Rotating Electric Machine

Abstract

To provide a rotary electric machine with a simplified structure.SOLUTION: A rotary electric machine includes a rotor including a housing, a stator housed in the housing, a rotor core housed in the housing, and a shaft to which the rotor core is fixed, a bearing that rotatably supports the shaft with respect to the housing, an oil tank that stores lubricating oil for lubricating the bearing, a cooling unit that cools the lubricating oil, a first pipe unit connecting the oil tank and the cooling unit, a rotating member that contacts the lubricating oil in the oil tank and rotates with the rotation of the shaft to send the lubricating oil in the oil tank to the cooling unit through the first pipe unit, and a second pipe unit provided between the oil tank and the cooling unit, and allowing the lubricating oil to flow from the cooling unit to the oil tank.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a rotating electric machine is provided with a cooling unit that cools a bearing supporting a rotor shaft by cooling the lubricating oil in the bearing. For example, a pump driven by a motor circulates the lubricating oil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-201516 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional rotating electrical machines, the lubricating oil is circulated by a pump, which requires a separate power source for the pump, and tends to make the structure complicated.

[0005] One example of a problem to be solved by the present invention is to provide a rotating electric machine that can have a simplified structure. [Means for solving the problem]

[0006] A rotating electric machine according to an embodiment of the present invention includes a housing, a rotor having a stator housed in the housing, a rotor core housed in the housing, and a shaft to which the rotor core is fixed, a bearing that rotatably supports the shaft with respect to the housing, an oil tank that stores lubricating oil for lubricating the bearing, a cooling unit that cools the lubricating oil, a first piping unit that connects the oil tank and the cooling unit, a rotating member that comes into contact with the lubricating oil in the oil tank and rotates in conjunction with rotation of the shaft to send the lubricating oil in the oil tank to the cooling unit through the first piping unit, and a second piping unit that is provided between the oil tank and the cooling unit and allows the lubricating oil to flow from the cooling unit to the oil tank. The second piping section has an outlet communicating with an internal space of the oil tank above the bearing, and supplies the lubricating oil to the bearing from the outlet. do. Effect of the Invention

[0007] According to the rotating electric machine of the present invention, it is possible to obtain a rotating electric machine with a simplified structure. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of the rotating electric machine of the present embodiment. [Diagram 2] FIG. 2 is a front view of the rotating electric machine of the present embodiment. [Diagram 3] FIG. 3 is a schematic cross-sectional view of the rotating electric machine of the present embodiment. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a part of the rotating electric machine of this embodiment. [Diagram 5] FIG. 5 is a plan view of the first rotating member of the present embodiment. [Figure 6] FIG. 6 is a cross-sectional view of the bearing and the second rotating member of the present embodiment. [Figure 7] FIG. 7 is a diagram showing the configuration of the rotating electric machine of this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The rotating electric machine 1 according to this embodiment will be described below with reference to the drawings. The configuration of the embodiment described below and the actions and results (effects) brought about by the configuration are merely examples and are not limited to the contents described below. Note that in this specification, ordinal numbers are used only to distinguish parts and members and do not indicate order or priority.

[0010] <Embodiment> Fig. 1 is a side view of a rotating electric machine 1 according to this embodiment. Fig. 2 is a front view of the rotating electric machine 1 according to this embodiment. The rotating electric machine 1 is, for example, a motor or a generator. However, the rotating electric machine 1 is not limited to this example. As shown in Fig. 2, the rotating electric machine 1 includes a main body 2, a cooling device 3, a bearing cooling device 4, and a control device 5.

[0011] The rotating electric machine 1 is, for example, a totally enclosed rotating electric machine. Therefore, inside the rotating electric machine 1, a closed space filled with a cooling gas such as air is provided between the main body 2 and the cooling device 3.

[0012] Fig. 3 is a schematic cross-sectional view of the rotating electric machine 1 of this embodiment. Fig. 4 is an enlarged cross-sectional view of a portion of the rotating electric machine 1 of this embodiment. As shown in Fig. 3, the main body 2 has a housing 21, a rotor 22, a stator 23, and two bearings 24. Also, as shown in Fig. 4, the main body 2 has two oil tanks 25, four first rotating members 26, and two second rotating members 27.

[0013] In Fig. 3, the oil tank 25, the first rotating member 26, and the second rotating member 27 are omitted from the illustration. In Fig. 4, two first rotating members 26 and one second rotating member 27 are shown. The first rotating member 26 and the second rotating member 27 are examples of rotating members.

[0014] In the following drawings, three mutually orthogonal directions are defined for convenience. The X direction is a direction along the longitudinal direction of the housing 21 and the axial direction of the rotation center axis Ax of the rotor 22, and may also be referred to as the front-rear direction. The Y direction is a direction along a direction perpendicular to the lateral direction of the housing 21 and the axial direction of the rotation center axis Ax, and may also be referred to as the left-right direction. The Z direction is a direction along the vertical direction of the housing 21, and may also be referred to as the up-down direction. Note that the expressions indicating directions such as front-rear, left-right, up-down, and down in this embodiment are names for convenience, and do not limit the position, attitude, and usage mode of the rotating electric machine 1.

[0015] 1 to 3, housing 21 is formed in a box shape. Housing 21 accommodates a part of rotor 22 and stator 23. Housing 21 has a bottom wall 21a, a top wall 21b, two end walls 21c, 21d, and two side walls 21e, 21f.

[0016] The bottom wall 21a and the top wall 21b both extend along a direction perpendicular to the Z direction (XY plane) and are provided approximately parallel to each other with a gap in the Z direction. The bottom wall 21a forms the lower end of the housing 21, and the top wall 21b forms the upper end of the housing 21.

[0017] End wall 21c and end wall 21d both extend in a direction perpendicular to the X direction (YZ plane) and are provided parallel to each other with a gap in the X direction. End wall 21c is provided between the ends of bottom wall 21a and top wall 21b in the opposite direction to the X direction. End wall 21d is provided between the ends of bottom wall 21a and top wall 21b in the X direction.

[0018] Both side wall 21e and side wall 21f extend in a direction perpendicular to the Y direction (XZ plane) and are provided parallel to each other with a gap in the Y direction. Side wall 21e is provided between the respective ends of bottom wall 21a and top wall 21b in the Y direction. Side wall 21f is provided between the respective ends of bottom wall 21a and top wall 21b in the opposite direction to the Y direction.

[0019] 2, a cooling device 3 is attached to the top wall 21b. Furthermore, a bearing cooling device 4 is attached to the side wall 21e. Furthermore, a control device 5 is attached to the side wall 21f. That is, the bearing cooling device 4 and the control device 5 are disposed on opposite sides of the housing 21. In other words, the housing 21 is disposed between the bearing cooling device 4 and the control device 5.

[0020] 3, the rotor 22 has a shaft 221 and a rotor core 222. The shaft 221 is supported by the housing 21 via two bearings 24 so as to be rotatable around a rotation center axis Ax. In other words, the two bearings 24 support the shaft 221 so as to be rotatable with respect to the housing 21. The rotation center axis Ax is, for example, the central axis (center line) of the shaft 221. Note that the rotation center axis Ax may be different from the central axis of the shaft 221.

[0021] In the following description, for convenience, the axial direction, radial direction, and circumferential direction of the rotation central axis Ax are defined. The axial direction is a direction along the rotation central axis Ax. The radial direction is a direction perpendicular to the rotation central axis Ax. The circumferential direction is a direction around the rotation central axis Ax.

[0022] The axial direction, radial direction, and circumferential direction of the central axis of rotation Ax are the same as the axial direction, radial direction, and circumferential direction of the shaft 221. In the following description, unless otherwise specified, the axial direction, radial direction, and circumferential direction refer to the axial direction, radial direction, and circumferential direction of the central axis of rotation Ax, that is, the axial direction, radial direction, and circumferential direction of the shaft 221.

[0023] The shaft 221 extends in the X direction so as to penetrate the end walls 21c and 21d. A portion of the shaft 221 between both axial ends 221a, 221b is housed in the housing 21. On the other hand, both axial ends 221a, 221b of the shaft 221 protrude from the housing 21 to the outside.

[0024] One end 221a is coupled to, for example, a coupling target (not shown). An external fan (not shown) is fixed to the other end 221b. The external fan is covered by, for example, an external fan cover, and rotates together with the shaft 221.

[0025] Rotor core 222 is fixed to a portion of shaft 221 between both axial ends 221a, 221b. For this reason, rotor core 222 is housed in housing 21. Rotor core 222 rotates integrally with shaft 221.

[0026] An internal fan 28 is fixed between each of the two bearings 24 on the shaft 221 and the rotor core 222. The internal fan 28 rotates integrally with the shaft 221, and circulates a cooling gas in the closed space.

[0027] 4, the shaft 221 has an axis portion 221c and a mounted portion 221d. The axis portion 221c and the mounted portion 221d are each a part of the shaft 221. For example, an internal fan 28 is attached to the axis portion 221c. The mounted portion 221d is supported by a bearing 24.

[0028] The mounted portion 221d is, for example, a portion of the shaft portion 221c that is reduced in the radial direction. That is, the diameter of the mounted portion 221d is shorter than the diameter of the shaft portion 221c. The diameter of the mounted portion 221d may be longer than the diameter of the shaft portion 221c.

[0029] As shown in Fig. 3, the stator 23 is accommodated in the housing 21. The stator 23 has a stator core 231 and a stator winding 232. The stator core 231 is fixed to the housing 21. The stator core 231 is located outside the rotor core 222 in the radial direction, and is formed in a cylindrical shape surrounding the rotor core 222. The stator winding 232 passes through a plurality of slots (not shown) formed in an inner periphery 231a of the stator core 231 so as to extend in the axial direction, and is fixed to the stator core 231.

[0030] The bearings 24 are, for example, slide bearings, and are lubricated with lubricating oil. The two bearings 24 are provided on the two end walls 21c and 21d. That is, in the shaft 221, the rotor core 222 is located between the two bearings 24 in the axial direction.

[0031] 4, each bearing 24 has a first bearing metal 241 and a second bearing metal 242. In this embodiment, the first bearing metal 241 and the second bearing metal 242 are different components and are separable. However, the bearing 24 is not limited to this example.

[0032] The first bearing metal 241 is located above the second bearing metal 242. Furthermore, at least a portion of the first bearing metal 241 is located above the mounted portion 221d of the shaft 221. The first bearing metal 241 has an inner circumferential surface 241a.

[0033] An inner peripheral surface 241a of the first bearing metal 241 faces the outer peripheral surface of the mounted portion 221d. The diameter of the inner peripheral surface 241a is, for example, slightly larger than the diameter of the mounted portion 221d. The inner peripheral surface 241a is capable of supporting the mounted portion 221d.

[0034] A groove 241b is provided in the first bearing metal 241. The groove 241b is recessed from an inner circumferential surface 241a of the first bearing metal 241 toward the outside in the radial direction of the shaft 221, and extends in the circumferential direction of the shaft 221.

[0035] At least a portion of the second bearing metal 242 is located below the mounted portion 221d of the shaft 221. The second bearing metal 242 has an inner circumferential surface 242a. The inner circumferential surface 242a faces the outer circumferential surface of the mounted portion 221d.

[0036] The diameter of the inner circumferential surface 242a of the second bearing metal 242 is, for example, slightly larger than the diameter of the mounted portion 221d. For example, the diameter of the inner circumferential surface 242a of the second bearing metal 242 is substantially equal to the diameter of the inner circumferential surface 241a of the first bearing metal 241. Moreover, the inner circumferential surfaces 241a, 242a are arranged concentrically around the rotation center axis Ax.

[0037] An inner circumferential surface 242a of the second bearing metal 242 is capable of supporting a mounted portion 221d of the shaft 221. The mounted portion 221d is disposed between the inner circumferential surface 241a of the first bearing metal 241 and the inner circumferential surface 242a of the second bearing metal 242.

[0038] The second bearing metal 242 is attached to the first bearing metal 241. As a result, the mounted portion 221d is supported by being sandwiched between the first bearing metal 241 and the second bearing metal 242. In other words, each bearing 24 supports the shaft 221 between the first bearing metal 241 and the second bearing metal 242.

[0039] 1, the two oil tanks 25 are attached to the two end walls 21c, 21d around the corresponding bearings 24. Each oil tank 25 has a space for storing lubricating oil F for lubricating each bearing 24.

[0040] 4, each oil tank 25 has, for example, two first storage spaces 251 and a second storage space 252. Lubricating oil F is stored in the first storage space 251 and the second storage space 252. The two first storage spaces 251 and the second storage space 252 are in communication with each other. Therefore, in the oil tank 25, the lubricating oil F can move between the first storage space 251 and the second storage space 252.

[0041] The first storage space 251 is provided below the shaft portion 221c of the shaft 221. The second storage space 252 is located between the two first storage spaces 251 in the axial direction of the shaft 221. The second storage space 252 is provided below the mounted portion 221d of the shaft 221 and the bearing 24.

[0042] Fig. 5 is a plan view of the first rotating member 26 of this embodiment. As shown in Fig. 5, each first rotating member 26 has a mounting ring 261 and a plurality of blades 262. However, the first rotating member 26 is not limited to this example.

[0043] The mounting ring 261 is formed in an annular shape. As shown in Fig. 4, the mounting ring 261 is attached to the outer circumferential surface of the shaft portion 221c of the shaft 221. In this way, the first rotating members 26 are attached to the shaft portion 221c. The two first rotating members 26 rotate with the rotation of the shaft 221. The first rotating members 26 may be integral with the shaft 221.

[0044] 5, the blades 262 protrude radially outward from the outer circumferential surface of the mounting ring 261. The blades 262 are arranged at intervals in the circumferential direction of the shaft 221. Each blade 262 is formed in a plate shape extending in the axial direction. Note that the shape of each blade 262 is not limited to this example.

[0045] 4, the two first rotating members 26 are positioned at a distance from each other in the axial direction of the shaft 221. In the axial direction of the shaft 221, the position of the first rotating member 26 and the positions of the two first storage spaces 251 approximately coincide with each other. Parts of the two first rotating members 26 are housed in the corresponding first storage spaces 251.

[0046] A part of the plurality of vanes 262 is partially immersed in the lubricating oil F stored in the first storage space 251. The protruding length of each vane 262 may be changed as appropriate as long as each vane 262 is partially immersed in the lubricating oil F stored in the first storage space 251.

[0047] Fig. 6 is a cross-sectional view of the bearing 24 and the second rotating member 27 of this embodiment taken along line F6-F6 in Fig. 4. As shown in Figs. 4 and 6, the second rotating member 27 has an oil ring 271. The oil ring 271 is attached to the bearing 24. Therefore, the oil ring 271 is located between the two first rotating members 26 in the axial direction of the shaft 221. The oil ring 271 may be a part of the bearing 24.

[0048] The oil ring 271 is formed in an annular shape. The oil ring 271 is disposed around the mounted portion 221d of the shaft 221. The oil ring 271 has an inner circumferential surface 271a and an outer circumferential surface 271b.

[0049] The inner circumferential surface 271a faces the mounted portion 221d of the shaft 221. The diameter of the inner circumferential surface 271a is larger than the outer diameter of the mounted portion 221d. The outer circumferential surface 271b is located on the opposite side to the inner circumferential surface 271a.

[0050] A plurality of grooves 272 recessed radially inward from the outer circumferential surface 271b are provided at intervals in the circumferential direction on the outer circumferential surface 271b. The plurality of grooves 272 are arranged at intervals in the circumferential direction of the shaft 221. The depth of each groove 272 is set so that the lubricating oil F can adhere thereto.

[0051] The oil ring 271 extends in an annular shape through a gap S between the first bearing metal 241 and the second bearing metal 242 of the bearing 24 in a state in which the shaft 221 is supported by each bearing 24. The center of the oil ring 271 is eccentric from the central rotation axis Ax.

[0052] An upper portion of the oil ring 271 is covered by the first bearing metal 241, and is rotatably fitted in a groove 241b of the first bearing metal 241. The oil ring 271 is suspended from the mounted portion 221d and supported near the top of the mounted portion 221d. Therefore, the oil ring 271 rotates in conjunction with the rotation of the shaft 221.

[0053] The portion of the oil ring 271 other than its upper portion is exposed to the outside from the groove 241b of the first bearing metal 241. As shown in Fig. 4, the lower portion of the oil ring 271 is partially immersed in the lubricating oil F stored in the second storage space 252 of each oil tank 25. For this reason, the lubricating oil F enters the groove 272 provided in the lower portion of the oil ring 271.

[0054] In this embodiment, in each oil vat 25, the two first rotating members 26 and the second rotating member 27 are attached to the shaft 221. However, for example, the rotating electric machine 1 may have one of the two first rotating members 26 and the second rotating member 27 attached to the shaft 221.

[0055] 1, the cooling device 3 is placed on top wall 21b of the housing 21 and fixed to the top wall 21b. The cooling device 3 cools the rotor 22 and the stator 23 by exchanging heat between the cooling gas in the housing 21 and the outside air outside the housing 21. An external fan causes the outside air to flow past the cooling device 3.

[0056] Fig. 7 is a diagram showing the configuration of a rotating electric machine 1 of this embodiment. As shown in Fig. 7, the bearing cooling device 4 has a housing 41, a cooling section 42, an AC / DC converter 43, a first piping section 44, a second piping section 45, a connecting section 46, a flange 47, and a fastener 48. In other words, the rotating electric machine 1 has the housing 41, the cooling section 42, the AC / DC converter 43, the first piping section 44, the second piping section 45, and two connecting sections 46.

[0057] The housing 41 is formed in a box shape and houses the cooling unit 42 and the AC / DC converter 43. The housing 41 is detachably fixed to the side wall 21e of the housing 21 of the main body 2 by fasteners such as bolts.

[0058] The cooling unit 42 cools the lubricating oil F passing through the cooling unit 42. The cooling unit 42 has, for example, a heat exchanger through which the lubricating oil F passes and a fan, and is cooled by heat exchange with the air outside the heat exchanger (outside air). The fan blows air so that the air flows along the surface of the heat exchanger. The AC / DC converter 43 supplies power to the fan of the cooling unit 42.

[0059] The first piping section 44 has pipes 44a and 44b. The pipe 44a extends from the oil vat 25. The pipe 44b extends from the cooling section 42. The pipes 44a and 44b are detachably connected to each other at a connection section 46. The first piping section 44 is provided between each oil vat 25 and the cooling section 42. That is, the first piping section 44 connects each oil vat 25 and the cooling section 42.

[0060] 4, the inlet 44c of the first piping section 44 is connected to one of the first storage spaces 251 in each oil tank 25. That is, the first piping section 44 is connected to the oil tank 25 at a position in the axial direction of the shaft 221 where the first rotating member 26 is provided.

[0061] 7, the second piping section 45 has pipes 45a and 45b. The pipe 45a extends from the oil vat 25. The pipe 45b extends from the cooling section 42. The pipes 45a and 45b are detachably connected to each other at a connection section 46. The second piping section 45 is provided between each oil vat 25 and the cooling section 42. That is, the second piping section 45 is provided between each oil vat 25 and the cooling section 42, and connects each oil vat 25 and the cooling section 42.

[0062] The lubricating oil F cooled by the cooling section 42 can flow through the second piping section 45 from the cooling section 42 to each oil tank 25. An outlet 45c of the second piping section 45 communicates with the internal space of the oil tank 25 above each bearing 24. Therefore, in the oil tank 25, the lubricating oil F is supplied from above the bearing 24 to the bearing 24, the first storage space 251, and the second storage space 252.

[0063] The connecting portion is provided between the pipe 44a and the pipe 44b of the first piping portion 44, and between the pipe 45a and the pipe 45b of the second piping portion 45. The connecting portion has a flange 47 and a coupling member .

[0064] The flanges 47 are provided on one ends of the pipes 44a, 44b of the first piping section 44 and on one ends of the pipes 45a, 45b of the second piping section 45. The couplings 48 are bolts or the like that couple the two flanges 47 together.

[0065] The control device 5 controls the rotational operation of the rotating electric machine 1 and the bearing cooling device 4. For example, the control device 5 has a board and various electronic components such as a microcomputer mounted on the board. The control device 5 is electrically connected to the bearing cooling device 4 and the stator 23.

[0066] When the rotating electric machine 1 is operated, the two first rotating members 26 and the second rotating member 27 attached to the shaft 221 rotate in accordance with the rotation of the shaft 221. The plurality of blades 262 of the rotating first rotating member 26 increase the pressure of the lubricating oil F stored in the first storage space 251. In addition, the plurality of grooves 272 of the rotating second rotating member 27 increase the pressure of the lubricating oil F stored in the second storage space 252.

[0067] The lubricating oil F pressurized in the first storage space 251 and the second storage space 252 is sent from the inlet 44c of the first piping section 44 to the cooling section 42. In other words, the first rotating members 26 and the second rotating members 27 come into contact with the lubricating oil F in the oil tanks 25 and rotate with the rotation of the shaft 221 to send the lubricating oil F in the oil tanks 25 to the cooling section 42 through the first piping section 44. At this time, the lubricating oil F adhering to the vanes 262 and the grooves 272 is wiped off near the top of the shaft 221. The wiped off lubricating oil F enters between the shaft 221 and the bearing 24 and lubricates this portion.

[0068] The lubricating oil F that has passed through the cooling section 42 is cooled and discharged from the outlet 45c of the second piping section 45. The lubricating oil F discharged from the outlet 45c of the second piping section 45 is supplied to each bearing 24 to lubricate and cool the bearing 24.

[0069] The lubricating oil F supplied to each bearing 24 flows down and is stored in the first storage space 251 and the second storage space 252 of each oil tank 25. Thereafter, the lubricating oil F circulates between each oil tank 25 and the cooling section 42 in a similar manner.

[0070] As described above, the rotating electric machine 1 of this embodiment includes the housing 21, the rotor 22, the stator 23, the bearing 24, the oil tank 25, the first rotating member 26, the second rotating member 27, the cooling unit 42, the first piping unit 44, and the second piping unit 45. The rotor 22 has the rotor core 222 housed in the housing 21 and the shaft 221 to which the rotor core 222 is fixed. The stator 23 is housed in the housing 21. The bearing 24 supports the shaft 221 rotatably relative to the housing 21. The oil tank 25 stores the lubricating oil F that lubricates the bearing 24. The cooling unit 42 cools the lubricating oil F. The first piping unit 44 connects the oil tank 25 and the cooling unit 42. The first rotating member 26 and the second rotating member 27 come into contact with the lubricating oil F in the oil tank 25 and rotate with the rotation of the shaft 221, thereby sending the lubricating oil F in the oil tank 25 to the cooling section 42 through the first piping section 44. The second piping section 45 is provided between the oil tank 25 and the cooling section 42. The lubricating oil F can flow through the second piping section 45 from the cooling section 42 to the oil tank 25.

[0071] In the rotating electric machine 1 in operation, the first rotating member 26 and the second rotating member 27 provided on the shaft 221 rotate in accordance with the rotation of the shaft 221. The lubricating oil F stored in the oil tank 25 is sent out from the first piping section 44 by the rotating first rotating member 26 and second rotating member 27, passes through the cooling section 42, and is returned to the oil tank 25 from the second piping section 45. The lubricating oil F returned from the second piping section 45 is stored in the oil tank 25. Thereafter, the lubricating oil F circulates between the oil tank 25 and the cooling section 42 while being cooled by the cooling section 42.

[0072] As a result, the rotating electric machine 1 can cool the lubricating oil F without providing a pump for circulating the lubricating oil F. This simplifies the structure of the rotating electric machine 1. In addition, because the rotating electric machine 1 does not require a pump for circulating the lubricating oil F, costs can be reduced.

[0073] Moreover, in this embodiment, the first rotating member 26 has a plurality of vanes 262 arranged at intervals in the circumferential direction of the shaft 221. This makes it easier for the first rotating member 26 to send out the lubricating oil F stored in the oil tank 25 from the first piping section 44. This makes it easier for the lubricating oil F to circulate between the oil tank 25 and the cooling section 42. This makes it easier for the first rotating member 26 to cool the lubricating oil F.

[0074] In this embodiment, the bearing 24 has a first bearing metal 241 and a second bearing metal 242, and supports the shaft 221 between the first bearing metal 241 and the second bearing metal 242. The second bearing metal 242 is attached to the first bearing metal 241. The second rotating member 27 has an oil ring 271. The oil ring 271 extends in an annular shape passing between the first bearing metal 241 and the second bearing metal 242, and is partially immersed in the lubricating oil F in the oil tank 25. The oil ring 271 has an inner circumferential surface 271a facing the shaft 221 and an outer circumferential surface 271b located on the opposite side to the inner circumferential surface 271a, and a plurality of grooves 272 are provided on the outer circumferential surface 271b.

[0075] In the rotating electric machine 1 in operation, not only the first rotating member 26 but also the oil ring 271 rotates in conjunction with the rotation of the shaft 221. The lubricating oil F is scooped up by a plurality of grooves 272 provided on the outer circumferential surface 271b of the oil ring 271, and lubricates the gap between the first bearing metal 241 and the second bearing metal 242 and the shaft 221. This makes it easier for the bearing 24 to be cooled by the lubricating oil F. In addition, since the oil ring 271 provided on the bearing 24, which is a sliding bearing, sends out the lubricating oil F, the rotating electric machine 1 can suppress an increase in the number of parts.

[0076] In this embodiment, the first piping section 44 is connected to the oil tank 25 at a position in the axial direction of the shaft 221 where the first rotating member 26 is provided. When the lubricating oil F stored in the oil tank 25 circulates from the first piping section 44 to the second piping section 45, the lubricating oil F pumped out from the first piping section 44 is more likely to receive pressure from the first rotating member 26 the closer it is to the first rotating member 26. This makes it easier for the first rotating member 26 to pump out the lubricating oil F from the first piping section 44.

[0077] Although the embodiment of the present invention has been described above, the above embodiment is merely an example and is not intended to limit the scope of the invention. The above embodiment can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the gist of the invention. Furthermore, the specifications of each configuration, shape, and the like (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately changed and implemented. [Explanation of symbols]

[0078] Reference Signs List: 1... rotating electric machine, 21... housing, 22... rotor, 221... shaft, 222... rotor core, 23... stator, 24... bearing, 241... first bearing metal, 242... second bearing metal, 25... oil tank, 26... first rotating member (rotating member), 262... blade, 27... second rotating member (rotating member), 271... oil ring, 271a... inner surface, 271b... outer surface, 272... groove, 42... cooling section, 44... first piping section, 45... second piping section, F... lubricating oil.

Claims

1. A housing and A stator housed in the housing; a rotor having a rotor core accommodated in the housing and a shaft to which the rotor core is fixed; a bearing that supports the shaft rotatably relative to the housing; an oil tank for storing lubricating oil for lubricating the bearing; A cooling unit that cools the lubricating oil; A first piping section that connects the oil tank and the cooling section; A rotating member that contacts the lubricating oil in the oil tank and rotates with the rotation of the shaft to send the lubricating oil in the oil tank to the cooling section through the first piping section; A second piping section provided between the oil tank and the cooling section, allowing the lubricating oil to flow from the cooling section to the oil tank; Equipped with The second piping section has an outlet communicating with an internal space of the oil tank above the bearing, and supplies the lubricating oil to the bearing from the outlet. Rotating electric motor.

2. The rotating member has a plurality of blades arranged at intervals in the circumferential direction of the shaft. The rotating electric machine according to claim 1 .

3. the bearing has a first bearing metal and a second bearing metal attached to the first bearing metal, and supports the shaft between the first bearing metal and the second bearing metal; the rotating member has an oil ring extending annularly between the first bearing metal and the second bearing metal and partially immersed in the lubricating oil in the oil tank; The oil ring has an inner circumferential surface facing the shaft and an outer circumferential surface located on the opposite side of the inner circumferential surface, and a plurality of grooves are provided on the outer circumferential surface. The rotating electric machine according to claim 1 .

4. The first piping section is connected to the oil tank at a position where the rotating member is provided in the axial direction of the shaft. The rotating electric machine according to any one of claims 1 to 3.

5. The oil tank has a first storage space for storing the lubricating oil, and a second storage space aligned with the first storage space in the axial direction of the shaft, partitioned off from the first storage space, communicating with the first storage space, and for storing the lubricating oil; The rotating member includes a first rotating member that contacts the lubricating oil in the first storage space and a second rotating member that contacts the lubricating oil in the second storage space, The second rotating member rotates in association with the rotation of the shaft to increase the pressure of the lubricating oil in the second storage space, The first rotating member rotates in association with the rotation of the shaft to pressurize the lubricating oil in the first storage space and send it to the cooling section through the first piping section. The rotating electric machine according to claim 1 .

6. The outlet communicates with the internal space of the oil tank above the second storage space, The rotating electric machine according to claim 5 .

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