Rotor assembly, electric machine and vehicle

Abstract

This utility model discloses a rotor assembly, a motor, and a vehicle, relating to the field of oil-cooled motor technology. The rotor assembly includes: a rotor core comprising multiple stacked rotor laminations, each lamination having an oil drain hole. These drain holes are sequentially connected and used to drain cooling oil entering adjacent rotor laminations. Multiple oil drain holes are spaced apart along the circumference of the rotor laminations. An oil draining member is located at at least one end of the rotor core. The end face of the oil draining member facing the rotor core has an oil drain groove communicating with the oil drain holes. The oil drain groove includes an oil collecting recess, which is sequentially connected to the multiple oil drain holes arranged along the circumference of the rotor laminations, and is used to drain the oil from the oil drain holes to the outside of the oil draining member. This utility model solves the technical problem of inconvenient drainage of oil seeping into the rotor assembly in oil-cooled motors.

Description

[0001] This application claims priority to Chinese Patent Application No. 202421602836.4, filed on July 8, 2024, entitled "Rotor Assembly, Motor and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of oil-cooled motor technology, and in particular to a rotor assembly, a motor and a vehicle. Background Technology

[0003] Oil-cooled motors are motors that use cooling oil injected into their interior for cooling, offering advantages such as good heat dissipation and stable operation. However, during operation, due to the rotation of the rotor, the cooling oil may seep into the gaps between the rotor components, becoming trapped and gradually accumulating into stagnant oil, causing poor dynamic balance and affecting the overall NVH performance. Utility Model Content

[0004] The main purpose of this utility model is to provide a rotor assembly, a motor, and a vehicle, which aims to solve the technical problem that it is inconvenient to drain the oil that has seeped into the rotor assembly in existing oil-cooled motors.

[0005] To achieve the above objectives, this utility model provides a rotor assembly, which includes:

[0006] A rotor core comprising a plurality of stacked rotor laminations, each lamination having an oil drain hole. The oil drain holes on the plurality of rotor laminations are sequentially connected and used to drain cooling oil entering adjacent rotor laminations. The oil drain holes are spaced apart circumferentially along the rotor laminations.

[0007] An oil draining component is provided at at least one end of the rotor core. The end face of the oil draining component facing the rotor core is provided with an oil draining groove communicating with the oil draining hole. The oil draining groove includes an oil collecting recess. The oil collecting recess is sequentially connected to a plurality of oil draining holes arranged circumferentially along the rotor laminations and is used to discharge the oil from the oil draining holes to the outside of the oil draining component.

[0008] In one embodiment, the oil collecting recess is spirally wrapped around the end face of the oil discharge member and extends to the outer peripheral surface of the oil discharge member. The spiral direction of the oil collecting recess from the inner peripheral surface of the oil discharge member to the outer peripheral surface of the oil discharge member is in the same direction as the rotation direction of the rotor core.

[0009] Alternatively, the oil drain groove may further include an oil drain recess, which is connected to the oil collection recess. One end of the oil drain recess extends to the outer peripheral surface of the oil draining component, and the curvature of the oil collection recess is different from that of the oil drain recess.

[0010] In one embodiment, each of the oil drain holes at least partially overlaps with the oil collection recess.

[0011] In one embodiment, the oil draining component is configured as an end ring, which is located at the end of the rotor core.

[0012] In one embodiment, the oil discharge component is configured as a dynamic balancing plate, which is located at the end of the rotor core.

[0013] In one embodiment, the dynamic balancing plate is provided with weight reduction holes, and the oil drain groove is offset from the weight reduction holes.

[0014] In one embodiment, the rotor assembly further includes a shaft and an end ring, the end ring and the rotor core being sleeved outside the shaft, and the end ring and the shaft being interference-fitted, with the dynamic balance plate disposed on the side of the end ring facing the rotor core.

[0015] In one embodiment, the rotating shaft is provided with cooling oil passages that extend axially along the rotating shaft.

[0016] To achieve the above objectives, this utility model provides an electric motor, which includes a stator core and a rotor assembly disposed on the inner circumferential side of the stator core, wherein the rotor assembly is the rotor assembly described above.

[0017] To achieve the above objectives, this utility model provides a vehicle that includes the motor described above.

[0018] Compared to existing technologies, the present invention proposes a technical solution that, by providing an oil draining component at the end of the rotor core, with the oil draining groove on the component connected to the rotor core, allows the centrifugal force generated during rotor core rotation to drain oil that has seeped into the internal gaps of the rotor core to the outside. Furthermore, multiple oil draining holes of the same radius along the circumference of the rotor core can share a common oil collecting recess, simplifying the structure and reducing the complexity of the manufacturing process. Simultaneously, the improved oil draining efficiency reduces oil residue in the rotor assembly gaps, lowering the frequency and difficulty of motor maintenance, reducing maintenance workload, and improving the reliability and stability of the motor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the rotor assembly of this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the middle oil drain component.

[0022] Explanation of icon numbers:

[0023] 10. Rotor core; 20. Oil drain component; 21. Oil drain groove; 30. Rotary shaft; 31. Cooling oil passage.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in the embodiments of this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the embodiments of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0029] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by the embodiments of this utility model.

[0030] During the operation of an oil-cooled motor, due to the rotation of the rotor, the cooling oil in the shaft and stator may seep into the gap between two adjacent rotor laminations of the rotor assembly through the air gap. It cannot be discharged and gradually accumulates into dead oil, causing poor dynamic balance and affecting the overall NVH performance of the machine.

[0031] In view of this, the present invention provides a rotor assembly, a motor, and a vehicle. By providing an oil draining component at the end of the rotor core, with an oil draining groove on the component connected to the rotor core, when the rotor core rotates, the centrifugal force generated by the rotation can discharge the oil that has seeped into the gaps inside the rotor core to the outside of the rotor core. Moreover, multiple oil draining holes of the same radius along the circumference of the rotor core can share a common oil collecting recess, which simplifies the structure and reduces the complexity of the manufacturing process.

[0032] To better understand the above technical solution, the following detailed explanation is provided in conjunction with the accompanying drawings.

[0033] like Figure 1 and Figure 2 As shown, this utility model embodiment proposes a rotor assembly, which includes:

[0034] The rotor core 10 includes multiple stacked rotor laminations. Each rotor lamination has oil drain holes, which are sequentially connected and used to drain cooling oil that enters adjacent rotor laminations. Multiple oil drain holes are spaced apart along the circumference of the rotor laminations. It is understood that in this embodiment, the rotor core 10 does not have cooling channels; the cooling oil in the rotor core is from accidental seepage of cooling oil from the shaft or stator into adjacent rotor laminations of the rotor core 10.

[0035] An oil draining component 20 is provided at at least one end of the rotor core 10. The end face of the oil draining component 20 facing the rotor core 10 is provided with an oil draining groove 21 that communicates with the oil draining hole. The oil draining groove includes an oil collecting recess, which is sequentially connected to a plurality of oil draining holes arranged circumferentially along the rotor laminations, and is used to discharge the oil from the oil draining holes to the outside of the oil draining component 20.

[0036] In this embodiment, an oil draining component 20 is provided at the end of the rotor core 10. The oil draining groove 21 on the oil draining component 20 is connected to the oil draining hole on the rotor core 10. When the rotor core 10 rotates, the centrifugal force generated by the rotation can discharge the oil that has seeped into the gaps inside the rotor core 10 to the outside of the rotor core 10. Moreover, multiple oil draining holes of the same radius along the circumference of the rotor core 10 can use a common oil collecting recess for oil drainage, which simplifies the structure and reduces the complexity of the production process.

[0037] In one embodiment, the oil collecting recess spirally surrounds the end face of the oil draining component 20 and extends to the outer circumferential surface of the oil draining component 20. The spiral direction of the oil collecting recess from near the inner circumferential surface of the oil draining component 20 to near the outer circumferential surface of the oil draining component 20 is in the same direction as the rotation direction of the rotor core 10. Thus, the spiral-shaped oil collecting recess increases the flow path of the oil, reduces flow resistance, and allows the oil to flow and be discharged better during the oil draining process, thereby improving the oil draining efficiency and reducing oil residue in the rotor assembly gaps. Simultaneously, due to the improved oil draining efficiency, the oil residue in the gaps between adjacent rotor laminations in the rotor core 10 is reduced, lowering the frequency and difficulty of motor maintenance, reducing maintenance workload, and improving the reliability and stability of the motor. Moreover, the spiral-shaped oil collecting recess can be machined on a lathe, effectively reducing the production cost of the oil draining component 20. The spiral-shaped oil collecting recess extends from the inner circumferential surface of the oil draining component 20 towards its outer circumferential surface. The oil collecting recess communicates with the oil drain hole. It is understood that when the oil draining component 20 is assembled at the end of the rotor core 10, the oil collecting recess can cover the oil drain hole on the rotor core 10. Thus, when the rotor core 10 rotates, the oil that has seeped into the rotor core 10 will flow along the oil collecting recess towards the outer circumferential surface of the oil draining component 20 under the action of centrifugal force, and then be discharged from the rotor core 10. Furthermore, for rotor cores 10 with different outer diameters, the position of the oil drain hole is different, that is, the radius of the oil drain hole is different. In this embodiment, the spiral-shaped oil collecting recess has a radial extension length in the rotor core 10, which can meet the communication requirements of oil drain holes with different radii. It is understood that rotor cores 10 with different radii can all use the same oil draining component 20 for oil drainage, improving the versatility of the oil draining component 20.

[0038] Alternatively, the oil drain groove may further include an oil drain recess, which is connected to the oil collecting recess. One end of the oil drain recess extends to the outer circumferential surface of the oil draining component. The curvature of the oil collecting recess is different from that of the oil drain recess. It is understood that, in the direction near the oil drain recess, the oil collecting recess sequentially connects multiple oil drain holes located on the same radius, and under the action of centrifugal force, discharges the collected cooling oil from the oil drain recess to the outside of the oil draining component 20. The oil collecting recess and the oil drain recess have different curvatures, which can optimize the flow path according to the flow characteristics of the cooling oil, reduce flow resistance, prevent the cooling oil from stagnating or turbulent, and improve the oil draining effect. Optionally, the curvature of the oil drain recess is smaller than that of the oil collecting recess, which can reduce flow resistance and facilitate the discharge of cooling oil.

[0039] In one embodiment of this utility model, each of the oil drain holes at least partially overlaps with the oil collecting recess. This ensures that the cooling oil discharged from the oil drain holes can flow into the oil collecting recess, reducing the residue of cooling oil and further improving the oil draining effect.

[0040] In one embodiment of this utility model, the oil draining component 20 is configured as an end ring (not shown in the figure), and the end ring is disposed at the end of the rotor core 10. (Refer to...) Figure 1 In this embodiment, the rotor core 10 can be fixed to the rotor assembly shaft 30 by the end ring. Furthermore, directly providing the oil drain groove 21 on the end ring reduces the number of components used and lowers operating costs. It is understood that the end ring in this embodiment integrates the oil drain groove 21 and can be used as an oil drain component 20.

[0041] In one embodiment of this utility model, the oil drain component 20 is configured as a dynamic balancing plate (not shown in the figure), which is located at the end of the rotor core 10. A dynamic balancing plate is typically installed at the end of the rotor core 10. This dynamic balancing plate allows for adjustment of the rotor's mass distribution, ensuring the rotor's center of mass coincides with the shaft 30, thereby reducing rotor imbalance. It also reduces vibration during rotor rotation, improving stability and reliability. Therefore, directly installing the oil drain groove 21 on the dynamic balancing plate as the oil drain component 20 reduces the number of components used and lowers operating costs.

[0042] In one embodiment of this utility model, the dynamic balancing plate is provided with weight reduction holes, and the oil drain groove 21 is offset from the weight reduction holes. In this way, the oil in the oil drain groove 21 can be prevented from flowing into the weight reduction holes, thereby preventing the oil from seeping back into the rotor core 10 and further improving the oil draining effect.

[0043] In one embodiment of this utility model, reference is made to Figure 1The rotor assembly also includes a shaft 30 and an end ring. The end ring and the rotor core 10 are sleeved on the outside of the shaft 30, and the end ring and the shaft 30 are interference-fitted. The end ring is located on the side of the dynamic balance plate away from the rotor core 10. In this embodiment, refer to... Figure 1 The rotor core 10 can be fixed to the rotor assembly shaft 30 by means of the end ring. In this way, the rotor core 10 can be fixed to the shaft 30 by the interference fit between the end ring and the shaft 30, preventing the rotor core 10 from moving axially along the shaft 30.

[0044] In one embodiment of this utility model, reference is made to Figure 1 The rotating shaft 30 is provided with a cooling oil passage 31, which extends along the axial direction of the rotating shaft 30. The cooling oil passage 31 allows cooling oil to flow, and during the flow, the cooling oil can carry away the heat from the surface of the rotating shaft 30, thereby cooling the rotating shaft 30.

[0045] To achieve the above objectives, this utility model provides an electric motor, which includes a stator core and a rotor assembly disposed on the inner circumference of the stator core. The rotor assembly is the rotor assembly described above. Specifically, the specific structure of the rotor assembly refers to the above embodiments. Since this motor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0046] To achieve the above objectives, this utility model provides a vehicle that includes the motor described above. Specifically, the specific structure of the motor is as described in the above embodiments. Since this vehicle adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0047] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model embodiments. Any equivalent structural transformations made under the technical concept of the present utility model using the description and drawings of the present utility model embodiments, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model embodiments.

Claims

1. A rotor assembly, characterized in that, The rotor assembly includes: A rotor core comprising a plurality of stacked rotor laminations, each lamination having an oil drain hole. The oil drain holes on the plurality of rotor laminations are sequentially connected and used to drain cooling oil entering adjacent rotor laminations. The oil drain holes are spaced apart circumferentially along the rotor laminations. An oil draining component is provided at at least one end of the rotor core. The end face of the oil draining component facing the rotor core is provided with an oil draining groove communicating with the oil draining hole. The oil draining groove includes an oil collecting recess. The oil collecting recess is sequentially connected to a plurality of oil draining holes arranged circumferentially along the rotor laminations and is used to discharge the oil from the oil draining holes to the outside of the oil draining component.

2. The rotor assembly as claimed in claim 1, characterized in that, The oil collecting recess is spirally wrapped around the end face of the oil discharge member and extends to the outer peripheral surface of the oil discharge member. The spiral direction of the oil collecting recess from the inner peripheral surface of the oil discharge member to the outer peripheral surface of the oil discharge member is the same as the rotation direction of the rotor core. Alternatively, the oil drain groove may further include an oil drain recess, which is connected to the oil collection recess. One end of the oil drain recess extends to the outer peripheral surface of the oil draining component, and the curvature of the oil collection recess is different from that of the oil drain recess.

3. The rotor assembly as claimed in claim 1, characterized in that, Each of the oil drain holes at least partially overlaps with the oil collection recess.

4. The rotor assembly as claimed in claim 1, characterized in that, The oil draining component is configured as an end ring, which is located at the end of the rotor core.

5. The rotor assembly as claimed in claim 1, characterized in that, The oil draining component is configured as a dynamic balancing plate, which is located at the end of the rotor core.

6. The rotor assembly as claimed in claim 5, characterized in that, The dynamic balancing plate is provided with weight reduction holes, and the oil drain groove is offset from the weight reduction holes.

7. The rotor assembly as claimed in claim 5, characterized in that, The rotor assembly also includes a shaft and an end ring. The end ring and the rotor core are sleeved outside the shaft, and the end ring and the shaft are interference-fitted. The dynamic balance plate is located on the side of the end ring facing the rotor core.

8. The rotor assembly as claimed in claim 7, characterized in that, The rotating shaft is provided with cooling oil passages that extend along the axial direction of the rotating shaft.

9. An electric motor, characterized in that, The motor includes a stator core and a rotor assembly disposed on the inner circumferential side of the stator core, wherein the rotor assembly is the rotor assembly as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, The vehicle includes the motor as described in claim 9.

Images