27a. The second protruding portion 45 is fixed to the second stator fixing portion 27b. The third protruding portion 46 is fixed to the third stator fixing portion 27c. The fourth protruding portion 47 is fixed to the fourth stator fixing portion 27d.

As shown in FIG. 1 , the cover member 23 is fixed to the right (−Y side) end of the peripheral wall portion 21 . The cover member 23 closes the opening on the right side of the peripheral wall portion 21 . A bearing 35 is held on the cover member 23 .

As shown in FIG. 3 , the motor housing 20 has a bearing holding portion 28 . The bearing holding portion 28 is provided on the cover wall portion 22 . As shown in FIGS. 4 and 5 , in the present embodiment, the bearing holding portion 28 protrudes to the right side (−Y side) from the cover wall portion 22 . The bearing holding portion 28 has a cylindrical shape centered on the central axis J. As shown in FIG. The inside of the bearing holding portion 28 constitutes a part of the inside of the through hole 22b. The bearing holding portion 28 holds the bearing 34 inside. As shown in FIG. 3 , the bearing holding portion 28 has a hole portion 28 a. The hole portion 28a penetrates through the wall portion in the upper end portion of the bearing holding portion 28 in the vertical direction. The hole portion 28a opens on the right side (-Y side).

The motor housing 20 has ribs 70 . The rib 70 is provided on the right side (−Y side) surface of the cover wall portion 22 . The rib 70 connects the bearing holding portion 28 and the peripheral wall portion 21 . More specifically, as shown in FIG. 4 , the rib 70 connects the outer peripheral surface of the bearing holding portion 28 and the portion of the inner peripheral surface of the peripheral wall portion 21 that is away from the stator fixing portion 27 to the left (+Y side). In the present embodiment, the rib 70 has a plate shape protruding rightward from the right side surface of the cover wall portion 22 . The plate surface of the rib 70 faces, for example, a direction perpendicular to the axial direction. In the present embodiment, the rib 70 extends linearly when viewed in the axial direction. The rib 70, the peripheral wall portion 21, and the cover wall portion 22 are, for example, part of the same single member.

As shown in FIG. 3 , the rib 70 includes a first rib 71 and a second rib 72 . The first rib 71 extends from the bearing holding portion 28 toward the stator fixing portion 27 in a direction inclined with respect to the radial direction centering on the central axis J when viewed in the axial direction. In addition, in this specification, "the first rib extends in a direction inclined relative to the radial direction from the bearing holding part toward the stator fixing part when viewed in the axial direction" means that the first rib 71 extends along the It extends in a direction inclined with respect to the radial direction connecting the radially inner end portion connected to the bearing holding portion of the first rib and the central axis J.

In this embodiment, a plurality of first ribs 71 are provided. The plurality of first ribs 71 includes a first rib group 71 s composed of two or more first ribs 71 and provided for each stator fixing portion 27 . In the present embodiment, four first rib groups 71 s are provided at equal intervals over the entire circumference along the circumferential direction. Each first rib group 71s extends toward each stator fixing portion 27 when viewed in the axial direction. Each of the first rib groups 71s is composed of, for example, four first ribs 71 . In this embodiment, each 1st rib group 71s contains a pair of 1st rib 71a, 71b and a pair of 1st rib 71c, 71d, respectively.

The pair of first ribs 71a and 71b intersect each other when viewed in the axial direction. That is, in the present embodiment, the plurality of first ribs 71 includes first ribs 71 a and 71 b intersecting each other. The pair of first ribs 71a and 71b are arranged in an X shape when viewed in the axial direction. The first rib 71 a is located on one side (+θ side) in the circumferential direction as it goes radially outward from the bearing holding portion 28 . The first rib 71 b is located on the other side (−θ side) in the circumferential direction as it goes radially outward from the bearing holding portion 28 . The radially outer end of the first rib 71 a is connected to a portion of the inner peripheral surface of the peripheral wall portion 21 at the same circumferential position as that of the end of the stator fixing portion 27 on one side in the circumferential direction. The radially outer end of the first rib 71b is connected to a portion of the inner peripheral surface of the peripheral wall portion 21 at the same circumferential position as the end of the stator fixing portion 27 on the other circumferential side.

A pair of 1st rib 71c, 71d pinches a pair of 1st rib 71a, 71b along the circumferential direction. The 1st rib 71c is located in the circumferential direction side (+(theta) side) of a pair of 1st rib 71a, 71b. The first rib 71d is located on the other side (-θ side) in the circumferential direction of the pair of first ribs 71a, 71b. In each first rib group 71s, the first rib 71c and the first rib 71d extend in directions parallel to each other. In this embodiment, a pair of 1st rib 71c, 71d extends along the radial direction which connects the part where the 1st rib 71a and the 1st rib 71b intersect, and the central axis J. As shown in FIG.

The first rib 71 c is located on the other side (−θ side) in the circumferential direction as it goes radially outward from the bearing holding portion 28 . The first rib 71 d is located on one side (+θ side) in the circumferential direction as it goes radially outward from the bearing holding portion 28 . The radially outer end of the first rib 71 c is connected to a portion of the inner peripheral surface of the peripheral wall portion 21 at the same circumferential position as that of the end of the stator fixing portion 27 on one side in the circumferential direction. The radially outer end portion of the first rib 71d is connected to a portion of the inner peripheral surface of the peripheral wall portion 21 at the same circumferential position as that of the end portion on the other circumferential side of the stator fixing portion 27 . The radial end portions of the pair of first ribs 71c and 71d are, for example, arranged slightly apart from the radial end portions of the pair of first ribs 71a and 71b in the circumferential direction. In addition, the radially outer ends of the pair of first ribs 71c and 71d may be connected to the radially outer ends of the pair of first ribs 71a and 71b, respectively. The radially inner ends of the pair of first ribs 71c and 71d may be connected to the radially inner ends of the pair of first ribs 71a and 71b, respectively.

In this embodiment, a plurality of second ribs 72 are provided. At least one second rib 72 is arranged between stator fixing portions 27 adjacent in the circumferential direction when viewed in the axial direction. At least one of the plurality of second ribs 72 is arranged between the first rib groups 71 s adjacent in the circumferential direction. When viewed in the axial direction, the second rib 72 extends from the bearing holding portion 28 toward a portion of the peripheral wall portion 21 whose circumferential position is different from that of the stator fixing portion 27 . In the present embodiment, the second rib 72 extends radially from the bearing holding portion 28 toward the peripheral wall portion 21 .

The second rib 72 includes a pair of second ribs 72a, 72b. A pair of second ribs 72a, 72b is located between the first rib group 71s extending toward the first stator fixing portion 27a when viewed in the axial direction and the first rib group 71s extending toward the second stator fixing portion 27b when viewed in the axial direction. between. The second rib 72a is located away from the second rib 72b on the circumferential side (+θ side). A pair of second ribs 72a and 72b extend upward from portions located on both sides in the circumferential direction of the hole portion 28a in the bearing holding portion 28 . A pair of 2nd rib 72a, 72b extends in the direction which isolate|separates from each other in the circumferential direction as it goes radially outward (upper side).

The second rib 72 includes a second rib 72c, a second rib 72d, and a second rib 72e. The second rib 72c is located between the first rib group 71s extending toward the second stator fixing portion 27b when viewed in the axial direction and the first rib group 71s extending toward the third stator fixing portion 27c when viewed in the axial direction. The second rib 72d is located between the first rib group 71s extending toward the third stator fixing portion 27c when viewed in the axial direction and the first rib group 71s extending toward the fourth stator fixing portion 27d when viewed in the axial direction. The second rib 72e is located between the first rib group 71s extending toward the fourth stator fixing portion 27d when viewed in the axial direction and the first rib group 71s extending toward the first stator fixing portion 27a when viewed in the axial direction. The second rib 72c and the second rib 72e extend in the front-back direction (X-axis direction). The second rib 72d extends downward from the bearing holding portion 28 .

As shown in FIG. 5 , in this embodiment, each rib 70 has a first connection portion 74 a and a second connection portion 74 b. That is, the first rib 71 and the second rib 72 each have a first connecting portion 74a and a second connecting portion 74b.

The first connecting portion 74 a is connected to the bearing holding portion 28 . More specifically, the radially inner end portion of the first connection portion 74 a is connected to the outer peripheral surface of the bearing holding portion 28 . The end portion on the right side (−Y side) of the first connection portion 74 a is located on the left side (+Y side) as it goes radially outward. The radially inner end of the right end of the first connection portion 74 a is connected to the right end of the bearing holding portion 28 . The axial position of the radially inner end of the right end of the first connecting portion 74 a is the same as the axial position of the right end of the bearing holding portion 28 .

The second connection portion 74b is located radially outward from the first connection portion 74a. In this embodiment, the second connection portion 74b is connected to the radially outer side of the first connection portion 74a. The second connection portion 74b is connected to the peripheral wall portion 21 . More specifically, the radial outer end portion of the second connection portion 74 b is continuous with the inner peripheral surface of the peripheral wall portion 21 . The dimension of the extension direction of the 2nd connection part 74b is larger than the dimension of the extension direction of the 1st connection part 74a. The right (−Y side) end of the second connection portion 74 b is located on the left side (+Y side) of the first connection portion 74 a on the right side. The right end portion of the second connection portion 74 b is located on the left side of the right end portion of the bearing holding portion 28 .

Thus, in the present embodiment, the right (−Y side) end of the rib 70 (that is, the right end of the first rib 71 and the right end of the second rib 72 ) is positioned at a lower position than the bearing holding portion 28 . The end of the right side is closer to the left side (+Y side), or the end of the right side (-Y side) of the rib 70 (that is, the right end of the first rib 71 and the right end of the second rib 72). The axial position is the same as the axial position of the right end of the bearing holding portion 28 . The coil end part 42a is arrange|positioned facing the right side of the 2nd connection part 74b. The left end portion of the coil end portion 42a is located on the left side of the right end portion of the first connection portion 74a. The coil end portion 42 a surrounds the right end portion of the first connection portion 74 a and the right end portion of the bearing holding portion 28 .

As shown in FIG. 3 , the motor casing 20 has a casing flow path portion 24 , a pump mounting portion 25 , and a cooler mounting portion 26 . The casing flow path portion 24 is a portion through which oil O as a fluid flows inside. In the present embodiment, the housing flow path portion 24 protrudes radially outward from the peripheral wall portion 21 . More specifically, the housing flow path portion 24 protrudes toward the front side (+X side) from the front portion of the peripheral wall portion 21 . A first stator fixing portion 27 a and a fourth stator fixing portion 27 d are provided on the front portion of the peripheral wall portion 21 that is connected to the case flow path portion 24 . In the present embodiment, the case flow path portion 24 extends in the vertical direction.

In addition, in this specification, "a certain stator fixing part is provided in a part connected to a certain object in the peripheral wall part" includes at least a part of a certain stator fixing part located inside the peripheral wall part and a certain part when viewed in the axial direction. between objects.

The pump mounting part 25 is a part where the pump 110 is mounted. In the present embodiment, the pump mounting portion 25 protrudes downward from the lower portion of the peripheral wall portion 21 . The pump mounting part 25 has a mounting hole part 25a. As shown in FIG. 1 , the mounting hole portion 25 a is recessed to the left side (+Y side) from the surface on the right side (−Y side) of the pump mounting portion 25 . The mounting hole portion 25a is a hole having a bottom on the left side. The pump 110 is inserted into the mounting hole 25a from the right side. In the present embodiment, the left (+Y side) end of the pump mounting portion 25 is connected to the gear housing 61 . As shown in FIG. 3 , a third stator fixing portion 27 c and a fourth stator fixing portion 27 d are provided on the lower portion of the peripheral wall portion 21 that is connected to the pump mounting portion 25 .

The cooler mounting portion 26 is a portion where the cooler 120 is mounted. In the present embodiment, the cooler mounting portion 26 protrudes upward from the upper portion of the peripheral wall portion 21 . The front end of the cooler mounting portion 26 is connected to the upper end of the casing flow path portion 24 . A first stator fixing portion 27a and a second stator fixing portion 27b are provided on an upper portion of the peripheral wall portion 21 that continues to the cooler mounting portion 26 .

As shown in FIG. 1 , in the present embodiment, the refrigerant supply portion 50 has a tubular shape extending in the axial direction. In other words, in the present embodiment, the refrigerant supply portion 50 is a pipe extending in the axial direction. Both axial end portions of the refrigerant supply portion 50 are supported by the motor housing 20 . The left end portion of the refrigerant supply portion 50 is supported by, for example, the cover wall portion 22 . The right end portion of the refrigerant supply unit 50 is supported by, for example, the cover member 23 . The refrigerant supply part 50 is located radially outside of the stator 40 . In the present embodiment, the refrigerant supply unit 50 is located above the stator 40 . As shown in FIG. 3 , the refrigerant supply part 50 is located directly above the hole part 28a. The circumferential position of the refrigerant supply part 50 is between the circumferential position of the upper end of the second rib 72a and the circumferential position of the upper end of the second rib 72b.

As shown in FIG. 1 , the refrigerant supply unit 50 has a supply port 50 a for supplying oil O as a refrigerant to the stator 40 . In the present embodiment, the supply port 50 a is an injection port that sprays a part of the oil O that has flowed into the refrigerant supply part 50 to the outside of the refrigerant supply part 50 . A plurality of supply ports 50a are provided. The supply port 50a includes the supply port 50a which supplies the oil O to the stator core 41, and the supply port 50a which supplies the oil O to the coil end part 42a, 42b.

As shown in FIG. 3 , the refrigerant supply unit 50 has a supply port 50 b for supplying oil O to the bearing 34 . The supply port 50b is located above the hole portion 28a. The oil O discharged downward from the supply port 50b flows into the inside of the bearing holding portion 28 from the hole portion 28a. In the present embodiment, the oil O discharged from the supply port 50b flows into the hole portion 28a through the circumferential gap between the second rib 72a and the second rib 72b. The oil O discharged from the supply port 50b can be guided into the hole portion 28a by the pair of second ribs 72a and 72b.

The pump 110 pumps oil O that is a fluid flowing in the case flow path portion 24 . As shown in FIG. 1 , the pump 110 is inserted into the mounting hole portion 25 a and mounted on the pump mounting portion 25 . In the present embodiment, the pump 110 protrudes to the right side (−Y side) from the attachment hole portion 25 a. The pump 110 is, for example, an electric pump.

The cooler 120 cools oil O that is a fluid flowing in the case flow path portion 24 . In this embodiment, cooler 120 is an oil cooler. The cooler 120 is mounted on the upper side of the motor housing 20 . As shown in FIG. 3 , the cooler 120 is attached to the upper side of the cooler attachment portion 26 .

In the present embodiment, the rotating electric machine 10 has an inverter unit 80 . The inverter unit 80 has an inverter case 81 and an inverter main body 82 . The inverter main body 82 has an inverter circuit 82a. That is, the inverter unit 80 has an inverter circuit 82a. In the present embodiment, the inverter case 81 has a substantially rectangular parallelepiped box shape. The inverter case 81 accommodates an inverter main body 82 therein. That is, the inverter case 81 accommodates the inverter circuit 82a inside. The inverter case 81 has a case main body portion 81d and a cover portion 81e.

81 d of case main-body parts are formed in the substantially rectangular parallelepiped box shape opened to the upper side. In the present embodiment, the case main body portion 81 d is provided on the motor case 20 . The casing main body portion 81d and the peripheral wall portion 21 and the cover wall portion 22 in the motor housing 20 are, for example, part of the same single member. 81 d of case main body parts have the 1st wall part 81a, the 2nd wall part 81b, and the 3rd wall part 81c. That is, the inverter case 81 has the 1st wall part 81a provided in the motor case 20, the 2nd wall part 81b provided in the motor case 20, and the 3rd wall part 81c provided in the motor case 20.

The first wall portion 81 a is a wall portion positioned on the front side (+X side) among the wall portions constituting the substantially rectangular parallelepiped box-shaped casing body portion 81 d. When viewed in the axial direction, the first wall portion 81a extends in the vertical direction. The lower portion of the first wall portion 81 a constitutes an upper end portion among rear (−X side) end portions of the peripheral wall portion 21 . The second stator fixing portion 27b is provided on the first wall portion 81a. The direction in which the second stator fixing portion 27b provided on the first wall portion 81a protrudes from the inner peripheral surface of the peripheral wall portion 21 is a direction intersecting the direction in which the first wall portion 81a extends when viewed in the axial direction.

In addition, in this specification, "the direction in which a certain stator fixing portion protrudes from the inner peripheral surface of the peripheral wall portion" refers to, for example, connecting the radially outer end portion of a certain stator fixing portion and the central axis J when viewed in the axial direction. radial. In this embodiment, the direction in which the second stator fixing portion 27b protrudes from the inner peripheral surface of the peripheral wall portion 21 is toward the rear side (-X side) with respect to the vertical direction in which the first wall portion 81a extends when viewed in the axial direction. Diagonally inclined direction.

The second wall portion 81b is a wall portion located on the lower side among the wall portions constituting the substantially rectangular parallelepiped box-shaped casing body portion 81d. The second wall portion 81b extends in the front-rear direction (X-axis direction) when viewed in the axial direction. That is, when viewed in the axial direction, the second wall portion 81b extends in a direction different from that of the first wall portion 81a. In the present embodiment, the second wall portion 81b extends in a direction perpendicular to the first wall portion 81a when viewed in the axial direction. The front side portion of the second wall portion 81 b is connected to the motor housing 20 . The front end of the second wall portion 81b is connected to a portion of the peripheral wall portion 21 located between the portion provided with the second stator fixing portion 27b and the portion provided with the third stator fixing portion 27c in the circumferential direction. The dimension of the front-back direction of the 2nd wall part 81b is larger than the dimension of the vertical direction of the 1st wall part 81a. That is, when viewed in the axial direction, the dimension in the extending direction of the first wall portion 81a is smaller than the dimension in the extending direction of the second wall portion 81b.

The third wall portion 81c is a wall portion located on the rear side (−X side) among the wall portions constituting the substantially rectangular parallelepiped box-shaped casing body portion 81d. When viewed in the axial direction, the third wall portion 81c extends in the vertical direction. That is, in the present embodiment, when viewed in the axial direction, the third wall portion 81c extends in the same direction as the direction in which the first wall portion 81a extends.

The cover part 81e is separate from the case main body part 81d, for example. The cover part 81e is fixed to the upper side of the case main body part 81d. The lid portion 81e closes the upper opening of the case body portion 81d.

The inverter main body 82 is housed inside the inverter case 81 . In this embodiment, the inverter main body 82 is fixed to the lower surface of the cover part 81e. The inverter circuit 82 a of the inverter main body 82 is electrically connected to the stator 40 . Although illustration is omitted, the inverter circuit 82a is constituted by, for example, a plurality of transistors. The electric power supplied to the stator 40 is adjusted by the inverter circuit 82a.

As shown in FIG. 1 , in the present embodiment, the drive device 100 is provided with a refrigerant flow path 90 through which oil O as a refrigerant circulates. The refrigerant flow path 90 is provided across the inside of the motor housing 20 and the inside of the gear housing 61 . The refrigerant flow path 90 is a path for supplying the oil O stored in the gear housing 61 to the rotary electric machine 10 and returning it to the gear housing 61 again. A pump 110 , a cooler 120 , and a refrigerant supply unit 50 are provided in the refrigerant passage 90 . The refrigerant flow path 90 has a first flow path portion 91 , a second flow path portion 92 , a third flow path portion 93 , and a fourth flow path portion 94 .

The first flow path portion 91 , the second flow path portion 92 , the third flow path portion 93 , and the fourth flow path portion 94 are provided on the motor housing 20 , for example. The first flow path portion 91 connects the portion where the oil O is stored inside the gear housing 61 and the pump 110 . The first flow path portion 91 is provided, for example, on the pump mounting portion 25 .

The second flow path portion 92 connects the pump 110 and the cooler 120 . As shown in FIG. 3, the 2nd flow path part 92 has the 1st part 92a, the 2nd part 92b, and the 3rd part 92c. The second portion 92b is constituted by the case flow path portion 24 extending in the vertical direction. The first part 92a connects the pump 110 and the lower end of the second part 92b. The third part 92c connects the upper end of the second part 92b and the cooler 120 .

The third flow path portion 93 connects the inside of the cooler 120 and the refrigerant supply portion 50 . As shown in FIG. 1 , in the present embodiment, the third flow path portion 93 is connected to the left (+Y side) end portion of the refrigerant supply portion 50 . The fourth flow path portion 94 connects the interior of the refrigerant supply portion 50 and the interior of the shaft 31 . The fourth flow path portion 94 is provided, for example, on the cover member 23 . In the present embodiment, the fourth flow path portion 94 is connected to the end portion on the right side (−Y side) of the refrigerant supply portion 50 and the end portion on the right side of the shaft 31 .

When the pump 110 is driven, the oil O stored in the gear housing 61 is sucked into the pump 110 through the first flow path portion 91 , and flows into the cooler 120 through the second flow path portion 92 . The oil O that has flowed into cooler 120 is cooled in cooler 120 , and then flows into refrigerant supply unit 50 through third flow path portion 93 . Part of the oil O that has flowed into the refrigerant supply part 50 is sprayed from the supply ports 50 a and 50 b and supplied to the stator 40 or the bearing 34 . Another part of the oil O that has flowed into the refrigerant supply portion 50 flows into the shaft 31 through the fourth flow path portion 94 . Part of the oil O that has flowed into the shaft 31 is scattered toward the stator 40 through the inside of the rotor main body 32 from the hole portion 33 . Another part of the oil O that has flowed into the shaft 31 is discharged into the gear housing 61 from the opening on the left side of the shaft 31 and stored in the gear housing 61 again.

The oil O supplied to the stator 40 from the supply port 50 a and the oil O supplied to the stator 40 from the inside of the shaft 31 take heat from the stator 40 . The oil O having cooled the stator 40 falls downward and accumulates in the lower region of the motor casing 20 . The oil O accumulated in the lower region of the motor housing 20 returns to the gear housing 61 through the opening 22 a provided in the cover wall portion 22 . As described above, the refrigerant flow path 90 supplies the oil O stored in the gear housing 61 to the rotor 30 and the stator 40 .

According to the present embodiment, the rib 70 connecting the bearing holding portion 28 and the peripheral wall portion 21 includes the first rib 71 . The first rib 71 extends from the bearing holding portion 28 toward the stator fixing portion 27 in a direction inclined with respect to the radial direction centering on the central axis J when viewed in the axial direction. Therefore, the rigidity of the portion of the peripheral wall portion 21 where the stator fixing portion 27 is provided can be increased by the first rib 71 . Accordingly, even if torsional resonance occurs in which the stator core 41 vibrates upward in a twisted direction around the central axis J, the stator fixing portion 27 to which the stator core 41 is fixed can be suppressed from vibrating in the twisted direction around the central axis J. Therefore, it is possible to suppress vibration of the entire motor housing 20 in the torsional direction. In addition, the first rib 71 extends in a direction inclined relative to the radial direction when viewed in the axial direction. That is, the first rib 71 extends in a direction inclined in the circumferential direction with respect to the radial direction. Therefore, compared with the case where the first rib 71 extends only in the radial direction, the rigidity of the first rib 71 can be increased in the torsional direction around the center axis J. As shown in FIG. Thus, since the first rib 71 is connected to the portion of the peripheral wall portion 21 where the stator fixing portion 27 is provided, the rigidity of the portion of the peripheral wall portion 21 where the stator fixing portion 27 is provided can be further increased. Therefore, even if the above-mentioned torsional resonance occurs, the vibration of the stator fixing portion 27 in the torsional direction around the central axis J can be further suppressed. Therefore, it is possible to further suppress vibration of the entire motor housing 20 in the torsional direction. Thereby, even if the above-mentioned torsional resonance occurs, it is possible to suppress the noise generated from the rotary electric machine 10 from becoming louder. Thereby, the noise generated from the rotary electric machine 10 can be reduced. Therefore, it is also possible to reduce the noise generated from the driving device 100 provided with the rotary electric machine 10 .

In addition, according to the present embodiment, the plurality of first ribs 71 includes the first ribs 71a, 71b intersecting each other. Therefore, the rigidity of the first rib 71a and the rigidity of the first rib 71b can be further improved. Accordingly, the vibration of the stator fixing portion 27 in the torsional direction around the central axis J can be further suppressed by the first ribs 71a, 71b. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

In addition, according to the present embodiment, the plurality of first ribs 71 includes the first rib group 71s that is composed of two or more first ribs 71 and is provided for each stator fixing portion 27 . Each first rib group 71s includes a pair of first ribs 71a, 71b that intersect each other when viewed in the axial direction, and another pair of first ribs 71c, 71d that sandwich the pair of first ribs 71a, 71b in the circumferential direction. Therefore, the rigidity of each part where each stator fixing part 27 is provided in the peripheral wall part 21 can be improved more suitably by 71 s of 1st rib groups. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

In addition, according to the present embodiment, the first rib 71 has: the first connecting portion 74a, which is connected to the bearing holding portion 28; outward position. The right end portion of the second connection portion 74b is located on the left side of the right end portion of the first connection portion 74a. Therefore, the radially outer portion of the first rib 71 can be recessed to the left side, that is, to the cover wall portion 22 side. Thereby, when the coil end part 42a and the 2nd connection part 74b are arrange|positioned to oppose the axial direction like this embodiment, the coil end part 42a can be arrange|positioned close to the cover wall part 22. Therefore, even if the first rib 71 is provided, the increase in size of the motor housing 20 in the axial direction can be suppressed. On the other hand, by providing the first connecting portion 74a, the rigidity of the first rib 71 can be ensured. Therefore, by providing the first rib 71, the above-mentioned noise reduction effect can be appropriately obtained.

In addition, according to the present embodiment, the right end of the first rib 71 is located on the left side of the right end of the bearing holding portion 28, or the axial position of the right end of the first rib 71 is held by the bearing. The axial positions of the ends on the right side of the portion 28 are the same. Therefore, the first rib 71 does not protrude rightward than the bearing holding portion 28 . Thereby, interference of the first rib 71 with the rotor 30 and the stator 40 can be suppressed.

In addition, according to the present embodiment, the rib 70 includes the second rib 72 . When viewed in the axial direction, at least one second rib 72 is disposed between adjacent stator fixing portions 27 in the circumferential direction. 27 extends at different positions in the circumferential direction. Therefore, the rigidity of the peripheral wall portion 21 with respect to the torsional direction can be further enhanced by the second rib 72 . Thereby, the noise generated from the rotary electric machine 10 can be further reduced.

In addition, according to the present embodiment, the stator fixing portion 27 includes the second stator fixing portion 27 b provided on the first wall portion 81 a of the inverter case 81 . The direction in which the second stator fixing portion 27b provided on the first wall portion 81a protrudes from the inner peripheral surface of the peripheral wall portion 21 is a direction intersecting the direction in which the first wall portion 81a extends when viewed in the axial direction. Therefore, compared with the case where the direction in which the second stator fixing portion 27b protrudes from the inner peripheral surface of the peripheral wall portion 21 is the direction in which the first wall portion 81a extends when viewed in the axial direction, even if the second stator fixing portion 27b is around the Also in the case of vibrating in the torsional direction of the center axis J, the first wall portion 81 a can be made less likely to vibrate in the direction in which it falls (the front-rear direction). Accordingly, even when the above-mentioned torsional resonance occurs, vibration of the inverter case 81 can be suppressed. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

Moreover, according to this embodiment, the inverter case 81 has the 2nd wall part 81b extended in the direction different from the 1st wall part 81a when viewed in the axial direction. When viewed in the axial direction, the dimension in the extending direction of the first wall portion 81a is smaller than the dimension in the extending direction of the second wall portion 81b. Therefore, it is possible to make the length of the first wall portion 81a relatively small when viewed in the axial direction. Accordingly, even if vibration is transmitted from the second stator fixing portion 27b to the first wall portion 81a, the first wall portion 81a can be made less likely to vibrate. Therefore, even when the above-mentioned torsional resonance occurs, it is possible to further suppress the vibration of the inverter case 81 . Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

In addition, according to the present embodiment, the stator fixing portion 27 includes the first stator fixing portion 27 a and the fourth stator fixing portion 27 d provided in the portion of the peripheral wall portion 21 connected to the case flow path portion 24 . Since the thickness of the wall portion of the motor casing 20 is increased by the casing flow path portion 24 , the rigidity of the portion of the peripheral wall portion 21 connected to the casing flow path portion 24 tends to be greater than the rigidity of other portions of the peripheral wall portion 21 . . Therefore, by providing the first stator fixing portion 27a and the fourth stator fixing portion 27d in the portion of the peripheral wall portion 21 connected to the casing flow path portion 24, it is easy to improve the rigidity of the first stator fixing portion 27a and the rigidity of the fourth stator fixing portion. 27d rigidity. Accordingly, even when the above-mentioned torsional resonance occurs, the vibration of the first stator fixing portion 27 a and the fourth stator fixing portion 27 d can be further suppressed. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

In addition, according to the present embodiment, the housing flow path portion 24 protrudes radially outward from the peripheral wall portion 21 . Therefore, the casing flow path portion 24 functions as a rib, and the rigidity of a portion of the peripheral wall portion 21 connected to the casing flow path portion 24 can be increased. Thus, by providing the first stator fixing portion 27a and the fourth stator fixing portion 27d in the portion of the peripheral wall portion 21 connected to the casing flow path portion 24, the rigidity of the first stator fixing portion 27a and the fourth stator fixing portion 27a can be suitably improved. Rigidity of the stator fixing portion 27d. Therefore, even when the above-mentioned torsional resonance occurs, the vibration of the first stator fixing portion 27 a and the fourth stator fixing portion 27 d can be further suppressed. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

Moreover, according to this embodiment, the stator fixing part 27 includes the 1st stator fixing part 27a and the 2nd stator fixing part 27b provided in the part connected to the cooler attachment part 26 in the surrounding wall part 21. Since the thickness of the wall portion of the motor housing 20 is increased by the cooler attachment portion 26 , the rigidity of the portion connected to the cooler attachment portion 26 in the peripheral wall portion 21 tends to be greater than the rigidity of other portions of the peripheral wall portion 21 . . In addition, since the cooler 120 is attached, the rigidity of the cooler attachment portion 26 tends to increase. Therefore, the rigidity of the portion connected to the cooler mounting portion 26 in the peripheral wall portion 21 becomes more likely to increase. Thus, by providing the first stator fixing part 27a and the second stator fixing part 27b at the part of the peripheral wall part 21 connected to the cooler mounting part 26, it is easy to improve the rigidity of the first stator fixing part 27a and the second stator fixing part. Rigidity of part 27b. Therefore, even when the above-mentioned torsional resonance occurs, the vibration of the first stator fixing portion 27a and the second stator fixing portion 27b can be further suppressed. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

Moreover, according to this embodiment, the stator fixing part 27 includes the 3rd stator fixing part 27c and the 4th stator fixing part 27d provided in the part connected to the pump mounting part 25 in the surrounding wall part 21. Since the thickness of the wall portion of the motor housing 20 is increased by the pump mounting portion 25 , the portion of the peripheral wall portion 21 connected to the pump mounting portion 25 tends to be more rigid than other portions of the peripheral wall portion 21 . In addition, since the pump 110 is attached, the rigidity of the pump attachment portion 25 tends to increase. Therefore, the rigidity of the portion connected to the pump mounting portion 25 in the peripheral wall portion 21 becomes more likely to increase. Thus, by providing the third stator fixing part 27c and the fourth stator fixing part 27d at the part of the peripheral wall part 21 connected to the pump mounting part 25, it is easy to improve the rigidity of the third stator fixing part 27c and the rigidity of the fourth stator fixing part. 27d rigidity. Therefore, even when the above-mentioned torsional resonance occurs, the vibration of the third stator fixing portion 27c and the fourth stator fixing portion 27d can be further suppressed. Therefore, the noise generated from the rotary electric machine 10 can be further reduced.

The present invention is not limited to the above-described embodiments, and other configurations and methods can also be employed within the scope of the technical idea of the present invention. Any rib may be included as long as the rib includes at least one first rib. The number of first ribs is not particularly limited as long as it is one or more. The first rib may extend in any direction as long as it extends in a direction inclined with respect to a radial direction centering on the central axis from the bearing holding portion toward the stator fixing portion when viewed in the axial direction. The first ribs do not need to include first ribs crossing each other. When a plurality of stator fixing portions are provided, the first rib may be provided only in some stator fixing portions among the plurality of stator fixing portions. The shape of the first rib is not particularly limited. The first rib may extend in a curved shape when viewed in the axial direction. The dimension in the axial direction of the first rib may be the same as a whole. The first rib may protrude to the other side (right side) in the axial direction than the bearing holding portion. The second rib may not be provided.

The number of stator fixing parts is not particularly limited as long as it is one or more. The shape of the stator fixing portion is not particularly limited. The stator fixing portion may be provided on any part of the peripheral wall portion. The housing flow path may not be provided. The pump mounting part may not be provided. The cooler mounting part may not be provided. It is also possible not to provide an inverter unit. Any fluid may be used as the fluid flowing in the case flow path portion. The fluid may be, for example, insulating liquid or water. In the case where the fluid is water and is a refrigerant for cooling the stator, the surface of the stator may be subjected to insulation treatment.

In addition, in this specification, regarding "a certain object is arranged on other objects", it may mean that a certain object and at least a part of other objects are part of the same single part, or it may be that a certain object is separate from other objects and An object is pinned to other objects. Specifically, for example, regarding “the first wall portion is provided on the casing”, at least a part of the first wall portion and the casing may be part of the same single member, or the first wall portion and the casing may be separated and the first wall portion may be separated from the casing. 1 The wall part is fixed to the casing.

In addition, in the above-mentioned embodiment, the case body part 81d of the inverter case 81 is shown as a structure integrated with a part of the motor case 20, that is, the case body part 81d and a part of the motor case 20 are identical and single. The structure of a part of a component, but not limited to. In the above-mentioned embodiment, the whole inverter case 81 and the motor case 20 may be separated.

The rotating electric machine to which the present invention is applied is not limited to a motor, but may be a generator. The use of the rotating electric machine is not particularly limited. For example, the rotating electric machine may be mounted on a vehicle for purposes other than rotating an axle, or may be mounted on equipment other than the vehicle. The posture when using the rotating electric machine is not particularly limited. The central axis of the rotary electric machine may also extend in the vertical direction. As mentioned above, the structure demonstrated in this specification can be combined suitably within the range which does not contradict each other.

10: Rotating motor 20: Motor housing (housing) 21: Peripheral wall 22: Cover wall 24: Shell flow path part 25: Pump installation department 26: Cooler installation part 27: Stator fixed part 28: Bearing holding part 30: rotor 34: Bearing 40: Stator 41: Stator core 60: transfer device 61: gear housing 64: Axle 70: Rib 71, 71a, 71b, 71c, 71d: 1st rib 71s: 1st rib group 72, 72a, 72b, 72c, 72d, 72e: 2nd rib 74a: the first connecting part 74b: The second connecting part 80: Inverter unit 81: Inverter housing 81a: the first wall 81b: the second wall 82a: Inverter circuit 100: drive device 110: pump 120: Cooler J: central axis O: oil (fluid)

FIG. 1 is a schematic configuration diagram schematically showing a drive device according to an embodiment. FIG. 2 is a perspective view showing a stator according to one embodiment. Fig. 3 is a cross-sectional view showing a driving device according to an embodiment. FIG. 4 is a cutaway perspective view showing a part of a motor housing according to one embodiment. Fig. 5 is a cross-sectional view showing part of a rotating electrical machine according to one embodiment.

20: Motor housing (housing)

21: Peripheral wall

22: Cover wall

22a: opening

24: Shell flow path part

25: Pump installation department

25a: Mounting hole

26: Cooler installation part

27: Stator fixed part

27a: The first stator fixing part

27b: The second stator fixing part

27c: The third stator fixed part

27d: 4th stator fixed part

28: Bearing holding part

28a: Hole

50: Refrigerant supply part

50b: supply port

61: gear housing

64: Axle

70: Rib

71, 71a, 71b, 71c, 71d: 1st rib

71s: 1st rib group

72, 72a, 72b, 72c, 72d, 72e: 2nd rib

80: Inverter unit

81: Inverter housing

81a: the first wall

81b: the second wall

81c: the third wall

81d: Shell main body

81e: Cover

82:Inverter main body

82a: Inverter circuit

92: The second flow path

92a: Part 1

92b: Part 2

92c: Part 3

93: The 3rd channel part

100: drive device

110: pump

120: Cooler

J: central axis

O: oil (fluid)

Claims (13)

A rotating electrical machine comprising: a rotor rotatable about a central axis extending in the axial direction; a stator having a stator core located radially outside of the rotor; and a casing accommodating the rotor and the stator; and a bearing that rotatably supports the rotor, and the housing has: a cover wall portion located on one axial side of the stator; A radially outer peripheral edge portion of the wall portion extends to the other side in the axial direction, a bearing holding portion provided on the cover wall portion internally holds the bearing; and a rib provided on the shaft in the cover wall portion. On the other side, the bearing holding portion is connected to the peripheral wall portion, the peripheral wall portion has a stator fixing portion for fixing the stator core, the ribs include a first rib, and the first rib A plurality of the first ribs extend from the bearing holding portion toward the stator fixing portion in a direction inclined with respect to a radial direction centered on the central axis when viewed in the axial direction. The first ribs include intersecting first ribs. The rotating electric machine according to claim 1, wherein the stator fixing part is provided with a plurality of, The plurality of first ribs includes a first rib group composed of two or more first ribs and provided for each of the stator fixing parts, and each of the first rib groups includes a pair of first ribs , when viewed in the axial direction, the pair of first ribs cross each other; and another pair of first ribs sandwiches the pair of first ribs in the circumferential direction. The rotating electric machine according to claim 1, wherein the first rib has: a first connecting portion connected to the bearing holding portion; and a second connecting portion located radially closer to the first connecting portion. The outer position is connected to the peripheral wall portion, and the end portion on the other axial side of the second connecting portion is located on one side in the axial direction than the end portion on the other axial side of the first connecting portion. . The rotating electric machine according to claim 1, wherein an end portion on the other axial side of the first rib is located on one side in the axial direction than an end portion on the other axial side of the bearing holding portion, Alternatively, the axial position of the end portion on the other axial side of the first rib is the same as the axial position of the end portion on the other axial side of the bearing holding portion. The rotating electric machine according to claim 1, wherein the ribs include second ribs, and when viewed in the axial direction, between the stator fixing parts adjacent in the circumferential direction are arranged There is at least one second rib, and the second rib extends from the bearing holding portion toward a portion of the peripheral wall portion whose circumferential position is different from that of the stator fixing portion. The rotating electrical machine according to claim 1, wherein the rotating electrical machine further has an inverter unit having an inverter circuit electrically connected to the stator, the inverter unit having an inverter an inverter casing, the inverter casing accommodates the inverter circuit inside, the inverter casing has a first wall portion, the first wall portion is provided on the outer shell, and the stator is fixed The part includes a stator fixing part provided on the first wall part, and the stator fixing part protrudes radially outward from the inner peripheral surface of the peripheral wall part, and is provided on the first wall part when viewed in the axial direction. A direction in which the stator fixing portion protrudes from the inner peripheral surface of the peripheral wall portion is a direction intersecting a direction in which the first wall portion extends. The rotating electric machine according to claim 6, wherein the inverter case has a second wall portion, and when viewed in the axial direction, the second wall portion extends in a direction different from that of the first wall portion, and along the When viewed in the axial direction, the dimension in the extending direction of the first wall portion is smaller than the dimension in the extending direction of the second wall portion. The rotating electric machine according to claim 1, wherein the housing has a housing flow path portion through which a fluid flows, The stator fixing portion includes a stator fixing portion provided at a portion of the peripheral wall portion connected to the casing flow path portion. The rotating electric machine according to claim 8, wherein the housing flow path portion protrudes radially outward from the peripheral wall portion. The rotating electric machine according to claim 9, wherein the rotating electric machine further has a cooler that cools the fluid flowing in the flow path portion of the casing, the casing has a cooler mounting portion, and the cooling The cooler mounting portion is provided for mounting the cooler, and the stator fixing portion includes a stator fixing portion provided at a portion of the peripheral wall portion connected to the cooler mounting portion. The rotating electric machine according to claim 8, wherein the rotating electric machine further has a pump for delivering the fluid flowing in the flow path portion of the housing, and the housing has a pump mounting portion for the pump mounting portion. The pump is mounted, and the stator fixing portion includes a stator fixing portion provided at a portion of the peripheral wall connected to the pump mounting portion. A driving device, which is mounted on a vehicle to rotate an axle, wherein the driving device includes: a rotating electric machine as described in any one of claims 1 to 11; and a transmission device, which is connected to the rotating electric machine to The rotation of the rotor transmits to the axle. A rotating electrical machine comprising: a rotor rotatable about a central axis extending in the axial direction; a stator having a stator core located radially outside of the rotor; and a casing accommodating the rotor and the stator; and a bearing that rotatably supports the rotor, and the housing has: a cover wall portion located on one axial side of the stator; A radially outer peripheral edge portion of the wall portion extends to the other side in the axial direction, a bearing holding portion provided on the cover wall portion internally holds the bearing; and a rib provided on the shaft in the cover wall portion. On the other side, the bearing holding portion is connected to the peripheral wall portion, the peripheral wall portion has a stator fixing portion for fixing the stator core, and the ribs include a first rib when viewed in the axial direction. , the first rib extends from the bearing holding portion toward the stator fixing portion in a direction inclined relative to the radial direction centered on the central axis, the first rib has: a first connecting portion, connected to the bearing holding portion; and a second connecting portion located radially outward from the first connecting portion, The end portion on the other axial side of the second connection portion is connected to the peripheral wall portion, and is located on one side in the axial direction than the end portion on the other axial side of the first connection portion.

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