CN220107678U

CN220107678U - Oil-cooled motor and oil ring and vehicle thereof

Info

Publication number: CN220107678U
Application number: CN202321689630.5U
Authority: CN
Inventors: 何晨翔; 张飞
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2023-11-28
Anticipated expiration: 2033-06-29

Abstract

The utility model relates to an oil cooling motor and oil ring, vehicle thereof, the oil ring has the mating surface that is used for with stator core looks butt, follows the circumference of mating surface the oil ring has a plurality of oil pockets, adjacent two form the fit clearance between the oil pocket, the oil ring be equipped with inlet port and the oil jet that the oil pocket is linked together, wherein, the inlet port is located on the mating surface and be used for with stator core's oil duct is linked together, the oil jet sets up on the inner wall of oil pocket towards stator winding. In the oil ring provided by the disclosure, a cooling medium for cooling the stator core can enter the oil ring, and the cooling medium can be sprayed to the whole periphery of the stator winding to completely surround the stator winding, so that the cooling effect and the cooling uniformity of the stator winding are ensured. The oil ring can be directly fixed on the end face of the stator core through the assembly gap, a sealing piece is not required to be arranged, and the assembly process is simplified.

Description

Oil-cooled motor and oil ring and vehicle thereof

Technical Field

The disclosure relates to the technical field of motor cooling, in particular to an oil-cooled motor, an oil ring thereof and a vehicle.

Background

Along with the continuous development of new energy automobiles and the gradual improvement of the driving capability requirements of the new energy automobiles in the market, the driving motor of the new energy automobiles is required to continuously improve the rotating speed, the torque density and the power density on the premise that the volume is gradually compressed. The higher the rotation speed, torque density and power density of the driving motor, the higher the heat generated by the driving motor, so that the heat dissipation and cooling structure of the driving motor is essential for reliable, stable and efficient operation of the motor.

Cooling of the drive motor can be classified into air cooling, water cooling and oil cooling. The traditional motor is cooled by water, and few low-performance motors are cooled by economical air. The water cooling scheme has certain defects because the cooling water belongs to indirect cooling and cannot directly contact with the heat dissipation part. The oil cooling scheme is becoming the first choice of a high-performance motor cooling scheme by virtue of the advantages of natural electrical insulation, high freedom of structural design and the like.

In the related art, an oil cavity is formed by the oil ring, the shell and the stator core in the oil-cooled motor, and the integral tightness cannot be ensured. The oil ring is arranged at the end part of the stator core, the sealing gasket is arranged between the oil ring and the stator core, the sealing gasket generally adopts a metal framework and an injection molding sealing ring, the cost is high, the oil ring is required to be matched with peripheral parts, and the oil ring is tightly pressed on the stator core, so that the oil way is sealed, and the assembly is inconvenient.

Disclosure of Invention

In order to overcome the problems in the related art, the present disclosure provides an oil-cooled motor, an oil ring thereof, and a vehicle.

According to a first aspect of the embodiments of the present disclosure, there is provided an oil ring of an oil-cooled motor, the oil ring having a mating surface for abutting against a stator core, the oil ring having a plurality of oil chambers in a circumferential direction of the mating surface, an assembly gap being formed between two adjacent oil chambers, the oil ring being provided with an oil inlet hole communicating with the oil chambers and an oil injection hole, wherein the oil inlet hole is provided on the mating surface and for communicating with an oil passage of the stator core, and the oil injection hole is provided on an inner wall of the oil chamber facing a stator winding.

Optionally, the oil ring includes an oil ring body, one end of the oil ring body is closed, the other end forms an opening and is closed by an end cover, the end cover is a plurality of the oil ring body and the end cover are arranged at intervals about the assembly gap, the oil ring body and the end cover form the oil cavity, and one closed end of the oil ring body forms the mating surface.

Optionally, a mounting hole is formed in the position, corresponding to the assembly gap, of the mating surface, and the oil ring is fixed on the end face of the stator core through a fastener penetrating through the mounting hole.

Optionally, at least one oil inlet hole is respectively arranged on two sides of the mounting hole.

Alternatively, the oil jet is provided on an inner peripheral wall of the oil ring and is provided on a side away from the mating surface in the axial direction.

Optionally, the oil inlet is a strip hole matched with the shape of the oil duct, and the oil spraying holes are a plurality of oil spraying holes arranged at intervals along the circumferential direction.

Optionally, the oil ring body is integrally injection molded, and the plurality of end caps are welded and fixed on the end surfaces of the oil ring body respectively.

Optionally, a reinforcing portion extending radially inward is provided on the mating surface at a position corresponding to the fitting clearance.

According to a second aspect of the embodiments of the present disclosure, there is provided an oil-cooled motor, including a stator core and a stator winding, both ends of the stator core being provided with the oil rings of the oil-cooled motor described above, respectively.

According to a third aspect of embodiments of the present disclosure, there is provided a vehicle comprising the oil-cooled motor described above.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: in the oil ring provided by the disclosure, a cooling medium for cooling the stator core can enter the oil ring, and the cooling medium can be sprayed to the whole periphery of the stator winding to completely surround the stator winding, so that the cooling effect and the cooling uniformity of the stator winding are ensured. The oil ring can be directly fixed on the end face of the stator core through the assembly gap, a sealing piece is not required to be arranged, and the assembly process is simplified.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 and 2 are schematic structural views of an oil ring according to an exemplary embodiment.

Fig. 3 is an exploded view of an oil ring according to an exemplary embodiment.

Fig. 4 is a partial structural schematic diagram of an oil ring according to an exemplary embodiment.

Fig. 5 is a schematic diagram showing a structure of a driving motor according to an exemplary embodiment.

Fig. 6 is a partial enlarged view of a driving motor according to an exemplary embodiment.

Fig. 7 is a schematic view showing a structure of an end face of a stator core in a driving motor according to an exemplary embodiment.

Fig. 8 and 9 are schematic diagrams showing a stator core surface cooling medium flow path in a driving motor according to an exemplary embodiment.

Description of the reference numerals

1-oil ring; 100-oil ring body; 101-end caps; 10-assembly gap; 11-mating surface; 12-an oil inlet hole; 13-an oil injection hole; 14-mounting holes; 15-a connecting ring; 21-a stator core; 210-oil duct; 211-fitting holes; 22-stator windings; 3-fastener, 4-casing.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

It should be noted that, all actions of acquiring signals, information or data in the present utility model are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.

In the present disclosure, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to refer generally to the directions of the drawing figures, and "circumferential", "axial" and "radial" are defined with respect to the axis of rotation of the drive motor, with "inner" and "outer" referring to the inner and outer of the respective component profiles. The use of the terms first, second, etc. are used for the purpose of distinguishing between different elements and not necessarily for the sake of order or importance. Furthermore, in the following description, when referring to the drawings, the same reference numerals in different drawings denote the same or similar elements unless otherwise explained.

As shown in fig. 1 and 2, the present disclosure provides an oil ring of an oil-cooled motor, the oil ring 1 has a mating surface 11 for abutting against a stator core 21, the oil ring 1 has a plurality of oil chambers along a circumference of the mating surface 11, an assembly gap 10 is formed between two adjacent oil chambers, the oil ring 1 is provided with an oil inlet hole 12 and an oil injection hole 13 which are communicated with the oil chambers, wherein the oil inlet hole 12 is provided on the mating surface 11 and is for communicating with an oil passage 210 of the stator core 21, and the oil injection hole 13 is provided on an inner wall of the oil chamber facing a stator winding 22. Here, the cooling medium of the oil chamber in the oil ring 1 is not limited to oil, but may be water, a cooling liquid, or the like, and the present disclosure is not limited in any way. The number of oil chambers may be increased or decreased as desired depending on the number of installation gaps 10 provided. At the position of the assembly gap 10, the oil ring 1 may be fixed on the stator core 21 by fastening, clamping, welding, and the like, which are all within the scope of the present disclosure.

Through the above technical scheme, in the oil ring 1 provided by the present disclosure, a cooling medium for cooling the stator core 21 may enter the oil ring 1, and the cooling medium may be sprayed to the entire periphery of the stator winding 22, completely surrounding the stator winding 22, and ensuring the cooling effect and cooling uniformity for the stator winding 22. The oil ring can be directly fixed on the end face of the stator core through the assembly gap, a sealing piece is not required to be arranged, and the assembly process is simplified.

There are various ways in which the oil ring 1 is fixed to the end face of the stator core 21. In the present disclosure, as shown in fig. 2 and 4, a mounting hole 14 is opened at a position corresponding to the fitting gap 10 on the fitting surface 11, and as shown in fig. 5 and 6, the oil ring 1 is fixed to an end surface of the stator core 21 by a fastener 3 penetrating the mounting hole 14. The oil ring 1 may be made of oil-resistant and high-temperature-resistant plastic materials, such as nylon (PA), polyphthalamide (PPA), polyphenylene sulfide (PPS), etc., and the oil ring 1 is sealed with the end face of the stator core 21 by the locking force of the fastener 3, without any additional sealing measures, such as glue spreading or gasket sealing, etc. As shown in fig. 7, the mounting hole 211 may be formed at a position corresponding to the mounting hole 14 on the end surface of the stator core 21, or may be omitted, and the oil ring 1 may be fixed to the end surface of the stator core 21 by direct self-tapping screws.

The oil inlet hole 12 on the oil ring 1 is close to the mounting hole 14, for example, the oil inlet hole 12 can be respectively formed on two sides of the mounting hole 14, and the closer the oil inlet hole 12 is arranged to the mounting hole 14, the more tightness of the oil inlet hole 12 can be ensured, and oil leakage is avoided. The position of the oil inlet hole 12 may be designed according to the position of the oil passage 210 of the stator core 21. The oil passage 210 and the oil inlet hole 12 may have rectangular structures, such as elongated holes, so as to ensure that the flow rate of the cooling medium meets the injection requirement.

As shown in fig. 1 and 4, the oil jet 13 is provided on the inner peripheral wall of the oil chamber and may be plural in a circumferentially spaced arrangement, and in the axial direction, the oil jet 13 is provided on a side away from the mating face 11. The outer Zhou Penlin cooling liquid of the stator winding 22 can be simultaneously cooled, the cooling uniformity is ensured, and the number, the size and the position of the injection areas and the oil injection holes 13 can be designed according to actual conditions.

In the present disclosure, a plurality of oil chambers may be formed in various ways. As shown in fig. 2, the oil ring 1 includes an oil ring body 100, one end of the oil ring body 100 is closed, the other end forms an opening and is closed by an end cap 101, the end cap 101 may be a plurality of spaced apart with respect to the fitting gap 10, the oil ring body 100 and the end cap 101 form an oil chamber, and the closed end of the oil ring body 100 is formed as a mating surface 11. The oil ring body 100 may be integrally injection molded to form an oil pocket, and then a closed oil pocket is formed by welding the end cap 101. The cooling medium flowing out of the stator core 21 may enter the oil chamber, thereby cooling the stator winding 22.

In other embodiments of the present disclosure, the oil chambers of the oil ring 1 may be formed by block injection molding and then welding, as shown in fig. 4, and after the oil chambers may be formed by block injection molding, they may be welded and fixed on the connecting ring 15 to form an integral structure, and the mounting hole 14 may be formed on the connecting ring 15, so as to ensure structural strength of the mating surface 11. The position of the connecting ring 15 provided with the mounting hole 14 is provided with a reinforcing part protruding inwards along the radial direction, so that the strength of the fixed position of the oil ring 1 can be ensured, and the stability of the fixation of the oil ring 1 can be improved.

In addition, in the present disclosure, the flow path of the cooling medium on the surface of the stator core 21 is not limited to this disclosure. As shown in fig. 8, after entering the stator from the oil inlet of the casing 4, the cooling medium flows to both sides along the stator core 21, passes through the oil rings 1 on both sides, and then sprays to the entire periphery of the stator winding 22, so as to realize cooling of the stator core 21 and the stator winding 22, respectively. As shown in fig. 9, the cooling medium flows along the S-shaped flow path in the direction of the oil outlet flow channel at the other end on one side of the oil inlet, and directly flows out from the oil outlet flow channel on the other side of the oil inlet, starting from the oil inlet. The oil ring 1 provided by the present disclosure is suitable for the above-described manner, and can collect and spray the cooling medium flowing out of the stator core 21 to the stator winding 22.

According to a second aspect of the present disclosure, there is provided an oil-cooled motor including a stator core 21 and a stator winding 22, both ends of the stator core 21 being provided with the above-described oil rings 1, respectively, the oil-cooled motor having all the advantageous effects of the oil rings 1, which are not described in detail herein.

According to a third aspect of the present disclosure, there is provided a vehicle comprising the oil-cooled motor provided by the present disclosure. The vehicle can simultaneously ensure the cooling effect of the stator core 21 and the stator winding 22, the stator winding 22 and the stator core 21 are fully and uniformly cooled, the insulating high-temperature aging failure risk of a motor system is effectively reduced, and meanwhile, the power density and the torque density of the motor are improved.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An oil ring of an oil-cooled motor is characterized in that the oil ring is provided with a matching surface for abutting against a stator core, a plurality of oil cavities are arranged along the circumferential direction of the matching surface, an assembly gap is formed between two adjacent oil cavities, the oil ring is provided with an oil inlet hole and an oil injection hole which are communicated with the oil cavities,

the oil inlet hole is formed in the matching surface and is used for being communicated with an oil duct of the stator core, and the oil injection hole is formed in the inner wall, facing the stator winding, of the oil cavity.

2. The oil ring for an oil-cooled electric motor according to claim 1, characterized in that the oil ring comprises an oil ring body, one end of the oil ring body being closed, the other end being formed to be open and closed by an end cap, the end cap being a plurality of spaced apart about the fitting clearance, the oil ring body and the end cap forming the oil chamber, the closed end of the oil ring body being formed to be the mating surface.

3. The oil ring for an oil-cooled motor according to claim 1, wherein a mounting hole is provided in the mating surface at a position corresponding to the fitting clearance, and the oil ring is fixed to an end face of the stator core by a fastener passing through the mounting hole.

4. An oil ring for an oil-cooled motor according to claim 3, wherein at least one of the oil inlet holes is provided on both sides of the mounting hole, respectively.

5. The oil ring for an oil-cooled motor according to claim 1, wherein the oil spray hole is provided on an inner peripheral wall of the oil ring and is provided on a side away from the mating surface in an axial direction.

6. The oil ring of an oil-cooled motor according to claim 1, wherein the oil inlet hole is a long-strip hole matching with the oil passage in shape, and the oil spray holes are a plurality of oil spray holes arranged at intervals along the circumferential direction.

7. The oil ring for an oil-cooled motor according to claim 2, wherein the oil ring body is integrally injection-molded, and a plurality of the end caps are welded and fixed to end faces of the oil ring body, respectively.

8. An oil ring for an oil-cooled motor as claimed in claim 1, wherein the mating surface is provided with a reinforcing portion extending radially inward at a position corresponding to the fitting clearance.

9. An oil-cooled motor, characterized by comprising a stator, wherein the stator comprises a stator core and a stator winding, and oil rings of the oil-cooled motor are respectively arranged at two ends of the stator core.

10. A vehicle comprising the oil-cooled motor of claim 9.