Motor oil cooling system, motor, electric drive assembly system and vehicle
By adopting a layout similar to a water-cooling system in the automotive motor oil cooling system and using two shells to form a cooling channel, the existing oil cooling system is solved, and a simpler and smaller structure is achieved, providing good cooling effect and higher reliability.
Patent Information
- Application Number
- CN202311792441.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2025-06-24
AI Technical Summary
The existing automotive motor oil-cooling system requires additional pipes to transmit cooling oil, resulting in large size, complex structure, high cost, and inability to share components with the water-cooling system, increasing development costs.
Using a layout similar to a water cooling system, a cooling channel is formed through two shells, and a cooling inlet is directly set on the outer shell. The cooling oil flows between the shells, and the cooling oil is injected into the components of the motor through the nozzle, simplifying the structure and reducing volume and cost.
It reduces development costs, reduces system volume, provides good cooling effect, improves system reliability, and reduces costs.
Smart Images
Figure CN120200420A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a motor oil cooling system, a motor, an electric drive assembly system, and a vehicle. Background Art
[0002] Existing vehicles generally use a water cooling system or an oil cooling system to cool the electric drive system of the vehicle, more precisely, to cool the motor in the electric drive system. The oil cooling system generally uses the oil for lubrication to achieve the cooling of the motor. Known oil cooling systems require additional pipes for transporting the cooling oil, so additional space is needed to arrange these pipes, which results in a larger volume of the system, a complex structure, and a higher cost. In addition, the design of the additional pipes makes the design and assembly of other components of the motor, especially the stator, more complex. Further, the structure of the oil cooling system is completely different from that of the water cooling system and cannot be realized by using the components of the water cooling system, so additional development costs are required.
[0003] Specifically, in a known oil cooling system, the oil injection part includes a plurality of injection pipelines arranged in the reducer housing. These pipelines are arranged near the outside of the stator and can directly inject cooling oil onto the stator of the motor. However, this design makes the size of the motor larger and requires more components, so the cost is higher. In addition, the design and assembly of the pipelines for injecting cooling oil required by this design are both more complex.
[0004] Therefore, there is a need in the art for a motor oil cooling system that can solve the above problems. Summary of the Invention
[0005] Therefore, an object of the present disclosure is to provide a motor oil cooling system, a motor, an electric drive assembly system, and a vehicle. The layout of the motor oil cooling system is similar to that of the water cooling system, and the transmission path of the cooling oil is formed by the housing, so the development cost is reduced, the volume of the system is reduced, a good cooling effect is provided, the reliability of the system is improved, and the cost is reduced.
[0006] The above object is achieved by the motor oil cooling system, the motor, the electric drive assembly system, and the vehicle described below.
[0007] The present disclosure provides a motor oil cooling system, which includes: a first housing having a cylindrical first wall and provided with a cooling inlet thereon; a second housing having a cylindrical second wall, at least a part of the second wall is disposed inside the first wall and spaced apart from the first wall; a cooling channel formed between the first wall and the second wall and in fluid communication with the cooling inlet; and a nozzle disposed on the second wall and in fluid communication with the cooling channel for injecting cooling oil onto the components of the motor.
[0008] The motor oil cooling system of the present disclosure uses two housings to form a cooling channel, and the layout is similar to that of a water cooling system. Therefore, the oil cooling system of the present disclosure can be developed based on the water cooling system, reducing the cost of re-development. The cooling inlet is directly formed on the outer housing, making the structure simpler and the volume smaller. The cooling oil can flow between the first housing and the second housing to dissipate the heat generated during the operation of the motor. This design does not require additional pipelines, especially the oil ring that is separately designed from the housing and used to spray cooling oil onto the stator winding. Therefore, the structure is simple, the volume is small, and there is no problem of unreliability of the additional pipelines. Through the above cooling channel, not only can the stator be directly cooled, but also the cooling oil can be guided from the cooling inlet to other required cooling positions. In addition, due to the simple structure of the above cooling channel, no other components such as oil rings are provided on the stator, which reduces the cost and the volume of the motor. By providing nozzles, not only can the motor be cooled from the outside, but also the components inside the motor can be directly cooled.
[0009] In one embodiment, spiral ribs are provided on the outer surface of the second wall.
[0010] In one embodiment, the free end of the spiral rib abuts against the inner surface of the first wall to define a spiral-shaped flow channel. In this way, better control of the flow of the cooling oil can be achieved.
[0011] In one embodiment, there is a gap between the free end of the spiral rib and the inner surface of the first wall. In this way, free flow of the cooling oil can be allowed.
[0012] In one embodiment, the cooling inlet is located at the center of the first wall. In one embodiment, the cooling channels are symmetrically arranged with respect to the cooling inlet. In this way, a uniform distribution of the cooling oil on both the left and right sides of the motor can be achieved, thus ensuring a relatively uniform cooling effect, especially achieving a uniform temperature distribution of the stator.
[0013] In one embodiment, the cooling channel extends from the cooling inlet to both ends of the second wall.
[0014] In one embodiment, the nozzles are provided at both ends of the second wall and correspond to the windings of the motor. In this way, direct cooling of the windings inside the motor is achieved, thereby further improving the cooling efficiency.
[0015] In one embodiment, the first housing and the second housing are assembled together by interference fit. In this way, good sealing between the first housing and the second housing can be ensured.
[0016] In one embodiment, the motor oil cooling system further includes a seal disposed between the first wall and the second wall. Thus, better sealing between the first housing and the second housing can be achieved.
[0017] In one embodiment, circumferential ribs protruding from the outer surface of the second wall are provided at both ends of the second wall. The circumferential ribs are located outside the corresponding nozzles and mounting grooves for the seal are provided thereon. Through the cooperation of the structure and the seal, a better sealing effect can be achieved.
[0018] In one embodiment, the motor oil cooling system further includes a pump that pumps the cooling oil to the cooling inlet.
[0019] The present disclosure also provides a motor, which includes the motor oil cooling system as described above.
[0020] The present disclosure also provides an electric drive assembly system, which includes the motor as described above.
[0021] The present disclosure also provides a vehicle, which includes the motor as described above, or includes the electric drive assembly system as described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Advantages and objectives of the present disclosure can be better understood from the preferred embodiments of the present disclosure described in detail below with reference to the accompanying drawings. For better showing the relationship between components in the drawings, the drawings are not drawn to scale. In the drawings:
[0023] Figure 1 A schematic diagram of a motor for a vehicle according to an embodiment of the present disclosure is shown;
[0024] Figure 2 A schematic diagram of a housing of a motor oil cooling system according to an embodiment of the present disclosure is shown; and
[0025] Figure 3 Shown according to Figure 2 A schematic diagram of a part of the housing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] In order to make the objectives, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments of the present disclosure. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.
[0027] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second", and similar terms used in the specification and claims of this patent application of the disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily denote a quantity limitation. Terms such as "comprising", "including", or "having" mean that the elements or items appearing before the term encompass the elements or items listed after the term and their equivalents, without excluding other elements or items. Terms such as "connected" or "communicated" are not limited to the physical or mechanical connections or communications shown in the drawings, but may include equivalent connections or communications thereto, whether direct or indirect. Terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0028] Next, refer to Figures 1 to 3 and describe each embodiment of the disclosure in detail.
[0029] As Figure 1 shown, the motor according to the disclosure may include a rotor 14, a stator 15, and a motor oil cooling system specifically described below, and the motor oil cooling system is used to cool the motor. The rotor 14 and the stator 15 are both sealed in the housing of the motor, and the rotor 14 is located inside the stator 15. The rotor 14 includes a rotatable shaft and a rotor core provided on the shaft and composed of a plurality of metal laminations (e.g., silicon steel sheets). The stator 15 includes a stator core composed of a plurality of metal laminations (e.g., silicon steel sheets) and windings 8 provided thereon. The stator core has a generally cylindrical structure, and the rotor 14 is accommodated therein. Exemplarily, after three-phase alternating current is applied to the windings 8, a rotating magnetic field can be generated, and then an electromagnetic torque is generated to drive the rotor to rotate. The windings 8 can be embedded in the slots of the stator according to a certain rule and form a bun shape at the end of the stator. In addition, the motor of the disclosure may further include a pump not shown herein, which is used to pump, for example, the cooling oil from the reducer to the motor oil cooling system. The motor may be disposed in a vehicle or an electric drive assembly system of a vehicle. The vehicle may be an electrified vehicle, such as a pure electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, an extended-range electric vehicle, or a hydrogen energy vehicle.
[0030] As Figure 1 shown, the motor oil cooling system may include a first housing 1, a second housing 2, a cooling channel 6, and a nozzle 7 (see Figure 2 and 3)。The cooling channel 6 is formed between the first housing 1 and the second housing 2. The rotor 14 and the stator 15 described above can be disposed in the cavities of the first housing 1 and the second housing 2, specifically, in the cavity formed by the second housing 2, as described below. Similar to the layout of the water-cooling system of an electric motor, the oil-cooling system of the present disclosure uses two housings to form a cooling channel, and the cooling channel is isolated from the rotor and the stator by the housings, and the cooling medium does not contact the stator or the rotor most of the time. Therefore, those skilled in the art can develop the oil-cooling system of the present disclosure based on the water-cooling system, reducing the cost of re-development.
[0031] The first housing 1 has a cylindrical first wall 4 and a cooling inlet 3 is provided thereon. The pump described above can pump the cooling oil to the cooling inlet 3. The cooling inlet is directly formed on the outer housing, making the structure simpler and the volume smaller.
[0032] The second housing 2 has a cylindrical second wall 5, and the second wall 5 is at least partially disposed inside the first wall 4 and spaced apart from the first wall 4. The rotor 14 and the stator 15 described above are disposed in the cavity formed by the second housing 2. The cooling oil described above can thus flow between the first housing and the second housing to dissipate the heat generated during the operation of the electric motor. This design does not require additional pipelines, especially an oil ring that is designed to be separated from the housing for spraying cooling oil onto the stator winding. Therefore, the structure is simple, the volume is small, and there is no problem of unreliability of the additional pipelines.
[0033] For example, the above-mentioned first housing 1 and the second housing 2 can be assembled together by interference fit. In this way, a good seal between the first housing 1 and the second housing 2 can be ensured. In addition, the oil-cooling system of the electric motor can also include a seal 10 disposed between the first wall 4 of the first housing 1 and the second wall 5 of the second housing 2, such as an O-ring or the like. An installation groove 12 for the seal 10 is provided on the outer surface of the second wall 5 of the second housing 2. Thus, a better seal between the first housing 1 and the second housing 2 can be achieved. For example, as Figure 1 shown, circumferential ribs 11 protruding from the outer surface of the second wall 5 are provided at both ends of the second wall 5. The circumferential ribs 11 are located outside the corresponding nozzles 7 and an installation groove 12 for the seal 10 is provided thereon. The "outside" described herein means that the circumferential ribs 11 are closer to the ends relative to the adjacent nozzles 7. Compared with the conventional housing, the length of the second housing 2 of the present disclosure is extended, so that in addition to the nozzles 7, there is still space for forming the circumferential ribs 11 described above. Through this structural adaptation, a better sealing effect can be achieved.
[0034] A cooling channel 6 is formed between the first wall 4 and the second wall 5 and is in fluid communication with the cooling inlet 3. Adjacent to the inner side of the second housing 2 is the stator 15 of the motor, more specifically the stator core. Thus, through the above-mentioned cooling channel, not only can the stator core be directly cooled, but also the cooling oil can be guided from the cooling inlet to other required cooling positions. In addition, due to the simple structure of the cooling channel of the present disclosure, no other components such as oil rings are provided on the stator, which reduces the cost and decreases the volume of the motor.
[0035] As Figure 2 and 3 shown, a nozzle 7 is provided on the second wall 5 of the second housing 2 and is in fluid communication with the cooling channel 6 for spraying the cooling oil onto the components of the motor. By providing the nozzle, the cooling oil can be sprayed onto the components inside the motor, so that not only can the motor be cooled from the outside, but also the components inside the motor can be directly cooled, thus improving the cooling effect and ensuring the reliability of the motor.
[0036] Referring again to Figures 1 to 3 , a spiral rib 9 is provided on the outer surface of the inner second wall 5, which protrudes from the surface of the second wall 5 and forms a spiral-shaped flow path for the cooling oil. For example, the free end of the spiral rib 9 can abut against the inner surface of the first wall 4 to define a spiral-shaped flow path. The free end is the end of the spiral rib 9 that is away from the second housing 2. In this way, better control of the flow of the cooling oil can be achieved. Of course, the free end of the spiral rib 9 may not abut against the inner surface of the first wall 4, that is, a gap 13 is left between the free end of the spiral rib 9 and the inner surface of the first wall 4, as Figure 1 shown, to allow the free flow of the cooling oil. Specifically, the cooling oil can flow from the cooling inlet 3 to the nozzle 7 unobstructed.
[0037] As Figure 1 shown, the cooling inlet 3 can be located approximately at the center of the first wall 4 of the first housing 1. As Figures 1 to 3 shown, the cooling channel 6 can be symmetrically arranged with respect to the cooling inlet 3. Through this central and symmetrical arrangement, a uniform distribution of the cooling oil on both sides of the motor can be achieved, thus ensuring a relatively uniform cooling effect, especially achieving a uniform temperature distribution of the stator. Of course, the cooling inlet 3 may not be located at the center of the first wall 4, and a slight deviation is allowed.
[0038] For example, as Figure 3 shown, the cooling channel 6 extends from the cooling inlet 3 to both ends of the second wall 5 of the second housing 2. For example, the nozzles 7 are provided at both ends of the second wall 5 and correspond to the windings 8 of the stator 15, as Figure 1 shown. Referring to Figure 1, the nozzle 7 can correspond to the bun-shaped part of the winding 8 at the end of the stator. In this way, the cooling oil can be directly sprayed onto the winding 8 by the nozzle 7, realizing the direct cooling of the internal winding of the motor, thereby further improving the cooling efficiency.
[0039] For example, the nozzles 7 can be evenly distributed on the second wall 5 in the circumferential direction of the second housing 2. Of course, it is also possible that more nozzles 7 can be distributed on the upper part of the second housing 2, because the cooling oil sprayed onto the upper winding will flow to the lower winding under the action of gravity.
[0040] As Figure 2 shown by the arrow in, after the cooling oil flows into the space between the first housing 1 and the second housing 2 from the cooling inlet 3, it will generally flow along the direction shown by the arrow until both ends of the second housing 2, where it is sprayed onto the winding 8 of the motor by the nozzle 7. Finally, through the collecting device at the bottom of the motor or at the bottom of the first housing or the second housing, the cooling oil is recycled to the cooling device of the electric drive system.
[0041] As described above, the layout of the motor oil cooling system of the present disclosure can reduce the development cost, reduce the volume of the system, provide good cooling effect, improve the reliability of the system, and reduce the cost. It should be understood that the motor of the present disclosure, the electric drive assembly system of the present disclosure, and the vehicle of the present disclosure also have the advantages described above regarding the motor oil cooling system.
[0042] In addition, the above-disclosed technical features are not limited to the combinations with other disclosed features. Those skilled in the art can also make other combinations between the technical features according to the purpose of the invention, subject to achieving the purpose of the present disclosure.
Claims
1. An engine oil cooling system, characterized in that, The motor oil cooling system includes: A first housing (1) having a cylindrical first wall (4) with a cooling inlet (3) provided thereon; A second housing (2) having a cylindrical second wall (5), at least a part of the second wall being disposed inside the first wall and spaced apart from the first wall; A cooling channel (6) formed between the first wall (4) and the second wall (5) and in fluid communication with the cooling inlet (3); and Nozzles (7) provided on the second wall (5) and in fluid communication with the cooling channel (6) for spraying cooling oil onto components of the motor.
2. The motor oil cooling system according to claim 1, wherein A spiral rib (9) is provided on an outer surface of the second wall (5).
3. The motor oil cooling system according to claim 2, characterized in that, A free end of the spiral rib (9) abuts an inner surface of the first wall (4) to define a spiral-shaped flow path.
4. The motor oil cooling system according to claim 2, characterized in that, A gap (13) exists between the free end of the spiral rib (9) and the inner surface of the first wall (4).
5. The motor oil cooling system according to claim 1, characterized in that, The cooling inlet (3) is located at the center of the first wall (4).
6. The motor oil cooling system according to claim 5, characterized in that, The cooling channel (6) is symmetrically arranged with respect to the cooling inlet (3).
7. The motor oil cooling system according to any one of claims 1 to 6, characterized in that, The cooling channel (6) extends from the cooling inlet (3) to both ends of the second wall (5).
8. The motor oil cooling system according to claim 7, wherein, The nozzles (7) are provided at both ends of the second wall (5) and correspond to windings (8) of the motor.
9. The motor oil cooling system according to claim 8, characterized in that, The first housing (1) and the second housing (2) are assembled together by interference fit.
10. The motor oil cooling system according to claim 8, wherein, The motor oil cooling system further includes a seal (10) provided between the first wall (4) and the second wall (5).
11. The motor oil cooling system according to claim 10, wherein Circumferential ribs (11) protruding from an outer surface of the second wall (5) are provided at both ends of the second wall (5), the circumferential ribs (11) being located outside corresponding nozzles (7) and having mounting grooves (12) for the seal provided thereon.
12. The motor oil cooling system according to any one of claims 1 to 6, characterized in that, The motor oil cooling system further includes a pump that pumps the cooling oil to the cooling inlet (3).
13. A motor, characterized in that, The motor includes the motor oil cooling system according to any one of claims 1 to 12.
14. An electric drive assembly system, characterized in that, The electric drive assembly system includes the motor according to claim 13.
15. A vehicle, characterized in that, The vehicle includes the motor according to claim 13, or includes the electric drive assembly system according to claim 14.