Oil-cooled motor rotor cooling oil circuit structure and automobile

Abstract

This utility model discloses an oil-cooled motor rotor cooling oil circuit structure and an automobile, relating to the field of automotive motor structures. It includes: a cooling oil cavity disposed inside the rotor shaft, one end of which is connected to a cooling oil passage; multiple oil-throwing holes penetrating the outer peripheral sidewall of the cooling oil cavity; multiple radial grooves arranged along the radial direction of the first rotor core, with the radial grooves corresponding to the oil-throwing holes; and an axial groove structure penetrating the first rotor core, the second rotor core, and the balance end plate, with the oil inlet of the axial groove structure connected to the other end of the radial groove, and the oil outlet of the axial groove structure connected to the motor cavity. A cooling oil flow path is formed inside the motor rotor, allowing the cooling oil to flow from the cooling oil passage into the motor rotor and finally be thrown out from the balance end plate. This achieves cooling from inside the motor rotor, effectively solving the problems of low heat dissipation efficiency and low power density of existing electric vehicle drive motor rotors.

Description

Technical Field

[0001] This utility model belongs to the field of automotive motor structure, and more specifically, relates to an oil-cooled motor rotor cooling oil circuit structure and an automobile. Background Technology

[0002] With the rapid development of new energy vehicles and other fields, the requirements for the performance and reliability of motors are becoming increasingly stringent. During motor operation, the rotor generates a significant amount of heat. If this heat is not cooled effectively and promptly, it can lead to overheating, affecting the motor's performance and lifespan. Traditional motor cooling methods primarily include air cooling and water cooling, but these methods have limited effectiveness in some high-power-density motors. Oil cooling technology, as a highly efficient cooling method, presents a pressing issue for engineers to address in its application to motor cooling structures. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an oil-cooled motor rotor cooling oil circuit structure and an automobile. A cooling oil flow path is formed inside the motor rotor, allowing the cooling oil to flow into the motor rotor from the cooling oil passage and finally be thrown out from the balance end plate. This achieves cooling from inside the motor rotor, effectively solving the problems of low heat dissipation efficiency and low power density of existing electric vehicle drive motor rotors.

[0004] To achieve the above objectives, this utility model provides an oil-cooled motor rotor cooling oil circuit structure. The motor rotor includes a shaft, a first rotor core, a second rotor core, and a balance end plate. The first rotor core, the second rotor core, and the balance end plate are sequentially fitted onto the outer periphery of the shaft from the middle to both ends. The oil circuit structure includes:

[0005] A cooling oil chamber is disposed inside the rotating shaft, and one end of the cooling oil chamber is used to connect to a cooling oil passage;

[0006] Multiple oil-throwing holes are evenly distributed on the outer peripheral sidewall of the cooling oil cavity, and the oil-throwing holes are disposed through the sidewall of the rotating shaft.

[0007] Multiple radial slots are arranged along the radial direction of the first rotor core, and one end of each radial slot corresponds to the oil slinger hole.

[0008] An axial groove structure is provided through the first rotor core, the second rotor core, and the balance end plate. The direction of the axial groove structure is parallel to the axis of the rotating shaft. The oil inlet of the axial groove structure is connected to the other end of the radial groove, and the oil outlet of the axial groove structure is connected to the motor cavity.

[0009] Preferably, the axial groove structure includes:

[0010] Multiple pairs of first axial slots are disposed through the first rotor core, and each pair of first axial slots is connected to one of the radial slots.

[0011] Multiple second axial slots are disposed through the second rotor core, and the second axial slots are disposed corresponding to the first axial slots.

[0012] Multiple third axial grooves are disposed through the balance end plate, and the third axial grooves are disposed corresponding to the second axial grooves.

[0013] Preferably, two connecting grooves are provided between each radial groove and each pair of first axial grooves, the connecting grooves and the first axial grooves are configured in a one-to-one correspondence, and the two connecting grooves and the radial grooves are configured in a Y-shape.

[0014] Preferably, each pair of the first axial grooves is symmetrically arranged on both sides of the radial groove, and each pair of the first axial grooves is arranged in a figure-eight shape.

[0015] Preferably, the first axial groove, the second axial groove, and the third axial groove are centered.

[0016] Preferably, the first axial groove and the second axial groove have the same cross-sectional area, and the cross-sectional area of ​​the second axial groove is larger than that of the third axial groove.

[0017] Preferably, the first rotor core, the second rotor core, and the balance end plate are annular components of the same size.

[0018] Preferably, the first rotor core, the second rotor core, and the balance end plate are all interference fit with the rotating shaft.

[0019] Preferably, one end of the rotating shaft is provided with a snap-fit ​​flange along the circumferential direction, and the snap-fit ​​flange is in contact with the balance end plate.

[0020] This utility model also provides an automobile, including the above-mentioned oil-cooled motor rotor cooling oil circuit structure, one end of the cooling oil passage is disposed outside the motor, the cooling oil passage runs through the motor housing, and the other end of the cooling oil passage is connected to the cooling oil cavity.

[0021] This utility model provides an oil-cooled motor rotor cooling oil circuit structure and an automobile. Its beneficial effects are as follows: The cooling oil circuit structure has cooling oil flow paths opened in the shaft, the first rotor core, the second rotor core, and the balance end plate. The flow paths are connected to form a cooling channel. When the motor rotor rotates, the shaft discharges the cooling oil into the radial groove through the oil throwing hole. Then, the cooling oil flows through the first axial groove, the second axial groove, and the third axial groove in sequence to achieve internal cooling of the motor rotor. In addition, the axial groove structure includes multiple axial flow paths, which can increase the contact area between the motor rotor and the cooling oil, improve the heat dissipation effect of the motor, and also ensure the compact structure, small weight, and high power density of the motor.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0024] Figure 1 A schematic diagram of a cooling oil circuit structure for an oil-cooled motor rotor according to an embodiment of the present invention is shown.

[0025] Figure 2 A schematic diagram of the internal structure of a first rotor core according to an embodiment of the present invention is shown.

[0026] Figure 3 A schematic diagram of the internal structure of a second rotor core according to an embodiment of the present invention is shown.

[0027] Figure 4 A schematic diagram of the internal structure of a balance end plate according to an embodiment of the present invention is shown.

[0028] Figure 5 A schematic diagram of the flow path of cooling oil between the shaft and the first rotor core according to an embodiment of the present invention is shown.

[0029] Figure 6 A schematic diagram of the flow path of cooling oil in the first rotor core according to an embodiment of the present invention is shown.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Shaft; 2. First rotor core; 3. Second rotor core; 4. Balance end plate; 5. Cooling oil chamber; 6. Oil slinger hole; 7. Radial groove; 8. First axial groove; 9. Second axial groove; 10. Third axial groove; 11. Connecting groove. Detailed Implementation

[0032] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] like Figure 1 As shown, this utility model provides a cooling oil circuit structure for an oil-cooled motor rotor. The motor rotor includes a shaft 1, a first rotor core 2, a second rotor core 3, and a balance end plate 4. The first rotor core 2, the second rotor core 3, and the balance end plate 4 are sequentially fitted onto the outer periphery of the shaft 1 from the middle to both ends. The oil circuit structure includes:

[0034] The cooling oil chamber 5 is located inside the rotating shaft 1, and one end of the cooling oil chamber 5 is used to connect with the cooling oil passage.

[0035] Multiple oil-throwing holes 6 are evenly distributed on the outer peripheral sidewall of the cooling oil chamber 5, and the oil-throwing holes 6 are disposed through the sidewall of the rotating shaft 1.

[0036] Multiple radial grooves 7 are arranged along the radial direction of the first rotor core 2, with one end of each radial groove 7 corresponding to an oil slinger hole 6.

[0037] An axial groove structure is installed through the first rotor core 2, the second rotor core 3, and the balance end plate 4. The direction of the axial groove structure is parallel to the axis of the rotating shaft 1. The oil inlet of the axial groove structure is connected to the other end of the radial groove 7, and the oil outlet of the axial groove structure is connected to the motor cavity.

[0038] Specifically, the cooling oil structure is located inside the motor rotor. The motor rotor contains a rotatable shaft 1, a first rotor core 2, a second rotor core 3, and a balance end plate 4, all fitted around the outer circumference of the shaft 1. The shaft 1 has a cooling oil chamber 5, which introduces cooling oil from the cooling oil channels into the center of the rotating motor rotor. As the motor rotor rotates, the cooling oil in the cooling oil chamber 5 generates centrifugal force, causing the cooling oil to enter the first rotor core 2 through the oil slinger 6. It then flows from the inner end of the radial groove 7 within the first rotor core 2 to the outer end, entering the axial groove structure within the first rotor core 2. Because the first rotor core... The core 2 is centrally located on the outer periphery of the rotating shaft 1. Two second rotor cores 3 are respectively located on both sides of the first rotor core 2. Two balance end plates 4 are respectively located on the sides of the two second rotor cores 3 that are far apart from each other. In this way, the cooling oil entering the axial groove structure will flow from the central first rotor core 2 to the balance end plates 4 on both sides. During the flow process in the axial groove structure, the cooling oil absorbs heat from the inside of the motor rotor and finally flows out from the part of the axial groove structure located on the balance end plate 4. In this way, the cooling oil is always in a state of flow in the motor rotor, which can continuously carry away the heat dissipated by the motor rotor, thereby achieving the effect of cooling the motor rotor.

[0039] In one embodiment, a rotary joint is provided at the connection between the cooling oil passage and the rotating shaft 1, so that the cooling oil in the oil passage can be continuously fed into the rotating shaft 1 during the rotation process.

[0040] like Figures 2 to 4 As shown, the axial groove structure includes:

[0041] Multiple pairs of first axial slots 8 are disposed through the first rotor core 2, and each pair of first axial slots 8 is connected to a radial slot 7.

[0042] Multiple second axial grooves 9 are provided through the second rotor core 3, and the second axial grooves 9 are provided in correspondence with the first axial grooves 8.

[0043] Multiple third axial grooves 10 are disposed through the balance end plate 4, and the third axial grooves 10 are disposed corresponding to the second axial grooves 9.

[0044] Specifically, the axial groove structure is formed through the first rotor core 2, the second rotor core 3, and the balance end plate 4, and the axial groove structure is parallel to the axis of the rotating shaft 1. Multiple pairs of first axial grooves 8 are arranged circumferentially on the first rotor core 2, and each pair of first axial grooves 8 is connected to a radial groove 7. This allows cooling oil entering the radial groove 7 to enter the axial groove structure and flow parallel to the axis in the motor rotor, thereby absorbing the heat generated in the first rotor core 2, the second rotor core 3, and the balance end plate 4. Similarly, multiple axial grooves are arranged circumferentially on the second rotor core 3. The second axial groove 9, each of which can connect to a first axial groove 8, ensures that the cooling oil in the rotating shaft 1 is constantly subjected to centrifugal force due to the continuous rotation of the shaft 1. This causes the cooling oil to flow towards the radial groove 7 and the axial groove structure, thus directing the cooling oil in the first axial groove 8 towards the second axial groove 9. Multiple third axial grooves 10 are circumferentially arranged on the balance end plate 4, corresponding one-to-one with the second axial grooves 9. The cooling oil in the second axial groove 9 flows into the third axial groove 10 and is ultimately sprayed into the motor cavity from the third axial groove 10. During the rotation of the motor rotor, the cooling oil, due to centrifugal force, enters the first rotor core 2 from the rotating shaft 1. Under the continuous application of centrifugal force, the cooling oil passes sequentially through the radial groove 7 and the axial groove structure. The radial groove 7 and the axial groove structure have multiple flow paths circumferentially on the motor rotor, increasing the contact area between the cooling oil and the motor rotor and improving the heat dissipation effect of the motor rotor.

[0045] like Figure 2 As shown, two connecting grooves 11 are provided between each radial groove 7 and each pair of first axial grooves 8. The connecting grooves 11 and the first axial grooves 8 are arranged in a one-to-one correspondence. The two connecting grooves 11 and the radial grooves 7 are arranged in a Y-shape.

[0046] Preferably, each pair of first axial grooves 8 is symmetrically arranged on both sides of the radial groove 7, and each pair of first axial grooves 8 is arranged in a figure-eight shape.

[0047] Specifically, in the first rotor core 2, each radial slot 7 delivers cooling oil to the two first axial slots 8 via two connecting slots 11. The cooling oil in the first axial slots 8 then flows outward along the axis of the shaft 1. In this way, the cooling oil penetrates the entire motor rotor, dissipating heat from within the rotor. The two connecting slots 11 and the radial slots 7 are designed in a Y-shape, which allows the cooling oil to be evenly distributed into the two connecting slots 11 and ultimately flow into the two symmetrically arranged first axial slots 8, achieving the same heat dissipation effect and preventing uneven heat dissipation caused by different flow rates along each cooling oil path on the motor rotor, thus avoiding localized deformation of the motor rotor.

[0048] Preferably, the first axial groove 8, the second axial groove 9, and the third axial groove 10 are centered.

[0049] Preferably, the first axial groove 8 and the second axial groove 9 have the same cross-sectional area, and the cross-sectional area of ​​the second axial groove 9 is larger than the cross-sectional area of ​​the third axial groove 10.

[0050] Specifically, during the flow of cooling oil in the axial groove structure, it first passes through the first axial groove 8 and the second axial groove 9 with the same cross-sectional area, and then passes through the third axial groove 10 with a smaller cross-sectional area. As the orifice of the cooling oil flow is reduced, the pressure of the cooling oil is increased. Thus, when the cooling oil is sprayed from the third axial groove 10 into the motor cavity, the spray pressure of the cooling oil increases, and the spray range of the cooling oil in the motor cavity increases, thereby increasing the cooling effect on the motor cavity.

[0051] Preferably, the first rotor core 2, the second rotor core 3, and the balance end plate 4 are annular components of the same size.

[0052] Preferably, the first rotor core 2, the second rotor core 3, and the balance end plate 4 are all interference fits with the rotating shaft 1.

[0053] Specifically, the first rotor core 2, the second rotor core 3, and the balance end plate 4 are all fitted and fixed on the rotating shaft 1. Since the parts are interference fit, this ensures that the connection position of the rotor core and the balance end plate 4 with the rotating shaft 1 is stable, ensuring that the first rotor core 2, the second rotor core 3, and the balance end plate 4 will not rotate relative to each other on the rotating shaft 1, so that the cooling oil flow channel in the axial groove structure remains unobstructed. In this way, the rotating motor rotor can be continuously cooled by flowing cooling oil.

[0054] Preferably, one end of the rotating shaft is provided with a snap-fit ​​flange along the circumferential direction, and the snap-fit ​​flange is in contact with the balance end plate.

[0055] Specifically, when the first rotor core 2, the second rotor core 3, and the balance end plate 4 are assembled on the rotating shaft 1, one side of the balance end plate 4 needs to be attached to the snap-fit ​​flange of the rotating shaft 1. Then, the first rotor core 2, the second rotor core 3, and the balance end plate 4 are installed in sequence to ensure the accurate radial position of each component. This also ensures that the radial groove 7 of the first rotor core 2 and the oil slinger hole 6 on the rotating shaft 1 are on the same plane. Finally, by rotating and adjusting the first rotor core 2, the oil slinger hole 6 and the radial groove 7 can be connected.

[0056] like Figures 5 to 6 As shown, this utility model also provides an automobile, including the above-mentioned oil-cooled motor rotor cooling oil circuit structure, one end of the cooling oil passage is disposed outside the motor, the cooling oil passage is disposed through the motor housing, and the other end of the cooling oil passage is connected to the cooling oil cavity 5.

[0057] Specifically, when a motor rotor with this cooling oil circuit structure is applied to an automobile, after the car is started, the shaft 1 begins to rotate, simultaneously driving the first rotor core 2, the second rotor core 3, and the balance end plate 4 on the outer periphery of the shaft 1 to rotate together. Additionally, the cooling oil passages outside the motor deliver cooling oil to the shaft 1. During the rotation of the shaft 1, an oil film forms on the inner wall of the cooling oil chamber 5 of the shaft 1. The cooling oil can then enter the radial groove 7 of the first rotor core 2 through the oil slinger hole 6. The cooling oil is then distributed through the radial groove 7 to the two connecting grooves 11, and finally enters the first axial... In groove 8, under the action of centrifugal force, the cooling oil passes through the second axial groove 9 and the third axial groove 10 in sequence. During the flow of the cooling oil, the heat generated by the rotating shaft 1, the first rotor core 2, the second rotor core 3 and the balance end plate 4 is absorbed into the cooling oil, thereby cooling the motor rotor. Finally, the cooling oil is thrown out from the third axial groove 10 on the balance end plate 4 and sprayed into the motor cavity. In summary, this is the cooling process of the motor rotor by the cooling oil through the cooling oil circuit structure. With the continuous entry of cooling oil, it can be ensured that the motor rotor temperature will not be too high.

[0058] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A rotor cooling oil circuit structure for an oil-cooled motor, characterized in that, The motor rotor includes a shaft, a first rotor core, a second rotor core, and a balance end plate. The first rotor core, the second rotor core, and the balance end plate are sequentially fitted onto the outer circumference of the shaft from the middle to both ends. The oil circuit structure includes: A cooling oil chamber is disposed inside the rotating shaft, and one end of the cooling oil chamber is used to connect to a cooling oil passage; Multiple oil-throwing holes are evenly distributed on the outer peripheral sidewall of the cooling oil cavity, and the oil-throwing holes are disposed through the sidewall of the rotating shaft. Multiple radial slots are arranged along the radial direction of the first rotor core, and one end of each radial slot is connected to the oil slinger hole. An axial groove structure is provided through the first rotor core, the second rotor core, and the balance end plate. The direction of the axial groove structure is parallel to the axis of the rotating shaft. The oil inlet of the axial groove structure is connected to the other end of the radial groove, and the oil outlet of the axial groove structure is connected to the motor cavity.

2. The oil-cooled motor rotor cooling oil circuit structure according to claim 1, characterized in that, The axial groove structure includes: Multiple pairs of first axial slots are disposed through the first rotor core, and each pair of first axial slots is connected to one of the radial slots. Multiple second axial slots are disposed through the second rotor core, and the second axial slots are disposed corresponding to the first axial slots. Multiple third axial grooves are disposed through the balance end plate, and the third axial grooves are disposed corresponding to the second axial grooves.

3. The oil-cooled motor rotor cooling oil circuit structure according to claim 2, characterized in that, Two connecting slots are provided between each radial slot and each pair of first axial slots. The connecting slots are configured in a one-to-one correspondence with the first axial slots, and the two connecting slots are configured in a Y-shape with the radial slots.

4. The oil-cooled motor rotor cooling oil circuit structure according to claim 3, characterized in that, Each pair of the first axial grooves is symmetrically arranged on both sides of the radial groove, and each pair of the first axial grooves is arranged in a figure-eight shape.

5. The oil-cooled motor rotor cooling oil circuit structure according to claim 2, characterized in that, The first axial groove, the second axial groove, and the third axial groove are centered.

6. The oil-cooled motor rotor cooling oil circuit structure according to claim 5, characterized in that, The first axial groove and the second axial groove have the same cross-sectional area, and the cross-sectional area of ​​the second axial groove is larger than that of the third axial groove.

7. The oil-cooled motor rotor cooling oil circuit structure according to claim 1, characterized in that, The first rotor core, the second rotor core, and the balance end plate are all ring-shaped components of the same size.

8. The oil-cooled motor rotor cooling oil circuit structure according to claim 1, characterized in that, The first rotor core, the second rotor core, and the balance end plate are all interference fit with the shaft.

9. The oil-cooled motor rotor cooling oil circuit structure according to claim 1, characterized in that, One end of the rotating shaft is provided with a snap-fit ​​flange along the circumferential direction, and the snap-fit ​​flange is in contact with the balance end plate.

10. A car, characterized in that, The oil-cooled motor rotor cooling oil circuit structure according to any one of claims 1-9 includes a cooling oil passage with one end located outside the motor and the cooling oil passage extending through the motor housing, and the other end of the cooling oil passage communicating with the cooling oil cavity.

Images