CN220190556U - Oil cooling device of motor rotor and motor - Google Patents

Abstract

The utility model discloses an oil cooling device of a motor rotor and a motor, wherein the oil cooling device of the motor rotor comprises an oil guide ring and an oil guide pipe, the oil guide ring is annular with a central through hole, an oil guide cavity arranged around the central through hole is arranged in the oil guide ring, an opening is arranged on the inner peripheral surface of the oil guide ring, and the opening is communicated with the oil guide cavity; the oil guide pipe is connected with the oil guide ring and is communicated with the oil guide cavity. According to the oil cooling device provided by the embodiment of the utility model, the oil guide ring is arranged, the opening is arranged on the inner peripheral surface of the oil guide ring, the cooling liquid enters the oil guide cavity from the oil guide pipe and flows out of the opening onto the rotor, the oil cooling device is matched with the rotor through the flow guide of the cooling liquid, so that heat on the rotor is taken away, the structure is simple, the cooling of the motor rotor can be realized, and the working efficiency of the motor is improved.

Description

Oil cooling device of motor rotor and motor

Technical Field

The utility model relates to the technical field of motors, in particular to an oil cooling device of a motor rotor and a motor comprising the oil cooling device.

Background

The cruising mileage is one of key technical indexes of the new energy automobile, and improving the efficiency of a power assembly system is the most economical means for solving the cruising problem, wherein the output power of a lifting motor can improve the system efficiency of the power assembly to a certain extent. The motor generates heat in the working process, the loss of the motor can be reduced by cooling the motor, and the output power of the motor is improved. In the related art, only the stator is usually cooled, the rotor of the motor is not cooled, or the rotor is cooled in an air cooling mode, so that the cooling effect of the motor is not ideal, the output power of the motor is influenced, and the efficiency of an electric drive system cannot be effectively improved.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present utility model is to provide an oil cooling device for a motor rotor, wherein an oil guiding ring is provided to guide cooling liquid, and the oil cooling device is matched with the rotor to realize cooling of the motor rotor.

Another object of the present utility model is to propose an electric machine comprising an oil cooling device of the aforementioned rotor.

The oil cooling device of the motor rotor comprises an oil guide ring and an oil guide pipe; the oil guide ring is annular with a central through hole, an oil guide cavity arranged around the central through hole is formed in the oil guide ring, an opening is formed in the inner peripheral surface of the oil guide ring, and the opening is communicated with the oil guide cavity; the oil guide pipe is connected with the oil guide ring and is communicated with the oil guide cavity.

According to the oil cooling device of the motor rotor, the oil guide ring is arranged, the opening is formed in the inner peripheral surface of the oil guide ring, cooling liquid enters the oil guide cavity from the oil guide pipe and flows out of the opening onto the rotor, the oil cooling device is matched with the rotor through guiding the cooling liquid, heat on the rotor is taken away, the structure is simple, cooling of the motor rotor can be achieved, and the working efficiency of the motor is improved.

In addition, the oil cooling device for the motor rotor according to the above embodiment of the present utility model may further have the following additional technical features:

optionally, the oil guiding ring includes: the first side plate is an annular plate; a second side plate which is laminated with the first side plate with a gap, and which is an annular plate; and an outer side plate extending in a circumferential direction of the oil guide ring and connected to an outer peripheral edge of the first side plate and an outer peripheral edge of the second side plate, respectively, an inner peripheral edge of the first side plate and an inner peripheral edge of the second side plate being spaced apart to open inside the oil guide ring to form the opening.

Optionally, a thickness of at least one of the first side plate, the second side plate, and the outer side plate is in a range of 1 mm to 4 mm.

Optionally, the oil guide pipe is connected to the outer side plate and extends toward the outer side of the oil guide ring in the radial direction of the oil guide ring.

Optionally, a portion of the outer side plate is recessed toward the central through hole of the oil guiding ring to form a relief groove, and the relief groove penetrates through the oil guiding ring along an axial direction of the oil guiding ring.

Optionally, the end of the oil guide pipe far away from the oil guide ring is provided with a first limit rib and a second limit rib, the first limit rib and the second limit rib are spaced apart along the axial direction of the oil guide pipe, and a seal ring accommodating groove is formed between the first limit rib and the second limit rib.

Optionally, the oil cooling device further comprises: and the mounting bracket is connected with the oil guide ring and is used for mounting the oil cooling device.

Optionally, the oil guiding ring is a plastic ring, and the mounting bracket and the oil guiding ring are connected into a whole through injection molding.

Optionally, the mounting bracket includes a first step portion, a second step portion and a third step portion, the first step portion is connected with the oil guiding ring, the first step portion and the third step portion have a distance in an axial direction of the oil guiding ring, the second step portion is connected between the first step portion and the second step portion, the second step portion is in an arc plate shape in a circumferential direction of the oil guiding ring, and the first step portion has ribs extending along a radial direction of the oil guiding ring.

According to the embodiment of the utility model, the motor comprises the oil cooling device of the motor rotor. The cooling liquid is introduced into the rotor shaft through the oil cooling device so as to take away heat on the rotor, realize cooling of the rotor and further improve the efficiency of the motor.

Drawings

Fig. 1 is a schematic view of an oil cooling apparatus of an embodiment of the present utility model.

Fig. 2 is an installation schematic of an oil cooling apparatus of an embodiment of the present utility model.

Fig. 3 is a cross-sectional view of an electric machine according to an embodiment of the present utility model.

Reference numerals:

the oil cooling device 100, the oil guiding ring 10, the opening 11, the first side plate 12, the second side plate 13, the outer side plate 14, the abdication groove 15, the oil guiding pipe 20, the first limit rib 21, the second limit rib 22, the sealing ring accommodating groove 23, the mounting bracket 30, the first step part 31, the second step part 32, the third step part 33, the small half shaft 2, the shell 3, the oil groove 3a, the rotating shaft 4, the oil guiding groove 5, the end plate 6 and the end cover 7.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

Referring to fig. 1, an oil cooling device 100 of a motor rotor according to an embodiment of the present utility model includes an oil guiding ring 10, the oil guiding ring 10 has a ring shape with a central through hole, an oil guiding cavity disposed around the central through hole is provided in the oil guiding ring 10, an opening 11 is disposed on an inner circumferential surface of the oil guiding ring 10, the opening 11 is communicated with the oil guiding cavity, and a cooling liquid in the oil guiding cavity can flow out from the oil guiding cavity through the opening 11, so as to realize guiding of the cooling liquid.

The motor rotor oil cooling device 100 can further comprise an oil guide pipe 20, the oil guide pipe 20 is connected with the oil guide ring 10 and is communicated with the oil guide cavity, cooling liquid enters the oil guide ring 10 from the oil guide pipe 20 and flows out of the opening 11 of the oil guide ring 10 onto the rotor, the oil cooling device 100 guides the cooling liquid into the rotor, heat on the motor rotor is taken away, and cooling of the motor rotor is achieved.

According to the motor rotor oil cooling device 100 of the embodiment of the utility model, the cooling liquid flows from the oil guide pipe 20 into the oil guide chamber of the oil guide ring 10 provided around the center through hole, and the cooling liquid in the oil guide chamber flows out from the opening 11 by providing the opening 11 on the inner peripheral surface of the oil guide ring 10 to guide the cooling liquid. The oil guide ring 10 is matched with the rotor, the cooling liquid is introduced into the rotor, the structure is simple, the cooling liquid is guided into the rotor through the cooling liquid, the cooling liquid takes away heat on the rotor in the flowing process, the rotor is cooled, and the power of the motor is improved.

Referring to fig. 1 and 3, an oil cooling device 100 for a motor rotor according to the present utility model may be used for cooling the motor rotor by oil cooling, where the cooling fluid may be cooling oil or other coolant. The oil cooling device 100 of the motor rotor can be matched with the rotor, the oil cooling device 100 guides cooling oil to the inside of the rotor so as to take away heat on the rotor, realize cooling of the rotor and further improve the working efficiency of the electric drive system. The oil cooling device 100 is matched with the rotor, in particular, the motor can comprise a small half shaft 2 and a rotating shaft 4, and an oil guide groove 5 is arranged between the rotating shaft 4 and the small half shaft 2. The oil cooling device 100 is provided with a central through hole, the oil guide ring 10 with the central through hole can be sleeved on the small half shaft 2 of the motor and is in clearance fit with the small half shaft 2 of the motor, and cooling oil flows into the oil guide cavity from the oil guide pipe 20 and enters the oil guide groove 5 between the rotating shaft 4 and the small half shaft 2 from the opening 11 through the clearance between the oil guide ring 10 and the small half shaft 2, so that the rotating shaft 4 is cooled. The small half shaft 2 can penetrate through the cavity of the rotating shaft 4, the small half shaft 2 can transmit power, specifically, the power of the motor is transmitted to the speed reducer, the speed reducer is transmitted to the small half shaft 2, and the small half shaft 2 transmits the power to the half shaft to the driving wheel.

In some embodiments of the utility model, referring to fig. 1, the oil guiding ring 10 may include a first side plate 12, a second side plate 13 and an outer side plate 14, the first side plate 12 is an annular plate, the second side plate 13 is laminated with the first side plate 12 with a gap, and the second side plate 13 is an annular plate, the outer side plate 14 extends along the circumference of the oil guiding ring 10 and is respectively connected with the outer circumferential edge of the first side plate 12 and the outer circumferential edge of the second side plate 13, the inner circumferential edge of the first side plate 12 and the inner circumferential edge of the second side plate 13 are spaced apart to open on the inner side of the oil guiding ring 10 to form an opening 11, that is, the inner circumferential surface of the oil guiding ring 10 may be entirely open, the cooling oil flows out through the opening 11, enters the oil guiding groove 5 between the rotating shaft 4 and the small half shaft 2 through the gap between the oil guiding ring 10 and the small half shaft 2, and the cooling oil takes away heat on the rotor during the flowing process to cool the rotor. The inner periphery of the first side plate 12 and the inner periphery of the second side plate 13 are spaced apart, and an opening 11 is formed on the inner side surface of the oil guiding ring 10, in other words, the inner side surface of the oil guiding ring 10 is open, so that the oil guiding efficiency can be improved, the heat exchange efficiency of the motor rotor can be further improved, and the working efficiency of the motor can be improved.

Referring to fig. 1, the oil guide ring 10 of the present utility model is provided with an opening 11 on an inner circumferential surface thereof, and may be such that an inner circumferential edge of a first side plate 12 is spaced apart from an inner circumferential edge of a second side plate 13, and the opening 11 is formed inside the oil guide ring 10; of course, the oil guiding ring 10 may further include an inner side plate opposite to the outer side plate 14, the inner side plate extends along the circumferential direction of the oil guiding ring 10 and is connected to the inner peripheral edge of the first side plate 12 and the inner peripheral edge of the second side plate 13, where the inner side plate may be provided with an opening 11 and is communicated with the oil guiding cavity. Wherein the first side plate 12 and the second side are laminated and have a gap, which can be adjusted according to the model of different motors. In addition, the opening 11 can be set into different shapes, so that cooling oil can enter the oil guide groove 5 between the rotating shaft 4 of the motor and the small half shaft 2 from the opening 11 through the gap between the oil guide ring 10 and the small half shaft 2, the cooling oil can be guided, and the purpose of cooling the motor rotor can be achieved.

In some embodiments of the utility model, at least one of the first side panel 12, the second side panel 13, and the outer side panel 14 has a thickness in the range of 1 millimeter to 4 millimeters. Specifically, the first side plate 12, the second side plate 13 and the outer side plate 14 surround the oil guiding cavity, and the cooling oil flows in through the oil guiding pipe 20 and then enters the oil guiding groove 5 between the rotating shaft 4 and the small half shaft 2 of the motor through the oil guiding cavity, and the structural stability of the oil guiding cavity can be ensured by at least one thickness of the first side plate 12, the second side plate 13 and the outer side plate 14 being in the range of 1 mm to 4 mm, so that a good oil guiding effect can be realized, the structure is simple, and the internal structure of the motor can be ensured to be compact. Preferably, the thicknesses of the first side plate 12, the second side plate 13 and the outer side plate 14 are 2 mm, so that the structure of the oil guiding ring 10 can be ensured to be stable, and the cooling oil can be effectively guided.

In some embodiments of the utility model, referring to fig. 1, an oil conduit 20 may be connected to the outer plate 14 and extend radially outward of the oil conduit 10 in the direction of the oil conduit 10. So that the connection structure of the oil guide pipe 20 and the oil guide ring 10 is stable and the efficiency of guiding the cooling oil is improved. The oil guide pipe 20 and the outer plate 14 may be integrally formed, so that the oil cooling device 100 has high overall structural strength, is easy to manufacture, and saves the cost of the motor.

Referring to fig. 2, the oil cooling device 100 of the motor rotor of the present utility model may be mounted on the end cover 7 of the motor, and the effect of guiding the cooling oil is stably achieved by fixing the oil cooling device 100.

In some embodiments of the utility model, referring to fig. 1, a portion of the outer plate 14 is recessed toward the central through hole of the oil-guiding ring 10 to form a relief groove 15, the relief groove 15 extending through the oil-guiding ring 10 in the axial direction of the oil-guiding ring 10. The yielding space surrounds in the yielding groove 15, and when the oil cooling device 100 is fixed on the end cover 7 of the motor, the screw on the end cover 7 can be avoided, so that the motor is compact in structure and the space inside the motor is fully utilized.

Referring to fig. 3, an oil guide pipe 20 of the present utility model has one end connected to an oil guide ring 10 and the other end connectable to an oil groove 3a on a motor housing 3, and cooling oil in the oil groove 3a enters an oil guide chamber in the oil guide ring 10 from the oil guide pipe 20. Wherein the oil groove 3a may be located between the motor housing and the stator.

Referring to fig. 1, in some embodiments of the present utility model, a first stop rib 21 and a second stop rib 22 are provided on an end of the oil conduit 20 remote from the oil conduit ring 10, the first stop rib 21 and the second stop rib 22 are spaced apart along an axial direction of the oil conduit 20, and a seal ring accommodating groove 23 is formed between the first stop rib 21 and the second stop rib 22. One end of the oil guide pipe 20 is connected with the oil guide ring 10, can be fixedly connected and can be also arranged into an integrally formed structure, so that the structural stability of the oil cooling device 100 is improved, the oil guide pipe is convenient to manufacture, one end of the oil guide pipe 20 far away from the oil guide ring 10 is connected with the oil groove 3a on the motor shell 3, and the sealing ring accommodating groove 23 is arranged at one end of the oil guide pipe 20 far away from the oil guide ring 10 and is matched with the oil groove 3a on the shell 3, so that good sealing effect is achieved, the cooling effect on a motor is prevented from being influenced by leakage of cooling oil, and the reliability of the motor is further improved.

In some embodiments of the utility model, in conjunction with fig. 1, the oil cooling device 100 may further comprise a mounting bracket 30, the mounting bracket 30 being connected to the oil guiding ring 10 and being used for mounting the oil cooling device 100. The oil cooling device 100 can be installed on a motor, specifically, can be installed on the end cover 7 of the motor, and the oil cooling device 100 is stably fixed on the end cover 7 of the motor by arranging the mounting bracket 30, so that the displacement of the oil cooling device 100 in the working process of the motor is avoided, the motor rotor is stably cooled, and the working efficiency of the motor is improved.

Further, the oil guiding ring 10 may be a plastic ring, and the mounting bracket 30 and the oil guiding ring 10 may be integrally connected by injection molding, that is, the mounting bracket 30 and the oil guiding ring 10 may be an integrally formed injection molding piece, so that the oil cooling device 100 is easier to manufacture, and in addition, the injection molding piece can reduce the production cost of the motor.

Referring to fig. 1, in some embodiments of the present utility model, the mounting bracket 30 may include a first stepped portion 31, a second stepped portion 32, and a third stepped portion 33, the first stepped portion 31 being connected to the oil ring 10, the first stepped portion 31 and the third stepped portion 33 having a space in an axial direction of the oil ring 10, and the second stepped portion 32 being connected between the first stepped portion 31 and the second stepped portion 32, and the second stepped portion 32 being in an arc plate shape in a circumferential direction of the oil ring 10.

The first step portion 31 has ribs extending along the radial direction of the oil guiding ring 10, and the number of the ribs may be plural, so as to improve the structural strength of the mounting bracket 30, and further improve the connection stability of the oil cooling device 100 and the motor end cover 7.

The oil cooling device 100 may be fixed to the motor end cover 7 using bolts, and the third step portion 33 may be provided with a mounting hole, which may be a threaded hole, so that the fixing structure of the oil cooling device 100 is simple.

The second stepped portion 32 is arc-shaped in the axial direction of the oil guiding ring 10, so that the first stepped portion 31 and the second stepped portion 32 form a space in the axial extending direction of the oil guiding ring 10, the oil cooling device 100 can be conveniently fixed on the end cover 7 of the motor, the structure is compact after the fixation, and the space utilization rate of the inside of the motor is improved.

Referring to fig. 1 to 3, according to an embodiment of the present utility model, the motor includes the foregoing oil cooling device 100 of the motor rotor, the oil cooling device 100 includes an oil guide pipe 20 and an oil guide ring 10, one end of the oil guide pipe 20 is connected with an oil groove 3a on the motor housing 3, the other end is in an integral structure with the oil guide ring 10, the oil guide ring 10 having a central through hole is sleeved on the small half shaft 2 and is in clearance fit with the small half shaft 2, the oil cooling device 100 may further include a mounting bracket 30, and the oil cooling device 100 is fixed on an end cover 7 of the motor through the mounting bracket 30 in an integral structure with the oil guide ring 10 between the mounting. The cooling oil enters the oil cooling device 100 from the oil groove 3a of the motor housing 3, and the oil cooling device 100 guides the cooling oil to the inside of the rotor shaft. Specifically, the cooling oil enters the oil guide ring 10 from the oil guide pipe 20, flows out from the outlet of the oil guide ring 10, and enters the oil guide groove 5 between the rotating shaft 4 and the small half shaft 2 through the gap between the oil guide ring 10 and the small half shaft 2. The cooling oil is introduced into the motor shaft from the oil groove 3a through the oil cooling device 100, so that the motor shaft is cooled, meanwhile, when the small half shaft 2 and the motor rotating shaft 4 work, the cooling oil in the rotating shaft 4 circulates into the two end covers 7 plates of the rotor, and the cooling oil takes away heat on the rotor in the flowing process, so that the motor rotor is cooled. By cooling the rotor, the efficiency of the electric drive system may be improved. And the reduction of the temperature in the rotor also improves the durability of the overall drive system.

According to the motor provided by the embodiment of the utility model, the rotor cooling system is added on the basis of conventional stator oil cooling, a rotor oil cooling technology is adopted for the coaxial motor, and the cooling oil in the oil pump is introduced into the rotor through the oil cooling device 100 so as to take away the heat on the rotor, so that the efficiency of an electric drive system is improved by realizing rotor cooling, and the endurance mileage of the whole motor is improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. An oil cooling device (100) for an electric motor rotor, comprising:

the oil guide ring (10), the oil guide ring (10) is annular with a central through hole, an oil guide cavity arranged around the central through hole is formed in the oil guide ring (10), an opening (11) is formed in the inner peripheral surface of the oil guide ring (10), and the opening (11) is communicated with the oil guide cavity;

and the oil guide pipe (20) is connected with the oil guide ring (10) and is communicated with the oil guide cavity.

2. The oil cooling device (100) of an electric motor rotor according to claim 1, characterized in that the oil-guiding ring (10) comprises:

a first side plate (12), the first side plate (12) being an annular plate;

a second side plate (13), the second side plate (13) being laminated with the first side plate (12) with a gap, and the second side plate (13) being an annular plate;

-an outer plate (14), the outer plate (14) extending in the circumferential direction of the oil-guiding ring (10) and being connected to the outer peripheral edge of the first side plate (12) and the outer peripheral edge of the second side plate (13), respectively, the inner periphery of the first side plate (12) and the inner periphery of the second side plate (13) being spaced apart to open inside the oil-guiding ring (10) to form the opening (11).

3. The oil cooling device (100) of an electric motor rotor according to claim 2, characterized in that at least one of the first side plate (12), the second side plate (13) and the outer side plate (14) has a thickness in the range of 1 to 4 mm.

4. An oil cooling device (100) of an electric motor rotor according to claim 2, characterized in that the oil guide pipe (20) is connected to the outer side plate (14) and extends radially of the oil guide ring (10) towards the outside of the oil guide ring (10).

5. The oil cooling device (100) of an electric motor rotor according to claim 2, characterized in that a portion of the outer plate (14) is recessed towards the central through hole of the oil guiding ring (10) to form a relief groove (15), the relief groove (15) penetrating the oil guiding ring (10) in the axial direction of the oil guiding ring (10).

6. The oil cooling device (100) of a motor rotor according to claim 1, wherein a first limit rib (21) and a second limit rib (22) are arranged at an end portion, far away from the oil guiding ring (10), of the oil guiding pipe (20), the first limit rib (21) and the second limit rib (22) are spaced apart along the axial direction of the oil guiding pipe (20), and a seal ring accommodating groove (23) is formed between the first limit rib (21) and the second limit rib (22).

7. The oil cooling device (100) of an electric machine rotor according to claim 1, wherein the oil cooling device (100) further comprises:

and the mounting bracket (30) is connected with the oil guide ring (10) and is used for mounting the oil cooling device (100).

8. The oil cooling device (100) of an electric motor rotor according to claim 7, characterized in that the oil guiding ring (10) is a plastic ring and the mounting bracket (30) is injection-molded integrally with the oil guiding ring (10).

9. The oil cooling device (100) of a motor rotor according to claim 7, wherein the mounting bracket (30) includes a first stepped portion (31), a second stepped portion (32) and a third stepped portion (33), the first stepped portion (31) is connected to the oil guiding ring (10), the first stepped portion (31) and the third stepped portion (33) have a pitch in an axial direction of the oil guiding ring (10), and the second stepped portion (32) is connected between the first stepped portion (31) and the second stepped portion (32), and the second stepped portion (32) is arc-shaped plate-like in a circumferential direction of the oil guiding ring (10), the first stepped portion (31) has a bead extending in a radial direction of the oil guiding ring (10).

10. An electric machine, characterized by an oil cooling device (100) comprising an electric machine rotor according to any one of claims 1-9.