A dual-motor electric drive housing cooling system and electric drive device thereof

Abstract

The present application belongs to the technical field of electric drive devices, and provides a dual-motor electric drive housing cooling system and its electric drive device, including a motor housing, a first cooling circuit, a controller housing, and a second cooling circuit. In this solution, an avoidance space is formed on the motor housing, and the controller housing is arranged in the avoidance space, so that the structure of the entire dual-motor electric drive housing can be more compact and small in size, which is convenient for improving space utilization; and by setting the first cooling circuit, it is convenient to lubricate and cool the differential component and the first motor component in the motor housing, and by setting the second cooling circuit, it is possible to achieve heat exchange cooling of the electronic control component in the controller housing and the second motor component in the second motor housing, the overall integration is higher, and the external pipeline layout of the electric drive housing is also simpler and more convenient.

Description

Technical Field

[0001] The present application belongs to the technical field of electric drive devices, and specifically relates to a dual-motor electric drive housing cooling system and an electric drive device thereof. Background Art

[0002] In current electric drive systems, the motor and differential transmission mechanism are usually integrated in the same electric drive housing, so that the transmission distance from the motor to the differential transmission mechanism and then output by the differential transmission mechanism can be shortened, thereby reducing power loss during the transmission process; and with the integrated application of dual motors, the internal structure of the electric drive housing has become more complex.

[0003] In existing dual-motor electric drive systems, the two motors are of the same size, typically adopting a symmetrical layout, such as the common "T" configuration. However, in this configuration, the electric drive controller must be located on top of the electric drive housing. This significantly increases the Z-axis dimension of the entire system after molding, often requiring structural clearance at the vehicle end during installation. Furthermore, overall space utilization is low, and the integration level is limited. Summary of the Invention

[0004] In order to overcome at least one shortcoming of the above-mentioned prior art, the purpose of the present application is to provide a dual-motor electric drive housing cooling system and an electric drive device thereof.

[0005] The technical means adopted by this application to solve the above technical problems are:

[0006] The embodiment of the present application provides a dual-motor electric drive housing cooling system, comprising:

[0007] A motor housing, the motor housing comprising a differential housing, a first motor housing, and a second motor housing, the first motor housing and the second motor housing being mounted on either side of the differential housing, respectively; the volume of the first motor housing being larger than the volume of the second motor housing, and the top of the first motor housing being higher than the top of the second motor housing to form an escape space;

[0008] a first cooling circuit comprising a first liquid inlet provided on the motor housing, a differential cooling branch pipe for spraying water inside the differential cooling housing, a motor cooling branch pipe for spraying water inside the first motor housing, an oil pump mounting portion provided on the motor housing, and a first liquid outlet, the differential cooling branch pipe and the motor cooling branch pipe being in communication with the first liquid inlet, the oil pump mounting portion comprising a first access port in communication with a bottom portion of an inner cavity of the motor housing, and a second access port in communication with the first liquid outlet;

[0009] A controller housing is arranged in the avoidance space;

[0010] The second cooling circuit includes a second liquid inlet, an electronically controlled cooling cavity, and a second liquid outlet arranged on the controller housing; a third liquid inlet, a motor cooling cavity, and a third liquid outlet arranged on the second motor housing; and the second liquid outlet is connected to the third liquid inlet.

[0011] In some embodiments, the first liquid inlet and the first liquid outlet are arranged side by side, and an oil cooler is connected to the first liquid inlet and the first liquid outlet.

[0012] In some embodiments, the differential cooling branch pipe includes a first branch pipe, one end of the first branch pipe is connected to the first liquid inlet and is located above the output shaft assembly in the motor housing, and the other end of the first branch pipe extends and is disposed above the intermediate shaft assembly in the motor housing;

[0013] The first branch pipe is provided with spray holes respectively facing the output shaft assembly, the intermediate shaft assembly and the first input shaft assembly arranged in the motor housing.

[0014] In some embodiments, the differential cooling branch pipe includes a second branch pipe, the second branch pipe is arranged across between the first motor housing and the differential housing and is located above the intermediate shaft assembly;

[0015] The second branch pipe is provided with a first bypass pipe section and a second bypass pipe section. The first bypass pipe section is provided with a spray hole toward the output shaft assembly, and the second bypass pipe section is provided with spray holes toward the first input shaft assembly and the second input shaft assembly arranged in the motor housing.

[0016] In some embodiments, the differential cooling branch pipe includes a third branch pipe, the third branch pipe is arranged across between the first motor housing and the differential housing and is located above the second input shaft assembly;

[0017] The third branch pipe is provided with a spray hole facing the first input shaft assembly, and the first input shaft assembly is located above the second input shaft assembly.

[0018] In some embodiments, a first motor assembly is disposed in the first motor housing, and a plurality of the motor cooling branches are disposed transversely above the first motor assembly;

[0019] The motor cooling branch pipe is provided with a spray hole facing the first motor component.

[0020] In some embodiments, an oil retaining sleeve is provided at the bottom of the motor housing, and a plurality of contoured grooves are provided on the oil retaining sleeve corresponding to the transmission gear in the motor housing, and the transmission gear is partially disposed in the contoured grooves;

[0021] An oil unloading hole is provided at the bottom of the contoured groove.

[0022] In some embodiments, an oil pump assembly is provided at the oil pump mounting portion, and the oil pump assembly is connected to the first inlet and the second inlet.

[0023] In some embodiments, the electrically controlled cooling cavity includes a first cooling cavity and a second cooling cavity, and the first cooling cavity and the second cooling cavity are arranged side by side and communicated with each other;

[0024] A wiring area is formed between the first cooling cavity and the second cooling cavity.

[0025] In addition, the present application also provides an electric drive device, in which the dual-motor electric drive housing cooling system as described above is provided.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] In the present application, the first motor housing and the second motor housing of different volumes are staggered to form the avoidance space, and the controller housing is arranged in the avoidance space, so that the structure of the entire dual-motor electric drive housing can be more compact and small in volume, which is convenient for improving space utilization; and the first cooling circuit is arranged to facilitate lubrication and cooling of the differential component in the motor housing and the first motor component in the first motor housing, and the second cooling circuit is arranged to achieve heat exchange cooling of the electronic control component in the controller housing and the second motor component in the second motor housing, the overall integration is higher, and the external pipeline layout of the electric drive housing is also simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of a dual-motor electric drive housing according to one example of this application.

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of a dual-motor electric drive housing according to one example of this application.

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of a dual-motor electric drive housing according to one example of this application.

[0032] Figure 4This is a schematic diagram of the three-dimensional structure of a dual-motor electric drive housing according to one example of this application.

[0033] Figure 5 This is a schematic diagram of the front view of the dual-motor electric drive housing according to one example of the present application.

[0034] Figure 6 This is a schematic diagram of the location of the avoidance space in one example of this application.

[0035] Figure 7 This is a schematic diagram of an application of a subtraction component in one example of this application.

[0036] Figure 8 This is a schematic diagram of the inner structure of the first motor housing according to one example of the present application.

[0037] Figure 9 This is a schematic diagram of the outer structure of the first motor housing in one example of this application.

[0038] Figure 10 This is a schematic diagram of the inner structure of an example lower differential housing of this application.

[0039] Figure 11 This is a schematic diagram of the outer structure of an example of a lower differential housing in this application.

[0040] Figure 12 This is a structural diagram of an example lower oil retaining sleeve of this application.

[0041] Figure 13 This is a schematic diagram of the installation of the electronic control module in one example of this application.

[0042] Figure 14 This is a schematic diagram of the position of the electronically controlled cooling chamber in one example of this application.

[0043] Marking Description:

[0044] 1-motor housing, 11-differential reduction housing, 111-first branch pipe, 112-second branch pipe, 1121-first bypass pipe section, 1122-second bypass pipe section, 11221-first spray hole, 11222-second spray hole, 11223-third spray hole, 113-third branch pipe, 12-first motor housing, 121-first liquid inlet, 122-motor cooling branch pipe, 123-first liquid outlet, 124-outer cover, 13-second motor housing, 131-third liquid inlet, 132-third liquid outlet, 14-avoidance space, 15-oil pump mounting portion, 151-first access port, 152-second access port;

[0045] 2-controller housing, 21-second liquid inlet, 22-second liquid outlet, 23-electronic control module, 241-first cooling chamber, 242-second cooling chamber, 243-wiring connection area;

[0046] 3-differential assembly, 31-first input shaft assembly, 32-second input shaft assembly, 33-intermediate shaft assembly, 34-output shaft assembly;

[0047] 4-Oil cooler;

[0048] 5-oil retaining sleeve, 51-profile groove, 52-oil unloading hole;

[0049] 6-Oil pump assembly. DETAILED DESCRIPTION

[0050] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0051] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. Similar reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. At the same time, in the description of this application, the terms "first", "second", etc. are used only to distinguish descriptions and are not to be understood as indicating or implying relative importance.

[0052] like Figures 1 to 14 As shown, this embodiment provides a dual-motor electric drive housing cooling system, including:

[0053] The motor housing 1 includes a differential housing 11, a first motor housing 12, and a second motor housing 13. The first motor housing 12 and the second motor housing 13 are respectively mounted on both sides of the differential housing 11. The volume of the first motor housing 12 is larger than the volume of the second motor housing 13, and the top of the first motor housing 12 is higher than the top of the second motor housing 13 to form an avoidance space 14.

[0054] A first cooling circuit includes a first liquid inlet 121 provided on the motor housing 1, a differential cooling branch pipe for spraying the interior of the differential housing 11, a motor cooling branch pipe 122 for spraying the interior of the first motor housing 12, an oil pump mounting portion 15 provided on the motor housing 1, and a first liquid outlet 123. The differential cooling branch pipe and the motor cooling branch pipe 122 are in communication with the first liquid inlet 121. The oil pump mounting portion 15 includes a first access port 151 in communication with the bottom of the inner cavity of the motor housing 1, and a second access port 152 in communication with the first liquid outlet 123.

[0055] The controller housing 2 is arranged in the avoidance space 14;

[0056] The second cooling circuit includes a second liquid inlet 21, an electronically controlled cooling cavity, and a second liquid outlet 22 provided on the controller housing 2, and a third liquid inlet 131, a motor cooling cavity, and a third liquid outlet 132 provided on the second motor housing 13. The second liquid outlet is connected to the third liquid inlet.

[0057] In some embodiments, the differential housing 11 and the first motor housing 12 are installed to form an internal space, which is used for the installation of the differential assembly 3; wherein, with reference to Figure 7 As shown, based on the dual-motor drive structure, the differential subtraction assembly 3 includes a first input shaft assembly 31, a second input shaft assembly 32, an intermediate shaft assembly 33 and an output shaft assembly 34. The first input shaft assembly 31, the second input shaft assembly 32, the intermediate shaft assembly 33 and the output shaft assembly 34 each include their corresponding rotating shafts, transmission gears arranged on the rotating shafts, bearings arranged at both ends of the rotating shafts, etc.

[0058] The specific structural form of the differential subtraction component 3 can be referred to the existing technology and will not be described here in detail.

[0059] In some embodiments, a first motor assembly is disposed within the first motor housing 12, and a second motor assembly is disposed within the second motor housing 13. The first motor assembly is transmission-connected to the first input shaft assembly 31 to facilitate power output, while the second motor assembly is transmission-connected to the second input shaft assembly 32 to facilitate power output. The first and second motor assemblies each include a rotor, a stator, and corresponding rotating shafts, bearings, and the like.

[0060] The specific structural forms of the first motor assembly and the second motor assembly can also refer to the existing technology and will not be described here in detail.

[0061] In some embodiments, the volume of the first motor housing 12 is greater than the volume of the second motor housing 13 , which can also be understood as the volume of the first motor assembly being greater than the volume of the second motor assembly, or the power of the first motor assembly being greater than the power of the second motor assembly.

[0062] In some embodiments, as Figure 5 、 Figure 6 As shown, after the first motor housing 12 and the second motor housing 13 are installed on the differential housing 11, the bottom of the second motor housing 13 is almost flush with the bottoms of the differential housing 11 and the first motor housing 12, and the avoidance space 14 is formed between the top of the second motor housing 13 and the top of the first motor housing 12, and then the controller housing 2 is arranged in the avoidance space 14; and the top of the controller housing 2 after installation is almost flush with the top of the first motor housing 12.

[0063] Under this structural form, the center of mass of the dual-motor electric drive housing is still in the middle position, and the volume difference between the first motor housing 12 and the second motor housing 13 is fully utilized, which facilitates improving the integration of the dual-motor electric drive housing and higher space utilization.

[0064] In some embodiments, the first cooling circuit adopts oil cooling. At this time, the cooling lubricating oil is input from the first liquid inlet 121, and is output from the differential cooling branch and the motor cooling branch 122 through the internal pipeline of the first motor housing 12, thereby lubricating and cooling the differential component 3 and the first motor component respectively. After lubrication and cooling, the cooling lubricating oil is temporarily stored at the bottom of the inner cavity of the motor housing 1, and then the cooling lubricating oil stored at the bottom of the inner cavity of the motor housing 1 is transported to the first liquid outlet 123 through the first access port 151 and the second access port 152, thereby realizing the circulation of the cooling lubricating oil in the first cooling circuit.

[0065] In some embodiments, the second cooling circuit adopts water cooling. At this time, the coolant is input from the second liquid inlet 21, and then passes through the electronic control cooling cavity to perform heat exchange cooling on the electronic control module 23 in the controller housing 2, and then is transported to the motor cooling cavity in the second motor housing 13 through the second liquid outlet 22 and the third liquid inlet 131, thereby performing heat exchange cooling on the second motor assembly, and then is output from the third liquid outlet 132, thereby realizing the circulation of the coolant in the second cooling circuit.

[0066] By setting up the first cooling circuit and the second cooling circuit, it is possible to facilitate the separate implementation of oil cooling and water cooling, thereby improving the cooling heat exchange and cooling lubrication effects of the dual-motor electric drive housing, and the overall integration is high; moreover, the controller housing 2 and the second motor housing 13 can share the same cooling circuit, the layout design is more reasonable, and it is convenient to optimize the pipeline connection. For example, the transfer length of the pipeline can be reduced, so that the layout design of the external pipeline can be more organized.

[0067] As an example of one application, Figure 1 、 Figure 2 As shown, the first liquid inlet 121 and the first liquid outlet 123 are arranged side by side, and the oil cooler 4 is connected to the first liquid inlet 121 and the first liquid outlet 123.

[0068] In some embodiments, the first liquid inlet 121 and the first liquid outlet 123 are disposed on the first motor housing 12, and the oil cooler 4 is mounted on the first motor housing 12. The oil cooler 4 is in communication with the first liquid inlet 121 and the first liquid outlet 122, respectively, so that the cooling lubricating oil can be cooled by the oil cooler 4 during circulation, thereby improving the lubrication and cooling effect.

[0069] As an example of one application, Figure 7 、 Figure 8 As shown, the differential cooling branch pipe includes a first branch pipe 111, one end of the first branch pipe 111 is connected to the first liquid inlet 121 and is located above the output shaft assembly 34 in the motor housing 1, and the other end of the first branch pipe 111 extends above the intermediate shaft assembly 33 in the motor housing 1;

[0070] The first branch pipe 111 is provided with spray holes respectively facing the output shaft assembly 34 , the intermediate shaft assembly 33 and the first input shaft assembly 31 disposed in the motor housing 1 .

[0071] In some embodiments, as Figure 8 As shown, the first branch pipe 111 is plugged and installed on the inner side of the first motor housing 12, and is connected to the first liquid inlet 121 through the internal pipeline of the first motor housing 12; a plurality of spray holes are provided on the outer peripheral surface of the first branch pipe 111 to spray cooling lubricating oil on the differential cage of the output shaft assembly 34, the left bearing of the output shaft, the left bearing of the first input shaft assembly 31, the pinion of the intermediate shaft assembly 33, and the right bearing of the intermediate shaft assembly 33 respectively.

[0072] Among them, the "left" and "right" mentioned in this embodiment refer to the side where the first motor housing 12 is located as "left", and the side where the second motor housing 13 is located as "right". The "left" and "right" mentioned here are intended to distinguish the installation orientations of paired components such as bearings, and are not intended to limit the installation positions of related components or the orientation of the installation position of the motor housing 1.

[0073] In some embodiments, the differential subtraction assembly 3 further includes a synchronizer, and the first branch pipe 111 is also provided with the spray hole for spraying cooling lubricating oil to the synchronizer.

[0074] As an example of one application, Figure 8 、 Figure 10 、 Figure 11 As shown, the differential cooling branch pipe includes a second branch pipe 112 , which is arranged across between the first motor housing 12 and the differential housing 11 and is located above the intermediate shaft assembly 33 ;

[0075] The second branch pipe 112 is provided with a first bypass pipe section 1121 and a second bypass pipe section 1122. The first bypass pipe section 1121 is provided with a spray hole toward the output shaft assembly 34, and the second bypass pipe section 1122 is provided with spray holes toward the first input shaft assembly 31 and the second input shaft assembly 32 arranged in the motor housing 1.

[0076] In some embodiments, one end of the second branch pipe 112 is inserted into the inner side of the first motor housing 12 , and the other end is inserted into the inner side of the differential housing 11 , thereby connecting the internal pipe of the first motor housing 12 with the internal pipe of the differential housing 11 .

[0077] In some embodiments, as Figure 11 As shown, the first bypass pipe section 1121 is arranged in the differential housing 11; one end of the first bypass pipe section 1121 is connected to the second branch pipe 112, and the other end extends toward the output shaft assembly 34, and a spray hole is provided on the first bypass pipe section 1121 to spray lubricating oil on the right bearing of the output shaft assembly 34.

[0078] In some embodiments, as Figure 10 、 Figure 11As shown, the second bypass pipe section 1122 is disposed within the differential housing 11; one end of the second bypass pipe section 1122 communicates with the second branch pipe 112, and the other end communicates with the right bearing mounting location of the first input shaft assembly 31. A first spray hole 11221, a second spray hole 11222, and a third spray hole 11223 are formed at the end of the second bypass pipe section 1122 to spray lubricating oil onto the interior of the rotating shaft of the first input shaft assembly 31, the left bearing of the second input shaft assembly 32, and the right bearing of the first input shaft assembly 31, respectively.

[0079] As an application example, the differential cooling branch pipe includes a third branch pipe 113 , which is arranged across between the first motor housing 12 and the differential housing 11 and is located above the second input shaft assembly 32 ;

[0080] The third branch pipe 113 is provided with a spray hole facing the first input shaft assembly 31 . The first input shaft assembly 31 is located above the second input shaft assembly 32 .

[0081] In some embodiments, the spray hole is provided on the third branch pipe 113 facing the transmission gear and synchronizer of the first input shaft assembly 31. Since the first input shaft assembly 31 is located above the second input shaft assembly 32, the lubricating cooling oil sprayed can also act on the second input shaft assembly 32.

[0082] As an example of one application, Figure 9 As shown, the first motor housing 12 is provided with the first motor assembly, and a plurality of the motor cooling branches 122 are arranged across the top of the first motor assembly;

[0083] The motor cooling branch pipe 122 is provided with a spray hole facing the first motor component.

[0084] In some embodiments, referring to FIG9 , three motor cooling branches 122 are provided. One end of each motor cooling branch 122 is plugged into and communicates with the first motor housing 12, and the other end extends toward an outer cover 124 of the first motor housing 12. The motor cooling branch 122 is provided with spray holes corresponding to the end windings, left bearing, and stator of the first motor assembly.

[0085] In some embodiments, one of the motor cooling branches 122 is in communication with the outer cover 124 , thereby delivering lubricating cooling oil to the interior of the rotating shaft of the first motor assembly through an internal pipe of the outer cover 124 .

[0086] As an example of one application, Figure 7 、 Figure 12As shown, an oil retaining sleeve 5 is provided at the bottom of the inner cavity of the motor housing 1, and a plurality of contoured grooves 51 are provided on the oil retaining sleeve 5 corresponding to the transmission gear in the motor housing 1, and the transmission gear portion is disposed in the contoured grooves 51;

[0087] An oil discharge hole 52 is provided at the bottom of the contoured groove 51 .

[0088] In some embodiments, the oil deflector sleeve 5 is provided with contoured grooves 51 corresponding to the two transmission gears of the intermediate shaft assembly 33 and the transmission gear of the output shaft assembly 34. The contoured grooves 51 can reduce oil churning losses and heating in the system, thereby improving cooling and lubrication. Oil can then be discharged through the oil discharge holes 52 to the bottom of the inner cavity of the motor housing 1, preventing oil sedimentation.

[0089] As an example of one application, Figure 1 、 Figure 2 As shown, an oil pump assembly 6 is provided at the oil pump mounting portion 15 , and the oil pump assembly 6 is connected to the first inlet 151 and the second inlet 152 .

[0090] In some embodiments, a suction filter is provided at the bottom of the inner cavity of the motor housing 1, and the output end of the suction filter is connected to the first inlet 151. The structure of the suction filter can be referred to in the prior art and will not be described in detail here.

[0091] In some embodiments, the second inlet 152 is connected to the first liquid outlet 123 through an internal pipe of the first motor housing 12 .

[0092] The oil pump assembly 6 can deliver the cooling lubricating oil sucked from the first inlet 151 to the first liquid outlet 123 through the second inlet 152 .

[0093] As an example of one application, Figure 13 、 Figure 14 As shown, the electrically controlled cooling cavity includes a first cooling cavity 241 and a second cooling cavity 242. The first cooling cavity 241 and the second cooling cavity 242 are arranged side by side and communicate with each other.

[0094] A wiring area 243 is formed between the first cooling cavity 241 and the second cooling cavity 242 .

[0095] In some embodiments, the first cooling cavity 241 and the second cooling cavity 242 are used to perform heat exchange cooling on the electronic control module 23 of the first motor assembly and the electronic control module 23 of the second motor assembly, respectively, so that the corresponding electronic control module 23 can be in better application environment conditions.

[0096] The structure of the electric control module 23 can be found in the prior art and will not be described in detail here.

[0097] By forming the busbar connection area 243 between the first cooling cavity 241 and the second cooling cavity 242 , the busbar connection area 243 can also be placed under more suitable temperature conditions, thereby reducing the heat generation effect at the copper busbar connection and improving application safety.

[0098] In addition, this embodiment also provides an electric drive device, in which the dual-motor electric drive housing cooling system as described above is provided.

[0099] In some embodiments, the electric drive device is used in transportation equipment.

[0100] The above description is only a specific implementation method of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should also be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0101] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A dual-motor electric drive housing cooling system, characterized in that: include: A motor housing, the motor housing comprising a differential housing, a first motor housing, and a second motor housing, the first motor housing and the second motor housing being mounted on either side of the differential housing, respectively; the volume of the first motor housing being larger than the volume of the second motor housing, and the top of the first motor housing being higher than the top of the second motor housing to form an escape space; a first cooling circuit comprising a first liquid inlet provided on the motor housing, a differential cooling branch pipe for spraying water inside the differential cooling housing, a motor cooling branch pipe for spraying water inside the first motor housing, an oil pump mounting portion provided on the motor housing, and a first liquid outlet, the differential cooling branch pipe and the motor cooling branch pipe being in communication with the first liquid inlet, the oil pump mounting portion comprising a first access port in communication with a bottom portion of an inner cavity of the motor housing, and a second access port in communication with the first liquid outlet; A controller housing is arranged in the avoidance space; The second cooling circuit includes a second liquid inlet, an electronically controlled cooling cavity, and a second liquid outlet arranged on the controller housing; a third liquid inlet, a motor cooling cavity, and a third liquid outlet arranged on the second motor housing; and the second liquid outlet is connected to the third liquid inlet.

2. The dual-motor electric drive housing cooling system according to claim 1, characterized in that: The first liquid inlet and the first liquid outlet are arranged side by side, and an oil cooler is connected to the first liquid inlet and the first liquid outlet.

3. The dual-motor electric drive housing cooling system according to claim 1 or 2, characterized in that: The differential cooling branch pipe includes a first branch pipe, one end of which is connected to the first liquid inlet and is located above the output shaft assembly in the motor housing, and the other end of which extends above the intermediate shaft assembly in the motor housing; The first branch pipe is provided with spray holes respectively facing the output shaft assembly, the intermediate shaft assembly and the first input shaft assembly arranged in the motor housing.

4. The dual-motor electric drive housing cooling system according to claim 3, characterized in that: The differential cooling branch pipe includes a second branch pipe, the second branch pipe is arranged across between the first motor housing and the differential housing and is located above the intermediate shaft assembly; The second branch pipe is provided with a first bypass pipe section and a second bypass pipe section. The first bypass pipe section is provided with a spray hole toward the output shaft assembly, and the second bypass pipe section is provided with spray holes toward the first input shaft assembly and the second input shaft assembly arranged in the motor housing.

5. The dual-motor electric drive housing cooling system according to claim 4, characterized in that: The differential cooling branch pipe includes a third branch pipe, the third branch pipe is arranged across between the first motor housing and the differential housing and is located above the second input shaft assembly; The third branch pipe is provided with a spray hole facing the first input shaft assembly, and the first input shaft assembly is located above the second input shaft assembly.

6. The dual-motor electric drive housing cooling system according to claim 1 or 5, characterized in that: A first motor assembly is disposed in the first motor housing, and a plurality of motor cooling branches are disposed transversely above the first motor assembly; The motor cooling branch pipe is provided with a spray hole facing the first motor component.

7. The dual-motor electric drive housing cooling system according to claim 6, characterized in that: An oil retaining sleeve is provided at the bottom of the motor housing, and a plurality of contoured grooves are provided on the oil retaining sleeve corresponding to the transmission gear in the motor housing, and the transmission gear is partially arranged in the contoured grooves; The bottom of the contoured groove is provided with an oil unloading hole.

8. The dual-motor electric drive housing cooling system according to claim 7, characterized in that: An oil pump assembly is provided at the oil pump mounting portion, and the oil pump assembly is connected to the first inlet and the second inlet.

9. The dual-motor electric drive housing cooling system according to claim 1 or 8, characterized in that: The electrically controlled cooling cavity comprises a first cooling cavity and a second cooling cavity, wherein the first cooling cavity and the second cooling cavity are arranged side by side and communicate with each other; A wiring area is formed between the first cooling cavity and the second cooling cavity.

10. An electric drive device, characterized in that: The electric drive device is provided with a dual-motor electric drive housing cooling system as described in any one of claims 1 to 9.

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