CN219247566U

CN219247566U - Motor rotor oil cooling structure and motor vehicle

Info

Publication number: CN219247566U
Application number: CN202223601343.2U
Authority: CN
Inventors: 吴承涛; 解杨华; 汪训定; 彭俊祥; 毛宇航; 吴元强
Original assignee: Zhejiang Zero Run Technology Co Ltd; Zhejiang Lingsheng Power Technology Co Ltd
Current assignee: Zhejiang Zero Run Technology Co Ltd; Zhejiang Lingsheng Power Technology Co Ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-23
Anticipated expiration: 2032-12-30

Abstract

The utility model discloses an oil cooling structure of a motor rotor, which comprises a rotor iron core and a motor shaft, wherein the motor shaft is configured into a hollow structure along the axial direction of the motor shaft to form an oil conveying channel for conveying cooling oil, the oil conveying channel is at least provided with an oil inlet end for introducing the cooling oil, a first oil outlet and a second oil outlet which are communicated with the rotor iron core are arranged on the inner wall of the oil conveying channel along the radial direction of the motor shaft in a penetrating way, the first oil outlet and the second oil outlet are arranged at intervals along the axial direction of the motor shaft, and the second oil outlet is positioned between the first oil outlet and the oil inlet end; the minimum inner diameter of the second oil outlet is configured to be smaller than the minimum inner diameter of the first oil outlet to balance the amount of oil entering the first oil outlet per unit time. Also discloses a motor vehicle provided with the motor rotor oil cooling structure. The oil quantity through the first oil outlet and the second oil outlet is more even, and the cooled more balanced of rotor core avoids appearing local overheated condition.

Description

Motor rotor oil cooling structure and motor vehicle

Technical Field

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

Background

When the rotor of the motor works, heat is generated due to high-speed rotation, and the heat must be timely discharged, otherwise the working state and the service life of the motor are affected. The common motor cooling modes are air cooling and liquid cooling, and the heat capacity of oil is large, so that the motor is usually used for cooling a motor rotor. In the prior art, cooling oil is generally conveyed to the rotor through the motor shaft penetrating through the rotor, a plurality of oil outlets are formed in the motor shaft, and when the motor shaft rotates, the cooling oil can be thrown into the rotor through the oil outlets, but with the improvement of the rotating speed, the oil quantity passing through the oil outlets in the motor shaft can be distributed unevenly, and the cooling oil can be preferentially distributed to the oil outlets closer to the oil inlet end, so that the rotor is unevenly cooled, and the local position of the rotor can be invalid due to overheating.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide an oil cooling structure of a motor rotor and a motor vehicle.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the motor rotor oil cooling structure comprises a rotor iron core and a motor shaft, wherein the motor shaft is configured into a hollow structure along the axial direction of the motor shaft to form an oil conveying channel for conveying cooling oil, the oil conveying channel is provided with at least one oil inlet end for introducing the cooling oil, a first oil outlet and a second oil outlet which are communicated with the rotor iron core are arranged on the inner wall of the oil conveying channel along the radial direction of the motor shaft in a penetrating manner, the first oil outlet and the second oil outlet are arranged at intervals along the axial direction of the motor shaft, and the second oil outlet is positioned between the first oil outlet and the oil inlet end; the minimum inner diameter of the second oil outlet is configured to be smaller than the minimum inner diameter of the first oil outlet so as to balance the amount of oil entering the first oil outlet in unit time. Through the first oil outlet with the oil mass of second oil outlet is more even, and rotor core refrigerated more balanced avoids appearing local overheated condition.

Preferably, the second oil outlet hole includes an outer hole section and an inner hole section, and an inner diameter of the inner hole section is smaller than an inner diameter of the second oil outlet hole to reduce an amount of oil entering the first oil outlet hole.

Preferably, the inner diameter of the outer hole section is larger than the inner diameter of the inner hole section so as to increase the oil inlet amount of the outer hole section, and the phenomenon that the local cooling of the rotor is influenced due to too little cooling oil amount passing through the second oil outlet is avoided.

Preferably, the second oil outlet is configured as a T-shaped hole, and the outer hole section and the inner hole section are both configured as circular through holes, so that the second oil outlet is convenient to process and cost-saving.

Preferably, the second oil outlet hole is configured as a tapered hole whose inner diameter gradually increases in a direction away from the oil delivery passage so that the amount of oil entering the second oil outlet hole gradually increases from inside to outside, avoiding that the amount of cooling oil passing through the second oil outlet hole is insufficient to cool the rotor.

Preferably, the inner hole section and the outer hole section are integrally arranged to avoid oil leakage, and the processing is more labor-saving.

Preferably, the second oil outlet holes are uniformly distributed along the circumferential direction of the motor shaft to uniformly cool each position of the rotor core.

Preferably, the first oil outlet holes are uniformly distributed along the circumferential direction of the motor shaft to uniformly cool each position of the rotor core.

Preferably, the first oil outlet hole is configured as a circular through hole for easy processing.

In order to solve the technical problems, the utility model also adopts the following technical scheme: a motor vehicle comprising an electric machine rotor oil-cooled structure as claimed in any one of the preceding claims.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

the first oil outlet and the second oil outlet are arranged in the oil conveying channel to convey cooling oil into the rotor iron core, and the cooling oil firstly passes through the first oil outlet and then passes through the second oil outlet.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present utility model and are not limiting of the present utility model.

FIG. 1 is a schematic view of a motor shaft according to the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is an enlarged schematic view at B in FIG. 2;

FIG. 5 is a radial cross-sectional view of the motor shaft of the present utility model along the second oil outlet hole;

fig. 6 is a radial sectional view of the motor shaft of the present utility model along the first oil outlet hole.

Reference numerals:

1. a motor shaft; 11. an oil delivery passage; 111. a first oil outlet hole; 112. a second oil outlet hole; 1121. an outer bore section; 1122. an inner bore section; 12. an oil inlet end; 2. and a rotor core.

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.

Embodiments of the present utility model are described below with reference to the accompanying drawings.

Examples:

referring to fig. 1 and 2, the present utility model provides an oil cooling structure of a motor rotor, including a rotor core 2 and a motor shaft 1, wherein the motor shaft 1 is configured as a hollow structure along an axial direction thereof to form an oil delivery channel 11 for cooling the rotor core 2, in this embodiment, the oil delivery channel 11 has an oil inlet end 12 for introducing cooling oil, in other embodiments, the oil delivery channel 11 may also have a plurality of oil inlet ends 12 for introducing cooling oil, and a first oil outlet hole 111 and a second oil outlet hole 112 which are communicated with the rotor core 2 are radially penetrating through an inner wall of the oil delivery channel 11; the first oil outlet hole 111 and the second oil outlet hole 112 are disposed at intervals along the axial direction of the motor shaft 1, and the second oil outlet hole 112 is located between the first oil outlet hole 111 and the oil inlet end 12, and the minimum inner diameter of the second oil outlet hole 112 is configured to be smaller than the minimum inner diameter of the first oil outlet hole 111 for balancing the amount of oil that enters the first oil outlet hole 111 per unit time. Referring to fig. 3 and 4, specifically, the second oil outlet 112 includes an outer hole section 1121 and an inner hole section 1122, and the inner hole section 1122 has an inner diameter smaller than that of the first oil outlet 111.

In this embodiment, the second oil outlet 112 is closer to the oil inlet end 12 than the first oil outlet 111, the cooling oil (which may also have a lubricating effect) introduced into the oil delivery channel 11 is sequentially thrown into the rotor core 2 through the second oil outlet 112 and the first oil outlet 111 to cool the rotor core 2 when the motor shaft 1 rotates, the second oil outlet 112 includes an inner hole section 1122 and an outer hole section 1121, the inner and outer positions of which are relative to the oil delivery channel 11, the inner hole section 1122 is disposed close to the oil delivery channel 11, the outer hole section 1121 is far from the oil delivery channel 11, the cooling oil enters the inner hole section 1122 and then enters the outer hole section 1121, the minimum inner diameter of the inner hole section 1122 is smaller than the minimum inner diameter of the first oil outlet 111, so that the cooling oil distributed to the second oil outlet 112 is reduced, and the oil amount entering the first oil outlet 111 is increased. Thus, even if the motor shaft 1 rotates at a medium-high rotational speed, the cooling oil is uniformly distributed to the first oil outlet hole 111 and the second oil outlet hole 112, and the rotor core 2 is cooled more uniformly.

The inner diameter of the outer hole section 1121 is larger than the inner diameter of the inner hole section 1122, so that the oil inlet amount of the outer hole section 1121 is increased, and the cooling effect on the rotor core 2 is prevented from being influenced by too little cooling oil entering the second oil outlet 112.

Referring to fig. 5, the second oil outlet 112 is configured as a T-shaped hole, and the outer hole section 1121 and the inner hole section 1122 are configured as circular, square or rectangular through holes. In the embodiment, the outer hole section 1121 and the inner hole section 1122 are both configured as circular through holes, which is convenient for processing and has low cost; of course, combinations of circular through holes for the outer hole segments 1121, square through holes for the inner hole segments 1122, or square through holes for the outer hole segments 1121, square through holes for the inner hole segments 1122, and the like are also contemplated as falling within the scope of the present application.

In another embodiment, the second oil outlet 112 is configured as a tapered hole whose inner diameter gradually increases in a direction away from the oil delivery passage 11 such that the amount of oil entering the second oil outlet 112 gradually increases from inside to outside, and the closer to the oil delivery passage 11, the smaller the space of the second oil outlet 112 accommodating the cooling oil is to equalize the amounts of oil entering the first oil outlet 111 and the second oil outlet 112.

The inner hole section 1122 and the outer hole section 1121 are integrally formed to prevent oil leakage from the second oil outlet 112 due to the presence of a gap, and the integrally formed structure is also more convenient for processing.

In the present embodiment, the second oil outlet holes 112 are uniformly distributed along the circumferential direction of the motor shaft 1, and the first oil outlet holes 111 are uniformly distributed along the circumferential direction of the motor shaft 1, so that the motor shaft 1 can uniformly throw cooling oil toward the rotor core 2 when rotating. Specifically, the motor shaft 1 is uniformly distributed with three first oil outlet holes 111 and three second oil outlet holes 112 in the circumferential direction.

Referring to fig. 6, the first oil outlet hole 111 is configured as a circular, square or rectangular through hole, and in this embodiment, the first oil outlet hole 111 is a circular through hole, so that the processing cost is low and the processing mode is simple.

The oil delivery passages 11 are symmetrically arranged along the central axis of the motor shaft 1 to make the oil amount inputted to the first oil outlet 111 and the second oil outlet 112 uniform, and also make the motor shaft 1 more balanced and stable in operation.

The rotor core 2 is formed by laminating a plurality of rotor punching sheets so as to reduce the eddy current loss of the rotor core 2, reduce the overall temperature of the rotor core 2 and prevent the rotor core 2 from losing efficacy due to overheating in the operation process.

In the present utility model, unless explicitly stated or limited otherwise in the examples, the terms "mounted," "connected," and "fixed" as used in the examples should be interpreted broadly, e.g., the connection may be a fixed connection, may be a removable connection, or may be integral, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. 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 specific embodiments.

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

1. The utility model provides a motor rotor oil cooling structure, includes rotor core (2) and motor shaft (1), motor shaft (1) is in order to form in its axial configuration hollow structure in order to form oil delivery passageway (11) that are used for carrying the cooling oil, oil delivery passageway (11) have at least one oil feed end (12) that are used for letting in the cooling oil, the inner wall of oil delivery passageway (11) is along the radial run-through of motor shaft (1) be provided with first oil outlet (111) and second oil outlet (112) with rotor core (2) intercommunication, first oil outlet (111) and second oil outlet (112) are along the axial interval setting of motor shaft (1), and second oil outlet (112) are located between first oil outlet (111) and oil feed end (12); the oil pump is characterized in that the minimum inner diameter of the second oil outlet hole (112) is configured to be smaller than the minimum inner diameter of the first oil outlet hole (111) so as to balance the oil quantity entering the first oil outlet hole (111) and the second oil outlet hole (112) in unit time.

2. The electric machine rotor oil cooling structure according to claim 1, characterized in that the second oil outlet hole (112) includes an outer hole section (1121) and an inner hole section (1122), the inner hole section (1122) having an inner diameter smaller than that of the first oil outlet hole (111).

3. The electric machine rotor oil cooling structure of claim 2, wherein an inner diameter of the outer bore section (1121) is greater than an inner diameter of the inner bore section (1122).

4. An electric machine rotor oil cooling structure according to claim 3, characterized in that the second oil outlet hole (112) is configured as a T-shaped hole, and the outer hole section (1121) and the inner hole section (1122) are configured as circular, square or rectangular through holes.

5. The electric machine rotor oil cooling structure according to claim 2 or 3 or 4, characterized in that the inner bore section (1122) is provided integrally with the outer bore section (1121).

6. The electric motor rotor oil cooling structure according to claim 1, characterized in that the second oil outlet hole (112) is configured as a tapered hole whose inner diameter gradually increases in a direction away from the oil delivery passage (11).

7. The electric motor rotor oil cooling structure according to claim 1, characterized in that the second oil outlet holes (112) are uniformly distributed along the circumferential direction of the motor shaft (1).

8. The electric motor rotor oil cooling structure according to claim 1, characterized in that the first oil outlet holes (111) are uniformly distributed along the circumferential direction of the motor shaft (1).

9. The electric motor rotor oil cooling structure according to claim 8, characterized in that the first oil outlet hole (111) is configured as a circular, square or rectangular through hole.

10. A motor vehicle comprising an electric machine rotor oil cooling structure as claimed in any one of claims 1 to 9.