Transmission case shell integrated with cooling oil way, transmission case and vehicle

Abstract

The utility model relates to a transmission case shell integrated with a cooling oil way, a transmission case and a vehicle, the transmission case shell and the cooling oil way form an integrated structure through casting, and the transmission case shell comprises a front shell, a middle shell and a rear shell which are connected in sequence; the cooling oil way comprises a first oil way used for oil feeding of the cooling oil way and integrated on the middle shell. The second oil duct is integrated on the rear shell; the third oil duct is integrated on the front shell; and the first oil duct is simultaneously connected with the second oil duct and the third oil duct. By the adoption of the scheme, the cooling oil way and the transmission case shell are integrated together, the integrated structure enables the internal layout of the transmission case shell to be more compact, connecting structures between oil way structures in a conventional transmission case shell are reduced, a conventional oil way fixing structure is also reduced, and the weight and the size of the transmission case are reduced; corresponding oil ducts are integrated in the front shell, the middle shell and the rear shell, the interior of the transmission case shell is cooled evenly, and the situation that the local temperature in the transmission case shell is too high is avoided.

Description

Technical Field

[0001] This utility model relates to the field of transmission box technology, and in particular to a transmission box housing, transmission box and vehicle with integrated cooling oil circuit. Background Technology

[0002] With the global automotive industry placing increasing emphasis on energy conservation and environmental protection, and the rapid development of new energy vehicle technologies, hybrid vehicles, due to their combination of fuel economy and emission reduction benefits, have gradually become an important development direction for the automotive industry. Among them, Dedicated Hybrid Transmission (DHT) technology, as an advanced hybrid solution, achieves efficient collaborative operation between the engine and electric motor through a highly integrated power distribution system. However, due to its complex operating environment and high-intensity load characteristics, the DHT transmission generates a large amount of heat during the circulation of its internal lubricating oil. Effective cooling of the lubrication system is crucial for ensuring transmission efficiency, extending component life, and maintaining system stability.

[0003] The cooling and lubrication circuit systems currently used in Dated Hybrid Transmission (DHT) gearboxes have the following problems in practical applications: limited integration. Specifically, the existing cooling and lubrication systems are independent of the main structure of the DHT gearbox, resulting in an uncompact overall layout, increased volume and weight, and thus high structural complexity. Utility Model Content

[0004] Based on this, an XXX device is provided to improve the problem that the structural layout of the transmission box in the prior art is not compact enough, resulting in excessive weight and volume of the transmission box.

[0005] On the one hand, this utility model provides a transmission housing with integrated cooling oil circuit, a transmission housing and a vehicle. The transmission housing and the cooling oil circuit are formed into an integral structure by casting. The transmission housing includes a front housing, a middle housing and a rear housing connected in sequence.

[0006] The cooling oil circuit includes:

[0007] The first oil passage, used for the inlet of the cooling oil circuit, is integrated into the middle shell;

[0008] The second oil passage is integrated into the rear housing;

[0009] The third oil passage is integrated into the front housing.

[0010] The first oil passage is connected to both the second and third oil passages.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] In one implementation, the first oil passage includes:

[0013] The first oil passage body is a cylindrical cavity. One end of the first oil passage body is connected to the oil inlet of the cooling oil passage, and the first oil passage body is connected to multiple branches along the axial direction.

[0014] In one implementation, the first oil passage also includes:

[0015] The first central branch is used to connect the main body of the first oil passage and the second oil passage;

[0016] The second central branch is used to connect the main body of the first oil passage and the third oil passage;

[0017] The first and second central branch roads are staggered along the axial direction of the main body of the first oil passage and extend in opposite radial directions.

[0018] In one implementation, the second oil passage includes:

[0019] The main body of the second oil passage is long and narrow;

[0020] The first oil leak has multiple outlets, which are spaced apart along the length of the second oil passage body.

[0021] In one implementation, the third oil passage includes:

[0022] The main body of the third oil passage is long and narrow;

[0023] The first branch line is connected to one end of the main body of the third oil passage, and the first branch line is also connected to the generator oil distribution plate.

[0024] The second branch is connected to the other end of the third oil passage body, and the end of the second branch is connected to the oil distribution plate of the drive motor.

[0025] The first spray pipe is used for spraying oil and is connected to the middle of the second branch.

[0026] In one implementation, the first oil passage also includes:

[0027] The first end branch and the second end branch are both located at one end of the first oil passage, and the other end of the first oil passage is used for oil inlet;

[0028] The cooling oil circuit also includes:

[0029] Two axially parallel oil guide ring assemblies are used to surround and cool the dual-motor assembly. The first oil passage is located between the two oil guide ring assemblies, and the two oil guide ring assemblies are respectively connected to the first end branch and the second end branch.

[0030] In one implementation, each oil guide ring assembly includes:

[0031] The lead oil ring has an annular cavity.

[0032] The rear guide ring is coaxial with the front guide ring and spaced apart.

[0033] The housing stator oil passage is used to connect the front guide oil ring and the rear guide oil ring;

[0034] The fuel injector is used for fuel injection. Both the front and rear fuel guide rings have multiple fuel injectors facing the center.

[0035] In one implementation, each oil guide ring assembly has multiple housing stator oil passages arranged in a ring. The front oil guide ring, multiple housing stator oil passages, and the rear oil guide ring are connected in sequence to form a coaxial ring structure.

[0036] Secondly, this utility model also provides a transmission box, including a transmission box housing with integrated cooling oil circuits, and a dual motor assembly surrounded by cooling oil circuits.

[0037] Thirdly, this utility model also provides a vehicle, including a transmission housing with integrated cooling oil circuit.

[0038] The beneficial effects of this utility model are as follows: By integrating the cooling oil circuit with the transmission housing, the integrated structure makes the internal layout of the transmission housing more compact, reduces the connection structure between the oil circuit structures in the conventional transmission housing, and also reduces the conventional oil circuit fixing structure, which helps to reduce the weight and volume of the transmission housing; in addition, the transmission housing is divided into three parts: front housing, middle housing and rear housing, which facilitates the casting and molding of the transmission housing; corresponding oil channels are integrated in the front housing, middle housing and rear housing to ensure uniform cooling of the inside of the transmission housing and avoid local overheating. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural schematic diagram of the cooling oil circuit in one embodiment;

[0040] Figure 2 for Figure 1 A structural diagram from another three-dimensional perspective;

[0041] Figure 3 for Figure 1 A schematic diagram of the structure from a planar perspective;

[0042] Figure 4 for Figure 1 A schematic diagram of the structure from another planar perspective.

[0043] In the attached diagram, the components represented by each number are as follows:

[0044] 10. First oil passage; 11. Main body of the first oil passage; 12. First central branch; 13. Second central branch; 14. First end branch; 15. Second end branch;

[0045] 20. Second oil passage; 21. Main body of the second oil passage; 22. First oil leak;

[0046] 30. Third oil passage; 31. Main body of the third oil passage; 32. First branch; 33. Second branch; 34. First spray pipe; 35. Second spray pipe;

[0047] 40. Oil guide ring assembly; 41. Front oil guide ring; 42. Rear oil guide ring; 43. Housing stator oil passage; 44. Oil injection port;

[0048] 50. Oil inlet; 60. Generator oil distribution plate; 70. Drive motor oil distribution plate. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] Example 1:

[0051] A transmission housing with integrated cooling oil circuit, see [reference] Figure 1-2 The transmission housing and cooling oil circuit are formed into an integral structure by casting. The transmission housing includes a front housing, a middle housing and a rear housing connected in sequence.

[0052] The cooling oil circuit includes:

[0053] The first oil passage 10 is used for the oil inlet of the cooling oil circuit and is integrated on the middle shell;

[0054] The second oil passage 20 is integrated into the rear housing;

[0055] The third oil passage 30 is integrated into the front housing.

[0056] The first oil passage 10 is connected to both the second oil passage 20 and the third oil passage 30.

[0057] The beneficial effects of this embodiment are as follows: by integrating the cooling oil circuit with the transmission housing, the integrated structure makes the internal layout of the transmission housing more compact, reduces the connection structure between the oil circuit structures in the conventional transmission housing, and also reduces the conventional oil circuit fixing structure, which helps to reduce the weight and volume of the transmission housing; in addition, dividing the transmission housing into three parts—front housing, middle housing, and rear housing—facilitates the casting and molding of the transmission housing; corresponding oil passages are integrated in the front housing, middle housing, and rear housing, ensuring uniform cooling of the transmission housing and avoiding localized overheating.

[0058] In some implementations, see Figure 1 and Figure 3 The first oil passage 10 includes:

[0059] The first oil passage body 11 is a cylindrical cavity. One end of the first oil passage body 11 is connected to the oil inlet 50 of the cooling oil passage. The first oil passage body 11 is connected to multiple branches along the axial direction. In this way, one end of the first oil passage 10 is used to connect to the oil inlet 50, which facilitates the introduction of cooling oil into the cooling oil passage. By connecting multiple branches along the axial direction of the first oil passage body 11, it is convenient to introduce cooling oil into each branch and cool the entire transmission housing.

[0060] In some implementations, see Figure 1-2 The first oil passage 10 also includes:

[0061] The first central branch 12 is used to connect the first oil passage body 11 and the second oil passage 20;

[0062] The second central branch 13 is used to connect the first oil passage main body 11 and the third oil passage 30;

[0063] The first central branch 12 and the second central branch 13 are offset from each other along the axial direction of the first oil passage body 11 and extend in opposite radial directions. Thus, the first oil passage 10 includes the first central branch 12 and the second central branch 13, wherein the first central branch 12 connects the first oil passage 10 to the second oil passage 20, and the second central branch 13 connects the first oil passage 10 to the second oil passage 20, thereby introducing cooling oil from the first oil passage 10 into the second oil passage 20 and the third oil passage 30 respectively.

[0064] In some implementations, see Figure 2 The second oil channel 20 includes:

[0065] The main body of the second oil passage 21 is long and narrow;

[0066] The first oil drain port 22 is provided in multiple locations and is spaced apart along the length of the second oil passage body 21. In this way, by making the second oil passage body 21 into a long strip shape, the cooling length of the second oil passage body 21 is increased, which also facilitates the extension of the second oil passage body 21 and the opening of multiple first oil drain ports 22. By providing multiple first oil drain ports 22, oil can be discharged from multiple locations along the length of the second oil passage body 21, which is convenient for oil cooling of corresponding workpieces in the transmission box. In addition, integrating and machining the first oil drain ports 22 on the rear housing reduces the number of parts, reduces the assembly difficulty, and improves the integration of the entire design.

[0067] In the embodiments, see Figure 2 The first oil leak 22 is essentially an opening, but visually it presents a raised structure, which can be understood as an indication of the direction of oil leakage.

[0068] Specifically, the first oil drain port 22 on the second oil passage 20 is directly connected to the inside of the generator rotor shaft, providing cooling and lubrication for the generator rotor shaft. An oil-throwing hole system is also arranged inside the generator rotor shaft. This system uses centrifugal force to throw a portion of the lubricating oil onto the inner surface of the generator stator as the lubricating oil passes through the rotor shaft, effectively cooling the stator and preventing performance degradation or equipment damage due to overheating.

[0069] In some implementations, see Figure 1-2 The third oil channel 30 includes:

[0070] The main body of the third oil passage 31 is long and narrow;

[0071] The first branch 32 is connected to one end of the third oil passage main body 31. The first branch 32 is also connected to the generator oil distribution plate 60.

[0072] The second branch 33 is connected to the other end of the third oil passage body 31, and the end of the second branch 33 is connected to the drive motor oil distribution plate 70.

[0073] The first spray pipe 34 is used for oil spraying and is connected to the middle of the second branch 33. Thus, the third oil passage 30 includes the third oil passage body 31, the first branch 32, the second branch 33 and the first spray pipe 34, wherein the first branch 32 is connected to the generator oil distribution plate 60, the second branch 33 is connected to the motor oil distribution plate, and the first spray pipe 34 directly sprays oil for cooling.

[0074] Specifically, both the generator oil distribution plate 60 and the drive motor oil distribution plate 70 are equipped with a second oil drain port. The generator oil distribution plate 60 is tightly connected to the generator gear shaft, and the drive motor oil distribution plate 70 is tightly connected to the drive motor gear shaft. This design allows the gear oil flowing from the third oil passage body 31 to precisely pass through the pre-set oil passage system inside the generator gear shaft and the oil outlet hole between them, directly reaching the key connection parts between the two shafts. This achieves comprehensive and effective cooling and lubrication of the spline connection area, thereby significantly improving the working performance and service life of the spline connection parts and ensuring the efficient and safe operation of the entire power transmission system. In addition, the oil distribution plate on the front housing can also provide sufficient cooling and lubrication for the front bearing positions of the generator gear shaft and the drive motor gear shaft. The drive motor gear shaft oil distribution plate position is also equipped with an oil passage connecting to the intermediate shaft assembly, ensuring the cooling and lubrication of the intermediate shaft and bearings.

[0075] Specifically, the third oil passage body 31 is also connected to a second spray pipe 35, both of which extend towards the guide oil ring assembly 40. The third oil passage 30 has spray pipes above the generator gear shaft and drive motor gear shaft, enabling high-level spraying of the transmission gear shaft system. Especially for gear components that are difficult to effectively cool and lubricate using conventional splash lubrication methods due to their position, it can directly and precisely spray gear oil onto the area above these gears, ensuring comprehensive and sufficient lubrication and cooling of the entire gear shaft system, greatly improving the safety and stability of equipment operation. The generator rotor shaft and its corresponding generator gear shaft, as well as the drive motor rotor shaft and its corresponding drive motor gear shaft, all employ precision spline connections to ensure high transmission accuracy and stability. To ensure sufficient cooling and lubrication of the spline connection, the front housing is equipped with a generator oil distribution plate 60 and a drive motor oil distribution plate 70 connected to the third oil passage 30. The gear oil flowing from the third oil passage 30 can precisely pass through the pre-set oil passage system inside the generator gear shaft and drive motor gear shaft, as well as the oil outlet holes between them, directly reaching the key connection parts between the two shafts. This achieves comprehensive and effective cooling and lubrication of the spline connection area, thereby significantly improving the working performance and service life of the spline connection parts and ensuring the efficient and safe operation of the entire power transmission system. At the same time, the oil distribution plate on the front housing can also provide sufficient cooling and lubrication for the front bearing positions of the generator gear shaft and drive motor gear shaft. The drive motor gear shaft oil distribution plate position is also equipped with an oil passage connecting to the intermediate shaft assembly to ensure the cooling and lubrication of the intermediate shaft and bearings.

[0076] In some implementations, see Figure 1 and Figure 4 The first oil passage 10 also includes:

[0077] The first end branch 14 and the second end branch 15 are both located at one end of the first oil passage 10, and the other end of the first oil passage 10 is used for oil inlet.

[0078] The cooling oil circuit also includes:

[0079] Two axially parallel oil guide ring assemblies 40 are used to surround and cool the dual-motor assembly. A first oil passage 10 is located between the two oil guide ring assemblies 40. The two oil guide ring assemblies 40 are respectively connected to a first end branch 14 and a second end branch 15. In this way, the first oil passage 10 is connected to one oil guide ring assembly 40 through the first end branch 14, and the first oil passage 10 is connected to the other oil guide ring assembly 40 through the second end branch 15. Since the oil guide ring assemblies 40 are used to surround and cool the dual-motor assembly, the circumferential surround and cooling effect of the dual-motor assembly is ensured.

[0080] Specifically, the oil guide ring assembly 40 mainly consists of an oil guide ring and a sealing ring structure, and is installed at both ends of the motor stator core.

[0081] In some implementations, see Figure 2 Each oil guide ring assembly 40 includes:

[0082] The lead oil ring 41 has an annular cavity.

[0083] The rear guide oil ring 42 is coaxial with the front guide oil ring 41 and is spaced apart from it.

[0084] The housing stator oil passage 43 is used to connect the front guide oil ring 41 and the rear guide oil ring 42;

[0085] The oil injection port 44 is used for oil injection. Both the front guide oil ring 41 and the rear guide oil ring 42 have multiple oil injection ports 44 facing the center. In this way, the guide oil ring assembly 40 has a multi-segment structure, and the oil circuit matches the shape of the dual-motor structure, which is conducive to reducing the overall weight and size. Among them, the multiple oil injection ports 44 evenly distributed around the circumference on the front guide oil ring 41 can complete the cooling of the non-leading end of the motor stator. The rear guide oil ring 42 assembly 40 also relies on the circumferentially arranged oil injection ports 44 to achieve the cooling of the leading end of the motor stator.

[0086] In some implementations, see Figure 2 Within each oil guide ring assembly 40, multiple housing stator oil passages 43 are provided and arranged in a ring. The front oil guide ring 41, the multiple housing stator oil passages 43, and the rear oil guide ring 42 are connected in sequence and form a coaxial ring structure. In this way, the multiple housing stator oil passages 43 are provided to facilitate the flow of cooling oil between the front oil guide ring 41 and the rear oil guide ring 42, thereby improving cooling efficiency.

[0087] Example 2:

[0088] A transmission case is provided, including a transmission case housing with integrated cooling oil lines, and a dual motor assembly surrounded by the cooling oil lines.

[0089] Example 3:

[0090] A vehicle is provided, including a transmission housing with integrated cooling oil lines.

[0091] In this scheme: the first oil passage 10 includes a first oil passage body 11, a first middle branch 12, a second middle branch 13, a first end branch 14, and a second end branch 15; the second oil passage 20 includes a second oil passage body 21 and a first oil leak 22; the third oil passage 30 includes a third oil passage body 31, a first branch 32, a second branch 33, a first spray pipe 34, and a second spray pipe 35; the oil guide ring assembly 40 includes a front oil guide ring 41, a rear oil guide ring 42, a housing stator oil passage 43, and an oil spray port 44; wherein, the first oil passage body 11 is a columnar cavity structure; the first oil passage 10 is connected to the second oil passage body 21 through the first middle branch 12; the second middle branch 13 is connected to the third oil passage body 31; the first end branch 14 is connected to the front oil guide ring 41 of one oil guide ring assembly 40; and the second end branch 15 is connected to the front oil guide ring 41 of another oil guide ring assembly 40.

[0092] The two oil guide ring assemblies 40 are of different sizes to match the size of the dual-motor structure, which includes an engine and a drive motor. The second oil passage 20 communicates with the rear bearing chamber of the generator rotor shaft and the rear bearing chamber of the drive motor rotor shaft of the dual-motor sub-assembly, respectively. The oil passage arrangement in this scheme adopts a process in which the oil distribution plate is directly integrated into the housing, and the oil leakage hole is directly machined on the rear housing, which reduces the number of parts, reduces the assembly difficulty, and improves the integration of the entire design.

[0093] See Figure 1-4 The structure shown in the diagram is a cavity structure through which cooling oil flows within the transmission housing. In essence, the structure shown is a cavity structure through which cooling oil can flow. It should not be interpreted as a structure that can exist independently of the transmission housing. The cooling oil flow paths shown are all formed within the transmission housing, and all the cooling oil paths mentioned are integrally formed with the transmission housing by casting.

[0094] This application improves the integration of the transmission box, aligning with the development trend of lightweighting and miniaturization in new energy vehicles, while also reducing assembly difficulty. It reduces the structural complexity of the transmission box and the complexity of the oil circuit. The one-piece molding structure effectively reduces manufacturing and maintenance costs and minimizes safety issues such as oil leakage and heat dissipation failure caused by sealing or wear at the joints. Furthermore, the uniform distribution of oil channels ensures good cooling and lubrication uniformity within the transmission box, thereby avoiding the impact on transmission box efficiency, stability, and lifespan caused by uneven temperature distribution.

[0095] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0096] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0097] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 utility model according to the specific circumstances.

[0100] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0102] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A transmission case housing with an integrated cooling oil circuit, characterized in that: The transmission case housing and the cooling oil circuit are cast into an integrated structure, and the transmission case housing comprises a front housing, a middle housing and a rear housing which are connected in sequence; The cooling oil circuit comprises: A first oil passage (10), used for oil inlet of a cooling oil circuit and integrated on the middle housing; A second oil passage (20) integrated on the rear housing; A third oil passage (30) integrated on the front housing; The first oil passage (10) is connected to the second oil passage (20) and the third oil passage (30) at the same time.

2. The transmission case housing with integrated cooling oil circuit according to claim 1, characterized in that: The first oil passage (10) comprises: The first oil channel body (11) is a cylindrical cavity, one axial end of the first oil channel body (11) is connected to the oil inlet (50) of the cooling oil circuit, and the first oil channel body (11) is axially connected to a plurality of branches.

3. The transmission case housing with integrated cooling oil circuit according to claim 2, characterized in that: The first oil passage (10) further comprises: A first middle branch (12) for connecting the first oil channel body (11) and the second oil channel (20); A second middle branch (13) for connecting the first oil channel body (11) and the third oil channel (30); The first middle branch (12) and the second middle branch (13) are staggered in the axial direction of the first oil channel body (11) and extend in opposite radial directions.

4. The transmission case housing with integrated cooling oil circuit according to claim 1, characterized in that: The second oil passage (20) comprises: The second oil channel body (21) is in the shape of an elongated strip; A plurality of first oil leakage ports (22) are provided and are arranged at intervals along the length direction of the second oil channel body (21).

5. The transmission case housing with integrated cooling oil circuit according to claim 1, characterized in that: The third oil passage (30) comprises: The third oil channel body (31) is in the shape of an elongated strip; A first branch (32) connected to one end of the third oil channel body (31), the first branch (32) also being connected to a generator oil distribution plate (60); A second branch (33) connected to the other end of the third oil channel body (31), the end of the second branch (33) being connected to a drive motor oil distribution plate (70); The first spray pipe (34) is used for spraying oil and is connected to the middle part of the second branch (33).

6. The transmission case housing with integrated cooling oil circuit according to claim 1, characterized in that: The first oil passage (10) further comprises: A first end branch (14) and a second end branch (15), both of which are located at one end of the first oil passage (10), and the other end of the first oil passage (10) is used for oil intake; The cooling oil circuit also includes: Two axially parallel oil guide ring assemblies (40) are used to surround and cool the dual motor assembly, the first oil channel (10) is located between the two oil guide ring assemblies (40), and the two oil guide ring assemblies (40) are respectively connected to the first end branch (14) and the second end branch (15).

7. The transmission case housing with integrated cooling oil circuit according to claim 6, characterized in that: Each of the oil guide ring assemblies (40) comprises: A front oil guide ring (41) which is an annular cavity; A rear oil guide ring (42), which is coaxial with the front oil guide ring (41) and is spaced apart from each other; A housing stator oil passage (43) for connecting the front oil guide ring (41) and the rear oil guide ring (42); The oil injection port (44) is used for injecting oil, and the front oil guide ring (41) and the rear oil guide ring (42) are both provided with a plurality of oil injection ports (44) in a direction toward the center of the circle.

8. The transmission case housing with integrated cooling oil circuit according to claim 7, characterized in that: In each of the oil guide ring assemblies (40), the housing stator oil passages (43) are provided in plurality and arranged in an annular shape, and the front oil guide ring (41), the plurality of housing stator oil passages (43) and the rear oil guide ring (42) are sequentially connected to form a coaxial annular structure.

9. A transmission box, characterized in that: It comprises a transmission case housing with an integrated cooling oil circuit as described in any one of claims 1 to 8, and also comprises a dual motor assembly surrounded by the cooling oil circuit.

10. A vehicle, characterized in that: It comprises a transmission case housing integrated with a cooling oil circuit as described in any one of claims 1-8.

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